Variable-speed pumped storage unit control system and method combining GOOSE network and hard wiring

Abstract

The invention discloses a variable-speed pumped storage unit control system and method combining a GOOSE network and hard wiring, and the system comprises a monitoring system, a coordination controller, an AC excitation device, a speed regulator device, and a protection device. The monitoring system, the coordination controller, the alternating current excitation device, the speed regulator device and the protection device communicate with one another through GOOSE and hard wiring at the same time. The monitoring system, the coordination controller, the alternating current excitation device, the speed regulator device and the protection device are connected with the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected with the monitoring system through the coordination controller, the alternating current excitation device, the speed regulator device and the protection device in a hard wiring mode. The technical problems that a control system of an existing pumped storage power station is hard-wired, a relay loop is complex, and operation and maintenance are difficult can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of intelligent pumped storage power stations, and in particular relates to a control system and method for a variable speed pumped storage unit combining a GOOSE network and hard wiring. Background Art

[0002] As the global energy structure transforms toward green and low-carbon, the access capacity of new energy sources such as wind power and solar power continues to increase. Due to the intermittent nature of new energy power generation, higher requirements are placed on the stability and regulation capabilities of the power grid. Pumped storage power stations play a vital role in peak-to-valley regulation, frequency and phase regulation, and new energy storage of power systems, and are currently experiencing great development. However, pumped storage power stations currently mainly use fixed-speed units, whose speed is fixedly coupled to the grid frequency, resulting in significant limitations in the units when regulating the grid load. Variable-speed units can decouple the unit speed from the grid frequency, making regulation more flexible, and are a research and development hotspot in the pumped storage industry.

[0003] Variable speed pumped storage units need to comprehensively control the active power, reactive power, speed, etc. of the units according to the operating conditions to ensure that the units can operate efficiently and stably under different operating conditions. This requires a large amount of real-time data interaction and advanced control strategies between the monitoring system, coordination controller, speed regulator and AC excitation device to achieve the optimal operating state.

[0004] Early pumped storage power stations mostly used hard wiring and relay circuits to achieve information exchange, which was not only complex in structure but also difficult to maintain. With the development of computer technology and communication technology, digital, networked, and intelligent control systems have gradually become mainstream. Summary of the invention

[0005] The purpose of the present invention is to provide a variable speed pumped storage unit control system and method combining GOOSE network and hard wiring, so as to solve the technical problems of complex hard wiring and relay circuits and difficult operation and maintenance of the current pumped storage power station control system.

[0006] In order to achieve the above object, the solution of the present invention is:

[0007] A variable speed pumped storage unit control system combining a GOOSE network and hard wiring comprises a monitoring system, a coordination controller, an AC excitation device, a speed regulator device and a protection device, wherein the monitoring system, the coordination controller, the AC excitation device, the speed regulator device and the protection device communicate with each other simultaneously using GOOSE and hard wiring.

[0008] The above monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system through the coordination controller, AC excitation device, speed regulator device and protection device hard wiring.

[0009] When the above systems fail, the monitoring system sends the emergency shutdown action signal to the coordination controller, AC excitation device, speed regulator device and protection device through the GOOSE network and hard wiring at the same time.

[0010] The above GOOSE process layer network adopts dual network redundant configuration, and the GOOSE network interface boards of the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are redundantly configured, and the A and B network ports are respectively connected to the redundant GOOSE A and B network switches.

[0011] During the normal operation of the above-mentioned unit, when the coordination controller is normal, the monitoring system forwards the received dispatching load instructions to the coordination controller, and the coordination controller respectively sends target instructions to the AC excitation device and the speed regulator device after optimization; when the coordination controller fails, the monitoring system sends target instructions to the AC excitation device and the speed regulator device respectively based on the received dispatching load instructions.

[0012] During the above-mentioned unit operating condition conversion process, each control device monitors the network interaction status with the associated equipment in real time. When any control device detects that the network of the associated equipment is interrupted, it sends the unit shutdown protection after a delay.

[0013] The monitoring system monitors in real time whether the control target values ​​of the AC excitation device and the speed regulator device are consistent with the set values ​​of the coordination controller. When the two are inconsistent and after a delay, the shutdown process is triggered.

[0014] The control method of the variable speed pumped storage unit control system combining the GOOSE network and hard wiring as described above comprises:

[0015] The monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system through the coordination controller, AC excitation device, speed regulator device and protection device hard wiring.

[0016] Among them, during the normal operation of the unit, when the coordination controller is normal, the monitoring system forwards the received dispatching load instructions to the coordination controller, and the coordination controller respectively sends target instructions to the AC excitation device and the speed regulator device after optimization; when the coordination controller fails, the monitoring system sends target instructions to the AC excitation device and the speed regulator device respectively based on the received dispatching load instructions.

[0017] Among them, during the unit operating condition conversion process, each control device monitors the network interaction status with the associated equipment in real time. When any control device detects that the network of the associated equipment is interrupted, it sends the unit shutdown protection after a delay.

[0018] After adopting the above scheme, the present invention combines the GOOSE network and the hard-wired communication mode. Under normal circumstances, the working condition conversion and load adjustment of the variable speed pumped storage unit are carried out through GOOSE communication. When an accident occurs, the GOOSE signal and the hard-wired signal will act at the same time to trigger the unit shutdown process to ensure the reliability of the control system. The present invention realizes the rapid message communication between the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device of the variable speed pumped storage unit while ensuring reliability through the GOOSE process layer network. The complex hard wiring and relay circuits are greatly simplified through the GOOSE network digital acquisition method. Automatic power generation control, automatic pumping control and rapid protection action in the event of an accident of the variable speed pumped storage unit are realized.

[0019] The beneficial effects of the present invention are embodied in:

[0020] 1) The GOOSE network is used for digital transmission at the process layer, eliminating complex hard wiring and relay circuits, making operation and maintenance easier and facilitating system expansion.

[0021] 2) Utilize the rapidity of GOOSE millisecond-level message transmission to ensure the control speed and accuracy of the variable-speed unit, and provide reliability and speed during the operating condition conversion and load adjustment of the variable-speed pumped storage unit.

[0022] 3) The control system adopts a redundant GOOSE network, with complete redundancy from device ports to physical links, ensuring high system reliability.

[0023] 4) By utilizing the broadcasting nature of GOOSE messages, it is possible to compare multiple signals, ensuring that an alarm is issued when any device collects data abnormally, and that the machine is shut down quickly when necessary.

[0024] 5) When the coordination controller is abnormal, the control system can use the GOOSE information sharing mechanism to replace the function of the coordination controller with the monitoring system to directly control the AC excitation and speed regulator, maintain the current operating status or execute the shutdown process, and improve the robustness of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall framework diagram of a variable speed pumped storage unit control system combining a GOOSE network and hard wiring in the present invention. DETAILED DESCRIPTION

[0026] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] As a communication protocol based on the IEC61850 standard, the GOOSE (Generic Object Oriented Substation Events) network has been widely used in substation automation systems due to its high reliability, speed and flexibility. Introducing the GOOSE network into the control system of variable-speed pumped storage units can achieve efficient data interaction between devices, simplify complex hard wiring and relay circuits, and improve the flexibility and maintainability of the system. At the same time, combined with hard wiring as a backup means, the reliability and safety of the system can be further improved.

[0028] like Figure 1 As shown, this embodiment proposes a variable speed pumped storage unit control system combining a GOOSE network and hard wiring, the control system includes: a monitoring system, a coordination controller, an AC excitation device, a speed regulator device and a protection device. Among them:

[0029] The monitoring system, coordination controller, AC excitation device, speed regulator device and protection device communicate with each other simultaneously using GOOSE and hard wiring; specifically, the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch via a GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system via hard wiring of the coordination controller, AC excitation device, speed regulator device and protection device.

[0030] The GOOSE network is used for rapid control of the system, simplifies complex hard wiring and relay circuits, and realizes automatic power generation control and automatic pumping control of variable speed pumped storage units. When the variable speed pumped storage unit undergoes a working condition conversion, the monitoring system directly sends control instructions to the coordination controller, AC excitation device, speed regulator device, and protection device through the GOOSE network. Taking startup as an example, when the monitoring system receives a startup instruction from the operator, the monitoring system sends a speed regulator startup command to the speed regulator device through the GOOSE network, and sends an excitation start instruction to the AC excitation device.

[0031] The GOOSE network is used for rapid control of the system to achieve rapid regulation of active power, reactive power, speed, etc. When the variable speed pumped storage unit is performing load regulation, the monitoring system directly sends the load command to the coordination controller through the GOOSE network. The coordination controller calculates the unit speed and guide vane opening according to the load command, water head and other parameters and sends them to the AC excitation device and the speed regulator device, thereby achieving load regulation of the variable speed pumped storage unit.

[0032] The hard wiring serves as a backup protection for the control system. When the AC excitation device, coordination controller, speed regulator device, and protection device fail, it triggers the rapid shutdown of the unit to provide the reliability of the control system. When a system failure occurs, the monitoring system sends an emergency shutdown action signal to the coordination controller, AC excitation device, speed regulator device, and protection device through the GOOSE network and hard wiring at the same time.

[0033] Preferably, the process layer network adopts a dual-network redundant configuration, the GOOSE network interface boards of the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are redundantly configured, and the A and B network ports are respectively connected to the redundant GOOSEA and B network switches. The process layer network realizes complete redundancy of devices and links to ensure the reliability of the control system.

[0034] Preferably, during the normal operation of the unit, when the coordination controller is normal, the monitoring system receives the dispatch load instruction and forwards it to the coordination controller, and after the coordination controller finds the optimal solution, it issues target instructions to the AC excitation and speed regulator for control respectively; when the coordination controller fails, due to the GOOSE information sharing mechanism, the monitoring system can replace the function of the coordination controller, directly control the AC excitation and speed regulator, and maintain the current operating status or execute the shutdown process.

[0035] Preferably, during the unit operating condition conversion process, the control system monitors the network interaction status with the associated equipment through the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device in real time. When any control device detects that the network of the associated equipment is interrupted, the unit shutdown protection is sent after a delay.

[0036] Preferably, the monitoring system monitors in real time whether the control target constants of the AC excitation and speed regulator are consistent with the set values ​​of the coordination controller. When the two are inconsistent and after a delay, the shutdown process is triggered to avoid damage to the unit due to mismatched customized settings and improve system safety.

[0037] The present invention also provides a control method based on the aforementioned variable speed pumped storage unit control system combining the GOOSE network and hard wiring, comprising:

[0038] The monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system through the coordination controller, AC excitation device, speed regulator device and protection device hard wiring.

[0039] Among them, during the normal operation of the unit, when the coordination controller is normal, the monitoring system forwards the received dispatching load instructions to the coordination controller, and the coordination controller respectively sends target instructions to the AC excitation device and the speed regulator device after optimization; when the coordination controller fails, the monitoring system sends target instructions to the AC excitation device and the speed regulator device respectively based on the received dispatching load instructions.

[0040] Among them, during the unit operating condition conversion process, each control device monitors the network interaction status with the associated equipment in real time. When any control device detects that the network of the associated equipment is interrupted, it sends the unit shutdown protection after a delay.

[0041] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0042] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0043] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0044] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0045] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0046] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A variable speed pumped storage unit control system combining GOOSE network and hard wiring, characterized in that: It includes a monitoring system, a coordination controller, an AC excitation device, a speed regulator device and a protection device, wherein the monitoring system, the coordination controller, the AC excitation device, the speed regulator device and the protection device communicate with each other simultaneously by using GOOSE and hard wiring.

2. The system according to claim 1, characterized in that: The monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system through the coordination controller, AC excitation device, speed regulator device and protection device hard wiring.

3. The system according to claim 2, characterized in that: When the system fails, the monitoring system simultaneously sends the emergency shutdown action signal to the coordination controller, AC excitation device, speed regulator device and protection device through the GOOSE network and hard wiring.

4. The system according to claim 2, characterized in that: The GOOSE process layer network adopts a dual network redundant configuration, and the GOOSE network interface boards of the monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are redundantly configured, and the A and B network ports are respectively connected to the redundant GOOSE A and B network switches.

5. The system according to claim 2, characterized in that: During the normal operation of the unit, when the coordination controller is normal, the monitoring system forwards the received dispatching load instructions to the coordination controller, and the coordination controller respectively sends target instructions to the AC excitation device and the speed regulator device after optimization; when the coordination controller fails, the monitoring system sends target instructions to the AC excitation device and the speed regulator device respectively based on the received dispatching load instructions.

6. The system according to claim 2, characterized in that: During the unit operating condition conversion process, each control device monitors the network interaction status with the associated devices in real time. When any control device detects that the network of the associated device is interrupted, it sends the unit shutdown protection after a delay.

7. The system according to claim 2, characterized in that: The monitoring system monitors in real time whether the control target values ​​of the AC excitation device and the speed regulator device are consistent with the set values ​​of the coordination controller, and triggers the shutdown process after a delay when the two are inconsistent.

8. The control method of the variable speed pumped storage unit control system combining the GOOSE network and hard wiring as claimed in claim 1, characterized in that: include, The monitoring system, coordination controller, AC excitation device, speed regulator device and protection device are connected to the GOOSE switch through the GOOSE communication interface board to form a GOOSE process layer network, and are directly connected to the monitoring system through the coordination controller, AC excitation device, speed regulator device and protection device hard wiring.

9. The control method according to claim 8, characterized in that: During normal operation of the unit, when the coordination controller is normal, the monitoring system forwards the received dispatching load instructions to the coordination controller, and the coordination controller respectively sends target instructions to the AC excitation device and the speed regulator device after optimization; when the coordination controller fails, the monitoring system sends target instructions to the AC excitation device and the speed regulator device respectively based on the received dispatching load instructions.

10. The control method according to claim 8, characterized in that: During the unit operating condition conversion process, each control device monitors the network interaction status with the associated equipment in real time. When any control device detects that the network of the associated equipment is interrupted, it sends the unit shutdown protection after a delay.

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