A control method for reducing voltage unbalance at grid-connected point of photovoltaic power generation system
A photovoltaic power generation system, voltage unbalanced technology, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the grid voltage distortion, high harmonic content of current injected into the grid, affecting the friendly and safe operation of the inverter and the grid and other issues to achieve the effect of reducing the imbalance
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[0062] Such as figure 1 As shown, a control method for reducing the voltage unbalance at the grid-connected point of a photovoltaic power generation system includes the following steps:
[0063] Step 1: Calculate the reference current: including the following specific steps:
[0064] Step 1-1: Calculate the positive sequence current of the positive sequence circuit:
[0065]
[0066] where, where, U 1 is the rated voltage of grid-connected point, is the positive sequence component of the fault point voltage, Z is the equivalent impedance modulus of the line, δ is the impedance angle of the equivalent impedance of the line, is the positive sequence current.
[0067] Step 1-2: Calculate the negative sequence current of the negative sequence circuit:
[0068]
[0069] in, is the negative sequence component of the fault point voltage, is the negative sequence current.
[0070] Step 2: Set the reference current: Contains the following specific steps:
[0071] Ste...
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