Primary frequency modulation method of doubly-fed wind-driven generator set based on variable power point tracking and supercapacitor energy storage coordinated control

A technology of doubly-fed wind turbines and supercapacitors, which can be used in current collectors, battery circuit devices, reducing/preventing power oscillations, etc., and can solve problems such as wind turbines not having frequency modulation capabilities

Active Publication Date: 2019-10-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

There is also a strategy to compensate the virtual inertia of the wind farm based on energy storage technology, but the wind turbine itself does not have the ability to operate autonomously and participate in system frequency regulation

Method used

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  • Primary frequency modulation method of doubly-fed wind-driven generator set based on variable power point tracking and supercapacitor energy storage coordinated control
  • Primary frequency modulation method of doubly-fed wind-driven generator set based on variable power point tracking and supercapacitor energy storage coordinated control
  • Primary frequency modulation method of doubly-fed wind-driven generator set based on variable power point tracking and supercapacitor energy storage coordinated control

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Embodiment Construction

[0014] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] The design method proposed by the present invention mainly includes two parts, variable power point tracking control under sudden load decrease disturbance and supercapacitor energy storage control under sudden load increase disturbance, the control schematic diagram is as follows figure 1 with figure 2 shown. On the one hand, the overspeed load shedding control loses the power generation benefits of the wind farm during normal operation, and on the other hand, it does not take into account the speed and power adjustment depth under the disturbance of sudden load drop, and the adjustment effect is not good. In response to this problem, the present invention further explores and finds that the maximum power tracking mode can maximize the power generation efficiency in the normal operation mode. If it can participate in frequency regulation under the disturban...

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Abstract

The invention discloses a primary frequency modulation method of a doubly-fed wind-driven generator set based on variable power point tracking and supercapacitor energy storage coordinated control inthe technical field of new energy so as to enable the wind-driven generator to perform maximum power point tracking without disturbance or a system load increase and maximize the power generation benefit. When the load is reduced, the primary frequency adjustment control is started, the additional power is superimposed onto the output power under the maximum power tracking according to the frequency deviation and the virtual inertia control to obtain the final reference power to achieve the frequency adjustment. In order to realize the spare capacity supply required by primary frequency modulation, the supercapacitor is connected through a bidirectional DC / DC converter to the DC-side bus capacitor of the doubly-fed wind-driven generator set. A grid-side converter has a function of maintaining the stability of the DC bus capacitor voltage. The discharge power of the supercapacitor energy storage device flows directly to the load side through the grid-side converter.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for primary frequency regulation of a doubly-fed wind turbine based on variable power point tracking and coordinated control of supercapacitor energy storage. Background technique [0002] According to data released by the International Energy Agency (IEA), the proportion of wind power in the energy structure has increased year by year since 2009, with an average annual increase of 0.44%. In 2017, wind power accounted for 5.6% of global energy demand. The penetration rate of wind power has a continuous growth trend. The frequency converter control strategy of doubly-fed wind turbines can realize the decoupling of active power and reactive power, and realize the function of variable speed and constant frequency, which is one of the mainstream models. The resulting problem is that there is no coupling relationship between the DFIG rotor speed and the system...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/32H02J7/34H02J3/38
CPCH02J3/386H02J3/24H02J3/32H02J7/345Y02E70/30Y02E10/76
Inventor 颜湘武宋子君
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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