CN112994066B - Charging method and device for multi-soft direct current converter series connection converter station and electronic equipment - Google Patents
Charging method and device for multi-soft direct current converter series connection converter station and electronic equipment Download PDFInfo
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- CN112994066B CN112994066B CN202110146703.5A CN202110146703A CN112994066B CN 112994066 B CN112994066 B CN 112994066B CN 202110146703 A CN202110146703 A CN 202110146703A CN 112994066 B CN112994066 B CN 112994066B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a charging method, a charging device and electronic equipment for a multi-soft direct current converter tandem converter station, wherein the charging method, the charging device and the electronic equipment comprise the following steps: controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded; controlling all valve group units of the pole to be operated to be in a bypass state; a pole bus connected with a pole to be operated; sequentially controlling the valve group units to be put into operation to charge from the side close to the grounding point; and after all the valve group units to be put into charge are charged, controlling the electrodes to be operated to be connected in parallel to the direct current bus. The soft straight valve group unit that does not charge is in the bypass state before charging, does not have long-time series connection in the chargeable return circuit of direct current side, has eliminated the influence that full-bridge module electric capacity was precharged among the converter that does not charge, and half-bridge module electric capacity can be by normal charge, prevents simultaneously that soft straight converter submodule piece electric capacity voltage that does not charge from dispersing and overvoltage damage, has reduced economic loss, has ensured direct current system's safety and stability high efficiency operation.
Description
Technical Field
The invention relates to the field of direct current transmission, in particular to a charging method and device for a multi-flexible direct current converter series connection converter station and electronic equipment.
Background
In the current direct current transmission project, in consideration of economy and direct current fault ride-through capability, a full-bridge sub-module and a half-bridge sub-module are usually mixed and connected in series to form a single bridge arm of a current converter; in order to improve the DC voltage level, a single pole is formed by connecting two or more converters in series; a single converter station is configured with double poles, and a plurality of conventional direct current converter stations or flexible direct current converter stations are connected through direct current lines, so that high-voltage large-capacity direct current transmission is realized.
At present, a flexible direct current converter station formed by serially connecting bipolar multi-converters is usually a mode of firstly connecting all to-be-operated flexible direct current converters and then sequentially charging the flexible direct current converters at a polar bus from the flexible direct current converter close to a grounding point, for example, patent application with the application number of CN202010325051.7 discloses a charging control method, a device and a medium of a hybrid multi-terminal direct current transmission system, but the patent application does not consider that another operated or charged flexible direct current converter forms a loop through a long line to pre-charge a full bridge module in an uncharged converter, and the larger the voltage between terminals of the uncharged converter is, the higher the pre-charging voltage of a sub-module full bridge capacitor is. At this moment, the full-bridge submodule does not enter a voltage-sharing control state, the submodule capacitor voltage is easy to disperse, and the danger of overvoltage is possibly generated, so that the submodule is damaged, economic loss is caused, and the stable operation of a direct current system is influenced. The bipolar three-converter series connection soft-direct station as shown in fig. 4, the 1 st soft-direct converter and the 3 rd soft-direct converter of the pole 1 are to be put into operation, and the 2 nd soft-direct converter is to be withdrawn from operation. According to the technical solution of the patent application with the application number CN202010325051.7, in the preparation phase, the converter CVT is used as the converter1And an inverter CVT3Already connected in the DC-side loop, an inverter CVT1Charging first, the voltage presented at the DC side of the battery is passed through the CVT3And a direct current line grounding capacitor to form a loop for the converter CVT3Full bridge sub-module (FSM) capacitors in (e). Because the full-bridge sub-module has a certain voltage before AC charging, when AC charging, the half-bridge in the bridge armThe submodule is difficult to be charged to the lowest working voltage, energy can be slowly obtained only by means of loss difference between the submodules, and the submodule needs to wait for a long time and is not beneficial to starting of a direct current system. Therefore, a charging method suitable for series connection of multiple soft direct current converters needs to be researched, overvoltage damage caused by voltage divergence of a sub-module of an uncharged converter is prevented, and stable and efficient operation of a direct current system is guaranteed.
Disclosure of Invention
The present application provides a charging method, apparatus and electronic device for a multiple-soft-dc converter tandem converter station, which eliminates the loop formed by another operating pole or a charged soft-dc converter through a long line, and pre-charges the full bridge module in the uncharged converter, thereby preventing the sub-module voltage of the uncharged soft-dc converter from being dispersed and the half bridge module from being difficult to be charged.
In order to achieve the above purpose, the solution of the application is:
in one aspect, the present application provides a charging method for a multiple-soft dc converter tandem converter station, where the multiple-soft dc converter tandem converter station is formed by bipolar tandem connection, and a dc bus is connected in parallel through a line isolation switch; the midpoint of the dipole is grounded; each of the double poles is formed by sequentially connecting N valve group units in series, wherein N is more than or equal to 2; each valve group unit comprises a voltage source type current converter and a switch disconnecting link assembly, and a single bridge arm of the voltage source type current converter is formed by mixing and serially connecting a full-bridge module and a half-bridge module or is formed by serially connecting the full-bridge module. The charging method comprises the following steps: controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded; controlling all valve group units of the pole to be operated to be in a bypass state; a pole bus connected with the pole to be operated; sequentially controlling the valve group units to be put into operation to charge from the side close to the grounding point; and after all the valve group units to be put into charge are charged, controlling the electrodes to be operated to be connected in parallel to the direct current bus.
Further, the switch knife assembly comprises: the system comprises a bypass switch, a high-end disconnecting link, a low-end disconnecting link and a bypass disconnecting link; the voltage source type current converter is connected with the bypass switch in parallel, the high-voltage end of the unit connected in parallel is connected with one end of the high-end disconnecting link, and the low-voltage end of the unit connected in parallel is connected with one end of the low-end disconnecting link; the other end of the high-end disconnecting link and the other end of the low-end disconnecting link are respectively connected with two ends of the bypass disconnecting link.
Further, the controlling the grounding of the series converter station of the multiple flexible direct current converters comprises: and connecting the grounding electrode of the multi-flexible direct current converter serial converter station under the ground return wire, or connecting the station internal connection point of the multi-flexible direct current converter serial converter station under the metal return wire.
Further, the controlling all the valve block units of the pole to be operated to the bypass state includes: and controlling the valve group unit to be quitted to be operated to be in a first bypass state, and controlling the valve group unit to be put into operation to be in a second bypass state.
Further, the controlling the valve block unit to be exited to the first bypass state includes: disconnecting the bypass switch; disconnecting the high-end disconnecting link and the low-end disconnecting link; closing the bypass knife switch.
Further, the controlling the valve block unit to be put into operation to the second bypass state includes: closing a bypass switch; closing the high-end disconnecting link and the low-end disconnecting link; the bypass knife switch is disconnected.
Further, the controlling the charging of the valve block unit to be put into operation includes: carrying out short-circuit charging on a valve group unit to be put into operation; and after the voltage of the submodule is charged to the voltage rated value, the bypass switch is disconnected and the bypass switch is switched to the connection state.
Further, the controlling of the charging of the valve block unit to be put into operation includes: switching off a bypass switch of a valve group unit to be put into operation from a bypass state to a connection state; the valve block unit to be put into operation is immediately charged until the submodule voltage has reached the voltage setpoint value.
Further, the charging of the valve group units to be put into operation in sequence is specifically: when the charging of one valve bank unit to be put into operation is finished, the charging of the next valve bank unit to be put into operation is carried out; the charging completion flag is that all sub-module capacitor voltages in the valve block unit reach a voltage rating.
On the other hand, this application provides a many gentle dc-dc converter concatenates charging device of converter station, includes: the device comprises a grounding control module, a bypass control module, a pole bus connecting module, a charging control module and a direct current bus connecting module. The grounding control module is used for controlling the multiple flexible direct current converters to be connected with the converter station in series to be grounded; the bypass control module is used for controlling all the valve group units of the pole to be operated to be in a bypass state; the pole bus connecting module is used for controlling the pole to be operated to be connected with the pole bus; the charging control module is used for sequentially controlling the valve group units to be put into operation to be charged from the side close to the grounding point; and the direct current bus connecting module is used for controlling the electrodes to be operated to be connected in parallel to the direct current bus after all the valve group units to be put into charge are charged.
Further, the controlling all valve block units of the pole to be operated to the bypass state includes: and controlling the valve group unit to be quitted to be operated to be in a first bypass state, and controlling the valve group unit to be put into operation to be in a second bypass state.
Further, the controlling the valve block unit to be exited to the first bypass state includes: disconnecting the bypass switch; disconnecting the high-end disconnecting link and the low-end disconnecting link; closing the bypass knife switch; the controlling the valve block unit to be put into operation to the second bypass state includes: closing a bypass switch; closing the high-end disconnecting link and the low-end disconnecting link; the bypass knife switch is disconnected.
Further, the controlling of the charging of the valve block unit to be put into operation includes: carrying out short-circuit charging on the valve group unit to be put into operation; and after the voltage of the submodule is charged to the rated voltage value, disconnecting the bypass switch and converting the bypass switch from the bypass state to the connection state.
Further, the controlling of the charging of the valve block unit to be put into operation includes: a bypass switch for disconnecting the valve group unit to be put into operation is switched from a bypass state to a connection state; the valve block unit to be put into operation is immediately charged until the submodule voltage has reached the voltage setpoint value.
Further, the charging of the valve group units to be put into operation in sequence is specifically: when the charging of one valve bank unit to be put into operation is finished, the charging of the next valve bank unit to be put into operation is carried out; and the charging completion mark is that the capacitor voltage of all the sub-modules in the valve group unit reaches a voltage rated value.
In yet another aspect, the present application provides an electronic device, which includes a processor and a memory, where the memory stores a program, and the program can be loaded by the processor to execute the charging method of the tandem multi-flexible dc/dc converter station.
The beneficial effects of the invention are:
1. because the uncharged flexible direct-current valve group unit is in a bypass state before charging and is not connected in series in the rechargeable circuit at the direct-current side for a long time, the influence of precharging a full-bridge module capacitor in the uncharged converter is eliminated, a half-bridge module capacitor can be normally charged, and overvoltage damage caused by voltage divergence of the full-bridge sub-module capacitor in the uncharged flexible direct-current converter is prevented, so that economic loss is reduced, and safe and stable operation of a direct-current system is guaranteed;
2. only the charging sequence of the uncharged flexible-direct current converter is changed, a new hardware structure is not added, and the engineering site is more available;
3. the method is suitable for flexible direct current and mixed direct current engineering, is suitable for two-end and multi-end direct current engineering simultaneously, and has strong adaptability.
Drawings
Fig. 1 is a structural diagram of a tandem converter station with multiple flexible dc-dc converters according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a voltage source type converter topology structure in which a bridge arm is formed by mixing and connecting a full-bridge module and a half-bridge module in series.
Fig. 3 is a flowchart of a charging method for a series converter station with multiple flexible dc-dc converters according to an embodiment of the present application.
Figure 4 is a bipolar three inverter series flexspline embodiment.
Fig. 5 is a charging apparatus for a tandem converter station with multiple inverters according to an embodiment of the present disclosure.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
The method is suitable for conventional soft direct current engineering and hybrid direct current engineering comprising multiple soft direct current converters connected in series with a converter station. The serial conversion current of the multiple flexible direct current converters consists of bipolar serial connection, and is connected in parallel with a direct current bus through a line isolation switch knife switch; the midpoint of the dipole is grounded; each of the two poles is formed by sequentially connecting N valve group units in series, wherein N is more than or equal to 2; each valve group unit comprises a voltage source type converter and a switch knife-switch assembly. A single bridge arm of the voltage source converter may be formed by mixing and connecting a full bridge module and a half bridge module in series, as shown in fig. 2. The single bridge arm of the voltage source type current converter can also be formed by connecting the full-bridge modules in series. The switch knife switch subassembly includes: the system comprises a bypass switch, a high-end knife switch, a low-end knife switch and a bypass knife switch. The voltage source type current converter is connected with the bypass switch in parallel, the high-voltage end of the unit after parallel connection is connected with one end of the high-end disconnecting link, and the low-voltage end of the unit after parallel connection is connected with one end of the low-end disconnecting link; the other end of the high-end disconnecting link and the other end of the low-end disconnecting link are respectively connected with two ends of the bypass disconnecting link.
Fig. 1 is a structural diagram of a series converter station of multiple flexible dc-dc converters according to an embodiment of the present application. The serial conversion current of multiple soft DC converters consists of bipolar serial connection and is separated by a line through a disconnecting switch LS1And LS2Connecting the direct current buses in parallel; the bipolar midpoint is grounded through a grounding switch knife switch NS. Each monopole is formed by sequentially connecting N valve group units in series, wherein N is more than or equal to 2; the 1 st valve group unit is close to the local pole grounding point, and the Nth valve group unit is close to the pole bus. The nth valve group unit is composed of an inverter CVTnAnd a switch knife switch, N is more than or equal to 1 and less than or equal to N; converter CVTnAnd bypass switch BPSnParallel connection, the high-voltage end of the unit after parallel connection is connected with a high-end knife switch CInOne end of the low-voltage end of the switch is connected with a low-end knife switch AInOne end of (a); high-end knife switch CInAnother end and a low end disconnecting link AInThe other ends of the two are respectively connected with a bypass knife switch BPI2At both ends of the same. When N is not 1 or N, the bypass knife switch BPInTwo ends of the valve block are connected with two adjacent valve block units at the same time; when n is 1, the bypass knife switch BPInOne end of the valve group unit is connected with the adjacent valve group unit, and the other end of the valve group unit is connected with the grounding point; when N is N, the bypass knife switch BPInOne end of the valve group unit is connected with the adjacent valve group unit, and the other end of the valve group unit is connected with the pole bus.
Fig. 3 shows a charging method for a series converter station of multiple flexible dc-dc converters according to an embodiment of the present application, which includes the following steps:
s110: and controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded, and providing a zero-voltage clamp point for charging the valve group unit.
Under the ground loop, the control of the multiple flexible direct current converters to be connected with the converter station in series is that: and connecting the multiple flexible direct current converters to the grounding electrode of the converter station in series. Under the metal return wire, the control of the multiple flexible direct current converters to be connected with the converter station in series to be grounded refers to the following steps: and connecting the in-station grounding points of the multi-flexible direct current converter serial connection converter station.
S120: and controlling all valve group units of the pole to be operated to be in a bypass state.
Controlling all valve block units of the pole to be operated to the bypass state comprises: and controlling the valve group unit to be quitted to be operated to be in a first bypass state, and controlling the valve group unit to be put into operation to be in a second bypass state.
The method for controlling the valve group unit to be exited to the first bypass state comprises the following steps:
s121: disconnecting the bypass switch;
s122: disconnecting the high-end disconnecting link and the low-end disconnecting link;
s123: closing the bypass knife switch.
Wherein controlling the valve block unit to be put into operation to a second bypass state comprises:
s124: closing a bypass switch;
s125: closing the high-end disconnecting link and the low-end disconnecting link;
s126: the bypass knife switch is disconnected.
S130: and connecting the pole bus of the pole to be operated.
Specifically, a pole bus switch knife switch of a pole to be operated is closed.
S140: and sequentially controlling the valve unit to be put into operation to charge from the side close to the grounding point.
And sequentially controlling the valve group units to be put into operation to charge from the position close to the grounding point side to the polar bus. And when the charging of one valve bank unit to be put into operation is completed, the charging of the next valve bank unit to be put into operation is carried out. And judging that the charging is finished by the sign that the capacitor voltage of all the sub-modules in the valve group unit reaches a voltage rated value.
S150: and after all the valve group units to be put into charge are finished, controlling the electrodes to be operated to be connected in parallel to the direct current bus.
In a preferred embodiment, the valve block unit to be put into operation is controlled to be charged in the following way: firstly, naix carries out short-circuit charging on a valve group unit to be put into operation; and after the voltage of the sub-module is charged to the voltage rated value, the bypass switch is disconnected and the bypass switch is switched to the connection state from the bypass state.
In another preferred embodiment, the charging of the valve block unit to be put into operation may be controlled in the following manner: a bypass switch for disconnecting the valve group unit to be put into operation is switched from a bypass state to a connection state; the valve block unit to be put into operation is then immediately charged until the submodule voltage has reached the voltage setpoint value.
The following describes the method by taking a bipolar three-converter series flexible-straight station as an example with reference to fig. 4.
FIG. 4 shows a bipolar three-converter series flexible direct station, with a first line disconnector switch LS1And a second line disconnecting switch disconnecting link LS2And the direct current bus is connected in parallel. The converter station consists of a bipolar series connection, the bipolar midpoint being grounded through a grounding switch NS. Each monopole is formed by connecting 3 valve group units in series, the 1 st valve group unit is close to the grounding point of the local pole, and the 3 rd valve group unit is close to the pole bus.
Wherein, the 1 st valve group unit is composed of a voltage source type converter CVT1And a switch knife switch, a current converter CVT1And bypass switch BPS1Parallel connection, the high-voltage end of the unit after parallel connection is connected with a high-end knife switch CI1One end of the low-voltage end of the switch is connected with a low-end knife switch AI1One end of (a); high-end knife switch CI1Another end and a low end knife switch AI1The other ends of the two-way switch are respectively connected with a bypass knife switch BPI1At both ends of the same. Bypass knife switch BPI1One end is connected with the 2 nd valve group unit, and the other end is connected with a grounding point.
Wherein, the 2 nd valve groupCVT with unit composed of voltage source type converter2And a switch knife switch, a current converter CVT2And bypass switch BPS2Parallel connection, the high-voltage end of the unit after parallel connection is connected with a high-end knife switch CI2One end and the low-voltage end of the switch are connected with a low-end switch AI2One end of (a); high-end knife switch CI2Another end and a low end disconnecting link AI2The other ends of the two-way switch are respectively connected with a bypass knife switch BPI2At both ends of the same. BPI bypass knife switch2One end is connected with the 3 rd valve group unit, and the other end is connected with the 1 st valve group unit.
Wherein, the 3 rd valve group unit is composed of a voltage source type converter CVT3And a switch knife switch, the current converter CVT3And bypass switch BPS3Parallel connection, the high-voltage end of the unit after parallel connection is connected with a high-end knife switch CI3One end of the low-voltage end of the switch is connected with a low-end knife switch AI3One end of (a); high-end knife switch CI3Another end and a low end disconnecting link AI3The other ends of the two are respectively connected with a bypass knife switch BPI3At both ends of the tube. BPI bypass knife switch3One end is connected with the pole bus, and the other end is connected with the 2 nd valve group unit. In the embodiment, a single bridge arm of the voltage source type current converter is formed by mixing and serially connecting a full-bridge module and a half-bridge module. In this embodiment, the 1 st and 3 rd vdc converters of pole 1 are to be put into operation, the 2 nd vdc converter is to be taken out of operation, and the charging method includes the following steps:
s210: and controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded. At the moment, the grounding pole is connected under the ground return wire, and the grounding switch knife switch NS is switched on to provide a zero voltage clamp point for charging the valve group unit.
S220: and controlling all valve group units of the pole to be operated to be in a bypass state. For the pole 1 to be operated, the 2 nd valve group unit to be out of operation is operated to the first bypass state, namely: BPS for disconnecting bypass switch2And disconnecting the high-end knife switch CI2And a low-end disconnecting link AI2BPI for closing bypass knife switch2(ii) a Operating the valve block unit to be put into operation 1 to the second bypass state, that is: BPS (brake pressure switch) of on bypass switch1Closing high-end knife switch CI1And a low-end disconnecting link AI1BPI for disconnecting bypass switch1(ii) a Operating the valve group unit 3 to be put into operation to a second bypass state, and closing a bypass switch BPS3Closing high-end knife switch CI3And a low-end disconnecting link AI3BPI for disconnecting bypass switch3。
S230: closing pole bus switch knife switch BS of pole 1 to be operated1Completing the connection between the electrode to be operated and the electrode bus; s240: sequentially charging the valve group unit 1 and the valve group unit 3 to be put into operation from the beginning of approaching the grounding point to the end of the polar bus;
firstly, charging the valve group unit 1 to be put into operation in a first or second mode, wherein the first mode is that the valve group unit 1 to be put into operation is short-circuited and charged, and after the voltage of the submodule is charged to the voltage rated value of the submodule, a bypass switch BPS is switched off1Switching from the bypass state to the connection state; the second mode is to disconnect the bypass switch BPS of the valve group unit to be put into operation firstly1After the bypass state is converted into the connection state, immediately charging until the voltage of the submodule is charged to the rated value; the valve block unit 1 is charged completely.
After the valve group unit 1 is charged, the valve group unit 3 to be put into operation is charged in a first mode or a second mode, wherein the first mode is that the valve group unit 3 to be put into operation is short-circuit charged firstly, and after the submodule voltage is charged to the submodule voltage rated value, the bypass switch BPS is switched off3Switching from the bypass state to the connected state; the second mode is to disconnect the bypass switch BPS of the valve group unit 3 to be put into operation firstly3After the bypass state is converted into the connection state, immediately charging until the voltage of the submodule is charged to a rated value; the valve block unit 3 is charged.
S250: after all the valve unit 1 and the valve unit 3 to be put into the valve are charged, the switch LS is switched on for the operation electrode 11And the direct current bus is connected in parallel, and charging is completed.
As shown in fig. 5, the present embodiment provides a charging apparatus 100 for a serial converter station with multiple flexible dc converters, which includes a ground control module 10, a bypass control module 20, a pole bus connection module 30, a charging control module 40, and a dc bus connection module 50, which are connected in sequence.
And the grounding control module is used for controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded.
And the bypass control module is used for controlling all the valve group units of the pole to be operated to be in a bypass state.
And the pole bus connecting module is used for controlling the pole to be operated to be connected with the pole bus.
And the charging control module is used for sequentially controlling the valve group units to be put into operation to be charged from the side close to the grounding point.
And the direct current bus connecting module is used for controlling the electrodes to be operated to be connected in parallel to the direct current bus after all the valve group units to be put into charge are charged.
In a preferred embodiment, controlling all valve pack units of the pole to be operated to the bypass state comprises: and controlling the valve group unit to be quitted to be operated to a first bypass state, and controlling the valve group unit to be put into operation to a second bypass state.
In a preferred embodiment, controlling the valve block unit to be exited to the first bypass state includes: disconnecting the bypass switch; disconnecting the high-end disconnecting link and the low-end disconnecting link; closing the bypass knife switch; the controlling the valve block unit to be put into operation to the second bypass state comprises: closing a bypass switch; closing the high-end disconnecting link and the low-end disconnecting link; the bypass knife switch is disconnected.
In a preferred embodiment, controlling the charging of the valve block unit to be put into operation includes: carrying out short-circuit charging on the valve group unit to be put into operation; and after the voltage of the submodule is charged to the rated voltage value, disconnecting the bypass switch and converting the bypass switch from the bypass state to the connection state.
In a preferred embodiment, controlling the charging of the valve block unit to be put into operation includes: switching off a bypass switch of a valve group unit to be put into operation from a bypass state to a connection state; the valve block unit to be put into operation is immediately charged until the submodule voltage has reached the voltage setpoint value.
In a preferred embodiment, sequentially controlling the charging of the valve group units to be put into operation specifically includes: when the charging of one valve bank unit to be put into operation is finished, the charging of the next valve bank unit to be put into operation is carried out; the charging completion flag is that all sub-module capacitor voltages in the valve block unit reach a voltage rating.
The embodiment of the application also provides electronic equipment, which comprises a processor and a memory, wherein the memory is stored with a program, and the program can be loaded by the processor to execute the charging method of the multi-soft dc converter series converter station.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above detailed description is directed to a specific example of a possible embodiment of the present invention, which is not intended to limit the scope of the invention, but rather the scope of the invention is intended to include all equivalent implementations or modifications without departing from the scope of the invention.
Claims (11)
1. A charging method for a multi-flexible DC converter series connection converter station is characterized in that the multi-flexible DC converter series connection converter station is formed by bipolar series connection, and a DC bus is connected in parallel through a line disconnecting switch; the midpoint of the dipole is grounded; each of the double poles is formed by sequentially connecting N valve group units in series, wherein N is more than or equal to 2; each valve group unit comprises a voltage source type current converter and a switch disconnecting link assembly, wherein a single bridge arm of the voltage source type current converter is formed by mixing and connecting a full-bridge module and a half-bridge module in series or is formed by connecting the full-bridge module in series; the charging method is characterized by comprising the following steps:
controlling the multiple flexible direct current converters to be connected in series with the converter station to be grounded;
controlling all valve group units of the pole to be operated to be in a bypass state; the method specifically comprises the following steps: controlling the valve bank unit to be quitted to a first bypass state, and controlling the valve bank unit to be put into operation to a second bypass state; the controlling the valve block unit to be exited to the first bypass state comprises: disconnecting the bypass switch, disconnecting the high-end disconnecting link and the low-end disconnecting link, and switching on the bypass disconnecting link; the controlling the valve block unit to be put into operation to the second bypass state includes: switching on a bypass switch, switching on a high-end disconnecting link and a low-end disconnecting link, and disconnecting the bypass disconnecting link;
a pole bus connected with a pole to be operated;
sequentially controlling the valve group units to be put into operation to charge from the side close to the grounding point;
and after all the valve group units to be put into charge are finished, controlling the electrodes to be operated to be connected in parallel to the direct current bus.
2. A method of charging a multiple-flexible dc converter tandem converter station according to claim 1, characterized by: the switch knife switch assembly comprises: the system comprises a bypass switch, a high-end disconnecting link, a low-end disconnecting link and a bypass disconnecting link;
the voltage source type current converter is connected with the bypass switch in parallel, the high-voltage end of the unit after parallel connection is connected with one end of the high-end disconnecting link, and the low-voltage end of the unit after parallel connection is connected with one end of the low-end disconnecting link; the other end of the high-end disconnecting link and the other end of the low-end disconnecting link are respectively connected with two ends of the bypass disconnecting link.
3. A method of charging a multiple-vdc tandem converter station according to claim 1, wherein: the controlling the grounding of the multi-flexible direct current converter series connection converter station comprises the following steps: and connecting the grounding electrode of the multi-flexible direct current converter serial converter station under the ground return wire, or connecting the station internal connection point of the multi-flexible direct current converter serial converter station under the metal return wire.
4. A method of charging a multiple-vdc tandem converter station according to claim 1, wherein:
the controlling of the charging of the valve block unit to be put into operation includes:
carrying out short-circuit charging on a valve group unit to be put into operation;
and after the voltage of the submodule is charged to the voltage rated value, the bypass switch is disconnected and the bypass switch is switched to the connection state.
5. A method of charging a multiple-flexible dc converter tandem converter station according to claim 1, characterized by:
the controlling of the charging of the valve block unit to be put into operation includes:
a bypass switch for disconnecting the valve group unit to be put into operation is switched from a bypass state to a connection state;
and immediately charging the valve group unit to be put into operation until the voltage of the submodule is charged to the rated voltage value.
6. A method of charging a multiple-vdc tandem converter station according to claim 1, wherein: the charging of the valve group unit to be put into operation is controlled in sequence as follows: when the charging of one valve bank unit to be put into operation is finished, the charging of the next valve bank unit to be put into operation is carried out; the charging completion flag is that all sub-module capacitor voltages in the valve block unit reach a voltage rating.
7. A charging device for a multi-soft DC converter series converter station is characterized by comprising:
the grounding control module is used for controlling the multiple flexible direct current converters to be connected with the converter station in series to be grounded;
the bypass control module is used for controlling all the valve group units of the pole to be operated to be in a bypass state; the controlling all the valve group units of the pole to be operated to the bypass state comprises the following steps: controlling the valve group unit to be quitted to be in a first bypass state, and controlling the valve group unit to be put into operation to be in a second bypass state; the controlling the valve block unit to be exited to the first bypass state comprises: disconnecting the bypass switch, disconnecting the high-end disconnecting link and the low-end disconnecting link, and switching on the bypass disconnecting link; the controlling the valve block unit to be put into operation to the second bypass state includes: switching on a bypass switch, switching on a high-end disconnecting link and a low-end disconnecting link, and disconnecting the bypass disconnecting link;
the pole bus connecting module is used for controlling the pole to be operated to be connected with the pole bus;
the charging control module is used for sequentially controlling the valve group units to be put into operation to be charged from the side close to the grounding point; and the direct current bus connecting module is used for controlling the electrodes to be operated to be connected in parallel to the direct current bus after all the valve group units to be put into charge are finished.
8. A charging arrangement for a multiple-vdc tandem converter station according to claim 7, wherein:
the controlling of the charging of the valve block unit to be put into operation includes:
carrying out short-circuit charging on the valve group unit to be put into operation;
and after the voltage of the submodule is charged to the rated voltage value, disconnecting the bypass switch and converting the bypass switch from the bypass state to the connection state.
9. A charging arrangement for a multiple-vdc tandem converter station according to claim 7, wherein: the controlling of the charging of the valve block unit to be put into operation includes:
switching off a bypass switch of a valve group unit to be put into operation from a bypass state to a connection state;
and immediately charging the valve group unit to be put into operation until the voltage of the submodule is charged to the rated voltage value.
10. A charging arrangement for a multiple-vdc tandem converter station according to claim 7, wherein: the charging of the valve group units to be put into operation is controlled in sequence as follows: when the charging of one valve bank unit to be put into operation is finished, the charging of the next valve bank unit to be put into operation is carried out; and the charging completion mark is that the capacitor voltage of all the sub-modules in the valve group unit reaches a voltage rated value.
11. An electronic device, characterized in that: comprising a processor and a memory, said memory having a program stored thereon, said program being loadable by said processor to perform the method of charging a multiple-flexible direct current converter series converter station according to any of the claims 1 to 6.
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| CN202110146703.5A CN112994066B (en) | 2021-02-03 | 2021-02-03 | Charging method and device for multi-soft direct current converter series connection converter station and electronic equipment |
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| CN202110146703.5A CN112994066B (en) | 2021-02-03 | 2021-02-03 | Charging method and device for multi-soft direct current converter series connection converter station and electronic equipment |
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| CN107732954A (en) * | 2017-11-22 | 2018-02-23 | 南京南瑞继保电气有限公司 | A kind of online input control method and device of voltage source converter unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107732954A (en) * | 2017-11-22 | 2018-02-23 | 南京南瑞继保电气有限公司 | A kind of online input control method and device of voltage source converter unit |
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