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Low-voltage distribution network line loss calculation method based on the influence of the imbalance of three phases on line loss

A line loss, low-voltage distribution network technology, applied in the direction of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry in polyphase networks, circuit devices, etc., can solve problems such as immaturity, large amount of calculation, and complex calculation process. , to achieve the effect of improving accuracy and good engineering practicability

Pending Publication Date: 2017-08-18
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology

A variety of simplified methods have been proposed in practical applications, such as artificial neural network theoretical calculation of line loss, but this method is not very mature in practical applications; it is suitable for the calculation method of distribution network line loss for automation devices, but this method is not suitable for automatic measurement The requirements are relatively strict, and the current situation of the domestic distribution network is that the degree of automation and accuracy of measurement is not very high; matching the concept of power flow, making full use of real-time measurement, has a certain contribution to state estimation and line loss calculation, but the load acquisition method Complicated, not easy to operate and the calculation process is complicated and the amount of calculation is large

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  • Low-voltage distribution network line loss calculation method based on the influence of the imbalance of three phases on line loss
  • Low-voltage distribution network line loss calculation method based on the influence of the imbalance of three phases on line loss
  • Low-voltage distribution network line loss calculation method based on the influence of the imbalance of three phases on line loss

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Embodiment Construction

[0038] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, a low-voltage distribution network line loss calculation method based on the influence of three-phase imbalance on line loss, the method includes the following steps:

[0040] Calculate the average load current value at the head end of the line based on the data monitored at the load end;

[0041] Calculate the equivalent resistance of the low-voltage distribution line according to the monitored electricity value of the sub-meter;

[0042] Calculate single-phase and three-phase unbalance according to the data collected in real time;

[0043] Calculate the line loss based on the above calculation results and the monitored parameters.

[0044] Introducing the concept of phase imbalance degree β

[0045]

[0046] where Ι cp is the average phase current of the three-phase loa...

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Abstract

The invention discloses a low-voltage distribution network line loss calculation method based on the influence of the imbalance of three phases on line loss. The method comprises the following steps: according to the load terminal monitored data, calculating the average load current value across the first end of the line; based on the monitored sub-meter current amount, calculating the equivalent resistance of the low-voltage distribution line; according to the data acquired in real time, calculating the imbalance degrees of the single phase and the three phases; and calculating the line loss.

Description

technical field [0001] The invention relates to a method for calculating line loss of a low-voltage distribution network, in particular to a method for calculating line loss of a low-voltage distribution network based on the influence of three-phase unbalance on line loss. Background technique [0002] The line loss rate is an important comprehensive economic index for power supply enterprises. Due to the low voltage level of the distribution network, relatively speaking, the line loss rate caused by unit transmission power is high, and the accurate calculation of the theoretical line loss is directly related to the normal operation and scheduling of the distribution network. Due to the characteristics of many distribution network nodes, many branch lines, and many components, and most components do not have the conditions to measure operating parameters, the conditions for the distribution network line loss calculation based on the power flow algorithm are very harsh. A va...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/26
CPCH02J3/00H02J3/26H02J2203/20Y02E40/50
Inventor 傅晓飞廖天明盛慧陈新纪坤华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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