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Analysis on Control of Automatic Reactive Compensation Device for Low-voltage Substation

Last updated: February 25,2020   Click: 84   By: Siemens apt

  With the continuous improvement of China's economic level, the rapid development of China's power industry has been promoted. People have higher requirements for the quality of power supply, and it is necessary to automate the power system. The automatic reactive power compensation technology provides a safe and reliable technical guarantee for the operation, management, and control of low-voltage substation automatic reactive power compensation technology after integrating various technologies. It is very important to realize the automatic control of power systems. effect. Therefore, this paper makes a detailed analysis of the control of the low-voltage substation automatic reactive power compensation device.

  The reactive power compensation device is a widely adopted measure in various electric power plants and high-rise building transformer substations. Most electric power companies use manual methods to switch capacitors, even when they are not used for a long time. In addition, if the load fluctuates, fixed compensation may cause over-compensation or reverse reactive power, which will increase losses and bring losses to the power grid. Therefore, the power supply bureau should install an inverting device for the reactive power in the substation of the factory and enterprise. Realizing the automation of power system dispatching, control, and management is of great significance to simplify the work of operation and management staff, realize the intelligence of operation control management, reduce energy consumption, improve the safety and stability of power system operations, and facilitate operation and maintenance.

  I. Characteristics of low-voltage distribution automation

  Low-voltage distribution automation has the characteristics of integration, intelligence, computerization and screen.

  1. Integration

  Integration refers to the integration of low-voltage distribution automation functions. The automation of low-voltage substations is formed by the fusion of many different technologies. It has the functions of conventional secondary equipment inside the system. The advanced microcomputer protection device now replaces the conventional relays in the past. The microcomputerized monitoring device includes instrument screens, analog screens, operation screens and other devices. It has the functions of reactive power compensation, light nameplate, on-load voltage regulation and central signal system . If the microcomputer protection and monitoring device is interfaced, it can perform fault recording, ranging and signal ground alarm.

  2. Intelligent

  Intelligent refers to the intelligent management of the operation and management of low-voltage distribution devices. The integrated automation system must not only have the conventional functions of the substation, but also have the function of online automatic diagnosis, and perform real-time monitoring of its integrity. Among them, the functions of the integrated automation system mainly include automatic report forms, automatic alarms, discrimination and handling of accidents, and automatic adjustment of voltage and reactive power.

  3. Computerization

  Computerization refers to the computerization of the low-voltage transformer distribution structure. In general, the substation integrated automation system mainly uses the CPU distribution structure. The main plug-ins, components, and functional modules are all computerized. It uses division of labor and cooperation to connect network buses to form an organic whole.