Interconnection line-free secondary control method of parallel inverters in micro grid
A secondary control, inverter technology, applied in reactive power compensation, AC network voltage adjustment, single-grid parallel feeding arrangement, etc., can solve the problem of high power capacity requirements and limited power of the main inverter
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[0060] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0061] The present invention provides a novel secondary control method aimed at eliminating frequency and voltage amplitude deviations of drooping control inverters in microgrids, referring to figure 1 and figure 2 , figure 2 Take the increase of active load as an example to show the system adjustment process. The steady-state operating point of the master-slave inverter before the load change is as follows: figure 2 As shown in (a); when the active load increases, the system frequency decreases, and the working state of the master-slave inverter before the secondary control starts is as follows figure 2 As shown in (b); when the secondary control is turned on, the output active power of the slave inverter increases, and the system frequency returns to the rated value. The steady-state ...
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