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Method for stabilizing fluctuation of output power of renewable energy power supply in power system

A renewable energy and power system technology, applied in energy storage, climate sustainability, greenhouse gas reduction, etc. Issues such as the economic benefits of renewable energy sources

Inactive Publication Date: 2012-07-18
HEFEI UNIV OF TECH +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method of stabilizing power fluctuations is simple, it will increase the capacity constraints of battery-type energy storage devices in the control of renewable energy sources, thereby limiting the output power of renewable energy sources, and thus cannot fully exploit the potential of renewable energy sources. economic benefits

Method used

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  • Method for stabilizing fluctuation of output power of renewable energy power supply in power system
  • Method for stabilizing fluctuation of output power of renewable energy power supply in power system
  • Method for stabilizing fluctuation of output power of renewable energy power supply in power system

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Embodiment Construction

[0051] In this embodiment, the method for stabilizing the output power fluctuation of the renewable energy source in the power system is to proceed as follows:

[0052] 1. A battery-type energy storage power station connected to a power system with a specified voltage level is composed of N battery modules that operate in parallel and can be independently controlled for charging and discharging; according to the charging and discharging status of each battery module, the working status of the energy storage power station is divided into 2N+1 species: s 1 , s 2 ,...,s i 、…s 2N+1 , where s i Indicates the i-th working state of the energy storage power station, and the working state set S of the energy storage power station is composed of 2N+1 working states of the energy storage power station;

[0053] 2. Given the starting moment for the stabilization of the output power fluctuation of the renewable energy source, the stabilization period T, and the number of periods n with...

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Abstract

The invention discloses a method for stabilizing the fluctuation of the output power of a renewable energy power supply in a power system. The method comprises the following steps of: forming a battery type energy storage power station by battery modules, and dividing the operating states of the energy storage power station according to the charging / discharging condition of the battery modules; according to forecast, giving a load predicted value and a renewable energy power supply output power predicted value of each time interval in a power stabilizing period, and adding the difference value between the load predicted value and the renewable energy power supply output powder to network loss to obtain the power difference value of the power system; setting the energy constraint condition of the energy storage power station and the gross capability constraint condition and climbing constraint condition of a normal unit; and designing a dynamic programming algorithm; with the goal that the sum of the absolute value of the gross output power change value of all time intervals of a thermal power unit in the system in one stabilizing period is minimum, obtaining the optimal scheduling scheme of the energy storage power station on the premise that the constraint condition is met. The method is used for stabilizing the fluctuation of the output power of the renewable energy power supply, so that the renewable energy power supply can be used to the greatest extent.

Description

technical field [0001] The invention relates to the field of power system dispatching, and more specifically relates to a method for using a battery-type energy storage power station to stabilize output power fluctuations of renewable energy sources in a power system. Background technique [0002] The randomness of the output power of renewable energy sources such as large wind farms and photovoltaic power stations has a huge adverse effect on the reliability and stability of traditional power systems. When the penetration rate of renewable energy power in the power system is high, the climbing rate of thermal power units often cannot follow the change of the output power of renewable energy power, which makes the power system managers to connect renewable energy power A capacity limit is imposed. In order to maximize the utilization of renewable energy and reduce the capacity bottleneck of access to the grid caused by the fluctuation of the output power of renewable energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32
CPCY02E70/30
Inventor 丁明毕锐吴红斌
Owner HEFEI UNIV OF TECH
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