A novel stability analysis method for a cascade system of a three-phase voltage source PWM rectifier and LLC resonant converter
A resonant converter, cascade system technology, applied in the direction of converting AC power input into DC power output, DC power input into DC power output, adjusting electrical variables, etc., can solve the grid-connected system oscillation, instability, threats to the power grid Power quality and other issues to achieve the effect of improving accuracy and improving stability margin
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[0038] In order to make the objects and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0039] The cascade system structure diagram of the present invention refers to figure 1 As shown, the cascaded system consists of a three-phase balanced voltage PWM rectifier and an LLC resonant converter.
[0040] figure 2 It is the circuit topology diagram of the three-phase balanced voltage PWM rectifier with pure resistance. In the figure, there are 3 pairs of switch tubes S ah , S bh , S ch , S al , S bl , S cl A three-phase full-bridge PWM circuit is formed; L is the filter inductance of the converter, and the current of the ideal grid flows into the converter through the inductance, respectively: i a i b i c ; Three-phase bala...
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