Working state control method and system for energy storing device, and control decision-making device

Abstract

The embodiment of the invention provides a working state control method and system for an energy storing device, and a control decision-making device. The method comprises the steps of determining each node voltage of a power distribution network; determining that the energy storage device needs to be charged and determining a charging proportion if the maximum node voltage exceeds a first percentage of a set standard voltage; outputting a first instruction, thereby instructing a control performing device to control the energy storing device to be charged according to the charging proportion; and enabling the maximum node voltage not to exceed the first percentage of the set standard voltage. According to the method, the system and the device provided by the embodiment of the invention, the voltage limit exceeding risk of the power distribution network is reduced; and in the working state control process of the energy storing device, the control precision is high, the data processing quantity is low and the mode is simple and convenient.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for controlling the working state of an energy storage device, a control decision-making device and a system. Background technique [0002] With the development of solar energy utilization, the application of distributed photovoltaic power generation systems is becoming more and more popular. Distributed photovoltaic power generation systems refer to distributed power generation systems that use photovoltaic modules to convert solar energy into electrical energy; distributed photovoltaic power generation systems follow local conditions, clean and efficient , decentralized layout, and the principle of nearby utilization, generally need to be connected to the distribution network and provide power together with the distribution network. [0003] After the distributed photovoltaic power generation system is connected to the distribution network, the voltage distribu...

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Problems solved by technology

[0003] After the distributed photovoltaic power generation system is connected to the distribution network, the voltage distribution of the distribution network may change, making the line voltage adjustment control of the distribution network complicated; specifically, the traditional voltage regulation (adjustment voltage) of the distribution network The principle is to consider the one-way flow of the power flow from the high-voltage side to the low-voltage side, and usually maintain the bus voltage within a relatively high range (such as 103% to 105% of the rated voltage), thereby ensuring that the voltage on the distribution network line is not lower than The lower limit value of the rating, the power flow refers to the steady-state distribution of the voltage of each node and the power (active power and reactive power) of each branch in the power system; and with the increase of distributed photovoltaic power generation systems connected to the distribution network, the power flow reverses. When in the direction of the feeder, the voltage drop caused by the impedance of the feeder will make the voltage on the load side higher than the bus voltage, and the problem of voltage exceeding the limit may occur

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