Active power control method for flexible distribution network power supply system

Abstract

The invention discloses a method for controlling active power of a flexible distribution network power supply system. The flexible distribution network power supply system is provided with n flexible converters, n distribution transformers, n sections of AC bus and one DC bus, each flexible Both ends of the converter are connected to the DC bus and one end of the corresponding AC bus respectively, and the other end of the AC bus is connected to the corresponding distribution transformer, n is an integer and n≥2; any flexible converter operates in the DC bus voltage control mode, Other flexible converters operate in active and reactive power control mode. When any AC bus is overloaded, the coordinated control unit controls one or more flexible converters to implement active power support for the overloaded AC bus and prevent the distribution transformer from being overloaded. This method can monitor the load of each busbar in real time, obtain the power command of the flexible converter through traditional proportional and integral control, automatically and flexibly coordinate the power flow between each busbar, and prevent the distribution transformer from overloading; the control scheme is simple and easy to implement in engineering.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current power distribution, in particular to a method for controlling active power of a flexible distribution network power supply system. Background technique [0002] In recent years, in the field of low-voltage distribution network power supply systems, with the continuous increase of distributed power sources, the continuous increase of electric vehicles and the increase of controllable loads, the traditional distribution network faces many challenges. Due to the capacity limitation of the power supply system of the traditional distribution network, with the increase of short-term high-power impact loads such as charging piles or chargers, it is easy to cause overload of the distribution transformer, and even cause the power supply system to fail. In order to solve these problems, the traditional power grid has gradually shifted from passive mode to active mode, in which the use of fle...

AI Technical Summary

Problems solved by technology

When a section of the bus is overloaded, the power command of the flexible converter of other buses can be manually adjusted to transfer power to the overloaded bus, but there is no guarantee that the bus of this section will not be overloaded after the power is transferred.

At the same time, this manual adjustment method cannot achieve real-time and rapid adjustment, and cannot give full play to the advantages of the flexible distribution network power supply system

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