CN113839548B - Method and controller for controlling start-up and shutdown of converter valve group - Google Patents
Method and controller for controlling start-up and shutdown of converter valve group Download PDFInfo
- Publication number
- CN113839548B CN113839548B CN202111047007.5A CN202111047007A CN113839548B CN 113839548 B CN113839548 B CN 113839548B CN 202111047007 A CN202111047007 A CN 202111047007A CN 113839548 B CN113839548 B CN 113839548B
- Authority
- CN
- China
- Prior art keywords
- converter
- valve
- converter valve
- transformer
- standby state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5375—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with special starting equipment
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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]
Abstract
The utility model provides a start-up, outage control method and controller of converter valve group, in the in-process of converter valve group from the hot standby state of exchange side to the hot standby state of converter valve group, close net side switch earlier and carry out the converter transformer and charge, the operation of charging of converter valve is carried out to the switching valve side switch again, and in the in-process of the hot standby state of converter valve group to the alternating side of converter transformer, carry out the outage of converter valve through dividing valve side switch earlier, the outage of converter transformer is carried out to the switching net side switch again, thereby the charging (outage) of converter transformer and the charging (outage) of converter valve decoupling, make the operation of alternating current station no longer couple in the charging (outage) of converter station, the charging (outage) of converter valve is independently controllable by the converter station personnel, the operation sequence in the whole valves start-up and outage in-process has been optimized, the efficiency of operating personnel operation has been improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a method for controlling start-up and shutdown of a converter valve group and a controller.
Background
With the development of the power grid, the short-circuit current of the large power grid in the core load area is close to the breaking capacity of the alternating current breaker, and the problem of exceeding the standard of the short-circuit current becomes an important factor for influencing the safety and stability of the power grid. One possible idea is to construct a flexible direct current back-to-back project in the core area of the power grid, divide a large power grid into two small power grids, and interconnect the two small power grids through the flexible direct current project, so that the short-circuit current of the power grid is reduced.
Because of the load core area, the engineering construction land resources are tense, an alternating current station which is not specially constructed for a valve bank (comprising a converter transformer and a converter valve) in the flexible direct current back-to-back engineering exists, and under the condition, the converter transformer incoming line of the valve bank is connected to an alternating current transformer station of a converter station accessory where the valve bank is located through a GIS bus, so that the land and the cost of the converter station in the flexible direct current engineering can be saved.
However, for a converter station without a self-built ac station, the converter station equipment and the ac station equipment belong to two operation and maintenance units, and the control systems of the two stations cannot communicate due to different manufacturers and construction ages. Therefore, in the starting process of the valve group of the converter station without the self-built alternating-current power station, when the operator of the converter station operates to a ready state, the operator of the alternating-current station needs to wait for the switching-on operation of the network-side alternating-current switch to be manually carried out, and then the next operation can be carried out; in the valve group shutdown process, the next operation can be performed only by waiting for the switching-off operation of the network side alternating current switch by the alternating current station operator. Obviously, the operation of such an ac-station is coupled to the start-stop-sequence control operation of the converter station, which is quite complex.
Disclosure of Invention
Based on the above, the application provides a method for controlling the start-up and stop-down of a converter valve group and a controller, so as to solve the problem of complex start-stop-down control in back-to-back direct current engineering without a self-built alternating current station.
In one aspect, the invention provides a method for controlling the start of a converter valve group, wherein the converter valve group comprises a converter transformer and a converter valve, and the method for controlling the start comprises the following steps:
controlling the converter valve group to enter a hot standby state;
closing a network side switch on the network side to charge the converter transformer;
after the converter transformer is charged, and the direct current output end of the converter valve is connected with the HVDC, closing a valve side switch at the valve side, and charging the converter valve;
and after the converter valve is charged, the converter valve group enters a hot standby state.
In some embodiments, the valve block is a flexible dc valve block,
the network side switch is a network side alternating current inlet switch in an alternating current station connected with the converter transformer.
In some embodiments, after the converter valve is charged, a starting resistor bypass breaker between the converter transformer and the converter valve is controlled to be switched on, and the converter valve group enters a hot standby state.
In some embodiments, the start control method further includes:
and operating the converter valve group to an operating state according to an unlocking command during the period that the converter valve group enters the hot standby state.
On the other hand, the application also provides a starting controller of the converter valve group, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that the step of any starting control method is realized when the processor executes the program.
In addition, the application also provides an outage control method of the converter valve group, wherein the converter valve group comprises a converter transformer and a converter valve, and the outage control method comprises the following steps:
after the converter valve group enters a hot standby state, a valve side switch at a valve side is disconnected to perform power-off operation on the converter valve;
after the converter valve is powered off, a network side switch on the network side is disconnected to perform power-off operation on the converter transformer;
disconnecting the HVDC connection of the direct current output end of the converter valve;
and the converter valve group enters a hot standby state of an alternating current side after the converter transformer is powered off and the HVDC connection is disconnected.
In some embodiments, the valve block is a flexible dc valve block,
the network side switch is a line-in switch in an alternating current station connected with the converter transformer.
In some embodiments, a start-up resistor bypass knife separation between the converter transformer and the converter valve is controlled after the converter valve de-energized is completed.
In some embodiments, the outage control method further comprises:
and operating the converter valve group from the running state to the standby state according to a locking command.
Finally, the present application also provides an outage controller for a converter valve set, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the outage control methods when executing the program.
In the method and the controller for controlling the starting and stopping of the converter valve bank, in the process of the converter valve bank from the hot standby state of the alternating current side to the hot standby state of the converter valve bank, the network-side switch is combined firstly to charge the converter transformer, then the valve-side switch is combined to charge the converter valve, in the process of the hot standby state of the converter valve bank to the hot standby state of the alternating current side of the converter transformer, the valve-side switch is separated firstly to power off the converter valve, the network-side switch is separated to power off the converter transformer, so that the charging (breaking) of the converter transformer is electrically decoupled from the charging (breaking) of the converter valve, the operation of the alternating current station is not coupled in the charging (breaking) of the converter station any more, the charging (breaking) of the converter valve is independently controllable by a converter station person, the operation sequence of the whole valve bank in the starting and stopping process is optimized, and the operation efficiency of an operator is improved.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a topology of a converter valve block in a cold standby state;
FIG. 2 is a schematic diagram of a start-up and shut-down flow of a converter valve assembly according to an embodiment of the present application;
fig. 3 is a schematic diagram of a topology of the converter valve set in a standby state on the ac side;
FIG. 4 is a schematic diagram of a topology of a converter valve stack in a hot standby state;
fig. 5 is a schematic flow chart of a method for controlling start-up of a converter valve set according to an embodiment of the present application;
fig. 6 is a schematic flow chart of a shutdown control method of a converter valve set according to an embodiment of the present application.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
Fig. 1 is a schematic diagram of a topological structure of a converter valve bank in a direct current transmission system, and as shown in fig. 1, the converter valve bank in a converter station mainly comprises a converter transformer and a converter valve, wherein an alternating current inlet wire of the converter transformer is connected with the alternating current station through a GIS tubular bus. The alternating current station comprises a switch and an isolation switch which are connected in series with the GIS tubular bus, such as a switch W91 and isolation switches Q11 and Q12. The grid side of the converter transformer is provided with an isolation disconnecting link Q1, the valve side is provided with a valve side switch Q90 and isolation disconnecting links Q2 and Q3, the input end of the converter valve is also provided with a starting resistor and a bypass isolation disconnecting link Q4 which is parallel to the starting resistor, the positive output end and the negative output end of the direct current side are also respectively provided with isolation disconnecting links Q5 and Q6, and when the switch states of the isolation disconnecting links Q5 and Q6 are controlled, the converter valve group and the direct current input end of the opposite side converter station of the converter valve group can be connected or disconnected.
It should be noted that, in the present application, the dc power transmission system is a back-to-back flexible dc power transmission system, and the converter valve group is a flexible dc converter valve group. In the flexible dc power transmission system of the present application, the above-mentioned switches and isolation switches (such as switches W91 and Q90 and isolation switches Q1, Q2, Q3, Q4, Q5, Q6, Q11 and Q12) are switching devices that can be switched on and off. The switches are used for controlling the charge and discharge of the converter valve block, and the isolation switches are used for controlling the states of the converter valve block, such as the hot standby state, the hot standby state and the cold standby state of the alternating current side, and the functions of the isolation switches will be further described with reference to the accompanying drawings.
The hot standby state refers to a state in which the device has operating conditions and can be switched to an operating state through a closing operation. And the cold standby state refers to a state that all switches and isolating knife switches of the equipment are in an off position and wait for being closed.
In the present application, the primary side of the converter transformer, i.e. the side closer to the ac station, is referred to as the net side, the switch located on the net side of the converter transformer is referred to as the net side switch, the side of the converter transformer closer to the converter valve is referred to as the valve side, the switch located on the valve side is referred to as the valve side, and the output side of the converter valve is referred to as the dc side. . The converter valve group provided by the application is a converter valve group of a converter station in a flexible direct current back-to-back direct current transmission system, namely the flexible direct current converter valve group, and in order to save the land used in a load center, the converter station has no self-built alternating current station, so that the alternating current station in fig. 1 is an alternating current station of other power grids nearby the converter station. In this case, if the charging and discharging of the converter transformer and the converter valve are performed simultaneously according to the existing control method for starting and stopping the converter valve, the starting and stopping of the valve set need to wait for the related operation of personnel in the ac station. For this purpose, the present application provides a start-up control method and a shutdown control method for the converter valve set shown in fig. 1.
Fig. 2 is a schematic diagram of a specific embodiment of a start-up control procedure and a shutdown control procedure of a converter valve set according to the present application. The actuation of the valve block is typically an action that needs to be performed after a long-term shutdown or service. In this embodiment, taking an example that the valve needs to be started after maintenance as an example, the start-up and shutdown control process of the converter valve set provided in the present application is described.
When the converter valve group needs to be started after the equipment maintenance is completed, the converter valve group needs to be operated to a cold standby state, as shown in fig. 1, the cold standby state of the converter valve group refers to that the related charge and discharge control switches W91 and Q90 of the converter valve group are in a brake separating state with the isolation brakes Q1, Q2, Q3, Q4, Q5, Q6, Q11 and Q12 related to the standby state. In fig. 1, 3 and 4, white filling is used to indicate that the switch or the isolation switch is in the open state, and black filling is used to indicate that the switch or the isolation switch is in the closed position, so as to facilitate the indication of the closed and open states of the switch or the isolation switch. The state of the individual switches and isolation knife switches is shown in fig. 1 in the cold standby state of the converter valve block.
Then, the converter valve bank is operated to an alternating-current side hot standby state, the alternating-current side hot standby state of the converter valve bank means that the alternating-current side of the converter valve bank has running conditions, an alternating-current power supply of the alternating-current side can charge the converter valve bank as long as one switching-on operation is performed, in the method, the alternating-current side of the converter valve bank is also called a network side, a switch W91 in an alternating-current station is used as a network side switch, and after the converter valve bank enters the alternating-current side hot standby state, the power supply of the alternating-current station can charge a converter transformer as long as the network side switch W91 is subjected to switching-on operation. Therefore, in the present application, as shown in fig. 3, which is a diagram of the on/off states of the switches and the isolation knife switches of the converter valve set in the ac side hot standby state, the steps of operating the converter valve set to the ac side hot standby state are as follows: when the isolation disconnecting links Q11 and Q12 in the ac station, the isolation disconnecting link Q1 on the grid side of the converter transformer, and the isolation disconnecting links Q2 and Q3 on the valve side are all in the closed state, the ac power supply of the ac station can charge the converter transformer only by performing the closing operation on the grid side switch W91.
After the converter valve group is operated to the alternating-current side hot standby state, the network side switch can be closed firstly so that the power supply of the alternating-current station charges the converter transformer, or the isolation knife switches Q5 and Q6 on the direct-current side can be closed before the network side switch W91 is closed so as to prepare for the subsequent charging of the converter valve in advance. Of course, the steps of charging the converter transformer and closing the isolation switches Q5, Q6 on the dc side may also be performed simultaneously.
In this embodiment, after the converter valve group enters the hot standby state of the ac side, the cutters Q5 and Q6 of the dc side are first closed to perform HVDC (high voltage direct current) connection at the output end of the converter valve, so that the direct current transmission line connected to the dc output end of the converter valve is in a conductive state. And then charging the converter transformer and charging the converter valve in sequence, after the converter valve is charged, the converter valve group enters a hot standby state, and then the converter valve group can be controlled to enter an operating state according to an unlocking command of the converter valve group. As shown in fig. 4, during the hot standby state of the converter valve block, each switch and isolation knife switch are in a closed position, which is the exact opposite of the cold standby state shown in fig. 1. The hot standby state of the converter valve bank means that all corresponding switches and isolation disconnecting links of the converter valve bank are in closing positions, namely, the alternating current station and the converter valve are in an electric connection passage state, and the converter valve bank is charged, so that the converter valve bank can perform converter work at any time according to an unlocking instruction, namely, the converter valve bank enters an operating state.
Conversely, when the converter valve bank is to be shut down because of maintenance, the shutdown control process is the reverse process of the starting control process, namely, the converter valve bank is firstly operated from an operation state to a hot standby state of the converter valve bank, then the converter valve and the converter transformer are sequentially powered off, and after the converter transformer is powered off, the HVDC connection is disconnected, so that the converter valve bank is in an alternating-current side hot standby state. After that, the converter valve group needs to be further controlled to enter a cold standby state and finally enter an overhaul state.
In this embodiment, the HVDC connection is performed before the charging of the converter transformer, which ensures that after the converter transformer is charged, the two side risers of the converter valve have charging conditions for the converter valve to charge the converter valve immediately. Also in this embodiment, the disconnection of the HVDC is after the de-energizing of the converter transformer, which ensures that the valve block can be immediately brought into a valve side ac hot standby state of the converter transformer after the de-energizing of the converter transformer, whereas in other embodiments the de-energizing of the converter transformer can be performed simultaneously with the two steps of HVDC connection, by which parallel operation the time of the de-energizing of the valve block is advantageously reduced.
For further clarity of description of the present application, the start-up control process and the shut-down control process of the valve block according to the present application will be described below, respectively.
Fig. 5 is a flowchart of a method for controlling the start of a converter valve set according to the present application.
In the present embodiment, the start control method includes S11 to S15, which are specifically described as follows:
s11, controlling the converter valve group to enter an alternating-current side hot standby state.
In the starting process of the converter valve group, after the converter valve group enters a cold standby state, firstly, the alternating current side of the converter transformer needs to be operated to a hot standby state, so that the alternating current side of the converter transformer has the condition of charging the converter transformer. Therefore, when the hot standby state of the ac side needs to be entered in the converter valve group, it is necessary to control whether the isolation knife switches Q11, Q12 in the ac side are in a closed state, if not, it is necessary to perform the closing control, and if not, it is necessary to ensure whether the isolation knife switches Q2, Q3 on the valve side are in the open position, and if not, it is necessary to perform the opening control first, so as to ensure that the electrical connection between the converter transformer and the converter valve is broken during the charging of the converter transformer. The closing and opening of each gate can be realized through a control program in a computer according to corresponding execution commands, for example, each switch and gate in the converter station are controlled by a corresponding computer in a control system of the converter station; each switch and gate can also be realized through manual operation of operators of each station, for example, each switch in the converter station is operated by the operators in the converter station to switch on and off, and the switch in the alternating current station is operated by the operators in the alternating current station to switch on and off; in addition, each switch and gate can also adopt the singlechip to control the switching on and off, for example, the switch in the converter station is switched on and off by the singlechip in the control system that corresponds to the converter station, and the switch in the alternating current station is switched on and off by the control system in the alternating current station.
And S12, connecting the direct current output end of the converter valve with the HVDC.
The controller of the converter valve bank is usually provided with an HVDC connection button, and after S11 is completed, only the operator of the converter station needs to click the HVDC connection button to execute the HVDC connection operation, so that the dc side isolation knife gates Q5 and Q6 on both sides (positive pressure side and negative pressure side) of the dc output end of the converter valve can be automatically combined to realize HVDC connection. In this embodiment, the HVDC connection of the dc output of the converter valve is performed by manual operation of a converter station operator, and in other embodiments, the HVDC connection of the dc output of the converter valve may be performed automatically by the control system of the converter station after receiving an instruction for the ac side of the converter transformer to enter the hot standby state.
And S13, closing a network side switch and charging the converter transformer.
After both sides of the converter transformer meet the charging condition, i.e. the network side of the converter transformer has already entered the hot standby state of the ac side, and the electrical connection between the valve side and the converter valve is also ensured to be in the disconnected state, the converter transformer can be charged by using the ac power of the network side by controlling the on-network side switch (W91). In this embodiment, the network side switch W91 is a line incoming switch in the ac station, and the operator of the ac station can manually close the network side switch, and in other embodiments, after receiving a command of closing the network side switch sent by the control system in the ac station, the control system of the ac station may automatically control the network side switch to close.
And S14, closing a valve side switch and charging the converter valve.
In this embodiment, the HVDC connection step precedes the charging step of the converter transformer, and in other embodiments both may be performed simultaneously. After both sides of the converter valve meet the charging condition, namely the converter transformer at the valve side is fully charged, and the isolation disconnecting links Q5 and Q6 at the direct current side are in a closing state, the valve side switch Q90 can be closed, so that the converter transformer charges the converter valve. Obviously, in the present application, the charging of the converter transformer and the charging of the converter valve are performed in different time phases, and the charging of the converter transformer is performed first and then the charging of the converter valve is performed, that is, the charging control of the converter transformer and the charging control of the converter valve are decoupled. In addition, in this embodiment, the valve side switch is manually closed by an operator of the converter station, and in other embodiments, the control system of the converter station may also automatically control the valve side switch to be closed when receiving an instruction for closing the valve side switch after the converter transformer is charged.
And S15, after the converter valve is charged, enabling the converter valve group to enter a hot standby state.
After the charging of the converter valve is completed, the bypass isolation knife switch Q4 of the starting resistor is also required to be controlled to be automatically closed, and then the converter valve group enters a hot standby state. If the start controller receives the unlocking command of the converter valve group, the converter valve group can be operated to be in an operation state according to the unlocking command. Fig. 6 illustrates a schematic flow chart of an outage control method of a converter valve set according to the present application. In the present embodiment, the shutdown control method includes S21 to S25, which are specifically described as follows:
s21, controlling the converter valve group to enter a hot standby state.
And in the operation process of the converter valve group, if a locking command for locking the converter valve group is received, operating the converter valve group from an operation state to a hot standby state according to the locking command.
S22, opening a valve side switch at the valve side of the converter transformer to perform power-off operation on the converter valve.
The controller of the converter valve bank is provided with a converter valve outage, and then the valve side switch Q90 can be controlled to be disconnected by clicking the converter valve outage button so as to perform outage operation on the converter valve. After the converter valve is powered off, the bypass isolation disconnecting link Q4 of the starting resistor is required to be subjected to switching-off treatment.
S23, opening a network side switch at the network side of the converter transformer so as to perform power-off operation on the converter transformer.
In this step, after receiving a corresponding instruction, the operator of the ac station may manually separate the network side switch W91 to perform the power-off operation on the converter transformer, and in other embodiments, the control system of the ac station may automatically control the network side switch to close.
S24, disconnecting the HVDC connection of the direct current output end of the converter valve.
In this embodiment the breaking step of the HVDC connection is after the de-energizing step of the converter transformer, in other embodiments both may be performed simultaneously. The controller of the converter valve bank is usually provided with an HVDC isolation button, and after S23, only the HVDC isolation button is clicked to execute the HVDC isolation operation, so that the dc side isolation knife gates Q5 and Q6 on both sides (positive pressure side and negative pressure side) of the dc output end of the converter valve can be automatically separated to realize HVDC isolation.
And S25, enabling the converter valve group to enter a hot standby state of an alternating current side of the converter transformer after the converter transformer is powered off and the HVDC connection is disconnected.
After the converter valve group enters the alternating-current side hot standby state, the converter valve group also needs to enter a cold standby state and an overhaul state in sequence according to corresponding operation commands, and the shutdown control of the converter valve group is realized.
In addition, the application also provides a start controller of the converter valve group, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the start control method according to any one embodiment provided by the application when executing the program.
The present application also provides an off-line controller for a converter valve assembly, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the off-line control method according to any one of the embodiments provided herein when executing the program.
Obviously, in the starting control and shutdown control method of the converter valve bank, the charging and disconnecting of the converter transformer and the charging and disconnecting of the converter valve are decoupled, so that the operation of the alternating current station is not coupled in the charging and disconnecting operation of the converter station any more, the charging and disconnecting operation of the converter valve is autonomously controllable by a converter station personnel, the starting and stopping process operation sequence of the whole valve bank is optimized, and the operation efficiency of an operator is improved.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The starting control method of the converter valve bank comprises a converter transformer and a converter valve, wherein an alternating current inlet wire of the converter transformer is connected with an alternating current station, the alternating current station comprises a switch W91 and isolation disconnecting links Q11 and Q12 which are connected with a GIS tubular bus in series, an isolation disconnecting link Q1 is arranged on the net side of the converter transformer, a valve side switch Q90 and isolation disconnecting links Q2 and Q3 are arranged on the valve side of the converter transformer, and isolation disconnecting links Q5 and Q6 are respectively arranged at a positive output end and a negative output end of a direct current side; the method comprises the following steps:
controlling the converter valve group to enter an alternating-current side hot standby state;
HVDC connection is carried out on the direct current output end of the converter valve;
closing a network side switch at the network side and charging the converter transformer;
after the converter transformer is charged, and the direct current output end of the converter valve is connected with the HVDC, closing a valve side switch at the valve side, and charging the converter valve;
after the converter valve is charged, the converter valve group enters a hot standby state;
the control of the converter valve group to enter an alternating-current side hot standby state comprises the following steps:
the isolation disconnecting link Q11 and Q12 in the alternating current station, the isolation disconnecting link Q1 on the converter transformer network side and the isolation disconnecting link Q2 and Q3 on the valve side are both in a closing state;
after the converter transformer is charged, and the direct current output end of the converter valve is connected with the HVDC, a valve side switch at the valve side is closed, and the converter valve is charged, and the converter valve charging method comprises the following steps:
after the converter transformer at the valve side is fully charged and the isolation disconnecting link at the direct current side is in a closing state, the valve side switch is closed, and the converter transformer charges the converter valve.
2. The start-up control method of claim 1, wherein the valve block is a flexible DC valve block,
the network side switch is a wire inlet switch in an alternating current station connected with the converter transformer.
3. The start-up control method of claim 1, wherein after the converter valve is charged, a start-up resistor bypass isolation knife switch between the converter transformer and the converter valve is controlled to close, and the converter valve group enters a hot standby state.
4. The startup control method according to claim 1, characterized by further comprising:
and after the converter valve group enters a hot standby state, operating the converter valve group to an operating state according to an unlocking command.
5. A start-up controller for a converter valve block comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the start-up control method according to any one of claims 1-4 when executing the program.
6. The off-line control method of the converter valve bank comprises a converter transformer and a converter valve, wherein an alternating current inlet wire of the converter transformer is connected with an alternating current station, the alternating current station comprises a switch W91 and isolation disconnecting links Q11 and Q12 which are connected with a GIS tubular bus in series, an isolation disconnecting link Q1 is arranged on the network side of the converter transformer, a valve side switch Q90 and isolation disconnecting links Q2 and Q3 are arranged on the valve side of the converter transformer, and isolation disconnecting links Q5 and Q6 are respectively arranged at a positive output end and a negative output end of a direct current side; the method comprises the following steps:
after the converter valve group enters a hot standby state, a valve side switch at a valve side is disconnected to perform power-off operation on the converter valve;
after the converter valve is powered off, a network side switch is disconnected to perform power-off operation on the converter transformer;
disconnecting the HVDC connection of the direct current output end of the converter valve;
the converter valve group enters an alternating-current side hot standby state after the converter transformer is powered off and the HVDC connection is disconnected; after the converter valve group enters the alternating-current side hot standby state, isolation disconnecting links Q11 and Q12 in the alternating-current station, an isolation disconnecting link Q1 on the converter transformer network side and isolation disconnecting links Q2 and Q3 on the valve side are both in a closing state.
7. The outage control method of claim 6, wherein said valve block is a flexible direct current valve block,
the network side switch is a network side alternating current inlet switch in an alternating current station connected with the converter transformer.
8. The shutdown control method of claim 6 wherein the start-up resistor bypass isolation knife gate between the converter transformer and the converter valve is controlled to separate after the converter valve is de-energized.
9. The outage control method of claim 6, further comprising:
and operating the converter valve group from an operation state to a hot standby state according to a locking command.
10. An off-stream controller for a converter valve block comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the off-stream control method according to any one of claims 6-9 when executing the program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111047007.5A CN113839548B (en) | 2021-09-07 | 2021-09-07 | Method and controller for controlling start-up and shutdown of converter valve group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111047007.5A CN113839548B (en) | 2021-09-07 | 2021-09-07 | Method and controller for controlling start-up and shutdown of converter valve group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113839548A CN113839548A (en) | 2021-12-24 |
| CN113839548B true CN113839548B (en) | 2023-08-08 |
Family
ID=78958628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111047007.5A Active CN113839548B (en) | 2021-09-07 | 2021-09-07 | Method and controller for controlling start-up and shutdown of converter valve group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113839548B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400696B (en) * | 2022-01-28 | 2023-06-20 | 广东电网有限责任公司广州供电局 | Sequential control method and system of back-to-back direct current transmission system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966586A (en) * | 2012-11-30 | 2013-03-13 | 中广核工程有限公司 | Control method for ventilation system of nuclear power station |
| CN103138281A (en) * | 2013-02-26 | 2013-06-05 | 南京南瑞继保电气有限公司 | Method for merging multi-terminal flexile direct current transmission system outage station into operation system |
| CN103280799A (en) * | 2013-05-24 | 2013-09-04 | 南京南瑞继保电气有限公司 | Start-stop method for unified power flow controller |
| CN103618330A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for multi-port flexible high voltage direct current transmission system electrified connection through disconnecting switch |
| KR101407991B1 (en) * | 2014-05-02 | 2014-07-02 | 주식회사 은하 | Emergency valve actuater driver using super capacitor |
| EP2824816A1 (en) * | 2013-07-11 | 2015-01-14 | Dialog Semiconductor GmbH | Switched capacitor dc/dc converter with low input current ripple |
| CN104362662A (en) * | 2014-11-26 | 2015-02-18 | 湖北工业大学 | Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system |
| CN107659192A (en) * | 2017-09-26 | 2018-02-02 | 许继集团有限公司 | A kind of current conversion station and its valve group, which are thrown, moves back process Neutron module pressure equalizing control method |
| CN112491076A (en) * | 2020-11-03 | 2021-03-12 | 南京南瑞继保电气有限公司 | Method and device for starting and stopping distributed series compensator and storage medium |
| CN112600246A (en) * | 2020-12-18 | 2021-04-02 | 全球能源互联网研究院有限公司 | Offshore wind power flexible direct current grid-connected system and starting method thereof |
| CN113178851A (en) * | 2021-05-19 | 2021-07-27 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Method for solving overlarge excitation surge current of flexible direct-current connection transformer |
-
2021
- 2021-09-07 CN CN202111047007.5A patent/CN113839548B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966586A (en) * | 2012-11-30 | 2013-03-13 | 中广核工程有限公司 | Control method for ventilation system of nuclear power station |
| CN103138281A (en) * | 2013-02-26 | 2013-06-05 | 南京南瑞继保电气有限公司 | Method for merging multi-terminal flexile direct current transmission system outage station into operation system |
| CN103280799A (en) * | 2013-05-24 | 2013-09-04 | 南京南瑞继保电气有限公司 | Start-stop method for unified power flow controller |
| EP2824816A1 (en) * | 2013-07-11 | 2015-01-14 | Dialog Semiconductor GmbH | Switched capacitor dc/dc converter with low input current ripple |
| CN103618330A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for multi-port flexible high voltage direct current transmission system electrified connection through disconnecting switch |
| KR101407991B1 (en) * | 2014-05-02 | 2014-07-02 | 주식회사 은하 | Emergency valve actuater driver using super capacitor |
| CN104362662A (en) * | 2014-11-26 | 2015-02-18 | 湖北工业大学 | Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system |
| CN107659192A (en) * | 2017-09-26 | 2018-02-02 | 许继集团有限公司 | A kind of current conversion station and its valve group, which are thrown, moves back process Neutron module pressure equalizing control method |
| CN112491076A (en) * | 2020-11-03 | 2021-03-12 | 南京南瑞继保电气有限公司 | Method and device for starting and stopping distributed series compensator and storage medium |
| CN112600246A (en) * | 2020-12-18 | 2021-04-02 | 全球能源互联网研究院有限公司 | Offshore wind power flexible direct current grid-connected system and starting method thereof |
| CN113178851A (en) * | 2021-05-19 | 2021-07-27 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Method for solving overlarge excitation surge current of flexible direct-current connection transformer |
Non-Patent Citations (1)
| Title |
|---|
| 统一潮流控制器的建模仿真技术研究;陈传宝;中国优秀硕士论文电子期刊网;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113839548A (en) | 2021-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104518564A (en) | Backup automatic switching apparatus with area automatic switching function, and backup automatic switching method | |
| CN110165697B (en) | One-key starting and stopping method and device for multi-terminal flexible direct current power distribution system | |
| CN210780230U (en) | Switch device for switching high power from off-grid to grid-connected | |
| CN109494776A (en) | The grid-connected bidirectional converter of energy-storage system and off-network double mode operation method | |
| CN111245023B (en) | Microgrid parallel-parallel operation switching system and switching method | |
| CN113839548B (en) | Method and controller for controlling start-up and shutdown of converter valve group | |
| EP3890172B1 (en) | Power conversion method, apparatus, and device, and medium | |
| CN108429278B (en) | LCC-MMC system single valve bank input control method and DC power transmission system | |
| CN104485732A (en) | In-put control method for standby powers of transformer substations | |
| CN203632361U (en) | Logic controlling device for 110kV line automatic bus transfer equipment | |
| CN107437795A (en) | The pole ESOF control methods and Hybrid HVDC system of Hybrid HVDC system | |
| CN107944570B (en) | Automatic processing method and device for intelligent substation sequential control atypical state | |
| CN111668871A (en) | AC fault ride-through control method under new energy access flexible DC distribution network system | |
| CN201156680Y (en) | Automatic throw-in equipment of adaptive standby power supply | |
| CN105207346A (en) | Area backup automatic switch method and system | |
| CN107819360A (en) | Bus control loop, device and system | |
| CN116418023A (en) | Control method of energy storage system, energy storage control system and energy storage system | |
| CN114336953B (en) | Control method of energy router, central controller and energy router | |
| CN113937766A (en) | Multi-level networking load control method, system and interactive terminal | |
| CN103728529B (en) | A kind of switch gap condition discrimination method | |
| CN112018788A (en) | Three-phase unbalanced automatic commutation system | |
| CN113488211B (en) | Control method for high-temperature gas cooled reactor plant water system based on MACS6 platform | |
| CN206790077U (en) | A kind of device that mother prepared auto restart is realized with circuit under-voltage protection and reclosing | |
| CN211508636U (en) | Microgrid parallel-parallel/parallel operation switching system | |
| CN102739127A (en) | Solid-state soft-starting device and method of multiple high-voltage motors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |