Control protection method and system for power distribution network series capacitor compensation device

Abstract

The invention provides a control protection method and system for a power distribution network series capacitor compensation device. The control protection method comprises the following steps of acquiring the physical quantity of the capacitor compensation device; enabling the obtained physical quantity to be substituted into a pre-established fast switch control model, and realizing the controlprotection of the power distribution network series capacitor compensation device; and enabling the fast switch control model to adopt a voltage and power flow automatic switching, capacitor protection or rapid fault identification method for controlling the separation or closing of the fast switch of the power distribution network series capacitor compensation device. According to the control method and system, the risk of overvoltage and magnet resonance is eliminated, and the protection of the internal fault of the capacitor and the rapid fault protection of the power distribution network series capacitor are realized.

Description

[0001] Technical field: [0002] The invention belongs to the field of low-voltage control of distribution networks, and in particular relates to a control and protection method and system for a series capacitor compensation device of a distribution network. [0003] Background technique: [0004] In recent years, with the increase of user demand for electricity and the diversification of load structure, some 10kV distribution lines have experienced the problem of terminal voltage reduction due to geographical location, technical factors and timeliness of management, which directly leads to the deviation of power factor of 10kV lines. Low voltage, increased voltage drop, increased power loss, reduced service life of power distribution equipment, and increased grid security risks. It has seriously affected the production and quality of life of users, and brought certain negative effects to enterprises. Utilize the concentrated capacitive impedance formed by the capacitor banks ...

AI Technical Summary

Problems solved by technology

At present, although manufacturers who can design and manufacture distribution network series capacitor compensation devices are gradually increasing, due to the lack of independent research and development capabilities of control and protection strategies and devices, manufacturers do not understand the application occasions and working characteristics of the devices, so there is no suitable distribution network series capacitor compensation device. Control and protection strategies for capacitor compensation devices, especially the unique series capacitor automatic switching strategy, series capacitor protection strategy and system short-circuit fault fast protection

At present, most distribution network series capacitor compensation devices are only manually operated, with simple voltage and current protection functions, and there is no protection against the failure of the capacitor itself. In the case of excessive system voltage at night, ferromagnetic resonance even occurs and the line trips. Therefore, the control and protection strategy of the distribution network series capacitor compensation device suitable for distribution network low voltage management has become a major problem for many distribution network series capacitor compensation device manufacturers, and has also become a problem that restricts the distribution network series capacitor compensation device. A barrier to further enhance the compensation effect of the compensation device

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