Fault-Tolerant Operation of the DC/DC Modular Multilevel Converter Under Submodule Failure

Razani, Ramin

doi:10.1109/jestpe.2021.3050122

Cited by 14 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, it has a lower capacitor voltage ripple percentage than the methods proposed in [4] and [12]. The methods proposed in [13] and [14] have a smaller capacitor voltage ripple percentage than the proposed method. However, this difference is very small.…”

Section: Performance Comparisonmentioning

confidence: 92%

“…If an HBSM fails, the proposed controller increases the V c values by the amount defined in (13) to complete the transition to FT operation. To maintain V Σ cu,i and V Σ cl ,i at V dc after M HBSM failures, V c should be increased to V dc ∕(N − M ) requiring larger capacitors.…”

Section: Proposed Mpc-based Strategy For Circulating Current Controlmentioning

confidence: 99%

“…Moreover, it fails to maintain the output power of the MMC when there is a higher number of failed SMs. An FT control scheme for modular multilevel DC/DC converters is proposed in [13]. However, this method significantly increases the capacitor voltage ripples after SM failures and has a longer settling time.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fast and fault‐tolerant model predictive control of MMCs under selective harmonic elimination

Mohammadhassani

Mehrizi‐Sani

2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

Selective harmonic elimination (SHE) is a suitable pulse‐width modulation (PWM) technique for some applications of modular multilevel converters (MMC) with lower number of semiconductor submodules (SM). However, SHE can make it difficult to control circulating currents in the MMC. Moreover, the MMC is vulnerable to SM switch failures that reduce its output power magnitude and quality. This paper proposes a fault‐tolerant model predictive control strategy for MMCs operating with SHE (FT SHE‐MPC). The effects of switch failure on phase voltage waveforms are studied first. Then, a method is proposed to design the FT SHE waveform to preserve its harmonic performance. Next, the proposed FT SHE‐MPC is designed to increase the capacitor voltages during an SM failure to maintain the fundamental component of the faulty phase voltage and control the circulating currents, maintaining balance among line voltages and the output power of the MMC. Additionally, the proposed method offers as much as 60% faster FT transition time and as much as 36% lower capacitor voltage ripple. The advantages of the proposed method are verified through offline and real‐time simulation studies on a three‐phase nine‐level MMC in PSCAD/EMTDC software and RTDS.

show abstract

Section: Performance Comparisonmentioning

confidence: 92%

Section: Proposed Mpc-based Strategy For Circulating Current Controlmentioning

confidence: 99%

See 1 more Smart Citation

Fast and fault‐tolerant model predictive control of MMCs under selective harmonic elimination

Mohammadhassani

Mehrizi‐Sani

2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…Besides, the distributed controller reduces the risks of the single point of failure. In literature, most of the fault-tolerance and resiliency research are devoted to SM-level failure and redundancy [18]- [20] due to a higher failure rate of the SM components. However, it is critical to consider the failure of SM controllers.…”

Section: Modular Distributed Fault-tolerant Controllermentioning

confidence: 99%

Implementation of a Modular Distributed Fault-tolerant Controller for MMC Applications

Isik¹,

Burugula²,

Alharbi³

et al. 2022

Preprint

View full text Add to dashboard Cite

Centralized control algorithm limits the hardware flexibility of a Modular Multilevel Converter (MMC). Therefore, industrial MMC applications have started adopting distributed control structures. Even though distributed controller reduces a single point of failure risk compared to the centralized controller, the failure risk of the entire control systems increases due to the number of local controllers. However, the distributed controller can be programmed in such a way as to bypass the faulty local controller and take care of the power modules with the adjacent local controllers. This paper implements a modular distributed fault-tolerant controller for a scaled laboratory MMC prototype. Experimental results show that an MMC can operate without interruption, even under two local controller failures. Besides, the experimental results are verified with the Opal-RT, a real-time simulator with the same controller in a Control Hardware in Loop (CHIL) environment.

show abstract

“…In the literature, researchers have focused on increasing the resiliency of an MMC under SM-level failures, as the semi-conductor switches such as IGBTs or MOSFETs are more prone to open or short-circuit failures [18][19][20]. Therefore, various research methods are available to sustain the MMC operation under SM failure or shut down the system gracefully [21][22][23]. On the other hand, controller failure is not frequently expected as much, yet even unexpected latencies might cause a system failure.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a Modular Distributed Fault-Tolerant Controller for MMC Applications

et al. 2022

View full text Add to dashboard Cite

Centralized control algorithm limits the hardware flexibility of a modular multilevel converter (MMC). Therefore, distributed control structure has recently started to be seen in the industry application. Even though distributed controller reduces a single point of failure risk compared to the centralized controller, the failure risk of the entire control systems increases due to the number of local controllers. However, the distributed controller can be programmed in such a way as to replace the faulty local controller and sustain the MMC operation. In this paper, the distributed modular fault-tolerant controller is implemented in a laboratory-scale MMC prototype. The controller is built to control four SMs per phase for the proof-of-concept. Therefore, the MMC prototype is also built by two SMs per arm. The controller capability is validated with experimental and the Opal-RT result-time simulator results in a control-hardware-in-loop (CHIL) environment.

show abstract

Fault-Tolerant Operation of the DC/DC Modular Multilevel Converter Under Submodule Failure

Cited by 14 publications

References 32 publications

Fast and fault‐tolerant model predictive control of MMCs under selective harmonic elimination

Fast and fault‐tolerant model predictive control of MMCs under selective harmonic elimination

Implementation of a Modular Distributed Fault-tolerant Controller for MMC Applications

Implementation of a Modular Distributed Fault-Tolerant Controller for MMC Applications

Contact Info

Product

Resources

About