Energy storage smart transformer for wind power generation system
A technology of wind power generation system and intelligent transformer, applied in wind power generation, AC network voltage adjustment, electrical components, etc., can solve the problems of wind power output fluctuation, affecting the safe operation of the power grid, aggravating faults, etc., to achieve voltage stability and improve low voltage The effect of traversing ability and smoothing of active power fluctuations
Active Publication Date: 2017-03-22
STATE GRID CORP OF CHINA +2
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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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[0016] Such as figure 1 As shown, the wind power generation system applying the energy storage type intelligent transformer of this embodiment includes a wind power generating unit 2, a power frequency step-up transformer 3 and a power grid 4, and the high voltage side of the power frequency step-up transformer 3 is connected with the power grid 4. The energy storage type intelligent transformer includes three single-phase energy storage type transformation units 1 (1#1~1#3) respectively corresponding to the three-phase lines, and the internal structures of 1#2 and 1#3 are exactly the same as those of 1#1 , in order to simplify the description, the detailed internal structure is not repeated).
[0017] Such as figure 1 As shown, the single-phase energy storage type transformation unit 1 includes a single-phase full-bridge power frequency AC-DC converter 11 on the low-voltage side, a single-phase full-bridge high-frequency DC-AC converter 12 on the low-voltage side, and a bidi...
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The invention discloses an energy storage type intelligent transformer for a wind power generation system. The energy storage type intelligent transformer comprises a power frequency boosting transformer and three single-phase energy storage type voltage transformation units which correspond to three-phase lines of the power frequency boosting transformer respectively. Each single-phase energy storage type voltage transformation unit comprises a low-voltage-side single-phase full-bridge power frequency DC-AC converter, a low-voltage-side single-phase full-bridge high-frequency DC-AC converter, a two-way DC-DC converter, an energy storage device, a multi-winding high-frequency transformer, one or more high-voltage-side single-phase full-bridge high-frequency DC-AC converters and one or more high-voltage-side single-phase full-bridge power frequency DC-AC converters, wherein the high-voltage-side single-phase full-bridge high-frequency DC-AC converters correspond to the high-voltage-side single-phase full-bridge power frequency DC-AC converters in a one-to-one mode, and all the high-voltage-side single-phase full-bridge power frequency DC-AC converters are sequentially cascaded into a chain through two alternating current ports. The energy storage type intelligent transformer 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 technical field of wind power generation, in particular to an energy storage intelligent transformer used in a wind power generation system. 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 f...
Claims
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IPC IPC(8): H02J3/38H02J3/28H02J3/18H02J3/12
CPCH02J3/24H02J3/32H02J3/386Y02E10/76Y02E40/30Y02E70/30
Inventor 张坤刘鑫周滨李光星
Owner STATE GRID CORP OF CHINA