CN106058826A - Method for handling failure of alternating current side of invertor side of mixed-type direct current transmission system - Google Patents
Method for handling failure of alternating current side of invertor side of mixed-type direct current transmission system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
This invention discloses a method for handling failure of alternating current side of invertor side of mixed-type direct current transmission system. The method is characterized by comprising the following steps: steps1, detect whether a serious failure is happened in an alternating current network of the invertor side; if so, enter the step 2; the serious failure means that the failure happened in the network of the invertor side makes the positive sequence voltage of the connection part of an inversion converter station and the alternating current network less than 0.6 time of a rated voltage; step2, shift the phase of a rectification converter station to an inversion state; in other words, adjust the trigger angle of a converter valve of a thyristor of the rectifier side to be greater than 90 degrees; and step 3, the voltage source type converter of the inversion converter station triggers a single-phase valve in three phases to run straightly and simultaneously locks the other two phases of valves. By adoption of this method, the mixed-type direct current transmission system can safely and reliably pass through the serious failure of the alternating current network of the invertor side; the overvoltage of the inner capacitor of the voltage source type converter and the overvoltage of the direct current side can be limited; and after the failure of alternating current network is cleared, the mixed-type direct current transmission system can be resumed quickly and steadily.
Description
Technical Field
The invention relates to a method for processing a fault of a receiving end alternating current side of a hybrid direct current transmission system.
Background
High voltage direct current transmission systems can be divided into two types: the conventional direct current transmission system (LCC-HVDC) based on the thyristor technology and the Flexible direct current transmission system (Flexible-HVDC) based on the fully-controlled power electronic device technology have advantages and disadvantages respectively, so the hybrid direct current transmission system combining the conventional direct current transmission and the Flexible direct current transmission has an engineering application prospect, and has the advantages of small loss of the conventional direct current transmission, mature operation technology, capability of supplying power to a passive network by the Flexible direct current transmission and no commutation failure.
However, when an ac power grid connected to an inverter-side (i.e., receiving-side) voltage source converter of a hybrid dc power transmission system has a serious fault, an ac voltage drop is serious, power output at an ac side of the inverter-side converter is severely limited, and a rectifier-side converter still transmits dc power to the inverter-side according to a predetermined power reference value, at this time, input power at a dc side of the inverter-side voltage source converter is much greater than output power at the ac side, a power difference causes a serious overvoltage of an internal energy storage element, i.e., a capacitor, of the voltage source converter, and meanwhile, a serious overvoltage also occurs because the dc side voltage of the voltage source converter is the sum of voltages of a plurality of internal.
Disclosure of Invention
In order to solve the problems, the invention provides a method for processing the fault of the receiving end alternating current side of the hybrid direct current transmission system, which can ensure that the hybrid direct current transmission system safely and reliably passes through the serious fault of the alternating current power grid of the inversion side, limit the overvoltage of the internal capacitor of the voltage source converter and the overvoltage of the direct current side, and quickly and stably recover the operation of the hybrid direct current transmission system after the fault of the alternating current power grid is cleared.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a method for processing a fault on a receiving end AC side of a hybrid DC power transmission system is characterized by comprising the following steps:
step 1, detecting whether a receiving end alternating current power grid has a serious fault, and entering a step 2 if the receiving end alternating current power grid has the serious fault, wherein the serious fault refers to a fault which occurs in the receiving end power grid and enables the positive sequence voltage at the connection position of an inversion converter station and the alternating current power grid to be less than 0.6 times of rated voltage;
step 2, shifting the phase of the rectification converter station to an inversion state, and adjusting the trigger angle of the thyristor converter valve on the rectification side to be greater than 90 degrees for operation;
and 3, triggering the single-phase valve in the three-phase valve to directly operate by the voltage source type converter of the inversion converter station, and locking the other two-phase valve.
Preferably, in step 1, the inverter converter station utilizes a three-phase alternating voltage U at a connection point with an alternating current power gridA、UB、UCCalculate UposAnd if so: u shapepos≤Uref1If so, judging that the AC power grid has a serious fault, and sending a phase shift request signal to a rectifier side control system through an inter-station communication system;
wherein, UposFor positive sequence voltage, U, derived from three-phase AC voltageref1Is a set threshold value.
Preferably, Uref1For a floating threshold proportional to the pre-fault dc current, the following equation is used:
Uref1＝k*Idcpu*UN
wherein, IdcpuIs the per unit value of the DC current before the fault, UNThe rated voltage at the junction of the inverter station and the alternating current power grid is k, and k is a proportionality coefficient and can generally take a value of 0.3-0.6.
Meanwhile, in the step 1, the rectifier station judges whether the receiving end has a serious fault of the alternating current power grid by using the direct current and the voltage of the station, and when the following formula is met, the rectifier station judges that the inverse receiving end has the serious fault of the alternating current power grid:
wherein, UdcRFor rectifying the DC voltage of the converter station, IdcRIn order to rectify the direct current of the converter station,is the rate of change of the direct current,is the DC voltage change rate, L is the DC line inductance, R is the DC line resistance, UdcrefIs a set overpressure threshold value. U shapedcrefThe value is 1.1-1.3 times of the rated direct current voltage.
In the step 1, the detection method of the inversion converter station depends on an inter-station communication system between the rectification converter station and the inversion converter station, and the detection method of the rectification converter station does not depend on the inter-station communication system. If any detection method detects the fault of the receiving-end alternating current power grid, the step 2 is carried out, namely, if the rectifying converter station receives a phase shift request signal of the inverting converter station, or if the serious fault of the receiving-end power grid is detected by using the direct current voltage and the direct current of the station, the step 2 is carried out.
In the step 2, the rectifying converter station adjusts the trigger angle of the thyristor converter valve at the rectifying side to operate at more than 90 degrees, and generally can operate at 120-164 degrees. And after the rectification converter station shifts the phase, sending a phase-shifted operation signal to the inversion converter station.
After the inversion converter station judges that the receiving end AC power grid has a serious fault, a phase-shifted operation signal of the rectification converter station is received, orWhen rate of change of DC currentDirect current I with speed increasing more than or equal to set value and inverse transformation stationdcIAbsolute value is reduced to 0 and IdcIAnd if the direction is reversed, the step 3 is entered.
In the step 3, the voltage source type converter of the inversion converter station triggers any one single-phase valve in the three-phase valves to directly operate, and simultaneously locks the other two-phase valves.
And when the inversion converter station detects that the fault of the receiving-end alternating current power grid is cleared, the single-phase valve direct connection operation is cancelled, and the operation modes before the faults of the inversion converter station and the rectification converter station are recovered. Inverter converter station utilizes three-phase alternating voltage U at connection with alternating current power gridA、UB、UCCalculate the positive sequence voltage UposWhen U is formedpos≥Uref2Then, the fault of the receiving end AC power grid is judged to be cleared, wherein Uref2For a set threshold value, Uref2And taking 0.7-0.95 times of the rated voltage of the alternating current power grid.
Preferably, after the detection fault of the inversion converter station is cleared, the operation modes before the fault of the inversion converter station and the rectification converter station are recovered are as follows: firstly restoring the inversion converter station, namely canceling triggering the direct connection operation of the single-phase valve, restoring three-phase unlocking, and sending a restored three-phase unlocking operation signal to the rectification converter station; and the rectifying converter station receives a recovered three-phase unlocking operation signal sent by the inverting converter station, or detects that the direct-current voltage is recovered to be more than 0.5 times of the rated voltage, and recovers to a rectifying mode before the fault, namely, the trigger angle is less than 90 degrees to operate.
And then the inversion converter station and the rectification converter station regulate the direct-current voltage and the direct-current to the running state before the fault.
The invention has the beneficial effects that: the invention provides a method for processing a fault on a receiving end alternating current side of a hybrid direct current transmission system, wherein no matter whether a rectifying station and an inverter station are communicated normally or not, the method can ensure that the hybrid direct current transmission system can safely and reliably pass through a serious fault of an alternating current power grid on the inverter side, limit overvoltage of an internal capacitor of a voltage source converter and overvoltage of the direct current side, and after the fault of the alternating current power grid is cleared, the hybrid direct current transmission system can be rapidly and stably recovered to operate.
Drawings
Fig. 1 is a schematic diagram of a hybrid dc transmission system according to the present invention;
FIG. 2 is a schematic diagram of a 12-pulse bridge thyristor converter structure and connections to a converter transformer;
FIG. 3 is a schematic diagram of an MMC type voltage source converter configuration;
FIG. 4 is a schematic diagram of a full-bridge sub-module structure;
FIG. 5 is a schematic diagram of a full-bridge-like sub-module structure;
fig. 6 is a schematic diagram of a fault processing flow of an inverter side alternating current system of the hybrid direct current transmission system.
Detailed Description
The present invention will be better understood and implemented by those skilled in the art by the following detailed description of the technical solution of the present invention with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.
As shown in fig. 1, the hybrid dc transmission system includes a rectifying converter station connected to a transmitting-end ac power grid and an inverting converter station connected to a receiving-end ac power grid, and the rectifying converter station is connected to the inverting converter station via a dc transmission line. The rectification converter station comprises a converter transformer, a converter unit and a smoothing reactor, wherein the converter unit is connected with a transmission end alternating current power grid through the converter transformer; the inversion converter station comprises a converter transformer, a converter unit and a smoothing reactor, wherein the converter transformer of the converter unit and a receiving end alternating current power gridAnd (4) connecting. Wherein, UdcR、IdcRFor rectifying the DC voltage and DC current of the converter station, UdcI、IdcIFor inverting DC voltage and DC current, U, of converter stationsA、UB、UCFor inverting the three-phase ac voltage of the ac grid to which the converter station is connected L, R is the inductance and resistance of the dc line.
The converter transformer of the rectification converter station adopts a wiring mode of Y0the/Y/delta three-winding transformer or two transformers are respectively Y in a wiring mode0[ Delta ] and Y0a/Y two-winding transformer; the wiring mode of a converter transformer of the inversion converter station is Y0A two-winding transformer of/delta. The converter transformer is used for carrying out voltage grade conversion on three-phase alternating current provided by an alternating current system, bearing direct current bias voltage and playing a role in isolating the direct current bias voltage from entering an alternating current power grid.
As shown in fig. 2, the converter unit of the rectifying converter station may adopt a 12-pulse bridge thyristor converter, which is used for converting three-phase alternating current of a sending-end alternating current network into direct current and transmitting the direct current to the inverting converter station through a direct current transmission line, wherein each bridge arm of the converter station is connected with a plurality of thyristors in series.
As shown in fig. 3, a converter unit of the inverter converter station may adopt an MMC (modular multilevel converter), which adopts a three-phase six-leg structure, each leg is formed by cascading N sub-modules, and is connected in series with a leg reactor, N is a natural number greater than 0, the sub-modules are not limited to adopt a certain topology structure, and may be formed by cascading sub-modules of one or more different topology structures. Fig. 4 to 5 list two common sub-module topologies, which are only for convenience of describing the embodiment of the present invention, and the sub-module type in fig. 3 is not limited to these two topologies.
As shown in fig. 4, the full-bridge sub-module is composed of four IGBT transistors T1-T4, four diodes D1-D4, a capacitor C1 and a resistor R1, and the bases of the four IGBT transistors T1-T4 all receive control signals provided by external devices. The full-bridge sub-module has four operation states of positive input, negative input, direct connection and locking, and is respectively corresponding to T1 and T4 to be turned on and turned off T2 and T3, T1 and T4 to be turned off and turned on T2 and T3, T1 and T3 to be turned on and turned off T2 and T4 or T1 and T3 to be turned off and turned on T2 and T4, and T1 to T4 are all turned off.
As shown in fig. 5, the quasi-full-bridge sub-module has fewer IGBT tubes T3 than the full-bridge sub-module. The similar full-bridge submodule has three operation states of input, through and locking, and is respectively corresponding to T1, T4 conduction, T2 disconnection, T1 disconnection, T2, T4 conduction, and T1, T2 and T4 disconnection.
The rectification converter station adopts constant direct current control, and the inversion converter station adopts constant direct current voltage control and constant reactive power control. In steady state operation, the dc current and dc voltage are controlled by the rectifying converter station and the inverse converting station, respectively. An inter-station communication system is arranged between the rectification converter station and the inversion converter station to realize signal exchange between the two stations.
As shown in fig. 6, a method for processing a fault on a receiving side and an alternating current side of a hybrid direct current transmission system includes the following steps:
step 1, detecting whether a receiving end alternating current power grid has a serious fault, and entering a step 2 if the receiving end alternating current power grid has the serious fault, wherein the serious fault refers to a fault which occurs in the receiving end power grid and enables the positive sequence voltage at the connection position of an inversion converter station and the alternating current power grid to be less than 0.6 times of rated voltage;
step 2, shifting the phase of the rectification converter station to an inversion state, and adjusting the trigger angle of the thyristor converter valve on the rectification side to be greater than 90 degrees for operation;
and 3, triggering the single-phase valve in the three-phase valve to directly operate by the voltage source type converter of the inversion converter station, and locking the other two-phase valve.
And when the inversion converter station detects that the fault is cleared, the single-phase valve is deactivated to directly operate, and the inversion converter station and the rectification converter station recover the operation mode before the fault.
The following describes each step in detail:
in step 1, inverse transformation streaming station control system is utilized andthree-phase AC voltage U at AC network junctionA、UB、UCCalculate UposAnd if so: u shapepos≤Uref1If so, judging that the alternating current power grid has an alternating current fault, and sending a phase shift request signal to a rectification side control system; wherein, UposFor positive sequence voltage, U, derived from three-phase AC voltageref1For the set threshold value, the following formula is used:
Uref1＝k*Idcpu*UN
wherein, IdcpuIs the per unit value of the DC current before the fault, UNThe rated voltage at the junction of the inverter station and the alternating current power grid is k, which is a proportionality coefficient and can generally take a value of 0.3-0.6, for example, k takes a value of 0.5.
When the control system of the rectification converter station receives a phase shift request signal of the inversion control system, the trigger angle of the thyristor converter valve at the rectification side is immediately adjusted to be greater than 90 degrees, generally 120-164 degrees can be selected, and simultaneously a phase shift operation signal is sent to the inversion control system.
When the communication between the rectification converter station control system and the inverse conversion station control system fails, the rectification converter station control system cannot receive a phase shift request signal of the inverse converter station, or when the communication delay between the two stations is too large and the rectification converter station control system receives the phase shift request signal of the inverse converter station, the inverse conversion station direct-current overvoltage harms equipment safety. To avoid both cases, step 1 is performed by rectifying the direct current I of the converter stationdcRAnd a direct current voltage UdcRAnd judging whether the AC power grid at the side of the inversion converter station has serious faults or not, and judging that the AC power grid at the side of the inversion converter station has serious faults when the following formula is met:
wherein, UdcRFor rectifying the DC voltage of the converter station, IdcRIn order to rectify the direct current of the converter station,is the rate of change of the direct current,is the DC voltage change rate, L is the DC line inductance, R is the DC line resistance, UdcrefThe value of the set voltage threshold value can be between a rated value of the direct-current voltage and a designed value of the insulation overvoltage of the direct-current side equipment, and can be generally 1.1-1.3 times of the rated value of the direct-current voltage.
Once the detection criteria are met, the rectification side control system also immediately adjusts the trigger angle of the rectification side thyristor converter valve to be greater than 90 degrees (for example, 164 degrees) to operate, and simultaneously sends a phase-shifted operation signal to the inversion side control system.
And the inversion converter station control system receives a phase-shifted operation signal of the rectification converter station control system, or detects that the rectification converter station operates in a phase-shifted manner by using the direct current of the inversion station, and immediately triggers the MMC single-phase valve to directly operate and simultaneously locks the other two-phase valve. As shown in FIG. 3, the bypass operation state of all the submodules SM 1-SMn of the upper and lower bridge arms of the A phase can be triggered, and the locking operation state of all the submodules of the upper and lower bridge arms of the B phase and the C phase can be triggered.
Wherein,the method for detecting the phase-shifted operation of the rectifying converter station by using the direct current of the inverter station is to avoid that the phase-shifted operation signal of a control system of the rectifying converter station cannot be received when the communication fails, and the criterion is that the change rate of the direct current is after a certain momentGreater than a set value (taking 10 times rated direct current per second), IdcIAbsolute value is reduced to 0 and IdcIAnd reversing.
When U is turnedpos≥Uref2Then, the fault of the inversion converter station is judged to be cleared, wherein Uref2The set threshold value can be 0.7-0.95 times of the rated voltage of the alternating current power grid generally. And when detecting that the alternating current fault is cleared, the inverter station control system cancels and triggers the direct operation of the A-phase valve, namely all the submodules of the upper bridge arm and the lower bridge arm of the A-phase are converted into a locked operation state from a bypass operation state, and then enters a recovery logic.
The method comprises the following steps that an inverter station unlocking valve sends a running recovery signal to a rectification converter station control system; and the rectifying converter station control system receives a recovery operation signal of the inverting converter station control system, or detects that the direct-current voltage of the station is recovered, adjusts the trigger angle of the thyristor to be less than 90 degrees to operate, and enters a normal rectifying operation mode. The operation mode before the fault recovery of the inverter station and the rectifier station is as follows: the direct current of the rectifier station is controlled, and the inverter converter station adopts constant direct current voltage control and constant reactive power control. And the control systems of the two stations adjust the running state of the hybrid direct-current transmission system before the fault is recovered.
The invention provides a method for processing a fault on a receiving end alternating current side of a hybrid direct current transmission system, wherein no matter whether a rectifying station and an inverter station are communicated normally or not, the method can ensure that the hybrid direct current transmission system can safely and reliably pass through a serious fault of an alternating current power grid on the inverter side, limit overvoltage of an internal capacitor of a voltage source converter and overvoltage of the direct current side, and after the fault of the alternating current power grid is cleared, the hybrid direct current transmission system can be rapidly and stably recovered to operate.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for processing a fault on a receiving end AC side of a hybrid DC power transmission system is characterized by comprising the following steps:
step 1, detecting whether a receiving end alternating current power grid has a serious fault, and entering a step 2 if the receiving end alternating current power grid has the serious fault, wherein the serious fault refers to a fault which occurs in the receiving end power grid and enables the positive sequence voltage at the connection position of an inversion converter station and the alternating current power grid to be less than 0.6 times of rated voltage;
step 2, shifting the phase of the rectification converter station to an inversion state, namely adjusting the trigger angle of a thyristor converter valve at the rectification side to be greater than 90 degrees for operation;
and 3, triggering the single-phase valve in the three-phase valve to directly operate by the voltage source type converter of the inversion converter station, and locking the other two-phase valve.
2. The method for processing the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 1, wherein when the inversion converter station detects that the fault is cleared, the single-phase valve direct connection operation is deactivated, and the operation modes of the inversion converter station and the rectification converter station before the fault are recovered.
3. The method for processing the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 1, wherein in the step 1, the method for detecting whether the serious fault occurs in the alternating current power grid of the receiving end comprises the following steps: inverter converter station utilizes three-phase alternating voltage U at connection with alternating current power gridA、UB、UCCalculate the positive sequence voltage UposAnd if so: u shapepos≤Uref1If so, judging that the receiving end alternating current power grid has a serious fault, and sending a phase shift request signal to the rectifying converter station;
wherein, Uref1For a set threshold value, Uref1For a floating threshold proportional to the pre-fault dc current, the following equation is used:
Uref1＝k*Idcpu*UN
wherein, IdcpuIs the per unit value of the DC current before the fault, UNThe rated voltage at the junction of the inverter station and the alternating current power grid is k, and the value of k is 0.3-0.6.
4. The method for processing the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 1, wherein in the step 1, the method for detecting whether the serious fault occurs in the alternating current power grid of the receiving end comprises the following steps: the rectification converter station judges whether the receiving end alternating current power grid has a serious fault or not by using the direct current and the voltage of the station, and when the following formula is met, the receiving end alternating current power grid is judged to have the serious fault:
wherein, UdcRFor rectifying the DC voltage of the converter station, IdcRIn order to rectify the direct current of the converter station,is the rate of change of the direct current,is the DC voltage change rate, L is the DC line inductance, R is the DC line resistance, UdcrefIs a set voltage threshold.
5. The method for handling the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 4, wherein U isdcrefIs 1.1 to 1.3 times of the rated value of the direct current voltage.
6. The method for processing the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 1, wherein after the inversion converter station judges that the alternating current grid of the receiving end has a serious fault, when the change rate of the direct current is higher than a preset valueDirect current I with speed increasing more than or equal to set value and inverse transformation stationdcIAbsolute value is reduced to 0 and IdcIAnd if the direction is reversed, the step 3 is entered.
7. The method according to claim 1, wherein when U is detected, the method is used for processing the fault at the ac side of the receiving end of the hybrid direct current transmission systempos≥Uref2Then, the fault of the inversion converter station is judged to be cleared, wherein Uref2For a set threshold value, UposAccording to the three-phase alternating voltage U at the connection part of the inversion converter station and the alternating current networkA、UB、UCThe calculated positive sequence voltage; and entering recovery logic after the inversion converter station detects that the fault is cleared.
8. The method for handling the fault on the alternating current side of the receiving end of the hybrid direct current transmission system according to claim 7, wherein U isref2Is 0.7-0.95 times of the rated voltage of the alternating current power grid.
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| CN106998075A (en) * | 2017-05-26 | 2017-08-01 | 云南电网有限责任公司电力科学研究院 | Suppress the method and system of the 12 pulsation follow-up commutation failures of inverter of IGCT |
| CN107991583A (en) * | 2017-12-29 | 2018-05-04 | 南京南瑞继保电气有限公司 | Flexible direct-current transmission system converter station exchanges outlet fault distinguishing method and system |
| CN108199402A (en) * | 2017-12-08 | 2018-06-22 | 国网青海省电力公司 | A kind of DC transmission system commutation failure fault recovery method |
| CN108258664A (en) * | 2018-01-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of Hybrid HVDC system failure processing unit and fault handling method |
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