On the Analysis of Electric Power System Aperiodic Steady-State Stability Limits

2017 ◽  
pp. 18-21
Author(s):  
Pavel Vladimirovich LEGKOKONETS ◽  
Keyword(s):  
Steady State ◽  
Power System ◽  
Electric Power ◽  
Electric Power System ◽  
Stability Limits ◽  
Steady State Stability

scholarly journals Aperiodic steady-state stability criterion of electric power system with controlled series compensation on 200 kV line

Vestnik IGEU ◽  
2020 ◽  
pp. 14-24
Author(s):  
V.P. Golov ◽  
A.V. Kalutskov ◽  
D.N. Kormilitsyn ◽  
O.S. Sukhanova
Keyword(s):  
Steady State ◽  
Power System ◽  
Electric Power ◽  
Transmission Lines ◽  
Power Transmission ◽  
Electric Power System ◽  
Transmission Capacity ◽  
Power Transmission Lines ◽  
Series Compensation ◽  
Steady State Stability

Currently there is a need to synchronize operation of the electric power system in the remote areas and increase of existing lines transmission capacity. The construction of new power transmission lines involves high economic expenditures. Well-known papers consider the issues of application of controlled series compensation devices only for long-distance power transmission lines with voltage of 500 kV and higher to increase the transmission capacity and the level of stability. The aim of the study is to increase the stability and the limit of the transmitted power when controlled series compensation devices are installed on 220 kV lines. It is necessary to develop a criterion of aperiodic steady-state stability of an electric power system with a 220 kV-controlled power transmission line. Methods of mathematical modeling of electric power system, the theory of long-distance power transmission lines and electromechanical transients, and methods of analyzing electric power system stability were used. A.M. Lyapunov’s first approximation method was used to develop a simplified mathematical model. We applied the developed software as a simulation tool. An analysis was carried out to study the influence of series compensation devices regulation coefficients on the aperiodic steady-state stability of the electric power system and the transmission capacity of 220 kV power transmission lines. A change in the modulus of voltage drop at the power transmission and the angle characteristics under the influence of the regulation coefficients of the series compensation device was revealed. A criterion of aperiodic steady-state stability has been developed for systems of this kind with controlled series compensation. It differs from traditional ones by considering the changes in the voltage drop in the power transmission and it allows more accurate estimation of the proximity to the stability threshold. An assessment of aperiodic steady-state stability according to the formulated criterion for an electric power system with a controlled series compensation device on a 220 kV line was obtained. The values of the control coefficients of the series compensation device have been determined. No violation of the steady-state stability occurs under the given values. The results can be used to solve the issues of increasing the transmission capacity of transmission lines to improve the stability of the system.

scholarly journals STUDY OF TRANSIENT AND STATIONARY OPERATION MODES OF SYNCHRONOUS SYSTEM CONSISTING IN TWO MACHINES

2017 ◽  
Vol 60 (3) ◽  
pp. 228-236
Author(s):  
V. S. Safaryan
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Power System ◽  
Mathematical Models ◽  
Coordinate System ◽  
Electric Power ◽  
Electric Power System ◽  
Machine System ◽  
Transient Regimes ◽  
The Mathematical Model

The solution of the problem of reliable functioning of an electric power system (EPS) in steady-state and transient regimes, prevention of EPS transition into asynchronous regime, maintenance and restoration of stability of post-emergency processes is based on formation and realization of mathematical models of an EPS processes. During the functioning of electric power system in asynchronous regime, besides the main frequencies, the currents and voltages include harmonic components, the frequencies of which are multiple of the difference of main frequencies. At the two-frequency asynchronous regime the electric power system is being made equivalent in a form of a two-machine system, functioning for a generalized load. In the article mathematical models of transient process of a two-machine system in natural form and in d–q coordinate system are presented. The mathematical model of two-machine system is considered in case of two windings of excitement at the rotors. Also, in the article varieties of mathematical models of EPS transient regimes (trivial, simple, complete) are presented. Transient process of a synchronous two-machine system is described by the complete model. The quality of transient processes of a synchronous machine depends on the number of rotor excitation windings. When there are two excitation windings on the rotor (dual system of excitation), the mathematical model of electromagnetic transient processes of a synchronous machine is represented in a complex form, i.e. in coordinate system d, q, the current of rotor being represented by a generalized vector. In asynchronous operation of a synchronous two-machine system with two excitation windings on the rotor the current and voltage systems include only harmonics of two frequencies. The mathematical model of synchronous steady-state process of a two-machine system is also provided, and the steady-state regimes with different structures of initial information are considered.

scholarly journals PERANCANGAN DAN ANALISA SISTEM KENDALI FREKUENSI SISTEM TENAGA LISTRIK DENGAN METODE PENEMPATAN KUTUB

2017 ◽  
Vol 10 (2) ◽  
pp. 37-48
Author(s):  
Heru Dibyo Laksono ◽  
Aditya Putra Pratama
Keyword(s):  
Steady State ◽  
Power System ◽  
Electric Power ◽  
Electric Power System ◽  
Frequency Deviation ◽  
Maximum Peak ◽  
Time Value ◽  
Placement Method ◽  
Type Frequency ◽  
Peak Value

This study discusses the application of Polar Placement method using Bass - Gura algorithm on Non - Reheat type frequency electric control system with emphasis on frequency deviation on power system. The performance indicators of electric power system that can be calculated and observed include error analysis, response speed, response quality, frequency domain analysis, stability analysis and robustness analysis of the frequency deviation response of electric power system. The simulation results show that the non-reheat type deviation of electric power with Polar Placement method shows better result compared to non-reheat type frequency power deviation response without the Polar Placement method with a steady state error value of 0.0041, the rise time value of 0.0562 second, the peak time value is 0.0049 seconds, the time value of the steady state is 0.5113 seconds, the maximum pass value is 19.2112%, the root of the characteristic equation which all the parts are negative, the maximum peak value is 1.0049 and the maximum peak value of complementary sensitivity is 0.0051. Keywords: Frequency Deviation, Polar Placement, Bass - Gura Algorithm, Non – Reheat

Characteristic and Model Analysizes of Steady-State Harmonic Source for DC Charger

2013 ◽  
Vol 336-338 ◽  
pp. 536-541
Author(s):  
Lin Sang ◽  
Jian Cheng Ye ◽  
Ming Pan
Keyword(s):  
Steady State ◽  
Power System ◽  
Electric Power ◽  
Electric Power System ◽  
Fundamental Wave ◽  
System Construction ◽  
Nonlinear Load ◽  
Coupling Circuit ◽  
New Type ◽  
Harmonic Source

The objective of this paper is to present the system construction and operational principle for a DC charger of electric vehicle. By means of analyzing AC and DC sides for the chargers, a reason was derived theoretically for producing specified harmonic current while absorbing fundamental wave of electric power system. The modeling and measuring procedures of multi-harmonic source for single and multiple chargers were proposed. The summation effect of harmonics for charge/exchange station which was regard as a public coupling circuit (PCC) of the electric power system. The simulation and measuring results indicate that as a new type of nonlinear load, the charger represented a characteristic of steady-state harmonic source.

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