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

A distribution network and loss reduction technology, applied in the direction of system integration technology, information technology support system, multi-phase network asymmetry reduction, etc., can solve the problem of increasing loss, failing to achieve the expected effect, and little loss reduction effect, etc. question

Inactive Publication Date: 2011-05-04
王磊
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment 1

[0069] Embodiment 1: This embodiment is an implementation of the method for dynamic loss reduction of electromagnetic balancing in the distribution network. The electromagnetic balancing unit is connected in series at the output end of the secondary side of the distribution transformer. The electromagnetic balancing unit here includes a jumper , A three-phase winding unit mixed and wound on three sets of magnetic columns made of silicon steel or silicon steel sheets laminated. Each phase of the three-phase winding unit contains a certain number of coils wound in series on two adjacent magnetic columns The coil on the two adjacent magnetic columns, one is the main body magnetic column, and the other is the jumper magnetic column. The coil on the main body magnetic column is wound in a clockwise direction, and the coil on the bridged magnetic column is wound in a counterclockwise direction. , the number of coil turns is calculated according to the requirements of the loss reducti...

Embodiment 2

[0072] Embodiment 2: The method for dynamic loss reduction of distribution network electromagnetic balancing in this embodiment adds a capacitor compensation unit on the basis of Embodiment 1. By connecting the capacitor compensation unit in parallel in the three-phase circuit at the output end of the secondary side of the distribution transformer, according to the detected power factor, reactive power, voltage, and capacitance value parameters, when the power factor is not in the range of 0.85 to 0.95, When the voltage does not exceed the preset value (can be set to +7% or -10% of the rated voltage of the transformer), and the required reactive power is greater than the capacitance of the proposed capacitor, the corresponding capacitor is input through the compensation control switch To the power grid to compensate for the lack of reactive power and improve the power factor; when the voltage exceeds the preset value or the power factor is greater than the upper limit of 0.95, ...

Embodiment 3

[0073] Embodiment three: see figure 1 , figure 2 . In this embodiment, the dynamic loss reduction system for distribution network electromagnetic regulation and balancing includes a comprehensive loss reduction device 1 connected in series in the output circuit on the secondary side of the distribution transformer. The comprehensive loss reduction device 1 includes a comprehensive loss reduction controller 11, an electromagnetic balancer Unit 12, wherein the electromagnetic balancing control output interface 1121 of the comprehensive loss reduction controller 11 is connected to the electromagnetic balancing unit 12 through the balancing control interface 141, and the input terminal 121 of the electromagnetic balancing unit 12 is connected to the three terminals on the secondary side of the distribution transformer. The phase output terminal, the output terminal 122 of the electromagnetic balancing unit 12 is connected with the electric load; the comprehensive loss reduction d...

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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 aswell 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/18H02J13/00
CPCY02E40/30Y02E40/50Y02E40/70Y04S10/22Y04S10/50
Inventor 王磊
Owner 王磊
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