CN111026082B - Converter chain, valve base controller test circuit and test method thereof - Google Patents
Converter chain, valve base controller test circuit and test method thereof Download PDFInfo
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- CN111026082B CN111026082B CN201911266158.2A CN201911266158A CN111026082B CN 111026082 B CN111026082 B CN 111026082B CN 201911266158 A CN201911266158 A CN 201911266158A CN 111026082 B CN111026082 B CN 111026082B
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- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 28
- 230000017525 heat dissipation Effects 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 9
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
Abstract
The invention provides a converter chain, a test circuit of a valve base controller of the converter chain and a test method, wherein the test circuit comprises: the device comprises a direct current auxiliary power supply, an auxiliary converter valve, a converter chain to be tested, a connecting reactor and a valve base controller. The auxiliary converter valve is used for providing voltage for the converter chain to be tested; the direct-current auxiliary power supply is used for providing voltage for the auxiliary converter valve; the connecting reactor is used for converting the output voltage of the auxiliary converter valve into current required by a test; and the control module is used for controlling unlocking or locking the auxiliary converter valve and the converter chain to be tested, the output voltage and the capacitor voltage of the auxiliary converter valve, and the direct current voltage and the output voltage of the converter chain to be tested. According to the invention, the converter chain test circuit is built through the direct-current auxiliary power supply, the auxiliary converter valve, the converter chain to be tested, the connecting reactor and the valve base controller, the operation condition of the converter chain in actual engineering is simulated, the correctness and the reliability of the converter chain and the valve base controller are ensured, and unnecessary damage to devices in actual operation is avoided.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a converter chain and a valve base controller test circuit and a test method thereof.
Background
The voltage source type current conversion chain is a topological structure formed by cascading a plurality of current conversion modules based on the fully-controlled power electronic device, and has the advantages of modular design, convenience in installation and maintenance, low harmonic content, low switching loss and the like. Generally, three single-phase current conversion chains are connected in a delta or Y mode and applied to a high-voltage power electronic device to perform continuously adjustable reactive compensation on a power system. In actual engineering, before a power electronic device based on a voltage source type converter chain is put into operation, a high-voltage test needs to be performed on a single-phase converter chain and a valve base control system thereof to ensure correctness and reliability of the single-phase converter chain and avoid unnecessary damage of devices in actual operation. In the existing simulation test, a test circuit and a test method for a voltage prototype converter chain applied to series equipment are lacked, the test circuit and the test method are used for simulating various operation conditions of the converter chain and a valve base controller thereof, and the requirements of converter chain current energy taking, direct current voltage control, charge and discharge processes, module redundancy switching and the like cannot be met.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the test circuit of the converter chain and the valve base controller thereof in the prior art cannot meet the requirements of current energy taking, direct-current voltage control, charge and discharge processes and module redundancy switching of the converter chain suitable for series equipment, so that the converter valve and the valve base controller test circuit and the test method thereof are provided.
In a first aspect, an embodiment of the present invention provides a converter chain and a valve-based controller test circuit thereof, including a dc auxiliary power supply, an auxiliary converter valve, a converter chain to be tested, a connecting reactor, and a control module, where the auxiliary converter valve is configured to provide a voltage for the converter chain to be tested; the direct-current auxiliary power supply is used for providing voltage for the auxiliary converter valve; the connecting reactor is used for converting the voltage output by the auxiliary converter valve into current required by a test; and the control module is used for controlling unlocking or locking the auxiliary converter valve and the converter chain to be tested, the output voltage of the auxiliary converter valve, the capacitance voltage of the auxiliary converter valve, the direct current voltage of the converter chain to be tested and the output voltage of the converter chain to be tested.
In one embodiment, the chain of inverters to be tested comprises: the test device comprises a plurality of to-be-tested converter chain submodules and a plurality of bypass switches, wherein the to-be-tested converter chain submodules are connected in a cascading mode and comprise a plurality of redundant to-be-tested converter chain submodules, and the redundant to-be-tested converter chain submodules are used for replacing the failed to-be-tested converter chain submodules to work when the to-be-tested converter chain submodules fail; and a bypass switch is respectively connected in parallel at two ends of each converter chain submodule to be tested and is used for switching the converter chain submodule to be tested.
In one embodiment, the converter chain and the valve base controller test circuit thereof further comprise: a measuring device for measuring a state quantity waveform in the test circuit; the monitoring device is used for monitoring the running state of the test circuit; and the wave recording device is used for recording the state quantity waveform of the test circuit.
In one embodiment, the converter chain and the valve base controller test circuit thereof further comprise: the protection device is used for cutting off or bypassing the auxiliary converter valve or the converter chain to be tested when a fault occurs in the circuit; and the heat dissipation device comprises an auxiliary converter valve heat dissipation device and a converter chain heat dissipation device to be tested, and is used for dissipating heat for the auxiliary converter valve and the converter chain to be tested.
In a second aspect, an embodiment of the present invention provides a method for testing a converter chain and a valve base controller test circuit thereof, including: the method comprises a starting stage and a testing stage, wherein the starting stage controls the output current of an auxiliary converter valve in a testing circuit to reach a preset current value or controls a converter chain to be tested to be in an energy taking state; in the test stage, after the starting stage, a valve body current energy taking test, a direct current voltage control test and a to-be-tested converter chain redundancy switching test are carried out on the test circuit.
In one embodiment, the process of controlling the output current of the auxiliary converter valve in the test circuit to reach the preset current value in the start-up stage includes the following steps: locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the capacitor voltage of the auxiliary converter valve to reach a preset voltage value; under the conditions that the auxiliary converter valve is normal in energy acquisition, normal in communication and normal in capacitor voltage of the auxiliary converter valve, a bypass switch of the converter chain to be tested is closed, the converter chain to be tested is enabled to be in a bypass state, the auxiliary converter valve, the main control of the auxiliary converter valve and the control of the auxiliary converter valve are unlocked, the output current of the auxiliary converter valve reaches a preset current value by controlling the output voltage of the auxiliary converter valve, and the auxiliary converter valve is enabled to be in a constant current source working mode.
In one embodiment, the process of controlling the test circuit to be tested to be in the energy-taking state by the starting stage in the starting stage control test circuit comprises the following steps: locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the capacitor voltage of the auxiliary converter valve to reach a preset voltage value; under the conditions that the auxiliary converter valve is normal in energy obtaining, communication and capacitor voltage of the auxiliary converter valve are normal, a bypass switch of the converter chain to be tested is closed, the converter chain to be tested is in a bypass state, the auxiliary converter valve, the main control of the auxiliary converter valve and the valve control of the auxiliary converter valve are unlocked, the output current of the auxiliary converter valve is controlled to be the energy obtaining current by controlling the output voltage of the auxiliary converter valve, and the converter chain to be tested is enabled to enter the energy obtaining state.
In an embodiment, the process of performing the valve body current energy taking test after the output current of the auxiliary converter valve is controlled to reach the preset current value in the starting stage includes the following steps: controlling the output voltage of the auxiliary converter valve to enable the converter chain to be tested to enter an energy taking state from an energy not taking state; and acquiring the energy taking current, the state quantity waveform of the test circuit and the state quantity information.
In an embodiment, the process of performing the dc voltage control test after controlling the converter chain to be tested to be in the energy-taking state in the starting stage includes the following steps: unlocking the converter chain to be tested and a valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of a converter chain device to be tested; disconnecting the bypass switch; changing the preset value of the direct-current voltage of the converter chain to be tested, controlling the unlocking time of the converter chain to be tested, stabilizing the direct-current voltage of the converter chain to be tested at different preset values of the direct-current voltage, and verifying the boosting process of the valve body.
In an embodiment, the process of performing the redundancy switching test on the converter chain to be tested after controlling the converter chain to be tested to be in the energy-taking state in the starting stage comprises the following steps: unlocking the converter chain to be tested and a valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of a converter chain device to be tested; disconnecting the bypass switch; the on-off state of a device in the converter chain to be tested is controlled, so that the direct current voltage of the converter chain to be tested is stabilized at the preset value of the direct current voltage of the converter chain to be tested; and verifying the redundancy switching function of the converter chain to be tested by setting redundancy modules in different combination modes.
The technical scheme of the invention has the following advantages:
1. according to the converter chain and the valve base controller test circuit and the test method thereof, the converter chain test circuit is built through the direct-current auxiliary power supply, the auxiliary converter valve, the converter chain to be tested, the connecting reactor and the valve base controller, the operation condition of the converter chain in actual engineering is simulated, the correctness and the reliability of building the converter chain are ensured, and unnecessary damage to devices in actual operation is avoided.
2. According to the converter chain and the valve base controller test circuit and the test method thereof, the measuring device, the monitoring device, the wave recording device, the protection device and the heat dissipation device are arranged, so that the running states of the auxiliary converter valve and the converter chain to be tested in the test process are monitored and recorded, and the real-time monitoring and protection of the test circuit are realized; the auxiliary converter valve, the converter chain to be tested and switching of the converter chain are controlled to perform simulation test on actual working conditions, so that the current of the test circuit can be stabilized at a preset current value, the test circuit and the test method are suitable for the converter chain of series equipment, and test requirements of current energy acquisition, direct-current voltage control, module redundancy switching and the like of the converter chain can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a specific example of a test circuit in an embodiment of the present invention;
FIG. 2 is a schematic diagram of another specific example of a test circuit in an embodiment of the present invention;
FIG. 3 is a schematic diagram of another specific example of a test circuit in an embodiment of the present invention;
FIG. 4 is a flowchart showing a specific example of the test method in the embodiment of the present invention;
FIG. 5 is a flow chart of another specific example of a test circuit in an embodiment of the present invention;
FIG. 6 is a flow chart showing another specific example of a test circuit in the embodiment of the present invention;
FIG. 7 is a flow chart showing another specific example of a test circuit in the embodiment of the present invention;
fig. 8 is a flowchart of another specific example of the test circuit in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a converter chain and a valve base controller test circuit thereof, which can be used for simulating the actual working condition of the converter chain, as shown in fig. 1, and include: a direct current auxiliary power supply 1, an auxiliary converter valve 2, a converter chain to be tested 3, a connecting reactor 4 and a control module 5, wherein,
and the auxiliary converter valve 2 is used for providing voltage for the converter chain 3 to be tested. In the embodiment of the present invention, the auxiliary converter valve 2 is composed of at least one auxiliary converter module based on a fully-controlled power electronic device, which is only taken as an example and is not limited thereto. The auxiliary converter valves are divided into a main auxiliary converter valve module and a standby auxiliary converter valve module, and the standby auxiliary converter valve module is used for replacing the failed main auxiliary converter valve module to work in time when the main auxiliary converter valve module fails.
And the direct-current auxiliary power supply 1 is used for supplying voltage to the auxiliary converter valve 2. In the embodiment of the invention, the dc converter valve is used for charging a capacitor in the auxiliary converter valve 2, thereby providing a working voltage for the auxiliary converter valve 2.
And the reactor 4 is connected and used for converting the voltage output by the auxiliary converter valve 2 into current required by the test. In the embodiment of the invention, as shown in fig. 2, the connecting reactor 4 is connected in series between the auxiliary converter valve 2 and the converter chain 3 to be tested, the output voltage of the auxiliary converter valve 2 is converted into the current required by the test of the converter chain 3 to be tested, and the reactance value is selected and matched according to the tolerance level of the converter chain 3 to be tested, the output voltage of the auxiliary converter valve and the test current.
And the control module 5 is used for controlling unlocking or locking of the auxiliary converter valve 2, the converter chain to be tested 3, the output voltage of the converter valve, the capacitance voltage of the auxiliary converter valve, the direct current voltage of the converter chain to be tested and the output voltage of the converter chain to be tested. In the embodiment of the invention, the control module 5 comprises an auxiliary converter valve base controller and a converter chain valve base controller to be tested, wherein the auxiliary converter valve base controller comprises an auxiliary converter valve main control, a valve control module and a module controller, and the converter chain valve base controller to be tested comprises a converter chain main control, a valve control module and a module controller to be tested, and is used for the overall control, the valve base control and the module level control of the auxiliary converter valve 2 and the converter chain 3 to be tested. The control of the auxiliary converter valve output voltage, the capacitance voltage of the auxiliary converter valve, the direct current voltage of the converter chain to be tested and the output voltage of the converter chain to be tested is realized through the control of the auxiliary converter valve base controller and the converter chain valve base controller to be tested on the test circuit.
According to the converter chain and the valve base controller test circuit thereof provided by the embodiment of the invention, the converter chain test circuit is built through the direct-current auxiliary power supply, the auxiliary converter valve, the converter chain to be tested, the connecting reactor and the valve base controller, the operation condition of the converter chain in actual engineering is simulated, the correctness and the reliability of building the converter chain are ensured, and unnecessary damage of devices in actual operation is avoided.
In a specific embodiment, as shown in fig. 3, the converter chain 3 to be tested comprises: a plurality of commutation chain submodules to be tested 31 and a plurality of bypass switches 32, wherein,
the plurality of converter chain submodules 31 to be tested are connected in a cascade mode, the converter chain submodules 31 to be tested comprise a plurality of redundant converter chain submodules to be tested, and the redundant converter chain submodules to be tested are used for replacing the failed converter chain submodules 31 to be tested to work when the converter chain submodules 31 to be tested have a fault. In the embodiment of the present invention, the to-be-tested converter chain submodule 31 is a converter module based on a fully-controlled power electronic device, and a full H-bridge topology or a half H-bridge topology may be selected, which is only given as an example and is not limited thereto. The multiple converter chain sub-modules 31 to be tested are used for performing a valve body current energy taking test, a direct current voltage control test and a converter chain redundancy switching test to be tested. The number of the redundant converter chain submodules to be tested is less than that of the plurality of converter chain submodules to be tested 31.
And a bypass switch 32 is respectively connected in parallel at two ends of each converter chain submodule 31 to be tested and is used for switching the converter chain submodule 31 to be tested. In the embodiment of the invention, as shown in fig. 2, the bypass switch 32 is an electronic power switch or a mechanical switch, and is connected in parallel to two ends of the converter chain submodule 31 to be tested, and the bypass and the input of each converter chain submodule 31 to be tested or the whole converter chain submodule 31 to be tested in the converter chain 3 to be tested are realized by controlling the on and off of the bypass switch 32, so that the converter chain redundancy switching test is performed for a valve body current energy taking test, a direct current voltage control test and a converter chain redundancy switching test to be tested.
In a specific embodiment, the converter chain and the valve base controller test circuit thereof further include:
and the measuring device is used for measuring the state quantity waveform in the test circuit. In the embodiment of the invention, the state quantity waveform comprises the state quantity waveform required by the test method of the test circuit such as the output voltage of the auxiliary converter valve, the circuit current, the direct current voltage of the converter valve to be tested and the like.
And the monitoring device is used for monitoring the running state of the test circuit. In the embodiment of the invention, the monitoring device monitors and displays the running state of the test circuit in real time, so that when the output current of the auxiliary converter valve reaches the preset current value or the converter chain 3 to be tested enters the energy taking state, the next test can be carried out in time, and information such as the direct current voltage of the converter chain to be tested, the redundant module and the like can be monitored.
And the wave recording device is used for recording the state quantity waveform of the test circuit. The embodiment of the invention is used for simulating the actual working condition of the converter chain, can test the test circuit for multiple times, and compares the test results of multiple times, so that a wave recording device is required to record and store the state quantity waveform in real time.
And the protection device is used for cutting off or bypassing the auxiliary converter valve 2 or the converter chain 3 to be tested when a fault occurs in the circuit. The embodiment of the invention is used for simulating the actual working condition of the converter chain, various accidents can occur in the actual working condition, and the protection device can cut off the fault at any time, thereby protecting the safe operation of the whole test circuit.
The heat dissipation device comprises an auxiliary converter valve heat dissipation device and a converter chain heat dissipation device to be tested, and is used for dissipating heat for the auxiliary converter valve 2 and the converter chain 3 to be tested. In the embodiment of the invention, the converter chain sub-module to be tested and the auxiliary converter valve module are included, the valve body current energy taking test, the direct current voltage control test and the converter chain redundancy switching test to be tested need to be carried out on the test circuit, and meanwhile, a large amount of heat energy is generated in the whole test process, so that a heat dissipation device needs to be arranged to dissipate heat of a test device in the test circuit.
According to the converter chain and the valve base controller test circuit thereof provided by the embodiment of the invention, the converter chain test circuit is built through the direct-current auxiliary power supply, the auxiliary converter valve, the converter chain to be tested, the connecting reactor and the valve base controller, the operation condition of the converter chain in actual engineering is simulated, the correctness and the reliability of building the converter chain are ensured, and unnecessary damage of devices in actual operation is avoided; the measuring device, the monitoring device, the wave recording device, the protecting device and the heat radiating device are arranged to monitor and record the running states of the auxiliary converter valve and the converter chain to be tested in the test process, so that the real-time monitoring and protection of the test circuit are realized; the auxiliary converter valve, the converter chain to be tested and switching of the converter chain are controlled to perform simulation test on actual working conditions, so that the current of the test circuit can be stabilized at a preset current value, the test circuit and the test method are suitable for the converter chain of series equipment, and test requirements of current energy acquisition, direct-current voltage control, module redundancy switching and the like of the converter chain can be met.
Example 2
The embodiment provides a test method of a test circuit of a converter chain and a valve base controller thereof, which comprises the following steps: controlling the output current of an auxiliary converter valve in the test circuit to reach a preset current value or controlling a converter chain to be tested to be in an energy taking state in a starting stage; in the test stage, after the starting stage, a valve body current energy taking test, a direct current voltage control test and a to-be-tested converter chain redundancy switching test are carried out on the test circuit.
In a specific embodiment, as shown in fig. 4, the process of controlling the output current of the auxiliary converter valve in the test circuit to reach the preset current value in the start-up phase includes the following steps:
step SA 1: and locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the capacitor voltage of the auxiliary converter valve to reach a preset voltage value. In the embodiment of the invention, the auxiliary converter valve is a voltage source type auxiliary converter valve, so that the auxiliary converter valve and the converter chain to be tested need to be locked before the test circuit is tested.
Step SA 2: under the conditions that the auxiliary converter valve is normal in energy acquisition, normal in communication and normal in capacitor voltage of the auxiliary converter valve, a bypass switch of the converter chain to be tested is closed, the converter chain to be tested is enabled to be in a bypass state, the auxiliary converter valve and an auxiliary converter valve base controller are unlocked, the output current of the auxiliary converter valve is enabled to reach a preset current value by controlling the output voltage of the auxiliary converter valve, and the auxiliary converter valve is enabled to be in a constant current source working mode.
In the embodiment of the invention, in order to control the converter chain to be tested to enter the energy obtaining state, under the conditions that the auxiliary converter valve is normal in energy obtaining, normal in communication and normal in voltage of the auxiliary converter valve, the bypass switch 32 is closed first, the auxiliary converter valve and the valve base controller of the auxiliary converter valve are unlocked, the output voltage of the auxiliary converter valve is controlled to reach the preset voltage value, the auxiliary converter valve and the connecting reactor act together, and the auxiliary converter valve is in the constant current source working mode. The preset current value of the auxiliary converter valve is smaller than the initial value of the energy taking current when the converter chain to be tested enters the energy taking state.
In a specific embodiment, as shown in fig. 5, the process of controlling the test circuit to be tested to be in the energy-taking state in the start-up phase includes the following steps:
step SB 1: and locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the voltage of the auxiliary converter valve to reach a preset voltage value.
Step SB 2: under the conditions that the auxiliary converter valve is normal in energy obtaining, communication and capacitor voltage of the auxiliary converter valve are normal, a bypass switch of the converter chain to be tested is closed, the converter chain to be tested is in a bypass state, the auxiliary converter valve and a valve base controller of the auxiliary converter valve are unlocked, the output current of the auxiliary converter valve is controlled to be the energy obtaining current by controlling the output voltage of the auxiliary converter valve, and the converter chain to be tested is enabled to enter the energy obtaining state. In the embodiment of the invention, the output voltage of the auxiliary converter valve can be converted into the current by controlling the output voltage of the auxiliary converter valve and connecting the reactor, so that the current reaches the preset current value.
In a specific embodiment, as shown in fig. 6, after the output current of the auxiliary converter valve is controlled to reach a preset current value in the start-up phase, a process of performing a valve body current energy taking test includes the following steps:
step SA 3: and controlling the output voltage of the auxiliary converter valve to enable the converter chain to be tested to enter an energy-taking state from an energy-taking state. In the embodiment of the invention, after the output current of the auxiliary converter valve is controlled to reach the preset current value, the output current of the auxiliary converter valve is controlled to be increased, and whether the converter chain to be tested enters an energy taking state or not is monitored by the monitoring device.
Step SA 4: and acquiring the energy taking current, the state quantity waveform of the test circuit and the state quantity information. In the embodiment of the invention, when the converter chain to be tested enters the energy taking state, the current equal state quantity value and the state quantity waveform of the circuit at the moment are recorded for reference of subsequent tests.
In a specific embodiment, as shown in fig. 7, after controlling the converter chain to be tested to be in the energy-taking state in the start-up stage, the process of performing the dc voltage control test includes the following steps:
step SB 311: and unlocking the converter chain to be tested and the valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of the converter chain device to be tested. In the embodiment of the invention, after the converter chain to be tested enters the energy obtaining state, in order to prepare to put in the converter chain to be tested, the output voltage of the converter chain to be tested needs to be controlled to be zero, and the converter chain to be tested enters the zero voltage state. As shown in fig. 2, in the embodiment of the present invention, the converter chain to be tested is based on a fully controlled device converter, so that the on/off of the bridge arm device can be controlled, and the converter chain to be tested is controlled to enter a zero voltage state.
Step SB 312: the bypass switch is opened. In the embodiment of the invention, after the monitoring device monitors that the converter chain to be tested enters the zero-voltage state, the bypass switch is disconnected, so that the output current of the auxiliary converter valve flows through the converter module of the converter valve to be tested.
Step SB 313: changing the preset value of the direct-current voltage of the converter chain to be tested, controlling the unlocking time of the direct-current voltage control of the converter chain to be tested, stabilizing the direct-current voltage of the converter chain to be tested at different preset values of the direct-current voltage, and verifying the boosting process of the valve body. In the embodiment of the invention, the direct-current voltage of the converter chain to be tested is controlled to reach different voltage values by controlling the preset value of the direct-current voltage of the converter chain to be tested and the unlocking time of the direct-current voltage control of the converter chain to be tested, so that the boosting process of the converter chain is verified.
In a specific embodiment, as shown in fig. 8, after the start-up stage controls the converter chain to be tested to be in the energy-taking state, the process of performing the redundancy switching test on the converter chain to be tested includes the following steps:
step SB 321: and unlocking the converter chain to be tested and the valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of the converter chain device to be tested.
Step SB 322: the bypass switch is opened.
Step SB 323: and the direct current voltage of the converter chain to be tested is stabilized at the preset value of the direct current voltage of the converter chain to be tested by controlling the on-off state of a device in the converter chain to be tested.
In the embodiment of the invention, the on-off state of the device in the to-be-tested converter chain submodule is controlled to enter the zero-voltage state by controlling the on-off state of the device in the to-be-tested converter chain submodule, and the on-off state of the device in the to-be-tested converter chain submodule is controlled after the bypass switch is switched off, so that the capacitor of the to-be-tested converter chain submodule is charged, and the direct-current voltage of the to-be-tested converter chain is finally stabilized at the preset value of the direct.
Step SB 324: and verifying the redundancy switching function of the converter chain to be tested by setting redundancy modules in different combination modes. In the embodiment of the invention, after the direct-current voltage of the converter chain to be tested reaches the preset value, the redundancy switching function is verified by setting different redundancy module numbers or different redundancy modules.
According to the converter chain and the valve base controller test method thereof provided by the embodiment of the invention, the converter chain test circuit is built through the direct-current auxiliary power supply, the auxiliary converter valve, the converter chain to be tested, the connecting reactor and the valve base controller, the operation condition of the converter chain in actual engineering is simulated, the correctness and the reliability of building the converter chain are ensured, and unnecessary damage of devices in actual operation is avoided; the measuring device, the monitoring device, the wave recording device, the protecting device and the heat radiating device are arranged to monitor and record the running states of the auxiliary converter valve and the converter chain to be tested in the test process, so that the real-time monitoring and protection of the test circuit are realized; the auxiliary converter valve, the converter chain to be tested and switching of the converter chain are controlled to perform simulation test on actual working conditions, so that the current of the test circuit can be stabilized at a preset current value, the test circuit and the test method are suitable for the converter chain of series equipment, and test requirements of current energy acquisition, direct-current voltage control, module redundancy switching and the like of the converter chain can be met.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (7)
1. A test circuit of a converter chain and a valve base controller thereof is characterized by comprising: a DC auxiliary power supply, an auxiliary converter valve, a converter chain to be tested, a connecting reactor and a control module,
the auxiliary converter valve is used for providing voltage for the converter chain to be tested;
the direct-current auxiliary power supply is used for providing voltage for the auxiliary converter valve;
the connecting reactor is used for converting the voltage output by the auxiliary converter valve into current required by a test;
the control module is used for controlling unlocking or locking of the auxiliary converter valve and the converter chain to be tested, the output voltage of the auxiliary converter valve, the capacitance voltage of the auxiliary converter valve, the direct current voltage of the converter chain to be tested and the output voltage of the converter chain to be tested; the control module comprises an auxiliary converter valve base controller and a converter chain valve base controller to be tested, wherein the auxiliary converter valve base controller comprises an auxiliary converter valve main control, a valve control module and a module controller;
the converter chain to be tested comprises: a plurality of commutation chain submodules to be tested and a plurality of bypass switches, wherein,
the plurality of converter chain submodules to be tested are connected in a cascading mode, each converter chain submodule to be tested comprises a plurality of redundant converter chain submodules to be tested, and the redundant converter chain submodules to be tested are used for replacing the failed converter chain submodules to be tested to work when the converter chain submodules to be tested fail;
a bypass switch is respectively connected in parallel at two ends of each converter chain submodule to be tested and used for switching the converter chain submodule to be tested;
the bypass switch is used for carrying out a valve body current energy taking test, a direct current voltage control test and a to-be-tested converter chain redundancy switching test on the converter valve body by switching the converter submodules to be tested in parallel.
2. The converter chain and valve base controller test circuit thereof according to claim 1, further comprising:
a measuring device for measuring a state quantity waveform in the test circuit;
the monitoring device is used for monitoring the running state of the test circuit;
and the wave recording device is used for recording the state quantity waveform of the test circuit.
3. The converter chain and valve base controller test circuit thereof according to claim 2, further comprising:
the protection device is used for cutting off or bypassing the auxiliary converter valve or the converter chain to be tested when a fault occurs in the circuit;
and the heat dissipation device comprises an auxiliary converter valve heat dissipation device and a converter chain heat dissipation device to be tested, and is used for dissipating heat for the auxiliary converter valve and the converter chain to be tested.
4. A test method of a converter chain and a valve base controller test circuit thereof is characterized by being applied to the converter chain and the valve base controller test circuit thereof as claimed in any one of claims 1 to 3, and the test method comprises the following steps: the method comprises a starting stage and a testing stage, wherein the starting stage controls the output current of an auxiliary converter valve in a testing circuit to reach a preset current value or controls a converter chain to be tested to be in an energy taking state; in the test stage, after the starting stage, a valve body current energy taking test, a direct current voltage control test and a to-be-tested converter chain redundancy switching test are carried out on the test circuit;
the process of controlling the converter chain to be tested in the test circuit to be in the energy obtaining state in the starting stage comprises the following steps:
locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the voltage of the auxiliary converter valve to reach a preset voltage value;
under the conditions that the auxiliary converter valve is normal in energy obtaining, communication and voltage of the auxiliary converter valve are normal, closing a bypass switch of the converter chain to be tested to enable the converter chain to be tested to be in a bypass state, unlocking the auxiliary converter valve, the main control of the auxiliary converter valve and the valve control of the auxiliary converter valve, controlling the output current of the auxiliary converter valve to be the energy obtaining current by controlling the output voltage of the auxiliary converter valve, and enabling the converter chain to be tested to enter the energy obtaining state;
the process of performing the redundancy switching test of the converter chain to be tested after controlling the converter chain to be tested to be in the energy obtaining state in the starting stage comprises the following steps:
unlocking the converter chain to be tested and a valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of the converter chain to be tested;
opening the bypass switch;
the on-off state of a device in the converter chain to be tested is controlled, so that the direct current voltage of the converter chain to be tested is stabilized at the preset value of the direct current voltage of the converter chain to be tested;
and verifying the redundancy switching function of the converter chain to be tested by setting redundancy modules in different combination modes, wherein the different combination modes comprise setting different numbers of redundancy modules or different redundancy modules.
5. The testing method of the converter chain and the valve base controller testing circuit thereof according to claim 4, wherein the process of controlling the output current of the auxiliary converter valve in the testing circuit to reach the preset current value in the starting stage comprises the following steps:
locking the auxiliary converter valve and the converter chain to be tested, unlocking the direct-current auxiliary power supply, and controlling the capacitor voltage of the auxiliary converter valve to reach a preset voltage value;
under the conditions that the auxiliary converter valve is normal in energy acquisition, normal in communication and normal in capacitor voltage of the auxiliary converter valve, closing a bypass switch of the converter chain to be tested to enable the converter chain to be tested to be in a bypass state, unlocking the auxiliary converter valve, the auxiliary converter valve main control and the auxiliary converter valve control, enabling the output current of the auxiliary converter valve to reach a preset current value by controlling the output voltage of the auxiliary converter valve, and enabling the auxiliary converter valve to be in a constant current source working mode.
6. The test method of the converter chain and the valve base controller test circuit thereof according to claim 5, wherein the process of performing the valve body current energy taking test after the output current of the auxiliary converter valve is controlled to reach the preset current value in the starting stage comprises the following steps:
controlling the output voltage of the auxiliary converter valve to enable the converter chain to be tested to enter an energy-taking state from an energy-taking state;
and acquiring the energy taking current, the state quantity waveform of the test circuit and the state quantity information.
7. The test method of the converter chain and the valve base controller test circuit thereof according to claim 4, wherein the process of the direct-current voltage control test is performed after the converter chain to be tested is controlled to be in the energy-taking state in the starting stage, and the test method comprises the following steps:
unlocking the converter chain to be tested and a valve base controller thereof, and controlling the converter chain to be tested to enter a zero-voltage state by controlling the on-off of the converter chain device to be tested;
opening the bypass switch;
and changing the preset direct-current voltage value of the converter chain to be tested, controlling the unlocking time of the direct-current voltage control of the converter chain to be tested, stabilizing the direct-current voltage of the converter chain to be tested at different preset direct-current voltage values, and verifying the boosting process of the valve body.
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