Research And Design Of Analog Power Of The Photovoltaic Cell Array

Photovoltaic (PV) generation is an important part of new energy. As the solar photovoltaic system has been more and more widely used, the demand for its development and test is growing much higher. A new method that substitutes PV arrays simulator for actual PV arrays is found out, which could effectively cut down the development costs, reduce experiment risk as well as increase development efficiency. Accordingly, this paper made a study on the PV arrays simulator.On the basis of research on the photovoltaic principle of solar cell and the mathematical model of PV arrays, this paper firstly deduced the engineering PV arrays mathematical model which can be applied to simulate the output characteristics of PV arrays. The engineering PV arrays mathematical model can simulate the shadowing and uneven light condition under which the power generation efficiency of tandem PV arrays would sharply decline and presented multi-peak power output. Simultaneously, the model can calculate the loss of power generation efficiency result from different resistance characteristics PV cells in parallel.Parallel structure is a normal structure of PV simulator, On the basis of analysis about modeling and controlling features of parallel simulator, this paper established the mathematical model of double BUCK parallel feedback control system. Simulation results showed that changes in feedback coefficient of system would bring about chaos such as bifurcation, and lead to instability which indicated that the correlation between the system stability and system parameter of feedback state was very closed.On the basis of research on the classic control model and state-space average model of single simulator, this paper proposed a parallel equilibrium game arithmetic for the problem about chaos in parallel simulator system. This paper established the game equations by the equilibrium of resistance of simulator. Then this paper solve out the equilibrium control strategy and optimal state point under the condition of each simulator having different control objective.Based on the theoretical analysis, a prototype of the PV arrays simulator was designed. The result of experiment test on parts of circuit indicated that:signal sampling and conditioning circuits were accurate and reliable, the short circuit protection of the prototype of PV arrays simulator was rapid and functional, and the steady-state control accuracy and the performance of transition of dynamic response were good. The prototype of the PV arrays simulator achieved the expected design requirements.