Wind turbine generator high-voltage ride-through control strategy for full-power conversion
A wind turbine and control strategy technology, applied in AC network voltage adjustment, wind power generation, AC network circuits, etc., can solve problems such as poor operability, control stability to be verified, long renovation period, etc., to ensure reactive power support capability and active power balance, improve stability and economy, and meet the effect of voltage vector control requirements
Pending Publication Date: 2021-10-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
The overall control performance of these schemes is relatively superior, but the investment cost is high, the renovation period is long, and the control stability needs to be verified. In addition, the dynamic reactive power compensation device often does not have the fault ride-through capability in actual operation, and may be disconnected before the wind turbine during the fault period.
[0008] Although the research results of improving the fault ride-through capability from the perspective of the system station are relatively rich, the actual operability is poor. According to the requirements of the wind turbine grid-connected guidelines, the power factor of the generator set should be within the range of leading 0.95 to lagging 0.95. adjust
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[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0035] When a high-voltage fault occurs in the power grid, it is mainly the grid-side converter that receives the voltage impact and responds to the fault ride-through. This invention uses the permanent magnet direct-drive synchronous unit under high-power operation based on the working principle of the grid-side converter. The control strategy is introduced through the L-type filter grid-connected model as an example.
[0036] The grid-side inverter mostly adopts vector control based on grid voltage orientation, that is, the d and q axis components of the grid-connected point voltage are V pccd =V pcc , V pccq =0, its equation in d / q coordinate system in steady state is:
[0037]
[0038] In the formula, V pcc is the grid-connected point voltage, V e is the converter output voltage, I g is the injected grid current, ω g is the grid angular velocity...
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The invention provides a wind turbine generator high-voltage ride-through control strategy for full-power conversion based on dynamic reactive power support, and aims to solve the problem that a wind turbine generator off-grid accident is caused by frequent fault disturbance of a high-proportion new energy power system, and the wind turbine generator fault ride-through performance is low. By analyzing the vector control principle of a grid-side inverter, on the basis of related standard requirements, grid-connected point transient overvoltage is divided into four grades according to the maximum voltage and the maximum current of the alternating current side, active current reference values and reactive current reference values in different grades are determined respectively, overvoltage impact is buffered by means of the voltage division effect of a filter inductor, and an energy storage device is additionally arranged in the direct current side to stabilize the active unbalance fluctuation of the bus. According to the strategy, grid-side inverter control is improved on the basis that only energy storage equipment is added, so that the voltage vector control requirement of the converter is met, reactive support current injected into a power grid by a fan is increased, and the fault ride-through stability and economical efficiency of the wind turbine generator are improved.
Description
technical field [0001] The invention relates to the field of wind turbine grid-side inverter control, in particular to a high-voltage ride-through control strategy for wind turbines with full power conversion. Background technique [0002] Wind power generation has been rapidly promoted around the world in recent decades. With the continuous increase in the proportion of wind power installed capacity, the characteristics of "weak power grid" caused by uneven distribution of source and load have become more and more obvious. When various faults occur, the power grid is easily Causes large fluctuations in frequency and voltage to oscillate. Among them, due to the transient overvoltage of the power grid, the incidents of triggering the off-grid of wind turbines occur frequently, and even lead to chain reactions in serious cases, causing major blackouts. [0003] The research status shows that grid overvoltage is often caused by indirect incentives. In the UHV AC transmission ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J3/38H02J3/16H02J3/28H02J3/26H02J3/24
CPCH02J3/381H02J3/16H02J3/28H02J3/26H02J3/24H02J2300/28Y02E10/76Y02E40/30Y02E40/50
Inventor 颜湘武隗小雪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)