Control method for stabilizing wind and light output power fluctuation through hybrid energy storage system

A hybrid energy storage system and output power technology, applied in the direction of reducing/preventing power oscillation, photovoltaic power generation, wind power generation, etc., can solve problems such as reducing the effective utilization rate of renewable energy, improve acceptance capacity and stability, and respond quickly , Improve the effect of power quality

Active Publication Date: 2014-02-19
STATE GRID CORP OF CHINA +3
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AI Technical Summary

Problems solved by technology

Adjusting distributed power itself can reduce the output fluctuation of distributed power to a certain extent, but at the same time it also reduces the effective utilization rate of renewable energy; the rapid development of energy storage technology provides a new idea for smoothing the fluctuation of wind power

Method used

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  • Control method for stabilizing wind and light output power fluctuation through hybrid energy storage system
  • Control method for stabilizing wind and light output power fluctuation through hybrid energy storage system
  • Control method for stabilizing wind and light output power fluctuation through hybrid energy storage system

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Embodiment Construction

[0026] See attached figure 1 , the control method for the hybrid energy storage system of the present invention to stabilize the fluctuation of wind and solar output power, the specific steps are as follows:

[0027] (1) The sampling interval of the system is Δt, and the initial time is t 1 . t i Time, collect the current wind power and photovoltaic output P wt ,P pv And the state of charge SOC of the supercapacitor itself uc ;

[0028] (2) The supercapacitor aims at smoothing the fluctuation of the original wind power output power, performs the first level of stabilization, and calculates the power fluctuation amount at the current moment ΔP=P wt (t i )+P pv (t i )-P ucaf (t i-1 ), where P ucaf (t i-1 ) is the wind and solar output power stabilized by the super capacitor at the previous moment;

[0029] (3) Determine ɑ(|ΔP|) according to the size of |ΔP|, and ɑ(|ΔP|) is the defined weight coefficient, which is used to represent the contribution of the power fluc...

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Abstract

The invention provides a control method for stabilizing wind and light output power fluctuation through a hybrid energy storage system. The control method is characterized in that a super capacitor and a storage battery complement each other to conduct two-level stabilizing on wind and light output power, the same algorithm is adopted in two levels of stabilizing, required smooth wind and light output power, surplus capacity of an energy storage element and other data are collected and analyzed, an expectation value of the wind and light output power is calculated, and meanwhile the wind and light power fluctuation and the electrical charge state of the energy storage element are considered to conduct optimizing control on a mobile step size; finally, deviation between a wind and light output power actual value and the expectation value serves as the stabilizing target of the energy storage element, charging and discharging of an energy storage unit are controlled, and smoothness of the wind and light output power is achieved. On the basis that the highest power output of wind electricity and photoelectricity can be kept, by flexibly and rapidly controlling the storage battery and the super capacitor, stabilization of the wind and light power fluctuation is achieved, electricity energy quality is effectively improved, and the energy using ratio and admitting ability for renewable energy sources of a power grid are improved.

Description

technical field [0001] The invention relates to a control method for a hybrid energy storage system to stabilize wind and solar output power fluctuations, and belongs to the field of power quality. Background technique [0002] In consideration of primary energy depletion and environmental protection, the development of renewable energy is regarded as an important strategy worldwide. In recent years, the installed capacity of wind power and photovoltaics in my country has increased significantly, while the growth of grid-connected power generation has been slow. The reason is that the randomness and volatility of wind and solar energy pose a huge challenge to wind power grid-connected consumption. Adjusting distributed power itself can reduce the output fluctuation of distributed power to a certain extent, but at the same time it also reduces the effective utilization rate of renewable energy; the rapid development of energy storage technology provides a new idea for smoothi...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32H02J3/24
CPCY02E10/763Y02E70/30Y02E10/566Y02E10/563Y02E10/56Y02E10/76
Inventor 张雅超王永利李卫国陈厚合辛业春王玲
Owner STATE GRID CORP OF CHINA
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