Wyniki wyszukiwania - BazTech

1

Research on improving low-frequency oscillation characteristics of wind power grid-connected power system with doubly-fed wind generator based on virtual impedance power system stabilizer

He Ping, Zhu Yongliang, Li Qiuyan, Fan Jiale, Tao Yukun

Archives of Electrical Engineering

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2023

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Vol. 72, nr 3

811--828

EN

The grid integration of large-scale wind power will alter the dynamic characteristics of the original system and the power distribution among synchronous machines. Meanwhile, the interaction between wind turbines and synchronous machines will affect the damping oscillation characteristics of the system. The additional damping control of traditional synchronous generators provides an important means for wind turbines to enhance the damping characteristics of the system. To improve the low frequency oscillation characteristics of wind power grid-connected power systems, this paper adds a parallel virtual impedance link to the traditional damping controller and designs a DFIG-PSS-VI controller. In the designed controller, the turbine active power difference is chosen as the input signal based on residual analysis, and the output signal is fed back to the reactive power control loop to obtain the rotor voltage quadrature component. With DigSILENT/PowerFactory, the influence of the controller parameters is analyzed. In addition, based on different tie-line transmission powers, the impact of the controller on the low-frequency oscillation characteristics of the power system is examined through utilizing the characteristic root and time domain simulation analysis.

2

Wykorzystanie urządzeń DA-BOX 2000 do monitorowania stabilności sieci elektroenergetycznej

Małyszko O., Wiśniewski R., Zeńczak M.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2017

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Nr 56

57--62

PL

W artykule omówiono zagadnienia związane ze stabilnością sieci elektroenergetycznej, przeznaczenie i zasadę działania urządzenia DA-Box 2000 oraz wykorzystanie go do monitorowania stabilności sieci elektroenergetycznych. Doświadczenia niemieckie wskazują, że badanie stabilności sieci ma coraz większe znaczenie w praktyce z powodu gwałtownego wzrostu udziału nieliniowych źródeł i odbiorów energii w systemie elektroenergetycznym. Przyrząd DA-Box 2000, poprzez zaawanasowaną analizę napięć i częstotliwości, jest w stanie wykryć groźbę utraty stabilności przez system elektroenergetyczny spowodowany na przykład lawiną napięcia lub częstotliwości. Według danych producenta urządzenia te pracują z powodzeniem w kilkunastu krajach na całym świecie.

EN

The power system is a complex system in which, except the usual linear elements, there are more and more nonlinear and restless power generating and loading devices. This causes that even in the normal working conditions, besides the basic harmonic (50 Hz) of current and voltage there are more and more higher harmonics and subharmonic. Higher harmonic content generally refers to the quality of energy, while subharmonic, especially low frequency oscillations of several Hz or even less than 1 Hz, can be used for power system stability testing. Unfortunately, so far they are basically not used either in the power system protection or in the power system control. This paper presents issues related to the stability of the power grid, the purpose and principle of operation of the DABox 2000 and its use to monitor the stability of the power grid. German experience indicates that the study of network stability is becoming increasingly important in practice due to the rapid increase in the share of nonlinear sources and energy load in the power system. The DA-Box 2000 device, using its advanced voltage and frequency analysis, is able to detect the threat of power system failure due to, for example, a collapse of voltage or frequency. According to the manufacturer's data, these devices work successfully in over a dozen countries around the world.

3

Genetic algorithm for damping of power system oscillations

Eslami M., Shareef H., Khajehzadeh M.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 2a

219--222

EN

In this paper, Genetic algorithm (GA) optimization method is presented for optimal design of power system stabilizer (PSS). The design problem of the PSS parameters is formulated as an optimization problem and GA optimization method is used to search for optimal PSS parameters. The 2-area-4-machine power system, under a wide range of system configurations and operation conditions is investigated to illustrate the performance of the GA. The performance of the optimization method is compared with the conventional power system stabilizer. The eigenvalue analysis and non-linear simulation results are presented and compared to show the effectiveness of the GA optimization method in optimal tuning of PSS, to enhance power system stability.

PL

W artykule zaprezentowano metodę optymalizacji algorytmu stabilizacji systemu zasilania, z wykorzystaniem algorytmu genetycznego. Opracowana metoda została porównana w działaniu z konwencjonalnym stabilizatorem sieci. Przedstawiono wyniki przeprowadzonych symulacji nieliniowych i analizy wartości własnych.

4

Coordinated design of UPFC and PSS to improve power system stability

Eslami M., Shareef H., Mohamed A., Khajehzadeh M.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3a

153--158

EN

A modified particle swarm optimization is proposed and used for coordinated designing of the power system stabilizer and unified power flow controller as a damping controller in the multi-machine power system. For evaluation of the effectiveness and robustness of the proposed controllers, their performances have been tested on a weakly connected power system subjected to different disturbances. The results of these studies show that the proposed coordinated controllers have an excellent capability in damping power system inter-area oscillations and enhance greatly the dynamic stability of the power system.

PL

W artykule opisano metodę projektowania struktury sterowania układem elektrycznym wielomaszynowym, gwarantującej stabilność pracy i jednostkowy współczynnik mocy. W metodzie wykorzystano zmodyfikowaną optymalizację rojem cząstek. Analizy skuteczności i odporności polegała na poddaniu zakłóceniom systemu przy połączeniu słabym. Wyniki badań potwierdzają skuteczność proponowanego rozwiązania.

5

Calculation of interval damping ratio under uncertain load in power system

Xing J., Chen C., Wu P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2012

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Vol. 60, nr 1

151-158

EN

The problem of small-signal stability considering load uncertainty in power system is investigated. Firstly, this paper shows attempts to create a nonlinear optimization model for solving the upper and lower limits of the oscillation mode’s damping ratio under an interval load. Then, the effective successive linear programming (SLP) method is proposed to solve this problem. By using this method, the interval damping ratio and corresponding load states at its interval limits are obtained. Calculation results can be used to evaluate the influence of load variation on a certain mode and give useful information for improvement. Finally, the proposed method is validated on two test systems.