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For power system operation, transient stability analysis is indispensable. Of late, electric power systems have become more complicated; thus, fast transient stability analyses are critical for online computations. In this paper, we apply the Taylor series expansion to a time domain equal-area criterion applicable to multimachine systems and propose a fast transient stability analysis method that...
Cibatu34-Mandirancan is one of the most important subsystem in Jawa Bali system. Peak Load of this subsystem is about 1.700 MW, several industrial costumers are also located here. On 13th March 2014 disturbance occured on Indramayu-Kosambibaru. This disturbance was followed by tripping of two transmission lines and all generators in Indramayu Power Plant. Disturbance Fault Recorder (DFR) data showed...
This paper investigates the effect of wind speed variations on the small-signal stability of doubly-fed induction generator-based wind turbines equipped with modified virtual inertial controllers (MVIC). MVIC is a control scheme that prudentially emulates the inertial response of the conventional synchronous generators for wind turbines in order to improve their frequency control performance. It also...
In this paper, a dual parallel connected brushless direct current (BLDC) motors drive system fed by a single inverter is presented and the control method for stable operation in electric vehicles (EVs) application is proposed. To obtain the stability of such a system, both motors should always be respect the synchronism even if they have different load torque. The proposed control method is based...
In this paper, the simultaneous trajectory tracking of the speed and the flux state variables of induction machines is realized. Nonlinear feedback control laws are designed to make both the rotor speed and the flux variables reach the desired nominal values in finite time. In this study, the speed, the stator currents, and the flux are assumed to be available for measurement. Numerical simulations...
Designing a control system for an induction motor (IM) is a generally twofold task: (1) controller synthesis and, (2) assessment of its stability. When using the full fifth order dq-frame model, with incomplete state information and unknown disturbances, the controller design and the proof of stability are not trivial tasks. In this paper, we propose a speed controller for the IM using a reduced-order...
This paper presents an alternative control strategy for 4 degree-of-freedom pose regulation of a quadrotor using the Active Disturbance Rejection approach. The proposed controller was designed using a kind of Lyapunov energy function to ensure asymptotic stability for regulation, in addition to the active disturbance rejection feature which is based in sliding mode extended state observer. This control...
This paper presents the development of single machine infinite bus system (SMIB) model for transient stability studies with detailed synchronous machine model and a Power System Stabilizer (PSS) in Matlab/Simulink software. The proposed method of the SMIB simulator is computationally efficient and flexible for interfacing the synchronous machine with the external network and for extending to multimachine...
The presence of both electronic-converter-based and rotating-machine-based energy sources in microgrids poses a challenge for its stable operation. Most of the stability studies in microgrids have been focused on the electronic converters interfacing a renewable energy source to an AC microgrid. However, the rotating machines are still a key component of many microgrids. This paper presents an induction...
With increasing penetration of renewable energy generators, such as wind doubly-fed induction generators (DFIGs), semiconductor based power converters are getting widespread applications into the traditional power system. Under this trend, future smart grid will become definitely a power electronic converters dominated power system. This change and evolution make it hard to describe the interactions...
In this paper, the stochastic excitations in single machine infinite bus power systems have been modeled as alpha-stable Levy processes. Through the simulations of the corresponding stochastic differential equations, we have shown that the impulsiveness and/or asymmetry in the distributions of the load fluctuations can cause the instability of the rotor angle. Hence, the synchronism is lost and the...
In this paper the induction motor state estimator based on current MRAS-type concept with a modified speed adaptation algorithm is presented. Its stability in motoring and regenerating modes is analysed. The influence of motor parameter mismatch to the stability boundaries is presented. It is shown that one of the proposed modification methods of the adaptation algorithm makes the estimator stable...
This paper deals with a robust formation control methodology for the Multi-UAV system with uncertain exogenous disturbance. The fourth-order UAV model with disturbance and the disturbance estimate system is introduced. In order to achieve the rigid formation fight, graph theory and consensus algorithm are utilized and the state of the UAVs converges to desired value by using Leader-Follower structure...
The objective of this work is to evaluate performance of three phasor estimation algorithms proposed in literature, under electrical system signals. Signals obtained from electrical systems response to disturbances in which the electrical system is stable or operates in a condition of transient instability, frequency or voltage. The performance during the transient state of the system is evaluated...
Small-disturbance angle stability or low-frequency oscillation is one of the important stability in the power system. Although damper windings and power system stabilizer (PSS) have been proved to stabilize and improve small-disturbance angle stability. However, due to increasing demand in the recent years, adding redox flow batteries (RFB) as additional devices is crucial. This paper investigates,...
Permanent Magnet Synchronous Motor is characterized by high power density, high efficiency and high reliability, and it is superior in many applications. V/f control for PMSM is able to get rid of the expensive rotor position sensor, and it is of great research value. V/f control method for PMSM is investigated in this paper. Firstly, the reason for the instability of the traditional open-loop V/f...
A fault tolerant control approach is proposed in this paper for quadrotor Unmanned Aerial Vehicle (UAV) subject to time varying disturbances and actuator faults. The approach is based on a Super-Twisting (STW) control algorithm and a Higher Order Sliding Mode Observer (HOSMO). The HOSMO generates the exact estimates of the unmeasured states and time varying disturbances without any filtration that...
We investigate the stability of a microgrid composed of two identical synchronous generators, inductive lines and resistive loads, without using any model reduction for “fast” variables. We derive sufficient conditions for local exponential stability, with a region of attraction that includes any initial state such that the states of the generators are sufficiently close to each other. This implies...
Due to the existence of mass unbalance and sensor runout, magnetically suspended rotor (MSR) system will generate harmonic current. The ratio of sampling frequency to fundamental frequency of the harmonic current is not always an integer. However, the existing repetitive controller (RC) for harmonic current suppression of MSR can only compensate for the cases where the ratio is an integer, so the...
The existence of new power injection at a system will effect system stability that existed before, so stability analyze was needed to know the system conditioning before and after power injection, and performance system after disturbance, by observe rotor angle, frequency, and voltage. The result of dynamic system show that power injection of Gen XY can supply 0,021 pu at bus 1, 0,001 at bus 2, 0,001...
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