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Based on double PWM structure, analyses each part of system energy relationship on the basis of system energy flow theory when system in the energy balance state and unbalance state and build energy mathematic model of double PWM. In order to solve the problem that the DC bus voltage fluctuation and the system output power not matches the system input power dues to the system output energy not matches the system input energy, build constraint condition of DC bus voltage fluctuation and grid-side current component in the d axis. The condition can ensure the system energy smoothly varies. Using constraint condition to correct voltage outer loop and power inter loop, realize the output energy of rectifier side can fast match with the loss energy of inverter side. So the double PWM structure can ensure each part coordinated control of system. According to results of simulation, the system can realize system energy fast in balanced state and reduce DC bus voltage fluctuation when the power of load motor suddenly varies. This method also can reduce the harmonic current and capacity of the DC side capacitors.