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In this paper, a coordinated state-of-charge (SOC) control strategy for the energy storage system operating under microgrid islanded mode to stabilize the frequency and voltage was proposed. The proposed SOC control loop makes up of PI controller, which uses a SOC state of the energy storage system (ESS) as an input and an auxiliary reference value of secondary control as an output. The SOC controller...
Microgrid technology, becoming the main application form of distributed generation with high permeability, can effectively alleviate the impacts on large power grid of distributed generation. Microgrid system, as the carrier of microgrid control strategy, can provide verification platform for the research of microgrid control strategy. In this paper, an integrated microgrid system with flexible structure...
This paper introduces a microgrid system having been developed in Korea. Firstly, the Korean Power IT (Information Technology) development program and its environment are shortly described including the concept of Korean microgrid and characteristics of its components. And then, the microgrid system, the functions of its components and test facilities are explained which are established in KERI (Korea...
In today's world, according as interest about renewable energy source rises, many researches are progressing about energy source development and power distribution system configuration for improving renewable energy source's efficiency. The microgrid is small power system that consists of several consumer's loads and small size distributed resources and accomplishes one independent system. It is operated...
This paper proposes a new method to determine the droop of the inverter-based distribution generations (DGs). Conventionally, inverter-based DGs have droop controller with fixed slope according to their capacity. Some additional control methods have been proposed in order to enforce the maximum or minimum limit of a unit. However, in some severe cases, the frequency deviation during the islanded mode...
The output voltage asymmetry could lead to working disorders and even damage of electronic devices. One of most common causes of micro-source three-phase output voltage asymmetry is local micro-source three-phase load imbalance. The problem of load imbalance has not yet the relatively general solution for micro-grid three-phase four-wire structure at present. In this paper, the two existing control...
This paper examines stability performances of a micro-grid application under both small and large disturbances, including islanding mode of operation. The system modeled encompasses dynamics and control of the doubly-fed induction generator, wind turbine, synchronous generator, and constant-power load. Fluctuation of wind speed is modeled using Weibull distribution. Simulated test results reveal that...
This paper proposes a structure of an HILS based development system for MMS. This system is composed of RTDS and its hardware interface devices, MMS, communication emulator modules. The RTDS is operated for real-time simulation for both microgrid and microsource models. By using this HILS system, the secondary regulation action of MMS during an islanded operation is evaluated. The secondary regulation...
This paper develops a voltage/frequency regulation scheme for an islanded distributed energy resource (DER) unit. The DER can be either a distributed storage (DS) unit or a dispatchable distributed generation (DG) unit. The DER unit is represented by a (time-varying) DC voltage source that is electronically interfaced to an aggregate of loads. The electronic interface consists of a voltage-sourced...
This paper describes control methods for proper load sharing between parallel converters connected to microgrid supplied by distributed generators. The model of the microgrid power system is simulated in PSCAD. It is assumed that the microgrid supplies a load both in grid connected and islanded modes. Both passive loads and inertial loads are considered. A control strategy is proposed to improve the...
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