Method for averagely controlling parallel power of inverters of low-voltage micro-grid
A multi-inverter and micro-grid technology, applied in the direction of sustainable manufacturing/processing, single-network parallel feeding arrangement, climate sustainability, etc., can solve harmonic power and feeder impedance inconsistency inverter power sharing control , Affect the fast response speed of the system, and the program has a large amount of calculation, etc.
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Embodiment 1
[0080] A low-voltage microgrid multi-inverter parallel power sharing control method, the method is suitable for a low-voltage microgrid multi-inverter parallel power sharing control system, the low-voltage microgrid multi-inverter parallel power sharing The control system includes a number of parallel inverters, a common bus, linear and nonlinear loads, and a centralized controller; the main circuit of the inverter includes a DC stabilized power supply, an H-bridge inverter circuit, and an LC filter circuit that are connected in sequence. , feeder, the H-bridge inverter circuit is provided with S 1 -S 4 Four power switch tubes, the inverter also includes a drive and protection circuit and a local controller; a number of parallel inverters are connected to a common bus through the feeder, and the common bus is connected with linear and nonlinear loads , the common bus is also provided with a centralized controller;
[0081] The centralized controller performs sampling process...
Embodiment 2
[0100]The method for controlling power sharing in parallel with multiple inverters in a low-voltage microgrid according to Embodiment 1 is further limited in that, in the step (1), the centralized controller controls the common bus voltage u pcc Perform sampling, processing and calculation to obtain the d coordinate component u of the h-th harmonic component of the common bus voltage in the dq coordinate system pcch_d and the q coordinate component u of the h harmonic component of the common bus voltage in the dq coordinate system pcch_q , the specific steps include:
[0101] a. The centralized controller adopts the sliding window discrete Fourier transform SDFT to extract the common bus voltage u pcc The fundamental component u of pccf_α and the common bus voltage u pcc The h harmonic component u of pcch_α , to the common bus voltage u pcc The fundamental component u of pccf_α Delay a quarter of the power frequency cycle to get the common bus voltage u pcc The fundamen...
Embodiment 3
[0111] The method for controlling the parallel power sharing of multiple inverters in a low-voltage microgrid according to Embodiment 1 is further limited as follows: in the step (3), the instantaneous active power p obtains the active power of the inverter through digital low-pass filtering. The average value of power P and the virtual instantaneous reactive power q are obtained by digital band-pass filtering to obtain the average value of reactive power Q of the inverter. The calculation formula is shown in formula (IV):
[0112] P = ω o s + ω o p Q = ...
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