A Model-Based Controller for the Cascade H-Bridge Multilevel Converter Used as a Shunt Active Filter

Voltage source inverters (VSI) connected to the grid by means of LCL filters offer benefits in the injection of active power into the grid, since they provide low harmonic distortion and a small size of the output filter. However LCL grid connected VSI must be designed in order to provide damping at the filter resonance frequency. This paper presents the design and analysis of a model based controller for an LCL coupling filter to inject active power into the grid for single phase photovoltaic transformerless applications. The control objectives are to provide closed-loop stability and to assure that the current to be injected follows a reference which is proportional to the grid voltage. Therefore, these objectives guarantee the active power injection to the grid. The proposed output feedback controller is based on the error model of the LCL filter and makes use only of the measurements of the output current of the inverter and the grid voltage.

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“…Hence, the following linear estimator is used [21], [22] to reconstruct the fundamental component of the voltagev S and its time derivative ωφ.v…”

Section: A Estimation Of the Fundamental Component Of The Grid Voltamentioning

confidence: 99%

Model based controller for an LCL coupling filter for transformerless grid connected inverters in PV applications

Sosa

Martinez‐Rodriguez

Vázquez

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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“…Optimal actuation to minimize the cost function is applied in the next sampling period [12], [13]. However, a main drawback of the FS-PCC is its large computational burden [15]. For the application of CHB inverters which have a large number of switching states and redundancies, the computational burden increases…”

Section: Introductionmentioning

confidence: 99%

“…This in turn, requires a reduced sampling frequency compared with other control methods [15]- [18]. In CHB inverters, reductions of the control complexity and computational burden have become important issues for the successful implementation of the FS-PCC method.…”

Section: Introductionmentioning

confidence: 99%

Predictive Current Control for Multilevel Cascaded H-Bridge Inverters Based on a Deadbeat Solution

Chen¹,

Tu²,

Wang³

et al. 2017

Journal of Power Electronics

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Finite-set predictive current control (FS-PCC) is advantageous for power converters due to its high dynamic performance and has received increasing interest in multilevel inverters. Among multilevel inverter topologies, the cascaded H-bridge (CHB) inverter is popular and mature in the industry. However, a main drawback of FS-PCC is its large computational burden, especially for the application of CHB inverters. In this paper, an FS-PCC method based on a deadbeat solution for three-phase zero-common-mode-voltage CHB inverters is proposed. In the proposed method, an inverse model of the load is utilized to calculate the reference voltage based on the reference current. In addition, a cost function is directly expressed in the terms of the voltage errors. An optimal control actuation is selected by minimizing the cost function. In the proposed method, only three instead of all of the control actuations are used for the calculations in one sampling period. This leads to a significant reduction in computations. The proposed method is tested on a three-phase 5-level CHB inverter. Simulation and experimental results show a very similar and comparable control performance from the proposed method compared with the traditional FS-PCC method which evaluates the cost function for all of the control actuations.

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“…Active power filters have been analyzed, designed and implemented with the aim of compensating the power factor by using different topologies, for instance, full-bridge, multilevel H-bridge [4], and Neutral Point Clamped (NPC) topologies [5].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is of principal interest for the NPC to reach and maintain a desired constant voltage level in the DC-link, and to maintain a balanced voltage between the two capacitors on the DC-link. This twofold control problem has been addressed in [4], [7], [15] for other converter topologies.…”

Section: Introductionmentioning

confidence: 99%

A model-based controller for a half-bridge NPC used as an active power filter

Martinez‐Rodriguez

Sosa

Vázquez

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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This paper presents a model-based controller for an active power filter (APF) to compensate reactive power and current harmonic distortion in a single-phase system. A Halfbridge Neutral Point Clamped (NPC) topology is selected as a voltage source inverter (VSI) to implement the APF. The control scheme is composed by three control loops referred as the inner control loop (or current loop), the regulation loop, and the balance control loop. The inner control loop is aimed to compensate both the displacement power factor (DPF) and the harmonic distortion of the current flowing to the grid. Only compensation of odd harmonics is considered which is the distortion present in most single-phase non-linear loads. The regulation and balance loops are designed to achieve the regulation and balance of the capacitor voltages in the DC-link. Numerical results are presented to show the performance of the proposed solution.

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A Model-Based Controller for the Cascade H-Bridge Multilevel Converter Used as a Shunt Active Filter

Cited by 85 publications

References 25 publications

Model based controller for an LCL coupling filter for transformerless grid connected inverters in PV applications

Model based controller for an LCL coupling filter for transformerless grid connected inverters in PV applications

Predictive Current Control for Multilevel Cascaded H-Bridge Inverters Based on a Deadbeat Solution

A model-based controller for a half-bridge NPC used as an active power filter

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