Control and Design for Mission Profile Emulator of Individual Submodule in CPS-PWM-Based Modular Multilevel Converter

Ma, Ke; Li, Enyi; Yang, Yi; Cai, Xu

doi:10.1109/jestpe.2020.3037815

Cited by 21 publications

(3 citation statements)

References 35 publications

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“…Ref [19]- [20] proposed an operational test control strategy based on closed-loop to realize the control of capacitor voltage and test current. Ma [21] accurately controls the test current through a PR controller, and module capacitor voltage equalization is achieved through a PI controller, but with the increase in the number of modules under test, the number of PI controllers used for capacitor voltage equalization is high. In summary, the main factors that make the existing test topology applications difficult and constraining under high voltage and larger current applications are poor stress equalization, test cost, and control flexibility.…”

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

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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

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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

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show abstract

“…Insulated gate bipolar transistor (IGBT) modules, as fully controlled devices with high current conduction capability, have been widely used in the power transmission [1][2][3][4] and the new energy grid connection [5][6][7]. The failure of the converters could lead to serious impact on the safe operation of power grid.…”

Section: Introductionmentioning

confidence: 99%

A direct bonding copper degradation monitoring method for insulated gate bipolar transistor modules: Boundary‐dependent thermal network combined with feedback control

Zhang

Cheng

et al. 2023

High Voltage

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The direct bonding copper (DBC) substrates of insulated gate bipolar transistor (IGBT) modules degrade inevitably under cycling thermo‐mechanical stress, causing potential threat to the reliability of IGBT modules. However, little attention has been paid to monitoring their degradation. This paper proposes a DBC degradation monitoring method for IGBT modules, which combines boundary‐dependent thermal network and feedback control. A thermal network is employed to describe the internal material degradation of IGBT modules and can be extracted from a finite‐element method model. The boundary conditions including power losses and DBC degradation are considered, enabling the thermal network suitable for various working conditions and different DBC degradation conditions of IGBT modules. The DBC degradation is characterised by its equivalent thermal conductivities measured in the thermal cycling ageing experiments. On the basis of the boundary‐dependent thermal network, feedback control is applied to monitor DBC degradation by regulating boundary‐dependent thermal impedances. Finally, the proposed model is verified from the effectiveness and accuracy of DBC degradation monitoring and junction temperature calculation. This method casts new light on thermal network modelling and could provide a feasible method for the monitoring of DBC degradation.

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“…Currently, multiple modulation methods have been proposed to achieve the stability control of MMC, such as Nearest level modulation [12], Selective harmonic eliminated pulse width modulation (PWM) [13], Carrier Phase‐Shifted pulse width modulation (CPS‐PWM) [14] and Space vector pulse width modulation (SVPWM) [15]. As a superior modulation method, SVPWM directly controls the line voltage.…”

Section: Introductionmentioning

confidence: 99%

Space vector pulse width modulation strategy for modular multilevel converters in power system

Zhenhong

Xiong

et al. 2023

IET Cyber-Phy Sys Theory & Ap

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As a superior modulation strategy, space vector pulse width modulation (SVPWM) provides redundant voltage vectors and adjustable action time, which can achieve multi‐objective control of modular multilevel converter (MMC). An SVPWM strategy suitable for MMC is proposed. The strategy is divided into three stages. In the first stage, the appropriate voltage vector, the action time and the basic sub‐module (SM) input number are quickly calculated to ensure the output quality by equating MMC as a 2‐level inverter. In the second stage, a finite set of the circulating current suppression is established on the basis of the basic SM input number. The optimal SM input number is selected through rolling optimisation. In the last stage, according to the SM voltage sorting and the optimal SM input number, the optimal switching state is determined to realise the SM voltage balance control. The proposed control strategy simplifies the design of the control system, reduces the computational burden and can be easily extended to MMC with any SM number. The simulation and experimental results show that the proposed SVPWM strategy can reduce the circulating current and balance the SM capacitor voltage while ensuring the output quality.

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Control and Design for Mission Profile Emulator of Individual Submodule in CPS-PWM-Based Modular Multilevel Converter

Cited by 21 publications

References 35 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

A direct bonding copper degradation monitoring method for insulated gate bipolar transistor modules: Boundary‐dependent thermal network combined with feedback control

Space vector pulse width modulation strategy for modular multilevel converters in power system

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