Photovoltaic micro-network-system off-grid/grid-connected control method based on inverse droop control
A control method and photovoltaic technology, applied in photovoltaic power generation, AC network circuits, single-network parallel feeding arrangements, etc., can solve the problem that the grid-connected current waveform cannot reach the ideal state, the output current of the inverter cannot be directly controlled, and the power quality is not good. Control and other issues
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specific Embodiment approach 1
[0061] Specific implementation mode one: refer to figure 1 This embodiment is described in detail. In the off-grid control method of a photovoltaic microgrid system based on inverse droop control described in this embodiment, the photovoltaic microgrid system includes a capacitor C 1 , capacitance C ac , capacitance C 2 , diode D, full bridge inverter circuit VD, switch tube T 0 , inductance L and inductance Lac;
[0062] Capacitance C 1 Connect the two ends of the photovoltaic array PV to the output end of the capacitor C 1 One end of the inductor L is connected to one end of the inductor L, and the other end of the inductor L is connected to the switch tube T 0 The collector and the anode of the diode D, the switching tube T 0 The emitter, capacitor C 1 the other end of the capacitor C 2 One end of each is connected to an input end of the full-bridge inverter circuit VD, and the capacitor C 2 The other end of the diode D is connected to the negative pole of the diod...
specific Embodiment approach 2
[0070] Specific embodiment 2: This embodiment is to further explain the off-grid control method of photovoltaic microgrid system based on inverse droop control described in specific embodiment 1. In this embodiment, in step 1, the switching tube T 0 The specific process of driving the modulation signal is:
[0071] Using the inverse droop equation for capacitance C ac The voltage U at both ends is processed to obtain the reference power P output by the full-bridge inverter, and the reference power P output by the full-bridge inverter is divided by the capacitor C 1 Voltage at both ends U PV , get I PVref , and the photovoltaic array PV output current I PV After making a difference, perform PI adjustment to generate the switching tube T 0 drive modulation signal.
specific Embodiment approach 3
[0072] Specific embodiment three: This embodiment is a further description of the photovoltaic microgrid system off-grid control method based on inverse droop control described in specific embodiment one. In this embodiment, in step three, the off-grid inverter voltage output Module 2 pair U, i ac i L and I ref The specific process of processing and generating the driving signal of the full-bridge inverter is as follows:
[0073] Step 31, according to i ac and U to get the reactive power Q output by the full-bridge inverter circuit, use the droop equation to process the reactive power Q output by the full-bridge inverter circuit, and obtain the output reference angular frequency ω of the full-bridge inverter circuit ref ;
[0074] Step three two, I ref and ω ref Through the reference current generation module, generate the output current reference i of the full-bridge inverter circuit acref ;
[0075] Step three three, i acref with i L Perform PR control after making...
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