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Closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over voltage

A technology of frequency deviation and feedback control, applied in the direction of single network parallel feeding arrangement, etc., to achieve the effect of maintaining frequency stability, good promotion value and application prospect, and quickly and effectively adjusting load power

Active Publication Date: 2013-12-18
WUHAN UNIV +1
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Problems solved by technology

The load is hardly affected by the system frequency and does not have the primary frequency modulation characteristics of conventional loads, but has a strong coupling relationship with the voltage of the load bus

Method used

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  • Closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over voltage
  • Closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over voltage
  • Closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over voltage

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Embodiment

[0039] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] 1. Calculate the voltage sensitivity matrix and electrical distance matrix of the system

[0041]1. The sensitivity matrix is ​​derived on the basis of the power flow equation of the power system. It is not a simple combination of the sensitivities of each node in the system. It is actually an improvement and deformation of the Jacobian matrix. The properties of the sensitivity matrix can be used to study power Many practical problems in the systems domain. Generally, the power flow equation of a power system can be simply expressed as:

[0042] f(x,u)=0 (1)

[0043] Where x is the state variable and u is the control variable. When the system operates stably in a certain operating mode, the power flow equation of the system can be expressed as:

[0044] f(x 0 ,u 0 )=0 (2)

[0045] Among them, (x 0 ,u 0 ) represent...

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Abstract

The invention relates to a closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over voltage, and an obtaining method of an optimal feedback gain parameter in the closed-loop control method. According to the closed-loop control method for achieving active power adjustment by introducing the frequency deviation feedback to have control over the voltage, due to the facts that an isolated power grid has the characteristics that the active power adjustment capacity is not sufficient, and a special load characteristic of a rectification load exists, the load power is adjusted through a method for adjusting voltage of a load bus, and the frequency deviation is introduced into an excitation regulator to serve as feedback input, a voltage closed-loop control method based on frequency information is achieved. Unbalanced power which exists after a system fault happens is distinguished through a WAMS system in an on-line mode, and a WAMS voltage closed-loop control optimal feedback gain parameter is calculated in an on-line mode on the basis of the load characteristic and a voltage sensitivity method and in the mode that the primary frequency adjustment capacity of a generating unit is taken into account. The effectiveness of the obtaining method of the optimal feedback gain parameter and the effectiveness of the closed-loop control method for achieving active power adjustment by introducing frequency deviation feedback to have control over the voltage are verified through RTDS simulation.

Description

technical field [0001] The invention relates to a closed-loop control method, in particular to a closed-loop control method for introducing frequency deviation feedback control voltage to realize active power regulation. Background technique [0002] The energy center and the load center show serious reverse distribution, the main performance is that most of the energy resources are distributed in the northwest, while more than 70% of the energy demand is concentrated in the east and middle. The traditional solution is to solve the problem through ultra-high voltage and ultra-high voltage long-distance transmission. In fact, it is an extremely effective solution to rely on the establishment of a microgrid to consume locally in the power center through high energy-consuming industries. [0003] System island operation can bring huge economic benefits to enterprises, but it also brings severe challenges to the safe and stable operation of the system. The traditional large po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48
Inventor 孙元章徐箭李晓民廖思阳刘明胜谷俊和刘建平董建勋许超周密
Owner WUHAN UNIV
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