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Controlling the Rotor Angle Stability of single machine infinite bus system in the Presence of Wiener and Alpha-Stable Levy Type Power Fluctuations

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FLUCTUATION AND NOISE LETTERS 2020年第4期19卷

作者： Savaci, F. Acar Yilmaz, Serpil Izmir Inst Technol Dept Elect & Elect Engn TR-35430 Izmir Turkey

The integration of renewable energy sources into the power systems and the growth of electricity consumption leads to a considerable increase in the power fluctuations. In the first part of this study, the control of the rotor angle stability of single machine infinite bus system in the presence of Wiener type power fluctuations has been achieved by minimizing the corresponding stochastic sensitivity function. In the second part, the power fluctuations have been modeled by alpha-stable Levy processes and since stochastic sensitivity function is not available for alpha-stable Levy processes, then the control of the rotor angle stability has been numerically achieved by minimizing the corresponding rotor angle dispersion for the first time in the literature.

关键词： Alpha-stable Levy process Wiener process power fluctuations rotor angle stability single machine infinite bus system

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Calculation of the Autocorrelation Function of the Stochastic single machine infinite bus system

Calculation of the Autocorrelation Function of the Stochasti...

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North American Power Symposium

作者： Goodarz Ghanavati Paul D. H. Hines Taras Lakoba Eduardo Cotilla-Sanchez College of Engineering and Mathematical Sciences University of Vermont School of Electrical Engineering and Computer Science Oregon State University

ISBN: (纸本)9781479912537

Critical slowing down (CSD) is the phenomenon in which a system recovers more slowly from small perturbations. CSD, as evidenced by increasing signal variance and autocorrelation, has been observed in many dynamical systems approaching a critical transition, and thus can be a useful signal of proximity to transition. In this paper, we derive autocorrelation functions for the state variables of a stochastic single machine infinite bus system (SMIB). The results show that both autocorrelation and variance increase as this system approaches a saddle-node bifurcation. The autocorrelation functions help to explain why CSD can be used as an indicator of proximity to criticality in power systems revealing, for example, how nonlinearity in the SMIB system causes these signs to appear.

关键词： Autocorrelation function single machine infinite bus system Autocorrelation signal variance circuit switched data State variable useful signal DYNAMICAL systemS

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Disturbance Observer Based Adaptive Sliding Mode Control: An Application to single machine infinite bus Power system

Disturbance Observer Based Adaptive Sliding Mode Control: An...

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IEEE International Conference on Signal Processing, Informatics, Communication and Energy systems (SPICES)

作者： Sahoo, Soumya Ranjan Brisilla, R. M. Sankaranarayanan, V. Natl Inst Technol Tiruchirappalli Dept Elect & Elect Engn Tiruchirappalli India

ISBN: (纸本)9781479918232

This paper presents a disturbance observer based adaptive sliding mode controller. The switching gain of the controller is adjusted based on the estimated value of the disturbances to avoid high amplitude chattering. The main idea here is to consider the unknown disturbances in sliding function dynamics which results in a simple linear observer. The proposed technique is then applied to a single machine infinite bus(SMIB) power system. Numerical simulations are presented to validate the technique.

关键词： Sliding mode control (SMC) Adaptive control Nonlinear control Uncertain systems single machine infinite bus system Disturbance observer

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Effect of different membership functions on fuzzy power system stabilizer for synchronous machine connected to infinite bus

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INTERNATIONAL JOURNAL OF system ASSURANCE ENGINEERING AND MANAGEMENT 2017年第1期8卷 255-264页

作者： Touil, Slimane Ben Attous, Djilani Univ Med Khaider Dept Elect Engn Biskra Algeria El Oued Univ Dept Elect Engn El Oued Algeria

The effectiveness of power system stabilizer (PSS) in providing damping and improving the dynamic response is well established. In this paper focuses, the performance of single machine infinite bus is studied with fuzzy power system stabilizer (FPSS). The generator is represented by the standard K-coefficients as second order system. The mechanism to discuss the rules is described and the performance is investigated for trapezoidal, triangular and Gaussiam membership functions of input and output variables. For FPSS, speed deviation and acceleration deviation are taken as input. The system is simulated in SIMULINK environment and performance is investigated for transients due to change in input of varying magnitude.

关键词： Power system stabilizer Synchronous machine single machine infinite bus system Fuzzy logic Simulink

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Optimal controller design of a doubly-fed induction generator wind turbine system for small signal stability enhancement

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IET GENERATION TRANSMISSION & DISTRIBUTION 2010年第5期4卷 579-597页

作者： Yang, L. Yang, G. Y. Xu, Z. Dong, Z. Y. Wong, K. P. Ma, X. Tech Univ Denmark Ctr Elect Technol DK-2800 Lyngby Denmark Xi An Jiao Tong Univ Sch Elect Engn Xian 710049 Peoples R China Hong Kong Polytech Univ Dept Elect Engn Hong Kong Hong Kong Peoples R China Univ Western Australia Sch Elect Elect & Comp Engn Perth WA 6009 Australia

Multi-objective optimal controller design of a doubly-fed induction generator (DFIG) wind turbine system using differential evolution (DE) is presented. A detailed mathematical model of DFIG wind turbine with a closed-loop vector control system is developed. Based on this, objective functions addressing the steady-state stability and dynamic performance at different operating conditions are implemented to optimise the controller parameters of both the rotor and grid-side converters. A superior epsilon-constraint method and method of adaptive penalties are applied to handle the multi-objective problem and the constraint with DE, respectively. Eigenvalue analysis and time-domain simulations are performed on a single machine infinite bus system as well as a nine-bus multi-machine system with two DFIG wind turbines to illustrate the control performance of the DFIG wind turbine with the optimised controller parameters. The electric energy productions of the studied DFIG wind turbine system with and without optimised controller parameters under turbulent wind speed are also demonstrated.

关键词： Optimal control doubly-fed induction generator wind turbine system Control of electric power systems closed loop systems grid-side converters single machine infinite bus system differential evolution Optimisation techniques constraint handling asynchronous generators DFIG wind turbine optimal control time-domain synthesis small signal stability enhancement controller parameters superior ɛ-constraint method power generation control Wind power plants Algebra Control system analysis and synthesis methods eigenvalues and eigenfunctions rotors wind turbines nine-bus multimachine system Stability in control theory eigenvalue analysis control system synthesis electric energy Asynchronous machines stability multi-objective optimal controller design closed-loop vector control system time-domain simulations rotor converters steady-state stability

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Improved coordinated control for thyristor controlled series compensation and generator excitation

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IET ELECTRIC POWER APPLICATIONS 2022年第7期16卷 805-815页

作者： Li, Jian Zhao, Zhengnan Su, Qingyu Northeast Elect Power Univ Sch Automat Engn 169 ChangChun Rd Jilin 132012 Jilin Peoples R China Jilin Prov Key Lab Adv Control Technol Smart Ener Jilin Jilin Peoples R China

This article improves the coordinated passivation control strategy of a single machine infinite bus system with generator excitation and thyristor controlled series compensation. First, in the traditional coordinated passivation control strategy, class - kappa functions and an integral term are introduced to improve the convergence speed and reduce the steady-state error of the system. Furthermore, an adaptive control method based on sliding mode is used to design adaptive laws for uncertain parameters and external disturbances and simplify the controller form. Finally, the simulation results show that compared with the traditional coordinated passivation method, the proposed controller has stronger robust adaptability and improves the convergence rate and transient performance of the system.

关键词： generator excitation coordinated passivation control control system synthesis thyristor controlled series compensation machine control adaptive control robust control steady-state error single machine infinite bus system sliding mode control adaptive control method electric generators improved coordinated control variable structure systems thyristor applications robust adaptability

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Improvement of power system transient stability by coordinated operation of fast valving and braking resistor

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IEE PROCEEDINGS-GENERATION TRANSMISSION AND DISTRIBUTION 2003年第3期150卷 311-316页

作者： Patel, R Bhatti, TS Kothari, DP Indian Inst Technol Ctr Energy Studies New Delhi 110016 India

Fast valving and braking resistors, individually, are an effective means of improving the stability of a power system under large and sudden disturbances. The fast valving schemes, like other methods, are not always suitable for all power systems for enhancing the transient stability. Minor variations in the switching parameters of the fast valving scheme drastically affect the stability of the system. Moreover, there are some other associated problems such as risk of safety valve operation owing to increased boiler pressure, the problem of second swing instability etc. Similarly the dynamic braking resistor has its own limitations such as excessive heat loss and the resultant temperature rise of the resistor. Therefore, coordinated fast valving and braking resistor control is proposed. The coordinated control scheme is very effective in reducing the mismatch between the mechanical input power and electrical power output of the generator, thereby reducing the generator accelerating power during the fault period. This dual control from load side and generation side substantially improves the transient stability performance of the system. Various schemes of fast valving control and coordinated control operation were tested on a single machine infinite bus system and the results are compared.

关键词： braking resistor control power system transient stability resistors braking sudden disturbances second swing instability generator accelerating power braking resistor dynamic braking resistor valves dual control coordinated operation boilers coordinated fast valving temperature rise Resistors switching parameters Health and safety aspects safety valve operation risk excessive heat loss safety Control of electric power systems power system faults boiler pressure increase power system control coordinated control scheme transient stability Plant engineering, maintenance and safety single machine infinite bus system Stability in control theory fast valving Power system control

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Improved adaptive backstepping sliding mode control for generator steam valves of non-linear power systems

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IET CONTROL THEORY AND APPLICATIONS 2017年第9期11卷 1414-1419页

作者： Su, Qingyu Quan, Wanzhen Cai, Guowei Li, Jian Northeast Elect Power Univ Jilin 132012 Jilin Peoples R China

The stability problem of steam valves in a single machine infinite bus system with thyristor controlled series compensation is addressed through the use of an improved adaptive backstepping method based on error compensation. The method combines sliding mode variable structure control, backstepping control and adaptive control. Initially, an excitation control input and error compensation are simultaneously obtained in the design of virtual control by adaptive backstepping and the Lyapunov method. The Lyapunov function is then constituted in stages to achieve subsystem stability, before obtaining a parameter updating law and a non-linear control law for the closed-loop system. The results for both systems show that the improved non-linear backstepping sliding mode variable structure control approach can have four benefits. It can ensure that the system states are bounded, retain the faster stability of power systems, improve the speed of parameter identification and achieve real-time parameter estimation. Finally, a simulation is presented to illustrate both the effectiveness and the feasibility of the improved control approach.

关键词： steam power stations power generation control adaptive control control nonlinearities variable structure systems nonlinear control systems Lyapunov methods power system stability closed loop systems control system synthesis error compensation thyristor applications electric generators improved adaptive backstepping sliding mode control generator steam valves nonlinear power systems stability problem single machine infinite bus system thyristor controlled series compensation error compensation sliding mode variable structure control excitation control input virtual control design Lyapunov function parameter updating law nonlinear control law closed-loop system improved nonlinear backstepping sliding mode variable structure control approach parameter identification speed real-time parameter estimation

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Prediction and control of transient stability using system integrity protection schemes

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IET GENERATION TRANSMISSION & DISTRIBUTION 2019年第8期13卷 1247-1254页

作者： Das, Sayari Panigrahi, Bijaya Ketan Indian Inst Technol Delhi Dept Elect Engn New Delhi India

Prediction of the transient stability in real-time can be a boon in preventing the occurrence of catastrophic events in a particular area that could potentially affect the entire grid and cause blackouts. Synchronised voltage angle measurements procured from the installed phasor measurement units in the network have been used to devise an index for assessment of transient stability in the system. The behaviour of the trend of the acceleration at the instant of the critical clearing angle has been used in this study as the basis for differentiating between a stable and an unstable power swing. Upon detection of an unstable condition, the generator, which is most likely to be going out of step is detected, and appropriate control action is suggested for mitigating the predicted out of step condition. Moreover, the distance relay maloperations caused during a stable power swing can also be a reason for triggering cascading outages. Suitable remedial measures to avoid such maloperations of the distance relay have been proposed. The efficacy of the proposed philosophy has been tested on a single machine infinite bus system, WSCC-9 bus system and New England 39 bus system modelled in Power Factory/DIgSILENT.

关键词： phasor measurement power system protection power system transient stability power grids voltage measurement angular measurement power generation control electric generators power generation reliability single machine infinite bus system WSCC-9 bus system New England 39 bus system system integrity protection schemes synchronised voltage angle measurements transient stability control phasor measurement units transient stability prediction power blackouts power grid distance relay maloperations triggering cascading outages Power Factory-DIgSILENT power swing

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Perturbation estimation based nonlinear adaptive control of VSC flexible excitation system

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IET GENERATION TRANSMISSION & DISTRIBUTION 2022年第13期16卷 2600-2611页

作者： Yang, Ning Zeng, Qi Yin, Xin Wang, Weiyu Zeng, Pingliang Jiang, Lin Univ Liverpool Dept Elect Engn & Elect Liverpool L69 3GJ Merseyside England Changsha Univ Sci & Technol Sch Elect & Informat Engn Changsha Peoples R China Hangzhou Dianzi Univ Sch Automat Hangzhou Peoples R China

A new type of flexible excitation system (FES) is proposed by using fully-controlled power electronic devices such as IGBTs to replace the half controlled devices in the conventional static excitation system, which has the merit of independent control of rotor angle and terminal voltage of the synchronous generator. This paper proposes nonlinear adaptive control (NAC) strategies for synchronous generator with FES in a single machine infinite bus system. External disturbances and the uncertainties of all parameters as well as modelling are defined as lumped perturbation terms and estimated by perturbation observers or state and perturbation observer. The estimated perturbation terms are used to compensate the real perturbations and achieve a model-independent and robust NAC. Merits of the FES against the conventional static excitation system and effectiveness of the proposed NAC scheme against the accurate model based multi-variable feedback linearisation control are verified via small-signal stability analysis and simulation studies. The simulation results have shown that the proposed NAC can achieve superior control performance with less states feedback during a three-phase short circuit and better robustness against parameter uncertainties, compared with linear control and multi-variable feedback linearisation control.

关键词： fully-controlled power electronic devices power system stability state feedback single machine infinite bus system robust NAC external disturbances accurate model based multivariable feedback linearisation control lumped perturbation terms nonlinear control systems power electronics FES perturbation observers linearisation techniques nonlinear adaptive control strategies three-phase short circuit robust control linear control static excitation system control system synthesis small-signal stability analysis VSC flexible excitation system parameter uncertainties synchronous generators multivariable control systems synchronous generator perturbation estimation adaptive control

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