Economic Operation Optimization of Thermal Power Units with Low Load Conditions Considering Frequency Modulation Capability

The peak shaving depth and peak shaving ability of the thermal power unit during peak peaking are not compatible. This paper analyzes the deep peak shaving capacity and economy of China's existing thermal power units based on the large-scale clean energy grid connection. Based on the low cycle fatigue of the thermal power unit rotor, based on the Manson-Coffin formula, a calculation method of the unit life loss cost under variable load peaking is given, and the lowest cost objective function in the deep peak shaving process of the unit is obtained. From the perspective of grid operation, a thermal power unit load optimization allocation model considering the frequency modulation capability is established. As a new optimization algorithm, the sine cosine algorithm (SCA) uses the variation of the value of the sine cosine function to perform global optimization. The calculation amount is small, the convergence effect is good, and the parameters need to be set less. Therefore, the sine cosine algorithm is used to solve the problem.