Engineering Commons^™

Enabling Wind Power Plants With Frequency And Voltage Regulation Capability By Forced Curtailment, Anshuman Vaidya, Badrul H. Chowdhury, Manohar Chamana

Electrical and Computer Engineering Faculty Research & Creative Works

With higher penetration of renewable energy resources like wind energy, its utilization for the provision of ancillary services, such as frequency and voltage regulation, is imminent. This paper deals with allowing the wind power plant to provide these services in a microgrid environment with the consideration of different generation mixes of wind and conventional energy resources. a novel hysteresis control algorithm is implemented in the wind control system to compensate for the shortcomings of droop control during low wind conditions. a microgrid model test system is simulated in Matlab/Simulink environment to compare the performance of the control strategy, henceforth called …

Implementation Of A Microgrid Central Controller In A Laboratory Microgrid Network, Md Rasheduzzaman, Shyam N. Bhaskara, Badrul H. Chowdhury

Electrical and Computer Engineering Faculty Research & Creative Works

When distributed generation (DG) units operate in a microgrid environment, there is a need for coordinated operation between the DGs, the utility grid and the loads. a Microgrid Central Controller (MGCC) can keep track of the status from the systemic point of view and command the local micro source controllers (MC) to ensure system stability. in various modes of operation, vis-à-vis grid-connected, islanded and during transition from grid-connected to islanded mode and vice versa, the MGCC can support the MCs by feeding the necessary information to contribute towards stable system operation. This paper discusses the implementation of the MGCC for …

Protection And Control Of Active Distribution Networks And Microgrids, Mohammad Amin Zamani

Electronic Thesis and Dissertation Repository

This thesis is mainly focused on (i) modeling and control of Electronically Coupled Distributed Energy Resources (EC-DERs) under severe network imbalances and transient incidents, and (ii) protection of active distribution networks and microgrids against different types of faults. In the first part, an enhanced control strategy is proposed to improve the performance of EC-DERs under faults and transient disturbances, in a multi-unit microgrid setting. With the use of proposed control strategy, the host microgrid can ride through network faults, irrespective of whether they take place within the microgrid jurisdiction or impact the upstream grid, and quickly reclaim its pre-fault operating …

Optimal Energy Management For Microgrids, Zheng Zhao

All Dissertations

Microgrid is a recent novel concept in part of the development of smart grid. A microgrid is a low voltage and small scale network containing both distributed energy resources (DERs) and load demands. Clean energy is encouraged to be used in a microgrid for economic and sustainable reasons. A microgrid can have two operational modes, the stand-alone mode and grid-connected mode. In this research, a day-ahead optimal energy management for a microgrid under both operational modes is studied. The objective of the optimization model is to minimize fuel cost, improve energy utilization efficiency and reduce gas emissions by scheduling generations …

Laboratory-Based Microgrid Setup For Validating Frequency And Voltage Control In Islanded And Grid-Connected Modes, Shyam N. Bhaskara, Md Rasheduzzaman, Badrul H. Chowdhury

Electrical and Computer Engineering Faculty Research & Creative Works

Small sized synchronous generator based distributed generators (DG) often have low start-up times, and therefore serve as valuable dispatchable generators in a microgrid environment. the advantage is that it allows the power network to operate in a true smart grid environment. the disadvantage is that such DGs typically tend to have low inertia and the prime movers driving these resources need to be controlled in real time for them to operate effectively in islanded, grid-connected modes and during transition. When multiple DGs are present in the microgrid, the overall control can become complicated because of the need for sharing the …

Design, Implementation And Evaluation Of A Microgrid In Island And Grid Connected Modes With A Fuel Cell Power Source, Andrew T. Moore

Electronic Thesis and Dissertation Repository

The ability to connect a microgrid to the grid is an important step in the development and evolution of the modern power system. The principle objectives of this research are (1) to simulate a simple microgrid consisting of a PEM hydrogen fuel cell, load and connection to the grid and (2) to evaluate the resulting microgrid control system on a corresponding experimental microgrid.

The microgrid simulation demonstrated that the control algorithms can operate the microgrid in both islanded (VSC with voltage and frequency regulation) and grid connected (VSC with current control for power transfer).

The experimental laboratory microgrid was constructed …

Stability Analysis Of An Autonomous Microgrid Operation Based On Particle Swarm Optimization, Waleed Al-Saedi, Stefan Lachowicz, Daryoush Habibi, Octavian Bass

Research outputs 2012

This paper presents the stability analysis for an inverter based Distributed Generation (DG) unit in an autonomous microgrid operation. The small-signal model of the controlled Voltage Source Inverter (VSI) system is developed in order to investigate the dynamic stability for the given operating point and under the proposed power controller. This model includes all the details of the proposed controller, while no switching actions are considered. System oscillatory modes and the sensitivity to the control parameters are the main performance indices which are considered, particularly when the microgrid is islanded or under the load change condition. In this work, the …

Fuzzy Logic For Smart Utilisation Of Storage Devices In A Typical Microgrid, Thair Mahmoud, Daryoush Habibi, Octavian Bass

Research outputs 2012

Efficient utilisation of Storage Devices (SD) among multiple sources of dispatch within a typical microgrid have a substantial impact on reducing the economic and environmental generation costs in that particular microgrid. Eventually, managing the multiple sources that supply energy simultaneously is a big engineering challenge. The complexity rises due the uncertainty of demand, generation cost, availability of renewable energy sources and (charging/discharging) time and price for the installed SD. This paper introduces a utilisation method that makes the SD more efficient in supplying the electricity within a typical medium size enterprise microgrid. The method is simply targeting the dynamic charging …

Dynamic Characteristics Of A Hybrid Microgrid With Inverter And Non- Inverter Interfaced Renewable Energy Sources: A Case Study, A V. Jayawardena, L G. Meegahapola, S Perera, D A. Robinson

Faculty of Engineering and Information Sciences - Papers: Part A

Microgrids are becoming important constituents of electric power distribution networks. Microgrids are typically comprised of both inverter interfaced (e.g. double-fed induction generator (DFIG), solar-photovoltaic (PV) system) and non-inverter interfaced (e.g. synchronous generator) renewable energy generators (REGs), hence their dynamic characteristics are significantly different from the conventional grids comprised of centralised synchronous generators. Different inherent characteristics of REGs, power dispatch levels, relative REG capacities, and external grid characteristics are some of the important features of significant interest in relation to microgrid dynamic behaviour. For this study a microgrid model was developed in DIgSILENT Power Factory based on the IEEE-13 bus system …

Upqc For Power Quality Improvement In Dg Integrated Smart Grid Network: A Review, Shafiuzzaman Khadem, Malabika Basu, Michael Conlon

Articles

Quality of power supply has become an important issue with the increasing demand of Distributed Generation (DG) systems either connected to the grid through some power electronics grid-tie inverters or to work in isolated (microgrid) mode towards the development of a smart grid network. In this paper a technical review of Integration of Unified Power Quality Conditioner (UPQC) in Distributed Generation Network has been presented. Though the primary task of UPQC is to minimize the grid voltage and load current disturbance along with the reactive and harmonic power compensation, additional functionalities like compensation of voltage interruption and active power transfer …

Optimization In Energy And Power Management For Renewable-Diesel Microgrids Using Dynamic Programming Algorithm, Tu A. Nguyen, Mariesa L. Crow

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents an optimization analysis for energy and power management in microgrids with renewable energy resources and diesel generators. Dynamic Programming (DP) algorithm and the simplex method have been used to minimize the total daily cost of the system and also maximize the total efficiency of the energy storage system during charge and discharge. the algorithm is validated on a hybrid system for military forward operating base camps that contain a PV array, wind generator, hydrogen-Based fuel cell, batteries and diesel generators. © 2012 IEEE.