A Control Method for Hybrid Energy Storage System Oriented to Optimal Operation of Distribution Network

Abstract

The invention discloses a hybrid energy storage system control method for optimization running of a power distribution network. The hybrid energy storage system control method comprises the steps of building a flexible grid-connected model of a photovoltaic hybrid energy storage system; building a model, participating in optimization running of the power distribution network, of the photovoltaic hybrid energy storage system according to source-network economic running of the power distribution network and a node voltage optimization target, and acquiring a hybrid energy storage optimal targetpower; and proposing a hybrid energy storage control strategy according to a charge state and a charge-discharge state, and reasonably allocating charge-discharge powers of a storage battery and a supercapacitor. By the hybrid energy storage system control method, economic running of the power distribution network and out-of-limit treatment of a node voltage can be effectively achieved, moreover,the technical characteristics of different energy storage mediums can be fully developed, and the running lifetime of the hybrid energy storage system is prolonged.

Description

technical field [0001] The invention relates to a control method for a hybrid energy storage system oriented to optimal operation of a distribution network, and belongs to the technical field of energy storage equipment operation control. Background technique [0002] Under the dual pressure of energy and the environment, clean energy power generation represented by photovoltaics has achieved unprecedented development. However, the high-penetration distributed photovoltaic grid-connected easily causes problems such as the voltage limit of the distribution network, which affects the full consumption of photovoltaic energy. In addition, with the increasing use of cables in urban distribution networks in my country, the line impedance ratio R / X is relatively large, and the voltage is more sensitive to changes in active power. Both active and reactive power flows will have a greater impact on node voltage, further aggravating Solved the high voltage problem of photovoltaic high ...

AI Technical Summary

Problems solved by technology

Compared with the main network, the power flow control means of the distribution network are weak, and the relative value of distributed photovoltaic output fluctuations is relatively small, and the demand for solving the node voltage limit caused by high-penetration photovoltaics and improving the economic operation level of the distribution network is more prominent

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