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Rotor side energy storage DC grid-connected double-fed wind power generation system and control method thereof

A double-fed wind power generation and wind power generator technology, applied in the direction of generator control circuit, DC network circuit device, DC power supply parallel operation, etc. Battery service life and other issues, to achieve the effect of flexibly adjusting power generation, solving wind power fluctuations, and improving wind energy utilization

Pending Publication Date: 2021-10-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, when the wind power generation system is AC-connected to the grid, the charging and discharging state of the battery cannot be flexibly controlled. This is because the stator voltage frequency can only be constant at the power frequency, and the synchronous speed is also a constant value. When the rotational speed is higher than the synchronous speed, In order to charge the battery, the speed is lower than the synchronous speed, the battery is discharged, and it cannot be charged and discharged flexibly according to the state of the battery itself. Even if the wind speed is too low or too high, the discharge and charge current of the battery may exceed the maximum charge and discharge allowed by the battery. battery, affecting battery life

Method used

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  • Rotor side energy storage DC grid-connected double-fed wind power generation system and control method thereof
  • Rotor side energy storage DC grid-connected double-fed wind power generation system and control method thereof
  • Rotor side energy storage DC grid-connected double-fed wind power generation system and control method thereof

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Experimental program
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Embodiment 1

[0045] DC grid-connected doubly-fed wind power generation system with rotor side energy storage

[0046] Such as figure 2 As shown, it includes double-fed wind power generator DFIG and energy storage device. In this embodiment, the energy storage device adopts energy storage battery 1, but it is not limited to battery energy storage, and also includes energy storage devices such as supercapacitors and solid-state batteries. Among them, the battery energy storage is composed of 70-200 battery cells in series, the voltage range is 200V to 600V, and the battery current range is 20Ah-300Ah. The rotor side of the double-fed wind generator is connected to the energy storage device through the rotor-side converter RSC 4, and the stator side of the double-fed wind generator is connected to the DC power grid through the diode rectifier bridge 8. In this embodiment, the diode The rectifier bridge is an uncontrollable diode rectifier bridge, so that the stator side of the doubly-fed wi...

Embodiment 2

[0057] Control method of DC grid-connected doubly-fed wind power generation system with rotor side energy storage

[0058] Such as image 3 shown, including the following steps:

[0059] Step 1: Obtain the stator side current i of the double-fed wind turbine through the current sensor and the voltage sensor sa i sb i sc , rotor side current i ra i rb i rc and stator side voltage u sa , u sb , u sc ; Obtain the rotor speed n of the doubly-fed wind turbine through the optical code disc r .

[0060] image 3 In, θ s Indicates the stator position angle, θ r Indicates the rotor position angle, θ sl Indicates the slip angle, ω r Indicates the angular velocity of the rotor.

[0061] Step 2: Determine the current reference value of the current of the energy storage device according to the current wind force parameters and the current parameters of the energy storage device; obtain the current stator voltage frequency reference value according to the current rotor speed...

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Abstract

The invention relates to a rotor side energy storage DC grid-connected doubly-fed wind power generation system and a control method thereof. The rotor side of a doubly-fed wind power generator is connected with an energy storage device through a rotor side converter RSC, and the stator side of the doubly-fed wind power generator is connected with a DC power grid through a diode rectifier bridge; the signal input end of a control unit is connected with the signal output ends of a current sensor, a voltage sensor and an optical code disc; and the control unit controls the rotor side converter RSC according to a rotor voltage reference value obtained by a PI adjusting unit so as to control charging and discharging of the energy storage device. According to the invention, charging and discharging of the energy storage device can be flexibly and effectively controlled.

Description

technical field [0001] The invention relates to a DC grid-connected double-fed wind power generation system with energy storage on the rotor side and a control method thereof. Background technique [0002] The development of new energy is an important measure to solve the energy crisis and achieve the goal of carbon neutrality in my country. Wind energy reserves are abundant, and it is one of the new energy sources with the greatest development potential. Among them, the double-fed wind generator (DFIG) has high power generation efficiency, small power converter capacity, and low cost. [0003] Due to the intermittent and unstable characteristics of wind power, energy storage is often used in wind power generation systems to play an important role in stabilizing wind power fluctuations and improving the stability of the power system. The integration of energy storage into wind power generation systems usually requires additional equipment such as DC-DC converters for charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14H02P9/00H02P9/14H02P101/15
CPCH02J1/102H02J1/14H02P9/007H02P9/14H02J2300/28H02P2101/15
Inventor 崔学深吴浩刘其辉赵成勇申旭辉汤海雁李峥
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)