CN203608108U - Capacitance voltage self-balancing circuit of modular multilevel converter - Google Patents
Capacitance voltage self-balancing circuit of modular multilevel converter Download PDFInfo
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- CN203608108U CN203608108U CN201320832959.2U CN201320832959U CN203608108U CN 203608108 U CN203608108 U CN 203608108U CN 201320832959 U CN201320832959 U CN 201320832959U CN 203608108 U CN203608108 U CN 203608108U
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Abstract
The utility model relates to a capacitance voltage self-balancing circuit of a modular multilevel converter. The capacitance voltage self-balancing circuit of the modular multilevel converter comprises an electronic switch unit, at least two sub-modules, at least one control unit and at least one current-limiting unit, wherein each sub-module comprises a plurality of power switch tubes, two output ends and a pair of positive/negative direct-current buses, the first output end of the first sub-module is connected with the second output end of the second sub-module, the positive/negative buses at the direct-current sides of the first module and the second module are connected to switching ends of the electronic switch unit, and switching control signals are connected to an input end of the control unit; the output of the control unit is connected to a control end of the electronic switch unit; and an output end of the current-limiting unit is connected with the input end of the control unit so as to judge whether the switching current through the electronic switch unit is in an allowed range, and the on-off state of the electronic switch unit is controlled so as to enable the direct-current buses of adjacent sub-modules to be automatically connected in parallel at the right time, so that the capacitance voltage self-balancing of the sub-modules is realized.
Description
Technical field
The utility model relates to a kind of modular multilevel converter capacitance voltage self-balancing circuit, belongs to multilevel technical field.
Background technology
Modular multilevel converter (modular multilevel converter, MMC) topology adopts tandem type, modular, just can obtain the stepped-up voltage of many level without the direct series connection of power device, there is lower dU/dt and lower voltage harmonic content, in medium/high pressure hicap, have broad application prospects.MMC is made up of multiple power train, and each power train is formed by N half-bridge or the cascade of H bridge submodule, and each submodule DC side parallel has identical capacitor.Because each submodule DC bus capacitor of modular multilevel converter is in suspended state, when operation, each submodule electric capacity there will be and discharges and recharges difference, therefore can cause the imbalance problem of capacitance voltage.The safe operation of the uneven directly threat of capacitance voltage converter, therefore can effectively solve be the key of MMC safety, reliability service to this problem.
The balance method of capacitance voltage mainly contains software control algorithm and two kinds of methods of special hardware circuit.Software balancing control algorithm is through capacitance voltage detection, A/D conversion and microprocessor or DSP substantially, realizes the control of capacitance voltage closed loop balance, and control circuit and algorithm are comparatively complicated.
Publication number is the Chinese patent of CN1461088 disclosed " for the reversible transducer of chain static synchronous compensator voltage balance control ", propose to adopt at the additional special isolation DC-DC power circuit of each submodule DC side, discharged and recharged to realize the control of capacitance voltage balance by what detect and control DC bus capacitor device.But the method need to additionally increase external complex isolation DC-DC power circuit, volume is large, control is complicated.
Summary of the invention
The purpose of this utility model is to provide a kind of modular multilevel converter capacitance voltage self-balancing circuit.The method is utilized the own characteristic of modular multilevel converter, has that auxiliary element quantity is few, circuit structure is simple, does not need Detection capacitance voltage and does not need the advantages such as closed loop control algorithm.
To achieve these goals, the utility model adopts following technical scheme:
A kind of modular multilevel converter capacitance voltage self-balancing circuit, comprising:
Electronic switch unit;
At least two submodules, generate electronic switch control signal, each submodule comprises some power switch pipes and two outputs and a pair of positive/negative DC bus, the first output of the first submodule is connected with the second output of the second submodule, their the positive/negative bus of DC side is connected to the switch terminals of described electronic switch unit, and switch controlling signal is connected to the input of control unit;
At least one control unit, output is connected to the control end of described electronic switch unit;
At least one current limliting unit, the output of described current limliting unit connects the input of described control unit, whether in allowed limits to differentiate in described electronic switch unit switching current;
Control unit carries out exporting control signal to described electronic switch unit after logical operation to the output signal of the switch controlling signal from two described submodules and described current limliting unit, control the corresponding power switching tube conducting of described electronic switch unit, by the same polarity DC bus parallel connection of two submodules, thereby directly realize the self-balancing of two submodule DC capacitor voltages.
Described submodule is bear altogether/positive bus-bar half-bridge submodule, wherein half-bridge submodule is by 2 power switch pipe T1 and T2 with anti-paralleled diode, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, the collector electrode of T1 and capacitor C are anodal be connected after as the positive direct-current bus+d of described half-bridge submodule, after the emitter of T1 is connected with capacitor C negative pole as the negative DC bus-d of described half-bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described half-bridge submodule, negative DC bus-the d of described altogether negative busbar half-bridge submodule is directly as the second output B of described half-bridge submodule, positive direct-current bus+the d of described altogether positive bus-bar half-bridge submodule is directly as the second output B of described half-bridge submodule.
Described submodule is H bridge submodule, H bridge submodule is by 4 power switch pipe T1 with anti-paralleled diode, T2, T3 and T4, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, power switch pipe T3 connects with T4, be that the emitter of T3 and the collector electrode of T4 are connected, after the collector electrode of T1 is connected with the collector electrode of T3 as the positive direct-current bus+d of described H bridge submodule, after the emitter of T2 is connected with the emitter of T4 as the negative DC bus-d of described H bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described H bridge submodule, the tie point of T3 and T4 is as the second output B of described H bridge submodule.
Described electronic switch unit is power switch pipe Q21, and the emitter and collector of described power switch pipe Q21 connects respectively described two submodules; The break-make of described power switch pipe Q21 is controlled by the output signal G1 of control unit.
Described electronic switch unit is two power switch pipe Q11 and two-way gate-controlled switches of Q21 differential concatenation composition with anti-paralleled diode, two submodules of the direct cross-over connection of switch port of described electronic switch unit, the break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit.
Described two-way gate-controlled switch has two, and each all submodules corresponding to are connected, and the emitter of power switch pipe Q11 and Q21 is connected, and the collector electrode of power switch pipe Q12 and Q22 is connected; Control the utmost point and connect with corresponding control unit, control unit is also provided with two.
By one, the power switch pipe with anti-paralleled diode, a current-limiting inductance and a clamp fly-wheel diode form described electronic switch unit; One end of described current-limiting inductance and the collector electrode/emitter of described power switch pipe are connected respectively to described submodule, the other end of described current-limiting inductance is connected with the cathode/anode of the emitter/collector electrode of described power switch pipe and clamp fly-wheel diode, and the anode/cathode of diode is connected with a submodule; The break-make of described power switch pipe is by the output signal control of control unit.
By two, the power switch pipe Q11 with anti-paralleled diode and Q21, current-limiting inductance and two clamp sustained diode 12 and D22 form described electronic switch unit; The collector electrode of described switching tube Q11 and Q21 is connexon module respectively, the emitter of described switching tube Q11 and Q21 is connected to the two ends of current-limiting inductance, the anode of described clamp sustained diode 12 and D22 is connected respectively described submodule, and the negative electrode of described clamp sustained diode 12 and D22 is connected respectively the emitter of described switching tube Q11 and Q21; The break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit.
By two, the power switch pipe Q12 with anti-paralleled diode and Q22, current-limiting inductance and two clamp sustained diode 11 and D21 form described electronic switch unit; The emitter of described switching tube Q12 and Q22 is connexon module respectively, the collector electrode of described switching tube Q12 and Q22 is connected to the two ends of current-limiting inductance, the negative electrode of described clamp sustained diode 11 and D21 is connexon module respectively, and the anode of described clamp sustained diode 11 and D21 is connected respectively the collector electrode of described switching tube Q12 and Q22; The break-make of described power switch pipe Q12 and Q22 is controlled by the output signal G2 of control unit.
Current-limiting inductance of cross-over connection between described two two-way gate-controlled switches.
For N cascade submodule, need N-1 described electronic switch unit, wherein N is more than or equal to 2.
The beneficial effects of the utility model:
(1) the utility model utilizes the feature of modular multilevel converter, utilize adjacent submodule direct current plus or minus bus in running to occur the feature of same potential, utilize a small amount of hardware to realize the self-balancing of submodule DC capacitor voltage, circuit structure is simple, it is convenient to control, without submodule capacitance voltage testing circuit, without complicated isolated form DC-DC power circuit, without software control algorithm.
(2) the utility model also can be realized the electric capacity pre-charging functions of modular multilevel converter submodule by simple control.
Accompanying drawing explanation
Fig. 1 is used to the common negative busbar half-bridge sub modular structure of the modular multilevel converter of balance control;
Fig. 1 a is used to the common positive bus-bar half-bridge sub modular structure of the modular multilevel converter of balance control;
Fig. 1 b is used to the H bridge sub modular structure of the modular multilevel converter of balance control;
Fig. 1 c is used to two adjacent submodule winding diagrams in the power train of modular multilevel converter of balance control;
Fig. 2 modular multilevel converter of the present utility model capacitance voltage self-balancing circuit basic structure block diagram;
The multi-level converter capacitance voltage self-balancing circuit embodiments of Fig. 3 a kind of grade of negative busbar half-bridge of allying the communists of the present utility model;
The multi-level converter capacitance voltage self-balancing circuit embodiments of Fig. 3 a a kind of grade of positive bus-bar half-bridge of allying the communists of the present utility model;
The multi-level converter capacitance voltage self-balancing circuit embodiments of Fig. 4 a kind of Cascade H bridge of the present utility model;
The multi-level converter capacitance voltage self-balancing circuit embodiments of Fig. 4 a another kind of Cascade H bridge of the present utility model;
The multi-level converter capacitance voltage self-balancing circuit embodiments of Fig. 4 b another kind of Cascade H bridge of the present utility model;
The one of Fig. 5 Fig. 3 of the present utility model is improved circuit embodiments;
The one of Fig. 5 a Fig. 3 a of the present utility model is improved circuit embodiments;
The another kind of Fig. 5 b Fig. 3 of the present utility model improves circuit embodiments;
The another kind of Fig. 5 c Fig. 3 a of the present utility model improves circuit embodiments;
The one of Fig. 6 Fig. 4 of the present utility model is improved circuit embodiments;
The one of Fig. 6 a Fig. 4 a of the present utility model is improved circuit embodiments;
The one of Fig. 6 b Fig. 4 b of the present utility model is improved circuit embodiments;
A kind of embodiment when Fig. 7 the utility model is used for the precharge of modular multilevel converter submodule DC bus capacitor.
Wherein, 1, adjacent submodule, 1-1, the first submodule, 1-2, the second submodule, 2, electronic switch unit, 3, control unit, 4, Current limited Control unit, 5, current-limiting inductance, 6, electric capacity precharge DC power supply, 7, electric capacity precharge current-limiting resistance, 8, killer switch.Symbol, the first output of A, submodule, the second output of B, submodule, the positive direct-current side bus of+d, submodule, the negative DC side bus of-d, submodule, the first output of A1, the first submodule, B1, first submodule the second output, + d1, the first submodule positive direct-current side bus, the negative DC side bus of-d1, the first submodule, the first output of A2, the second submodule, B2, second submodule the second output, + d2, the second submodule positive direct-current side bus, the negative DC side bus of-d2, the second submodule.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Fig. 1 has provided a common negative busbar half-bridge submodule schematic diagram of the modular multilevel converter that is used to balance control, wherein half-bridge submodule is by 2 power switch pipe T1 and T2 with anti-paralleled diode, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, the collector electrode of T1 and capacitor C are anodal be connected after as the positive direct-current bus+d of described half-bridge submodule, after the emitter of T1 is connected with capacitor C negative pole as the negative DC bus-d of described half-bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described half-bridge submodule, negative DC bus-d is directly as the second output B of described half-bridge submodule.
Fig. 1 a has provided a common positive bus-bar half-bridge submodule schematic diagram of the modular multilevel converter that is used to balance control, wherein half-bridge submodule is by 2 power switch pipe T1 and T2 with anti-paralleled diode, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, the collector electrode of T1 and capacitor C are anodal be connected after as the positive direct-current bus+d of described half-bridge submodule, after the emitter of T1 is connected with capacitor C negative pole as the negative DC bus-d of described half-bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described half-bridge submodule, positive direct-current bus+d is directly as the second output B of described half-bridge submodule.
Fig. 1 b has provided a H bridge submodule schematic diagram of the modular multilevel converter that is used to balance control, H bridge submodule is by 4 power switch pipe T1 with anti-paralleled diode, T2, T3 and T4, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, power switch pipe T3 connects with T4, be that the emitter of T3 and the collector electrode of T4 are connected, after the collector electrode of T1 is connected with the collector electrode of T3 as the positive direct-current bus+d of described H bridge submodule, after the emitter of T2 is connected with the emitter of T4 as the negative DC bus-d of described H bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described H bridge submodule, the tie point of T3 and T4 is as the second output B of described H bridge submodule.
Fig. 1 c has provided the connection layout of two adjacent submodules in the concatenated power chain of the modular multilevel converter that is used to balance control, and in figure, the first output terminals A 1 of the first submodule 1-1 and the second output B2 of the second submodule 1-2 are connected.
Fig. 2 has provided modular multilevel converter capacitance voltage self-balancing circuit basic structure block diagram of the present utility model, and in figure, self-balancing circuit comprises electronic switch unit 2, control unit 3 and current limliting unit 4.The modular multilevel converter that is used to balance control comprises at least two adjacent submodules 1, i.e. the first submodule 1-1 and the second submodule 1-2, and the first output terminals A 1 of the first submodule 1-1 is connected with the second output B2 of the second submodule 1-2.Positive/negative DC bus+the d1 of DC side of described the first submodule 1-1 and-d1 is connected respectively to the first switch port Sp1 and Sn1 of described electronic switch unit 2, positive/negative DC bus+the d2 of DC side of described the second submodule 1-2 and-d2 is connected respectively to second switch port Sp2 and the Sn2 of described electronic switch unit 3, the switch state signal of described two submodules is connected to the input of described control unit 3, the output G of described control unit 3 is connected to the control end of described electronic switch unit, the output XL of described current limliting unit connects the input of described control unit.
A kind of modular multilevel converter capacitance voltage self-balance method of the present utility model, it is characterized in that: in the time of power switch pipe conducting between the first output terminals A 1 of described the first submodule 1-1 and one polarity DC bus (+d1 or-d1), and in the time of power switch pipe conducting between DC bus described in the second output B2 of described the second submodule 1-2 and its same polarity (+d2 or-d2), and in the time that described current limliting unit 4 differentiates in described electronic switch unit 2 that switching current is in allowed band, after carrying out logical operation to the output signal XL of the switch state signal K from two described submodules and described current limliting unit, export described control unit 3 control signal G to described electronic switch unit 2, control the switching tube conducting of described two another polarity DC buss of submodule of connection in described electronic switch unit 2, by the same polarity DC bus parallel connection of two submodules, + d1 and+d2 between short circuit,-d1 and-d2 between short circuit, thereby directly realize the self-balancing of two described adjacent submodule DC capacitor voltages.
Embodiment 1:
Fig. 3 has provided the multi-level converter capacitance voltage self-balancing circuit of a kind of grade of negative busbar half-bridge of allying the communists of the present utility model, in figure, electronic switch unit 2 is made up of a power switch pipe Q21 with anti-paralleled diode, the switch port of described electronic switch unit 2 be directly connected across adjacent two altogether negative busbar half-bridge the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between, the emitter and collector of described power switch pipe Q21 connect respectively described the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2; The break-make of described power switch pipe Q21 is controlled by the output signal G1 of control unit 3; The input signal K11 of control unit 3, from the switch controlling signal of the power switch T2 of the first submodule 1-1, has G1=K11, and wherein logical one represents control switch conducting, and logical zero represents that control switch disconnects.When switch transistor T 2 conductings of described the first submodule 1-1 make described the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between when short circuit, when K11=" 1 ", G1=" 1 ", control the power switch pipe Q21 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between short circuit, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Embodiment 2:
Fig. 3 a has provided the multi-level converter capacitance voltage self-balancing circuit of a kind of grade of positive bus-bar half-bridge of allying the communists of the present utility model, in figure, electronic switch unit 2 is made up of a power switch pipe Q22 with anti-paralleled diode, the switch port of described electronic switch unit 2 be directly connected across adjacent two altogether negative busbar half-bridge the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between, the collector and emitter of described power switch pipe Q22 connect respectively described the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2; The break-make of described power switch pipe Q22 is controlled by the output signal G2 of control unit 3; The input signal K12 of control unit 3, from the switch controlling signal of the power switch T1 of the first submodule 1-1, has G2=K12, and wherein logical one represents control switch conducting, and logical zero represents that control switch disconnects.When switch transistor T 1 conducting of described the first submodule 1-1 make described two half-bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between when short circuit, when K12=" 1 ", G2=" 1 ", control the power switch pipe Q22 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between short circuit, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Embodiment 3:
Fig. 4 has provided a kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit of the present utility model, in figure, by two, the power switch pipe Q11 with anti-paralleled diode and Q21 differential concatenation form a two-way gate-controlled switch to electronic switch unit 2, the switch port of described electronic switch unit 2 be directly connected across adjacent two H bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between, the collector electrode of described power switch pipe Q11 and Q21 be connected respectively described the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2; The break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit 3; Control unit 3 input signal K11 and K21 are respectively from the switch controlling signal of power switch T2 of the first submodule 1-1 and the switch controlling signal of the power switch T4 of the second submodule 1-2, described control unit 3 carries out logic "and" operation to two input signal K11 and K21, be G1=K11K21, wherein logical one represents control switch conducting, and logical zero represents that control switch disconnects.When the power switch T2 of described the first submodule 1-1 and the power switch T4 of described the second submodule 1-2 conducting simultaneously, make described the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between when short circuit, in the time of K11=" 1 " and K21=" 1 ", G1=" 1 ", control power switch pipe Q11 and the Q21 conducting of described electronic switch unit 2, make two described H the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between short circuit, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described the first submodule 1-1 and the second submodule 1-2 automatically realize balance.In figure, power switch pipe Q11 and the Q21 of electronic switch unit 2 can transpositions.
Embodiment 4:
Fig. 4 a has provided another kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit of the present utility model, in figure, by two, the power switch pipe Q12 with anti-paralleled diode and Q22 differential concatenation form a two-way gate-controlled switch to electronic switch unit 2, the switch port of described electronic switch unit 2 be directly connected across adjacent two H bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between, be the emitter of described power switch pipe Q12 and Q22 be connected respectively described the first half-bridge submodule 1-1 and the second half-bridge submodule 1-2 negative DC bus-d1 and-d2, the break-make of described power switch pipe Q12 and Q22 is controlled by the output signal G2 of control unit 3, control unit 3 input signal K12 and K22 are respectively from the switch controlling signal of power switch T1 of the first submodule 1-1 and the switch controlling signal of the power switch T3 of the second submodule 1-2, described control unit 3 carries out logic "and" operation to two input signal K12 and K22, be G2=K12K22, wherein logical one represents control switch conducting, and logical zero represents that control switch disconnects.When the power switch T1 of described the first submodule 1-1 and the power switch T3 of described the second submodule 1-2 conducting simultaneously, make described two H bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between when short circuit, in the time of K12=" 1 " and K22=" 1 ", G2=" 1 ", control power switch pipe Q12 and the Q22 conducting of described electronic switch unit 2, make two described H the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between short circuit, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described the first submodule 1-1 and the second submodule 1-2 automatically realize balance.In figure, power switch pipe Q12 and the Q22 of electronic switch unit 2 can transpositions.
Embodiment 5:
Fig. 4 b has provided another kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit of the present utility model, in figure, electronic switch unit 2 is combinations of electronic switch unit 2 in Fig. 4 and Fig. 4 a, control unit 3a is the control unit 3 of Fig. 4, control unit 3b is the control unit 3 of Fig. 4 a, and the present embodiment 5 is combinations of above-described embodiment 3 and 4.
The modular multilevel converter capacitance voltage self-balancing circuit that above-mentioned 5 embodiment provide is suitable for switching tube in described electronic switch unit 2 need not carry out the occasion of current limit.Provide the improvement project of above-mentioned 5 embodiment below, the switching tube in described electronic switch unit 2 is carried out to current limit, to reduce the current capacity of described switching tube, improve reliability.
Fig. 5 has provided the one of the multi-level converter capacitance voltage self-balancing circuit diagram 3 of a kind of grade of negative busbar half-bridge of allying the communists of the present utility model and has improved circuit, in figure, by one, the power switch pipe Q21 with anti-paralleled diode, a current-limiting inductance 5 and a clamp sustained diode 22 form electronic switch unit 2.The collector electrode of one end of described current-limiting inductance 5 and described power switch pipe Q21 be connected respectively to described the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2, the emitter of the other end of described current-limiting inductance 5 and described power switch pipe Q21 and the negative electrode of clamp sustained diode 22 are connected, and the anode of diode D22 is connected with negative DC bus-d2 of the second submodule 1-2.The break-make of described power switch pipe Q21 is controlled by the output signal G1 of control unit 3; The input signal K11 of control unit 3 and XL are respectively from the switch controlling signal of power switch T2 and the output of Current limited Control unit 4 of the first submodule 1-1, described control unit 3 carries out logic "and" operation to two input signal K11 and XL, be G1=K11XL, wherein K11 and G1 are that logical one represents to control respective switch conducting, disconnect for logical zero represents to control respective switch.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q21 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When switch transistor T 2 conductings of described the first submodule 1-1 make described two half-bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between when short circuit, and described switching current is in allowed band time, as K11=" 1 " and XL=" 1 ", time, G1=" 1 ", control the power switch pipe Q21 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Fig. 5 a has provided the one of the multi-level converter capacitance voltage self-balancing circuit diagram 3a of a kind of grade of positive bus-bar half-bridge of allying the communists of the present utility model and has improved circuit, in figure, by one, the power switch pipe Q22 with anti-paralleled diode, a current-limiting inductance 5 and a clamp sustained diode 21 form electronic switch unit 2.The collector electrode of one end of described current-limiting inductance 5 and described power switch pipe Q22 be connected respectively to described the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2, the emitter of the other end of described current-limiting inductance 5 and described power switch pipe Q22 and the anode of clamp sustained diode 21 are connected, and the negative electrode of diode D21 is connected with positive direct-current bus+d2 of the second submodule 1-2.The break-make of described power switch pipe Q22 is controlled by the output signal G2 of control unit 3; The input signal K12 of control unit 3 and XL are respectively from the switch controlling signal of power switch T1 and the output of Current limited Control unit 4 of the first submodule 1-1, described control unit 3 carries out logic "and" operation to two input signal K12 and XL, be G2=K12XL, wherein K12 and G2 are that logical one represents to control respective switch conducting, disconnect for logical zero represents to control respective switch.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q22 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When switch transistor T 1 conducting of described the first submodule 1-1 make described two half-bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between when short circuit, and described switching current is in allowed band time, as K12=" 1 " and XL=" 1 ", time, G2=" 1 ", control the power switch pipe Q22 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge submodule 1-1 and 1-2 automatically realize balance.
In the improvement circuit diagram 5 and Fig. 5 a of the modular multilevel converter capacitance voltage self-balance method that above-mentioned 2 embodiment 6 and 7 provide, electric current in current-limiting inductance 5 in electronic switch unit 2 is can only one direction controlled, the electric current that is positive flow overpower switch Q21 or Q22 is controlled, and the electric current of reverse direction flow overpower switch Q21 or Q22 (flowing through the electric current of Q21 or Q22 anti-paralleled diode) is uncontrollable.Embodiment 8 and 9 provides the one improvement of Fig. 5 of the present utility model and Fig. 5 a below, realizes two-way controlled to the electric current in described current-limiting inductance 5.
Fig. 5 b has provided the one of the multi-level converter capacitance voltage self-balancing improvement circuit diagram 5 of a kind of grade of negative busbar half-bridge of allying the communists of the present utility model and has improved circuit, in figure, by two, the power switch pipe Q11 with anti-paralleled diode and Q21, current-limiting inductance 5 and two clamp sustained diode 12 and D22 form electronic switch unit 2.The collector electrode of described switching tube Q11 and Q21 be connected respectively two half-bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2, the emitter of described switching tube Q11 and Q21 is connected to the two ends of current-limiting inductance 5, the anode of described clamp sustained diode 12 and D22 be connected respectively described two half-bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2, the negative electrode of described clamp sustained diode 12 and D22 is connected respectively the emitter of described switching tube Q11 and Q21.The break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit 3; The input signal K11 of control unit 3 and XL are respectively from the switch controlling signal of power switch T2 and the output of Current limited Control unit 4 of the first submodule 1-1, described control unit 3 carries out logic "and" operation to two input signal K11 and XL, be G1=K11XL, wherein K11 and G1 are that logical one represents to control respective switch conducting, disconnect for logical zero represents to control respective switch.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q11 and Q21 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When switch transistor T 2 conductings of described the first submodule 1-1 make described two half-bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between when short circuit, and described switching current is in allowed band time, as K11=" 1 " and XL=" 1 ", time, G1=" 1 ", control power switch pipe Q11 and the Q21 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Embodiment 9
Fig. 5 c has provided the one of the multi-level converter capacitance voltage self-balancing improvement circuit diagram 5a of a kind of grade of positive bus-bar half-bridge of allying the communists of the present utility model and has improved circuit, in figure, by two, the power switch pipe Q12 with anti-paralleled diode and Q22, current-limiting inductance 5 and two clamp sustained diode 11 and D21 form electronic switch unit 2.The emitter of described switching tube Q12 and Q22 be connected respectively two half-bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2, the collector electrode of described switching tube Q12 and Q22 is connected to the two ends of current-limiting inductance 5, the negative electrode of described clamp sustained diode 11 and D21 be connected respectively described two half-bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2, the anode of described clamp sustained diode 11 and D21 is connected respectively the collector electrode of described switching tube Q12 and Q22.The break-make of described power switch pipe Q12 and Q22 is controlled by the output signal G2 of control unit 3; The input signal K12 of control unit 3 and XL are respectively from the switch controlling signal of power switch T1 and the output of Current limited Control unit 4 of the first submodule 1-1, described control unit 3 carries out logic "and" operation to two input signal K12 and XL, be G2=K12XL, wherein K12 and G2 are that logical one represents to control respective switch conducting, disconnect for logical zero represents to control respective switch.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q12 and Q22 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When switch transistor T 1 conducting of described the first half-bridge submodule 1-1 make described two half-bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between when short circuit, and described switching current is in allowed band time, as K12=" 1 " and XL=" 1 ", time, G2=" 1 ", control power switch pipe Q12 and the Q22 conducting of described electronic switch unit 2, make two described half-bridge the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described half-bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Embodiment 10
Fig. 6 has provided the improvement circuit of a kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit diagram 4 of the present utility model, in figure, by two, the power switch pipe Q11 with anti-paralleled diode and Q21, current-limiting inductance 5 and two clamp sustained diode 12 and D22 form electronic switch unit 2.The collector electrode of described switching tube Q11 and Q21 be connected respectively two H bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2, the emitter of described switching tube Q11 and Q21 is connected to the two ends of current-limiting inductance 5, the anode of described clamp sustained diode 12 and D22 be connected respectively described two H bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2, the negative electrode of described clamp sustained diode 12 and D22 is connected respectively the emitter of described switching tube Q11 and Q21.The break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit 3, described control unit 3 has three input signal K11, K21 and XL, wherein the first input signal K11 is from the switch controlling signal of the power switch T2 of the first submodule 1-1, the second input signal K21 is from the switch controlling signal of the power switch T4 of the second submodule 1-2, the 3rd input signal XL is from Current limited Control unit 4, described control unit 3 is to its three input signal K11, K21 and XL carry out logic "and" operation, be G1=K11K21XL, wherein K11, K21 and G1 are that logical one represents to control respective switch conducting, for representing to control respective switch, logical zero disconnects.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q11 and Q21 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When the power switch T2 of described the first submodule 1-1 and the power switch T4 of described the second submodule 1-2 conducting simultaneously, make described two H bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between when short circuit, and described switching current is in allowed band time, as K11=" 1 " and K21=" 1 " and XL=" 1 ", time, G1=" 1 ", control power switch pipe Q11 and the Q21 conducting of described electronic switch unit 2, make two described H the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described H bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Fig. 6 a has provided the improvement circuit of a kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit diagram 4a of the present utility model, in figure, by two, the power switch pipe Q12 with anti-paralleled diode and Q22, current-limiting inductance 5 and two clamp sustained diode 11 and D21 form electronic switch unit 2.The emitter of described switching tube Q12 and Q22 be connected respectively two H bridges the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2, the collector electrode of described switching tube Q12 and Q22 is connected to the two ends of current-limiting inductance 5, the negative electrode of described clamp sustained diode 11 and D21 be connected respectively described two H bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2, the anode of described clamp sustained diode 11 and D21 is connected respectively the collector electrode of described switching tube Q12 and Q22.The break-make of described power switch pipe Q12 and Q22 is controlled by the output signal G2 of control unit 3, described control unit 3 has three input signal K12, K22 and XL, wherein the first input signal K12 is from the switch controlling signal of the power switch T1 of the first submodule 1-1, the second input signal K22 is from the switch controlling signal of the power switch T3 of the second submodule 1-2, the 3rd input signal XL is from Current limited Control unit 4, described control unit 3 is to its three input signal K12, K22 and XL carry out logic "and" operation, be G2=K12K22XL, wherein K12, K22 and G2 are that logical one represents to control respective switch conducting, for representing to control respective switch, logical zero disconnects.The switching current of described Current limited Control unit 4 to described electronic switch unit 2, flow through current-limiting inductance 5 or switching tube Q12 and Q22 electric current, judge and control, in the time that described switching current is in allowed band, XL is logical one, in the time that described switching current exceeds allowed band, XL is logical zero.When the power switch T1 of described the first submodule 1-1 and the power switch T3 of described the second submodule 1-2 conducting simultaneously, make described two H bridges the first submodule 1-1 and the second submodule 1-2 positive direct-current bus+d1 and+d2 between when short circuit, and described switching current is in allowed band time, as K12=" 1 " and K22=" 1 " and XL=" 1 ", time, G2=" 1 ", control power switch pipe Q12 and the Q22 conducting of described electronic switch unit 2, make the first submodule 1-1 and the second submodule 1-2 negative DC bus-d1 and-d2 between by current-limiting inductance 5 short circuits, it is the same polarity DC bus parallel connection of described two submodules, thereby make the DC bus capacitor C voltage of adjacent two described H bridge the first submodule 1-1 and the second submodule 1-2 automatically realize balance.
Embodiment 12
Fig. 6 b has provided the improvement circuit of another kind of Cascade H bridge multi-level converter capacitance voltage self-balancing circuit diagram 4b of the present utility model, in figure, electronic switch unit 2 is to have increased current-limiting inductance 5 on the basis of Fig. 4 b, on the basis of Fig. 4 b, the input signal of control unit 3a and 3b has increased the output signal XL of Current limited Control unit, in other words, the present embodiment 5 is combinations of above-described embodiment 10 and 11.
Embodiment 13:
The utility model can be used for the DC bus capacitor precharge of the submodule of modular multilevel converter.Fig. 7 has provided electric capacity precharge power supply wiring figure, and in figure, DC power supply 6 is exported through current-limiting resistance 7 and killer switch 8.The output U+ of killer switch 8 and U-are connected respectively to positive direct-current bus+d1 and the negative DC bus-d1 of the first submodule 1-1 of modular multilevel inverter power chain; By controlling power switch pipe and the capacitance voltage self-balancing circuit of the present utility model of cascade submodule of described modular multilevel converter, make the same polarity DC bus parallel connection of the adjacent submodule of described power train, the DC bus capacitor of all submodules to described power train is implemented precharge.Specific embodiments is:
(1) for ally the communists embodiment 1(Fig. 3 of multi-level converter capacitance voltage of negative busbar half-bridge of level), embodiment 6(Fig. 5) and embodiment 8(Fig. 5 b), the ally the communists lower pipe T2 of all half-bridge submodules of negative busbar half-bridge power chain of level is applied and opens signal.
(2) for level ally the communists positive bus-bar half-bridge submodule modular multilevel converter embodiment 2(Fig. 3 a), embodiment 7(Fig. 5 a) and embodiment 9(Fig. 5 c), the ally the communists upper pipe T1 of all half-bridge submodules of positive bus-bar half-bridge power chain of level is applied and opens signal;
(4) for embodiment 3(Fig. 4 of the modular multilevel converter of Cascade H bridge) and embodiment 10(Fig. 6), the lower pipe T2 of all submodules to Cascade H bridge power train and T4 apply and open signal;
(5) for embodiment 4(Fig. 4 of the modular multilevel converter of Cascade H bridge a) and embodiment 11(Fig. 6 a), the upper pipe T1 of all submodules to Cascade H bridge power train and T3 apply and open signal.
(6) for embodiment 5(Fig. 4 of the modular multilevel converter of Cascade H bridge b) and embodiment 12(Fig. 6 b), the lower pipe T2 of all submodules to Cascade H bridge power train and T4 apply and open signal; Or the upper pipe T1 of all submodules to Cascade H bridge power train and T3 apply and open signal.
Above-mentioned electric capacity precharge scheme is provided while controlling power supply by self DC bus capacitor for described submodule, electric capacity precharge order according to from the first submodule, the second submodule, the 3rd submodule ..., order, carry out successively precharge; When above-mentioned electric capacity precharge scheme independently provides control power supply for described submodule by outside, all submodules that electric capacity pre-charge circuit is described power train synchronously carry out precharge.
In the various embodiments described above, for N cascade submodule, need N-1 electronic switch unit, wherein N is more than or equal to 2.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (10)
1. a modular multilevel converter capacitance voltage self-balancing circuit, is characterized in that, comprising:
Electronic switch unit;
At least two submodules, generate electronic switch control signal, each submodule comprises some power switch pipes and two outputs and a pair of positive/negative DC bus, the first output of the first submodule is connected with the second output of the second submodule, their the positive/negative bus of DC side is connected to the switch terminals of described electronic switch unit, and switch controlling signal is connected to the input of control unit;
At least one control unit, output is connected to the control end of described electronic switch unit;
At least one current limliting unit, the output of described current limliting unit connects the input of described control unit, whether in allowed limits to differentiate in described electronic switch unit switching current;
Control unit carries out exporting control signal to described electronic switch unit after logical operation to the output signal of the switch controlling signal from two described submodules and described current limliting unit, control corresponding power switching tube conducting in described electronic switch unit, by the same polarity DC bus parallel connection of two submodules, thereby directly realize the self-balancing of two submodule DC capacitor voltages.
2. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, it is characterized in that, described submodule is bear altogether/positive bus-bar half-bridge submodule, wherein half-bridge submodule is by 2 power switch pipe T1 and T2 with anti-paralleled diode, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, the collector electrode of T1 and capacitor C are anodal be connected after as the positive direct-current bus+d of described half-bridge submodule, after the emitter of T1 is connected with capacitor C negative pole as the negative DC bus-d of described half-bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described half-bridge submodule, negative DC bus-the d of described altogether negative busbar half-bridge submodule is directly as the second output B of described half-bridge submodule, positive direct-current bus+the d of described altogether positive bus-bar half-bridge submodule is directly as the second output B of described half-bridge submodule.
3. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, it is characterized in that, described submodule is H bridge submodule, H bridge submodule is by 4 power switch pipe T1 with anti-paralleled diode, T2, T3 and T4, and capacitor C composition, wherein power switch pipe T1 connects with T2, be that the emitter of T1 and the collector electrode of T2 are connected, power switch pipe T3 connects with T4, be that the emitter of T3 and the collector electrode of T4 are connected, after the collector electrode of T1 is connected with the collector electrode of T3 as the positive direct-current bus+d of described H bridge submodule, after the emitter of T2 is connected with the emitter of T4 as the negative DC bus-d of described H bridge submodule, the tie point of T1 and T2 is as the first output terminals A of described H bridge submodule, the tie point of T3 and T4 is as the second output B of described H bridge submodule.
4. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, is characterized in that, described electronic switch unit is power switch pipe Q21, and the emitter and collector of described power switch pipe Q21 connects respectively described two submodules; The break-make of described power switch pipe Q21 is controlled by the output signal G1 of control unit.
5. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, it is characterized in that, described electronic switch unit is two power switch pipe Q11 and two-way gate-controlled switches of Q21 differential concatenation composition with anti-paralleled diode, two submodules of the direct cross-over connection of switch port of described electronic switch unit, the break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit.
6. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 5, it is characterized in that, described two-way gate-controlled switch has two, and each all submodules corresponding to are connected, the emitter of power switch pipe Q11 and Q21 is connected, and the collector electrode of power switch pipe Q12 and Q22 is connected; Control the utmost point and connect with corresponding control unit, control unit is also provided with two.
7. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, is characterized in that, by one, the power switch pipe with anti-paralleled diode, a current-limiting inductance and a clamp fly-wheel diode form described electronic switch; One end of described current-limiting inductance and the collector electrode/emitter of described power switch pipe are connected respectively to described submodule, the other end of described current-limiting inductance is connected with the cathode/anode of the emitter/collector electrode of described power switch pipe and clamp fly-wheel diode, and the anode/cathode of diode is connected with a submodule; The break-make of described power switch pipe is by the output signal control of control unit.
8. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, it is characterized in that, by two, the power switch pipe Q11 with anti-paralleled diode and Q21, current-limiting inductance and two clamp sustained diode 12 and D22 form described electronic switch unit; The collector electrode of described switching tube Q11 and Q21 is connexon module respectively, the emitter of described switching tube Q11 and Q21 is connected to the two ends of current-limiting inductance, the anode of described clamp sustained diode 12 and D22 is connected respectively described submodule, and the negative electrode of described clamp sustained diode 12 and D22 is connected respectively the emitter of described switching tube Q11 and Q21; The break-make of described power switch pipe Q11 and Q21 is controlled by the output signal G1 of control unit.
9. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 1, it is characterized in that, by two, the power switch pipe Q12 with anti-paralleled diode and Q22, current-limiting inductance and two clamp sustained diode 11 and D21 form described electronic switch unit; The emitter of described switching tube Q12 and Q22 is connexon module respectively, the collector electrode of described switching tube Q12 and Q22 is connected to the two ends of current-limiting inductance, the negative electrode of described clamp sustained diode 11 and D21 is connexon module respectively, and the anode of described clamp sustained diode 11 and D21 is connected respectively the collector electrode of described switching tube Q12 and Q22; The break-make of described power switch pipe Q12 and Q22 is controlled by the output signal G2 of control unit.
10. modular multilevel converter capacitance voltage self-balancing circuit as claimed in claim 6, is characterized in that, current-limiting inductance of cross-over connection between described two two-way gate-controlled switches.
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| CN105429491A (en) * | 2016-01-25 | 2016-03-23 | 华北电力大学 | Inequality constraints-based auxiliary capacitor concentrated single clamping MMC self voltage-sharing topology |
| CN105450048A (en) * | 2016-01-25 | 2016-03-30 | 华北电力大学 | Auxiliary capacitance distributed type half-bridge/single-clamping parallel-serial MMC self-voltage-sharing topology based on equality constraints |
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| CN105450069A (en) * | 2016-01-25 | 2016-03-30 | 华北电力大学 | Auxiliary capacitance concentrated type full-bridge MMC self-voltage-sharing topology based on equality constraints |
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| CN105471259A (en) * | 2016-01-25 | 2016-04-06 | 华北电力大学 | Auxiliary capacitor centralized half-bridge/single-clamping series-parallel MMC automatic voltage-equalizing topology based on equality constraint |
| CN105471307A (en) * | 2016-01-25 | 2016-04-06 | 华北电力大学 | Auxiliary capacitor distributed type half-bridge/single-clamping series-parallel MMC automatic voltage-equalizing topology based on inequality constraint |
| CN105471306A (en) * | 2016-01-25 | 2016-04-06 | 华北电力大学 | Auxiliary capacitor distributed type full-bridge MMC automatic voltage-equalizing topology based on inequality constraint |
| CN105471303A (en) * | 2016-01-25 | 2016-04-06 | 华北电力大学 | Auxiliary capacitor distributed type single-clamping MMC automatic voltage-equalizing topology based on equality constraint |
| CN105471301A (en) * | 2016-01-25 | 2016-04-06 | 华北电力大学 | Auxiliary capacitor centralized half-bridge/full-bridge series-parallel MMC automatic voltage-equalizing topology based on equality constraint |
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| CN105515425A (en) * | 2016-01-25 | 2016-04-20 | 华北电力大学 | Auxiliary capacitor distributed half-bridge and full-bridge series-parallel MMC self-voltage-sharing topology based on inequality constraints |
| CN105450049A (en) * | 2016-01-25 | 2016-03-30 | 华北电力大学 | Auxiliary capacitance concentrated type half-bridge/full-bridge parallel-serial MMC self-voltage-sharing topology based on inequality constraints |
| CN105515427A (en) * | 2016-01-25 | 2016-04-20 | 华北电力大学 | Auxiliary-capacitor-free full-bridge MMC self-voltage-sharing topology based on inequality constraints |
| CN105515428A (en) * | 2016-01-25 | 2016-04-20 | 华北电力大学 | Auxiliary-capacitor-free half-bridge MMC self-voltage-sharing topology based on inequality constraints |
| CN105515424A (en) * | 2016-01-25 | 2016-04-20 | 华北电力大学 | Auxiliary capacitor centralized full-bridge MMC self-voltage-sharing topology based on inequality constraints |
| CN105610340A (en) * | 2016-01-25 | 2016-05-25 | 华北电力大学 | Equality constraint-based half-bridge/full-bridge series-parallel MMC self-equalizing topology employing distributed auxiliary capacitors |
| CN105634316A (en) * | 2016-01-25 | 2016-06-01 | 华北电力大学 | Equality constraint-based full-bridge MMC self-equalizing topology employing distributed auxiliary capacitors |
| CN105515426A (en) * | 2016-01-25 | 2016-04-20 | 华北电力大学 | Auxiliary capacitor concentrated type single-clamping MMC self-voltage-balancing topology based on equality constraints |
| CN105634318A (en) * | 2016-01-25 | 2016-06-01 | 华北电力大学 | Inequality constraint-based half-bridge MMC self-equalizing topology employing distributed auxiliary capacitors |
| CN105471306B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | Auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure |
| CN105634316B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | Auxiliary capacitor distribution full-bridge MMC based on equality constraint is topological from pressure |
| CN105515427B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | It is topological from pressure without auxiliary capacitor formula full-bridge MMC based on inequality constraints |
| CN105450069B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | Auxiliary capacitor centralization full-bridge MMC based on equality constraint is topological from pressure |
| CN105515424B (en) * | 2016-01-25 | 2018-10-30 | 华北电力大学 | Auxiliary capacitor centralization full-bridge MMC based on inequality constraints is topological from pressure |
| CN105897019A (en) * | 2016-05-26 | 2016-08-24 | 华北电力大学 | Equality constraint based modular multilevel converter (MMC) automatic voltage sharing topology |
| US11973436B2 (en) | 2017-06-12 | 2024-04-30 | Tae Technologies, Inc. | Multi-level multi-quadrant hysteresis current controllers and methods for control thereof |
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