CN202759233U - Power grid fault ride-through control device for flexible DC transmission system - Google Patents
Power grid fault ride-through control device for flexible DC transmission system Download PDFInfo
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- CN202759233U CN202759233U CN 201220396831 CN201220396831U CN202759233U CN 202759233 U CN202759233 U CN 202759233U CN 201220396831 CN201220396831 CN 201220396831 CN 201220396831 U CN201220396831 U CN 201220396831U CN 202759233 U CN202759233 U CN 202759233U
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Abstract
The utility model relates to a power grid fault ride-through control device for a flexible DC transmission system. The power grid fault ride-through control device comprises a control unit, a detection unit, a switchable braking resistor unit, a power voltage regulation unit and a full-bridge braking unit, wherein the switchable braking resistor unit is a device used for carrying out first-stage power release on the output of a rectifying end; the power voltage regulation unit is a device used for carrying out second-stage power release on the output of the switchable braking resistor unit; and the full-bridge braking unit is a device used for carrying out third-stage power release on the output of an inverter end. The power grid fault ride-through control device can detect the DC side bus voltage and the AC side bus voltage in real time, when a fault signal is detected, the DC changing-over switch is switched off, the second full-control switch is switched on, the first full-control switch is dynamically conducted, and the voltage is dynamically adjusted, so as to realize the maximum release of the surplus power; and the power grid fault ride-through control device can effectively suppress the DC bus overvoltage, prevents the DC transmission system equipment from locking, ensures the maximum transmission of the surplus power, and can function normally during the fault.
Description
Technical field
The utility model relates to the T ﹠ D Technology field, is specifically related to a kind of flexible DC power transmission system electric network fault and passes through control device.
Background technology
For flexible DC power transmission, for the environment that do not affect AC network stable operation and the security reliability of DC equipment itself, require when electrical network line voltage occurs and falls catastrophe failure (such as three phase short circuit fault etc.), direct current transportation equipment does not carry out failure locking as far as possible, again input after the failure locking of direct current and the fault recovery can be brought very large impact to whole AC/DC parallel system, also is huge to the damaging of flexible DC power transmission system simultaneously.Therefore require the flexible DC power transmission system can when fault occurs, continue operation, realize the fault traversing function.Up to now, the flexible direct current technology is in emerging developing stage, existing fault traversing technology also only rests on and adopts single Crowbar circuit theory, carry out excess power when breaking down and discharge, or only rely on the control mode switching of regulating the flexible DC power transmission system to finish the effect of stable DC busbar voltage.There is serious limitation in these technology, well do not reach raising flexible direct current AC fault and pass through level and suppress the DC bus-bar voltage fluctuation.Therefore design combination controlling method and control hardware structure, excess power provides the research work of path and Simultaneous Stabilization DC bus-bar voltage to seem of crucial importance in the time of can be take optimum mode as fault.
Summary of the invention
For the deficiency that prior art exists, the purpose of this utility model provides a kind of flexible DC power transmission system electric network fault and passes through control device, and fault current is decomposed, and reduces the loss of inverter overcurrent, realizes the fault traversing of flexible DC power transmission.
The technical solution of the utility model is achieved in that
A kind of flexible DC power transmission system electric network fault passes through control device, comprises control unit, and detecting unit also comprises changeable brake resistance unit, power voltage regulon and full-bridge brake unit;
Described changeable brake resistance unit is the device that discharges for the output of rectifier terminal being carried out first order power, described power voltage regulon is the device that discharges for the output of changeable brake resistance unit being carried out second level power, described full-bridge brake unit is the device that discharges for the output of inversion end being carried out third level power, wherein, connect with the dc bus of flexible DC power transmission system inversion end in changeable brake resistance unit, the power voltage regulon is in parallel with the dc bus of flexible DC power transmission system inversion end, the full-bridge brake unit is in parallel with the ac bus of flexible DC power transmission system inversion end, and the output of changeable brake resistance unit connects the input of power voltage regulon, the input of full-bridge brake unit connects the output of inversion end, two control ends of detecting unit connect the output of flexible DC power transmission system rectifier terminal, two control ends connect the input of inversion end, and other three outputs connect the input of electrical network.
Described changeable brake resistance unit comprises direct current diverter switch and the first brake resistance, and the two parallel connection, is in off-state by making the direct current diverter switch, makes the first brake resistance conducting, and power discharges.
Described power voltage regulon comprises the first electric capacity, the second electric capacity, energy storage inductor, the first full control switch, Power Diode Pumped and the second brake resistance, the positive pole of the first electric capacity connects respectively the output of changeable brake resistance unit and an end of energy storage inductor, the negative pole of the first electric capacity is connected to dc bus, the other end of energy storage inductor connects respectively an end of Power Diode Pumped one end and the first full control switch, the other end of Power Diode Pumped connects respectively an end of the second brake resistance and an end of the second electric capacity, the other end of the second electric capacity connects respectively the other end of the second brake resistance and the other end of the first full control switch, the other end of the negative pole connection first full control switch of the first electric capacity carries out power release by making the first full control switch be in conducting state.
Described full-bridge brake unit comprises full bridge rectifier, the 3rd brake resistance and the second full control switch, wherein, full bridge rectifier is connected in parallel on the AC bus of flexible DC power transmission system inversion end, the output of full bridge rectifier connect the 3rd brake resistance and the second full control switch, by making the second full control switch be in conducting state, carry out power and discharge.
Described detecting unit is used for detecting in real time DC side busbar voltage and the AC busbar voltage of flexible DC power transmission system inversion end.
Described control unit is realized power adjustments by transmitting control signal to changeable brake resistance unit, power voltage regulon and full-bridge brake unit.
The fault traversing of electrical network when adopting above-mentioned flexible DC power transmission system electric network fault to pass through control device to carry out flexible DC power transmission, carry out as follows:
Step 1: detecting unit detects DC side busbar voltage and the AC busbar voltage of flexible DC power transmission system inversion end in real time;
Step 2: the signal that detects is carried out the AD conversion, and the digital data transmission after the conversion is to control unit;
Step 3: judge whether this signal is fault-signal, be execution in step 4 then, otherwise return step 1;
Judge whether detection signal is fault-signal, specific as follows: the power that instant of failure flexible DC power transmission system carries is greater than the power of instant of failure inversion end output, the difference power that two power directly produce forms dump power, cause DC bus-bar voltage to rise rapidly, if detecting unit detects the DC bus-bar voltage U of inversion end during fault
1〉=2U
Dc(U
DcBe DC bus-bar voltage before the fault) and the AC busbar voltage U of inversion end
Abc≤ 0.1U
Abc(U
AbcBe inversion end AC bus voltage value before the fault), then the AC of flexible DC power transmission system inversion end line voltage occurs and falls fault, judges that namely detection signal is that line voltage falls fault-signal, this moment execution in step 4;
Step 4: control unit generates the pass of direct current diverter switch cut-off signal, the second full control switch and closes signal, conducting the first complete pwm control signal of controlling switch;
DC bus-bar voltage during fault and electric current pass through input voltage and the input current of control device as flexible DC power transmission system electric network fault, enter changeable brake resistance unit, when the direct current diverter switch disconnects, this dc bus input current is by the first brake resistance, discharge a part of power in the first brake resistance, dump power ingoing power voltage-regulation unit, control unit sends the dynamic conducting of pwm control signal control the first full control switch, the first electric capacity is to the energy storage inductor energy storage, thereby consume a part of power, dump power is as the output signal of power voltage regulon, export the AC of inversion end to through the inversion end, full control switch closed and closed this moment second, through the dump power of inversion end output the 3rd brake resistance of flowing through, consumed a part of dump power.
Step 5: the DC bus-bar voltage U of inversion end during according to the real-time fault that detects
1With the dc bus feedback voltage U that regulates through power voltage
2, dynamically judge
Whether set up, the then execution in step 6 that is false is set up and is then continued circulation execution in step 5;
Step 6: to the dc bus feedback voltage U that regulates through power voltage
2Carry out the PI regulating and controlling, calculate the PWM duty ratio, and the output pwm control signal is dynamically kept
The maximum that realizes dump power discharges;
Step 7: detecting unit detects the fault-signal isolation or disappears execution in step 8;
Step 8: control unit sends control signal out of service to changeable brake unit and full-bridge brake unit, send pwm pulse lock-in control signal to the power voltage regulon, make the direct current diverter switch closed, the first full control switch and the second full control switch disconnect;
Step 9: finish fault traversing.
Beneficial effect:
The utility model is conducive to improve the AC fault ride-through capability of flexible DC power transmission.In the flexible DC power transmission system, add changeable brake resistance unit, the power voltage regulon, the full-bridge brake unit, consist of the coordination control structure that flexible DC power transmission system AC fault passes through, by the utility model this control structure is coordinated control, the maximum that realizes excess power in the failure process discharges path, the dc bus overvoltage that inhibition is caused by AC fault, avoid simultaneously the DC transmission system device latchup, make it in failure process, carry out power delivery, reduced simultaneously the fault current of inverter side by using this control device, decompose fault current with optimum way, guarantee the dump power maximum transmitted, reduced the loss of inverter overcurrent, and can work between age at failure, integral body has realized that the AC fault of flexible DC power transmission passes through.Good running environment is provided for system safety is stable.Whole control structure is compact, optimizes reasonable coordination work between each unit, has realized fault traversing in the mode of lowest loss, has dissemination.
Description of drawings
The flexible DC power transmission system electric network fault of Fig. 1 the utility model embodiment passes through the control device structural representation, wherein, the changeable brake resistance of 1-unit, 2-power voltage regulon, 3-full-bridge brake unit, 4-detecting unit, the 5-control unit, the 6-rectifier terminal, 7-inversion end, 8-three phase network;
The flexible DC power transmission system electric network fault of Fig. 2 the utility model embodiment passes through control flow chart.
Embodiment
Below in conjunction with accompanying drawing implementation of the present utility model is described further.
In the present embodiment, flexible DC power transmission system transmission line capability is 100MW, DC bus-bar voltage is ± 220KV, as shown in Figure 1, the flexible DC power transmission system electric network fault of present embodiment passes through control device, comprises changeable brake resistance unit 1, power voltage regulon 2, full-bridge brake unit 3, detecting unit 4 and control unit 5; This device is connected in the flexible DC power transmission system, and this system comprises three phase network 8, rectifier terminal 6 and inversion end 7;
Changeable brake resistance unit 1 is connected on the dc bus of flexible DC power transmission system inversion end 7, power voltage regulon 2 is connected in parallel on the dc bus of flexible DC power transmission system inversion end 7, and the input of power voltage regulon connects the output of changeable brake resistance unit, full-bridge brake unit 3 is connected in parallel on the ac bus of flexible DC power transmission system inversion end 7, in the test side of detecting unit 4, wherein two test sides connect the output of rectifier terminal 6, two test sides connect flexible DC power transmission system inversion end 7 inputs, three test sides connect the input of three phase networks 8, the control end of control unit 5 respectively with changeable brake resistance unit 1, power voltage regulon 2, full-bridge brake unit 3 connects.
Described changeable brake resistance unit 1 comprises direct current diverter switch S1 and the first brake resistance R1, and the first brake resistance R1 is in parallel with direct current diverter switch S1; Direct current diverter switch S1 is the jumbo electric power thyristor that contains auxiliary handoff functionality, the first brake resistance R1 is high-power resistance, resistance is 4 Ω, control unit is realized the consumption of power by the shutoff of control direct current diverter switch, namely by making the direct current diverter switch be in off-state, make the first brake resistance conducting, power discharges.
Described power voltage regulon 2 comprises the first capacitor C 1, the second capacitor C 2, energy storage inductor L1, the first full control switch VT1, Power Diode Pumped VD1 and the second brake resistance R2, the positive pole of the first capacitor C 1 connects respectively the output of changeable brake resistance unit 2 and the end of energy storage inductor L1, the negative pole of the first capacitor C 1 is connected to dc bus, the other end of energy storage inductor L1 connects respectively the end of Power Diode Pumped VD1 one end and the first full control switch VT1, the other end of Power Diode Pumped VD1 connects respectively the end of the second brake resistance R2 and an end of the second capacitor C 2, the other end of the second capacitor C 2 connects respectively the other end of the second brake resistance R2 and the other end of the first full control switch VT1, the other end of the negative pole connection first full control switch VT1 of the first capacitor C 1 carries out power release by making the first full control switch VT1 be in conducting state.
PWM(pulse width modulation by control unit 5 outputs) control signal is controlled the first full control switch VT1, regulate duty ratio, realize the voltage-regulation at power voltage regulon 2 two ends, and then finish the dump power control of power voltage unit 2 ports in parallel.When the first full control switch VT1 conducting, ON time is t
On, the first capacitor C 1 is to energy storage inductor L1 energy storage, and energy is U
2I, when the first full control switch VT1 turn-offed, the turn-off time was t
Off, energy storage inductor L1 releases energy to the second capacitor C 2 and the second brake resistance R2 by Power Diode Pumped VD1, and the conservation of energy in the whole process draws formula and is: U
2It
On=(U
0-U
2) It
OffThis unit input and output voltage relational expression is:
Definition
Wherein β is the duty ratio of full control switch, and T opens and the cycle of turn-offing the molar behavior process for full control switch.The input average current is:
Input impedance is:
Therefore, by regulating the input impedance that the first full control switch VT1 can regulating power voltage-regulation unit 2.As seen realize the adjusting of input impedance by regulating the first full control switch VT1, when the input impedance of power voltage regulon 2 and inversion end 7 output impedance sums equal the first brake resistance R1, the dump power that inversion end 7 dc buss transmit between age at failure is maximum, therefore steady DC bus-bar voltage has been finished the fault traversing process simultaneously.
Described full-bridge brake unit 3 comprises full bridge rectifier, the 3rd brake resistance R3 and the second full control switch VT2, wherein, full bridge rectifier is connected in parallel on the AC bus of flexible DC power transmission system inversion end, the output of full bridge rectifier connect the 3rd brake resistance R3 and the second full control switch VT2; When the AC generation line voltage of inversion end fell fault, control unit 5 controls the second full control switch VT2 closed and closes, and fault current flows through the 3rd brake resistance R3, and consumes the dump power that enters full-bridge brake unit 3.The 3rd brake resistance R3 is high-power resistance, resistance 2 Ω.
In the present embodiment, detecting unit 4 adopt the high voltage direct current isolation transformers with
The anti-fouling type voltage transformer detects DC side busbar voltage and the AC busbar voltage of flexible DC power transmission system inversion end 7 in real time, and the input of the output connection control unit 5 of detecting unit 4 sends detection signal to control unit 5.
In the present embodiment, the programmable control unit that control unit 5 adopts take embedded control chip DSP28335 as core, judge according to the detection signal of detecting unit 4 whether three phase network 8 breaks down, the control end of control unit 5 links to each other with the control end of direct current diverter switch S1, the first full control switch VT1 and the second full control switch VT2; When breaking down, control unit 5 generation direct current diverter switch S1 cut-off the pwm power regulated voltage signal of signal, the first full control switch VT1, the pass of the second full control switch VT2 is closed signal, and sent respectively the control signal that generates to changeable brake resistance unit 1, power voltage regulon 2, full-bridge brake unit 3.
Adopting above-mentioned flexible DC power transmission system electric network fault to pass through control device carries out flexible DC power transmission system electric network fault and passes through as follows and carry out:
Step 1: detecting unit detects DC side busbar voltage and the AC busbar voltage of flexible DC power transmission system inversion end in real time;
Step 2: the signal that detects is carried out the AD conversion, and the digital signal after the conversion is sent into control unit;
Step 3: judge whether this signal is fault-signal, be execution in step 4 then, otherwise return step 1;
Judge whether detection signal is fault-signal, specific as follows: the power that instant of failure flexible DC power transmission system carries is greater than the power of instant of failure inversion end output, the difference power that two power directly produce forms dump power, cause DC bus-bar voltage to rise rapidly, if detecting unit detects the DC bus-bar voltage U of inversion end
1〉=2U
Dc(U
DcBe DC bus-bar voltage before the fault) and the AC busbar voltage U of inversion end
Abc≤ 0.1U
Abc(U
AbcBe inversion end AC bus voltage value before the fault), the AC that then is judged as flexible DC power transmission system inversion end line voltage occurs and falls fault, at this moment execution in step 4;
Step 4: control unit generates the pass of direct current diverter switch cut-off signal, the second full control switch and closes signal, the first complete pwm control signal of controlling switch;
DC bus-bar voltage during fault and electric current pass through input voltage and the input current of control device as flexible DC power transmission system electric network fault, enter changeable brake resistance unit, when the direct current diverter switch disconnects, this dc bus input current is by the first brake resistance, discharge a part of power in the first brake resistance, dump power ingoing power voltage-regulation unit, control unit sends pwm control signal control the first full control switch conduction, the first electric capacity is to the energy storage inductor energy storage, thereby consume a part of power, dump power is as the output signal of power voltage regulon, export the AC of inversion end to through the inversion end, full control switch closed and closed this moment second, through the dump power of inversion end output the 3rd brake resistance of flowing through, consumed a part of dump power.
Step 5: flexible DC power transmission system electric network fault passes through the input voltage U of control device during according to the real-time fault that detects
1With the DC side busbar voltage U that regulates through power voltage
2, dynamically judge
Whether equation is set up, and the equation then execution in step 6 that is false is set up and then continued circulation execution in step 5;
Step 6: to the DC side busbar voltage U that regulates through power voltage
2Carry out the PI regulating and controlling, calculate the PWM duty ratio, and the output pwm control signal is dynamically kept
The maximum that realizes dump power discharges;
When
The time, U2 carries out the PI regulating and controlling to DC side bus feedback voltage: set-point
With dc bus feedback voltage value U
2Make comparisons, regulate through the proportional integral link, calculate and definite duty ratio β that regulates, output has the PWM control command of β duty ratio and carries out voltage U to the first full switch (VT1) of controlling
2Regulate, with
For regulating benchmark, realize Dynamic Regulating Process U
2↑ → R
In↑ → Δ P ↑ → U
1↓ → U
2↓ (R wherein
InBe U
2The input resistance of port, the dump power of Δ P for discharging), constantly keep
Keep the maximum release of dump power Δ P, thereby finish in the failure process, the system in the guaranteed output uneven situation of moment normally moves, and reaches the fault traversing requirement.
Step 7: detecting unit detects fault-signal and disappears execution in step 8;
Step 8: control unit sends control signal out of service to changeable brake unit and full-bridge brake unit, send pwm pulse lock-in control signal to the power voltage regulon, make the direct current diverter switch closed, the first full control switch and the second full control switch disconnect;
Step 9: finish fault traversing.
Claims (8)
1. a flexible DC power transmission system electric network fault passes through control device, comprise: control unit (5), detecting unit (4) is characterized in that: also comprise changeable brake resistance unit (1), power voltage regulon (2) and full-bridge brake unit (3);
Changeable brake resistance unit (1): be used for the device that first order power discharges is carried out in the output of rectifier terminal;
Power voltage regulon (2): be used for the device that second level power discharges is carried out in the output of changeable brake resistance unit;
Full-bridge brake unit (3): be used for the device that third level power discharges is carried out in the output of inversion end;
Wherein, connect with the dc bus of flexible DC power transmission system inversion end in changeable brake resistance unit (1), power voltage regulon (2) is in parallel with the dc bus of flexible DC power transmission system inversion end, full-bridge brake unit (3) is in parallel with the ac bus of flexible DC power transmission system inversion end, and the output of changeable brake resistance unit (1) connects the input of power voltage regulon (2), the input of full-bridge brake unit (3) connects the output of inversion end (7), two control ends of detecting unit (4) connect the output of flexible DC power transmission system's rectifier terminal (6), two control ends connect the input of inversion end (7), and other three outputs connect the input of electrical network.
2. flexible DC power transmission according to claim 1 system electric network fault passes through control device, it is characterized in that: described changeable brake resistance unit comprises direct current diverter switch and the first brake resistance, and the two parallel connection, by making the direct current diverter switch be in off-state, make the first brake resistance conducting, carry out power and discharge.
3. flexible DC power transmission according to claim 1 system electric network fault passes through control device, it is characterized in that: described power voltage regulon (1) comprises the first electric capacity, the second electric capacity, energy storage inductor, the first full control switch, Power Diode Pumped and the second brake resistance, the positive pole of the first electric capacity connects respectively the output of changeable brake resistance unit (1) and an end of energy storage inductor, the negative pole of the first electric capacity is connected to dc bus, the other end of energy storage inductor connects respectively an end of Power Diode Pumped one end and the first full control switch, the other end of Power Diode Pumped connects respectively an end of the second brake resistance and an end of the second electric capacity, the other end of the second electric capacity connects respectively the other end of the second brake resistance and the other end of the first full control switch, and the negative pole of the first electric capacity connects the other end of the first full control switch.
4. flexible DC power transmission according to claim 3 system electric network fault passes through control device, it is characterized in that: the described first full control switch makes this switch be in dynamic conducting state and carries out power by the instruction of control duty ratio to discharge.
5. flexible DC power transmission according to claim 1 system electric network fault passes through control device, it is characterized in that: described full-bridge brake unit (3) comprises full bridge rectifier, the 3rd brake resistance and the second full control switch, wherein, full bridge rectifier is connected in parallel on the AC bus of flexible DC power transmission system inversion end, the output of full bridge rectifier connect the 3rd brake resistance and the second full control switch.
6. flexible DC power transmission according to claim 5 system electric network fault passes through control device, it is characterized in that: the described second full control switch, be in conducting state by making this switch, and carry out power and discharge.
7. flexible DC power transmission according to claim 1 system electric network fault passes through control device, it is characterized in that: described detecting unit (4) is used for detecting in real time DC side busbar voltage and the AC busbar voltage of flexible DC power transmission system's inversion end (7).
8. flexible DC power transmission according to claim 1 system electric network fault passes through control device, it is characterized in that: described control unit by to changeable brake resistance unit (1), power voltage regulon (2) and full-bridge brake unit (3) transmit control signal, and realizes power adjustments.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220396831 CN202759233U (en) | 2012-08-10 | 2012-08-10 | Power grid fault ride-through control device for flexible DC transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220396831 CN202759233U (en) | 2012-08-10 | 2012-08-10 | Power grid fault ride-through control device for flexible DC transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820646A (en) * | 2012-08-10 | 2012-12-12 | 沈阳工业大学 | Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system |
| CN107193221A (en) * | 2017-07-27 | 2017-09-22 | 南方电网科学研究院有限责任公司 | A kind of flexible direct current transmission converter valve analogue system and method |
| CN108418239A (en) * | 2018-04-26 | 2018-08-17 | 南方电网科学研究院有限责任公司 | Flexible direct current power transmission system Poewr control method and device |
| CN110635672A (en) * | 2019-09-27 | 2019-12-31 | 杭州电子科技大学 | Frequency converter high voltage ride through method based on direct current side voltage division |
| CN111654051A (en) * | 2020-05-21 | 2020-09-11 | 东南大学 | Direct current fault ride-through control method suitable for mixed MMC |
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2012
- 2012-08-10 CN CN 201220396831 patent/CN202759233U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820646A (en) * | 2012-08-10 | 2012-12-12 | 沈阳工业大学 | Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system |
| CN102820646B (en) * | 2012-08-10 | 2014-08-20 | 沈阳工业大学 | Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system |
| CN107193221A (en) * | 2017-07-27 | 2017-09-22 | 南方电网科学研究院有限责任公司 | A kind of flexible direct current transmission converter valve analogue system and method |
| CN107193221B (en) * | 2017-07-27 | 2023-11-07 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission converter valve simulation system and method |
| CN108418239A (en) * | 2018-04-26 | 2018-08-17 | 南方电网科学研究院有限责任公司 | Flexible direct current power transmission system Poewr control method and device |
| CN108418239B (en) * | 2018-04-26 | 2021-02-02 | 南方电网科学研究院有限责任公司 | Power control method and device for flexible direct current transmission system |
| CN110635672A (en) * | 2019-09-27 | 2019-12-31 | 杭州电子科技大学 | Frequency converter high voltage ride through method based on direct current side voltage division |
| CN111654051A (en) * | 2020-05-21 | 2020-09-11 | 东南大学 | Direct current fault ride-through control method suitable for mixed MMC |
| CN111654051B (en) * | 2020-05-21 | 2021-09-07 | 东南大学 | Direct current fault ride-through control method suitable for mixed MMC |
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