Type tests on MMC-based HVDC valve section with synthetic test circuits

Tang, Guangfu; He, Zhiyuan; Zha, Kunpeng; Luo, Xiang; Wu, Yanan; Gao, Chong; Wang, Haitian

doi:10.1002/etep.2190

Cited by 5 publications

(11 citation statements)

References 7 publications

(5 reference statements)

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“…The power and voltage levels of the solution are very high and the laboratory requirements for validation are complex and expensive. A methodology was proposed in [22] based on synthetic tests for thyristor valves used in high-voltage direct current (HVDC) systems, and [23] applied the methodology to modular multi-level converters (MMC) also in HVDC application. The synthetic tests validated the ability of the power semiconductors to support the same electrical stress of the real application.…”

Section: Testingmentioning

confidence: 99%

“…Based on [22,23], the purpose of the test is to validate the electric isolation, blocking voltage, and current conduction capabilities of the AC static switch. The process starts with the test of thyristor basic modules, then thyristor stacks, and finally AC static switch, and the test sequence is as follows: isolation, voltage blocking, and current conduction.…”

Section: Functionality Tests Of Power Electronicsmentioning

confidence: 99%

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Medium-Voltage AC Static Switch Solution to Feed Neutral Section in a High-Speed Railway System

et al. 2018

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A high-speed train (HST) is a single-phase load supplied by a three-phase AC grid. The HST produces unbalanced three-line currents affecting the power quality of the grid. To balance the asymmetries on average, railway feeding sections are supplied that rotate the three phases of the grid. An electric isolation segment, called the neutral section (NS), between different sections is necessary. The HST must pass through this 1.6 km NS without power supply. In this paper, a medium-voltage AC static switch solution to feed the high-speed train in the NS is proposed. Thyristor technology is selected to design the 25 KVAC static switch. A medium-voltage power electronics procedure design is proposed to ensure proper operation in the final application. An NS operation is analyzed to identify impacts within the electric system and solution requirements are developed. Then, a low-scale prototype is used to experimentally validate the solution based on thyristor technology and the medium-voltage AC static switch is designed. Limitations on power and voltage at the Mondragon University Medium-Voltage Laboratory do not allow testing of the AC static switch at nominal conditions. A partial test procedure to test sections of the AC static switch is proposed and applied to validate the solution. Finally, experimental results for the Cordoba–Malaga (Spain) high-speed railway in real conditions with an HST crossing the NS at 300 km/h are shown.

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Section: Testingmentioning

confidence: 99%

Section: Functionality Tests Of Power Electronicsmentioning

confidence: 99%

Medium-Voltage AC Static Switch Solution to Feed Neutral Section in a High-Speed Railway System

et al. 2018

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“…Generally, the modulation methods can be classified into two kinds: pulse width modulation (PWM) and staircase modulation. Pulse width modulation is based on the control of every submodule capacitor voltages by means of different modulation approaches . Staircase modulation is based on sorting method to control submodule voltages .…”

Section: Introductionmentioning

confidence: 99%

“…Pulse width modulation is based on the control of every submodule capacitor voltages by means of different modulation approaches. [12][13][14] Staircase modulation is based on sorting method to control submodule voltages. [15][16][17][18] One of the most commonly used staircase modulations is nearest-level modulation (NLM).…”

Section: Introductionmentioning

confidence: 99%

An enhanced level-increased nearest level modulation for modular multilevel converter

Zhu

Lei

et al. 2018

Int Trans Electr Energ Syst

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Summary An enhanced level‐increased nearest level modulation (eNLM) method is proposed to improve the performance of modular multilevel converter (MMC) with relatively small number of submodules. The eNLM method can almost double the level number of ac output voltage, compared with conventional NLM. Consequently, the ac output voltage quality of the MMC using eNLM is significantly enhanced. The proposed method inherits the advantages of the conventional NLM such as simple implication and low switching loss and avoids the disadvantages of the existing improved NLM method such as increasing in submodule capacitor voltage ripple amplitude and voltage offset, arm inductor voltage peak, complexity in topology, etc. PSCAD/EMTDC simulation results confirmed the effectiveness of the proposed method.

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“…Moreover, switching frequency and transient peak voltages on IGBT devices are lower in MMCs, which reduces converter losses. 8,9 Over the few recent years, various control strategies have been investigated which can be decomposed into 2 control levels. The first is called low-level control.…”

Section: Introductionmentioning

confidence: 99%

Global advanced control strategy for Modular Multilevel Converter integrated in a HVDC link

Ayari

Belhaouane

Guillaud

et al. 2018

Int Trans Electr Energ Syst

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Modular Multilevel Converter (MMC) is becoming a promising converter technology for high-voltage direct current transmission systems due to its high modularity, availability, and power quality. It is a multi-input-multi-output nonlinear system. The control system for MMC is required to simultaneously achieve multiple control objectives. Existing control strategies for MMC are complex and the controller parameter design is not straightforward for the nonlinear systems with highly coupled states. In view of this, a steady-state model for the MMC is developed on bilinear deviation state-space model around a working point. Based on linear quadratic regulator and least squares methods, a nonlinear polynomial feedback law is designed to simultaneously control the grid and differential currents, and the global stored energy and energy balancing between total upper and lower arms. To generate the optimal current references, a multivariable linear quadratic controller is used to regulate the total energy per leg, energy difference between each upper and lower arms, and the DC bus voltage. The proposed high-level controller depicts an original advanced control structure of MMC converter. The performance of the proposed strategy for a detailed model of 400-level MMC is evaluated using simulations in MATLAB/SIMULINK/SPS software environment. KEYWORDSbilinear model, LQR approach, Modular Multilevel Converter (MMC), energies and DC voltage control, polynomial control Int Trans Electr Energ Syst. 2018;28:e2511. wileyonlinelibrary.com/journal/etep

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Type tests on MMC-based HVDC valve section with synthetic test circuits

Cited by 5 publications

References 7 publications

Medium-Voltage AC Static Switch Solution to Feed Neutral Section in a High-Speed Railway System

Medium-Voltage AC Static Switch Solution to Feed Neutral Section in a High-Speed Railway System

An enhanced level-increased nearest level modulation for modular multilevel converter

Global advanced control strategy for Modular Multilevel Converter integrated in a HVDC link

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