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An emergency load shedding method for power grid receiving end system considering static frequency and voltage characteristics

A technology of voltage characteristics and receiving end system, applied in power network operating system integration, AC network with the same frequency from different sources, power transmission AC network, etc. problem, to achieve the effect of enhanced effect

Active Publication Date: 2021-06-01
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing load model either only considers the uncertainty of the user's electricity consumption behavior, or only considers the relationship between the load and the operating state, and does not consider the combination of the two, let alone the change of the load factor caused by the change of the load component.

Method used

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  • An emergency load shedding method for power grid receiving end system considering static frequency and voltage characteristics
  • An emergency load shedding method for power grid receiving end system considering static frequency and voltage characteristics
  • An emergency load shedding method for power grid receiving end system considering static frequency and voltage characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] see Figure 1 to Figure 2 , an emergency load shedding method for receiving end systems of AC and DC power grids based on random load models considering static frequency and voltage characteristics, mainly includes the following steps:

[0110] 1) Obtain power system data, including power system node load data.

[0111] 2) Establish a random load model that takes static frequency and voltage characteristics into account.

[0112] Further, the random load model considering static frequency and voltage characteristics includes a load randomness model and a relationship model between actual load size, node voltage and system frequency.

[0113] The load in the power system has a strong randomness. On the one hand, the uncertainty of the user's power consumption behavior will directly affect the size of the load under rated conditions. Usually, the load randomness model is used to represent this kind of randomness. This kind of randomness Randomness is defined as the rand...

Embodiment 2

[0225] The emergency load shedding method of the receiving end system of the AC / DC power grid considering the random load model of the static frequency and voltage characteristics mainly includes the following steps:

[0226] 1) Obtain power system data, including power system node load data.

[0227] 2) Establish a random load model that takes static frequency and voltage characteristics into account.

[0228] 3) Solve the random load model considering the static frequency and voltage characteristics, and obtain the power flow data during normal operation of the power system.

[0229] 4) When the DC block occurs in the power system at the receiving end, the random load model considering the static frequency and voltage characteristics is solved to obtain the load shedding scheme for the DC block of the power system.

Embodiment 3

[0231] The method for emergency load shedding of the receiving end system of the AC / DC power grid taking into account the random load model of static frequency and voltage characteristics, the main steps are shown in Embodiment 2, wherein the random load model considering static frequency and voltage characteristics includes a load randomness model And the relationship model between actual load size, node voltage and system frequency.

[0232] The load randomness model is shown in formula (1) and formula (2), namely:

[0233]

[0234]

[0235] In the formula, the '~' above the variable indicates that it is a random variable. The subscript 'i' in a variable indicates that the variable is a variable on node i. and P DNi Indicates the actual active load and expected active load under rated working conditions. is the load prediction error under rated conditions. Indicates the actual reactive load under rated conditions. r Di Indicates the ratio between the expected ...

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PUM

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Abstract

The invention discloses an emergency load shedding method for a receiving end system of an AC / DC power grid considering a random load model of static frequency and voltage characteristics. The main steps are as follows: 1) Acquiring power system data. 2) Establish a random load model that takes static frequency and voltage characteristics into account; 3) Solve the random load model that takes static frequency and voltage characteristics into account to obtain power flow data during normal operation of the power system; When DC is blocked, the random load model considering the static frequency and voltage characteristics is solved to obtain the load shedding scheme of the power system when DC is blocked. The invention utilizes the load shedding scheme of the quasi-steady-state control process after DC blocking faults to obtain fast, accurate and practical deterministic results, which is the basis for safe and stable operation of power systems containing large-capacity high-voltage direct current transmission lines, and has important research and application value.

Description

technical field [0001] The invention relates to an emergency control technology of a power system, in particular to an emergency load shedding method for a receiving end system of an AC / DC power grid considering a random load model of static frequency and voltage characteristics. Background technique [0002] In recent years, my country's electricity consumption has continued to grow with the rapid development of the national economy. Looking at my country's electricity production and consumption, there is a serious spatial asymmetry in energy distribution and load demand, which requires long-distance and large-capacity electricity. delivery. UHVDC is a major way of long-distance and large-capacity power transmission. However, when a blocking fault occurs in the DC system, there will be a large power shortage in the power grid at the receiving end. During the power flow transfer process, the AC transmission channel may be overloaded, thereby causing a chain reaction. failure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14H02J3/06H02J3/36
CPCH02J3/06H02J3/14H02J3/36Y02B70/3225Y02E60/60Y04S20/222
Inventor 唐俊杰杜骁蒋营营周昕宇林星宇何映桥杨晨陈晓琳
Owner CHONGQING UNIV