A real-time online comprehensive compensation device and method for distribution network voltage sag

Abstract

The invention discloses a real-time online comprehensive compensation device for voltage sag of a distribution network and a method thereof. Through arranging a device on a high voltage side or a lowvoltage side of a distribution transformer, voltage is dynamically adjusted and output. The device can solve problems of voltage sag and power quality exist commonly in a distribution network, and effectively guarantees reliability of sensitive load power consumption. The device solves problems that a traditional voltage sag compensation device has insufficient compensation depth and difficult maintenance, and can reduce energy consumption, save installation space and reduce equipment operation cost, and has good economic benefits.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to a real-time on-line comprehensive compensation device for voltage sags in a distribution network and a method thereof. Background technique [0002] Voltage sag is the most common power quality problem in the industrial field. It refers to the phenomenon that the effective value of voltage drops suddenly and then recovers quickly. Voltage sags are mostly accidental emergencies with a high frequency, and the cause of the accident is not easy to find out. The depth of voltage sags is mostly within 30%, and the duration is less than 1 second. With the improvement of factory automation and the extensive use of new sensitive loads, equipment shut down due to power supply voltage disturbances, resulting in serious downtime and production losses. [0003] Traditional voltage sag control equipment on the market mainly adopts two methods, real-time online series compensation method a...

AI Technical Summary

Problems solved by technology

The real-time online series compensation method is used to compensate the voltage, no energy storage device is required, the energy consumption is extremely low, and the cost is also low. It can cope with the working conditions of frequent and slight voltage drops. However, in the case of deep voltage drops or short-term interruptions, the equipment Failure to meet compensation requirements

The off-line parallel inverter compensation method includes energy storage devices. Through the inverter voltage method, a wide range of deep compensation can be achieved, but limited by its energy storage capacity, it is not suitable for frequent voltage drops, and it needs to face high energy consumption and maintenance. Cost, high investment cost, difficult promotion

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