Control method for supercritical unit participating in primary frequency regulation and control system model

Abstract

The invention discloses a control method for a supercritical unit participating in primary frequency regulation and a control system model. The method comprises the following steps: when the supercritical unit operates steadily under a given working condition, an intermediate pressure regulation valve is fully opened, and a high pressure regulation valve is regulated to a preset opening; when loadof the unit is increased, the opening of the high pressure regulation valve is increased, and the opening of the intermediate pressure regulation valve remains unchanged; when reduction of the load results in increasing of a power grid frequency, the opening of the high pressure regulation valve and the opening of the intermediate pressure regulation valve are reduced at the same time, and the high pressure regulation valve and the intermediate pressure regulation valve participate in primary frequency regulation at the same time; and after regulation, the intermediate pressure regulation valve is regulated to be in a full opening state. The high pressure regulation valve and the intermediate pressure regulation valve of a reheat turbine unit can participate in power grid primary frequency regulation at the same time, and the supercritical unit primary frequency regulation ability can be improved.

Description

technical field [0001] The invention belongs to the technical field of primary frequency regulation of a supercritical unit, and in particular relates to a control method and a control system model for a supercritical unit participating in primary frequency regulation. Background technique [0002] Power production puts forward two basic requirements for the regulating system of the steam turbine used for power generation, which is to ensure that the unit can meet the user's requirements for electric energy and ensure the safety of the unit itself. There are two basic operation modes for steam turbines for power generation. One is stand-alone operation. One unit is used to supply power to users. The load corresponds to the power of the unit one by one. The speed adjustment system adopts proportional-integral (PI) adjustment; the other is It is grid-connected operation. At this time, there are two or more units in the grid to supply power to users at the same time. Since the ...

AI Technical Summary

Problems solved by technology

However, with the increase of the capacity of grid-connected operating units and the complexity of grid construction, the impact of grid load changes on grid frequency is increasing. In addition, the introduction of a large number of new intermittent power supplies and the imbalance between heating demand and electric power in winter in northern regions have seriously affected the frequency stability of the power grid.

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