• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Control method of a three-phase DC/AC electronic converter with one phase failure. A control method of a three-phase electronic DC/AC converter connected to an electrical network is disclosed, in which one or two switches of the same phase are damaged. The converter has an input voltage (Vcc) and an output voltage vector ((vector v)ref) whose possible vectors before the fault define a hexagon and then of the fault define a rhombus. The method comprises reconstructing and stabilizing a hexagon formed by six space vectors at 60º from the four space vectors available after the breakdown, which allows the converter output vector to be modulated using a conventional "SVM" space vector modulator ((vector v)ref). The method takes into account the voltage variations in the DC bus of the electronic converter to stabilize the regular hexagon. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2735639A1
    申请号:ES201930835
    申请日:2019-09-27
    公开日:2019-12-19
    发明作者:Prieto Dionisio Ramirez；Zarei Mohammad Ebrahim；Rodrigo Fernando Martinez；De Lucas Luis Carlos Herrero
    申请人:Universidad Politecnica de Madrid；Universidad de Valladolid；
    IPC主号:
    专利说明:

    [0001]
    [0002]
    [0003]
    [0004] Object of the invention
    [0005]
    [0006] The object of the present invention is to control the output vectors of a DC / AC converter where there has been a failure of a switch or two switches in the same phase of the converter. This allows to continue pouring power from the converter to the AC network to which it is connected. For this, the method of the present invention reconstructs and stabilizes the spatial vectors to form a regular hexagon, allowing to continue using an "SVM" Space Vector Modulator (six vectors forming a regular hexagon) of the prior art.
    [0007]
    [0008] Therefore, the present invention solves the technical problem of allowing to continue using, exchanging power with the network, an electronic DC / AC converter connected to the network in which one or two switches of the same phase are in failure.
    [0009]
    [0010] The present invention therefore relates to the field of power electronics, and more specifically to the sector of the technique dedicated to electronic converters for the conversion between direct current and alternating current.
    [0011]
    [0012] Background of the invention
    [0013]
    [0014] Although there are several methods already known in the state of the art for the control of an electronic DC / AC converter as disclosed in "Kai Ni, Yihua Hu, Yang Liu, and Chun Gan. Performance Analysis of a Four-Switch Three-Phase Grid-Side Converter with Modulation Simplification in a Doubly-Fed Induction Generator-Based Wind Turbine ( DFIG-WT) with Different External Disturbances. Energies 2017, 10, 706; doi: 10.3390 / en10050706 ", the present invention provides a method that facilitates the generation of tension by spatial vectors. Indeed, after the breakdown, the converter can only generate four spatial vectors instead of six, and in addition the four spatial vectors are unstable in position and module. This instability is a problem to perform the modulation since it is essential to know the quadrant or sector where the vector to be reproduced by modulation is found, vref, to correctly choose the modulating vectors. If the quadrants of Figure 6 are unstable, it becomes more complex to obtain the quadrant in which the vector v ref is located.
    [0015]
    [0016] In addition, performing a vref modulation with four unstable vectors requires a new philosophy different from that of a conventional SVM, which is more complex for the programmer of the electronic converter control system.
    [0017]
    [0018] Description of the invention
    [0019]
    [0020] The present invention relates to a control method of a single phase DC / AC electronic converter, where the three phase DC / AC electronic converter is connected to the network to exchange electrical power with the network. The fault in the phase can be of a switch or of two switches.
    [0021]
    [0022] Through this invention, six spatial vectors are again available with a stable position (modulated from the four generable ones), which is essential for choosing the vectors with which to perform the modulation. It also makes it easier for the converter control programmer to use the software before the breakdown, with minor modifications and maintaining the philosophy of a classic SVM modulator with six hexagon vectors (see Figure 8 ). In reality, the programmer will superimpose two modulations: a modulation to generate (V , % ,,%,%, V¡ and Vg) from (F00, V10, V1: L, V01) and another modulation, that of a Classic SVM, to generate vref from (V *, V 2 , %, V 3 V and Vg).
    [0023]
    [0024] In a very short way, the present invention consists in reconstructing and stabilizing the hexagon of figure 1 from the rhombuses of figure 5 and figure 6 according to the method of the present invention. Once the hexagon has been reconstructed, with a constant 60 ° angles (see figure 7) a conventional spatial vector modulator (SVM) can be used, although it is true that the resulting spatial vectors (Vi, V *, V 3 , V 3 V 3 and Vg) have a module smaller than those in figure 1 (before the breakdown).
    [0025] The control method of a three-phase DC / AC electronic converter with one phase failure of the present invention is directed to a three-phase DC / AC electronic converter comprising a direct current bus formed by at least two capacitors "C1" and "C2 "In series. The control method of a three-phase electronic DC / AC converter with one phase failure of the present invention comprises:
    [0026] - connect the fault phase of at least one switch with the midpoint of the DC bus formed between capacitors C1 and C2;
    [0027] - measure voltage vectors V 00, V 01 , V 10 and F1: L, generated by the three-phase DC / AC converter when the three-phase DC / AC electronic converter has a fault of at least one switch in the same phase;
    [0028] - calculate a voltage vector V by applying the voltage vector F00 during the% of the period defined as d Voo;
    [0029] - calculate a voltage vector V 2 by applying the voltage vector V 00 during the% of the period defined as d Voo and the voltage vector V 10 during the% of the period defined as d v1o;
    [0030] - calculate a voltage vector V 3 by applying the voltage vector F10 during the% of the period defined as d Vio and the voltage vector í ^ 11 during the% of the period defined as d v11;
    [0031] - calculate a voltage vector V4 by applying the voltage vector
    [0032] - calculate a voltage vector V 5 by applying the voltage vector í 1 ^ 1 during the% of the period defined as d Vi and the voltage vector V 01 during the% of the period defined as d Voi;
    [0033] - calculate a voltage vector V 6 by applying the voltage vector V 01 during the% of the period defined as d Voi and the voltage vector V 00 during the% of the period defined as d Voo;
    [0034] - reconstruct a hexagon formed by vectors
    [0035] - perform a modulation of the vre / like vector
    [0036]
    [0037] v re / _ V fc "^ fc ^ V fc + 1 " ^ fc + 1 + 0 ■ ^ vo
    [0038] for k = 1, 2, 3, 4 5 and 6, where
    [0039]
    [0040] To perform the modulation of the vre / vector, the method of the present invention discriminates between two types of situations:
    [0041] A) vcl = vc2 = Vcc / 2
    [0042] B) v # i 'v # 2' V% c & 2
    [0043]
    [0044] Situation A): vcl _ vc2 _ Vcc / 2
    [0045]
    [0046] In this case, the method of the present invention additionally comprises:
    [0047] - limit the module of the üre / vector to a maximum value:
    [0048] _ Vcc / 2
    [0049] ^ re / max ^ 3
    [0050]
    [0051] - maintain the phase of vectors V *, %,%, V ^ V2 and V located exactly at 0o, 60o, 120o, 180o, 240o, 300o and 360o by calculating the duty cycles
    [0052]
    [0053] - carry out a spatial vector modulation stage, SVM, by means of an SVM spatial vector modulator, which calculates the duty cycles dyi, dy2, dy3, dVAldVs> dy6 that give rise to üre / from V'2, V2, V'2, V *, V2 and V (once located exactly at 0o, 60o, 120o, 180o, 240o, 300o and 360o) according to Table 1, giving rise to new global duty cycles , Dyk, D ^ k + i, which are the result of composing the two modulations (the first modulation places the vectors exactly at 0 °, 60 °, 120 °, etc .; the second modulation uses these vectors already located correctly, to generate vref by modulation).
    [0054]
    [0055]
    [0056] Table 1
    [0057] Situation B) v cl 'vc2' V cc / 2:
    [0058] In this case, the method of the present invention additionally comprises:
    [0059] - limit the module of vector v ref to a maximum value:
    [0060]
    [0061]
    [0062] - keep the phase of the %,%, V *, V5 and 'vectors exactly at 0 o , 60 o , 120 o , 180 o , 240 o , 300 o and 360 or by calculating the duty cycles that appear in Table 2:
    [0063]
    [0064]
    [0065]
    [0066] Table 2
    [0067] where dVoo, dVoi, dVw, dv ± i are calculated according to table 3:
    [0068]
    [0069] Table 3
    [0070] Y,
    [0071] carry out a stage of spatial vector modulation, SVM, by means of an SVM spatial vector modulator, which calculates duty cycles dVl>dV2>dV3> dV4, dVs, dVg that give rise to vref from V *, V2, V3, %, V2 and V2 (once located exactly at 0o, 60o, 120o, 180o, 240o, 300o and 360o).
    [0072]
    [0073] Description of the figures
    [0074]
    [0075] In order to help a better understanding of the features of the invention according to a preferred example of practical realization thereof, and to complement this description, the following figures are attached as an integral part thereof, the character of which is illustrative and non-limiting:
    [0076]
    [0077] Figure 1 shows the hexagon defining the spatial vectors that a three-phase electronic DC / AC converter is capable of generating in alternating current and the maximum radius if it is desired to generate a balanced three-phase voltage without distortions.
    [0078]
    [0079] Figure 2 represents a three-phase DC / AC electronic converter connected to a three-phase electrical network. The converter has three triacs that are used to connect the phase where it has been a fault occurred, to the midpoint of the DC bus capacitors.
    [0080]
    [0081] Figure 3 shows the electronic converter after a fault occurs in Sa and / or S’a, showing phase a of the network connected to the midpoint of the DC bus capacitors.
    [0082]
    [0083] Figure 4 shows the four possible combinations of open / closed switches and the corresponding connection of the capacitors to the network.
    [0084]
    [0085] Figure 5 shows the four space vectors ( Foo- ^ oi- ^ io . ^ Ii ) that the electronic converter is able to generate after the fault and with the affected phase connected to the midpoint of the DC bus capacitors. The maximum radius for the vector also appears
    [0086] Vref
    [0087]
    [0088] Figure 6 shows how the angle and modulus of the spatial vectors change ( V 00 'V 01 ' V 10 > ^ u) when the capacitor voltage is not constant. The maximum radius for the vector v ref also appears, which is defined by the smaller one between v c1 and v c2 .
    [0089]
    [0090] Figure 7 shows the original hexagon before the breakdown, whose vectors appear in broken lines, and the hexagon available after the breakdown (smaller). Also available are the vectors available after the breakdown ( í ^ 00 , í ^ 01 , í 1 ^ 0 , í 1 ^ 1 ) and the vectors ( í7 1 , v 2 , í7 3 , í74, í 5 , í 6 ) to be reconstructed by modulation to rebuild and stabilize the hexagon.
    [0091]
    [0092] Figure 8-a represents the SVM module that performs spatial vector modulation, before the breakdown. Where the inputs are the aP coordinates of the vector to be modulated, v ref , and the voltage value on the DC bus of the electronic converter, VCC. The outputs are duty cycles dv . and dv . + i of the vectors V- and F j + 1 calculated to modulate v ref in each sector of the hexagon.
    [0093]
    [0094] Figures Figure 8-ba Figure 8-g show, for vc1 = vc2 = VCC / 2 and for each sector of the hexagon, how to combine the outputs of the conventional SVM module (before the fault) to, after the fault, obtain the duty cycles ( “duty oyeles”) according to the invention. In all six cases, the DC voltage input is, after the fault, VCC / 2.
    [0095]
    [0096] Figure 9 shows how the area of the hexagon changes as the voltage in the capacitors changes. The cases of major and minor area corresponding to the maximum and minimum values of vcl and vc2 have been represented.
    [0097]
    [0098] Preferred Embodiment of the Invention
    [0099]
    [0100] List of references:
    [0101]
    [0102] 1. Three-phase DC / AC electronic converter;
    [0103] 2. Sa switch; two'. S’a switch;
    [0104] 3. Sb switch; 3'. S’b switch;
    [0105] 4. Sc switch; 4'. S’c switch;
    [0106] 5. C1 condenser; 5'. C2 condenser;
    [0107] 6. Intermediate point between capacitor C1 and capacitor C2;
    [0108] 7. Triac of phase "a"; 7 ’. Triac of phase "b"; 7 ’. Triac of the "c" phase;
    [0109] 8. Spatial Vector Modulator “SVM”;
    [0110] 9. Hexagon; 9 ’. Minimum hexagon; 9 ’. Maximum hexagon; 9 ’’. Hexagon pre-failure; 9 ’’ ’.
    [0111] Post-fault hexagon;
    [0112] 10. Vref; 10 ’. circumference generated by vref;
    [0113] 11. Rhombus.
    [0114]
    [0115] The present invention relates to a control method of a three-phase DC / AC electronic converter (1) with one phase failure (a, b, c), where the three-phase DC / AC electronic converter is connected to the network to exchange power electric with the network. The failure in the phase can be of a switch or two switches (2 and 2 ’in figure 3).
    [0116]
    [0117] As is known, a three-phase electronic DC / AC converter (1) is normally controlled using vector control. Using this control theory, the converter output voltage can be represented by six active space vectors (% *, v £, V3,% *,% and V3) and two nulls (%), which give rise to a hexagon (9 ) like the one in Figure 1 that correspond to the driving and blocking states of the six switches (Sa, Sb, Sc, S'a, S'b, S'c) that make up the electronic converter (see Figure 2).
    [0118]
    [0119] To generate a three-phase voltage, the three-phase electronic DC / AC converter (1) must rotate the space vector vref (10) of Figure 1 describing a circle (10 ') whose maximum radius has a value:
    [0120]
    [0121]
    [0122]
    [0123]
    [0124] where VCC is the value of the continuous voltage on the DC bus of the converter. Since the converter cannot actually generate intermediate vectors between (t ^, V3, V3, %, V3 and V2), a modulation is used that, on average, places spatial vectors in intermediate positions of the hexagon and allows v ref traverse the circumference (10 ') represented in Figure 1 or another concentric one of smaller radius.
    [0125]
    [0126] In the event that a switch (2, 2 ', 3, 3', 4, 4 ') of which the electronic converter (Sa, Sb, Sc, S'a, S'b, S'c) is made damaged, the three-phase electronic DC / AC converter (1) must be disconnected from the network.
    [0127]
    [0128] In the configuration of Figure 2, the three-phase electronic DC / AC converter (1) comprises three triacs (7, 7 ', 7' ') which, in the event that a switch is damaged (for example Sa and / or S 'a), the triacs (7, 7', 7 '') connect the phase of the affected network to the midpoint (6) of the DC bus formed by capacitors C-i and C2 (5, 5 ’), according to Figure 3.
    [0129]
    [0130] In this way, it is achieved that the three-phase DC / AC electronic converter (1) can continue to generate four spatial vectors (V00, V10 , i3 ^ and í301) that correspond to the four possible driving / blocking combinations of the switches in good state (in this example Sb, Sc, S'b, S'c) shown in Figure 4.
    [0131] The possible combinations for the conduction / blocking states of Sb, Sc, S’b, S’c are shown in Table 4, which shows on the right the va-vp coordinates of the spatial vectors to which these combinations give rise. Note that the values of these coordinates depend on the voltage in the capacitors (5, 5 ’), so if vc1 and vc2 are not constant, the coordinates will not be either, producing a movement of the vectors.
    [0132]
    [0133]
    [0134]
    [0135] Table 4
    [0136]
    [0137] The spatial vectors have been named as V00, V10, V1: L and V01 in Figure 5. As seen in Figure 5, the modules of the vectors are only two to two equal and form a rhombus (11) instead of a regular hexagon (9) as in Figure 1.
    [0138]
    [0139] If the voltage at capacitors C1 and C2 is constant, the maximum modulus of the spatial vector v ref is, after the fault, reduced: (Vdc / 2) / V3 instead of Vdc / 23.
    [0140]
    [0141] When current flows through the phase connected to the midpoint (6) of the capacitors (5, 5 '), voltage oscillations occur in the capacitors that cause the modules and angles of the space vectors F 00, V10, V11 (V01 are not constant, as shown in Figure 6.
    [0142]
    [0143] Due to the voltage fluctuations in capacitors C1 and C2, the maximum modulus of the spatial vector v ref is not constant , resulting
    [0144]
    [0145]
    [0146] This fact is also reflected in Figure 6 through the maximum length of the radius R that the space vector vref can describe where on the left the radius is vc 2 / V 3 and on the right V d & 2 3.
    [0147]
    [0148] These variations in modulus and angle make it difficult to use the vectors F00, F10, í ^ 11, F 01 to make a correct modulation of a vref vector that rotates 360 ° in the a - P plane since the modulator vectors F00, F10, í 1 ^ 1 and F01 would vary constantly.
    [0149]
    [0150] In spatial vector modulation, all modulation is performed with vectors that allow the vref vector to be obtained by a linear combination of the spatial vectors. Thus, a vref vector located in the first quadrant of 90 ° would be modulated using F00, F10. A vector
    [0151] vref located between 90 ° and 180o would be modulated using F 10 and í ^ 11. A v ref vector located between 180o and 2700 would be modulated using í 1 ^ 1 and F01. Finally, a vector located between 2700 and 3600 would be modulated using F 01 and F00.
    [0152]
    [0153] However, due to the variation of the voltage in the capacitors, the quadrants move and it is not possible to know precisely when the vector v ref is located in a quadrant or has passed to the next quadrant.
    [0154]
    [0155] The present invention stabilizes the quadrants to facilitate vector modulation. Additionally, the present invention allows to obtain six modulating vectors forming a hexagon from the four modulating vectors that form the unstable rhombus, to be able to use a conventional spatial vector modulation (SVM). This makes changes in conventional spatial vector modulation (SVM) before and after the breakdown minimal, and allows you to continue enjoying the advantages of a conventional SVM, such as higher output voltage for the same Vcc or better content in harmonics.
    [0156]
    [0157] To carry out the foregoing, the method of the present invention distinguishes two cases:
    [0158]
    [0159] A) v C1 = v # 2 = VCC & 2
    [0160] B) v # 1 'v # 2 ' V cc ^
    [0161] A) Case in which vci = vc2 = VCC / 2:
    [0162]
    [0163] In the case where the voltage in the capacitors (5, 5 ') is reasonably constant, and therefore, vc1 = vc2 = VCC / 2, the hexagon (9) formed by vectors V2 , K C V2 and V2 , from the voltage vectors generated by the three-phase DC / AC converter V oo, í2 oi , V 1o and í2 11 when there is a failure of one or two switches (2, 2 ', 3, 3', 4, 4 ') in the same phase, as follows:
    [0164]
    [0165] - connect the faulty phase of at least one switch to the midpoint (6) of the DC bus formed between capacitors C1 and C2;
    [0166] - match the voltage vector V of the hexagon to the voltage vector V oo;
    [0167] - calculate the voltage vector V 2 by applying 50% of the period the voltage vector V oo and the other 50% of the period the voltage vector V io. On average, the resulting voltage vector V 2 has a VCC / 3 module and an angle of 60o;
    [0168] - calculate the voltage vector V 3 by applying 50% of the period the voltage vector V io and the other 50% of the period the voltage vector 11. 11. On average, the resulting voltage vector V 3 has the VCC module / 3 and an angle of 1200;
    [0169] - equalize the tension vector V4 of the hexagon to the tension vector Vn;
    [0170] - calculate the voltage vector V 5 by applying 50% of the period the voltage vector V 11 and the other 50% of the period the voltage vector V or 1. On average, the resulting voltage vector V 5 has the VCC module / 3 and an angle of 2400;
    [0171] - calculate the voltage vector V 6 by applying 50% of the period the voltage vector V o1 and the other 50% of the period the voltage vector V oo. On average, the resulting voltage vector V 6 has the VCC / 3 module and an angle of 300 °.
    [0172]
    [0173] The resulting hexagon has a smaller size since the module of the voltage vectors is VCC / 3. However, it is possible to use the resulting hexagon in a conventional “SVM” space vector modulator (8) just taking into account that the equivalent DC bus voltage is VCC / 2, figure 8, instead of the normal value, VCC, used before connecting the phase (or branch with faulty switches) to the midpoint of the capacitors.
    [0174] Using an SVM modulator it is possible to generate, after the breakdown, with the electronic converter a three-phase voltage by rotating the vref vector inside the hexagon.
    [0175] For example, in Sector I, calling dVi and dV2 the percentages or duty cycles used by a conventional SVM (before breakdown in a switch) to modulate vref using V and V2
    [0176]
    [0177]
    [0178] After the breakdown, once the phase is connected to the midpoint (6) of capacitors C1 and C2, these two duty cycles are really combined with the duty cycles necessary to rebuild V2 using V00 and V10, that is to say with dVoo = dVl0 = 50% = 1/2
    [0179] So,
    [0180]
    [0181]
    [0182]
    [0183] Thus, DVooyDVio global duty cycles to obtain vref from V00 and V10 vectors result:
    [0184]
    [0185]
    [0186]
    [0187] The duty cycle of the zero module vector is, in this case
    [0188]
    [0189]
    [0190] and in a general case
    [0191]
    [0192] The zero module vector is not available as in a conventional SVM (closing or opening three switches). However, it can be obtained using any pair of opposite vectors (F00 and V 1: L or V 10 and V 01) and distribute its application in 50% d Vocada one so that, on average, its value is zero.
    [0193]
    [0194] The advantage obtained is that, after the breakdown, the electronic converter can still be used and done with conventional SVM software by adding minimal modifications, as shown in Figure 8.
    [0195]
    [0196] Figure 8a) shows the SVM software module before the fault, where the inputs are the aP coordinates of the vector to be modulated, vref, and the voltage value on the DC bus of the electronic converter, VCC. The outputs are duty cycles d V. and d Vj + 1 of the vectors
    [0197] V and V j + 1 calculated to modulate vref in each sector of the hexagon.
    [0198]
    [0199] Figures 8b) to 8g) show, for vc1 = vc2 = VCC / 2 and for each sector of the hexagon, how to combine the outputs of the conventional SVM to, after the breakdown, obtain the duty cycles according to the invention. In all six cases, the DC voltage input is, after the fault, VCC / 2.
    [0200]
    [0201] Table 2 shows the global duty cycles , D Vky D Vk + i, of each vector V 00, V 10, V 1: L, V 01 in each sector of the hexagon.
    [0202]
    [0203]
    [0204]
    [0205] Table 2
    [0206] B) Case in which vcl 'v c2 ' V cc / 2:
    [0207]
    [0208] A second part of the invention addresses the case in which the voltage of the capacitors (5.5 ') is not constant due to the effect of the alternating current of the phase connected to the midpoint of the capacitors, resulting in vc1 ' v c2 . It would be the case in which the capacitor capacity is low or the phase current is very high.
    [0209]
    [0210] Similar to case A), the steps to construct the hexagon with the following particularities are reproduced.
    [0211]
    [0212] In this case, more complex, the vectors V ° °, Vw, V 11 , F01 "move" as their modulus and angle (phase) change as they do vc1 and vc2 as indicated in the two columns of the right of Table 1. Consequently, the rhombuses in Figure 6 also "move" with the voltage variations of vc1 and vc2.
    [0213]
    [0214] It must be considered that the vector v ref that can be rotated in a circle inscribed to the hexagon now has a maximum modulus determined by:
    [0215]
    [0216]
    [0217]
    [0218]
    [0219] The consequence is that the size of the hexagon changes continuously with the values of vc1 and vc2, as shown in Figure 9 between a minimum hexagon (9 ’) and a maximum hexagon (9’).
    [0220]
    [0221] The problem of the variation of voltages vc1 and vc2 can be overcome by recalculating the duty cycles to keep the vectors% *, %, Vj, %, % and% located exactly at O0, 60 °, 120 °, 180 °, 240 °, 300 ° and 360 °.
    [0222]
    [0223] Because the voltage in the capacitors changes slowly compared to the cycle time of the microprocessor where the control is implemented, it is easy to make continuous corrections to the duty cycles to stabilize the position (angle) of the vectors that form the hexagon, although you cannot prevent your module from fluctuating.
    [0224] Taking into account Table 2, the duty cycles that reconstruct the hexagon ( V ^ V 2 > V 3 , V 4 > F 5 , V 6 ) and stabilize their angles, from the vectors ( Voo>Voi> Vio , V 1 : L ) when the voltages v c1 and v c2 are not constant, they have to be calculated according to Table 3 and the duty cycles, dVl>dV2>dV3> dV4, dVs, dV g, which are used to modulate vref are provided by the SVM. Together, the global duty cycles resulting from composing both modulations are DVk and DVk + i .
    [0225]
    [0226] Note that in this table, V 2 V 3 ~ K 5 ~ V 6 share the same dV1o> d V01 but d V00 and d V11 change for each vector. The term "a" is common to all of them and its value has been indicated in the upper left corner of Table 3.
    [0227]
    [0228]
    [0229]
    [0230] Table 3
    权利要求:
    Claims (4)
    [1]
    1.- Control method of a three-phase DC / AC electronic converter with one-phase failure, where the three-phase DC / AC electronic converter comprises a direct current bus formed by at least two capacitors (C1, C2) in series, characterized in that understands:
    - connect the fault phase of at least one switch with the midpoint of the DC bus formed between capacitors C1 and C2;
    - measure voltage vectors V 00, V 01 , V 10 and F1: L, generated by the three-phase DC / AC converter when the three-phase DC / AC electronic converter has a fault of at least one switch in the same phase;
    - calculate a voltage vector V by applying the voltage vector F00 during the% of the period defined as d Voo;
    - calculate a voltage vector V 2 by applying the voltage vector V 00 during the% of the period defined as d Voo and the voltage vector V 10 during the% of the period defined as d v1o;
    - calculate a voltage vector V 3 by applying the voltage vector F10 during the% of the period defined as d Vio and the voltage vector í ^ 11 during the% of the period defined as d v11;
    - calculate a voltage vector V4 by applying the voltage vector
    [2]
    2. Control method of a three-phase DC / AC electronic converter with one-phase failure, according to claim 1, characterized in that, when the voltage in the capacitors is constant vci = vc2 = VCC / 2, the method further comprises:
    - limit the module of the vref vector to:
    _ V cc / 2
    V ref max ^ 3
    - maintain the phase of the vectors% *, %, V3, %, % and% located exactly at 0o, 60o, 120o, 180o, 240o, 300o and 360o by calculating the duty cycles
    d Voo _ d y01 _ d y10 _ d Vll _ 5 °% _ 1/2 ;
    - carry out a spatial vector modulation stage, SVM, using an SVM spatial vector modulator, which calculates the duty cycles dVl, dV2, dV3, dV4, dVs, dVg that give rise to vref from% *, % 2, V3, %, % and% according to Table 1, giving rise to global duty cycles, AVk, AVk; i:

    [3]
    3. Control method of a three-phase electronic DC / AC converter with one-phase failure, according to claim 1, when the voltage in the capacitors is different vc1 # vc2 # VCC / 2, characterized in that it comprises:
    - limit the module of the vref vector to a maximum value:
    minimum ( v cl , v c2 )
    V ref max _
    - maintain the phase of vectors Vr1, V2, t / 3, V4, Ví and V6 located exactly at 0o, 60o, 120o, 180o, 240o, 300o and 360o by calculating the duty cycles shown in Table 2:
    2 + d V3 )) V ll '(C V ** ' d V3 ) 1 1 'd ^ o

    [4]
    4. Control method of a three-phase DC / AC electronic converter with one-phase failure, according to any one of the preceding claims, characterized in that it additionally comprises:
    - generate, after the fault, with the three-phase electronic DC / AC converter, a three-phase voltage by rotating the vref vector inside the hexagon.
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