Modulation and Control for a New Hybrid Cascaded Multilevel Converter With DC Blocking Capability

Xue, Yusheng; Xu, Zheng; Tu, Qingrui

doi:10.1109/tpwrd.2012.2207743

Cited by 106 publications

(50 citation statements)

References 17 publications

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“…the voltage balance of the SM capacitors, is not ensured. In the MMC and the HCMC, sorting strategies [5,6,23] are used to balance the SM capacitor voltages and obtain operating states of SMs. In fact, in the MMC and the HCMC, the SMs inside one stack can produce the same voltage levels; thus, their capacitor voltages can be sorted together to determine the operating states of the SMs.…”

Section: Voltage Balancing Scheme Of Sm Capacitorsmentioning

confidence: 99%

“…As analyzed in [4] and [5], these converters fall into two distinct groups: the controllable switch converter, which consists of insulated-gate bipolar transistors (IGBTs) in series (such as the TLC and NPC); and the controllable voltage source converter, which consists of submodules (SMs) in series (such as the MMC). As a typical controllable voltage source converter, the MMC offers significant advantages over the controllable switch converter, such as high modularity, low dv/dt, low switching frequency and power loss, and reduced current harmonics [3,6].…”

Section: Introductionmentioning

confidence: 99%

“…However, in the symmetrical modulation scheme, the DSs in the HCMC switch at a higher frequency [18,19]; thus, the switching loss is higher than for the AAC. In [5] and [20], asymmetrical modulation methods for the HCMC are investigated to reduce the switching frequency and thereby the switching loss of the DSs. The asymmetrical modulation schemes are suitable for the HCMC for operation with a high modulation index but cannot be applied to the HCMC when the modulation index is lower than 2H3/p [5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

Wei

Jiang

et al. 2017

J. Mod. Power Syst. Clean Energy

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This paper proposes a novel hybrid multilevel converter with DC fault-blocking capability, i.e., the neutral-point clamped hybrid multilevel converter (NHMC). By employing two types of unipolar full-bridge submodules along with director switches, which are composed of seriesconnected insulated-gate bipolar transistors, the NHMC combines the features and advantages of the neutral-point clamped converter and the modular multilevel converter. The basic topology, operating principles, modulation scheme, and energy-balancing scheme of the NHMC are presented. The DC fault-blocking capability of the NHMC is investigated. The number of power electronic devices used by the NHMC is calculated and compared with other multilevel converters, showing that the proposed NHMC can be an economical and feasible option for medium-voltage DC transmission with overhead lines. Simulation results demonstrate the features and operating scheme of the proposed NHMC.

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Section: Voltage Balancing Scheme Of Sm Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

Wei

Jiang

et al. 2017

J. Mod. Power Syst. Clean Energy

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“…This may deviate the overall capacitor voltage of WSP from its reference value [17]. The existing methods proposed to resolve this issue are asymmetrical square wave modulation (ASWM) for DP [17], [21] and modulating the converter using third harmonic subtraction method [17], [22]. In this paper, the analysis for energy exchanged by WSP of HMMC-CFB is presented and a new technique is proposed to control the energy exchanged by WSP.…”

Section: Introductionmentioning

confidence: 99%

A new capacitor voltage balancing control for hybrid modular multilevel converter with cascaded full bridge

Ghat

Shukla

Mishra

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Recently, a hybrid modular multilevel converter with cascaded full bridges (HMMC-CFB) is proposed. This converter has mainly two parts: a director part (DP) and a wave shaping part (WSP). The DP consists of a conventional modular multilevel converter (MMC) with half bridge submodules (HBS). The WSP is a series connection of full bridge submodules (FBS) and attenuates the voltage harmonics produced by DP. The energy exchanged by WSP changes with modulation index and causes improper capacitor voltage regulation. For satisfactory operation of HMMC-CFB, the total capacitor voltage of WSP should remain constant. This paper presents an analysis of energy exchanged by WSP and proposes a new control technique to regulate the total dc voltage of WSP. In the proposed control, the energy exchanged by WSP is controlled by changing the slope of the voltage reference signal of DP. In addition, analysis of circulating current of HMMC-CFB is presented. A circulating current suppressing controller (CCSC) is used to control the second harmonic component. The performance of the proposed control technique for the standalone model of HMMC-CFB is evaluated by using time domain simulation studies in the PSCAD software environment. To test fault blocking capability of converter, a grid connected model is built in PSCAD and analyzed for dc fault tolerant capability.

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“…An alternate arm converter (AAC) topology [17] is a hybrid converter with FBSM-based MMC and two-level converter. The modulation and control strategies [19] of a new hybrid VSC with DC fault-tolerant capability called hybrid cascaded multilevel converter (HCMC) [18] are further studied. A new sub-module structure was also proposed [20].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Hybrid HVDC System with DC Fault Ride-Through and Commutation Failure Mitigation Capability

Guo¹,

Zhao²,

Peng³

et al. 2015

Journal of Power Electronics

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A hybrid HVDC system that is composed of line commutated converter (LCC) at the rectifier side and voltage source converter (VSC) in series with LCC at the inverter side is studied in this paper. The start-up strategy, DC fault ride-through capability, and fault recovery strategy for the hybrid HVDC system are proposed. The steady state and dynamic performances under start-up, AC fault, and DC fault scenarios are analyzed based on a bipolar hybrid HVDC system. Furthermore, the immunity of the LCC inverter in hybrid HVDC to commutation failure is investigated. The simulation results in PSCAD/EMTDC show that the hybrid HVDC system exhibits favorable steady state and dynamic performances, in particular, low susceptibility to commutation failure, excellent DC fault ride-through, and fast fault recovery capability. Results also indicate that the hybrid HVDC system can be a good alternative for large-capacity power transmission over a long distance by overhead line.

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Modulation and Control for a New Hybrid Cascaded Multilevel Converter With DC Blocking Capability

Cited by 106 publications

References 17 publications

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

A new capacitor voltage balancing control for hybrid modular multilevel converter with cascaded full bridge

Investigation of a Hybrid HVDC System with DC Fault Ride-Through and Commutation Failure Mitigation Capability

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