Integrated current control, energy control and energy balancing of Modular Multilevel Converters

Munch, Philipp; Görges, Daniel; Izák, Michal; Liu, Steven

doi:10.1109/iecon.2010.5675185

Cited by 146 publications

(100 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hence, the reference for the αβ components is The notch filters at fundamental frequency ensure that the controller outputs do not feature fundamental frequency components. This permits the cancellation at the dc terminals of the circulating currents, which is achieved by inducing reactive power flows in the other two phase-legs using the orthogonality principle in the matrix M [23].…”

Section: B Internal State Variable Control 1) Energy Control (Ec)mentioning

confidence: 99%

Modular Multilevel Converter Control Methods Performance Benchmark for Medium Voltage Applications

Christe

Dujić

2019

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

Abstract-Modular multilevel converters are increasingly being considered or used for various medium voltage applications. Multiple control methods have been proposed for the control of the direct to three-phase modular multilevel converter. They differ one from another in the way the capacitor voltage ripples are handled, i.e. either neglected, estimated, reconstructed by filtering or measured. This has implications on the performance level that can be obtained. This paper provides insights on the advantages and drawbacks of each control method, in inverter and rectifier mode, with a fair and thorough assessment supported by extensive simulations, with converter ratings that are realistic for medium voltage applications. Finally, this works highlights the impact of the higher dynamics for medium voltage dc applications compared to high voltage dc ones on the choice of the control method.

show abstract

Section: B Internal State Variable Control 1) Energy Control (Ec)mentioning

confidence: 99%

Modular Multilevel Converter Control Methods Performance Benchmark for Medium Voltage Applications

Christe

Dujić

2019

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…4, unlike the proposed controllers in [9], [20], and [32], none of the voltage or current components need to be transformed to the "dqo" frame and all of the computations can be performed in "abc" coordinates. This reduces the computational burden in the proposed controller and increases the speed of the computation.…”

Section: Proposed Controllermentioning

confidence: 99%

Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Shadlu¹

2017

Transactions on Electrical and Electronic Materials

View full text Add to dashboard Cite

The number of applications of solar photovoltaic (PV) systems in power generation grids has increased in the last decade because of their ability to generate efficient and reliable power in a variety of low installation in domestic applications. Various PV converter topologies have therefore emerged, among which the modular multilevel converter (MMC) is very attractive due to its modularity and transformerless features. The modeling and control of the MMC has become an interesting issue due to the extremely large expansion of PV power plants at the residential scale and due to the power quality requirement of this application. This paper proposes a novel control method of MMC which is used to directly integrate the photovoltaic arrays with the power grid. Traditionally, a closed loop control has been used, although circulating current control and capacitors voltage balancing in each individual leg have remained unsolved problem. In this paper, the integration of model predictive control (MPC) and traditional closed loop control is proposed to control the MMC structure in a PV grid tied mode. Simulation results demonstrate the efficiency and effectiveness of the proposed control model.

show abstract

“…The method of periodic discrete modeling and the PDLQR design are unified and characterized by easy expansion to other MMCC topologies. For example, the unified method is investigated and verified for the MMC in [11], [17]. Note that the obtained periodic control gain from the PDLQR can only regulate the state variables to the origin while minimizing the chosen cost function.…”

Section: Multivariable Optimal Control Designmentioning

confidence: 99%

“…A state feedback control for multivariable systems shows its advantages in handling the aforementioned problems. In [10] and [11], a complete multivariable design is developed to control the current variables, compensate the harmonics and balance the internal energy distribution for the MMC. The idea for this control design can be described briefly as: a linear multivariable model for the investigated system is required and a quadratic cost function J is defined based on the concerning control criterion.…”

Section: Introductionmentioning

confidence: 99%

Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames

Wan¹,

Liu²,

Jiang³

2013

Journal of Power Electronics

Self Cite

View full text Add to dashboard Cite

The modular multilevel cascade converter (MMCC) is a new family of multilevel power converters with modular realization and a cascaded pattern for submodules. The MMCC family can be classified by basic configurations and submodule types. One member of this family, the Hexverter, is configured as Double-Delta Full-Bridge (DDFB). It is a novel multilevel AC/AC converter with direct power conversion and comparatively fewer required components. It is appropriate for connecting two three-phase systems with different frequencies and driving an AC motor directly from a utility grid. This paper presents the dq model of a Hexverter with both of its AC systems by state-space representation, which then simplifies the continuous time-varying model into a periodic discrete time-invariant one. Then a generalized multivariable optimal control strategy for regulating the Hexverter's independent currents is developed. The resulting control structure can be adapted to other MMCCs and is flexible enough to include other control criterion while guaranteeing the original controller performance. The modeling method and control design are verified by simulation results.

show abstract

Integrated current control, energy control and energy balancing of Modular Multilevel Converters

Cited by 146 publications

References 6 publications

Modular Multilevel Converter Control Methods Performance Benchmark for Medium Voltage Applications

Modular Multilevel Converter Control Methods Performance Benchmark for Medium Voltage Applications

Novel Control of a Modular Multilevel Converter for Photovoltaic Applications

Multivariable Optimal Control of a Direct AC/AC Converter under Rotating dq Frames

Contact Info

Product

Resources

About