Composite energy storage power supply system for peak regulation and frequency modulation of power grid and regulation and control method thereof

Abstract

The invention provides a composite energy storage power supply system for peak regulation and frequency modulation of a power grid. The system comprises a renewable energy power generation device; a battery energy storage device, wherein a first input end of the battery energy storage device is connected with a power supply output end of the renewable energy power generation device through a DC / DC converter; a first DC / AC converter, wherein the power supply output end of the battery energy storage device is connected with the common alternating current bus through the first DC / AC converter; a second DC / AC converter, wherein the power supply output end of the renewable energy power generation device is connected with the common alternating current bus through the second DC / AC converter; a solar thermal power generation device, wherein the power supply output end of the solar thermal power generation device is connected with the public alternating current bus through an AC / AC converter; and a heat storage device which is connected with the solar thermal power generation device, wherein heat storage and heat release can be carried out between the heat storage device and the solar thermal power generation device. The composite energy storage power supply system provided by the invention can give consideration to stability, reliability, economy and environmental protection when being used for peak regulation and frequency modulation of a power grid.

Description

technical field [0001] The invention relates to the field of renewable energy power generation, in particular to a composite energy storage power supply system for power grid peak regulation and frequency regulation and a control method thereof. Background technique [0002] Renewable energy generation such as wind power and photovoltaics has the characteristics of volatility, randomness, and non-schedulability, which have caused a certain impact on the safe and stable operation of the power grid. The phenomenon of wind and solar abandonment has become increasingly prominent, seriously affecting economic benefits. At present, using traditional thermal power units for peak regulation and frequency regulation can stabilize the fluctuation to a certain extent, but as the proportion of thermal power gradually decreases and the installed capacity of renewable energy continues to increase, only using thermal power units will not be able to meet the peak regulation and frequency reg...

AI Technical Summary

Problems solved by technology

The peak-shaving and frequency-regulating system disclosed in this Chinese patent document uses pumped storage, which has high requirements for the selected address environment, high cost, low security, and poor stability

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