Micro-grid operation method for stabilizing fluctuation of wind and light power by energy storing device

An energy storage device and power fluctuation technology, applied in the field of smart microgrid, can solve the problems of output power fluctuation, affecting the stable operation of microgrid, random intermittence, etc., and achieve the effect of stabilizing power fluctuation

Inactive Publication Date: 2014-08-06
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the output power of the existing micro-grid wind power generation and photovoltaic power generation units has volatility, randomness

Method used

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  • Micro-grid operation method for stabilizing fluctuation of wind and light power by energy storing device
  • Micro-grid operation method for stabilizing fluctuation of wind and light power by energy storing device
  • Micro-grid operation method for stabilizing fluctuation of wind and light power by energy storing device

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specific Embodiment approach 1

[0016] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the microgrid operation method using energy storage devices to stabilize wind and solar power fluctuations described in this embodiment, the specific process of this method is:

[0017] Step 1. Determine the structural parameters and operating parameters of the microgrid according to the microgrid system;

[0018] Step 2: Select the active output of each distributed power source in the microgrid system and the power of the microgrid to purchase and sell electricity from the large grid as control variables, obtain the operating cost function of the microgrid according to the control variables, and use the operating cost function as the operating cost of the microgrid the objective function;

[0019] Step 3. According to the objective function obtained in step 2, obtain the mathematical model of the energy storage device for smoothing the fluctuation of wind and rain;

[0020]...

specific Embodiment approach 2

[0022] Specific implementation mode 2: This implementation mode further explains the implementation mode 1. The operating cost of the microgrid described in step 2 includes fuel costs, pollution discharge costs, operation and maintenance costs, and large power grid purchase and sale costs. The operating cost is expressed as an objective function as :

[0023] F = Σ T = 1 M [ Σ i = 1 N ( C OP ( P Gi ) + C ES ( P Gi ) + C OM ...

specific Embodiment approach 3

[0025] Specific implementation mode three: this implementation mode further explains implementation mode one, and the mathematical model of the energy storage device obtained according to the objective function in step three is:

[0026] | P py ( t ) - P py ( t - 1 ) | ≤ S · λ

[0027] P ess (t)=P py (t)-P max (t)

[0028] Where: P py (t) represents the output power after being stabilized at time t; P py (t-1) indicates the output power of wind power after being stabilized at time t-1; P max (t) represents the maximum output power output at time t; P ess (t) represents the charging and discharging power of the energy storage device; S stands for

[0029] Indicates the installed capacity; λ indicates the m...

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Abstract

The invention relates to a micro-grid operation method for stabilizing the fluctuation of wind and light power by an energy storing device, belongs to the technical field of intelligent micro-grids, and aims to solve the problems that the output power with fluctuation, randomness and intermittence of wind power generation units and photovoltaic power generation units of a current micro-grid influences the stable operation of the micro-grid. The micro-grid operation method specifically comprises the following steps: determining structure parameters and operation parameters of a micro-grid according to a micro-grid system; selecting active output of each distributive power supply and power of electricity bought from or sold to a large power grid of the micro-grid as control variables, and obtaining an operation cost function of the micro-grid according to the control variables, wherein the operation cost function is taken as a target function of operation of the micro-grid; obtaining a mathematic model of the energy storing device for stabilizing the fluctuation of wind and light power and a constraint condition of operation of the micro-grid according to the target function; and obtaining a micro-grid operation method adopted after the fluctuation of power is stabilized by an improved differential evolutionary algorithm. The micro-grid operation method is applied to the micro-grid system.

Description

technical field [0001] The invention belongs to the technical field of smart microgrid. Background technique [0002] With the rapid development of human society, the demand for energy is increasing, and the requirements for the quality of the living environment are continuously improving. Microgrids containing composite new energy have attracted more and more attention. The new distributed power generation can make full use of the power generation advantages of renewable energy. However, there is a big difference between the new distributed power generation and the traditional power generation. The ability of power grid system to withstand disturbance is relatively weak. In order to make full use of the power generation advantages of the new distributed power generation, weaken the impact of its power fluctuations on the microgrid, and maintain system stability, the microgrid system must contain a certain capacity of synchronous power generation units or energy storage dev...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/38
CPCY02E10/763Y02E10/766Y02E70/30Y02E10/563Y02E10/566Y02E10/56Y02E10/76Y02P80/14
Inventor 任强陈继开李国庆张慧杰辛业春
Owner STATE GRID CORP OF CHINA
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