Double-layer AGC frequency modulation control method considering operation economic cost and energy storage SOC consistency

Abstract

The invention discloses a double-layer AGC (Automatic Gain Control) frequency modulation control method considering operation economic cost and energy storage SOC (State of Charge) consistency. The method comprises the following steps: (1) constructing a thermal power generating unit frequency modulation operation cost function; (2) constructing an energy storage frequency modulation operation cost function; (3) formulating a secondary frequency modulation control method of the regional control level; (4) formulating an energy storage unit SOC consistency control method of an energy storage station level; (5) formulating an energy storage battery SOC management scheme; (6) constructing a frequency modulation performance evaluation index; and (7) building a unit frequency modulation dynamic model containing the energy storage battery. According to the control method provided by the invention, the influence of different disturbance working conditions on a fire storage AGC frequency modulation responsibility distribution mode is considered, the frequency modulation characteristic of rapid and flexible response of energy storage is fully exerted, and the service life of energy storage and the comprehensive operation efficiency of the system are effectively improved while the frequency modulation operation cost is optimized, the frequency modulation performance is improved and the frequency modulation compensation income is increased.

Description

technical field [0001] The invention relates to an energy storage frequency regulation control method, in particular to a double-layer AGC frequency regulation control method which takes into account the economic cost of operation and the consistency of the energy storage SOC. Background technique [0002] With the increasing scale of new energy power generation, the intermittent, fluctuating and even anti-regulation problems of its power generation are becoming more and more obvious. Conventional thermal power units are generally large in scale and have a slow frequency modulation response speed. Frequent start and stop of the unit will cause energy waste and cause great damage to the unit. The multiple tasks also make it difficult for thermal power units to fully utilize the frequency modulation function. Conventional units are equipped with a certain proportion of the energy storage system, giving full play to the fast and flexible adjustment characteristics of the energy...

AI Technical Summary

Problems solved by technology

Although this method takes into account the characteristics of fast and flexible adjustment of energy storage, using a filter to decompose the signal will cause inaccurate allocation of frequency modulation commands due to the influence of filtered signal amplitude attenuation, phase shift, and distortion, which is not conducive to the improvement of frequency modulation effects

Scholars such as MANOJDATTA proposed a control method for proportional distribution of ACE signals among electric vehicles, photovoltaic power generation systems and energy storage systems. Although this method of static proportional distribution is simple and easy to operate, it does not fully consider the frequency modulation output characteristics of different power sources. It also ignores the influence of different load disturbance conditions on the distribution of frequency modulation commands, and lacks effective management of energy storage SOC

In addition, most of the existing research regards the energy storage system as a single individual participating in the frequency regulation, and there are few studies on the coordinated control of the energy storage units in the energy storage power station, and the differences between the energy storage units during the frequency regulation process (such as SOC difference etc.) will reduce the frequency modulation efficiency, which is not conducive to the safe and stable operation of the system

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