Pumped storage power station unit electric start control and intertripping method and system based on communication

Abstract

The invention provides a pumped storage power station unit electric start control and intertripping method and system based on communication, and the method comprises the steps: building a communication network for the mutual connection of IED equipment, building various dragging and dragged combination relationships of a unit based on the communication network, compiling the control and intertripping logic during the electric start of the unit, and carrying out the intertripping control of the unit. The dragging and dragged combination relation selected by the current unit is sent to all the IED devices through a communication network, each IED device sends a control or inter-tripping command to the opposite-side IED device, and the opposite-side IED device receives the control or inter-tripping command and executes the control or fault inter-tripping command until the unit completes the electric starting process after the control or inter-tripping command is checked to be correct. And finally, resetting the dragging and dragged combination relationship selected by the current unit. The method can effectively solve the problems that a pumped storage power station adopts a large number of relays and hard wiring to build a bridging loop, the loop is complex, and the problem troubleshooting difficulty is large, and the success rate of unit electric starting and the reliability of the starting process are improved.

Description

Technical Field

[0001] The present invention relates to the field of secondary control and protection of pumped storage power stations, and in particular to a method and system for electric starting control and joint tripping of units in pumped storage power stations based on communication. Background Art

[0002] At present, my country is building a new power system with new energy as the main body, and pumped storage power stations have entered a stage of rapid development. Compared with conventional hydropower plants, the biggest difference in control and protection of pumped storage power stations is that in addition to starting in the power generation direction, the units also have electric direction starting. However, large-capacity pumped storage units themselves cannot be directly started in the electric direction, and need to rely on external equipment to drag to the rated speed before they can be synchronized and connected to the grid.

[0003] At present, there are two main ways to start pumped storage power stations in the electric direction: one is to start by dragging through SFC (Static Frequency Converter), SFC drags the unit from the static state to the rated speed for grid connection by gradually increasing the speed; the other is to establish an electrical connection between the two units in a back-to-back manner, one unit generates electricity to drive the other unit to start electrically, and finally the unit running in electric mode is connected to the grid. Since pumped storage power stations generally have multiple units, there are multiple drag and drag combination relationships between the dragging equipment (SFC or dragging unit) and the dragged unit. The equipment that establishes the combination relationship needs to be coordinated and controlled during the startup process and jump in case of failure, so the control and jump circuits between the two parties need to be selective. At present, the traditional control and jump selective circuit is built by a large number of relays and hard wiring, also known as a bridge circuit. At startup, the corresponding relay is switched according to the drag and drag combination relationship to achieve different combination signal circuit conduction, and the circuit between the equipment that has not established the drag and drag combination relationship is disconnected, but this solution has the following shortcomings:

[0004] (1) Relays and hard-wired circuits are too large and complex, making maintenance inconvenient;

[0005] (2) The relay circuit cannot be monitored. When a relay node fails, it is easy to cause the unit to fail to start, and the fault is not easy to find and troubleshoot;

[0006] (3) The prior art has only one relay output interface, and the relay is used to perform switching in the external circuit regardless of the drag relationship, which easily causes a startup failure due to relay switching failure. Summary of the invention

[0007] In order to solve the deficiencies in the prior art, the present invention provides a method and system for electric starting control and joint tripping of pumped-storage power station units based on communication, which can realize coordinated control and fault joint tripping during the electric direction starting process of the pumped-storage units based on communication, thereby eliminating the hard-wired bridge circuit.

[0008] The present invention adopts the following technical solution.

[0009] A method for electric starting control and joint tripping of a pumped storage power station unit based on communication is provided, wherein a communication network for interconnecting IED devices of a pumped storage power station is established, and based on the communication network, the following execution steps are included:

[0010] S1, establish various drag and drag combination relationships of the unit, and construct the control and joint jump logic when the unit is electrically started;

[0011] S2, publish the dragging and being dragged combination relationship selected by the current unit to all IED devices through the communication network;

[0012] S3, each IED device sends a control or trip command to the opposite IED device;

[0013] S4, the opposite IED device receives the control or trip command and performs verification. After verification, the control or fault trip command is executed until the unit completes the electric start process;

[0014] S5, after the start-up process is completed, the dragging and dragged combination relationship selected by the current unit is restored.

[0015] Preferably, the communication protocol used for communication between the IED devices of the pumped storage power station is the GOOSE protocol, and the communication status of each communication link is monitored in real time, and a communication link disconnection alarm is issued after the link is disconnected.

[0016] Preferably, the IED equipment includes a unit LCU, relay protection, an excitation system, a speed regulator, an SFC, a synchronization device, and an intelligent terminal.

[0017] Preferably, in S1, the dragging and dragged combination relationship of the unit established includes: the dragging and dragged combination relationship between units, or the dragging and dragged combination relationship between a unit and the primary part of the SFC; each unit includes multiple IED devices, and the control of the unit is achieved through the IED devices.

[0018] Preferably, in said S1, the various dragging and dragged combination relationships constructed during the electric starting of the pumped storage power station unit include two categories:

[0019] (1) SFC drive mode, including SFC drive j# unit, where j is the unit number;

[0020] (2) Back-to-back dragging of units, including unit #m dragging unit #n, where m and n are unit numbers, and m≠n.

[0021] Preferably, the control or interlocking commands in S3 include but are not limited to: control commands of the unit LCU to SFC, control commands of the synchronization device to SFC, control commands of the synchronization device to speed regulation, control commands of SFC to excitation, interlocking commands of relay protection to SFC, interlocking commands of relay protection to unit LCU, interlocking commands of unit LCU to SFC, interlocking commands of SFC to unit LCU, tripping and shutdown circuits of back-to-back units, and speed increase and deceleration commands of unit synchronization to speed regulators of back-to-back units.

[0022] Preferably, in S3, the sending side first performs a check before sending a control or joint jump command. The check process is: determine whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the check fails. If yes, the check passes and the command is allowed to be sent.

[0023] After receiving the command, the receiving side performs verification. The verification process is: determine whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the verification fails and the command does not take effect. If so, the verification passes and the command takes effect.

[0024] Preferably, the verification method after each IED device in S4 receives the control or interlocking command of the opposite IED device is: when the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is established, the receiving side IED device executes the control or interlocking command; when the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is not established, the control or interlocking command is not executed.

[0025] A communication-based pumped storage power station unit electric starting control and joint tripping system, used to implement the communication-based pumped storage power station unit electric starting control and joint tripping method, comprising:

[0026] The control and joint jump logic establishment module is used to establish various drag and drag combination relationships of the unit, and construct the control and joint jump logic when the unit is electrically started;

[0027] The information publishing module is used to publish the dragging and dragged combination relationship selected by the current unit to all IED devices through the communication network;

[0028] The command issuing module is used for each IED device to send a control or trip command to the opposite IED device;

[0029] The verification module is used to verify the IED device on the opposite side after receiving the control or trip command;

[0030] The command execution module is used to execute the control or fault trip command after verification until the unit completes the electric start process;

[0031] The reset module is used to reset the dragging and dragged combination relationship selected by the current unit after the startup process is completed.

[0032] The present invention also provides a terminal, including a processor and a storage medium;

[0033] The storage medium is used to store instructions;

[0034] The processor is used to operate according to the instructions to execute the steps of the communication-based pumped storage power station unit electric starting control and joint trip method.

[0035] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the communication-based pumped-storage power station unit electric starting control and joint trip method are implemented.

[0036] The beneficial effect of the present invention lies in that, compared with the prior art, a communication-based electric starting control and interlocking method for pumped-storage power station units provided by the present invention realizes various dragging and dragged combination relationships through wired communication, and information interaction of control and interlocking commands is performed between different IED devices, which can eliminate the bridging circuit constructed by existing relays and hard wiring.

[0037] The present invention has at least the following beneficial effects:

[0038] (1) The relay and hardware line loop are eliminated, and control and linkage are realized through software logic, which has a simple structure. The present invention changes the IED interface and logic implementation method, and expands each signal of the SFC into several soft interfaces, each of which corresponds to several units.

[0039] (2) The communication link status between IED devices can be monitored in real time. When an abnormal link status is found, it can be quickly located and an alarm can be issued, effectively avoiding unit startup failure and improving the success rate and safety of unit startup;

[0040] (3) Signal transmission between IED devices eliminates the relay action and switch quantity collection steps in the existing solution, and is faster than hard wiring.

[0041] (4) The present invention is extended to multiple point-to-point direct signal outputs to avoid startup failures caused by relay switching failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the technical solution of the bridge circuit when SFC is driven in the existing pumped storage power station;

[0043] Figure 2 It is a schematic diagram of the technical solution of the bridge circuit when the existing pumped storage power station is back-to-back dragged;

[0044] Figure 3 It is a schematic diagram of the communication network connection of the present invention;

[0045] Figure 4 It is a flow chart of the electric starting control and joint tripping method of the pumped storage power station unit based on communication of the present invention;

[0046] Figure 5 It is a structural diagram of the electric starting control and joint tripping system of the pumped storage power station unit based on communication of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0048] like Figure 1 , 2 As shown, there are respectively a schematic diagram of the technical solution of the bridge circuit during SFC dragging of the existing pumped-storage power station and a schematic diagram of the technical solution of the bridge circuit during back-to-back dragging of the existing pumped-storage power station. The existing technology uses a bridge circuit built based on relays and hard wiring to control the pumped-storage power station unit. The circuit is complex and easily leads to work failure, and it is also difficult to troubleshoot the fault.

[0049] like Figure 3 As shown, it is a communication network connection diagram of each IED (Intelligent Electronic Device) device of the pumped storage power station of the present invention, which can form a dual network or a single network. Figure 4 The present invention provides a flow chart of the method for electric starting control and joint tripping of pumped storage power station units based on communication, which includes the following steps:

[0050] S1. Establish a communication network that connects the IED devices of each unit of the pumped storage power station, establish various driving and driven combination relationships of the units, and construct the control and joint jump logic when the units are electrically started;

[0051] S2. Publishing the dragging and dragged combination relationship selected by the current unit to all IED devices through the communication network;

[0052] S3, each IED device sends a point-to-point control or joint jump command to the opposite IED device, and the command is directly output to the opposite device without any switching loop signal;

[0053] S4: The IED device on the opposite side will check after receiving the control or trip command, and execute the control or fault trip command after the check is correct until the unit completes the electric start process;

[0054] S5. After the start-up process is completed, the dragging and dragged combination relationship selected by the current unit is restored.

[0055] Among them, the IED devices in the pumped storage power station are connected to each other, and the communication protocol used when the IED devices communicate with each other is preferably the GOOSE protocol.

[0056] IED equipment includes the unit LCU (Local Control Unit), relay protection, excitation system, speed governor, SFC, synchronization device, and intelligent terminal.

[0057] The dragging and dragging combination relationship of the units established in S1 is: the dragging and dragging combination relationship between units, or the dragging and dragging combination relationship between units and SFC; each unit includes multiple IED devices, and the control of the unit is achieved through the IED devices.

[0058] Furthermore, the various dragging and dragged combination relationships constructed in S1 during the electric starting of the pumped storage power station unit include two categories:

[0059] (1) SFC drive mode, including SFC drive j# unit, where j is the unit number;

[0060] (2) Back-to-back dragging of units, including unit #m dragging unit #n, where m and n are unit numbers, and m≠n.

[0061] Take the SFC jump unit as an example:

[0062] In the prior art, the SFC hard tripping outlet is one "SFC tripping", which is expanded to multiple "SFC tripping 1# unit", "SFC tripping 2# unit", "SFC tripping 3# unit" and so on after being implemented in the soft communication mode of the present invention.

[0063] Construct the control and jump logic of the unit during electric starting and include:

[0064] When the control or interlocking command of the IED device is output, the following judgment needs to be made: whether the IED device has established a dragging relationship with the unit to which the other IED device belongs. If so, the control or interlocking command is output; if not, no output is made;

[0065] The check logic is: when the receiving side receives a control or jump command, it determines whether the other IED has established a drag relationship with the unit to which the IED belongs. If so, it is executed; if not, it is not executed.

[0066] The control or jump commands in S3 include:

[0067] The control commands of the unit LCU to the SFC, the control commands of the synchronization device to the SFC, the control commands of the synchronization device to the speed regulation, the control commands of the SFC to the excitation, the inter-trip commands of the relay protection to the SFC, the inter-trip commands of the relay protection to the unit LCU, the inter-trip commands of the unit LCU to the SFC, the inter-trip commands of the SFC to the unit LCU, the tripping and shutdown circuits of the unit to the back-to-back units, the speed increase and deceleration commands of the unit synchronization to the speed regulators of the back-to-back units.

[0068] Further preferably, in step S3, the sending side first performs a check before sending the control or joint jump command to check whether the command should be sent. The checking process is: judging whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the check fails, otherwise, the check passes;

[0069] After receiving the command, the receiving side performs verification. The verification process is: determine whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the command will not take effect, otherwise the command will take effect.

[0070] The verification method after each IED device in S4 receives the control or trip command of the opposite IED device is as follows:

[0071] When the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is established, the receiving side IED device executes the control or joint jump command; when the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is not established, the control or joint jump command is not executed.

[0072] Further, the start-up of unit 1# by SFC dragging is taken as an example for explanation, which includes the following steps:

[0073] S1: Construct various dragging and dragging combination relationships during the electric start of the pumped storage power station unit, that is, the 1# unit selects SFC to start, and compiles the control and joint trip logic during the electric start of the unit. The control and joint trip logic includes but is not limited to the joint trip logic of SFC and the A and B sets of protection of the 1# unit, the control logic of the 1# unit synchronization device and SFC, the control logic of the 1# unit excitation and SFC, and the joint trip logic of the 1# unit LCU and SFC;

[0074] S2. Publish the dragging and dragged combination relationship selected by the current unit to all IED devices through the communication network, that is, publish the signal of SFC dragging unit 1# to the unit protection, unit LCU, and SFC device;

[0075] S3, each IED device sends a control or interlocking command to the opposite IED device according to the control and interlocking logic constructed in step S2 and the currently received dragging and being dragged combination relationship issued in step S3;

[0076] S4: The IED device on the opposite side performs verification after receiving the control or trip command. When the verification is correct, the control or fault trip command is executed until the unit completes the electric start process;

[0077] S5. Restore the dragging and dragged combination relationship selected by the current unit, and lock the control and linkage between the IED devices.

[0078] In the above technical scheme, information transmission between different IED devices is realized through communication. Since GOOSE communication adopts a publish-subscribe mechanism and has the advantage of fast transmission speed, it is suitable for many-to-many information interaction. The present invention preferably uses the GOOSE communication scheme, which comprehensively solves the problem of complex circuits built by relays and hard wiring in the prior art, thereby improving the reliability of the operation of the pumped storage power station and the convenience of maintenance.

[0079] like Figure 5 As shown, the present invention also proposes a communication-based pumped storage power station unit electric starting control and tripping device, which can implement the above method, and the system includes:

[0080] The control and joint jump logic establishment module is used to establish various drag and drag combination relationships of the unit, and construct the control and joint jump logic when the unit is electrically started;

[0081] The information publishing module is used to publish the dragging and dragged combination relationship selected by the current unit to all IED devices through the communication network;

[0082] The command issuing module is used for each IED device to send a control or trip command to the opposite IED device;

[0083] The verification module is used to verify the IED device on the opposite side after receiving the control or trip command;

[0084] The command execution module is used to execute the control or fault trip command after verification until the unit completes the electric start process;

[0085] The reset module is used to reset the dragging and dragged combination relationship selected by the current unit after the startup process is completed.

[0086] The beneficial effect of the present invention is that, compared with the prior art, when the present invention realizes various dragging and dragged combination relationships through wired communication, information interaction of control and jump commands between different IED devices can be performed, and the bridging circuit constructed by existing relays and hard wiring can be eliminated.

[0087] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0088] Computer readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. Computer readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive lists) of computer readable storage medium include: portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), static random access memories (SRAM), portable compact disk read-only memories (CD-ROM), digital versatile disks (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or convex structures in grooves on which instructions are stored, and any suitable combination thereof. Computer readable storage medium used here is not interpreted as a transient signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagated by waveguides or other transmission media (e.g., light pulses by optical fiber cables), or electrical signals transmitted by wires.

[0089] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0090] The computer program instructions for performing the disclosed operation may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, executed as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA) may be personalized by utilizing the state information of a computer-readable program instruction, and the electronic circuit may execute a computer-readable program instruction, thereby realizing various aspects of the present disclosure.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for electric starting control and joint tripping of pumped storage power station units based on communication, characterized in that: A communication network is established to interconnect the IED devices of the pumped storage power station. Based on the communication network, the following execution steps are included: S1, establish various drag and drag combination relationships of the unit, and construct the control and joint jump logic when the unit is electrically started; S2, publish the dragging and being dragged combination relationship selected by the current unit to all IED devices through the communication network; s3, each IED device sends a control or trip command to the opposite IED device; S4, the opposite IED device receives the control or trip command and performs verification. After verification, the control or fault trip command is executed until the unit completes the electric start process; S5, after the start-up process is completed, the dragging and dragged combination relationship selected by the current unit is restored.

2. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 1, characterized in that: The communication protocol used for communication between the IED devices in the pumped storage power station is the GOOSE protocol, and the communication status of each communication link is monitored in real time, and a communication link disconnection alarm is issued after the link is disconnected.

3. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 1, characterized in that: The IED equipment includes unit LCU, relay protection, excitation system, speed governor, SFC, synchronization device and intelligent terminal.

4. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 1, characterized in that: In S1, the dragging and dragged combination relationship of the units established includes: the dragging and dragged combination relationship between units, and the dragging and dragged combination relationship between the unit and the primary part of the SFC; each unit includes multiple IED devices, and the control of the unit is achieved through the IED devices.

5. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 4, characterized in that: In S1, the various dragging and dragged combination relationships constructed during the electric starting of the pumped storage power station unit include two categories: (1) SFC drive mode, including SFC drive j# unit, where j is the unit number; (2) Back-to-back dragging of units, including unit #m dragging unit #n, where m and n are unit numbers, and m≠n.

6. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 1, characterized in that: The control or joint trip commands in S3 include: control commands of the unit LCU to the SFC, control commands of the synchronization device to the SFC, control commands of the synchronization device to the speed regulation, control commands of the SFC to the excitation, joint trip commands of the relay protection to the SFC, joint trip commands of the relay protection to the unit LCU, joint trip commands of the unit LCU to the SFC, joint trip commands of the SFC to the unit LCU, tripping and shutdown circuits of the unit to back-to-back units, and speed increase and deceleration commands of the unit synchronization to the speed regulators of the back-to-back units.

7. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 6, characterized in that: In S3, the sending side first performs a check before sending a control or joint jump command. The check process is: determine whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the check fails. If so, the check passes and the command is allowed to be sent. After receiving the command, the receiving side performs verification, and the verification process includes: determining whether a drag relationship is established between the unit on the sending side and the unit on the receiving side. If not, the verification fails and the command does not take effect. If so, the verification passes and the command takes effect.

8. The method for electric starting control and joint tripping of pumped storage power station units based on communication according to claim 1, characterized in that: The verification method after each IED device in S4 receives the control or interlocking command of the opposite IED device is as follows: when the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is established, the receiving side IED device executes the control or interlocking command; when the dragging and being dragged combination relationship between the sending side IED device and the receiving side IED device is not established, the control or interlocking command is not executed.

9. A communication-based pumped storage power station unit electric starting control and joint trip system, used to implement the communication-based pumped storage power station unit electric starting control and joint trip method according to any one of claims 1 to 8, characterized in that: include: The control and joint jump logic establishment module is used to establish various drag and drag combination relationships of the unit, and construct the control and joint jump logic when the unit is electrically started; The information publishing module is used to publish the dragging and dragged combination relationship selected by the current unit to all IED devices through the communication network; The command issuing module is used for each IED device to send a control or trip command to the opposite IED device; The verification module is used to verify the IED device on the opposite side after receiving the control or trip command; The command execution module is used to execute the control or fault trip command after verification until the unit completes the electric start process; The reset module is used to reset the dragging and dragged combination relationship selected by the current unit after the startup process is completed.

10. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-9.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

Images