DC bus voltage stability control method and control system for optical storage system

Abstract

The invention relates to a DC bus voltage stability control method and a control system for an optical storage system. The DC bus voltage stability control method comprises the steps of obtaining thefirst reference current of the energy storage system according to the difference between the grid-connected power on the AC side and the power on the photovoltaic side; adaptively controlling the second reference current of the energy storage system according to the difference between the DC bus reference voltage and the actual voltage of the DC bus; performing PI control on the obtained first reference current, the second reference current, and the actual current of the energy storage system to obtain a corresponding PWM pulse; and controlling the DC / DC converter of the energy storage systemaccording to the PWM pulse. The power difference feedforward control and the voltage difference adaptive control are combined to solve the problem that the existing PI parameters are difficult to adjust, easy to diverge, and initially over-adjusted. Moreover, the method ensures that the energy storage system reacts faster and more quickly, and accelerates the dynamic response of the system, thereby largely suppressing the fluctuation of the DC bus voltage and making the DC bus voltage stable to the reference voltage.

Description

technical field [0001] The invention relates to a DC bus voltage stabilization control method and control system of an optical storage system, and belongs to the technical field of DC bus voltage control of the optical storage system. Background technique [0002] Distributed power generation technology has attracted widespread attention. A large number of random and intermittent distributed power sources directly connected to the grid will have adverse effects on system stability and power quality. In order to stabilize photovoltaic output power fluctuations and reduce power fluctuations The adverse impact on the power grid can be well solved by the optical-storage coordinated control system. Through the charge and discharge control of the energy storage system, it can absorb "excess energy" or make up for "deficiency energy" to achieve the purpose of power regulation. The DC / DC conversion device on the side of the energy storage system in the optical-storage coordinated co...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a DC bus voltage stabilization control method for an optical storage system to solve the problem that the traditional method cannot reliably stabilize the DC bus voltage

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