System and method for controlling dynamic stability of DC bus voltage based on dual-PWM energy accumulating current transformer

The invention provides a method for controlling dynamic stability of a DC bus voltage based on a dual-PWM energy accumulating current transformer. The method comprises the steps of comparing an absolute power difference value with a power threshold to output an absolute difference value, dividing the absolute difference value by a network voltage amplitude to obtain a direct-axis current variable quantity, multiplying the direct-axis current variable quantity by a proportionality coefficient to obtain a proportional direct-axis current variable quantity, superposing the proportional direct-axis current variable quantity and an expected direct-axis current value to output a superposed direct-axis current value, dividing an expected reactive power value by the network voltage amplitude to obtain an expected quadrature-axis current value, performing superposing, proportional regulation and integral regulation on the superposed direct-axis current value and the expected quadrature-axis current value, respectively, to obtain an AC-site direct-axis reference voltage and an AC-site quadrature-axis reference voltage, and performing space vector pulse width modulation on the AC-site direct-axis reference voltage and the AC-site quadrature-axis reference voltage to generate a driving signal for controlling the current transformer. The invention also provides a system for controlling the dynamic stability of the DC bus voltage based on the dual-PWM energy accumulating current transformer.