CN110729881A - Modular energy discharge submodule for optimizing bypass scheme and control protection method thereof - Google Patents
Modular energy discharge submodule for optimizing bypass scheme and control protection method thereof Download PDFInfo
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- CN110729881A CN110729881A CN201911138742.XA CN201911138742A CN110729881A CN 110729881 A CN110729881 A CN 110729881A CN 201911138742 A CN201911138742 A CN 201911138742A CN 110729881 A CN110729881 A CN 110729881A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A modularized energy discharge sub-module for optimizing a bypass scheme and a control protection method thereof are provided, wherein the discharge sub-module comprises an energy storage capacitor C and a discharge resistor R connected in parallel with the energy storage capacitor C. The energy storage capacitor C is connected in parallel with the energy storage capacitor C after being connected in series with the bleeder resistor R; a bypass switch K is also connected in parallel across the turn-off switching device T1. The discharging submodule comprises a submodule body and a discharging submodule, and is characterized by further comprising two diodes which are connected in series, wherein the negative electrode of the two diodes is connected with the positive electrode of the energy storage capacitor C after being sequentially connected in series, the positive electrode of the two diodes is connected with the negative electrode of the energy storage capacitor C, the positive electrode of the two diodes in series is the positive electrode access point of the discharging submodule, and the positive electrode of the two diodes in series, namely the negative electrode of the energy storage capacitor C, is the negative electrode. The energy dissipation resistance of the energy dissipation module after the bypass is fully utilized continuously provides energy dissipation capability for the system, energy in the system can still be dissipated after the bypass, and the availability ratio is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a modular energy discharge submodule for optimizing a bypass scheme and a control protection method thereof.
Background
The new energy is the development direction of future energy, especially development and application of large-scale offshore wind energy, and a direct-current energy discharging device is often needed in a direct-current voltage power transmission network connected with a new energy grid-connected converter, so that under the condition that an alternating-current side of an inverter side has a fault, all power transmitted on a line can be guided away within a few seconds. During the period, the system judges the fault type of the alternating current side and determines whether to put the inverter side converter into operation again.
The energy leakage device generally controls the input and the exit of the energy leakage resistor based on the switch of the power electronic device, but the power electronic device, a drive, a control panel, an optical transceiving terminal, an optical fiber and the like are all fragile elements, when a fault occurs, the energy leakage submodule is in a bypass state, the energy leakage resistor loses the function, the standby energy leakage submodule is put into use, and if all the standby energy leakage modules bypass due to the fault, the system faces the risk of forced shutdown.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a modular energy release submodule for optimizing a bypass scheme and a control protection method thereof, energy dissipation resistance of an energy release module after bypass is fully utilized to continuously provide energy release capacity for a system, energy in the system can still be released after bypass, and the availability ratio is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a modular energy bleeding sub-module for optimizing a bypass scheme includes an energy storage capacitor C and a bleeding resistor R connected in parallel with the energy storage capacitor C.
The energy storage capacitor C is connected in parallel with the energy storage capacitor C after being connected in series with the bleeder resistor R; a bypass switch K is also connected in parallel across the turn-off switching device T1.
It also includes two diodes in series: the first diode D1 and the second diode D2, the negative pole of two diodes after connecting in series is connected with the positive pole of the energy storage capacitor C, the positive pole is connected with the negative pole of the energy storage capacitor C, the middle point of the two diodes in series is the positive pole access point X1 of the bleeder sub-module, and the positive pole of the two diodes in series, namely the negative pole of the energy storage capacitor C, is the negative pole access point X2 of the bleeder sub-module.
Further, an overvoltage self-breakdown device Ty1 is connected in parallel in phase to two ends of the second diode D2. The overvoltage self-breakdown device Ty1 is selected to be an overvoltage self-breakdown thyristor or a BOD controlled self-breakdown device.
Furthermore, a first inverting diode D3 is connected in parallel to two ends of the turn-off switching device T1.
Furthermore, a second inverting diode D4 is connected in parallel to two ends of the bleeder resistor R.
Further, the turn-off switching device T1 is one of an IGBT, a MOSFET, and a thyristor.
A control method for a modularized energy discharge sub-module for optimizing a bypass scheme is characterized in that in the aspect of a control mode, the sub-module is considered to be an effective input module number or an invalid module number, the module number to be input is set to be N, and the module number of a bypass is set to be N; the system control strategy is set to: A) considering the submodule as an invalid submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of current controllable input submodules to be N, wherein the number of the actually total put energy leakage submodules is N + N, and the average voltage ratio rating of each module is reduced; B) considering the submodule as an effective submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of the current controllable input modules to be N-N, so that the number of the actually total put energy leakage submodules is N, and the average voltage of each module keeps a rated value.
In terms of protection mode, the system protection policy is set as follows: A) considering the sub-module as an invalid sub-module, and tripping the system when the current bypass number reaches the maximum redundancy module number; B) the sub-module is considered as a valid sub-module, and when the current bypass number reaches the maximum redundancy module number, the system continuously operates.
Compared with the prior art, the invention has the beneficial effects that:
the bypass switch of the invention is completely different from the conventional submodule bypass switch, the bypass switch in the common sense bypasses the whole submodule, when the fault that T1 can not be switched off occurs, the energy leakage submodule is completely bypassed, and the energy leakage resistor loses the effect. In the energy leakage submodule, a diode usually does not have a fault, even if the diode fails, the diode is in a short-circuit state, a resistor serving as a passive element usually does not have a fault, and in each device of the submodule, a controllable power electronic switch T1 usually has a fault which can not be reliably switched due to the fact that the device, a drive circuit, a control board, an optical transceiver terminal, an optical fiber and the like.
Aiming at the characteristics, the bypass switch is connected with the T1 in parallel, when the controllable power electronic switch T1 has a failure that the switch cannot be reliably switched, the T1 can be bypassed through the bypass switch K, the capacitor C, the bypass switch K and the energy leakage resistor R can be continuously leaked, and the operation of the whole energy leakage device is not influenced.
Drawings
FIG. 1 is an electrical diagram of an embodiment 1 of a modular energy bleed sub-module of an optimized bypass scheme of the present invention;
fig. 2 is an electrical diagram of a modular energy bleed-off sub-module embodiment 2 of an optimized bypass scheme of the present invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, a modular energy bleeding sub-module for optimizing a bypass scheme includes an energy storage capacitor C and a bleeding resistor R connected in parallel with the energy storage capacitor C.
The energy storage capacitor C is connected in parallel with the energy storage capacitor C after being connected in series with the bleeder resistor R; a bypass switch K is also connected in parallel across the turn-off switching device T1.
It also includes two diodes in series: the first diode D1 and the second diode D2, the negative pole of two diodes after connecting in series is connected with the positive pole of the energy storage capacitor C, the positive pole is connected with the negative pole of the energy storage capacitor C, the middle point of the two diodes in series is the positive pole access point X1 of the bleeder sub-module, and the positive pole of the two diodes in series, namely the negative pole of the energy storage capacitor C, is the negative pole access point X2 of the bleeder sub-module.
As shown in fig. 2, an overvoltage self-breakdown device Ty1 is also connected in parallel in phase across the second diode D2. The overvoltage self-breakdown device Ty1 is selected to be an overvoltage self-breakdown thyristor or a BOD controlled self-breakdown device.
A first inverting diode D3 is also connected in parallel to two ends of the turn-off switching device T1.
And a second inverting diode D4 is also connected in parallel at two ends of the bleeder resistor R.
The turn-off switching device T1 is one of an IGBT, a MOSFET, and a thyristor.
The principle of the invention is as follows:
1) the first diode D1 functions to make the current flow of the energy discharging device unidirectional, and if the energy discharging device is applied to the field of direct-current power transmission, the current flows from the direct-current positive electrode to the energy discharging device and then flows to the direct-current negative electrode. When a short circuit occurs between the layers of the current leakage device or outside a bridge arm, the second diode D2 provides a follow current path for the short-circuit current, so that the breakdown of a core device is avoided; the reverse freewheeling diodes D3 and D4 play a role in reverse freewheeling when the sub-modules are switched, and breakdown of the turn-off voltage of the devices and the resistors is avoided.
2) The bypass switch K is a mechanical bypass switch, when the IGBT breaks down, the bypass switch is triggered, and after bypassing, the charging current flows through the energy discharge submodule output end X1, flows through the D1, the energy storage capacitor C and the energy discharge resistor parallel branch circuit, and flows through the energy discharge submodule output end X2. Meanwhile, the energy leakage submodule discharges, and the energy storage capacitor C forms a discharge loop through the bypass switch and the energy leakage resistor. The energy discharge resistor is always in the on state after the bypass.
3) If an energy leakage system formed by connecting a plurality of energy leakage sub-modules in series is connected to the direct current side of a power transmission system, the energy leakage system sub-modules are not in an input state, the current flowing through the system is the loss of all the energy leakage sub-modules, including the loss of a secondary board card and the loss of a voltage-sharing resistor, the whole flowing current is dozens of milliamperes, and the resistor is generally an ohm level, so the voltage of a bypass module is very low, and the loss is not increased.
4) If the energy leakage system formed by connecting the energy leakage sub-modules in series is connected to the direct current side of the power transmission system, the energy leakage system sub-modules are in an input state, the current flowing through the system is the average energy leakage current of the energy consumption system, and the resistance of the energy consumption sub-modules of the bypass is still input into the system, so that the average voltage of all the energy consumption sub-modules is reduced.
5) Because the energy consumption resistor is in an ohm level and is much smaller than a voltage equalizing resistor in a dozen kiloohm level, voltage equalizing of the module is mainly realized by the energy consumption resistor, continuous overvoltage can not occur to the energy leakage submodule of the bypass, and meanwhile, the resistance of the energy leakage submodule of the bypass does not lose the energy leakage function due to the damage of the switch device.
6) In the control mode, considering the sub-module as the number of the effectively input modules or considering the sub-module as the number of the invalid modules, setting the number of the modules to be input as N and the number of the bypassed modules as N; the system control strategy is set to: A) considering the submodule as an invalid submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of current controllable input submodules to be N, wherein the number of the actually total put energy leakage submodules is N + N, and the average voltage ratio rating of each module is reduced; b) Considering the submodule as an effective submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of the current controllable input modules to be N-N, so that the number of the actually total put energy leakage submodules is N, and the average voltage of each module keeps a rated value.
7) In terms of protection mode, the system protection policy is set as follows: A) considering the sub-module as an invalid sub-module, and tripping the system when the current bypass number reaches the maximum redundancy module number; B) the sub-module is considered as a valid sub-module, and when the current bypass number reaches the maximum redundancy module number, the system continuously operates.
Compared with the prior art, the energy leakage submodule adopting the bypass scheme has the advantages that the change of the topological position of the bypass switch brings more than structural change and simultaneously brings principle optimization, the energy leakage function is realized after bypassing, and the energy leakage submodule is a solution with higher utilization rate.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (8)
1. A modularized energy discharge sub-module for optimizing a bypass scheme comprises an energy storage capacitor C and a discharge resistor R connected in parallel with the energy storage capacitor C;
the energy-saving switch is characterized by further comprising a turn-off switching device T1, wherein the turn-off switching device T1 is connected with the bleeder resistor R in series and then connected with the energy storage capacitor C in parallel; two ends of the turn-off switching device T1 are also connected with a bypass switch K in parallel;
it also includes two diodes in series: the first diode D1 and the second diode D2, the negative pole of two diodes after connecting in series is connected with the positive pole of the energy storage capacitor C, the positive pole is connected with the negative pole of the energy storage capacitor C, the middle point of the two diodes in series is the positive pole access point X1 of the bleeder sub-module, and the positive pole of the two diodes in series, namely the negative pole of the energy storage capacitor C, is the negative pole access point X2 of the bleeder sub-module.
2. The modular energy dump sub-module for optimizing the bypass scheme as claimed in claim 1, wherein the second diode D2 further has an overvoltage self-breakdown device Ty1 connected in parallel in phase.
3. The modular energy bleed-off submodule of the optimized bypass scheme of claim 2, wherein said overvoltage self-breakdown device Ty1 is selected to be an overvoltage self-breakdown thyristor or a BOD controlled self-breakdown device.
4. The modular energy dump sub-module for optimizing the bypass scheme as claimed in claim 1, wherein a first inverting diode D3 is further connected in parallel to two ends of the turn-off switching device T1.
5. The modular energy bleeding submodule for optimizing a bypass scheme according to claim 1, wherein a second inverting diode D4 is further connected in parallel to two ends of the bleeding resistor R.
6. The modular energy discharge submodule of the optimized bypass scheme as claimed in claim 1, wherein said turn-off switching device T1 is one of an IGBT, a MOSFET and a thyristor.
7. The method for controlling the modular energy release submodule for optimizing the bypass scheme according to claim 1, wherein in the control mode, the submodule is considered to be the number of the modules which are effectively input, or the submodule is considered to be the number of the modules which are not effective, the number of the modules which should be input is set to be N, and the number of the modules which are bypassed is set to be N; the system control strategy is set to: A) considering the submodule as an invalid submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of current controllable input submodules to be N, wherein the number of the actually total put energy leakage submodules is N + N, and the average voltage ratio rating of each module is reduced; B) considering the submodule as an effective submodule, counting the number of energy leakage submodules which should be put into the current system, and controlling to screen the number of the current controllable input modules to be N-N, so that the number of the actually total put energy leakage submodules is N, and the average voltage of each module keeps a rated value.
8. The method for controlling the modular energy release submodule for optimizing the bypass scheme as claimed in claim 7, wherein in the protection mode, the system protection strategy is set as: A) considering the sub-module as an invalid sub-module, and tripping the system when the current bypass number reaches the maximum redundancy module number; B) the sub-module is considered as a valid sub-module, and when the current bypass number reaches the maximum redundancy module number, the system continuously operates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911138742.XA CN110729881A (en) | 2019-11-20 | 2019-11-20 | Modular energy discharge submodule for optimizing bypass scheme and control protection method thereof |
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| CN201911138742.XA CN110729881A (en) | 2019-11-20 | 2019-11-20 | Modular energy discharge submodule for optimizing bypass scheme and control protection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234812A (en) * | 2020-09-27 | 2021-01-15 | 杭州长川科技股份有限公司 | Bleeder circuit, energy storage circuit, semiconductor test system and bleeder method |
| CN113746080A (en) * | 2021-09-27 | 2021-12-03 | 荣信汇科电气股份有限公司 | Chopper resistor branch circuit for energy consumption and control method thereof |
-
2019
- 2019-11-20 CN CN201911138742.XA patent/CN110729881A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234812A (en) * | 2020-09-27 | 2021-01-15 | 杭州长川科技股份有限公司 | Bleeder circuit, energy storage circuit, semiconductor test system and bleeder method |
| CN113746080A (en) * | 2021-09-27 | 2021-12-03 | 荣信汇科电气股份有限公司 | Chopper resistor branch circuit for energy consumption and control method thereof |
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Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Applicant after: Rongxin Huike Electric Co.,Ltd. Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Applicant before: RONGXIN HUIKE ELECTRIC TECHNOLOGY Co.,Ltd. |
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