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An open-loop and closed-loop operating boost-power-stage converter with relatively low damping factor exhibit resonant behavior in transient conditions. Such an undamped transient characteristic introduces overshoot to the control-to-output-variable transfer function, which is also visible in the inductor current transient behavior. Therefore, due to the either too large duty ratio or voltage-reference...
With the development of the smart meters, demand response (DR) is able to provide fast ancillary services, such as frequency control. Some recent studies demonstrated that DR can perform like thermal generators in the frequency control. However, little attention has been paid to DR's effect on the electromechanical oscillations of the power system. Fast-response DR can not only affect system frequency,...
A power oscillation damping controller of the multi-terminal direct current (MTDC) system is proposed in this paper. In a MTDC system, due to the interaction between different generators, interarea oscillation has shown great influence on the system stability. To damp the interarea oscillation, a damping controller for MTDC system is proposed in this paper. Firstly, the topology and control strategy...
The impact of static generators on power system small signal stability is evaluated by means of micro-synchrophasors collected in a distribution system using a class A Power Quality recorder that also functions as a Phasor Measurement Unit. Distributed generation of renewable energy could be a possible concern to the traditional power system where inertia of rotating generators is available during...
This work presents a comprehensive methodology for location and tuning of Power System Stabilizers (PSSs) based on multi-machine criteria. This goal is achieved by means of exploiting the benefits of the DIgSILENT PowerFactory software for management of large and complex electric power systems, and the potential of DIgSILENT Programming Language (DPL) that allows combining different application routines,...
The purpose of this work is to find the optimal location of sliding mode control and power system stabilizer in order to damp electromechanical oscillations in the power system using the residue method. The proposed control is evaluated performing several simulations on a modified version of the 39-bus New England power grid. A modal analysis is performed at the test system in order to evaluate numerically...
This paper proposes a new strategy for vibration harvesting using piezoelectric material. This work relies on an adaptation of the classical Synchronous Electrical Charge Extraction (SECE). Instead of harvesting the energy at every displacement extremum, we choose to wait a certain number of extremum before harvesting the accumulated energy. This technique extends the harvested power compared to SECE,...
Oscillations are inherent to power systems and the analysis of such phenomena is a fundamental issue for understanding the dynamical behavior of power networks. Knowledge of the system natural frequencies and its associated damping ratio, is useful information for understanding the system performance after being subjected to a disturbance. Topological changes in the transmission network of electrical...
In this paper, an integrated and modular control design is developed for distributed energy resources (DERs) to stabilize power systems and minimize effects of load variations and intermittent generation. Traditionally, the droop control of each generator (or virtual power plant) works as a local feedback loop to track frequency during load disturbance, whereas automatic generation control (AGC) calculates...
A simultaneous coordinated design of PSS and variable impedance devices such as TCSC and SVC for damping the power system oscillations and enhancing the stability in multi-machine power systems is presented in this paper. To achieve the best control results, adaptive velocity update relaxation particle swarm optimization (AVURPSO) algorithm is used to optimize the parameters of PSS and SVC and TCSC...
Generally in power system the vibrant power and current constraint will vary by the subject of generators and it addresses the deviations by rearrangement process. The major aspire of the development is to sort out the requirement of vibrant power load. The generator excitation loop will tune the dynamic power trigger by the maximum value of electricity over the network. By the link of stabilizer...
This paper discussed the tuning process of the power system stabilizer (PSS) for a nuclear turbine-generator excitation system. By measuring the non-compensated phase-frequency characteristic of the excitation without PSS, and through calculation and critical gain test, the PSS parameters are determined. Through step response and anti-regulation experiment, the effectiveness of the PSS is verified.
STATCOMs provide grid with not only reactive power compensation but auxiliary stability support through exerting influence on the dynamic behavior of Synchronous Generator (SG) during grid power oscillations. In this paper, method of electrical torque analysis is utilized to analyze the mechanism of STATCOM affecting the transient performance of SG when operates in power oscillations suppression mode,...
The current and massive deployment of non-synchronous generation is degrading the inertial response in power systems. The addition of an extra control loop, the so-called synthetic inertia, can contribute in the improvement of the frequency response, through an additional power injection. In this paper, the active damping method is used to enhance both, the closed-loop current control and the synthetic...
Interconnected power systems are critically vulnerable to instability due to the disturbances in any one portion of the system. Even low-frequency oscillations and small disturbances may lead to an outage of the system. Properly tuned Power System Stabilizer (PSS) is an effective tool for the suppression of these oscillations. This paper proposes a novel approach to tune proportional-integral (PI),...
This paper presents the wave tank test results on an innovative system for converting mechanical energy from waves directly to electricity. It consists of a point-pivoted buoy that oscillates in presence of waves and a ball screw based electro-mechanical generator. A damping force was applied for the system control by connecting the generator to an electrical load. The numerical model of the complete...
This paper presents a dual-source energy harvesting circuit that efficiently and simultaneously extracts the energy from a piezoelectric transducer (PZT) and a thermoelectric generator (TEG). The harvester operates in a dual-source pile-up mode (DPM) to efficiently extract the energy from both sources with an increment of the damping force, resulting in a 1452% improvement of power extraction even...
A TSO is responsible for system security and reliability and therefore it has to ensure the correct operation of new WAMS applications before it can make operational decisions based on the applications. The power system may have different power flow patterns and it is used with different grid topologies and generator connections, and the applications have to perform in these different circumstances...
In this paper, a Wide Area Control (WAC) scheme cooperates with Renewable Energy Sources (RESs) to achieve a robust power oscillation damping. The WAC signals are synthesized by a two-level hierarchical controller which utilizes global measurements from all the installed synchronous generators to maximize the performance of the generators' local controllers. In the proposed WAC scheme, the dynamic...
This paper proposes a controller for energy storage (ES) to improve damping of power system oscillation. The controller manages charge and discharge of an ES device to respond to the real-time frequency deviation measured locally to provide positive damping effects. The expected damping ratio improvement from an ES equipped with this controller is derived mathematically from a single-machine-infinite-bus...
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