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Method and system for stabilizing power fluctuations of microgrid

A power fluctuation and micro-grid technology, which is applied in the electric power field, can solve the problems of smoothing the power fluctuation of the micro-grid and the inability to accurately predict the charging and discharging energy of the hybrid energy storage system, so as to achieve the effect of stabilizing power fluctuations

Inactive Publication Date: 2017-09-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current hybrid energy storage system fails to fully consider the real-time update of the state of charge of the lithium battery, resulting in the inability to accurately predict the actual charge and discharge energy of the hybrid energy storage system, and thus unable to accurately and effectively stabilize the power fluctuations in the microgrid

Method used

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  • Method and system for stabilizing power fluctuations of microgrid
  • Method and system for stabilizing power fluctuations of microgrid
  • Method and system for stabilizing power fluctuations of microgrid

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Embodiment 1

[0063] figure 1 It is a schematic flowchart of a method for smoothing microgrid power fluctuations according to an embodiment of the present invention, as shown in figure 1 As shown, the method for suppressing microgrid power fluctuations provided by the present invention specifically includes the following steps:

[0064] Step 101: Obtain distributed renewable energy generation power and connection line node power;

[0065] Step 102: Obtain the charging and discharging time of each battery and the charging and discharging current of each battery;

[0066] Step 103: Obtain the compensation amount of battery charge; the compensation amount includes efficiency compensation amount and self-discharge compensation amount;

[0067] Step 104: Calculate the charge amount of each battery at the current moment according to the charge and discharge time, the charge and discharge current, and the compensation amount;

[0068] Step 105: Calculate the actual output / input power of each ba...

Embodiment 2

[0105] image 3 The structural diagram of the method for smoothing microgrid power fluctuations, such as image 3 As shown, the method for stabilizing microgrid power fluctuations provided by the embodiment of the present invention includes an hour integration link 301, a self-learning compensation link 302, a self-learning calculation link 303, a smoothing control link 304, a low-pass filter link 305, and a hybrid energy storage System input and output link 306 . in, image 3 P in DG Represents the active power signal of distributed generation, τ represents the time constant, P DG_ref Indicates the output signal of the distributed generation active power signal after passing through the low-pass filter; P HESS_ref Indicates the active power signal of the input and output of the hybrid energy storage system.

[0106] The ampere-hour integration link 301 is used to accumulate current and load action time, calculate the capacity consumed during battery use, and is connected...

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Abstract

The invention discloses a method and system for stabilizing power fluctuations of a microgrid. The method comprises the steps of firstly acquiring the distributed renewable energy generation power, the connecting line node power, the charging and discharging time of each battery, the charging current of each battery and the battery charge quantity compensation amount; then calculating the charge quantity of each battery at the current moment according to the charging and discharging time, the charging current and the compensation amount; then calculating the output / input power of each battery and the output / input power of a supercapacitor according to the charge quantity of each battery at the current moment, the connecting line node power and the distributed renewable energy generation power, and thus determining the actual output / input power of a hybrid energy storage system. By adopting the method or system provided by the invention, the charge quantity of lithium batteries in the hybrid energy storage system can be acquired in real time, the actual charging and discharging energy of the hybrid energy storage system is accurately predicted, and thus the power fluctuations in the microgrid are stabilized accurately and effectively.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and system for smoothing microgrid power fluctuations. Background technique [0002] Microgrid, also known as microgrid, refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. The tie line refers to a special wire that acts as a connection between the power plant (power generation and distribution system) and the grid, that is to say, through it, the electric energy generated by the power plant (power generation and distribution system) can be transmitted to the grid, and it can also be connected to the power grid. The electrical energy on the grid is transmitted back to the power plant (power generation and distribution system). [0003] With the development of new energy technologies, a large number of distributed renewable energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/32H02J3/38
CPCY02E70/30H02J3/24H02J3/32H02J3/382
Inventor 夏向阳彭梦妮蔡洁李明德王恺黄海杨明圣
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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