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An increased deployment of distributed generation in recent years has contributed to creation of meshed power networks usually seen as a way to improve power flow management capability. Also, power electronics converters have been commonly used to interface distributed resources to the grid, yet their impact on the network stability has not been sufficiently explored. In this paper the stability of...
In order to solve the distribution of voltage quality problems, this paper presents a new voltage regulation control strategy of distribution network based on switched affine model. By establishing the state space equation of the controllable series voltage regulation device, using the method of Lyapunov function and quadratic stability theory, according to the convex combination stability theory,...
The benefits of using Power Electronics Based DC Distribution Systems in diesel-electric vessels are well known. However, some aspects must be deeply analyzed to guarantee a safe, robust and stable system by design. A multivariable DC Distribution System mathematical model is presented and described in this work, where all the transmission lines and filters impedances are considered. The model has...
Main control objectives of grid-connected inverters include making the current injected into the grid keep accordance to its setting value without deviation, minimizing the harmonic current injected into the grid, and providing the system with good stability. To take all these indicators into account, this paper proposes a virtual circuit structure control scheme for grid-connected inverters. Aiming...
In this paper, the design of PR regulator which is applied on the grid-connected inverter with LCL-filter, is analyzed in details. By modeling the system under stationary frame, the open and close-loop transfer function is given, which is used in analyzing the impact of each parameter on root locus. Using the root locus theory, the proper parameters are selected so that the resonance of LCL-filter...
Stability analysis of power systems dominated by power electronics devices is a challenge for the future. This paper focuses in the analysis based on impedance representation of a three phases inverter operating as voltage source. Therefore, two small signal input impedance modeling methods are described, the first is the linearized state space model methodology and the second is based on the assumption...
Multi-converter power electronics systems are being increasingly used in many applications such as tele-communication systems, international space station, aircraft, electric vehicles, hybrid electric vehicles and fuel cell vehicles. Tightly regulated converter and motor drive systems tend to behave as constant power loads(CPL). Stability of the multi-stage power electronics intensive systems loaded...
This paper is concerned with the design and simulation of a pulse width modulation (PWM) rectifier for three-phase Permanent Magnetic motor drive. Based on the mathematical model of PWM rectifier, the dual-close-loop engineering design with decoupled feed-forward control is applied in the 3-phase voltage source rectifier. The objective to be reached is to realize unity power factor at the input ac...
Dynamic analysis of a power system is normally performed using a stability type approach, when the interest is in low frequency dynamics, in order to save simulation time. However the standard stability type methodology needs to be modified, when applied to power electronics dominated micro-grids, where the sources of the system are interfaced with inverters and there may be no synchronous machine...
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