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Ad hoc electrical networks are formed by connecting power sources and loads without pre-determining the network topology. These systems are well-suited to addressing the lack of electricity in rural areas because they can be assembled and modified by non-expert users without central oversight. There are two core aspects to ad hoc system design: 1) designing source and load units such that the microgrid...
In order to enhance the stability of grid-connected modular multilevel converters (MMC) system, which has become a prominent topology as an alternative to conventional voltage source converter in applications for high voltage, a novel single-phase circulating current suppressing strategy is proposed. This paper studies the mechanism and model of circulating currents of a single-phase MMC system at...
The integration of the renewable power generation into the existing grid has been increased significantly and it is expected to be increased further in near future. The placement of renewable power generation units can be done accordance with reactive power loadability and it has to be taken care during the optimal placement. In this paper, a particle Swarm Optimization (PSO) based optimal placement...
This paper presents the small signal stability (SSS) analysis of a standalone photovoltaic (PV) system with battery as backup source for power management between the source and the load. The stability of this system needs to be analysed for its proper and smooth operation. Lead-acid battery is commonly used in high power PV applications due to its low cost and availability in large size. Three independent...
This paper proposes the control of 'the three phase grid connected solar PV (Photovoltaic) system based on the FS-NLMF (Fast Sparse-Normalized Least Mean Fourth). The system uses a photovoltaic (PV) array, VSI (Voltage Source Inverter), and nonlinear loads. In this system VSI is connected with PV array to avail the three-phase active power to the three phase grid. In three phase distribution feeder...
Complexing power systems and increasing the amount of renewable energy sources (RES) in the power systems have caused new challenges such as stability, security problem, thus the analysis of stability in the power systems has become very crucial in order to maintain system equilibrium. In this paper, the electricity transmission network with an offshore wind farm (OWF) is modeled. For the grid model,...
Daily increasing in renewable energy sources installed in dispersed location, has led to greater need for long transmission lines to use these green sources. Voltage and phase stability are major challenges for transmission system operators in the operation of these lines. In this paper, a Static Synchronous Generators based in Synchronous Power Controller (SSG-SPC) is presented and implemented in...
Power-electronics-based Medium Voltage Direct Current (MVDC) shipboard power systems, consisting of several interconnected feedback-controlled switching converters, suffer from potential degradation of stability induced by negative incremental resistances due to the presence of constant power loads (CPLs). Several bus stabilizing control approaches have been presented in the past. In this work a novel...
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 problem of sensor fault tolerant control of a DC-DC buck converter for voltage regulation of a photovoltaic (PV) system is considered in this paper. By the mean of hybrid dynamical system approach (HDS); a new hybrid PV model is proposed in order to deal with the non-linearity of the PV mathematical model, the stability of the hybrid observer and the closed loop of the system is demonstrated by...
The bus voltage of DC microgrid is the key indicator of the stable operation of the system. The energy storage units play an important role in maintaining the stability of DC bus voltage in DC microgrid. In this paper, a virtual DC machine (VDCM) control strategy of energy storage converter in DC microgrid is adopted, aiming to solve the problem that the DC bus voltage is vulnerable to disturbed by...
With the development of Distributed Energy Systems the dynamic support of Microgrids Energy Quality is of great importance an optimized operating scheme for a grid-connected based photovoltaic (PV) system is analyzed. The proposed model comprises of a PV plant with lead acid batteries (LABs) Energy Storage coupled to the grid by means of a three-phase inverter (VSI). The PV plant and the battery storage...
This paper investigates the control of a paralleled sources in electrical power systems (EPS) of More-Electric Aircraft (MEA). A control strategy of three levels is developed for the EPS architecture under study. The conventional PI control is adopted in the second level of ‘dc current control’ and the tertiary level of ‘dq current control’. The primary level of power sharing control is accomplished...
In this paper, an adaptive network based fuzzy inference system (ANFIS) terminal sliding (TS) mode) controller is suggested for improving the reactive power and overall stability. This ANFIS control system consists of an ANFIS controller and a TS controller which is designed to do as a main controller and the TS controller is designed to cope with disturbances and uncertainties. Small signal model...
Coming days are becoming a much challenging task for the power system researchers due to the anomalous increase in the load demand with the existing system. As a result there exists a discordant between the transmission and generation framework which is severely pressurizing the power utilities. In this paper a quick and efficient methodology has been proposed to identify the most sensitive or susceptible...
In modern power systems and especially in autonomous distributed generation (DG), the frequency and voltage regulation should be continuously controlled. Hence the analysis of such a DG system is essential for the reliable operation of the local grid, with the voltage source inverter to play a key role as a controlled interface between the energy sources and the loads. In this frame, the complete...
This paper presents a low-voltage Flipped Voltage Follower (FVF) based output-capacitorless low-dropout (OCL-LDO) regulator. It consists of a transient-enhanced push-pull (TEPP) driving stage to improve the response at low quiescent power. With simple Miller compensation (SMC) and modified damping factor control (DFC) compensation, the regulator permits small compensation capacitance for maintaining...
Multilevel inverters supplied by independent sources are increasingly studied to connect these sources to grid. One of the challenges is voltage balancing. Indeed, when supplying powers coming from renewable sources are different, the inverter input voltages are unbalanced. In this paper, a stable DC bus voltage balancing technique without modifying MPPT algorithm is presented. This allows an MPPT...
This paper proposed four stability improvement methods by source-side PWM rectifier for More Electric Aircrafts (MEAs). These stabilization methods are based on injecting compensation signals into the control loop of the source-side PWM rectifier which can omit remote sensor and compensation signal of each load. Besides, they overcome the drawback that load-side active damping methods do harm to load...
In this paper, a small signal stability analysis of a recently developed controlled voltage source converter model, for use in large scale positive sequence time domain simulations, has been conducted. The state space model has first been developed at the device level and subsequently, the state space model of the system has been obtained. Further, the performance of the model to varying short circuit...
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