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Low-frequency and low-voltage load reduction control method considering comprehensive load regulation characteristic

A low-frequency, low-voltage, comprehensive regulation technology, applied in climate sustainability, AC network voltage regulation, information technology support systems, etc.

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The literature "Research on Low-frequency Load Shedding Scheme Considering Load Frequency Characteristics" (Proceedings of the Chinese Society for Electrical Engineering, 2005, Volume 25, Issue 19) once proposed a low-frequency load-shedding control method that takes into account the frequency regulation characteristics of load active power, but this method The voltage regulation characteristics of the load and the frequency regulation characteristics of the reactive power are not taken into account; moreover, the calculation of the frequency regulation characteristics of the active power of the load requires multiple sampling periods of frequency measurement and active power measurement, and requires multiple loads Information transmission between loops is difficult to apply in actual engineering

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  • Low-frequency and low-voltage load reduction control method considering comprehensive load regulation characteristic

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Embodiment Construction

[0041] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0042] The flow process of the inventive method is as figure 1 As shown, including the following 7 steps:

[0043] Assuming that a low-frequency low-voltage load shedding control device (hereinafter referred to as "device") is installed at n load buses in the power grid, for any bus i (i=1, 2, ..., n):

[0044] 1) The device installed at load bus i measures in real time the initial voltage U of the bus under normal operating conditions 0i , initial frequency f 0i , initial active power P 0i and initial reactive power Q 0i ;

[0045] 2) The device at the load bus i detects whether there is a disturbance in the power grid or the bus frequency and voltage exceed the limit (without loss of generality, the frequency limit is lower than 49.8Hz, and the voltage limit is lower than 0.95pu), if it goes to step 3) , otherwise return to step 1);

[004...

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Abstract

The invention discloses a low-frequency and low-voltage load reduction control method considering the comprehensive load regulation characteristic, belonging to the technical field of stability control of a power system. The instantaneous load-to-ground admittance Y(t) and the sensitivity R(t) of the instantaneous load-to-ground admittance to frequency change of a corresponding bus are calculated in real time by measuring local state quantity information such as bus voltage, frequency, active power and reactive power in real time with a low-frequency and low-voltage load reduction control device which is arranged at a load bus, thereby obtaining a low-frequency and low-voltage load reduction control sensitive index S(t). Compared with the conventional low-frequency and low-voltage load reduction control method, the method has the advantages that the frequency regulation characteristic of the active power and the reactive power of the load and the comprehensive effect of the voltage regulation characteristic can be effectively considered in action logic of the device to realize the control sensitivity recognition for different load nodes, so that the load reduction control effect is improved, and the load reduction control cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, and in particular relates to a low-frequency and low-voltage load reduction control method taking into account the characteristics of comprehensive load regulation. Background technique [0002] Power system low-frequency and low-voltage load shedding control is the last line of defense for the safe and stable operation of the power grid. It is an important technical means to prevent frequency collapse or voltage collapse, or even large-scale power outages, when the power system is severely disturbed. After a sudden and extremely severe fault in the power grid leads to a large amount of active power or reactive power shortage, in order to suppress the sharp and rapid drop in frequency and voltage or the continuous low frequency and low voltage, a low frequency and low voltage load shedding control device is required. [0003] Low-frequency low-voltage load-shedding control ...

Claims

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Application Information

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IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 侯玉强李威任先成崔晓丹吕亚洲
Owner STATE GRID CORP OF CHINA
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