Active current rapid recovery control method after low voltage ride through
A low-voltage ride-through and active current technology, applied in the power grid field, can solve the problems of slow recovery of active current, slow change of PV voltage, slow change of bus reference voltage, etc., to achieve the effect of improving recovery speed and consistent output current
Pending Publication Date: 2022-04-08
NINGBO GINLONG TECH
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[0003] When the traditional low voltage ride through is restored, its bus reference voltage is determined by the PV voltage at the input terminal and the AC voltage at the output terminal, and the PV voltage at the output terminal is determined by MPPT tracking. MPPT tracking takes one second at a time, resulting in slow changes in the PV voltage at the input terminal. Causes the bus reference voltage to change slowly, making the recovery of the active current very slow
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top "Face", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
[0018] refer to figure 1 As shown, a method for fast recovery control of active current after low voltage ride-through in this embodiment includes the following steps: S1: the power generation system passes the bus reference voltage through a low-pass filter before low-voltage ride-through, and only passes through one low-pass filter , to obtain the filter value; the filter value characterizes the actual voltage value of the bus reference voltage.
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The invention relates to the technical field of power grids, and discloses an active current quick recovery control method after low voltage ride through, which is characterized by comprising the following steps of: enabling bus reference voltage to pass through a low-pass filter to obtain a filtering value before low voltage ride through of a power generation system, and enabling the bus reference voltage to pass through the low-pass filter to obtain a filtering value before low voltage ride through of the power generation system; and after low voltage ride through, the filtering value is assigned to the bus reference voltage, so that the bus reference voltage after low voltage ride through is the same as the bus reference voltage before low voltage ride through, the output current is consistent, and the recovery speed of the active current is improved. And the reference voltage of the bus is assigned according to different assignment time and corresponding assignment step proportions, so that the output current value can be prevented from instantly increasing after the low-voltage ride-through mode is quitted to a certain extent.
Description
technical field [0001] The invention relates to the technical field of power grids, in particular to a fast recovery control method for active current after low-voltage ride-through. Background technique [0002] Low voltage ride through is the ability of a small power generation system to withstand a certain limit of grid low voltage within a certain period of time without quitting operation; [0003] When the traditional low voltage ride through is restored, the bus reference voltage is determined by the PV voltage at the input terminal and the AC voltage at the output terminal, and the PV voltage at the output terminal is determined by MPPT tracking. MPPT tracking takes one second at a time, resulting in slow changes in the PV voltage at the input terminal. As a result, the bus reference voltage changes slowly, making the recovery of active current very slow. Contents of the invention [0004] In view of the deficiencies in the prior art, the purpose of the present inv...
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IPC IPC(8): G06Q10/06G06Q50/06H02J3/01H02J3/38
CPCY02E40/40
Inventor 王一鸣许颇王海鹏刘聪哲夏鲲蔡旭
Owner NINGBO GINLONG TECH