Primary frequency modulation control method for cogeneration unit coupling system

Abstract

The application provides a primary frequency modulation control method of a cogeneration unit coupling system, belongs to the technical field of heat and electricity decoupling regulation and control of cogeneration, and can at least partially solve the problem of large difference in dynamic response characteristics of various devices, lack of unified coordinated control, and easy occurrence of unreasonable power distribution, device overload and frequency modulation power overshoot and the like, and comprises the following steps: receiving a power grid dispatching instruction; determining a power grid frequency deviation based on the power grid dispatching instruction and in combination with adjustable capacity and response characteristic parameters of an electric-thermal conversion device and a cogeneration unit; cooperatively controlling output power of the electric-thermal conversion device and the cogeneration unit based on the power grid frequency deviation; and when the coupling system reaches a preset frequency modulation requirement, the output power of the electric-thermal conversion device is reduced to completely quit, and the cogeneration unit independently bears the frequency modulation power requirement. The application cooperatively distributes power in different frequency modulation stages, realizes cooperative optimization of frequency modulation performance and operation safety, suppresses power overshoot, and improves stability of the frequency modulation process.