CN104931836A - Power grid monitoring and early warning system - Google Patents

Abstract

The invention discloses a power grid monitoring and early warning system. The system includes a CPU, a system protection controller, a power grid information collection module, a current and voltage detection module, an alarming system, a remote network controller, and a terminal. The system protection controller is connected to the CPU. The power grid information collection module and the current and voltage detection module are connected to the CPU. The signal output end of the CPU is connected to the alarming system. The communication end of the CPU is connected to the remote network controller. The remote network controller is equipped with a data sharing module in a mating manner. For state monitoring of an electric power system, faults of a power grid and predictions of power failure hidden trouble accidents, the power grid monitoring and early warning system is established through a remote monitoring technology, power grid fault mode identification, a high-speed system diagnosis technology and a network-disconnection detection and evaluation system to dynamically monitor, predict and evaluate the power grid in real time according to instant state changes of the electric power system. Moreover, information high-speed transmission, decision, alarming and system protection operations are carried out by utilizing a power grid early warning system and a high-speed network communication technology.

Description

Power grid monitoring and early warning system

technical field

The invention relates to the technical field of power grid monitoring, in particular to a power grid monitoring and early warning system.

Background technique

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.

Contents of the invention

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.

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.

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.

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.

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.

Description of drawings

Fig. 1 is a schematic block diagram of the present invention;

Fig. 2 is a schematic diagram of the fault model module of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

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.

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.

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.

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.

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.

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.

Claims (3)

1. A power grid monitoring and early warning system, characterized in that: comprise CPU, system protection controller, power grid information acquisition module, current and voltage detection module, alarm system, remote network controller and terminal machine, described system protection controller and The CPU is connected, the power 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 a remote network controller, and the remote network controller is equipped with a data sharing module. 2. The power grid monitoring and early warning system according to claim 1, characterized in that: 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 detection The module signal terminal 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. 3. The power grid monitoring and early warning system according to claim 2, characterized in that: 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, and the A/D The conversion chip measures the voltage and current instantaneous value, effective value, power and electric energy value preprocessed by the isolated mutual inductance detection circuit and the anti-aliasing filter circuit.