EPE Association: EPE 2018 - LS2c: DC Grids and Micro-Grids

EPE 2018 - LS2c: DC Grids and Micro-Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - LS2c: DC Grids and Micro-Grids

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   An improved Cooperative Control Method of DC Microgrids Based on Finite Gain Controller
By Muhammad Adnan MUMTAZ [View]
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Abstract: DC microgrids have gained a lot of consideration over its AC counterpart due to its increased efficiency, reduced volume, greater flexibility and capital cost. The control objectives in the literature for secondary/primary control of DC microgrid are voltage regulation and proportional load sharing, which requires the proper voltage set-point for the particular converter. In conventional approach, primary controller voltage point is adjusted conferring to average value of voltage and current of the whole system. In this paper considering the objective of secondary/primary control of a DC microgrid, an improved technique is proposed. A finite gain voltage controller is introduced to achieve droop like performance with one P controller in current loop, and finite gain controller in the voltage loop of buck converter. To reduce the communication delay effect, a different method is implemented to measure the average voltage and current difference. Key advantages of the proposed technique are simple design, flexible communication structure, better stability and higher scalability. Based on this new structure of individual converter, a four-node DC microgrid setup with ring communication structure is examined in MATLAB/Simulink environment and simulation results verify the efficiency of the improved proposed technique.

   Design of Droop Controllers for Converters in DC Microgrids Towards Reducing Bus Capacitance
By Guangyuan LIU [View]
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Abstract: DC microgrids based on droop-controlled Distributed Energy Resources (DERs) converters tend to havelarge bus capacitance in order to guarantee stiff bus voltage. Large bus capacitance leads to the increase of weight, size, and cost. Indeed, since the droop control inherently allows the bus voltage to vary in a certain range, there is no need to restrict the dynamic bus voltage fluctuation to such a low level. Thus, as long as the bus voltage is maintained in the acceptable range, smaller bus capacitance can be chosen. This paper firstly gives the design criterion of the output capacitance for DERs converters. Then, the design of droop controllers are presented, so that the output capacitance can be reduced while the bus voltage is still kept in the allowable range during any transient. Since voltage-current (V-I) and current-voltage (I-V) droop control methods show different characteristics, separate design procedures are introduced for them. Finally, the proposed design methods are validated by means of experimental results performed on a dc microgrid prototype composed of two 3kW converters.

   Investigation on Power Quality Parameters of Industrial 600V DC Microgrid Hardware
By Armands SENFELDS [View]
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Abstract: Paper describe physical DC microgrid realization for research and modelling tasks and its alignment withunique DC microgrid installation at automotive factory under real manufacturing conditions. Focus onkey component modelling and verification such as bidirectional grid interface AC/DC frontend converterhas been presented at real load conditions.

   Self-powered supply and control system for hybrid semiconductor DC switch
By Mehanathan PATHMANATHAN [View]
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Abstract: This paper provides details regarding the design of a self-powered supply used with a hybrid DC switch, and its control system. The power supply was configured to accept the voltage over the contacts of the DC switch as its source and deliver a stable 5 V output rail. This output voltage was used to power a microcontroller which generated a sequence of control pulses for thyristors used in the hybrid switch. These thyristors were used to charge and discharge a resonant circuit which ultimately provided a counter current capable of extinguishing an arc which occurred over the contacts of the DC switch when interrupting DC current.

EPE 2018 - LS2c: DC Grids and Micro-Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - LS2c: DC Grids and Micro-Grids
	[return to parent folder]

	An improved Cooperative Control Method of DC Microgrids Based on Finite Gain Controller By Muhammad Adnan MUMTAZ	[View] [Download]
Abstract: DC microgrids have gained a lot of consideration over its AC counterpart due to its increased efficiency, reduced volume, greater flexibility and capital cost. The control objectives in the literature for secondary/primary control of DC microgrid are voltage regulation and proportional load sharing, which requires the proper voltage set-point for the particular converter. In conventional approach, primary controller voltage point is adjusted conferring to average value of voltage and current of the whole system. In this paper considering the objective of secondary/primary control of a DC microgrid, an improved technique is proposed. A finite gain voltage controller is introduced to achieve droop like performance with one P controller in current loop, and finite gain controller in the voltage loop of buck converter. To reduce the communication delay effect, a different method is implemented to measure the average voltage and current difference. Key advantages of the proposed technique are simple design, flexible communication structure, better stability and higher scalability. Based on this new structure of individual converter, a four-node DC microgrid setup with ring communication structure is examined in MATLAB/Simulink environment and simulation results verify the efficiency of the improved proposed technique.

	Design of Droop Controllers for Converters in DC Microgrids Towards Reducing Bus Capacitance By Guangyuan LIU	[View] [Download]
Abstract: DC microgrids based on droop-controlled Distributed Energy Resources (DERs) converters tend to havelarge bus capacitance in order to guarantee stiff bus voltage. Large bus capacitance leads to the increase of weight, size, and cost. Indeed, since the droop control inherently allows the bus voltage to vary in a certain range, there is no need to restrict the dynamic bus voltage fluctuation to such a low level. Thus, as long as the bus voltage is maintained in the acceptable range, smaller bus capacitance can be chosen. This paper firstly gives the design criterion of the output capacitance for DERs converters. Then, the design of droop controllers are presented, so that the output capacitance can be reduced while the bus voltage is still kept in the allowable range during any transient. Since voltage-current (V-I) and current-voltage (I-V) droop control methods show different characteristics, separate design procedures are introduced for them. Finally, the proposed design methods are validated by means of experimental results performed on a dc microgrid prototype composed of two 3kW converters.

	Investigation on Power Quality Parameters of Industrial 600V DC Microgrid Hardware By Armands SENFELDS	[View] [Download]
Abstract: Paper describe physical DC microgrid realization for research and modelling tasks and its alignment withunique DC microgrid installation at automotive factory under real manufacturing conditions. Focus onkey component modelling and verification such as bidirectional grid interface AC/DC frontend converterhas been presented at real load conditions.

	Self-powered supply and control system for hybrid semiconductor DC switch By Mehanathan PATHMANATHAN	[View] [Download]
Abstract: This paper provides details regarding the design of a self-powered supply used with a hybrid DC switch, and its control system. The power supply was configured to accept the voltage over the contacts of the DC switch as its source and deliver a stable 5 V output rail. This output voltage was used to power a microcontroller which generated a sequence of control pulses for thyristors used in the hybrid switch. These thyristors were used to charge and discharge a resonant circuit which ultimately provided a counter current capable of extinguishing an arc which occurred over the contacts of the DC switch when interrupting DC current.