| As the structure of hydropower units becomes more and more complex,the degree of automation is getting higher and higher,and the capacity of single units is getting larger and larger.Therefore,higher requirements are put forward for the utilization rate of unit equipment,the operation efficiency of hydraulic turbines,the safety,stability and economy of units.In response to these requirements,this paper focuses on the performance evaluation and operation optimization of hydropower units.Based on the analysis of the comprehensive evaluation of the water unit and the research status of the operation optimization,this paper points out that there are few comprehensive evaluation studies on the unit,and most of the operation optimization is for a single indicator.Therefore,it is of great significance to carry out comprehensive performance evaluation and operation optimization research.Firstly,a series of work has been carried out for the comprehensive evaluation of unit performance.The indicators involved in performance evaluation of hydropower units are classified into safety indicators,stability indicators,and economic indicators according to attributes.According to the relevant regulations,the operation status of the unit is divided into good,qualified,inspected,and required to stop.The conversion process between the four states is analyzed in detail,which provides a basis for the data of each indicator as well as the stability and economic rating.Build a performance evaluation system framework and detail the specific work of each unit.Several commonly used methods for data acquisition of hydropower units are introduced.According to the principles of these methods,the data of each index system needed in this paper are collected by classification.The possible problems of the units when the values of each index exceed the prescribed range are listed in detail.When the flow can not be collected by conventional methods,a flow model is proposed to determine the flow through the turbine in each working condition.The validity of the model is verified by an example.The reference standard of each index required for performance evaluation of hydropower units is introduced,four grades of membership function of each index are divided into fuzzy intervals.A comprehensive performance evaluation method of hydropower units based on fuzzy hierarchy is proposed.The relative weights of each index are calculated according to the analytic hierarchy process with automatic regulation function,and then the comprehensive evaluation results of stability and economy are calculated respectively by the fuzzy comprehensive evaluation method.Then,based on the evaluation results of unit stability and economy,the operation optimization of unit is studied,with the historical data,the operation conditions and operation areas of unit are divided.Under the condition that the unit meets the safe operation,the stable operation optimization algorithm and the economic operation optimization algorithm are introduced.By analyzing the current operating area of the unit,combined with the stable operation optimization algorithm and the economic operation optimization algorithm,the load is adjusted to ensure that the units are all operating in the stable area.In order to verify the validity of the fuzzy hierarchical comprehensive evaluation method and the optimization algorithm,this paper takes four units in operation of a power plant as the specific research object,fuzzy analytic hierarchy process is used to evaluate its stability and economy,the load of the unit is adjusted according to the stable operation optimization algorithm and the economic operation optimization algorithm to ensure that all four units are running in the stable region,to a certain extent,the stability of the unit is better and the economy is relatively higher. |
