Power grid voltage synchronization signal extraction device and method
A technology of grid voltage and synchronization signal, applied in the field of electrical signal detection, can solve the problem that the speed, accuracy, frequency adaptability and simplicity of synchronization signals cannot be satisfied at the same time, and the calculation of instantaneous symmetrical components increases the calculation amount and the complexity of the system structure. And other issues
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[0068] Please refer to figure 1 , is a schematic structural diagram of an embodiment of the grid voltage synchronization signal extraction device provided by the present invention. It includes: α-β static coordinate system transformation circuit T αβ 1, d-q synchronous rotating coordinate system transformation circuit T dq 2. ANF unit 3, negative sequence component extraction unit 4, subtractor I5, subtractor II6, PI regulator 7, integrator I8, proportional operator I9 and proportional operator II10.
[0069] Among them, the α-β static coordinate system transformation circuit T αβ , which is mainly used to convert the sampling signal u of the grid voltage a , u b and u c Transform to the α-β static coordinate system to obtain the α-axis component u of the grid voltage α and the β-axis component u β .
[0070] Specifically, u a , u b and u c It can be expressed as: u i = U p c...
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