A DC power flow controller and its control strategy in the DC grid

Yao, Liangzhong; Cui, Hongfen; Zhuang, Jun; Li, Guanjun; Yang, Bo; Wang, Zhibing

doi:10.1109/ipemc.2016.7512709

Cited by 15 publications

(3 citation statements)

References 8 publications

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“…The approach to inject series voltage [35] or current [36] avoids the problem of using fully rated components. Since the required PEC components are rated only for a fraction of , Pflow it is referred to as a partially rated PFC converter (PFCC) [27], [35], [37], [38]. Later, the stability of this approach was investigated in [39], and small-signal modeling was performed in [40].…”

Section: Development Challenges and Opportunitiesmentioning

confidence: 99%

Low-Voltage dc System Building Blocks: Integrated Power Flow Control and Short Circuit Protection

Purgat

Shekhar

Qin

et al. 2023

EEE Ind. Electron. Mag.

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Section: Development Challenges and Opportunitiesmentioning

confidence: 99%

Low-Voltage dc System Building Blocks: Integrated Power Flow Control and Short Circuit Protection

Purgat

Shekhar

Qin

et al. 2023

EEE Ind. Electron. Mag.

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“…However, despite the advances in the power electronics the cost and losses remain a bottleneck. Similar solutions using partially rated power flow control converters (PFCC) were independently proposed for high voltage dc and lvdc [25], [30], [31], [32]. The PFCC reduces losses from the system perspective with processing only a fraction of the power that it is controlling.…”

mentioning

confidence: 99%

Partially Rated Power Flow Control Converter Modeling for Low-Voltage DC Grids

Purgat

Blij

Qin

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Scalable and robust low voltage direct current distribution (lvdc) networks require solutions allowing flexible power flow control and reliable short-circuit protection. In this paper, the continuous full-order large and small signal models of a partially rated power flow control converter (PFCC) are derived utilizing the generalized averaging method. The large signal model of the PFCC is coupled with a model of the lvdc grid. Due to the state-space representation the combined model of the PFCC and the lvdc grid is suitable for easy algorithmization, and efficient simulation. These advantages make them essential tools for studying and optimizing of scalable lvdc systems with decentralized power flow control based on the PFCC. The PFCC models provide insights into controller design and stability analysis. The models are experimentally validated, and the functionality of the PFCC is demonstrated in a laboratoryscale microgrid.

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“…Another series-parallel-connected CFC structure can be found in [63], where a DAB is also used as a parallel-connected DC/DC converter.…”

Section: Series-parallel-connected Cfcsmentioning

confidence: 99%

DC current flow controllers for meshed HVDC grids

Bassols¹

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Meshed High Voltage Direct Current (HVDC) grids are seen as solution to transmit and exchange high amounts of power across long distances or using submarine cables with high levels of flexibility and redundancy. Also, they can be especially suitable to integrate offshore energy resources such as offshore wind power plants. This thesis focuses on the DC Current Flow Controllers (CFC) for meshed HVDC grids. The CFCs are being thought as power electronics based devices that may be installed in future meshed HVDC grids to aid in the current flow regulation. The concept is similar to Flexible Alternating Current Transmission Systems (FACTS) but applied to HVDC grids. First, an overview of the different CFC concepts proposed in the literature is presented. Then, the modelling and control of a DC/DC CFC converter is developed and the benefits of installing it in a meshed HVDC grid are analysed. The functionality of the previous CFC is also integrated into a DC Circuit Breaker, in order to have a single device with both capability to interrupt DC faults and provide DC current regulation. Afterwards, an interline DC/DC CFC topology is proposed, which has the advantage of a simplified converter structure. It is validated using dynamic simulations and a prototype is built and tested in a meshed DC grid experimental platform. A single CFC may not be enough to regulate the current flows in complex meshed HVDC grids, thus, this work also considers the concept of Distributed CFCs (DCFC) in a meshed HVDC grid, which are being operated selectively, allowing more flexibility when regulating the current flows. Also, multiple lines can be connected to a certain HVDC node. Therefore, the proposed CFC is extended to be connected to any number of HVDC lines and so, be able to control the current circulating through any of them. The obtained multi-port CFC is validated through simulations. Other devices can help to the current regulation in meshed HVDC grids, for example already installed DC/DC converters that adapt the different voltages of the HVDC systems. A transformerless DC/DC topology is analysed in this work and the design of its AC filter addressed. Finally, taking into account that some HVDC links based on Line Commutated Converters (LCC-HVDC) are installed near to potential offshore wind power resources, this work studies the operation and control of a Current Source Converter (CSC) based tapping station connected in series with the HVDC link to integrate offshore wind power. Les xarxes d'alta tensió mallades en contínua, meshed High voltatge Direct Current (HVDC) grids, es presenten com una solució per transportar grans quantitats d'energia a través de llargues distàncies o mitjançant cables submarins amb alts nivells de flexibilitat i redundància. També, són especialment adequades per la captació d'energia de parcs eòlics marins. Aquesta tesi se centra en els controladors del flux de corrent, Current Flow Controllers (CFC), per a xarxes HVDC mallades. Els CFC es plantegen com dispositius d'electrònica de potència que es podrien instal·lar en les futures xarxes HVDC mallades per tal d'ajudar en la regulació dels fluxos de corrent de les línies. Aquest concepte és similar als dispositius FACTS (Flexible AC Transmission Systems), però aplicat a xarxes HVDC. Primer, es realitza un recull de les diferents propostes de CFCs a la literatura. Després, es modelitza i es dissenya el control d'un convertidor DC/DC CFC i s'analitzen els beneficis d'instal·lar-lo en una xarxa HVDC mallada. La funcionalitat de l'anterior CFC s'inclou en els interruptors de contínua, DC Circuit Breakers (DCCB), per tal de tenir un dispositiu amb capacitat d'interropre faltes DC i també controlar corrents. A continuació, es proposa una topologia de CFC simplicada, que es valida per mitjà de simulacions i se'n construeix un prototip que es prova experimentalment al laboratori. Un únic CFC pot no ser suficient per a controlar els fluxos de corrent en xarxes HVDC mallades d'una certa complexitat. És per això, que també s'introdueix el concepte de CFCs distribuïts en diferents nodes de la xarxa i que s'operen de forma selectiva. Vàries línies HVDC poden estar connectades a un node, per aquest motiu, la topologia de CFC anteriorment presentada s'actualitza per tal de poder ser connectada a un nombre qualsevol de línies. La topologia multi-port obtinguda es valida per mitjà de simulacions. Altres dispositius que poden ajudar a controlar els fluxos de corrent són els propis convertidors DC/DC que s'encarreguen d'adaptar la tensió dels sistemes HVDC. S'analitza també un convertidor DC/DC sense transformador AC i es realitza el disseny del seu filtre AC. Finalment, algunes de les línies HVDC basades en tecnologia Line Commutated Converter (LCC) es troben a prop de zones amb energia eòlica potencial. Per aquest motiu, s'estudia l'operació i control d'un convertidor Current Source Converter (CSC) que actua com una estació de tapping per tal d'injectar l'energia d'un parc eòlic marí a la línia LCC-HVDC.

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A DC power flow controller and its control strategy in the DC grid

Cited by 15 publications

References 8 publications

Low-Voltage dc System Building Blocks: Integrated Power Flow Control and Short Circuit Protection

Low-Voltage dc System Building Blocks: Integrated Power Flow Control and Short Circuit Protection

Partially Rated Power Flow Control Converter Modeling for Low-Voltage DC Grids

DC current flow controllers for meshed HVDC grids

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