Modeling Issues in Three-Phase Current Source Rectifiers that use Damping Resistors

Melín, Pedro; Zargari, Navid R.; Sanchez, Miguel; Guzmán, Johan

doi:10.1109/isie.2006.295816

Cited by 13 publications

(3 citation statements)

References 6 publications

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“…When passing through the modulation block in the inverter, the CSI signals m ′ a , m ′ b , and m ′ c undergo a gain G ac . The effect of the inverter bridge topology on modulation, whether operating as an inverter or rectifier, introduces a 30-degree phase shift in these signals compared to the original ones from the controller [43]. Therefore, these signals can be represented as:…”

Section: Dynamic Behavior Modelingmentioning

confidence: 99%

Developing and Evaluating the Operating Region of a Grid-Connected Current Source Inverter from Its Mathematical Model

Baier,

Melin,

Torres

et al. 2024

Mathematics

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Grid-connected power inverters are indispensable in modern electrical systems, playing a pivotal role in enhancing the integration of renewable energies into power grids. Their significance, primarily when functioning as grid-forming inverters, extends to maintaining the grid’s inertia and strength—a distinct advancement over traditional grid-following operations. As grid-forming inverters, these devices emulate the characteristics of synchronous generators and can act as robust voltage sources, providing essential ancillary services. This behavior is particularly relevant when integrating energy storage systems on the converters’ direct current side. Among the various inverter topologies, the current source inverter (CSI) has emerged as a promising yet underexplored alternative for grid-forming applications. CSIs, when paired with their AC output filters, can effectively operate as voltage sources, utilizing control strategies that facilitate the integration of renewable energies into the electrical system. Their design inherently manages output current fluctuations, reducing the need for restrictive current limitations or additional protective measures. This paper examines the operational region of CSIs, obtained through detailed modeling, to explore their advantages, challenges, and potential for enhancing grid-connected systems. Analyzing the operating region from the converter model verifies the limits of where the converter can operate in a plane of active and reactive powers. For a small prototype model operating with 7 amperes in DC and 120 V in AC, it is possible to supply or absorb active power exceeding 1000 W and manage maximum reactive power values around 500 VAr, as determined by its operating region. Simulations also confirm that small changes in the control reference, as little as 5%, towards the region’s right limits cause significant oscillations in the dynamic control responses. This research aims to deepen our understanding of CSIs’ operational capabilities and highlight their unique benefits in advancing grid-connected systems and promoting the integration of renewable energy using this technology.

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Section: Dynamic Behavior Modelingmentioning

confidence: 99%

Developing and Evaluating the Operating Region of a Grid-Connected Current Source Inverter from Its Mathematical Model

Baier,

Melin,

Torres

et al. 2024

Mathematics

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“…Considering v shunt abc and i t abc , one can write a generalized model based on the average model of the CSC [8] as…”

Section: A Generalized Model For Csc-upqcs Topologiesmentioning

confidence: 99%

“…The strategy for the harmonic mitigation is based on the control scheme shown in [5], [6], [8] (Fig. 2)where an additional stage for harmonic compensation has been added (Fig.…”

Section: Proposed Controlmentioning

confidence: 99%

Unified Power Quality Conditioner based on current source converters for harmonic mitigation using a decoupled control strategy

Melín

Baier

Guzmán

et al. 2011

IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society

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The Unified Power Quality Conditioner (UPQC) is used to improve the power quality and is based on the union of a series active filter and a shunt active filter. The resulting topology has the characteristics of both filters and can compensate voltage and currents disturbances and improve the customer's power quality. The topology based on current source converters (CSC-UPQC) has a good dynamic behavior to mitigate voltage disturbances as it uses a first order filter in the series stage. This allows a rapid response while using low switching frequencies without the problems associated with the resonance of the second order filter as required in the voltage source topology. This work develops a control scheme based on a non-linear control scheme for load current harmonic compensation by the shunt stage. The proposed control scheme regulates the load voltage under fast PCC voltage disturbances meanwhile the load currents harmonics are mitigated.

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Control of Multilevel STATCOMs

Muñoz

Melín

2014

Static Compensators (STATCOMs) in Power Systems

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Control strategies suitable for multilevel STATCOMs are reviewed in this chapter. First of all, the models are systematically deducted and especial emphasis is given to the dynamic and steady state analysis in order to facilitate the study of the control techniques. Then, these control schemes aimed to achieve the overall compensation objectives are classified in linear and nonlinear approaches. In fact, among the linear alternatives, the Proportional-Resonant (PR) and the Proportional-Integral (PI) controllers are presented as feasible ways to achieve zero steady state error in the stationary and the Synchronous Reference Frame (SRF), respectively. For nonlinear strategies, the input/output linearization control technique is applied. Hysteresis and predictive controllers are also discussed as alternatives to control the STATCOM in the stationary abc or α-β frame. The main features of all the aforementioned control techniques will be presented and because the balanced operation of the modules is not natural, dedicated control strategies in charge of balancing the DC side variables, DC voltages for Voltage Source Converters (VSC) and DC currents for Current Source Converters (CSC) based topologies, are shown as an important part of the control of the multilevel STATCOM. Indeed, the inclusion of these dedicated controllers to balance the operation of the different modules is mandatory for multilevel compensators if high performance overall waveforms are required. In order to illustrate the controllers performance operation, key current and voltage waveforms are shown for linear load compensation, using Cascade H-Bridge (CHB), Neutral Point Clamped (NPC) and Multilevel Current Source Converter (MCSC) based STATCOMs.

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Modeling Issues in Three-Phase Current Source Rectifiers that use Damping Resistors

Cited by 13 publications

References 6 publications

Developing and Evaluating the Operating Region of a Grid-Connected Current Source Inverter from Its Mathematical Model

Developing and Evaluating the Operating Region of a Grid-Connected Current Source Inverter from Its Mathematical Model

Unified Power Quality Conditioner based on current source converters for harmonic mitigation using a decoupled control strategy

Control of Multilevel STATCOMs

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