Distributed virtual synchronous-generator low voltage crossing control method
A low-voltage ride-through and virtual synchronization technology, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the requirements that do not involve reactive current injection and cannot meet low voltage Overcoming the requirements of relevant standards and other issues to achieve the effect of enhancing reactive power support capability, improving control accuracy and response speed, and suppressing steady-state overcurrent
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[0042] The present invention will be further described below in conjunction with accompanying drawing and working principle.
[0043] Such as figure 1 As shown, the present invention is based on the VSG-based LVRT technology, mainly through virtual impedance control and virtual synchronous balanced current control, to suppress the fault instantaneous current and steady-state current overcurrent when the short-circuit fault of the distribution network causes the voltage drop at the grid-connected point, and By changing the given value of reactive power to achieve the purpose of injecting the specified reactive current, the control target of grid-connected inverter LVRT based on VSG control is realized.
[0044] Such as figure 2 As shown, the control method of the embodiment of the present invention includes the following steps:
[0045] 1. Sampling to obtain grid voltage u gabc , capacitor voltage u cabc , Converter side inductor current i 1abc and grid side output curren...
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