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Quantization-based wide-area power system output feedback control method

A technology of power system and control method, which is applied in the direction of information technology support system, electrical components, circuit devices, etc., and can solve problems such as communication channel congestion and insufficient database storage space

Active Publication Date: 2013-11-27
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of communication channel congestion and insufficient database storage space in the wide-area measurement power system

Method used

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  • Quantization-based wide-area power system output feedback control method
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  • Quantization-based wide-area power system output feedback control method

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Embodiment

[0095] The present invention takes Kundur's four-machine two-area power system as an example, and verifies the proposed control algorithm in Simulink. The four-machine two-area system structure diagram is as follows figure 2 shown.

[0096] The system includes two similar areas, each area contains two coupled units, the rated power of each unit is 900MVA, the rated voltage is 20KV, the damping coefficient D of the motor is 0, and the main parameters of each motor are as follows :

[0097] x d =1.8X q =1.7X l =0.2 X' d =0.3

[0098] x q '=0.55X d ''=0.25X q ''=0.25 R a =0.0025

[0099] T d ' 0 =8.0s T q ' 0 =0.4s T d '' 0 =0.03s T'' q0 =0.05s

[0100] h G1 =6.5H G2 =6.5H G3 =6.175H G4 =6.175

[0101] The rated power of the transformer is 900MVA, the transformation level is 20KV / 230KV, and the impedance per unit value is 0+j0.15. The rated voltage of the transmission line is 230KV. Under the reference value of 100MVA and 230KV, the per unit value of the ...

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Abstract

A quantization-based wide-area power system output feedback control method comprises the following steps that: 1) the information acquisition is finished through a PMU in a wide area measurement system, the PMU measures a power system state quantity at a fixed sampling period, and establishes a closed loop power system discretized state space model by taking T as the sampling period; 2) all states of the system are difficult to be measured in a real system; 3) and the obtained power system model is subjected to stability analysis by adopting a Lyapunov stability theory and a linear matrix inequality method, so that an inequality (15) is satisfied, and controller gains are designed for analysis validation. The quantization-based wide-area power system output feedback control method can ensure the stability of the power system with a quantizer, effectively alleviates the communication network congestion, reduces the construction costs of a communication network, saves storage space of a data storage center, is conducive to the expansion of the system, and increases the economic benefit.

Description

technical field [0001] The invention relates to the field of wide-area power system control, in particular to a quantitative-based wide-area power system output feedback control method. Background technique [0002] With the expansion of the grid scale and the adoption of various new transmission technologies, the grid structure becomes increasingly complex, and the dynamic behavior of the power system becomes more complex. In recent years, frequent power grid accidents at home and abroad have caused many blackouts, and the stability analysis and control of power systems have become a hot topic in current research. [0003] The emergence of Wide-Area Measure System (WAMS) provides a new opportunity for stability analysis and control of wide-area power systems. WAMS is a system based on the synchrophasor measurement unit (Phase Measurement Unit, PMU) and modern communication technology, which monitors and analyzes the operating status of the power system in a wide area, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 俞立白丽叶刘安东张文安孙辉凌荣耀
Owner ZHEJIANG UNIV OF TECH
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