CN209911505U - Device for detecting internal electrical performance of converter valve submodule - Google Patents
Device for detecting internal electrical performance of converter valve submodule Download PDFInfo
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- CN209911505U CN209911505U CN201920442823.8U CN201920442823U CN209911505U CN 209911505 U CN209911505 U CN 209911505U CN 201920442823 U CN201920442823 U CN 201920442823U CN 209911505 U CN209911505 U CN 209911505U
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Abstract
The utility model provides a detect device of inside electrical property of converter valve submodule piece, the device includes: the controller is used for controlling an alternating current power supply to be boosted through the transformer when the transformer isolating switch is controlled to be switched off and the load isolating switch is controlled to be switched off, and then the boosted alternating current power supply is output to a sub-module capacitor for charging through a loop formed by a positive electrode or a negative electrode of the power supply, a tested valve section, a diode of a valve tower or a valve hall bridge arm and a capacitor, so that the start voltage test and the withstand voltage test of the sub-module energy taking power supply are completed in sequence; when the transformer isolating switch is controlled to be closed and the load isolating switch is controlled to be disconnected, the electric quantity of the sub-module capacitor is discharged to the test load through the loop, and the sub-module IGBT turn-on and turn-off test, the bypass switch protection action function test and the energy-taking power supply locking test are completed in sequence. According to the technical scheme, the efficiency and the reliability of detecting the internal electrical performance of the converter valve sub-module are improved.
Description
Technical Field
The utility model relates to a flexible direct current transmission technical field, in particular to detect device of the inside electrical property of converter valve submodule piece.
Background
The Modular Multilevel Converter valve (MMC) adopts a controllable turn-off type power electronic device and a Pulse Width Modulation (PWM) technology, can realize independent control of active power and reactive power, can supply power to a passive network, and is a novel Multilevel Converter topological structure. The flexible direct-current power transmission system based on the modular voltage source converter valve can overcome the defects of the traditional silicon controlled direct-current power transmission and has wide application prospect in the fields of connecting a new energy power generation field (such as wind power generation, solar power generation and the like) to a power grid, supplying power to a remote load, constructing an urban load center and the like. Compared with the conventional direct current thyristor valve, the modular multilevel converter valve has the advantages of compactness, modular design, easiness in movement, installation, debugging and maintenance, convenience in expansion, realization of multi-terminal direct current transmission and the like, and becomes an indispensable important component in a future power transmission and distribution system.
The submodule of the power electronic element based on the Insulated Gate Bipolar Transistor (IGBT) is a core element of the MMC converter valve, and in the engineering installation stage, the submodule is very easily influenced by complex transportation environments such as vibration, falling, high and low temperature, humidity and the like in the process of being transported to the site, and in order to ensure that the function of the submodule of the MMC converter valve used in the flexible direct current transmission engineering is normal, the submodule of the MMC converter valve needs to be tested before being installed. In order to shorten the field installation and debugging time, a method for testing a valve section formed by connecting a plurality of sub-modules in series is mostly adopted in engineering.
At present, a plurality of launched flexible and straight projects have mature test methods in the aspect of converter valve tests, but as converter valves used in all projects have great differences in networking modes, voltage levels, equipment capacity and control strategies, mature and uniform MMC converter valve debugging technologies are lacked. The valve section test for submodule function check also has a larger improved test space, the valve section test for direct-current voltage source pressurization adopted at present has higher requirement on an rectifier bridge module and has polarity problems in wiring, and the valve section test requirement of a high-voltage large-capacity MMC converter valve cannot be met along with the improvement of voltage grade and the internal complexity of the converter valve. In order to effectively assess the electrical performance of the submodule of the MMC converter valve at the present stage and ensure that the performance of the submodule of the MMC converter valve subjected to field debugging meets all requirements, research on a modular multilevel voltage source type converter valve section test method needs to be carried out.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a detect device of the inside electric performance of converter valve submodule piece for improve efficiency and the reliability that the inside electric performance of converter valve submodule piece detected, the device includes:
the first end of the transformer is connected with an external alternating current power supply and is used for boosting the external alternating current power supply;
the first end of the transformer isolating switch is connected with the second end of the transformer, and the second end of the transformer isolating switch is grounded;
the first end of the test load is connected with the first end of the transformer isolating switch, and the second end of the test load is connected with the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm; the test load is used for receiving the discharge electric quantity of the capacitor of the submodule of the converter valve to be tested;
the first end of the load isolating switch is connected with the first end of the test load; the second end of the load isolating switch is connected with the second end of the test load and the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm;
the first end of the oscilloscope is connected with the first end of the test load and the first end of the load isolating switch, and the second end of the oscilloscope is connected with the second end of the test load, the second end of the load isolating switch and the head end and the tail end of a bridge arm of the tested valve section, the valve tower or the valve hall; the oscilloscope is used for detecting voltage in the test process;
the controller is used for controlling an external alternating-current power supply to be boosted by the transformer and then output to sub-module capacitors of the tested valve section, the valve tower or the valve hall bridge arm for charging through a loop formed by diodes and capacitors of the tested valve section, the valve tower or the valve hall bridge arm through a positive electrode or a negative electrode of the power supply when the isolation switch of the transformer is controlled to be switched off and the load isolation switch is controlled to be switched off; when the transformer isolating switch is controlled to be closed and the load isolating switch is controlled to be disconnected, the electric quantity of the sub-module capacitor is discharged to the test load through the loop, and in the discharging process, the sub-module IGBT turn-on and turn-off test, the sub-module bypass switch protection action function test and the sub-module energy-taking power supply locking test are sequentially completed according to the detection voltage of the oscilloscope; the diode is connected with the capacitor through a cathode.
Compared with the scheme that realizes the test of submodule piece electrical property through rectifier module direct current source charging to the converter valve submodule piece among the prior art, the embodiment of the utility model provides a technical scheme, the diode that utilizes converter valve submodule piece self constitutes the rectifier circuit, the step of charging is accomplished with the help of the mode of low-voltage pressurization charging valve section submodule piece, once only accomplish the submodule piece and get ability power supply start voltage test, the withstand voltage test of submodule piece, the turn-on turn-off test of IGBT, bypass switch protection action test and get ability power shutting voltage test, can fully examine submodule piece electrical property and parameter. The embodiment of the utility model provides a technical scheme can simplify the step of charging that current valve section is experimental need provide DC power supply charging submodule piece electric capacity with the help of the rectifier bridge, has avoided the contradiction that high rated voltage that a plurality of submodule pieces establish ties and the rectifier bridge module current performance is not enough that causes, has also simplified the wiring simultaneously, has reduced the wrong risk of wiring because of the polarity problem brings, has improved the efficiency and the reliability that converter valve submodule piece inside electrical property detected.
Additionally, the embodiment of the utility model provides a technical scheme easy operation, to equipment performance require lowly, and application scope is wide, not only is applicable to valve section submodule piece performance and detects, is applicable to the submodule piece performance detection of valve tower and valve room bridge arm moreover.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a four-layer valve tower structure in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device (power frequency single-phase voltage source) for detecting the internal electrical performance of a sub-module of a converter valve section in the embodiment of the present invention;
fig. 3 is a schematic diagram of a device (power frequency single-phase voltage source) for detecting the internal electrical performance of the sub-module of the converter valve section in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device (power frequency three-phase voltage source) for detecting the internal electrical performance of the sub-module of the converter valve section in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a device (power frequency single-phase voltage source) for detecting the internal electrical performance of a converter valve tower submodule in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a device (power frequency three-phase voltage source) for detecting the internal electrical performance of a converter valve tower submodule in the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a device (power frequency three-phase voltage source) for detecting the internal electrical performance of a bridge arm submodule of a converter valve in the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a converter valve submodule charged by a rectifier module direct-current power supply to achieve a submodule performance test in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Before describing the embodiments of the present invention, first, terms related to technical solutions provided by the embodiments of the present invention are described as follows.
The MMC converter valve is divided into a converter valve power module (hereinafter referred to as a submodule), a valve section, a valve layer and a valve tower structure, wherein generally 4-6 submodules form 1 valve section, 4-6 valve sections form 1 valve layer, 4-5 valve layers form 1 valve tower, and 1 bridge arm of a valve hall in a converter station generally comprises 2 valve towers. Fig. 1 shows a valve tower structure designed by a certain manufacturer, which has 4 layers, each layer is composed of 6 valve sections, and each valve section is composed of 6 sub-modules. According to structural analysis, the converter valve submodule is the minimum unit of the converter valve, the submodule consisting of a power electronic element IGBT and an anti-parallel diode thereof is a core element of the converter valve, the electrical performance of the submodule directly influences the overall function of the converter valve, and the converter valve is easily influenced by complex transportation environments such as vibration, falling, high and low temperature, humidity and the like in the process of transportation to the site.
The inventor finds that: in the prior art, the converter valve submodule is charged by the rectifier module direct-current power supply to realize the performance test of the submodule, as shown in fig. 8, a direct-current power supply and a rectifier bridge module are needed during the test, and a large number of submodules are connected in series to form high voltage, so that the rated parameters of the existing rectifier bridge module are difficult to match, and meanwhile, the test wiring has the risk of wiring errors due to the polarity problem.
Therefore, in view of the above technical problems, the inventor proposes a charging scheme for realizing capacitor charging of a submodule by using a diode rectifying circuit of an MMC converter valve submodule, the charging scheme simplifies a charging circuit, reduces requirements of charging equipment, improves operability of a charging step, and has a wide application range. The valve section test based on the charging scheme is used for checking the internal electrical performance of the converter valve submodule, five types of test items including a submodule energy-taking power supply starting voltage test, a submodule voltage-withstanding test, an IGBT (insulated gate bipolar translator) switching-on and switching-off test, a bypass switch protection action test and an energy-taking power supply blocking voltage test can be completed in the complete test process, the submodule performance check is complete, the test operation is flexible and simple, and the valve section test based on the charging scheme can be popularized and applied to submodule performance tests taking a valve tower and a bridge arm as a unit. The following describes the scheme for detecting the internal electrical performance of the converter valve sub-module in detail.
Fig. 2 is the embodiment of the utility model provides an in the embodiment of the structure schematic diagram of the device of detecting the inside electrical performance of converter valve section submodule piece, as shown in fig. 2, the device includes:
a transformer T, the first end of which is connected with an external alternating current power supply AC and is used for boosting the external alternating current power supply;
a first end of the transformer isolating switch K1 is connected with a second end of the transformer T, and a second end of the transformer isolating switch K1 is grounded;
a first end of the test load R is connected with a first end of the transformer isolating switch K1, and a second end of the test load R is connected with the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm; the test load is used for receiving the discharge electric quantity of the capacitor of the submodule of the converter valve to be tested;
a load isolation switch K2, a first end of which is connected with a first end of the test load R; the second end of the load isolating switch K2 is connected with the second end of the test load R and the head and tail ends of a valve section to be tested, a valve tower or a valve hall bridge arm;
the first end of the oscilloscope L is connected with the first end of the test load R and the first end of the load isolating switch K2, and the second end of the oscilloscope L is connected with the second end of the test load R, the second end of the load isolating switch K2 and the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm; the oscilloscope is used for detecting voltage in the test process;
the controller is used for controlling an external alternating-current power supply to be boosted through the transformer and then output to sub-module capacitors of the tested valve section, the valve tower or the valve hall bridge arm for charging through a loop formed by a positive electrode or a negative electrode of the power supply, diodes of the tested valve section, the valve tower or the valve hall bridge arm and capacitors when the isolation switch of the transformer is controlled to be switched off and the load isolation switch is controlled to be switched off, and the sub-module energy-taking power supply starting voltage test and the sub-module voltage withstanding test are sequentially completed according to the detection voltage of the oscilloscope in the charging process; when the transformer isolating switch is controlled to be closed and the load isolating switch is controlled to be disconnected, the electric quantity of the sub-module capacitor is discharged to the test load through the loop, and in the discharging process, the sub-module IGBT turn-on and turn-off test, the sub-module bypass switch protection action function test and the sub-module energy-taking power supply locking test are sequentially completed according to the detection voltage of the oscilloscope; the diode is connected with the capacitor through a cathode.
Compared with the scheme that realizes the test of submodule piece electrical property through rectifier module direct current source charging to the converter valve submodule piece among the prior art, the embodiment of the utility model provides a technical scheme, the diode that utilizes converter valve submodule piece self constitutes the rectifier circuit, the step of charging is accomplished with the help of the mode of low-voltage pressurization charging valve section submodule piece, once only accomplish the submodule piece and get ability power supply start voltage test, the withstand voltage test of submodule piece, the turn-on turn-off test of IGBT, bypass switch protection action test and get ability power shutting voltage test, can fully examine submodule piece electrical property and parameter. The embodiment of the utility model provides a technical scheme can simplify the step of charging that current valve section is experimental need provide DC power supply charging submodule piece electric capacity with the help of the rectifier bridge, has avoided the contradiction that high rated voltage that a plurality of submodule pieces establish ties and the rectifier bridge module current performance is not enough that causes, has also simplified the wiring simultaneously, has reduced the wrong risk of wiring because of the polarity problem brings, has improved the efficiency and the reliability that converter valve submodule piece inside electrical property detected.
Additionally, the embodiment of the utility model provides a technical scheme easy operation, to equipment performance require lowly, and application scope is wide, not only is applicable to valve section submodule piece performance and detects, is applicable to the submodule piece performance detection of valve tower and valve room bridge arm moreover.
In a specific implementation, the diode may be the freewheeling diode 11 in fig. 2, the freewheeling diode 11 is a diode connected in anti-parallel to two ends of the IGBT, and the freewheeling diode 11 and the IGBT together form a switching unit. The crimp-packaged thyristor 55 in fig. 2 is a protection arrangement for protecting a freewheeling diode, represented by freewheeling diode 11, in the event of a short-circuit fault in the dc bus of the converter valve.
In practical implementation, the controller is not shown in fig. 2, and may be a separate controller, or may be integrated in an existing converter valve control device. The utility model discloses protect modified framework, the break-make of the control switch that this controller relates to or with predetermine the voltage value compare wait the method can realize with current method. The method for performing the related test can also be implemented by the existing method, please refer to the description of the specific embodiment below.
In addition, the dashed box in fig. 2 includes an enlarged illustration of one sub-module unit.
The embodiment of the utility model provides a test scheme for MMC converter valve submodule piece functional characteristic is applicable to the valve block and tests, the valve tower is experimental and the electric properties of the submodule piece of bridge arm detects to the valve block test is the example, introduces the utility model provides a technical scheme as follows:
when the power frequency alternating current power supply is specifically implemented, preparation is carried out before a test, and an isolation guardrail is arranged in a test field to confirm that the power frequency alternating current power supply with reliable wiring is available. The test wiring is carried out according to the attached figure 2, and meanwhile, a resistance-capacitance voltage divider (not shown in the figure) is connected to the head end and the tail end of a tested valve section (composed of sub modules connected in series), namely between the midpoint of a phase unit connected with a lead 1 and the midpoint of a phase unit connected with a lead 2 in the figure 2, and is used as a measuring port of voltage waveform between ports of the valve section.
In an embodiment, the controller may be specifically configured to:
controlling the disconnecting switch of the transformer to be disconnected and the load disconnecting switch to be closed;
controlling an external alternating current power supply to be boosted by a transformer, and outputting the boosted voltage to sub-module capacitors of a valve section to be tested, a valve tower or a bridge arm of a valve hall through a loop formed by a positive electrode or a negative electrode of the power supply, and diodes and capacitors of the bridge arm of the valve section to be tested, the valve tower or the bridge arm of the valve hall;
in the charging process, according to the detection voltage of an oscilloscope, when the difference value between the voltage of each submodule and the preset starting voltage is monitored to be smaller than a first preset voltage value, the energy-taking power supply starting voltage test of the submodules is completed according to the detected energy-taking power supply voltage, the communication state and the submodule capacitor voltage-sharing condition of each submodule;
and after the energy taking power supply voltage of each submodule is normal, the communication state is normal and the capacitor voltage sharing is normal, controlling the voltages at two ends of a bridge arm of the tested valve section, the valve tower or the valve hall to rise to a rated voltage, keeping a preset time length, and completing the voltage withstanding test of the submodule within the preset time length.
In specific implementation, a valve control monitoring module and a valve base control device for testing in a valve base monitoring system are started, after a test loop is checked to be correct, as shown in fig. 2, a transformer isolating switch K1 is controlled to be turned off, a load isolating switch K2 is turned on, a power frequency alternating current voltage source charges each submodule in a valve section, when the voltage of the submodule is about to reach a starting voltage required by an energy taking power supply, namely the difference value between the voltage of the submodule and a preset starting voltage is smaller than a first preset voltage value, the valve control monitoring system is observed, the energy taking power supply voltage, the communication state and the submodule capacitor voltage sharing condition of each submodule are checked and recorded, and the testing of the starting voltage of the energy taking power supply of the submodule is completed.
And then, if the submodule communication is normal, the voltage display is normal, the voltage sharing is good, the voltages at the two ends of the valve section are continuously boosted to the rated voltage, the preset time is kept for 10min, and the submodule withstand voltage test is carried out in the time period to complete the withstand voltage check (detection and test) of the submodule.
In an embodiment, the controller may be specifically configured to:
when the voltage resistance of the sub-module is monitored to be normal, the transformer isolating switch is controlled to be closed, the load isolating switch is controlled to be disconnected, and the electric quantity of the sub-module capacitor is discharged to the test load through the loop;
after the submodule naturally discharges to a second preset voltage value, controlling to issue an IGBT unlocking command, and completing the on-off test of the submodule IGBT according to the detection voltage of the oscilloscope;
and continuously keeping the IGBT turn-off state, reporting the energy-taking power supply fault until the sub-module is detected to be under-voltage according to the detection voltage of the oscilloscope, completing the sub-module bypass switch protection action function test according to the bypass switch action closing detection result, and completing the sub-module energy-taking power supply locking test according to the energy-taking power supply locking voltage detection result of each sub-module.
In specific implementation, if the converter valve has no abnormal voltage resistance, as shown in fig. 2, the transformer isolating switch K1 is controlled to be closed, the load isolating switch K2 is switched off, when the converter valve sub-modules naturally discharge to a certain voltage, the valve control system is controlled to issue an IGBT unlocking command, an IGBT on-off test is performed, the on-off trigger function of the IGBT is checked, a level step wave formed by the voltage between the valve ends and the capacitance voltage value of each sub-module are observed and recorded, and the IGBT on-off function check is completed.
And then, continuously keeping the turn-off state of the IGBT until the valve sub-modules are undervoltage, reporting an energy-taking power failure, checking whether the action of the bypass switch is closed, checking and recording the energy-taking power locking voltage of each sub-module, and completing the function verification of the protection action of the bypass switch and the locking test of the energy-taking power of the sub-modules.
In one embodiment, the test load may be a resistor. Of course the test load may be other devices.
In one embodiment, the transformer may be a single-phase power frequency transformer or a three-phase power frequency transformer.
In specific implementation, as shown in fig. 2, when the transformer is a single-phase power frequency transformer, the transformer is connected to the midpoint of the first phase unit of the tested valve segment through a first lead 1, connected to the midpoint of the second phase unit of the tested valve segment through a second lead 2, and connected to the second phase unit and the third phase unit through a third lead 3. As shown in fig. 4, when the transformer is a three-phase industrial frequency transformer, the first phase of the transformer is connected to the midpoint of the first phase unit of the tested valve segment through the fourth lead 4, the second phase of the transformer is connected to the midpoint of the second phase unit of the tested valve segment through the fifth lead 5, and the third phase of the transformer is connected to the midpoint of the third phase unit of the tested valve segment through the sixth lead 6. The wiring mode of the tested valve tower is detailed in the schematic diagrams of fig. 5 and 6, and the wiring mode of the bridge arm of the tested valve hall is detailed in the schematic diagram of fig. 7, please refer to the wiring mode of the valve section test, and the details are not repeated herein.
In one embodiment, the controller is a single chip controller.
When the practical application is carried out, the singlechip controller can complete the on-off control of the switch in the embodiment of the utility model and the judgment function compared with a threshold value, and the cost is low. Other types of controllers are of course possible.
Referring to fig. 2 to fig. 7, a detailed example of a scheme for detecting the internal electrical performance of the converter valve submodule in units of valve sections is described in detail as follows. The specific use method of the device for detecting the internal electrical performance of the converter valve submodule can comprise the following steps:
step 1): and preparing before testing, and confirming that a direct-current power supply with reliable wiring is available due to the fact that an isolation guardrail is arranged in a test field.
Step 2): the test wiring is carried out according to the attached figure 2, the test circuit mainly comprises a power frequency transformer T serving as a charging power supply, a transformer isolating switch K1, a test resistor R (test load), a resistor (load) isolating switch K2 and a tested valve section (comprising 6 submodules), wherein the test resistor is used as a load after the valve section is charged, a resistance-capacitance voltage divider is connected to two ends of the test resistor, namely the head end and the tail end of the tested valve section, the port is a measuring port of voltage waveform between ports of the valve section, and the monitoring function of the voltage waveform of the valve is realized by connecting the port with an oscilloscope.
And 3) adopting a bare conductor to short-circuit the bottom insulator of the valve tower and connecting the valve tower with the ground.
And 4) detecting and confirming that the bypass switch of the valve section submodule is disconnected through a multimeter.
And 5) reliably plugging the sub-modules and the communication optical fibers of the valve base controller for the test.
And 6) starting a valve control monitoring module and test valve base control equipment in the valve base monitoring system.
And 7) after the test loop is checked to be correct, disconnecting the transformer isolating switch K1, closing the resistor (load) isolating switch K2, and charging the sub-module capacitor of the valve section through the power frequency transformer T. Fig. 3 illustrates the charging principle briefly, and as shown by the dotted line in fig. 3, a loop is formed by the anode of the power supply, and the corresponding diode and capacitor of the sub-module of the bridge arm connected to the anode, and the path is the anode of the power supply-diode 31 (diode with the cathode connected to the capacitor) -capacitor C3-diode 41 (diode with the cathode connected to the capacitor) -capacitor C4-cathode of the power supply, so as to charge the capacitor of the sub-module on the right side to the peak voltage on the high-voltage side of the power frequency transformer; when the high-voltage alternating-current voltage is positive, negative and positive, as shown by a solid line in fig. 3, a loop is formed by a power supply anode (an original cathode), and a diode and a capacitor corresponding to the sub-module of the bridge arm connected with the power supply anode (an original cathode), a diode 11 (a diode with a cathode connected with the capacitor), a capacitor C1, a diode 21 (a diode with a cathode connected with the capacitor), a capacitor C2 and a power supply cathode, so that the capacitor of the left bridge arm is charged to the high-voltage side peak voltage of the power frequency transformer. Wherein, the valve section power of figure 2 is provided by single-phase power frequency transformer, and when the power supply becomes three-phase power frequency transformer, the experimental wiring of valve section just is figure 4. When the number of the submodules is used for carrying out a submodule performance test by taking a valve tower as a unit, a single-phase test wiring diagram refers to the attached figure 5, and a three-phase test wiring diagram refers to the attached figure 6; when the performance test of the submodules is carried out by taking the bridge arms as units, the three-phase test wiring diagram refers to the attached figure 7, and the charging steps are the same as those of the valve section test.
And 8) when the voltage of the sub-modules is about to reach the starting voltage range required by the energy taking power supply, observing the valve control monitoring system, checking and recording the energy taking power supply voltage, the communication state and the sub-module capacitor voltage sharing condition of each sub-module, and completing the energy taking power supply starting voltage test.
And 9) if the submodule communication is normal, the voltage display is normal, the voltage sharing is good, the voltages at the two ends of the valve section are continuously charged and boosted to the rated voltage, the voltage is kept for 10min, and the submodule withstand voltage test is carried out in the time period.
And step 10) if the voltage resistance of the converter valve is not abnormal in the charging step, disconnecting the resistance isolating switch K2, closing the transformer isolating switch K1, and carrying out the discharging process of the submodule capacitor to the resistor (load). When the converter valve sub-modules naturally discharge to a certain voltage (a second preset voltage value), the control monitoring system issues an IGBT unlocking command, the IGBT on-off test is carried out, the on-off trigger function of the IGBT is checked, the level step wave formed by the voltage between the valve ends and the capacitor voltage value of each sub-module are observed and recorded through oscilloscopes at the two ends of the resistor, and the on-off test of the IGBT is completed.
Step 11) keeping the IGBT turn-off state continuously until the valve sub-modules are under-voltage, reporting an energy-taking power failure, checking whether the action of the bypass switch is closed, checking and recording the energy-taking power locking voltage of each sub-module by means of an oscilloscope, and completing the function verification of the bypass switch protection action and the energy-taking power locking test of the sub-modules;
and step 12) after the test is finished, hanging the grounding rod after waiting for 15min, testing the voltage of the capacitor by using a universal meter and checking that the closed state of the bypass switch is correct, disassembling the sub-module communication optical fiber and disassembling the sub-module of the valve section.
And step 13) filling a valve section test list, and recording test results (detection results) of all items in the test process.
To sum up, the embodiment of the utility model provides a technical scheme provides the unified test method that is arranged in the many level voltage source type of examination modularization converter valve (MMC converter valve for short) part debugging valve section is experimental, valve tower is experimental and the bridge arm is experimental for compensate among the current test method to charge the realization submodule piece capability test's of converter valve submodule piece through rectifier module direct current source not enough, to scientific, judge clearly that the electric function and the parameter of the inside submodule piece of MMC converter valve provide reliable foundation, effectively guarantee the function normal of MMC converter valve submodule piece.
The utility model discloses the implementation provides technical scheme's beneficial technological effect does:
first, the utility model discloses the implementation provides a technical scheme utilizes MMC converter valve submodule piece self's diode to constitute the rectifier circuit, accomplishes the valve block step of charging with the help of the mode of low-voltage pressurization charging valve block submodule piece, once only accomplishes the submodule piece and gets can power supply start voltage test, submodule piece withstand voltage test, IGBT open turn-on turn-off test, bypass switch protection action test and get can power shutting voltage test, can fully examine submodule piece electrical property and parameter.
Secondly, the utility model discloses implement the technical scheme who provides and simplified the step that current valve section is experimental need provide the direct current power supply with the help of the rectifier bridge and charge to submodule piece electric capacity, avoided the contradiction that submodule piece high rated voltage and rectifier bridge module current performance are not enough, also simplified experimental wiring simultaneously, reduced the wrong risk of wiring because of the polarity problem brings.
Third, the utility model discloses implement the technical scheme easy operation that provides, require lowly to equipment performance, and application scope is wide, not only is applicable to valve section submodule piece capability test, can expand moreover to the submodule piece capability test who uses valve tower and bridge arm as the unit, and application scope is wide, and the commonality is strong.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that shown or described herein, or separately fabricated into individual integrated circuit modules, or multiple ones of them fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An apparatus for testing the internal electrical performance of a converter valve sub-module, comprising:
the first end of the transformer is connected with an external alternating current power supply and is used for boosting the external alternating current power supply;
the first end of the transformer isolating switch is connected with the second end of the transformer, and the second end of the transformer isolating switch is grounded;
the first end of the test load is connected with the first end of the transformer isolating switch, and the second end of the test load is connected with the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm; the test load is used for receiving the discharge electric quantity of the capacitor of the submodule of the converter valve to be tested;
the first end of the load isolating switch is connected with the first end of the test load; the second end of the load isolating switch is connected with the second end of the test load and the head end and the tail end of a tested valve section, a valve tower or a valve hall bridge arm;
the first end of the oscilloscope is connected with the first end of the test load and the first end of the load isolating switch, and the second end of the oscilloscope is connected with the second end of the test load, the second end of the load isolating switch and the head end and the tail end of a bridge arm of the tested valve section, the valve tower or the valve hall; the oscilloscope is used for detecting voltage in the test process;
the controller is used for controlling an external alternating-current power supply to be boosted by the transformer and then output to sub-module capacitors of the tested valve section, the valve tower or the valve hall bridge arm for charging through a loop formed by diodes and capacitors of the tested valve section, the valve tower or the valve hall bridge arm through a positive electrode or a negative electrode of the power supply when the isolation switch of the transformer is controlled to be switched off and the load isolation switch is controlled to be switched off; when the transformer isolating switch is controlled to be closed and the load isolating switch is controlled to be disconnected, the electric quantity of the sub-module capacitor is discharged to the test load through the loop, and in the discharging process, the sub-module IGBT turn-on and turn-off test, the sub-module bypass switch protection action function test and the sub-module energy-taking power supply locking test are sequentially completed according to the detection voltage of the oscilloscope; the diode is connected with the capacitor through a cathode.
2. The apparatus for testing electrical performance within a converter valve sub-module as recited in claim 1, wherein said controller is specifically configured to:
controlling the disconnecting switch of the transformer to be disconnected and the load disconnecting switch to be closed;
controlling an external alternating current power supply to be boosted by a transformer, and outputting the boosted voltage to sub-module capacitors of a valve section to be tested, a valve tower or a bridge arm of a valve hall through a loop formed by a positive electrode or a negative electrode of the power supply, and diodes and capacitors of the bridge arm of the valve section to be tested, the valve tower or the bridge arm of the valve hall;
in the charging process, according to the detection voltage of an oscilloscope, when the difference value between the voltage of each submodule and the preset starting voltage is monitored to be smaller than a first preset voltage value, the energy-taking power supply starting voltage test of the submodules is completed according to the detected energy-taking power supply voltage, the communication state and the submodule capacitor voltage-sharing condition of each submodule;
and after the energy taking power supply voltage of each submodule is normal, the communication state is normal and the capacitor voltage sharing is normal, controlling the voltages at two ends of a bridge arm of the tested valve section, the valve tower or the valve hall to rise to a rated voltage, keeping a preset time length, and completing the voltage withstanding test of the submodule within the preset time length.
3. The apparatus for testing electrical performance within a converter valve sub-module as recited in claim 1, wherein said controller is specifically configured to:
when the voltage resistance of the sub-module is monitored to be normal, the transformer isolating switch is controlled to be closed, the load isolating switch is controlled to be disconnected, and the electric quantity of the sub-module capacitor is discharged to the test load through the loop;
after the submodule naturally discharges to a second preset voltage value, controlling to issue an IGBT unlocking command, and completing the on-off test of the submodule IGBT according to the detection voltage of the oscilloscope;
and continuously keeping the IGBT turn-off state, reporting the energy-taking power supply fault until the sub-module is detected to be under-voltage according to the detection voltage of the oscilloscope, completing the sub-module bypass switch protection action function test according to the bypass switch action closing detection result, and completing the sub-module energy-taking power supply locking test according to the energy-taking power supply locking voltage detection result of each sub-module.
4. The apparatus for testing the internal electrical performance of a converter valve sub-module according to claim 1, wherein said test load is a resistor.
5. The apparatus for testing the internal electrical performance of a sub-module of a converter valve of claim 1, wherein said transformer is a single-phase line frequency transformer.
6. The apparatus for testing electrical performance inside a submodule of a converter valve as claimed in claim 5, wherein the single-phase power frequency transformer is connected to a midpoint of a first phase unit of the tested valve section through a first lead, the single-phase power frequency transformer is connected to a midpoint of a second phase unit of the tested valve section through a second lead, and the second phase unit and the third phase unit are connected through a third lead.
7. The apparatus for testing the internal electrical performance of a sub-module of a converter valve of claim 1, wherein said transformer is a three-phase line frequency transformer.
8. The apparatus for testing electrical performance inside a submodule of a converter valve as claimed in claim 7, wherein the first phase of the three-phase power frequency transformer is connected to the midpoint of the first phase unit of the tested valve section through a fourth lead wire, and the second phase of the three-phase power frequency transformer is connected to the midpoint of the second phase unit of the tested valve section through a fifth lead wire.
9. The apparatus for testing the internal electrical performance of a sub-module of a converter valve of claim 8, wherein the third phase of the three-phase line frequency transformer is connected to the midpoint of the third phase unit of the tested valve section through a sixth lead.
10. The apparatus for testing the internal electrical performance of a converter valve sub-module as recited in claim 1, wherein said controller is a single chip controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920442823.8U CN209911505U (en) | 2019-04-03 | 2019-04-03 | Device for detecting internal electrical performance of converter valve submodule |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920442823.8U CN209911505U (en) | 2019-04-03 | 2019-04-03 | Device for detecting internal electrical performance of converter valve submodule |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946600A (en) * | 2019-04-03 | 2019-06-28 | 国网冀北电力有限公司电力科学研究院 | Detect the device and control method of converter valve submodule internal electric performance |
| CN111551844A (en) * | 2020-05-06 | 2020-08-18 | 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 | Flexible direct current converter valve type test device and method |
| CN112039107A (en) * | 2020-08-28 | 2020-12-04 | 西安西电电力系统有限公司 | Flexible direct current transmission debugging system and flexible direct current transmission debugging live method |
-
2019
- 2019-04-03 CN CN201920442823.8U patent/CN209911505U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946600A (en) * | 2019-04-03 | 2019-06-28 | 国网冀北电力有限公司电力科学研究院 | Detect the device and control method of converter valve submodule internal electric performance |
| CN109946600B (en) * | 2019-04-03 | 2024-02-13 | 国网冀北电力有限公司电力科学研究院 | Device for detecting internal electrical performance of converter valve submodule and control method |
| CN111551844A (en) * | 2020-05-06 | 2020-08-18 | 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 | Flexible direct current converter valve type test device and method |
| CN111551844B (en) * | 2020-05-06 | 2021-04-06 | 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 | Flexible direct current converter valve type test device and method |
| CN112039107A (en) * | 2020-08-28 | 2020-12-04 | 西安西电电力系统有限公司 | Flexible direct current transmission debugging system and flexible direct current transmission debugging live method |
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