Control method for unifying self-balancing and self-smoothing of micro-grid

A control method and micro-grid technology, applied in adaptive control, power network operating system integration, general control system, etc., can solve problems such as control incoordination, regional distribution network shock, regional distribution network shock, etc., to reduce Disturbance effect, stable power output, effect of reducing adjustment force

Active Publication Date: 2012-07-25
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

However, in many micro-grid projects, the ratio of distributed power supply, energy storage and load capacity is chaotic, and the control is not coordinated. After large-scale access, large power fluctuations will have a serious impact on the regional distribution network, and even cause regional distribution networks. Shock of the power grid
In addition, domestic research on microgrid control methods is mainly concentrated within the microgri

Method used

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  • Control method for unifying self-balancing and self-smoothing of micro-grid
  • Control method for unifying self-balancing and self-smoothing of micro-grid
  • Control method for unifying self-balancing and self-smoothing of micro-grid

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Embodiment 1

[0121] In order to make the technical solution of the present invention clearer, the structure diagram of a microgrid system including wind, wind and gas storage in the embodiment provided by the present invention is as follows Figure 4 As shown, microgrid A mainly includes wind power generation, photovoltaic power generation, lithium battery packs, micro gas turbines, primary loads, secondary loads, tertiary loads, and reactive power compensation devices. Taking the microgrid A connected to the regional distribution network B as an example, the present invention will be further described in detail in combination with the accompanying drawings and the specific implementation process.

[0122] First, the energy management system of microgrid A makes short-term forecasts based on historical load data and real-time measurement data, and formulates the local load demand forecast curve P L (t); According to weather information, combined with the characteristics of wind power and p...

Embodiment 2

[0127] The invention has high applicability and can be changed and adjusted more flexibly. In order to make the technical solution of the present invention more flexible, the above-mentioned microgrid A and regional distribution network B are still taken as examples below to illustrate the embodiments:

[0128] First, the energy management system of microgrid A makes short-term forecasts based on historical load data and real-time measurement data, and formulates the local load demand forecast curve P L (t); According to weather information, combined with the characteristics of wind power and photovoltaic power generation, make short-term forecasts for wind power and photovoltaic power generation; formulate micro gas turbine power generation plan and lithium battery pack charging and discharging plan according to market time-of-use electricity price and power generation cost; finally form a micro grid Planned self-balance degree boundary curve k low (t)-k high (t) and self-s...

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Abstract

The invention relates to a control method for unifying self-balancing ad self-smoothing of micro-grid, which comprises the following steps: formulating a local load demand power prediction curve, a self-balancing degree plan curve and a self-smoothing degree limit value by a micro-grid energy managing system; judging whether the micro-grid energy managing system accept schedule of a regional distribution network scheduling system; reporting the self-balancing degree plane curve and the self-smoothing degree limit value to the regional distribution network scheduling system; formulating a self-balancing degree boundary curve and a self-smoothing degree boundary limit value by the regional distribution network scheduling system; receiving the self-balancing degree boundary curve and the self-smoothing degree boundary limit value by the micro-grid energy managing system; and processing coordination control to distributed power supply, an energy storage device and controllable load in the micro-grid by a micro-grid central controller. The method disclosed by the invention realizes the control for unifying the self-balancing and the self-smoothing of the micro-grid and reduces disturbance influence of intermittent renewable energy resource power fluctuation to accessed regional distribution network at high permeability; and high energy utilization ratio and relatively large economic benefit are acquired.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a self-balancing and self-smoothing unified control method for a microgrid. Background technique [0002] In recent years, with the deteriorating environment and the scarcity of non-renewable energy sources, distributed generation (DG) and microgrid technology have gradually attracted the attention of various countries. The distributed power supply is incorporated into the distribution network in the form of a microgrid, which can effectively control the distributed power supply, improve energy utilization, improve power supply reliability, and improve power quality. Therefore, a number of micro-grid projects have been built in China in recent years. However, in many micro-grid projects, the ratio of distributed power supply, energy storage and load capacity is chaotic, and the control is not coordinated. After large-scale access, large power fluctuations will have a ser...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/24H02J3/14H02J13/00
CPCG05B13/02H02J3/1821H02J3/381Y02E70/30H02J3/28Y02B70/3225Y04S20/224H02J13/0006Y04S20/222Y02E40/30Y04S10/12H02J2310/10H02J2300/10H02J13/00034Y02E40/70Y04S10/22H02J3/004H02J3/24
Inventor 李洋刘海涛季宇吴鸣梁惠施苏剑
Owner CHINA ELECTRIC POWER RES INST
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