Two-stage photovoltaic grid-connected power generation optimization device, control system and method
A photovoltaic and voltage technology, applied in the field of two-stage photovoltaic grid-connected power generation optimization device, can solve the problems of reducing the control degree of freedom of the inverter, increasing the voltage of the medium-voltage DC bus, and reducing the service life, so as to improve the power quality, The effect of suppressing the double frequency fluctuation and improving the degree of freedom of control
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Embodiment 1
[0054] in such as figure 1 In the two-stage photovoltaic grid-connected power generation system shown, when the voltage of phase A on the AC side of the DC / AC converter drops, the voltage of the medium-voltage DC bus will rise. operation, the present invention provides a two-stage photovoltaic grid-connected power generation optimization device, such as figure 2 As shown, the device includes:
[0055] The double frequency suppression unit is used to filter out the double frequency component in the voltage of the medium voltage DC bus and the inductance current on the side of the medium voltage DC bus;
[0056] The control unit is used for filtering the voltage of the medium-voltage DC bus and filtering the double frequency according to the voltage command value of the medium-voltage DC bus, the current of the medium-voltage DC bus and the inductor current The inductor current on the side of the medium-voltage DC bus of the component determines the optimal command value of t...
Embodiment 2
[0074] Based on the same inventive concept, the present invention also provides a two-stage photovoltaic grid-connected power generation control system, such as Figure 4 As shown, the system includes:
[0075] Optimizing device as recorded in embodiment 1;
[0076] The control device is used to adjust the input current command value of the DC / DC converter in the maximum power point tracking control solar controller to the optimal command value of the input current of the DC / DC converter, and utilize the maximum power point tracking A solar controller is controlled to control the DC / DC converter.
Embodiment 3
[0078] Based on the same inventive concept, the present invention also provides a two-stage photovoltaic grid-connected power generation control method, such as Figure 5 As shown, the method includes:
[0079] Step 1. Determine the DC / DC converter connected to the photovoltaic system through the low-voltage DC bus according to the voltage of the medium-voltage DC bus, the voltage command value of the medium-voltage DC bus, the current of the medium-voltage DC bus, and the inductor current on the side of the medium-voltage DC bus The optimal command value of the input current;
[0080] Step 2. Adjust the input current command value of the DC / DC converter in the maximum power point tracking control solar controller to the optimal command value of the input current of the DC / DC converter, and use the maximum power point tracking control solar energy A controller controls the DC / DC converter.
[0081] In Embodiment 3 of the present invention, the above step 1 includes:
[0082...
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