The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Nowadays, the use of a distributed generation (DG) has increased because of the benefits such as increased reliability, reduced losses, and improvement in the line capacity and less environmental pollution. The protection of microgrids, which consists of generation sources, it is one of the most crucial concerns of basic distribution operators. One of the key issues in this field is the protection...
In this paper, a new coordination photovoltaic/battery micro-grid control strategy is proposed to improve the micro-grid fault ride-through capability. Under normal condition, the proposed strategy can restrain the influence of load fluctuations. When symmetrical grid fault happens, the micro-grid can ride through it by the proposed strategy. The DC-link bus voltage and AC current could be kept stable...
Based on comparing between the Composite Load Model (CLM) with the Synthesis Load Model (SLM), the SLM has been adopted in this paper. In view of the load model parameter identification's characteristics of complexity and low accuracy, a parameter identification method of the SLM based on Particle Swarm Optimization algorithm was proposed and used in the specific case study. It is shown by the case...
A novel bridgeless Buck power factor correction (PFC) converter with only half dead zones is proposed in this paper. The operation of the proposed PFC converter can be divided into two different modes including Buck mode in positive line cycles and Cuk mode in negative line cycles. Compared with the bridge or bridgeless Buck PFC converter, only half dead zones occur in this proposed PFC converter...
In this paper, cascaded H-bridge multilevel inverter (CHBMLI) based distribution static compensator (DSTATCOM) has been proposed. Synchronous reference frame theory (SRFT) based indirect current control is employed to extract the reference current. The instantaneous error in between the reference current and output current is processed through multiband hysteresis current controller (MHCC) for inner...
With the use of large amount of distributed generation(DG), the control strategy of inverter has become a hot area of research, which plays an important role in the microgrid stability. A control strategy combined droop control with PI control is proposed, in which the frequency and amplitude of output voltage is generate according to active and reactive power and the error between the output current...
A power management control method is proposed for the three-phase-to-single-phase matrix converter (MC)-based solid state transformer (SST) linking two grids. The MC-SST presents low weight and high controllability with respect to a conventional line-frequency transformer. Moreover, the single-stage ac-ac power conversion and compact volume are achieved compared to a three-stage SST, owing to the...
STATCOM/BESS decoupling control strategies of active and reactive power is proposed for a single wind turbine with squirrel-cage induction generator (WSG). This control strategy can not only effectively suppress power fluctuations of WSG output, achieve unity power factor and grid connected control so as to significantly improve the power quality of WSG, but also real-timely adjust extra power into...
In this paper, droop-based automatic control schemes are presented to control parallel inverter-interfaced distributed generators (DG) in a way that proportional reactive power sharing is possible in islanded microgrids under different structures. This paper modifies the conventional reactive power-voltage (Q-V) droop control strategy used in inductive (L-type) islanded microgrids by implementing...
Microgrids are key elements for integrating various distributed energy resources (DERs). Conventionally, the real power-frequency droop control and the reactive power-voltage magnitude droop control are adopted in DERs. However, when the power is up to an extreme limit, the frequency and voltage must be cut off and the control strategies can no longer adopt the droop control but the PQ control. In...
Based on the theoretical model of three-level converters, a mathematical model of the predictive active power and reactive power control is deduced. Relationship of both active power and reactive power with voltage vectors is analyzed from an instantaneous power perspective. Influence and tendency caused by voltage space vectors on the active power and reactive power are described in detail. Because...
In this paper, a grid-connected battery charger is developed. The developed battery charger is composed of a power factor corrector and a buck converter. The power factor corrector control the input current to be sinusoidal and in phase with utility voltage to perform unity power factor. The buck power converter is step-down the output power of power factor corrector to charge the battery set in constant...
This paper presents a new Maximum Power Loss Sensitivity (MPLS) method and Modified Plant Growth Simulation Algorithm (MPGSA) to find the optimal placement and size of Distributed Generation (DG). This study aims to reduce the total power loss and to improve the voltage profile. The proposed solution method has two steps: first, the MPLS is used to select the optimal position of the DG. Second, the...
This paper develops a distributed cooperative voltage control scheme involving primary and secondary voltage control for an autonomous microgrid (MG). The proposed distributed control algorithms are able to implement the fully local communication and control function among the inverter-based distributed energy resources (DERs) at the secondary stage. Moreover, it will not only regulate the voltage...
In this paper, the topology and the control scheme of the photovoltaic three-phase grid connected inverter based on voltage-oriented control (VOC) is analyzed. In VOC, a current control loop is used. The currents are controlled in a synchronous rotating dq-frame using a decoupled feedback control. The reference current of d-axis controller is extracted from instruction which comes from the former...
With the high penetration of distributed photovoltaic(PV) generations in low voltage (LV) distribution network, it causes overvoltage in feeder. Therefore, in this paper, impaction on voltage in radial LV grid for distributed PV generations is analyzed. Local voltage self-regulating control strategy of each PV converter to prevent overvoltage and improve the high permeability is proposed. The PV converter...
Energy efficiency and power crises are the critical issues that the globe is facing nowadays. Generation diversification, Demand Response, renewable energy accommodation, and reduction of Carbon dioxide emission are some of the issues that cannot be covered within the limitation of the current grid system. Smart Grid has revolutionized the generation, Distribution, and Consumption of electricity by...
This paper presents a detailed description of Finite Control Set Model Predictive Control applied to power converters. Some key features related to this methodology are presented and compared with model predictive control based space vector modulation methods. The basic models, principles, control diagrams, and simulation results are presented to provide a comparison between them. The analysis is...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.