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Interconnected power system small signal stability of decentralized coordinated control strategy

Author: HuYunDong
Tutor: WangXiTian
School: Shanghai Jiaotong University
Course: Proceedings of the
Keywords: Interconnection Small signal stability Decentralized coordinated control Equivalent modal control Inverse system compensation Multiband
CLC: TM712
Type: Master's thesis
Year: 2012
Downloads: 105
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Abstract


China's primary energy distribution and uneven economic development determines the grid development is the inevitable trend of \With the interconnected grid spanned the growing scale, the objective of the power system reliability and stability put forward higher requirements. In high power load growth, our power grid network structure is relatively weak, and therefore lead to some of the dynamic stability, low frequency oscillation problem is one of the most important issues. This paper introduces the small signal stability of the power system on the basis of the status quo for the current characteristics of the actual power systems, focusing on the grid frequency oscillation characteristics analysis and methods of suppression. Its main contents include the following aspects: (1) using the eigenvalue analysis method of Canay motor model and its parameters for small signal stability calculation results. Complete electrical synchronous motor according to established a small perturbation equations linearized model, Phillips-Heffron six factor model and consider the role of twelve amortisseur coefficient model, based on the degradation of the model were analyzed. Studied Canay motor model and the traditional model of small interfering motor stability. The results show that, Canay motor model and the traditional motor model in the analysis of small perturbations, there are some differences, especially in light load operation of the motor case, the difference is more obvious. In order to obtain accurate conclusions, recommendations in the small signal stability analysis, using Canay motor model. (2) for small signal stability modal parameter identification method for the study proposes a method based on EMD and Prony subsynchronous torsional modal parameter identification method. EMD combined with spatial and temporal filtering characteristics and torsional vibration spectral characteristics of the test signal from the torsional vibration test signal to extract sub-synchronous TORSIONALS, and then through Prony algorithm sub-synchronous torsional vibration modal parameters. In addition, re-sampling processing to improve the sub-synchronous torsional vibration modal parameters identification accuracy. Finally, given a torsional vibration test signal and the measured signal on the proposed approach for application verification. (3) presents a comprehensive equivalent modal control, inverse system compensation and sub-band LFO achieve decentralized coordinated control strategy. First, according to the idea of ??separation control mode presents a low-frequency oscillation equivalent modal control, which controlled low frequency oscillation modes and residual modes can affect each other; then proposed inverse system compensator to compensate the dynamic characteristics of the actuator ; and additional excitation control and speed control attached to the concept of integration of multi-band, low frequency band modal control to speed control system actuators, high band excitation system modal control to the actuator, so as to achieve low frequency oscillation mode colloidal dispersion effect of coordinated control; final machine 2 through 4 regional system eigenvalue analysis numerical example to verify the effectiveness of the control strategy.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Power system stabilizer
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