A method for active power control of hydroelectric units in a single recommended operation area

Abstract

The invention discloses a method for controlling the active power of a hydroelectric unit in a single recommended operation area, and belongs to the technical field of hydroelectric power generation control. Divide the automatic power generation control function into the power station-level AGC module, the unit-level PLC module and the unit-level governor module and then assign tasks, determine the parameters, assignment relationships and dependencies; establish all possible distribution modes and corresponding combinations that include AGC control units The intermediate table of the operation interval determines the optimal unit distribution mode of the units put into AGC control, and calculates the single-unit AGC active power distribution value, and performs the active power control of the hydroelectric unit in the single-recommended operation area. It is suitable for hydropower stations where the intervals are divided into vibration zone 1→restricted operation zone→vibration zone 2→recommended operation zone from low to high. It can quickly calculate the single-unit AGC active power of each unit according to the total active power setting value of the hydropower station. The distribution value and the active power setting value of a single unit can meet the operation requirements of the unit avoiding the vibration area and the restricted operation area at the same time.

Description

technical field [0001] The invention belongs to the technical field of hydroelectric power generation control, and in particular relates to a method for controlling the active power of a hydroelectric unit in a single recommended operation area. Background technique [0002] The control of active power output of hydropower stations generally adopts that the total active power set value of the whole station is distributed to each hydroelectric generating unit (hereinafter referred to as unit) through the automatic generation control function (Automatic Generation Control, referred to as AGC), and then each unit The power adjustment mechanism performs closed-loop adjustment according to the active power distribution value of the single AGC. In the actual application of various hydropower stations for a long time, the automatic power generation control function generally has shortcomings such as rough algorithm, lack of integrity, poor connection of each function block, logic m...

AI Technical Summary

Problems solved by technology

[0006] Through the work of documents 1-7, although the unity of active power control strategies of hydropower stations has been greatly improved, and abnormal problems caused by conflicts between strategies have been basically eliminated, there are still some problems to be solved: 1) There are still some unreasonable strategy and logic, and brought some problems during the operation process, for example: The single-unit active power actual value of the unit whose active power closed-loop adjustment function has not been put into use participates in the AGC distribution calculation, but since the unit active power is always in a state of small changes, Therefore, the AGC function will be frequently redistributed; and the current input of the AGC function of the whole plant is based on the premise of the AGC control of the organic unit. This logic has major flaws in practical applications

2) Document 7, on the basis of Documents 1-6, considers the problem that the unit repeatedly passes through the vibration zone under the condition of frequent secondary frequency regulation, but in the selection of two allocation strategies, it is to give priority to preventing the unit from entering the restricted operation The selection of the two strategies of preventing the unit from crossing the vibration zone or giving priority to preventing the unit from crossing the vibration zone is slightly extreme and mechanical, resulting in some working conditions, especially under the control of the strategy of giving priority to avoiding the unit from crossing the vibration zone, the selection of the distribution mode of the unit is not very clear. ideal

From this point of view, one of the problems of literatures 1-7, especially literatures 1-6, is that their methods are completely designed for the unit types that need to pass through the vibration zone transition from the operating zone to the operating zone (ie, the second type of unit), and it is difficult to Applicable to the third category of hydroelectric units, but at the same time there is no fully customized method design for the characteristics of the second category of hydroelectric units

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