Out-of-step oscillation monitoring equipment for power system
By designing a device for monitoring out-of-step oscillations in power systems, the device can monitor the power system status in real time and automatically execute GIS equipment tripping commands. This solves the problems of insufficient accuracy and immediacy in existing out-of-step oscillation monitoring technologies, and achieves rapid fault isolation and improved system stability.
Patent Information
- Application Number
- CN202423174002.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-23
AI Technical Summary
The existing power system lacks the accuracy and immediacy to quickly locate the source of the fault in real time after the occurrence of out-of-step oscillations, resulting in time-consuming and labor-intensive maintenance personnel and increased operation and maintenance costs.
Design a step-out oscillation monitoring device that includes a main control module, an input module, an AC module, and a GIS interface module. By acquiring voltage and current signals of the power system in real time, identifying phase angle changes, and automatically executing GIS equipment tripping commands, the device can quickly isolate fault areas.
It enables rapid and accurate positioning and tripping of the power system during out-of-step oscillations, reducing the risk of fault propagation and improving system stability and safety.
Smart Images
Figure CN223942483U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power system technology, specifically relating to a device for monitoring out-of-step oscillations in power systems. Background Technology
[0002] In the context of complex and ever-changing geographical and climatic environments, the stable operation of large power systems faces significant challenges. Therefore, ensuring their stability and security is of paramount importance. When power systems experience out-of-synchronization oscillations, the ability to monitor abnormalities in real time and accurately, and to issue early warnings promptly, is crucial for maintenance personnel to quickly locate fault points and implement appropriate dispatching measures.
[0003] However, existing maintenance and stabilization technologies still have shortcomings in real-time monitoring and rapid alarm location. After out-of-synchronization oscillations occur, even if the system can issue an alarm signal, it often lacks sufficient accuracy and immediacy, making it difficult for maintenance personnel to quickly pinpoint the source of the fault. This means that after disconnecting the faulty unit, maintenance personnel still need to check each unit one by one, which is not only time-consuming and labor-intensive, but also greatly increases operation and maintenance costs. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a device for monitoring out-of-step oscillations in power systems, which monitors the operating status of the power system in real time and immediately executes the GIS equipment tripping command once out-of-step oscillations are detected.
[0005] This utility model provides the following technical solution:
[0006] A device for monitoring out-of-step oscillations in a power system includes a main control module, an input module, an AC module, and a GIS interface module. The input module is connected to the main control module and is used to acquire voltage and current signals from functional pressure plates in the power system. The AC module is connected to the main control module and is used to acquire voltage and current signals from external power tie lines. The GIS interface module is connected to the main control module and an external GIS device for controlling the switching of the GIS device.
[0007] As an optional technical solution of this utility model, the input end of the input module is connected to the functional pressure plate in the power system, and the output end is connected to the main control module, so as to input the voltage and current signals of the functional pressure plate to the main control module.
[0008] As an optional technical solution of this utility model, the main control module includes a central processing unit, an A / D conversion circuit, and a low-pass filter circuit connected in sequence.
[0009] As an optional technical solution of this utility model, the output terminal of the AC module is connected to a low-pass filter circuit, and the voltage and current signals of the external power line are input into the low-pass filter circuit.
[0010] As an optional technical solution of this utility model, the AC module includes a voltage transformer circuit and a current transformer circuit; the voltage transformer circuit is connected to the power tie line to collect voltage signals, and the current transformer circuit is connected to the power tie line to collect current signals; the output terminals of both the voltage transformer circuit and the current transformer circuit are connected to a low-pass filter circuit.
[0011] As an optional technical solution of this utility model, the GIS interface module includes a circuit breaker control unit for switching GIS equipment; the circuit breaker control unit is provided with multiple tripping modules, and tripping relays are installed on the tripping modules, and the switching of GIS equipment is controlled by the on / off state of the tripping relays.
[0012] As an optional technical solution of this utility model, it also includes a display module, which is connected to the main control module and is used to display the out-of-step oscillation monitoring results of the power system.
[0013] As an optional technical solution of this utility model, the input module, the communication module and the GIS interface module are all connected to the main control module through the motherboard.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] This utility model provides a power system out-of-step oscillation monitoring device. The main control module receives voltage and current signals from the functional pressure plate and the external power tie line to determine in real time whether the power system is experiencing out-of-step oscillation, and issues a GIS device tripping command when out-of-step oscillation occurs. The GIS interface module enables the GIS device to be tightly integrated into the monitoring device. The GIS interface module receives commands from the main control module to achieve remote monitoring and switching control of the GIS device, monitors the power system operating status in real time, and immediately executes the GIS device tripping command once out-of-step oscillation is detected to isolate the fault area, prevent the fault from spreading, and ensure the overall stability and safety of the power system. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the out-of-step oscillation monitoring device in an embodiment of this utility model;
[0017] Figure 2 This is a schematic diagram of the structure of the main control module and the AC module in this embodiment of the utility model. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.
[0019] Example 1
[0020] This embodiment provides a device for monitoring out-of-step oscillations in power systems, such as... Figure 1 As shown, it includes a main control module, an input module, an communication module, a GIS interface module, and a display module.
[0021] The input module is connected to the main control module and is used to collect voltage and current signals from the functional pressure plates in the power system.
[0022] The AC module is connected to the main control module and is used to collect voltage and current signals from external power tie lines of the power system.
[0023] The GIS interface module connects the main control module and the GIS equipment outside the monitoring equipment, and is used to control the switching of the GIS equipment.
[0024] The display module is connected to the main control module and is used to display the monitoring results of out-of-synchronous oscillations in the power system. The input terminal of the display module is connected to the main control module via a synchronous serial communication bus, and the output terminal is connected to a display screen.
[0025] Working principle:
[0026] The main control module receives voltage and current signals from the functional pressure plate and the external power tie line. It analyzes and processes these signals to calculate the phase angle of each line. By comparing the phase angles of the lines or equipment at preset points, it identifies the trend and differences in phase angle changes. When the phase angle change exceeds a preset threshold, it accurately locates the out-of-synchronization line and sends a tripping command to the GIS interface module based on the out-of-synchronization line information. The GIS interface module then disconnects the GIS equipment. Simultaneously, the position indicators or sensors in the GIS equipment input short-circuit status signal data to the main control module through the GIS interface module, enabling the main control module to obtain accurate status information of the circuit breaker in real time. The position indicators or sensors continuously and stably monitor the status of the circuit breaker. Once the circuit breaker completes the tripping operation, these devices feed back the circuit breaker status signal to the main control module through the GIS signal interface module. Upon receiving these signals, the main control module initiates the corresponding fault handling process and synchronously uploads the short-circuit status signal data.
[0027] Example 2
[0028] Based on Example 1, the input module, the communication module, and the GIS interface module are all connected to the main control module through a motherboard. The motherboard provides the necessary power supply and I / O bus interfaces to ensure smooth communication between the modules.
[0029] The input module connects to the functional pressure plate in the power system at its input terminal and to the main control module at its output terminal, transmitting the voltage and current signals from the functional pressure plate to the main control module via an I / O bus interface. Specifically, the voltage and current signals from the functional pressure plate are converted into digital signals and then input to the main control module.
[0030] like Figure 2 As shown, the main control module includes a central processing unit, an A / D conversion circuit, and a low-pass filter circuit connected in sequence. The output of the AC module is connected to the low-pass filter circuit, inputting the voltage and current signals from the external power line into the low-pass filter circuit. In this embodiment, the main control module uses a high-performance 32-bit CPU with floating-point registers and an FPGA industrial-grade chip with a main frequency of 400MHz, externally expanded with 32MB NOR FLASH, 256MB NAND FLASH, and 64MB SDRAM to meet the sampling requirement of 24 points per cycle of the power frequency signal.
[0031] like Figure 2 As shown, the AC module includes a voltage transformer circuit and a current transformer circuit. The voltage transformer circuit is connected to the power tie line to collect voltage signals, and the current transformer circuit is connected to the power tie line to collect current signals. The output terminals of both the voltage transformer circuit and the current transformer circuit are connected to a low-pass filter circuit. In this embodiment, the voltage transformer is model JDZ(X)-10, and the current transformer is model AKH-0.66 / Z to meet the requirements for collecting multi-circuit voltage and power signals in low-voltage systems.
[0032] Furthermore, the voltage and current signals acquired by the AC module are first converted into ±5V signals measurable by the analog-to-digital converter through a protective low-voltage transformer, and then converted into digital signals through a low-pass filter circuit and an A / D conversion circuit, and input to the central processing unit for sampling.
[0033] In this embodiment, the main control module is equipped with an optical longitudinal communication interface for connecting to the out-of-synchronization control master station. When the monitoring equipment detects a loss of synchronization on the local line, the main control module connects to the out-of-synchronization control master station through this interface and uploads the out-of-synchronization information. Simultaneously, the main control module receives a confirmation disconnection command sent by the out-of-synchronization control master station and transmits this command to the GIS interface module for switching.
[0034] The GIS interface module includes a circuit breaker control unit for switching GIS equipment. The circuit breaker control unit contains multiple tripping modules, each equipped with a tripping relay. The switching of the GIS equipment is controlled by the on / off state of the tripping relays. In this embodiment, the GIS equipment uses the ZF16-252 model with a minimum bay width of 2.1 meters, which is miniaturized, integrated, and suitable for complex and changing external environments. Internally, it is equipped with ZF6A-252(L) / Y3150,4000-50 circuit breakers, employing a hydraulic spring operating mechanism for transmission line control and protection. The tripping relays use SACE Emax series circuit breakers for rapid tripping under fault conditions.
[0035] In this embodiment, after receiving the tripping command from the main control module, the GIS interface module immediately activates the circuit breaker control unit. Upon receiving the tripping signal, the circuit breaker control unit immediately activates the tripping relay in the tripping circuit to disconnect the connection circuit between the GIS equipment and the GIS interface module. The GIS equipment uses the ZF16-252GIS, which has the advantages of small footprint and strong switching capability.
[0036] The display module is connected to the main control module via a synchronous serial communication bus on the motherboard, and they communicate using the HDLC protocol. The display module's outputs are connected to the display panel, providing display, communication, time synchronization, keyboard, and print interfaces for easy printer and human-machine interface management. The display screen uses a resistive-capacitive touchscreen and an industrial-grade wide-temperature LCD to withstand various harsh environments.
[0037] Working principle:
[0038] The voltage and current on the power tie line are first introduced into the AC module, where they are converted into ±5V low-voltage AC signals. These signals are then sent to the main control module, where they undergo low-pass filtering and an A / D conversion circuit to become digital signals that are transmitted to the central processing unit. Simultaneously, the input module collects the input signals from the functional pressure plate, converts them into digital quantities, and transmits them to the main control module. When the power grid experiences a loss of synchronization, the main control module can determine if the line is in a loss-of-synchronization state. Once a loss of synchronization is confirmed, the main control module transmits the information to the control master station in real time via the optical communication interface. Upon receiving the tripping command from the master station, the main control module immediately outputs a tripping signal. The GIS signal module receives this signal and issues an instruction to activate the circuit breaker control unit. Once the circuit breaker control unit receives the instruction, it quickly activates the tripping circuit, disconnecting the circuit and thus achieving the system's tripping operation.
[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A device for monitoring out-of-step oscillations in power systems, characterized in that: It includes a main control module, an input module, an communication module, and a GIS interface module; The input module is connected to the main control module and is used to collect voltage and current signals from the functional pressure plates in the power system. The AC module is connected to the main control module and is used to collect voltage and current signals from external power tie lines of the power system. The GIS interface module connects the main control module and the GIS equipment outside the monitoring equipment, and is used to control the switching of the GIS equipment.
2. The out-of-step oscillation monitoring device for power systems according to claim 1, characterized in that: The input module's input terminal is connected to the functional pressure plate in the power system, and its output terminal is connected to the main control module, inputting the voltage and current signals from the functional pressure plate to the main control module.
3. The out-of-step oscillation monitoring device for power systems according to claim 1, characterized in that: The main control module includes a central processing unit, an A / D conversion circuit, and a low-pass filter circuit connected in sequence.
4. The out-of-step oscillation monitoring device for power systems according to claim 3, characterized in that: The output of the AC module is connected to a low-pass filter circuit, which inputs the voltage and current signals of the external power line into the low-pass filter circuit.
5. The out-of-step oscillation monitoring device for power systems according to claim 4, characterized in that: The AC module includes a voltage transformer circuit and a current transformer circuit; The voltage transformer circuit is connected to the power tie line to collect voltage signals, and the current transformer circuit is connected to the power tie line to collect current signals; the output terminals of both the voltage transformer circuit and the current transformer circuit are connected to a low-pass filter circuit.
6. The out-of-step oscillation monitoring device for power systems according to claim 1, characterized in that: The GIS interface module includes a circuit breaker control unit for switching GIS equipment. The circuit breaker control unit is equipped with multiple tripping modules, each with a tripping relay. The switching on and off of the GIS equipment is controlled by the tripping relay.
7. The out-of-step oscillation monitoring device for power systems according to claim 1, characterized in that: It also includes a display module, which is connected to the main control module, and is used to display the out-of-step oscillation monitoring results of the power system.
8. The out-of-step oscillation monitoring device for power systems according to claim 1, characterized in that: The input module, communication module, and GIS interface module are all connected to the main control module via a motherboard.