A Coordinated Control Method for Energy Storage Type Doubly-fed Wind Turbines
A double-fed wind turbine and coordinated control technology, applied in the field of wind power generation, can solve the problems of unit load impact and shutdown, and achieve the effect of accurate control and improved control accuracy
Active Publication Date: 2020-10-23
锐电科技有限公司
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Problems solved by technology
Due to the characteristics of the converter of the doubly-fed unit, during overspeed operation, due to the increase in the slip rate and the output power of the unit, a great pressure will be placed on the current of the grid-side converter, and it is easy to cause an overcurrent fault and shut down. Timely shutdown will further lead to overspeed operation of the unit, which will have a great load impact on the unit
Method used
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] The invention provides a coordinated control method for an energy storage type doubly-fed wind turbine, the method is applied to a doubly-fed wind turbine with an energy storage system, figure 1 It is a schematic diagram of a doubly-fed wind turbine with an energy storage system. As shown in the figure, the doubly-fed wind turbine includes a doubly-fed generator, a machine-side converter, a grid-side converter and an energy storage system;
[0029] The ...
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The invention discloses a coordination control method of an energy storage type doubly fed wind generator set. A machine side converter transmits the self active current value to an energy storage system and a grid side converter in real time, and the energy storage system and the grid side converter transmits respective state information to the machine side converter separately in real time; before a generator reaches a rated rotary speed, the machine side converter is controlled based on the optimal torque; after the generator reaches the rated torque, the machine side converter, by combination with a variable pitch system of the set, controls the power of the set and the rotary speed of the generator, and the grid side converter and the energy storage system jointly control the direct current bus voltage; when air speed is increased suddenly, the set enters an overspeed operating mode; at the moment, for controlling the rotary speed of the generator, the power output by the set is increased alongwith, and consequently, the output current of the grid side converter reaches a second limited amplitude value, and the energy storage system performs information interaction with the grid side converter to improve the weighting factor k so as to increase the current thereof; and after the set quits from the overspeed operating pattern, a control strategy is recovered to the normal pattern.
Description
technical field [0001] The invention relates to the field of wind power generation, in particular to a coordinated control method for an energy storage type double-fed wind turbine. Background technique [0002] Considering the actual operation of wind power grid-connected and the long-term interests of large-scale wind farm development, improving the controllability of wind farm output power and low voltage ride-through capability is an important development direction of wind power technology. Doubly-fed wind turbines of mainstream models have the ability to suppress output power fluctuations and certain low-voltage ride-through capabilities, but their capabilities are limited. [0003] The energy storage system has the ability to dynamically absorb excess energy and release it in a timely manner, which can well overcome the intermittent and fluctuating shortcomings of wind power. Therefore, it can be considered to equip wind farms with energy storage systems with reasonab...
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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/386H02J3/32Y02E10/76Y02E70/30
Inventor 华青松刘志李杨胡兵刘海东
Owner 锐电科技有限公司