CN104931836A - Power grid monitoring and early warning system - Google Patents
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Abstract
Description
技术领域 technical field
本发明涉及电网监控技术领域,尤其涉及一种电网监控与预警系统。 The invention relates to the technical field of power grid monitoring, in particular to a power grid monitoring and early warning system.
背景技术 Background technique
随着现代电力电子工业的发展,大容量非线性电力负荷的大量增加及电力系统长期超负荷运行,对电力系统的影响及其引发的事故日益受到人们的关注,电网谐波不仅会对继电保护、通信设备、电子仪器等产生不良影响,谐波污染也会大大增加电网的故障率,降低电网的可靠性,对电网质量造成严重影响,长期以来,由于我国电力严重不足,电力系统始终处于严重超负荷运行状态,存在各种不可预测的隐患,近年来美国、欧洲和俄罗斯电力大停电事故为我国电力系统敲响了警钟,因此,对于电力系统瞬间状态变化预测,计算电力系统的隐患事故与突发故障的可能性,对电网运行状态进行评估、报警和自动控制,并将信息快速传输给运行管理者与决策层,避免隐患故障的发生,或者将故障的损失限制在最小范围内,是本领域急需解决的问题。 With the development of the modern power electronics industry, the massive increase of large-capacity non-linear power loads and the long-term overload operation of the power system, the impact on the power system and the accidents caused by it have attracted increasing attention. The harmonics of the power grid will not only affect the relay Harmonic pollution will also greatly increase the failure rate of the power grid, reduce the reliability of the power grid, and seriously affect the quality of the power grid. For a long time, due to the serious shortage of power in my country, the power system has always been in the There are various unpredictable hidden dangers in the state of severe overload operation. In recent years, the power blackouts in the United States, Europe and Russia have sounded the alarm for my country's power system. With regard to the possibility of unexpected failures, evaluate, alarm and automatically control the operating status of the power grid, and quickly transmit the information to the operation manager and decision-making layer to avoid the occurrence of hidden failures or limit the loss of failures to a minimum. It is an urgent problem to be solved in this field.
发明内容 Contents of the invention
本发明所要解决的技术问题是提供一种电网监控与预警系统,通过使用CPU对电网运行参数和故障模型参数进行比较来评价电网运行状态,并将比较结果通过通信模块传输给远程网络控制器,运行管理者通过终端机对运行参数进行监控,并在设定状态下报警,能够预判故障类型和故障线路,改善电网运行安全性和稳定性。 The technical problem to be solved by the present invention is to provide a power grid monitoring and early warning system, which evaluates the power grid operating status by using the CPU to compare the power grid operating parameters and fault model parameters, and transmits the comparison results to the remote network controller through the communication module, The operation manager monitors the operating parameters through the terminal and alarms in the set state, which can predict the type of fault and the fault line, and improve the safety and stability of the power grid operation.
为解决上述技术问题,本发明所采取的技术方案是:一种电网监控与预警系统,包括CPU、系统保护控制器、电网信息采集模块、电流电压检测模块、报警系统、远程网络控制器和终端机,所述系统保护控制器与CPU连接,所述电网信息采集模块和电流电压检测模块与CPU连接,所述CPU信号输出端连接报警系统,CPU通信端连接远程网络控制器,所述远程网络控制器配套设置数据共享模块。 In order to solve the above technical problems, the technical solution adopted by the present invention is: a power grid monitoring and early warning system, including a CPU, a system protection controller, a power grid information acquisition module, a current and voltage detection module, an alarm system, a remote network controller and a terminal machine, the system protection controller is connected to the CPU, the grid information collection module and the current and voltage detection module are connected to the CPU, the CPU signal output terminal is connected to the alarm system, the CPU communication terminal is connected to the remote network controller, and the remote network The controller is equipped with a data sharing module.
所述CPU包括电力系统信息处理模块、故障模型模块、信息分析模块和通信模块,所述电网信息采集模块和电流电压检测模块信号端与电力系统信息处理模块连接,所述故障模型模块与电力系统信息处理模块连接,所述电力系统信息处理模块信号输出端连接信息分析模块,信息分析模块与通信模块连接。 The CPU includes a power system information processing module, a fault model module, an information analysis module and a communication module, the power grid information collection module and the current and voltage detection module signal terminals are connected to the power system information processing module, and the fault model module is connected to the power system The information processing module is connected, the signal output end of the power system information processing module is connected to the information analysis module, and the information analysis module is connected to the communication module.
所述电流电压检测模块包括隔离互感检测电路、抗混叠滤波电路和信号为CS5460A的A/D转换芯片,A/D转换芯片对经过隔离互感检测电路和抗混叠滤波电路预处理的电压电流瞬时值、有效值、功率和电能值进行测量。 The current and voltage detection module includes an isolated mutual inductance detection circuit, an anti-aliasing filter circuit and an A/D conversion chip whose signal is CS5460A. Instantaneous value, effective value, power and energy value are measured.
采用上述技术方案所产生的有益效果在于:本发明针对电力系统状态监控、电网故障与停电隐患事故的预测,利用远程监控技术、电网故障模式识别、高速系统诊断技术与断网检测评估系统构筑了电网监控与预警系统,根据电力系统瞬间状态变化对电网进行实时动态监测与预测评估,并利用电网预警系统及高速网络通信技术进行信息高速传输、决策、报警与系统保护操作,有效改善电网运行稳定性和安全性。 The beneficial effects produced by adopting the above-mentioned technical scheme are: the present invention aims at the state monitoring of the power system, the prediction of power grid faults and hidden danger accidents of power outages, and utilizes remote monitoring technology, power grid fault pattern recognition, high-speed system diagnosis technology and network disconnection detection and evaluation system to construct The power grid monitoring and early warning system, based on the instantaneous status changes of the power system, conducts real-time dynamic monitoring and prediction evaluation of the power grid, and uses the power grid early warning system and high-speed network communication technology to perform high-speed information transmission, decision-making, alarm and system protection operations, effectively improving the stability of power grid operation sex and safety.
附图说明 Description of drawings
图1是本发明原理框图; Fig. 1 is a schematic block diagram of the present invention;
图2是本发明故障模型模块原理图。 Fig. 2 is a schematic diagram of the fault model module of the present invention.
具体实施方式 Detailed ways
下面结合附图和具体实施方式对本发明作进一步详细的说明。 The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
为了解决现有电网监控也预警不到位,容易因局部故障引起整个电网停运的问题,本发明提供一种电网监控与预警系统,包括CPU、系统保护控制器、电网信息采集模块、电流电压检测模块、报警系统、远程网络控制器和终端机,所述系统保护控制器与CPU连接,所述电网信息采集模块和电流电压检测模块与CPU连接,所述CPU信号输出端连接报警系统,CPU通信端连接远程网络控制器,所述远程网络控制器配套设置数据共享模块;:所述CPU包括电力系统信息处理模块、故障模型模块、信息分析模块和通信模块,所述电网信息采集模块和电流电压检测模块信号端与电力系统信息处理模块连接,所述故障模型模块与电力系统信息处理模块连接,所述电力系统信息处理模块信号输出端连接信息分析模块,信息分析模块与通信模块连接;所述电流电压检测模块包括隔离互感检测电路、抗混叠滤波电路和信号为CS5460A的A/D转换芯片,A/D转换芯片对经过隔离互感检测电路和抗混叠滤波电路预处理的电压电流瞬时值、有效值、功率和电能值进行测量。 In order to solve the problem that the existing power grid monitoring is not in place and the entire power grid is likely to be out of service due to local faults, the present invention provides a power grid monitoring and early warning system, including a CPU, a system protection controller, a power grid information collection module, and a current and voltage detection system. module, an alarm system, a remote network controller and a terminal machine, the system protection controller is connected to the CPU, the grid information collection module and the current and voltage detection module are connected to the CPU, the signal output terminal of the CPU is connected to the alarm system, and the CPU communicates The remote network controller is connected to the remote network controller, and the remote network controller is equipped with a data sharing module; the CPU includes a power system information processing module, a fault model module, an information analysis module and a communication module, and the power grid information collection module and current and voltage The signal terminal of the detection module is connected to the power system information processing module, the fault model module is connected to the power system information processing module, the signal output terminal of the power system information processing module is connected to the information analysis module, and the information analysis module is connected to the communication module; The current and voltage detection module includes an isolated mutual inductance detection circuit, an anti-aliasing filter circuit and an A/D conversion chip whose signal is CS5460A. , RMS, power and energy values for measurement.
本发明采用电网故障分析方法对电网故障进行预测,通过对电网系统信号的采集分析,计算出隐患故障发展过程和系统承受力,预测隐患故障的爆发,采取最有的决策避免事故的发生,系统故障模型法的基本思想是:首先对系统的各种故障建立系列故障状态模型,将检测出的系统电流电压及电网状态与故障模型进行比较运算,从而进行电力系统故障识别与状态预测,其原理如图2所示。 The present invention adopts the grid fault analysis method to predict grid faults. Through the collection and analysis of grid system signals, the development process of hidden faults and the bearing capacity of the system are calculated, the outbreak of hidden faults is predicted, and the most effective decision is taken to avoid the occurrence of accidents. The system The basic idea of the fault model method is: first establish a series of fault state models for various faults in the system, and compare and calculate the detected system current and voltage and grid state with the fault model, so as to carry out fault identification and state prediction of the power system. as shown in picture 2.
电力系统状态检测的主要目的是对电力系统运行状态进行测量、分析、评估和预测,为控制执行设备实现预定操作及系统检修提供参考依据,因此电力系统状态检测主要进行的是电力故障类型识别与系统故障发展量度的评估。 The main purpose of power system status detection is to measure, analyze, evaluate and predict the operating status of the power system, and to provide references for the control and execution equipment to achieve scheduled operations and system maintenance. Evaluation of system failure development metrics.
实际电力系统故障多为短路故障,其对电力系统的危害也最大,线间短路故障约占总故障的80%以上,因此,电力系统故障判别的重点是对短路故障类型及故障点进行判断,故障模型参见附图2。 The actual power system faults are mostly short-circuit faults, which are the most harmful to the power system. The short-circuit faults between lines account for more than 80% of the total faults. See Figure 2 for the failure model.
本发明在运行过程中,电力系统三项电压电流信号经过隔离互感检测电路、抗混叠滤波电路等预处理电路后进入专用信号检测A/D转换芯片,转换芯片型号为CS5460A,其内部包含两个模数转换器,能对系统电压电流瞬时值、有效值、功率和电能进行测量,以供系统查询,系统定时对电网运行状态进行检测和分析,利用DSP对电网电压电流瞬时值进行检测和FFT分析计算,从而得到电网各种谐波参数和运行状态参数,并施行故障状态的报警与保护操作,实现电网智能监控与预警功能。 During the operation of the present invention, the three voltage and current signals of the power system enter the special signal detection A/D conversion chip after passing through the isolation mutual inductance detection circuit, anti-aliasing filter circuit and other preprocessing circuits. The conversion chip model is CS5460A, which contains two An analog-to-digital converter can measure the instantaneous value, effective value, power and electric energy of the system voltage and current for system query. The system regularly detects and analyzes the operating status of the power grid, and uses DSP to detect and analyze the instantaneous value of the voltage and current of the power grid. FFT analysis and calculation, so as to obtain various harmonic parameters and operating state parameters of the power grid, and implement alarm and protection operations in fault states, and realize intelligent monitoring and early warning functions of the power grid.
总之,本发明针对电力系统状态监控、电网故障与停电隐患事故的预测,利用远程监控技术、电网故障模式识别、高速系统诊断技术与断网检测评估系统构筑了电网监控与预警系统,根据电力系统瞬间状态变化对电网进行实时动态监测与预测评估,并利用电网预警系统及高速网络通信技术进行信息高速传输、决策、报警与系统保护操作,有效改善电网运行稳定性和安全性。 In a word, the present invention aims at the state monitoring of power system, the prediction of power grid faults and hidden danger accidents of power outages, and constructs a power grid monitoring and early warning system by using remote monitoring technology, power grid fault pattern recognition, high-speed system Real-time dynamic monitoring and predictive evaluation of the power grid for instantaneous state changes, and high-speed information transmission, decision-making, alarm and system protection operations using the power grid early warning system and high-speed network communication technology, effectively improving the stability and security of power grid operation.
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Application publication date: 20150923 |