A grid voltage phase-locking method and system
A grid voltage and phase-locked technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as lowering system reliability, PI controller phase-locked loop frequency fluctuations, and inability to intuitively obtain grid voltage angular velocity, etc. , to achieve the effect of convenient power grid voltage angular velocity, high phase-locking precision, and convenience
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[0048] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0049] Such as image 3 As shown, the steps of the grid voltage phase-locking method in this embodiment include:
[0050] 1) The sampling value of the three-phase voltage (U a , U b , U c ) to extract the positive sequence components to get U a+ , U b+ , U c+ ;
[0051] 2) The extracted positive sequence component (U a+ , U b+ , U c+ ) into the αβ two-phase stationary coordinate system, and get U α+ and U β+ ;
[0052] 3) The voltage components in the αβ two-phase stationary coordinate system (get U α+ and U β+ ) to dq two-phase rotating coordinate system (get U d and U q ), according to the voltage component transformed to the dq...
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