Electricity generation power instruction feed-forward control method of thermal power generating unit coordination control system

Abstract

The invention relates to an electricity generation power instruction feed-forward control method of a thermal power generating unit coordination control system. The electricity generation power instruction feed-forward control logic includes the step that automatic generation control (AGC) instructions are divided into two paths after passing through a change amplitude limiting link, wherein one path of AGC instructions is subjected to a change rate limiting link so that actual electricity generation power instructions can be generated, and the other path of AGC instructions is subjected to a linear filtering link, a change rate limiting link and a leading link, so that electricity generation power instruction feed-forward output can be obtained. According to the electricity generation power instruction feed-forward control system of the thermal power generating unit coordination control system of the invention, the boiler of a thermal power generating unit is reasonably utilized to store heat, so that a contradiction between the improvement of AGC instruction response rate and the reduction of boiler fuel quantity fluctuation under a power regulation dispatching mode (R dispatching mode) can be alleviated; the stability of steam pressure of a steam turbine can be ensured when the AGC instructions change greatly in a unidirectional manner, and boiler fuel quantity drastic fluctuation when the AGC instructions change slightly and frequently can be avoided. Compared with a traditional feed-forward control scheme, the electricity generation power instruction feed-forward control method of the invention has the advantages of clear physical meaning of set parameters, convenient configuration and debugging process and the like.

Description

technical field [0001] The invention relates to a power generation command feedforward control method suitable for a thermal power unit coordinated control system adopting a power regulation dispatch mode (R dispatch mode for short), and belongs to the technical field of power generation. Background technique [0002] Electric energy is difficult to store directly, and the power grid needs to dispatch the generated power of each generator set in the network to make it equal to the power consumption at all times. The grid frequency is a technical indicator that reflects the balance between the power generation and the power consumption. Therefore, the process of adjusting the generated power of the generator sets in the grid dispatching network is also called frequency regulation. Frequency regulation is divided into primary frequency regulation and secondary frequency regulation. Primary frequency regulation means that the generator set directly changes its own power generat...

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Problems solved by technology

Fluctuation of fuel volume command will lead to boiler combustion fluctuations, which in turn will cause primary air pressure, secondary air pressure, oxygen content, furnace pressure, superheated steam temperature, reheated steam temperature, drum water level of drum boiler or intermediate point temperature of once-through boiler, NO X The fluctuation of a series of main parameters such as emission concentration will have adverse effects on the safety, economy and environmental protection of the unit, and the fluctuation of these parameters will eventually affect the stability of the main steam pressure

When the key parameters of the unit are unstable, its generating power control index will inevitably drop

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