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The droop control technology, which can achieve an autonomous power sharing among distributed resources interface converters, provides the advantages of enhanced system reliability and reduced complexity. However, the reactive power sharing accuracy of the conventional Q — V droop method can be degraded due to its dependence on the line impedances. The Q — V droop control method was proposed to reduce...
We propose a decentralized Maximum Likelihood solution for estimating the stochastic renewable power generation and demand in single bus Direct Current (DC) MicroGrids (MGs), with high penetration of droop controlled power electronic converters. The solution relies on the fact that the primary control parameters are set in accordance with the local power generation status of the generators. Therefore,...
In this paper, a load flow initialisation method is proposed to calculate the steady-state initial conditions required for small signal stability analysis of a converter-dominated microgrid. The proposed load flow simulation eliminates the need to run a flat start time-domain analysis in order to arrive at the initial values and therefore allows for the rapid small signal analysis of different network...
Microgrid transient stability is a challenging topic that is being widely discussed in the literature. One of the main characteristics of most microgrids is their lack of inertial loads or generators, as most of these elements are converter-interfaced devices. The reduction of the total inertia of microgrids reduces their transient stability under power variations. Primary control strategies of regulating...
The well-known active power-frequency and reactive power-voltage amplitude droop control is widely used in the coordinative control of parallel inverters in Microgrids. However, this conventional droop method may cause deviation on the frequency and voltage amplitude, which will affect the accuracy of power supply. This paper proposes a novel secondary control method to compensate this deviation....
One of the most important challenges associated with the droop control of parallel inverters in a microgrid is reactive power sharing between parallel units1. This paper proposes to integrate Direct Current Vector Control (DCVC) method2 with the droop control method to overcome this challenge. Another issue in droop control of parallel inverters in islanding mode is voltage level drop associated with...
Distributed Generation (DG) system is a futuristic step towards generation of electrical power energy. It is treated as a microgrid, which is integrated with renewable energy resources. The successful implementation of DG in ac distribution system depends on the Power Quality (PQ) of generation. The power conditioning or the power quality of the microgrid is accomplished by Unified Power Quality Conditioner...
MicroGrid is a local distribution system where loads are supplied by parallel-connected inverters controlled by decentralized active power/voltage frequency and reactive power/voltage magnitude droop controller. A paralleled ac system, such as a multi-inverter MicroGrid with droop controller, is susceptible to large variations in frequency/voltage magnitude. Therefore, the protection issues are very...
This paper proposes a linear quadratic regulator with integral action, ensuring fast dynamic response and resisting capability of voltage deviation from instantaneous reference grid voltage, to control the inverter voltage that can also be used in a microgrid. The proposed control strategy is based on a linear quadratic regulator, minimizing the cost function of the system, with integral action used...
Control strategies of a microgrid which includes both synchronous generators and converter-based distribution generation (DG) units must be designed such that effective operation of the microgrid is achieved. The main objective of this paper is to develop a high performance control strategy for an islanded medium voltage (MV) microgrid consisting of inverter and non-inverter interfaced DG units. A...
In this paper, a design of the control system for parallel distributed sources is proposed. These sources are connected together using inverters in an isolated low voltage microgrid. The inverters have been used to connect distributed power sources to microgrid with the capability of modification of the voltage amplitude and frequency. Also for the first time in IEEE publications, an automatic frequency...
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