多机运行的光伏水泵群控系统研究
[Abstract]:In order to solve the problem of "raising water threshold" in single machine photovoltaic pump system, a group control system of photovoltaic pump with multi-machine parallel operation and its optimal control strategy are put forward. In this paper, the topological structure of the group control system, the characteristics and models of the components of the system, the stability of the array voltage and the optimal control strategy of the system are studied. The main research contents are as follows: (1) the topology of PV pump group control system is summarized and classified, and the common DC busbar is proposed. The structure of field bus and large cascade PV pump group control system is analyzed and compared. In this paper, the field bus photovoltaic pump group control structure is taken as the research object. (2) the various components of the field bus photovoltaic pump group control system are introduced, and the mathematical model and characteristics of the photovoltaic array are analyzed in detail. The static equivalent circuit and dynamic model of asynchronous motor, the basic performance of water pump and the working characteristics of parallel operation of several pumps, It provides a theoretical support for the study of system stability and optimal control strategy. (3) the constant voltage-frequency ratio frequency conversion control and vector frequency conversion control of asynchronous motor are introduced, and the control parameters of vector control are designed. The stability of vector control is verified by theoretical analysis and simulation. In order to solve the problem that the array voltage can not be kept stable when traditional proportional control is used in multi-machine running water pump group control system, two solutions are proposed. First, a proportional control strategy based on secondary voltage compensation is proposed. The stability of array voltage is solved by adding array voltage compensation to the central controller. Second, a master-slave control strategy suitable for photovoltaic pump group control system is proposed. A inverter is selected as the host to complete the stability of array voltage. (4) the optimal control strategy of photovoltaic pump group control system is studied. The maximum power point of photovoltaic array is tracked by a perturbation observation method with constant voltage start-up, the problem of maximum power point migration in group control system is analyzed and three solutions are proposed, and the principle of pump power distribution is studied. It is proved theoretically that the total flow of the system is the largest when the power of multiple pumps is equal. In order to realize the optimal dispatching of parallel pumps, a water pump switching scheme based on frequency decision is proposed. (5) the experimental platform of PV pump group control system under multi-machine operation is built. The function, software design and implementation of the central controller are introduced in detail. The power distribution principle of the pump, the stability of frequency conversion control and vector control of induction motor and the group control strategy of proportional control based on secondary voltage compensation are verified by experiments.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TH38;TM615
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