Grid-connected point voltage control method and system of movable optical storage system

Abstract

The invention discloses a grid-connected point voltage control method and system for a movable optical storage system. The method comprises the following steps: acquiring the voltage of a grid-connected point at the current moment and the voltage of an access point of the movable optical storage system; when the grid-connected point voltage enters a set compensation interval, determining an apparent power output value of the optical storage system at the next moment based on the voltage of the grid-connected point at the current moment and the voltage of an access point of the optical storagesystem; and determining a control strategy for the optical storage system and the output power of the optical storage system under the control strategy based on the relationship between the apparent power output value and the maximum capacity of the optical storage system. According to the invention, the output power of the optical storage system can be continuously adjusted according to the voltage deviation of the grid-connected point, the power output capability of the optical storage system and the apparent power output value of the optical storage system at the next moment when the grid-connected point enters the set compensation interval, the active support of the grid-connected point voltage is realized, and the power supply quality of the tail end of the power distribution networkis improved.

Description

technical field [0001] The invention relates to the field of grid-connection of distributed power sources, in particular to a method and system for controlling the voltage of a grid-connection point of a movable optical storage system. Background technique [0002] Vigorously developing renewable energy such as wind energy and solar energy is an important strategic measure to adjust the energy structure in the region and achieve energy conservation and emission reduction. With the increasing proportion of distributed new energy installed capacity, not only the network structure of the power system has been changed, but also the impact of its own volatility on the power grid has become more and more obvious, especially in areas with high penetration rates of wind power and photovoltaics. The frame structure is weak, and problems such as voltage fluctuations often occur. At the same time, the types of electric loads continue to increase, and some areas show obvious seasonal a...

AI Technical Summary

Problems solved by technology

At the same time, the types of electric loads continue to increase, and some areas show obvious seasonal and time-period characteristics, resulting in low terminal voltage and poor power factor

Voltage fluctuation not only affects the safe and stable operation of the large power grid, but also seriously affects the quality of energy consumption of users

At present, the main method to improve the voltage stability at the end of the distribution network and reduce the voltage deviation is to use a reactive power compensation device or a static synchronous compensator to solve the problem of power quality at the grid-connected point. The delay is large, it is difficult to meet the requirements of real-time control

In addition, when the voltage fluctuates greatly, it will lead to frequent cut-in and cut-out of the compensation device, which will affect the life of the equipment and the stability of the system. At the same time, adding reactive power compensation devices will also increase the construction cost of the project.

At present, according to the three different application requirements of smoothing power fluctuations, tracking planned output and grid frequency regulation, a coordinated control strategy of wind and storage, considering the state of charge of energy storage, has been proposed, but this control strategy does not solve the problem of voltage fluctuation and power factor at the grid-connected point. Program

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