I. System composition and working principle 1. Structural diagram of photovoltaic water pump system Figure 1 Structural diagram of the system As shown in Figure 1, the system uses solar cell arrays to directly convert solar energy into electrical energy, and after DC-DC boost and inverter with TMPPT function, outputs three-phase AC voltage to drive AC asynchronous motor and water pump load to complete the function of storing water in the water tower. It mainly includes four parts: solar cell array, inverter with TMPPT function, pump load and water storage device. 2. Inverter main circuit and hardware composition The main circuit and hardware control block diagram used in this system are shown in Figure 2. The DC-DC part of the main circuit adopts a push-pull forward circuit with superior performance for boosting; the DC-AC part adopts a three-phase bridge inverter circuit, and the main power device adopts ASIPM (integrated intelligent power module) PS12036. The system control core is composed of a 16-bit digital signal controller dsPIC30F2010. The peripheral control circuit includes array bus voltage detection and water level dry detection circuit. The system first works through the initial setting of the working mode and PI parameters, and then the voltage value searched by the MPPT subroutine in real time is used as the given of the inner loop CVT. The working frequency value is obtained through PI adjustment, and the duty cycle of the PWM signal is calculated to realize the true maximum power tracking (TMPPT) of the photovoltaic array, and keep the V/f ratio of the asynchronous motor constant. The system combines MPPT and inverter, and uses the fault detection function of the ASIPM module for detection and protection. It has a simple structure and is easy to control. dsPIC30F2010 Chinese data sheet dsPIC30F2010 pdf datasheet
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