Analytical averaged loss model of three-phase T-type STATCOM with virtual zero level modulation

Wang, Jun; Yuan, Xibo; Zhang, Yonglei; Dagan, Kfir J.; Liu, Xu; Drury, David; Mellor, P.H.; Bloor, Andrew

doi:10.1109/ecce.2017.8096897

Cited by 6 publications

(11 citation statements)

References 13 publications

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“…As the third degree of freedom, utilizing redundant output voltage levels within one switching window has been exploited in recent studies for the voltage balancing of various topologies, e.g. [6], [13], [14]. Following this principle, [5] proposed an special modulation technique to achieve the voltage balancing of the middle capacitor in a 4-level NPC converter.…”

Section: B Limitations Of the Existing Voltage-balancing Methodsmentioning

confidence: 99%

“…3, introducing the redundant voltage level leads to additional switching transitions and associated switching losses. In [13], the RLM is implemented in a three-level T-type converter and the analysis shows that the switching losses can increase significantly due to the additional switching transitions. But, the increase of switching loss can be moderated by applying a lower switching frequency or applying Wide Bandgap (WBG) power devices with ultra-low switching losses.…”

Section: Merits/drawbacks Of the Proposed Schemementioning

confidence: 99%

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Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Wang

Yuan

Jin

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

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A four-level π-type converter is a Neutral Point Clamped (NPC) multilevel converter topology for low/medium voltage applications. As the inherent issue with this topology, the DC-link capacitor voltage balancing is challenging, especially when it operates as a single-end inverter/rectifier with unity power factor. This paper proposes a closed-loop DC-link voltage balancing algorithm of a π-type converter that is effective and simple to implement. In principle, this approach is based on Redundant Level Modulation (RLM). The RLM utilizes additional voltage levels in each switching window to gain extra controllability of the DC-link capacitor voltages without affecting the average output voltage. An algorithm based on mathematical and logical operations is developed to utilize RLM to achieve the closed-loop voltage balancing. The proposed control method is effective over the full modulation index (M = 0 ~ 1.15) and full power factor range (cos φ = 0 ~ 1). The algorithm is implemented in a test rig, and the experiment confirms its effectiveness.

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Section: B Limitations Of the Existing Voltage-balancing Methodsmentioning

confidence: 99%

Section: Merits/drawbacks Of the Proposed Schemementioning

confidence: 99%

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Wang

Yuan

Jin

et al. 2019

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…This limitation becomes problematic for certain applications, such as Static Synchronous Compensators (STATCOM) since they mainly operate at low power factors. The other approach is the Virtual Zero-level Modulation (VZM) [15] which utilizes redundant voltage levels in each switching window. The VZM is effective in eliminating the low frequency oscillations at low power factors and high modulation indexes.…”

Section: Hree-level Converters Such As Three-level Neutralmentioning

confidence: 99%

“…With regard to utilizing the redundant voltage level, VZM is equivalent to the Nearest Three Virtual Vector (NTV 2 ) modulation [4], [8], Partial Bipolar PWM (PDPWM) [16], Disassembly of Zero Level [13], Double Signal PWM (DSPWM) [17], and the modulation strategies in [9], [12]. However, the main drawback of this technique is introducing extra switching events, which leads to significantly increased switching loss of the switching devices [9], [15]. Therefore, it is undesirable to activate VZM constantly, especially when ZSI is capable already to balance the NP voltage in certain cases.…”

Section: Hree-level Converters Such As Three-level Neutralmentioning

confidence: 99%

Optimal Neutral-Point Voltage Balancing Algorithm for Three-Phase Three-Level Converters With Hybrid Zero-Sequence Signal Injection and Virtual Zero-Level Modulation

Wang

Yuan

Dagan

et al. 2020

IEEE Trans. on Ind. Applicat.

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This paper presents an optimal carrier-based voltage balancing scheme for three-phase, three-level converters. The proposed scheme utilizes two available degrees of freedom, i.e. Zero-sequence Signal Injection (ZSI) and Virtual Zero-level Modulation (VZM), to eliminate the low-frequency neutral point voltage oscillation. It is universally effective over the full power factor and modulation index range and easy to implement in digital controllers. The hybrid algorithm combines the merits of both approaches, which offers the optimal performance regarding controllability, switching device power losses and output harmonics. The main drawbacks of VZM, i.e. the increased switching loss and high-frequency harmonics due to additional switching transitions, have been minimized in the proposed scheme. The performance of the proposed scheme is evaluated through simulation and experiment.

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“…The analytical expression of the conduction losses can also be expressed in an alternative way in the case when the transistor is in conduction: [2,14,15].…”

Section: Conduction Lossesmentioning

confidence: 99%

Comparative study of semiconductor power losses between CSI-based STATCOM and VSI-based STATCOM, both used for unbalance compensation

Benslimane

Bouchnaif

Essoufi

et al. 2020

Prot Control Mod Power Syst

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In this paper, we present a detailed procedure to determine the semiconductor losses for both structures of a shunt STATCOM (Static Compensator), STATCOM based on Current Source Inverter (CSI) and STATCOM based on Voltage Source Inverter (VSI), both used for voltage unbalance compensation. As a first step, we study the VSI-based STATCOM and the CSI-based STATCOM used in high speed railway substations. Then we analyze the design and the sizing of the unbalance compensator in order to obtain an unbalance factor that does not exceed the limits imposed by the standards or by the energy provider. Following that, we compare the performances obtained with both structures VSI-STATCOM and CSI-STATCOM, after calculating the semiconductor power losses in the STATCOM converters. Finally, we validate our approach by simulation over real data of unbalance compensation caused by the new high-speed railway in Morocco. We use the tools MATLAB / Simulink/Simpowersys for performing our simulations.

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Analytical averaged loss model of three-phase T-type STATCOM with virtual zero level modulation

Cited by 6 publications

References 13 publications

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Closed-loop DC-link Voltage Balancing Algorithm for a Four-level π-type Converter

Optimal Neutral-Point Voltage Balancing Algorithm for Three-Phase Three-Level Converters With Hybrid Zero-Sequence Signal Injection and Virtual Zero-Level Modulation

Comparative study of semiconductor power losses between CSI-based STATCOM and VSI-based STATCOM, both used for unbalance compensation

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