An energy storage device system for primary frequency modulation and AGC auxiliary regulation technology

Abstract

An energy storage device system for a primary frequency modulation and automatic generation control (AGC) auxiliary regulation technology comprises a power generation set, a transformer, a power grid, a DC-AC converter and energy storage battery packs and is characterized in that a multi-port DC-DC converter is also arranged, so that connection ports of a plurality of energy storage battery packs are connected with respective port of the DC-DC converter, and at least one supercapacitor is also connected with the respective port of the DC-DC converter; and moreover, a load allocation system is used for receiving a dispatched AGC instruction or forming a load instruction according to a frequency of the power grid, the instruction is divided into two paths, one path passes through an energy management system to be connected with the multi-port DC-DC converter and the DC-AC converter, and the other path is connected with a distributed control system (DCS) and digital electric hydraulic (DEH) control system of the generation set to control the power generation set to work. Therefore, the peak load regulation capability of a power system can be improved, the primary frequency regulation ability and the AGC response capability of a coal-fired unit are improved, the stable running of a power plant is ensured, and energy is saved.

Description

technical field [0001] The present invention relates to electric energy storage and conversion technology, in particular to energy storage technology devices in power systems, which are used for peak load reduction, primary frequency regulation, AGC (automatic generation control) auxiliary regulation, improvement of power grid stability, improvement of power quality, improvement of The role of grid utilization. Background technique [0002] With the development of social and economic forms, the power structure of the power grid has also undergone certain changes: on the one hand, UHV input power has increased steadily, and at the same time, the peak-to-valley difference of the daily load curve of the power grid is increasing day by day, coupled with the adjustment of the domestic national economic structure. The utilization hours of some thermal power units will drop significantly. Therefore, the power grid puts forward new requirements for the generating set: 1) The genera...

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Problems solved by technology

[0007] image 3 Only one group of batteries is used in the battery, which has the following disadvantages: 1) It is difficult for the battery to complete the entire process of charging and discharging cycles, and it is impossible to complete the charging to the rated power and then release it to the best low power of the battery; 2) There is no redundant backup, so it cannot be On-line maintenance, the energy storage technology cannot be used in the event of a failure of the battery pack or DC-AC converter

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