Power distribution network energy saving and consume reducing integrated management system based on multi intelligent body and management method thereof

Abstract

The invention discloses a comprehensive management system for conserving energy and reducing consumption of power distribution grid based on multi-agent and management method thereof, which can achieve interaction and cooperation among agents of each energy-conserving equipment and reduce the mutual influence of the energy-conserving equipments by coordinating tasks and disassembling agents. The invention can consider the overall factors causing electric energy loss of the power distribution loss and solve the coupling effect among the factors, thus simplifying the entire system and reducing the mutual influence of the energy saving equipments. According to the condition of isolated islands of power distribution network data and in the highly distributing and heterogeneous environment of each information system, the invention can achieve the interconnection, interoperation and inter-coordination of distributed operation platforms of the power distribution network in a high-efficiency manner, thus achieving full-azimuth and multi-aspect comprehensive energy conservation and consumption reduction of the power distribution network.

Description

technical field [0001] The invention relates to a power system, in particular to a multi-agent-based comprehensive management system for energy saving and consumption reduction of power distribution networks in cities and enterprises and a management method thereof. Background technique [0002] my country clearly stipulates that the energy consumption per unit of GDP at the end of the "Eleventh Five-Year Plan" period will be reduced by about 20% compared with the end of the "Tenth Five-Year Plan" period. Energy conservation has become a long-term strategic policy of my country's economic and social development, and electricity conservation is an important part of the national energy conservation strategy. According to the statistics of the forecasting department of the National Information Center, in 2005, the electric energy loss caused by harmonic and reactive power problems in my country exceeded 200 billion kWh. [0003] In recent years, due to the harmonic problem of ...

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Problems solved by technology

[0003] In recent years, due to the harmonic problem of the distribution network, the supplementary capacitor often trips and cannot be put into operation or even explodes, and the microcomputer protection device also malfunctions or even refuses to operate, causing accidents

For example, in July 1998, Hunan Lianyuan Iron and Steel Works caused a 16-hour power outage at Baonanshan 220kV substation due to the 5th harmonic exceeding the standard, resulting in economic losses of 24 million yuan; from 2001 to 2002, Guangdong Zhongjin Lingnan Co., Ltd. Due to the serious exceeding of the 2nd and 5th harmonics, high-voltage switchgear malfunctioned many times, and caused damage to motors and transformers, resulting in economic losses of 27 million yuan; in March 2006, Nanjing Power Grid activated automatic protection due to harmonics Large-scale power outages occurred in the south of the city and in the city, causing serious social impact

It can be seen that insufficient reactive power and excessive harmonics not only cause a lot of energy waste, but also seriously threaten the safe and stable operation of the power grid.

[0004] Since a single energy-saving device only has a certain aspect of energy-saving functions, such as static var compensator, which focuses on reactive power compensation and reduces the flow of reactive current in the power grid, it cannot meet the needs of society for all aspects of energy saving

Looking at the energy-saving technology of distribution network in comprehensive cities and enterprises, there are the following deficiencies: 1. The entire distribution network lacks overall planning and management means, and the level of energy management is not high, and there is no "all-round and multi-faceted" comprehensive energy-saving reduction. consumption

The energy-saving equipment in the distribution network of cities and enterprises is still in single operation, forming a situation of "isolated islands", the information is relatively scattered, the integration degree is not high, and it is not convenient for high-level management and control

2. The energy-saving equipment of a single independent node affects each other. Once the local adjustment is excessive or insufficient, it will cause the failure of the adjacent line and form a "critical area"

For example: A static var compensator SVC is applied to a node to improve the power factor and reduce the loss of electric energy; at the same time, a harmonic suppression device is used to reduce the harmonic content of the node and reduce the harmonic loss; but the SVC itself is not considered The characteristics of harmonics and the impact on harmonic suppression devices cause resonance between equipment and between equipment and the grid, which in turn causes faults in adjacent lines and forms a "critical area"

3. Independent control of energy-saving equipment can easily lead to frequent equipment adjustments, shortened service life of equipment, and increased maintenance costs

However, it does not consider the load, the harmonics of the distribution network, the adjustment cost of transformers and capacitors, and the interaction between energy-saving equipment, so it cannot realize the "all-round and multi-faceted" comprehensive energy saving and consumption reduction of the distribution network.

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