EPE Association: EPE-PEMC 2008 - Topic: Microgrid and Power Quality

EPE-PEMC 2008 - Topic: Microgrid and Power Quality
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Microgrid and Power Quality

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   A Method of Three-Phase Balancing in Microgrid by Photovoltaic Generation Systems
By Masahide Hojo [View]
[Download]

Abstract: Recently, a small-scale power system has been able to perform autonomous or islanding operation with some distributed generators. But in such a microgrid, it is afraid that serious voltage imbalance may be caused by unbalanced loads during the islanding operation. Fortunately, grid interactive inverters of the distributed generators often have some amount of surplus capacity. This paper deals with a three-phase balancing method utilizing the surplus capacity. By the proposed method, the inverters output negative sequence currents to suppress the voltage imbalance within their surplus capacities. Operating characteristics and its effectiveness are confirmed by some simulation results.

   An Active Network Control Method Using Distributed Energy Resources in Microgrids
By Takayuki Tanabe [View]
[Download]

Abstract: An active network control method using distributed energy resources in microgrids is shown. Some features of the system were outlined. And also, power system stabilizer to compensate for the fluctuation of active power in microgrid is proposed. The microgrid with these new techniques can contribute to efficient operation of DGs and stable power supply for customers.

   Development of HILS (Hardware In-Loop Simulation) System for MMS (Microgrid Management System) by Using RTDS
By Jin-Hong Jeon [View]
[Download]

Abstract: 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 action of MMS is designed to control the microsource's power output set-point in order to make the BESS power output zero. The test results show that the secondary regulation action of MMS can regulate the frequency and voltage while minimizing the consumption of the stored energy of BESS.

   Energy Management in Solar Photovoltaic Plants Based on ESS
By M. Lafoz, L. García-Tabarés, M. Blanco [View]
[Download]

Abstract: Taking into account the increasing penetration of renewable energy sources in the electric grid it has become important to manage these resources to improve the availability, reliability and quality of the electric power. In order to connect to the electric grid a solar photovoltaic (PV) plant with the characteristic of Energy Management it is required a set of conditions established by the Transmission System Operator (TSO). Among those, there are important points as the reliability in the power prediction, obligation to provide energy reserve and support to voltage disturbances. In order to provide a reserve of energy, some possibilities are proposed in this paper, all of them based on the Energy Storage System concept. A hybrid batteries and flywheels solution will be analysed for a specific application of 1 MW, 1 MWh solar photovoltaic plant. Only technical evaluation has been developed.

   Power Quality Analysis of Jeju Island Power System with Wind Farm and HVDC System
By Jae-Hong Kim [View]
[Download]

Abstract: This paper presents the modeling and power quality analysis of Jeju island power system connected with wind farm, current source type HVDC system, and thermal power plant. It is for indicating the influence of wind farm operation in steady and transient state in Jeju island power system. For the computer simulation, four kinds of main items are modeled, which are 83(MW) wind farm, 300(MW) HVDC system, thermal power plant, and Jeju power load. To analyze the influence of the wind power generation to the Jeju power system, two kinds of simulations are carried out by using the PSCAD/EMTDC program. One is the steady state operation under the different wind speeds, and the other is the transient state operation when all of wind farms in Jeju island are disconnected from the Jeju power grid instantaneously due to the over wind speed than the rated value. These comparative studies are useful to analyze the influence of wind farms on the Jeju island power system stability.

EPE-PEMC 2008 - Topic: Microgrid and Power Quality
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Microgrid and Power Quality
	[return to parent folder]

	A Method of Three-Phase Balancing in Microgrid by Photovoltaic Generation Systems By Masahide Hojo	[View] [Download]
Abstract: Recently, a small-scale power system has been able to perform autonomous or islanding operation with some distributed generators. But in such a microgrid, it is afraid that serious voltage imbalance may be caused by unbalanced loads during the islanding operation. Fortunately, grid interactive inverters of the distributed generators often have some amount of surplus capacity. This paper deals with a three-phase balancing method utilizing the surplus capacity. By the proposed method, the inverters output negative sequence currents to suppress the voltage imbalance within their surplus capacities. Operating characteristics and its effectiveness are confirmed by some simulation results.

	An Active Network Control Method Using Distributed Energy Resources in Microgrids By Takayuki Tanabe	[View] [Download]
Abstract: An active network control method using distributed energy resources in microgrids is shown. Some features of the system were outlined. And also, power system stabilizer to compensate for the fluctuation of active power in microgrid is proposed. The microgrid with these new techniques can contribute to efficient operation of DGs and stable power supply for customers.

	Development of HILS (Hardware In-Loop Simulation) System for MMS (Microgrid Management System) by Using RTDS By Jin-Hong Jeon	[View] [Download]
Abstract: 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 action of MMS is designed to control the microsource's power output set-point in order to make the BESS power output zero. The test results show that the secondary regulation action of MMS can regulate the frequency and voltage while minimizing the consumption of the stored energy of BESS.

	Energy Management in Solar Photovoltaic Plants Based on ESS By M. Lafoz, L. García-Tabarés, M. Blanco	[View] [Download]
Abstract: Taking into account the increasing penetration of renewable energy sources in the electric grid it has become important to manage these resources to improve the availability, reliability and quality of the electric power. In order to connect to the electric grid a solar photovoltaic (PV) plant with the characteristic of Energy Management it is required a set of conditions established by the Transmission System Operator (TSO). Among those, there are important points as the reliability in the power prediction, obligation to provide energy reserve and support to voltage disturbances. In order to provide a reserve of energy, some possibilities are proposed in this paper, all of them based on the Energy Storage System concept. A hybrid batteries and flywheels solution will be analysed for a specific application of 1 MW, 1 MWh solar photovoltaic plant. Only technical evaluation has been developed.

	Power Quality Analysis of Jeju Island Power System with Wind Farm and HVDC System By Jae-Hong Kim	[View] [Download]
Abstract: This paper presents the modeling and power quality analysis of Jeju island power system connected with wind farm, current source type HVDC system, and thermal power plant. It is for indicating the influence of wind farm operation in steady and transient state in Jeju island power system. For the computer simulation, four kinds of main items are modeled, which are 83(MW) wind farm, 300(MW) HVDC system, thermal power plant, and Jeju power load. To analyze the influence of the wind power generation to the Jeju power system, two kinds of simulations are carried out by using the PSCAD/EMTDC program. One is the steady state operation under the different wind speeds, and the other is the transient state operation when all of wind farms in Jeju island are disconnected from the Jeju power grid instantaneously due to the over wind speed than the rated value. These comparative studies are useful to analyze the influence of wind farms on the Jeju island power system stability.