Power distribution network electromagnetic optimization dynamic loss reduction method, system and synthetic loss reduction system

Abstract

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time as well as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.

Description

1. Technical field: [0001] The invention relates to a dynamic loss reduction method for a distribution network and a comprehensive loss reduction system for a distribution network, in particular to a dynamic loss reduction method for electromagnetic adjustment and balance of a distribution network and a comprehensive loss reduction system. 2. Background technology: [0002] The power industry is a big energy consumer. According to relevant data, China's power industry consumed about 1.1 billion tons of coal in 2005, accounting for more than 50% of China's coal output of 2.19 billion tons. According to preliminary estimates, in the first half of 2008, the electricity consumption per unit of GDP in the country was 1433.8 kWh / 10,000 yuan, an increase of 75.3 kwh / 10,000 yuan compared with the end of last year, an increase of 5.5%. In the first half of the year, the power industry consumed 482 million tons of raw coal for power generation, a year-on-year increase of 8.12%. It is...

AI Technical Summary

Problems solved by technology

For a long time, the problem of line loss has been a problem that plagues the power supply industry

The greater the three-phase unbalance, the greater the zero-sequence current and the greater the increase in line loss

The three-phase imbalance not only increases the loss, but also reduces the service life of the distribution transformer in serious cases, and even burns it

It is very difficult to find the unbalanced three-phase load in time and dynamically adjust the unbalanced three-phase during the operation of the distribution transformer.

[0008] 2. The rapid increase of single-phase nonlinear load equipment causes serious harmonic pollution

More and more nonlinear and impact loads are put into use, making the harmonic pollution of the power grid increasingly serious

The zero-sequence 3rd harmonic generated by non-linear electrical equipment in the distribution network will be superimposed on the neutral line, which will increase the current, cause the voltage neutral point to shift, and cause harm to the distribution system, resulting in voltage distortion and zero crossing. Noise, neutral line overheating, transformer overheating, circuit breaker malfunction and many other problems

[0009] 3. The working status of the existing reactive power compensation equipment is worrying and failed to achieve the expected effect

[0010] 4. Too many distribution transformers work in the "non-economic operation area" resulting in increased line loss

The three-phase unbalanced current caused by the unbalanced three-phase load and the zero-sequence current generated, the harmonic pollution caused by the load characteristics, the lack of reactive power and the waste of excess power in the power supply link, and the distribution transformer operating in the "non-economic Operating interval”, the statistical error caused by the time difference of line loss statistics, these factors are intertwined and affect each other, resulting in the dynamic change of technical line loss in the medium and low voltage distribution network, which is unpredictable

[0011] The arbitrariness of power consumption time, the imbalance of power consumption load and the uncertainty of power consumption load characteristics are also the reasons for the diversity of technical line loss causes, which lead to the difficulty and complexity of technical loss reduction. Relying on a single loss reduction Technology has little effect on loss reduction

Years of actual statistical data show that the "reactive power compensation device" commonly used by power supply companies to reduce the line loss rate is basically in an "abnormal" working state due to various reasons; while some voltage regulating equipment can reduce " "Excess" power waste effect, but can not achieve the governance of other factors affecting line loss

To sum up, the diversity of causes of technical line loss leads to the complexity and great difficulty of technical loss reduction

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