Mission Profile Emulator for Sub-Modules of Modular Multilevel Converter with Resonant Filter Impedance

Li, Enyi; Ma, Ke

doi:10.23919/ipec-himeji2022-ecce53331.2022.9807070

Cited by 2 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to (14), the test current is a hybrid of AC and DC components. To accurately control the AC component of the test current, a quasi-resonant controller is used in the current controller.…”

Section: B Control Methods For the Test Module Group 1) Based On The ...mentioning

confidence: 99%

“…The Hbridge structure with upper and lower arms along with a DC bus produces better equivalent test stresses [10], however, more inductors are required in the test circuit. The test topology based on drag and H-bridge proposed by scholars can simultaneously test the stresses of the module under rectifier and inverter operating conditions, but this test topology is not capable of larger current operation tests [11]- [14]. Based on the idea of a synthetic operation test, General Electric proposed the full-bridge array equivalent test device, which has good stress equivalence and reduces the number of inductors but requires a large number of fullbridge modules [15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Topology and Control Method for Operational Testing of ±800 kV/8 GW Flexible DC Transmission Modular Multilevel Converter Valve

Liu,

Chen,

Liu

et al. 2024

IEEE Access

View full text Add to dashboard Cite

Due to the relatively low operational reliability of the MMC valve, it is necessary to establish corresponding test methods to examine the tolerance of the valve to electrical and thermal stresses under engineering requirements through operational tests, in order to verify its operational reliability. To meet the operational testing requirements for higher voltage and larger current converter valves, an appropriate test topology is required. The paper first analyzes the voltage and current stress characteristics of capacitor components and MMC converter valves in ±800kV/8GW Flexible DC transmission system, providing a theoretical basis for the stress of operational testing valve, requiring that to be equivalent to actual operating conditions. Addressing the operational testing demands for high voltage and large current converter valves in the ±800kV/8GW flexible DC transmission MMC, a test topology is proposed. This topology can meet the operating conditions of higher voltage and larger current and simultaneously conduct tests on valve segments and modules, significantly improving operational testing efficiency and reducing testing costs. Additionally, a control method applicable to this test topology is proposed, enabling flexible adjustment of DC and AC in the test circuit, thereby enhancing the equivalency of operational tests. In this paper, the proposed topology and control method have enhanced the testing efficiency, reduced testing costs, improved testing equivalence, and enhanced the precision of current and capacitor voltage control. Finally, simulation and experiments are constructed to validate the feasibility and effectiveness of the proposed operational test topology and its control method through simulations and experiments.INDEX TERMS Flexible DC transmission, modular multilevel converter, operation test, current control

show abstract

Section: B Control Methods For the Test Module Group 1) Based On The ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Topology and Control Method for Operational Testing of ±800 kV/8 GW Flexible DC Transmission Modular Multilevel Converter Valve

Liu,

Chen,

Liu

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

“…However, the fault current rises sharply after a few milliseconds of fault occurs, which increases the difficulty of DCCBs' breaking capability. The larger the breaking current of DCCB, the more power electronic devices and the higher the construction cost are required [27][28][29][30], and the complexity of equipment design is increased.…”

Section: Introductionmentioning

confidence: 99%

Study of Energy Flow Mechanisms in High Power Device Converters

Zhao,

Jin,

et al. 2024

Energies

View full text Add to dashboard Cite

The work in this paper is applied to the Zhangbei Power grid. In the flexible direct current (DC) power system, the fault current rises extremely fast when a DC fault occurs. The requirements for the peak of breaking current and fault energy absorption of DC circuit breakers (DCCBs) increase linearly, which significantly increases the cost of the equipment. Therefore, in order to reduce the design difficulty of DCCBs, this paper proposes a strategy to control energy after the fault occurs. Firstly, the energy dimension is added on the basis of the traditional vector control of MMC, which constitutes a three-dimensional energy direct control. Subsequently, the architectures of energy fluctuation control and feedforward control are proposed. The influencing mechanisms for the peak fault current, peak fault voltage and energy dissipation are analyzed. Finally, the simulation of energy fluctuation control and feedforward control is constructed on PSCAD/EMTDC. The simulation results show that the energy fluctuation control is obviously better than the conventional three-dimensional energy control, and the feedforward energy control is further improved on this basis. Compared with the conventional vector control, the peak energy is reduced by 45.43% and the peak current is reduced by 25.39%, which helps to simplify the equipment design and reduce the equipment cost.

show abstract

Mission Profile Emulator for Sub-Modules of Modular Multilevel Converter with Resonant Filter Impedance

Cited by 2 publications

References 12 publications

A Topology and Control Method for Operational Testing of ±800 kV/8 GW Flexible DC Transmission Modular Multilevel Converter Valve

A Topology and Control Method for Operational Testing of ±800 kV/8 GW Flexible DC Transmission Modular Multilevel Converter Valve

Study of Energy Flow Mechanisms in High Power Device Converters

Contact Info

Product

Resources

About