The work of the energy feedback unit is also very important. Their functions are as follows:<br>1. Equalize the energy of the PWM converter before and after the system and<br>energy back into the grid to save energy;<br>2. Suitable for maintaining the intermediate voltage due to an energy feedback control unit;<br>Three. With proper control, energy can be returned to the network with a high labour factor, which ensures a harmonious<br>golf.<br>First, the energy balance management of the energy recovery unit is analysed.<br>Of these you are to test the corresponding power source, n is the input and output current, P and Q are the active power and the reactive power on the input side, P2 and e2 are the active power and the reactive power on the output side, P. the total voltage is Ua. If the system is stable, the energy ratio is as follows:<br>
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