Power optimal distribution control method of energy storage of all-vanadium redox flow battery used in high-capacity wind power plant

An all-vanadium redox flow battery and power optimization technology, applied in the field of battery energy storage, can solve the problems of different operating conditions, reduced wind power leveling efficiency and energy storage utilization, affecting battery life and safe and stable operation, etc.

Inactive Publication Date: 2013-04-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The energy storage of all-vanadium redox flow battery is being gradually applied due to its simple structure, repeated re-discharging process will not cause the battery capacity to drop, etc. Due to the influence of variables and other factors, the operating status of each battery pack is different, resulting in a difference in the state of charge value
If the stabiliz

Method used

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  • Power optimal distribution control method of energy storage of all-vanadium redox flow battery used in high-capacity wind power plant
  • Power optimal distribution control method of energy storage of all-vanadium redox flow battery used in high-capacity wind power plant
  • Power optimal distribution control method of energy storage of all-vanadium redox flow battery used in high-capacity wind power plant

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Experimental program
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Embodiment 1

[0053] figure 1 A schematic diagram of the connection of a wind farm with multi-stage all-vanadium redox flow battery energy storage, figure 2 is a bidirectional DC / DC converter control block diagram, image 3 It is a flow chart of power optimization distribution control for a multi-level VRB energy storage system, as shown in the figure: the method for optimal distribution control of energy storage power of an all-vanadium redox flow battery for a large-capacity wind farm provided by the present invention includes the following steps:

[0054] S1: Detect the output power signal P of the wind farm when the VRB battery pack is actually running and working wind ;

[0055] S2: Output power signal P through the wind farm wind to calculate the energy storage stabilization target power given value signal It is achieved by:

[0056] The detected wind farm output power signal P wind The power signal P injected into the power grid is obtained through the low-pass filter 1 (1+Ts...

Embodiment 2

[0087] Embodiment 2 provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0088] Such as figure 1 As shown, 1 represents a typical wind farm, 2 represents a voltage-type three-phase PWM inverter, 3 represents a multiple bidirectional DC / DC converter, 4 represents an all-vanadium redox flow battery pack, and 5 represents an infinite system; a typical wind farm includes The gearbox 12 connected to the wind turbine 11, the rotor-side converter 13 and the grid-side converter 14 are connected and connected to the wires; a four-quadrant AC-DC voltage type PWM converter is used to cascade multiple bidirectional BuckBoost DC converters As an interface for energy exchange between the energy storage system and the grid, it is connected in parallel to the grid bus at the outlet of the wind turbine through a step-up transformer. By controlling the bidirectional DC / DC converter, the charging and discharging process of each VRB...

Embodiment 3

[0108] Since the actual operating status of each VRB group is different, the state of charge is different. The battery pack with the smallest SOC value is selected as the optimal rechargeable battery pack or the one with the largest SOC value is used as the optimal discharge battery pack. The maximum charging and discharging power corresponding to the upper limit of the charging voltage and the lower limit of the discharging voltage is the constraint condition of safe charging and discharging. Through the optimized power distribution control of the energy storage of the multi-stage all-vanadium redox flow battery, the number of charging and discharging cycles of the battery pack is reduced, ensuring that the battery The group works in the safe operating area.

[0109] Adopt the method described in the present invention, take 2MW wind turbine and 2 VRB groups as example, carry out experimental comparative analysis to the effectiveness of optimized power distribution control stra...

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Abstract

The invention provides a power optimal distribution control method of energy storage of an all-vanadium redox flow battery used in a high-capacity wind power plant. The power optimal distribution control method of the energy storage of the all-vanadium redox flow battery used in the high-capacity wind power plant adopts an all-vanadium redox flow battery (VRB) energy storage systems port with cascade connection between a direct current (DC) / alternating current (AC) convertor and a bi-direction DC / DC convertor. Difference of values of state of charge (SOC) of VRBs in a process of restraining power fluctuation of the wind power plant, wherein the VRBs are connected in parallel in a multi-level mode is considered. A power distribution module with a first choice of a charging state of each level VRB being an optimal charge-discharge battery set and an optimizing power distribution unit of corresponding maximum charge-discharge power a limiting value of charge-discharge voltage being the constraint condition is designed, wherein the power distribution module is capable of achieving a multi-level VRB system. According to the power optimal distribution control method, a conventional distribution principle of average power is abandoned, power fluctuation of the wind power plant is restrained well, number of circulate charge-discharge times of each VRB set in a high-capacity energy storage system is effectively reduced at the same time, and the batteries are enabled to operate in a safe and stable operation area.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage for wind farm operation, and particularly relates to a power optimization distribution control method for multi-stage all-vanadium redox flow battery energy storage used in large-capacity wind farms, specifically including the all-vanadium redox flow battery energy storage system in stable A control method for the given value of the smoothing target power assigned to each VRB group during the power fluctuation process of the wind farm. Background technique [0002] With large-scale wind power connected to the grid, the fluctuation and randomness of its output power have brought an impact on the safe and stable operation of the power grid, and energy storage technology is one of the effective means to solve these problems, such as at the outlet side of wind farm grid connection The installation of energy storage power stations with a certain capacity can smooth the power fluctuations...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCY02E10/76Y02E70/30
Inventor 李辉付博杨超陈耀君秦星季海婷何蓓
Owner CHONGQING UNIV
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