Equalization control method for power of plurality of parallel inverters in island microgrid
A multi-inverter, micro-grid technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the harmonic power, feeder impedance inconsistent inverter power sharing control , the program has a large amount of calculation, affecting the rapid response speed of the system, etc.
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Embodiment 1
[0087] A control method for parallel power sharing control of multiple inverters in an island microgrid, the method is applicable to a control system for parallel power sharing of multiple inverters in an island microgrid, and the control system for parallel power sharing of multiple inverters in an island microgrid includes Several parallel inverters, common busbars, linear and non-linear loads, and centralized controller; the main circuit of the inverter includes sequentially connected DC regulated power supplies, H-bridge inverter circuits, LC filter circuits, and feeders, The H-bridge inverter circuit features a S 1 -S 4 Four power switching tubes, the inverter also includes drive and protection circuits, and a local controller; several parallel inverters are connected to a common bus through the feeder, and linear and nonlinear loads are connected to the common bus , there is also a centralized controller on the common bus; the structure of the island microgrid multi-inv...
Embodiment 2
[0105] According to the method for controlling parallel power sharing of multiple inverters in an island microgrid in Embodiment 1, it is further defined as, in the step (1), the centralized controller controls the common bus voltage u pcc Carry out sampling, processing and calculation to obtain the d coordinate component value u of the h order harmonic component of the common bus voltage in the dq coordinate system pcch_d and the q-coordinate component value u pcch_q , the specific steps include:
[0106] a. The centralized controller extracts the common bus voltage u through the sliding window discrete Fourier transform SDFT pcc Fundamental component u pccf_α and the h harmonic component u pcch_α , for u pccf_α Delay a quarter of the power frequency cycle to get the corresponding conjugate value u pccf_β , for u pcch_α Delay a quarter of the h-th harmonic frequency period to obtain the corresponding conjugate value u pcch_β ; The transfer function H of the sliding win...
Embodiment 3
[0116] According to the method for parallel power sharing control of multiple inverters in an island microgrid described in Embodiment 1, it is further defined as, in the step (4), for u pcch_d and u pcch_q Carry out dq / αβ coordinate transformation to get u pcch_α and u pcch_β , the calculation formula is shown in formula (Ⅳ):
[0117] u pcch _ α u pcch _ β = cos ( h θ c ) ...
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