Enhanced equivalent model of the Modular Multilevel Converter

Ajaei, Firouz Badrkhani; Iravani, Reza

doi:10.1109/pesgm.2015.7285600

Cited by 18 publications

(33 citation statements)

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“…As MMCs typically use hundreds of SMs per arm in HVDC application, it is a burden to simulate the whole system using detailed switching models. To reduce computation time and accelerate the simulation, average models are used to evaluate MMC performance in normal operation and during a dc fault [33][34][35]. It is demonstrated in [33][34][35] that improved average models are applicable to pole-to-pole dc fault studies, with high accuracy.…”

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

“…3, uses 6 capacitors for the MMC and can represent the MMC behavior accurately under various operating conditions, including a pole-to-pole dc fault. Its derivation is based on the average models presented in [34][35][36][37] and the reference voltage and current for the controllable voltage and current sources and the IGBT switching logic are detailed in [36,37] and [34] respectively. The modified average model in Fig.…”

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

“…The copy of record is available at IEEE Xplore Digital Library. operation without compromising accuracy [34,35] and is adopted in this paper.…”

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

“…As only one capacitor C arm is used per arm in Fig. 3, SM capacitor voltage balancing is not considered in the average model [27,34,39,40]. By using a sorting algorithm, SM capacitor voltages during dc fault ride-through operation can be balanced in a detailed switching model [41][42][43].…”

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

See 3 more Smart Citations

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

Yao

et al. 2017

2017 IEEE Power &Amp; Energy Society General Meeting

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When a pole-to-pole dc fault occurs in a multiterminal HVDC system, it is desirable that the stations and dc solid-state transformers on healthy cables continue contributing to power transfer, rather than blocking. To reduce the fault current of a modular multilevel converter based dc solid-state transformer, active fault current control is proposed, where the dc and ac components of fault arm currents are regulated independently. By dynamically regulating the dc offset of the arm voltage rather than being set at half the rated dc voltage, the dc component in the fault current is reduced significantly. Additionally, reduced ac voltage operation of the dc solid-state transformer during the fault is proposed, where the ac voltage of transformer is actively limited in the controllable range of both converters in the transformer to effectively suppress the ac component of the fault current. The fault arm current peak and the energy absorbed by the surge arrester in the dc circuit breakers are reduced by 31.8% and 4.9% respectively, thereby lowering the capacities of switching devices and circuit breakers. Alternatively, with the same fault current level, the dc-link node inductance can be halved by using the proposed control, yielding lowered cost and volume. The novel active fault current control mechanism and the necessary control strategy are presented and simulation results confirm its feasibility.

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Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

“…The copy of record is available at IEEE Xplore Digital Library. operation without compromising accuracy [34,35] and is adopted in this paper.…”

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

Section: Modified Average Model Of Generic MMCmentioning

confidence: 99%

See 2 more Smart Citations

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

Yao

et al. 2017

2017 IEEE Power &Amp; Energy Society General Meeting

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“…A few simulation algorithms of MMC-HVDC have been proposed in [2]- [6]. While the simulation algorithm in [3] does not consider the blocked-state of the MMC submodules (SMs), the algorithms in [5], [6] are susceptible to numerical oscillations and inaccuracy while simulating the blocked-state of the SMs. The simulation algorithms in [2]- [6] use Dommel algorithm and model the devices like IGBTs, diodes, and thyristors with simple resistors or with voltagesources and resistors.…”

Section: Introductionmentioning

confidence: 99%

MMC-HVDC: Simulation and control system

Debnath

Madhusudhan

2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Simulation of modular multilevel converter (MMC) based high-voltage direct current (HVDC) systems assumes significance due to their growing popularity. It could assist with the design of hardware, control systems of MMC and HVDC networks, and power system topology. However, simulation of MMC-HVDC using existing software takes a long time due to the presence of a large number of states and non-linear devices. This paper presents an ultra-fast single-or multi-CPU simulation algorithm to simulate the MMC-HVDC system based on statespace models and using hybrid discretization algorithm with a relaxation technique that reduces the imposed computational burden. Using the developed simulation algorithm, a control system is developed for an MMC-HVDC system that reduces the switching losses in the system.

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Interoperability of different voltage source converter topologies in HVDC grids

Guo¹,

Rahman²,

Adam³

et al. 2019

15th IET International Conference on AC and DC Power Transmission (ACDC 2019)

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This paper presents a detailed study of DC grid operation using a range of user-defined offline and real-time HVDC converter models which were rigorously validated against offline and real-time benchmarks. Provided that these models are destined for use in real-time hardware in the loop simulation and a wide range of offline system studies, this paper assesses their suitability for studying complex DC grids that consist of multiple voltage source converters which differ in their control range and fault ride-through capabilities. Detailed quantitative studies show that the offline and real-time DC grid models produce well matched results and provide efficient approaches to investigate DC grid operation during normal condition and AC and DC faults.

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Enhanced equivalent model of the Modular Multilevel Converter

Cited by 18 publications

References 0 publications

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

Active control of DC fault currents in DC solid-state transformers during ride-through operation of multi-terminal HVDC systems

MMC-HVDC: Simulation and control system

Interoperability of different voltage source converter topologies in HVDC grids

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