Control and Performance of a Medium-Voltage Transformerless Cascade PWM STATCOM with Star-Configuration

Yoshii, Tsurugi; Inoue, Shozo; Akagi, Hirofumi

doi:10.1109/ias.2006.256767

Cited by 33 publications

(18 citation statements)

References 20 publications

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“…If v eonv is a positive voltage between the levels Vj and Vj+1 , then q1 = ... =qj =1 , qj+2 =···=q8 =0. Solving (6) and (7) with the description ofdiscrete-time variables, with the initial conditions ik and Vci(k)' i = 1, ...,8 , gives the approximate ac-side current ik+1 and capacitor voltages V c i(k+1) , i =1,...,8 at t =tk+1 as (8). Where (11) III.…”

Section: --Ts --Oj-z)/(e Rc V C J+1(k))mentioning

confidence: 99%

“…3) For the same power capability, the cascade converter requires less number of power components such as switches and diodes. The modulation methods presented for the cascade multilevel converter can be classified into staircase modulation [3]- [5], phase-shifted sinusoidal pulsewidth modulation [6]- [8] and multi-pulse optimal pulsewidth modulation [9], [10]. With the staircase modulation the converter switches operate at lower frequency.…”

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confidence: 99%

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Voltage balancing technique with low switching frequency for cascade multilevel active front-end

Alizadeh

Farhangi

2007

2007 7th Internatonal Conference on Power Electronics

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Recently cascade multilevel converters have attracted the attention of researchers for medium voltage applications such as FACTs devices and motor drives. This topology consists of several H-bridge cells in series, which has the advantages of modular structure and reduced number of com ponents. The main challenges in these applications are limitation of switching frequency of semiconductor devices, low harmonic distortion requirement of grid current and balancing problems of the isolated dc-links. In this paper a new modulation method is proposed which produces low current distortion with low switching frequency. The balancing of the capacitors is well established, and the system has fast dynamic response. The method is simple and effective. Simulation results show the feasibility and superiority of the proposed method.

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Section: --Ts --Oj-z)/(e Rc V C J+1(k))mentioning

confidence: 99%

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confidence: 99%

Voltage balancing technique with low switching frequency for cascade multilevel active front-end

Alizadeh

Farhangi

2007

2007 7th Internatonal Conference on Power Electronics

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“…Cascaded multi-level converter has a lower output of waveform harmonic content, save more switching devices and has a more simple control system than other kinds of multi-level converter. Moreover its H-bridge modules have a compact structure, flexible configuration and reliable performance [8]- [10]. So the cascaded multi-level structure is used as converter topology of STATCOM in this paper.…”

Section: Introductionmentioning

confidence: 99%

The simulation research of STATCOM based on cascaded multi-level converter

Liang

Chen

et al. 2011

2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

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Cascaded multi-level converter based STATCOM (CMC-STATCOM), with a topology of modular-cascaded structure, has a wide prospect of applications in both transmission and distribution system. Under the background of application of STATCOM in high voltage power grid, there are many advantages of CMC-STATCOM compared with other kinds of STATCOM. On the basis of mathematical model of main topology, the states feedback decoupled reactive power control strategy based on the d-q coordinate system is studied in this paper, together with the application principle of carrier phase shift PWM modulation method in CMC. The balance of DC bus voltage is a key factor to the stable operation of devices. In this paper, the hierarchical control method is used to achieve a balance of DC bus voltage, and it involves the DC bus voltage overall control and individual control of each cascade module. At last, the simulation results of 10-kV, 1-MVA CMC-STATCOM verify the correctness and effectiveness of the control strategy and modulation method in this paper using PSCAD/EMTDC.

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“…There are a number of reasons for this, but the main one is that it is feasible to obtain a large number of levels with this topology [1], [2]. With alternative topologies the level numbers are constrained by component number and capacitor voltage balance issues [3]. The increased number of levels achievable with the H-bridge multi-level converter also allows greater switching redundancy, which creates more flexibility in terms of the ability to trade-off between harmonic performance, switching losses and voltage balancing.…”

Section: Introductionmentioning

confidence: 99%

“…Initially the desired output voltages for each phase are calculated in the dead-beat current controller. The 'MPC' block then evaluates the corresponding voltage vector for each switching combination using (3).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom

Townsend

Summers

Vodden

et al. 2013

IEEE Trans. Power Electron.

123

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract-This paper further develops a Model Predictive Control (MPC) scheme which is able to exploit the large number of redundant switching states available in a multi-level H-bridge StatCom (H-StatCom). The new sections of the scheme provide optimised methods to trade off the harmonic performance with converter switching losses and capacitor voltage ripple. Varying the pulse placement within the modulation scheme and modifying the heuristic model of the voltage balancing characteristics allows the MPC scheme to achieve superior performance to that of the industry standard phase shifted carrier modulation technique. The effects of capacitor voltage ripple on the lifetime of the capacitors is also investigated. It is shown that the MPC scheme can reduce capacitor voltage ripple and increase capacitor lifetime. Simulation and experimental results are presented that confirm the correct operation of the control and modulation strategies.

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Control and Performance of a Medium-Voltage Transformerless Cascade PWM STATCOM with Star-Configuration

Cited by 33 publications

References 20 publications

Voltage balancing technique with low switching frequency for cascade multilevel active front-end

Voltage balancing technique with low switching frequency for cascade multilevel active front-end

The simulation research of STATCOM based on cascaded multi-level converter

Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom

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