Energy storage type electric energy quality regulator for wind power generation system

Abstract

The invention discloses an energy storage type electric energy quality regulator for a wind power generation system. The energy storage type electric energy quality regulator comprises a three-phase full-bridge DC-AC converter, a three-phase half-bridge DC-AC converter, a two-way DC-DC converter and an energy storage device. One outgoing line terminal of an alternating current port of each phase of the three-phase full-bridge DC-AC converter is connected with an outgoing line terminal of the corresponding phase in a wind power generation set, and the other outgoing line terminal is connected with a connecting terminal of the corresponding phase in the low-voltage side of a boosting transformer. Direct current ports of all phases of the three-phase full-bridge DC-AC converter are connected with a direct current port of the three-phase half-bridge DC-AC converter, and three alternating current ports of the three-phase half-bridge DC-AC converter are connected with a connecting port in the low-voltage side of the boosting transformer. The energy storage device is connected with the alternating current ports of the three-phase half-bridge DC-AC converter through the two-way DC-DC converter. The energy storage type electric energy quality regulator can smooth the power fluctuation of wind power and improve the low voltage ride-through capacity of the wind power.

Description

technical field [0001] The invention relates to the field of wind power generation systems, in particular to an energy storage type power quality regulator used in wind power generation systems. Background technique [0002] At present, the challenges faced by the wind power system mainly come from two aspects: On the one hand, due to the fluctuation of wind energy resources, the wind power output also fluctuates, which will affect the power quality of the grid under the condition of high wind power penetration rate. and its stability have a greater negative impact. On the other hand, as the proportion of wind power in the power grid continues to increase, if the wind turbines still adopt a passive protective decoupling method when the power grid fails, it will increase the difficulty of restoring the entire system, and may even aggravate the failure, seriously affect the safe operation of the power grid. For this reason, the new power grid rules require that when the grid...

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Problems solved by technology

[0002] At present, the challenges faced by the wind power system mainly come from two aspects: On the one hand, due to the fluctuation of wind energy resources, the wind power output also fluctuates, which will affect the power quality of the grid under the condition of high wind power penetration rate. and its stability have a greater negative impact on

On the other hand, as the proportion of wind power in the power grid continues to increase, if the wind turbines still adopt a passive protective decoupling method when the power grid fails, it will increase the difficulty of restoring the entire system, and may even aggravate the failure, seriously Affect the safe operation of the grid

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