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Load model building method of considering load frequency characteristics

A frequency characteristic and load model technology, applied in special data processing applications, AC network circuits, instruments, etc., can solve problems such as difficult load modeling and small system frequency changes

Active Publication Date: 2016-03-23
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

In the past, the object of modeling was a large-scale interconnected power grid, and the system frequency change was small, so it was difficult to carry out load modeling taking into account the load frequency characteristics and voltage characteristics at the same time

Method used

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  • Load model building method of considering load frequency characteristics
  • Load model building method of considering load frequency characteristics
  • Load model building method of considering load frequency characteristics

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Experimental program
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Embodiment

[0112] build as figure 2 The actual equivalent system shown adopts a three-level voltage system, namely 220kV, 110kV, and 10.5kV voltage systems, and the infinite equivalent AC system uses 220kV line L2 to step down 220kV / 110kV step-down transformer (T1, transformer T2). The voltage is 110kV. The 110kV voltage system is connected to different load switching elements through four 110kV / 10.5kV distribution transformers (B3, B4, B5, B6). K1, K2, K3, and K4 are load switching elements.

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Abstract

The invention provides a load model building method of considering load frequency characteristics. The method comprises the following steps: obtaining a frequency characteristic curve of a load component; calculating an active power-frequency characteristic coefficient and a reactive power-frequency characteristic coefficient of the load component; dividing the load component into a static load and a dynamic load according to the load characteristic; calculating the active power-frequency characteristic coefficient and the reactive power-frequency characteristic coefficient of the static load; calculating the active power-frequency characteristic coefficient and the reactive power-frequency characteristic coefficient of a load node; and determining a mechanical torque coefficient of an asynchronous motor of the load node. According to the load model building method, the defect that a traditional load model cannot accurately describe the load frequency characteristics is overcome; the simulating calculation credibility of a power system is improved; and a forceful guarantee is provided for scientific planning and safe and stable operation of the power system.

Description

technical field [0001] The invention relates to power system simulation technology, in particular to a load model construction method considering load frequency characteristics. Background technique [0002] With the improvement of the interconnection degree of the power system, the dynamic characteristics of the power grid under faults become more and more complex. A comprehensive understanding of its characteristics. Because on the one hand, the requirements of the power grid itself determine that it is impossible to conduct experiments in the actual power grid to study the stability of the system. It is possible to conduct research on the stability of the grid in real systems. In this case, simulation becomes an indispensable tool for power grid operation, planning and design. [0003] In the actual operating power system, the frequency dynamic process curve can be obtained through actual measurement, but sometimes there is a big difference between the system simulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/50
Inventor 王琦赵兵汤涌易俊刘丽平王建明张健郭强卜广全杨钊
Owner CHINA ELECTRIC POWER RES INST
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