Optimizing control and capacity planning system and method for involving energy storage device into machine set frequency modulation

Abstract

The invention discloses an optimizing control and capacity planning system and method for involving an energy storage device into machine set frequency modulation. The method comprises the steps that after being connected with a power conversion device and a wave filtering device in sequence, an energy storage unit gets access to a regional power grid, and a logic judgment device is connected with a device for sending an AGC instruction of a dispatching center of the grid, an outlet of a traditional machine set and the power conversion device; the AGC instruction of the dispatching center of the grid is transmitted to the energy storage device and the traditional machine set simultaneously, and the logic judgment device collects the AGC instruction, the outlet power of a power generator and battery electrical charge state information of the energy storage device and judges the outlet power of the energy storage unit at each moment. The optimizing control and capacity planning system and method for involving the energy storage device into the machine set frequency modulation have the advantages that the energy storage device in introduced into the power generation side, the frequency modulation effect can be improved, and the problems that in a traditional frequency modulation mode, the response speed is low, the modulation precision is low, and machine set 'back-modulation' and dead zone vibration exist, can be effective inhibited.

Description

technical field [0001] The invention relates to the technical field of energy storage devices participating in frequency regulation, and in particular to an optimized control strategy and capacity planning system and method for energy storage devices participating in unit AGC frequency regulation. Background technique [0002] With the continuous expansion of the grid scale, the inherent defects of the traditional frequency regulation method are gradually highlighted: slow response and low ramp rate can no longer track Automatic Generation Control (AGC) commands well; in addition, a large number of renewable energy sources are connected to the grid The intermittency and volatility of the operation also aggravate the frequency fluctuation of the power grid, which seriously affects the safe and stable operation of the power grid. Therefore, seeking a new frequency regulation method to solve the frequency stability problems caused by the insufficient frequency regulation capaci...

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Problems solved by technology

[0006] The research objects of the above studies are mainly aimed at the regional power grid. According to the calculation of the regional control deviation, the regional frequency regulation demand is determined, and then the charging and discharging strategy of the energy storage device is determined. From the perspective of the electricity side, the control strategy of the energy storage device and the traditional unit participating in AGC has not been studied.

Moreover, in actual operation, the energy storage device completely replaces the traditional frequency modulation unit for frequency modulation, and its economy is also open to question

[0007] At the same time, considering the performance characteristics of the current energy storage medium: the power-type energy storage device has high instantaneous power, no overcharge and over-discharge restrictions, and no limit on the number of charge and discharge times, but the unit cost is high and the energy capacity is small; Low unit cost and large capacity, but the instantaneous power is small, and there are limitations on overshoot and overdischarge and charge and discharge times

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