EPE Association: EPE 2013 - LS9e: HVDC/FACTS II

EPE 2013 - LS9e: HVDC/FACTS II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS9e: HVDC/FACTS II

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   Current Source Modular Multilevel Converter for HVDC and FACTS
By Jiaqi LIANG, Jyoti SASTRY, Pierluigi TENCA, Frans DIJKHUIZEN, Alireza NAMI [View]
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Abstract: A current source modular multilevel converter (MMC) is proposed for high voltage AC/DC powerconversion applications, such as HVDC and FACTS. Current source converters possess the advantageof short-circuit fault tolerance, which is a pivotal feature for grid applications. By partially followingthe circuit duality transformations, the proposed converter is derived from the well-known voltagesource MMC. Inductor-based current source cells are connected in parallel and form a current sourcearm that can synthesize a desired current waveform. By adding a reduced-energy capacitor in parallelto each current source arm, these arms can be further connected in series, thereby allowing voltagescaling. By using fully controllable switches, the converter is capable of providing full control on itsactive and reactive power. Protection schemes against open-circuit failures inside the inductor cells arealso proposed. Simulation results show the operation of the current source MMC and its capability ofDC fault tolerance.

   IGBT Overcurrent Turn-off Tests for the MMC-Based VSC Valves
By Tianning XU, Mark DONOGHUE, Colin DAVIDSON [View]
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Abstract: Nowadays, the Multi-level Modular Converter (MMC) has shown more and more advantages over the traditional Pulse Width Modulation (PWM)-based converter and has been widely adopted as the preferred topology for VSC (Voltage Sourced Converter) valves for High Voltage Direct Current (HVDC). Though IEC 62501 has been published since 2009 to define the requirements of the electrical testing for the VSC valves, so far very few papers have really discussed the test methods for any VSC valve tests or disclosed any test results. In this paper, one of the most important tests required by IEC 62501, the IGBT Overcurrent Turn-off test, is discussed for MMC-based VSC valves. Several faults that may occur when the IGBT can experience overcurrent are analysed, the test methods for several supplementary tests are discussed and finally the relevant test results are presented.

   Space-vector-based controller for current-harmonic suppression with a shunt active power filter
By Aurelio GARCIA-CERRADA, Miguel OCHOA-GIMENEZ, Javier ROLDAN-PEREZ, Juan Luis ZAMORA-MACHO [View]
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Abstract: Active power filters are often proposed as flexible solutions to tackle power quality problems in electricdistribution systems. The need for tracking harmonic currents and voltages with these electronic devicesexceeds the capabilities of conventional Proportional+Integral controllers and more sophisticated algorithms are sought. This paper presents a control method based on multiple reference frames for tracking or rejecting periodic signals in this context. The proposed scheme allows recursive calculation when referring signals to reference frames rotating synchronously with harmonic equivalent space vectors whilst only a very small number of trigonometric-function evaluations are required. Furthermore, using the proposed approach, the control of each harmonic can be dealt with using the same simple Integral controller. Detailed simulation of a shunt active power filter is provided to validate the main contributions of the paper, including an scenario with grid-frequency variation to evaluate the adaptation capability of the proposed controller.

EPE 2013 - LS9e: HVDC/FACTS II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 16: Power electronics in transmission and distribution > EPE 2013 - LS9e: HVDC/FACTS II
	[return to parent folder]

	Current Source Modular Multilevel Converter for HVDC and FACTS By Jiaqi LIANG, Jyoti SASTRY, Pierluigi TENCA, Frans DIJKHUIZEN, Alireza NAMI	[View] [Download]
Abstract: A current source modular multilevel converter (MMC) is proposed for high voltage AC/DC powerconversion applications, such as HVDC and FACTS. Current source converters possess the advantageof short-circuit fault tolerance, which is a pivotal feature for grid applications. By partially followingthe circuit duality transformations, the proposed converter is derived from the well-known voltagesource MMC. Inductor-based current source cells are connected in parallel and form a current sourcearm that can synthesize a desired current waveform. By adding a reduced-energy capacitor in parallelto each current source arm, these arms can be further connected in series, thereby allowing voltagescaling. By using fully controllable switches, the converter is capable of providing full control on itsactive and reactive power. Protection schemes against open-circuit failures inside the inductor cells arealso proposed. Simulation results show the operation of the current source MMC and its capability ofDC fault tolerance.

	IGBT Overcurrent Turn-off Tests for the MMC-Based VSC Valves By Tianning XU, Mark DONOGHUE, Colin DAVIDSON	[View] [Download]
Abstract: Nowadays, the Multi-level Modular Converter (MMC) has shown more and more advantages over the traditional Pulse Width Modulation (PWM)-based converter and has been widely adopted as the preferred topology for VSC (Voltage Sourced Converter) valves for High Voltage Direct Current (HVDC). Though IEC 62501 has been published since 2009 to define the requirements of the electrical testing for the VSC valves, so far very few papers have really discussed the test methods for any VSC valve tests or disclosed any test results. In this paper, one of the most important tests required by IEC 62501, the IGBT Overcurrent Turn-off test, is discussed for MMC-based VSC valves. Several faults that may occur when the IGBT can experience overcurrent are analysed, the test methods for several supplementary tests are discussed and finally the relevant test results are presented.

	Space-vector-based controller for current-harmonic suppression with a shunt active power filter By Aurelio GARCIA-CERRADA, Miguel OCHOA-GIMENEZ, Javier ROLDAN-PEREZ, Juan Luis ZAMORA-MACHO	[View] [Download]
Abstract: Active power filters are often proposed as flexible solutions to tackle power quality problems in electricdistribution systems. The need for tracking harmonic currents and voltages with these electronic devicesexceeds the capabilities of conventional Proportional+Integral controllers and more sophisticated algorithms are sought. This paper presents a control method based on multiple reference frames for tracking or rejecting periodic signals in this context. The proposed scheme allows recursive calculation when referring signals to reference frames rotating synchronously with harmonic equivalent space vectors whilst only a very small number of trigonometric-function evaluations are required. Furthermore, using the proposed approach, the control of each harmonic can be dealt with using the same simple Integral controller. Detailed simulation of a shunt active power filter is provided to validate the main contributions of the paper, including an scenario with grid-frequency variation to evaluate the adaptation capability of the proposed controller.