CN108279378B - Steady-state test device and method for modular multi-level converter valve - Google Patents
Steady-state test device and method for modular multi-level converter valve Download PDFInfo
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- CN108279378B CN108279378B CN201711477020.8A CN201711477020A CN108279378B CN 108279378 B CN108279378 B CN 108279378B CN 201711477020 A CN201711477020 A CN 201711477020A CN 108279378 B CN108279378 B CN 108279378B
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Abstract
The invention provides a steady-state test device and a steady-state test method for a modular multi-level converter valve. The steady-state test method provided by the invention realizes the steady-state test of the modular multi-level converter valve by unlocking or locking the auxiliary valve and the test valve in the charging stage and the test stage and charging the support capacitors in the auxiliary valve and the test valve in different stages; the invention charges and supplements energy for the support capacitor in the auxiliary valve only through N output interfaces arranged on the direct current power supply, and does not need to separately arrange another direct current power supply to charge the support capacitor in the test valve, so that the cost of the whole test circuit is lower, and the invention can completely reproduce the actual operation condition of the modular multilevel converter valve.
Description
Technical Field
The invention relates to
Background
Compared with alternating current transmission and traditional direct current transmission, flexible direct current transmission has unique advantages in operation performance. With the continuous development of the technology of the modularized multi-level flexible direct current transmission converter valve, the steps of flexible direct current transmission engineering and flexible direct current transmission network construction are also accelerated. As one of core devices of the modular multilevel flexible direct current transmission, the performance of the flexible direct current transmission converter valve determines the operational reliability and stability of the flexible direct current transmission system, and therefore, ensuring the reliability of the modular multilevel flexible direct current transmission converter valve (i.e., the modular multilevel converter valve) becomes one of necessary measures for ensuring the reliability of the flexible direct current transmission system.
The minimum functional unit of the modular multi-level converter valve is a sub-module, so that the safe and stable operation of the flexible direct-current transmission system is equivalent to that each sub-module unit can bear the electrical stress of the flexible direct-current transmission system under the actual working condition and can stably and reliably operate under the electrical stress. Therefore, the steady-state test of each submodule is an essential key link in the production process of the flexible direct-current transmission submodule. In the prior art, two direct current power supplies are often arranged for a steady-state test of the modular multi-level converter valve, namely a charging direct current power supply and an energy supplementing direct current power supply, and both the charging direct current power supply and the energy supplementing direct current power supply are provided with only one output interface. The energy supplementing direct-current power supply is connected with a support capacitor of the auxiliary valve low-voltage terminal module and used for supplementing active loss to the test circuit; the charging direct current power supply is used for charging all capacitors in the test loop, so that the auxiliary valve and the test valve establish a test voltage for triggering unlocking. Because the number of sub-modules in the auxiliary valve and the test sample valve is large, the active loss of a test loop is large, and therefore the requirement on the power output capacity of the energy supplementing direct-current power supply is high. In the prior art, the current alternating current component and the current direct current component of the load reactor cannot be completely decoupled, so that the current alternating current component and the current direct current component of the load reactor cannot be controlled independently. And the current harmonic content of the load reactor is large, the difference between the current harmonic content and the actual operation condition of the modular multilevel converter valve is large, and the actual operation condition of the modular multilevel converter valve cannot be completely reproduced.
Disclosure of Invention
In order to overcome the defects that the current alternating current component and the current direct current component of a load reactor in the prior art cannot be controlled independently and the actual operation condition of the modular multilevel converter valve cannot be reproduced completely, the invention provides a steady-state test device and a method of the modular multilevel converter valve, wherein the steady-state test device comprises the load reactor, a test product valve and an auxiliary valve which are connected through the load reactor, a water cooling device for providing cooling water for the auxiliary valve and the test product valve, a direct current power supply for charging a support capacitor in the auxiliary valve, a control device for sending an unlocking command and a locking command to the auxiliary valve and the test product valve through optical fibers and controlling the phase angle of the output voltage of the auxiliary valve and the test product valve and the output voltage of the direct current power supply, and a protection device for protecting the steady-state test device when the steady-state test device fails, and the auxiliary valve and the test product valve are unlocked or locked and controlled in the charging stage and the test stage, the steady-state test of the modular multi-level converter valve is realized, and the actual operation condition of the modular multi-level converter valve can be completely reproduced.
The current AC component and the current DC component of the load reactor can be completely decoupled
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a steady-state test device of a modular multilevel converter valve, which comprises a load reactor, a test sample valve, an auxiliary valve, a water cooling device, a direct-current power supply, a control device and a protection device, wherein the test sample valve and the auxiliary valve are connected through the load reactor;
the water cooling device is used for providing cooling water for the auxiliary valve and the test sample valve;
the direct current power supply is used for charging a supporting capacitor in the auxiliary valve;
the control device is used for sending an unlocking command and a locking command to the auxiliary valve and the sample valve through optical fibers and controlling the phase angle of the output voltage of the auxiliary valve and the output voltage of the sample valve and the output voltage of the direct-current power supply;
and the protection device is used for protecting the steady-state test device when the steady-state test device fails.
The auxiliary valve and the sample valve respectively comprise N sub-modules which are connected in series;
the high-voltage end outgoing line of a first submodule in the auxiliary valve is connected with the high-voltage end outgoing line of the first submodule in the test valve through a load reactor, and the low-voltage end outgoing line of an Nth submodule in the auxiliary valve is directly connected with the low-voltage end outgoing line of the Nth submodule in the test valve.
The submodule comprises a support capacitor C, a voltage equalizing resistor R, IGBT1, an IGBT2, a diode D1 connected with the IGBT1 in an anti-parallel mode, a diode D2 connected with the IGBT2 in an anti-parallel mode, a bypass thyristor T and a bypass switch K;
the support capacitor C is connected with the voltage equalizing resistor R in parallel, the IGBT1 and the IGBT2 are connected with each other in parallel in an opposite direction through the voltage equalizing resistor R, and the bypass thyristor T and the bypass switch K are both connected with the IGBT2 in parallel.
The direct current power supply is connected with an alternating current power grid through a transformer, and a circuit breaker is arranged between the transformer and the alternating current power grid.
The direct current power supply comprises N power supply modules, wherein each power supply module comprises an AC/DC converter and a DC/DC converter;
the AC side of the AC/DC converter is connected with the secondary side of the transformer, the DC side of the AC/DC converter is connected with one side of the DC/DC converter, and the other side of the DC/DC converter is connected with the supporting capacitor in the auxiliary valve.
The steady state test device further comprises:
the measuring module is used for measuring voltage information to ground and current information of the load reactor;
the monitoring module is used for displaying state information of the water cooling device and voltage to ground information and current information of the load reactor;
and the wave recording module is used for storing the voltage to ground information and the current information of the load reactor.
The measurement module includes:
the first voltage transformer is used for measuring the voltage to ground information on the auxiliary valve side of the reactor;
the second voltage transformer is used for measuring the voltage to ground information of the reactor test sample valve side;
and the current transformer is used for measuring the current information of the load reactor.
The protection device judges the running state of the steady-state test device through the voltage information to earth and the current information of the load reactor measured by the measuring module.
The water cooling plant leads to pipe and auxiliary valve and all submodule pieces in the sample valve to be connected respectively, and it includes:
the main water pump is used for adjusting the flow and pressure of the cooling water passing through the test sample valve and the auxiliary valve;
the deionization module is used for removing ions in the cooling water and ensuring that the cooling water meets the conductivity requirement;
and the temperature control module is used for controlling the temperature of the cooling water flowing into the test sample valve and the auxiliary valve and ensuring that the temperature of the cooling water meets the test requirements.
The invention also provides a steady-state test method of the modular multi-level converter valve, which comprises a charging stage and a test stage;
the charging phase comprises:
when the auxiliary valve and the sample valve are in a locked state, all the supporting capacitors in the auxiliary valve are charged through a direct-current power supply; enabling the auxiliary valve to be unlocked, and enabling the support capacitors in the auxiliary valve to charge all the support capacitors in the test valve through the load reactor when the test valve is in a locked state continuously;
the auxiliary valve is locked through the control module, and the auxiliary valve and the test sample valve are unlocked through the control module;
when the auxiliary valve and the sample valve are both in an unlocked state, all supporting capacitors in the auxiliary valve and the sample valve are charged through a direct-current power supply;
the test phase comprises:
adjusting the phase angle difference of output voltages of the auxiliary valve and the sample valve and the modulation ratio of carrier phase shift pulse width modulation to increase the current of the load reactor to the test current of the sub-modules in the auxiliary valve and the sample valve;
and switching all sub-modules in the auxiliary valve and the test sample valve in a carrier phase-shift pulse width modulation mode.
Under auxiliary valve and sample valve all are in the shutting state, charge for all support capacitors in the auxiliary valve through DC power supply, include:
the output voltage of the direct-current power supply is controlled by the control module to gradually increase, and when the output voltage of the direct-current power supply increases to a first set threshold value of the output voltage of the direct-current power supply, all supporting capacitors in the auxiliary valve are charged.
Enabling the auxiliary valve to be unlocked and enabling the supporting capacitors in the auxiliary valve to charge all the supporting capacitors in the sample valve through the load reactor under the condition that the sample valve is continuously in the locking state comprises the following steps:
and the auxiliary valve receives an unlocking command sent by the control module and unlocks, and the support capacitors in the auxiliary valve charge all the support capacitors in the sample valve through the load reactor until the voltages at the two ends of the load reactor are balanced, so that the charging of all the support capacitors in the sample valve is finished.
Make the auxiliary valve shutting through control module to make auxiliary valve and sample valve all unblock through control module, include:
the auxiliary valve receives the locking command sent by the control module and locks, and then the auxiliary valve and the test sample valve receive the unlocking command sent by the control module and unlock simultaneously.
Under auxiliary valve and sample valve all are in the unblock state, charge for all support capacitors in auxiliary valve and the sample valve through DC power supply, include:
and when the output voltage of the direct current power supply is increased to a second set threshold value of the output voltage of the direct current power supply and the voltages at the two ends of the load reactor are balanced, all the supporting capacitors in the auxiliary valve and the sample valve are charged.
The first set threshold of the output voltage of the direct current power supply is larger than the lowest voltage for unlocking the operation of the sub-modules in the auxiliary valve and the sample valve;
and the second set threshold of the output voltage of the direct current power supply is equal to the test voltage of the sub-modules in the test valve and the auxiliary valve, and is greater than the first set threshold of the output voltage of the direct current power supply.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the steady-state test device of the modular multilevel converter valve comprises a load reactor, a test valve and an auxiliary valve which are connected through the load reactor, a water cooling device used for providing cooling water for the auxiliary valve and the test valve, a direct-current power supply used for charging a supporting capacitor in the auxiliary valve, a control device used for sending an unlocking command and a locking command to the auxiliary valve and the test valve through optical fibers and controlling the phase angle of respective output voltages of the auxiliary valve and the test valve and the output voltage of the direct-current power supply, and a protection device used for protecting the steady-state test device when the steady-state test device fails, wherein the control device is used for completely decoupling the current alternating current component and the current direct current component of the load reactor, so that the current alternating current component and the current direct current component of the load reactor can be controlled independently, and the steady-state test circuit is simple in structure;
the steady-state test method of the modular multilevel converter valve provided by the invention realizes the steady-state test of the modular multilevel converter valve by unlocking or locking the auxiliary valve and the test valve in the charging stage and the test stage and charging the support capacitors in the auxiliary valve and the test valve in different stages;
according to the technical scheme provided by the invention, the supporting capacitor in the auxiliary valve is charged and supplemented with energy only through N output interfaces arranged on the direct-current power supply, and the supporting capacitor in the test valve is charged without independently arranging another direct-current power supply, so that the cost of the whole test circuit is lower;
according to the technical scheme provided by the invention, the current harmonic content of the load reactor is low, and the actual operation condition of the modular multilevel converter valve can be completely reproduced.
Drawings
FIG. 1 is a block diagram of a steady-state testing apparatus of a modular multilevel converter valve according to an embodiment of the present invention;
FIG. 2 is a sub-module diagram in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides a steady-state test device of a modular multi-level converter valve, which has the specific structure as shown in fig. 1, wherein T1 in fig. 1 represents a transformer, K1 represents a circuit breaker, and S represents an isolating switch;
the water cooling device is used for providing cooling water for the auxiliary valve and the test sample valve;
the direct current power supply is used for charging a supporting capacitor in the auxiliary valve;
the control device is used for sending an unlocking command and a locking command to the auxiliary valve and the sample valve through optical fibers and controlling the phase angle of the output voltage of the auxiliary valve and the sample valve and the output voltage of the direct-current power supply;
the protection device is used for protecting the steady-state test device when the steady-state test device fails.
The auxiliary valve and the test sample valve respectively comprise 3 sub-modules which are connected in series, wherein a high-voltage end outgoing line of a first sub-module in the auxiliary valve is connected with a high-voltage end outgoing line of the first sub-module in the test sample valve through a load reactor, and a low-voltage end outgoing line of a 3 rd sub-module in the auxiliary valve is directly connected with a low-voltage end outgoing line of a 3 rd sub-module in the test sample valve.
As in fig. 2, the submodule includes a support capacitor C, a grading resistor R, IGBT1, an IGBT2, a diode D1 connected in anti-parallel with the IGBT1, a diode D2 connected in anti-parallel with the IGBT2, a bypass thyristor T and a bypass switch K;
the support capacitor C is connected with the voltage equalizing resistor R in parallel, the IGBT1 and the IGBT2 are connected with each other in parallel in an opposite direction through the voltage equalizing resistor R, and the bypass thyristor T and the bypass switch K are both connected with the IGBT2 in parallel.
The direct-current power supply is connected with an alternating-current power grid through a transformer, a circuit breaker is arranged between the transformer and the alternating-current power grid, the direct-current power supply comprises 3 power supply modules, and each power supply module comprises an AC/DC converter and a DC/DC converter;
the AC side of the AC/DC converter is connected with the secondary side of the transformer, the DC side of the AC/DC converter is connected with one side of the DC/DC converter, and the other side of the DC/DC converter is connected with the supporting capacitor in the auxiliary valve.
The steady-state testing device provided by the embodiment of the invention comprises a measuring module, a monitoring module and a wave recording module, and the functions of the three modules are respectively described in detail as follows:
the measuring module is used for measuring voltage information to ground and current information of the load reactor;
the monitoring module is used for displaying state information of the water cooling device, and voltage-to-ground information and current information of the load reactor;
the recording module is used for storing the voltage information to ground and the current information of the load reactor.
The measuring module comprises a first voltage transformer, a second voltage transformer and a current transformer, wherein the first voltage transformer is used for measuring the voltage-to-ground information of the auxiliary valve side of the reactor; the second voltage transformer is used for measuring the voltage to ground information of the reactor test sample valve side; the current transformer is used for measuring current information of the load reactor.
The protection device judges the running state of the steady-state test device through the voltage information to ground and the current information of the load reactor measured by the measuring module.
The water cooling device is connected with all the sub-modules in the auxiliary valve and the sample valve through water pipes respectively, and comprises:
the main water pump is used for adjusting the flow and pressure of the cooling water passing through the test sample valve and the auxiliary valve;
the deionization module is used for removing ions in the cooling water and ensuring that the cooling water meets the conductivity requirement;
and the temperature control module is used for controlling the temperature of the cooling water flowing into the test sample valve and the auxiliary valve and ensuring that the temperature of the cooling water meets the test requirements.
The embodiment of the invention also provides a steady-state test method for the modular multilevel converter valve, the steady-state test method comprises a charging stage and a test stage, and the specific processes of the two stages are respectively described in detail as follows:
1. the charging stage comprises the following specific processes:
1-1, charging all supporting capacitors in the auxiliary valve through a direct current power supply when the auxiliary valve and the sample valve are in a locked state; enabling the auxiliary valve to be unlocked, and enabling the support capacitors in the auxiliary valve to charge all the support capacitors in the test valve through the load reactor when the test valve is in a locked state continuously;
1-2, locking the auxiliary valve through the control module, and unlocking both the auxiliary valve and the sample valve through the control module;
1-3, charging all supporting capacitors in the auxiliary valve and the sample valve by a direct-current power supply when the auxiliary valve and the sample valve are both in an unlocked state;
2. the specific process of the test stage is as follows:
2-1, adjusting the phase angle difference of output voltages of the auxiliary valve and the sample valve and the modulation ratio of carrier phase shift pulse width modulation, so that the current of the load reactor is increased to the test current of the sub-modules in the auxiliary valve and the sample valve;
2-2, switching all sub-modules in the auxiliary valve and the sample valve in a carrier phase-shift pulse width modulation mode.
In the above 1-1, when the auxiliary valve and the sample valve are both in a locked state, all the support capacitors in the auxiliary valve are charged by the dc power supply, and the specific process is as follows:
the output voltage of the direct-current power supply is controlled by the control module to gradually increase, and when the output voltage of the direct-current power supply increases to a first set threshold value of the output voltage of the direct-current power supply, all supporting capacitors in the auxiliary valve are charged.
In the step 1-1, the auxiliary valve is unlocked, and when the sample valve is continuously in the locked state, the support capacitors in the auxiliary valve charge all the support capacitors in the sample valve through the load reactors, and the specific process is as follows:
and the auxiliary valve receives an unlocking command sent by the control module and unlocks, the support capacitors in the auxiliary valve charge all the support capacitors in the sample valve through the load reactor until the voltages at the two ends of the load reactor are balanced, and all the support capacitors in the sample valve are charged.
In the above 1-2, the control module is used to lock the auxiliary valve and unlock both the auxiliary valve and the sample valve, and the specific process is as follows:
the auxiliary valve receives the locking command sent by the control module and locks, and then the auxiliary valve and the test sample valve receive the unlocking command sent by the control module and unlock simultaneously.
In the above 1-3, when the auxiliary valve and the sample valve are both in the unlocked state, all the support capacitors in the auxiliary valve and the sample valve are charged by the dc power supply, and the specific process is as follows:
and when the output voltage of the direct current power supply is increased to a second set threshold value of the output voltage of the direct current power supply and the voltages at the two ends of the load reactor are balanced, all the supporting capacitors in the auxiliary valve and the sample valve are charged.
The first set threshold of the output voltage of the direct current power supply is greater than the lowest voltage for unlocking the operation of the sub-modules in the auxiliary valve and the sample valve; and the second set threshold of the output voltage of the direct current power supply is equal to the test voltage of the sub-modules in the test valve and the auxiliary valve, and the second set threshold of the output voltage of the direct current power supply is larger than the first set threshold of the output voltage of the direct current power supply.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (14)
1. A steady state test method of a modular multi-level converter valve is used, and a steady state test device of the modular multi-level converter valve used in the method comprises a load reactor, a test valve and an auxiliary valve which are connected through the load reactor, a water cooling device, a direct current power supply, a control device and a protection device;
the water cooling device is used for providing cooling water for the auxiliary valve and the test sample valve;
the direct current power supply is used for charging a supporting capacitor in the auxiliary valve;
the control device is used for sending an unlocking command and a locking command to the auxiliary valve and the sample valve through optical fibers and controlling the phase angle of the output voltage of the auxiliary valve and the output voltage of the sample valve and the output voltage of the direct-current power supply;
the protection device is used for protecting the steady-state test device when the steady-state test device fails, and is characterized by comprising a charging stage and a test stage;
the charging phase comprises:
when the auxiliary valve and the sample valve are in a locked state, all the supporting capacitors in the auxiliary valve are charged through a direct-current power supply; enabling the auxiliary valve to be unlocked, and enabling the support capacitors in the auxiliary valve to charge all the support capacitors in the test valve through the load reactor when the test valve is in a locked state continuously;
the auxiliary valve is locked through the control module, and the auxiliary valve and the test sample valve are unlocked through the control module;
when the auxiliary valve and the sample valve are both in an unlocked state, all supporting capacitors in the auxiliary valve and the sample valve are charged through a direct-current power supply;
the test phase comprises:
adjusting the phase angle difference of output voltages of the auxiliary valve and the sample valve and the modulation ratio of carrier phase shift pulse width modulation to increase the current of the load reactor to the test current of the sub-modules in the auxiliary valve and the sample valve;
and switching all sub-modules in the auxiliary valve and the test sample valve in a carrier phase-shift pulse width modulation mode.
2. The steady state testing method for the modular multilevel converter valve according to claim 1, wherein the auxiliary valve and the test sample valve each comprise N serially connected sub-modules;
the high-voltage end outgoing line of a first submodule in the auxiliary valve is connected with the high-voltage end outgoing line of the first submodule in the test valve through a load reactor, and the low-voltage end outgoing line of an Nth submodule in the auxiliary valve is directly connected with the low-voltage end outgoing line of the Nth submodule in the test valve.
3. The steady-state test method of the modular multilevel converter valve according to claim 2, wherein the sub-modules comprise a support capacitor C, a voltage-sharing resistor R, IGBT1, an IGBT2, a diode D1 connected in anti-parallel with the IGBT1, a diode D2 connected in anti-parallel with the IGBT2, a bypass thyristor T and a bypass switch K;
the support capacitor C is connected with the voltage equalizing resistor R in parallel, the IGBT1 and the IGBT2 are connected with each other in parallel in an opposite direction through the voltage equalizing resistor R, and the bypass thyristor T and the bypass switch K are both connected with the IGBT2 in parallel.
4. The steady-state testing method for the modular multilevel converter valve according to claim 1, wherein the direct current power supply is connected with an alternating current power grid through a transformer, and a circuit breaker is arranged between the transformer and the alternating current power grid.
5. The steady-state testing method for the modular multilevel converter valve according to claim 4, wherein the DC power source comprises N power modules, and the power modules comprise an AC/DC converter and a DC/DC converter;
the AC side of the AC/DC converter is connected with the secondary side of the transformer, the DC side of the AC/DC converter is connected with one side of the DC/DC converter, and the other side of the DC/DC converter is connected with the supporting capacitor in the auxiliary valve.
6. The steady-state testing method for the modular multilevel converter valve of claim 1, wherein the steady-state testing apparatus further comprises:
the measuring module is used for measuring voltage information to ground and current information of the load reactor;
the monitoring module is used for displaying state information of the water cooling device and voltage to ground information and current information of the load reactor;
and the wave recording module is used for storing the voltage to ground information and the current information of the load reactor.
7. The method of steady state testing of modular multilevel converter valves of claim 6, wherein the measurement module comprises:
the first voltage transformer is used for measuring the voltage to ground information on the auxiliary valve side of the reactor;
the second voltage transformer is used for measuring the voltage to ground information of the reactor test sample valve side;
and the current transformer is used for measuring the current information of the load reactor.
8. The steady-state testing method of the modular multilevel converter valve according to claim 6, wherein the protection device judges the operation state of the steady-state testing device according to the voltage-to-ground information and the current information of the load reactor measured by the measuring module.
9. The steady-state testing method of the modular multilevel converter valve according to claim 1, wherein the water cooling device is connected with all the sub-modules of the auxiliary valve and the sample valve through water pipes, respectively, and comprises:
the main water pump is used for adjusting the flow and pressure of the cooling water passing through the test sample valve and the auxiliary valve;
the deionization module is used for removing ions in the cooling water and ensuring that the cooling water meets the conductivity requirement;
and the temperature control module is used for controlling the temperature of the cooling water flowing into the test sample valve and the auxiliary valve and ensuring that the temperature of the cooling water meets the test requirements.
10. The steady-state testing method for the modular multilevel converter valve according to claim 1, wherein the step of charging all supporting capacitors in the auxiliary valve by the dc power supply when the auxiliary valve and the test valve are both in the locked state comprises:
the output voltage of the direct-current power supply is controlled by the control module to gradually increase, and when the output voltage of the direct-current power supply increases to a first set threshold value of the output voltage of the direct-current power supply, all supporting capacitors in the auxiliary valve are charged.
11. The steady state testing method for the modular multilevel converter valve according to claim 1, wherein the unlocking the auxiliary valve and charging all the support capacitors in the auxiliary valve through the load reactors while the test valve continues to be in the locked state comprises:
and the auxiliary valve receives an unlocking command sent by the control module and unlocks, and the support capacitors in the auxiliary valve charge all the support capacitors in the sample valve through the load reactor until the voltages at the two ends of the load reactor are balanced, so that the charging of all the support capacitors in the sample valve is finished.
12. The steady state testing method for the modular multilevel converter valve of claim 10, wherein the latching the auxiliary valve by the control module and the unlatching both the auxiliary valve and the test valve by the control module comprises:
the auxiliary valve receives the locking command sent by the control module and locks, and then the auxiliary valve and the test sample valve receive the unlocking command sent by the control module and unlock simultaneously.
13. The steady-state testing method for the modular multilevel converter valve according to claim 10, wherein all the support capacitors in the auxiliary valve and the sample valve are charged by the dc power supply when the auxiliary valve and the sample valve are both in the unlocked state, comprising:
and when the output voltage of the direct current power supply is increased to a second set threshold value of the output voltage of the direct current power supply and the voltages at the two ends of the load reactor are balanced, all the supporting capacitors in the auxiliary valve and the sample valve are charged.
14. The steady-state test method for the modular multilevel converter valve according to claim 13, wherein the first set threshold of the output voltage of the direct current power supply is greater than the lowest voltage for unlocking the operation of the sub-modules in the auxiliary valve and the test valve;
and the second set threshold of the output voltage of the direct current power supply is equal to the test voltage of the sub-modules in the test valve and the auxiliary valve, and is greater than the first set threshold of the output voltage of the direct current power supply.
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| CN201711477020.8A CN108279378B (en) | 2017-12-29 | 2017-12-29 | Steady-state test device and method for modular multi-level converter valve |
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| CN201711477020.8A CN108279378B (en) | 2017-12-29 | 2017-12-29 | Steady-state test device and method for modular multi-level converter valve |
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| CN108279378B true CN108279378B (en) | 2022-03-18 |
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| CN111026082B (en) * | 2019-12-11 | 2021-05-04 | 全球能源互联网研究院有限公司 | Converter chain, valve base controller test circuit and test method thereof |
| CN112034322A (en) * | 2020-08-17 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Overvoltage bypass test loop and test method for MMC power module thyristor |
| CN112130013A (en) * | 2020-08-31 | 2020-12-25 | 许继集团有限公司 | MMC converter valve low-pressure pressurization test system and method thereof |
| CN112345844B (en) * | 2020-09-25 | 2024-03-15 | 许继集团有限公司 | Low-voltage testing method and device for flexible direct-current converter valve |
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