On Comprehensive Description and Analysis of MMC Control Design: Simulation and Experimental Study

Zhang, Haibo; Belhaouane, Mohamed Moez; Colas, Frédéric; Kadri, Riad; Gruson, François; Guillaud, Xavier

doi:10.1109/tpwrd.2020.2977470

Cited by 18 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This ratio will vary considerably from, say an industrial system rated at 1000 MW with 500 SMs per arm each with a 2 kV DC link, to a 10 kW test rig with 10 SMs each at 100 V. It is evident that systems which aim to closely replicate fullscale converter dynamics (Type B) need careful design, see for example [35]. This design is further complicated for applications which aim to operate at low fundamental frequencies or if substantial reactive power is required.…”

Section: ) Sub-module Capacitorsmentioning

confidence: 99%

“…This provides a reasonable balance between inductor size, fault current limitation and inductive smoothing at the AC output terminals. In high power applications, the arm and grid side inductors are sized to limit the time-gradient (A/s) of the DC and AC fault currents [35] [56]. With few SMs, this inductance may also play a role in terms of filtering effect.…”

Section: ) Sub-module Capacitorsmentioning

confidence: 99%

“…The UoM system SMs are of standard Eurocard size (100 mm x 160 mm), ideal for mounting in a 19-inch server rack. Similar standardisation was undertaken in [35]. In contrast ICL designed compact PCBs and full custom mounting to enable small converter size (a key design limitation for the ICL implementation) but at the expense of considerable design effort.…”

Section: ) Specific Examplesmentioning

confidence: 99%

“…It is preferable to eliminate this gap through closed-loop control. For the UoL converter, the asymptotic stability provided by uncompensated modulation (UCM) [35] is used to converge the arm capacitor voltage to the DC link voltage. This is done in the third step, Fig.…”

Section: B Starting Procedures Of Cmc Test Rigmentioning

confidence: 99%

“…UCM is used to eliminate the gap between arm total capacitor voltage and the DC-link voltage. A CMC with UCM is asymptotically stable and arm voltages will converge to the DC-link voltage value [35]. The convergence time depends on the time constant of the buffer resistor and the total arm capacitor.…”

Section: B Starting Procedures Of Cmc Test Rigmentioning

confidence: 99%

See 4 more Smart Citations

Cascaded- and Modular-Multilevel Converter Laboratory Test System Options: A Review

et al. 2021

Self Cite

View full text Add to dashboard Cite

The increasing importance of cascaded multilevel converters (CMCs), and the sub-category of modular multilevel converters (MMCs), is illustrated by their wide use in high voltage DC connections and in static compensators. Research is being undertaken into the use of these complex pieces of hardware and software for a variety of grid support services, on top of fundamental frequency power injection, requiring improved control for non-traditional duties. To validate these results, small-scale laboratory hardware prototypes are often required. Such systems have been built by many research teams around the globe and are also increasingly commercially available. Few publications go into detail on the construction options for prototype CMCs, and there is a lack of information on both design considerations and lessons learned from the build process, which will hinder research and the best application of these important units. This paper reviews options, gives key examples from leading research teams, and summarizes knowledge gained in the development of test rigs to clarify design considerations when constructing laboratory-scale CMCs.

show abstract

Section: ) Sub-module Capacitorsmentioning

confidence: 99%

Section: ) Sub-module Capacitorsmentioning

confidence: 99%

Section: ) Specific Examplesmentioning

confidence: 99%

Section: B Starting Procedures Of Cmc Test Rigmentioning

confidence: 99%

Section: B Starting Procedures Of Cmc Test Rigmentioning

confidence: 99%

See 3 more Smart Citations

Cascaded- and Modular-Multilevel Converter Laboratory Test System Options: A Review

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

Interdependencies in HVDC grid protection: Impact of converter parameters and controls on DC fault‐ride‐through capabilities and protection system design

Düllmann

Brantl

Klein

et al. 2023

IET Generation Trans & Dist

View full text Add to dashboard Cite

For future multi-terminal HVDC networks, protection systems based on DC circuit breakers (DCCBs) are envisioned to limit the loss of power transmission towards AC grid(s). Yet, HVDC protection system design is considered a major challenge-especially in a multi-vendor setup. In particular, protection systems shall enable HVDC converters to ride through DC faults without protective blocking. Several studies have performed sensitivity analyses to determine the DCCB properties and current-limiting inductor properties that are required to enable converter fault-ride-through (FRT), but the HVDC converters themselves have been simplified and kept identical. However, in a multi-vendor setup, the exact converter design is not known at the time of DC protection planning. Therefore, this paper investigates the impact of different converter properties on the DC-FRT behaviour, and reveals implications on HVDC protection design. Firstly, analytical approaches are proposed to mathematically derive potential impact factors on the converters' FRT characteristics, also considering different converter control architectures. Secondly, a comprehensive EMT study demonstrates a significant impact of the converter parameters on the FRT behaviour. Analytical approaches and EMT results are compared with regard to limitations and applicability, such that the paper's findings can support the development of functional requirements for multi-vendor multi-terminal HVDC networks.

show abstract

Design of a Parallel All-DC Wind Power System With Turbine-Side Boost Based on a New DC Conversion

Han,

Li,

Wang

et al. 2024

IEEE Access

View full text Add to dashboard Cite

All-DC wind power system is one of the important directions of wind power development in the future, and its safe and reliable topology and stable control strategy are the key to the stable operation of the system. In order to solve the problems of poor control flexibility, difficulty of self-starting and low reliability of DC fault crossing in the current all-DC wind farm, this paper presented a topological structure of the parallel all-DC wind power system with turbine-side boost based on a new DC conversion. Based on the dynamic connection mode that each bridge arm of the new DC converter was charged in parallel on the low voltage side and discharged in series on the high voltage side, this paper designed the control strategy of the all-DC wind farm and analysed the operation mode of the all-DC wind farm in the steady state operation stage, the self-starting stage and the DC fault crossing period. Based on PSCAD/EMTDC, the simulation model of the parallel all-DC wind power system with turbine-side boost based on a new DC converter was established. Through the simulation of all-DC wind farm under normal operating conditions, such as steady state and dynamic operation, and fault conditions, such as dynamic cut-in and cut-out of faulty wind turbine and short circuit of DC bus, it was verified that the topology structure of the proposed parallel all-DC wind power system with turbine-side boost based on a new DC converter could improve the control flexibility, reduce the difficulty of self-starting, and ensure the high reliability of DC fault crossing under the premise of feasibility.INDEX TERMS All-DC wind power system, new DC converter, parallel, topological structure, control strategy.

show abstract

On Comprehensive Description and Analysis of MMC Control Design: Simulation and Experimental Study

Cited by 18 publications

References 19 publications

Cascaded- and Modular-Multilevel Converter Laboratory Test System Options: A Review

Cascaded- and Modular-Multilevel Converter Laboratory Test System Options: A Review

Interdependencies in HVDC grid protection: Impact of converter parameters and controls on DC fault‐ride‐through capabilities and protection system design

Design of a Parallel All-DC Wind Power System With Turbine-Side Boost Based on a New DC Conversion

Contact Info

Product

Resources

About