Special Issue "Control Strategies for Power Conversion Systems"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Energy Fundamentals and Conversion".

Deadline for manuscript submissions: 15 March 2020.

Special Issue Editors

Prof. Roberto Cárdenas Dobson
E-Mail Website
Guest Editor
Electrical Engineering Department, University of Chile, Chile
Interests: electrical machines; variable speed drives; renewable energy systems
Prof. Matías Díaz
E-Mail Website
Guest Editor
Electrical Engineering Department, University of Santiago, Chile
Interests: wind energy conversion systems; multilevel converters; drives

Special Issue Information

Dear colleagues,

The increasing penetration of renewable energy sources (RES) in the utility and introduction of new generation topologies as microgrids and distributed generation systems have increased the penetration of power converters in modern power systems. At present, power converters (PC) are used in a wide range of applications, such as electric vehicles, microgrids, renewable energy conversion systems, variable speed drives, power conditioners, high voltage direct current (HVDC) transmission, energy storage systems, traction systems, etc.

The high penetration of generation units based on power converters reduces the total rotational inertia available in a system, and this negatively impacts its stiffness and power system stability. Therefore, new control systems have to be developed to improve the performance of power converter based generation units, and it is now expected that they provide ancillary services, such as frequency and voltage support, harmonic compensation, as well as synthetic inertia emulation. New droop control methods have to be applied to PC-based generation units to achieve active and reactive power sharing, distributed averaging proportional integral controllers or centralized systems used to provide frequency regulation, in microgrids, etc.

Despite these several requirements, most PCs use control systems that rely on cascaded linear control. However, cascaded linear control could lead to performance limitations, inflexibility, and limited bandwidth.

Therefore, it is essential to develop advanced control strategies for power conversion systems so that the robustness, flexibility, and dynamic performance of modern power systems can be significantly improved.

Editors invite original manuscripts presenting recent advances in these fields with particular reference but not limited to:

  • Novel modeling approaches and control strategies for PC based RES
  • Novel modeling approaches and control strategies for microgrids and distributed generation systems
  • Robust, predictive, nonlinear, passivity-based control of PC and RES
  • Modeling and control of power systems with high penetration of RES
  • Ancillary services for PC-based RES
  • New control systems and topologies for large power RES applications
  • Grid integration of large power RES
  • New control systems for wind energy and PV conversion systems

Prof. Roberto Cárdenas Dobson
Prof. Matías Díaz
Guest Editors

Manuscript Submission Information

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Keywords

  • renewable energy sources
  • advanced control strategies
  • power converters
  • robust control
  • frequency control
  • inertia emulation
  • microgrids

Published Papers (4 papers)

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Research

Open AccessArticle
Control of a Modular Multilevel Matrix Converter for Unified Power Flow Controller Applications
Energies 2020, 13(4), 953; https://doi.org/10.3390/en13040953 - 20 Feb 2020
Abstract
The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of [...] Read more.
The modular multilevel matrix converter has been proposed as a suitable option for high power applications such as flexible AC transmission systems. Among flexible AC transmission systems, the unified power flow controller stands out as the most versatile device. However, the application of the modular multilevel matrix converter has not been thoroughly analyzed for unified power flow controller applications due to the sophisticated control systems that are needed when its ports operate at equal frequencies. In this context, this paper presents a cascaded control structure for a modular multilevel matrix converter based unified power flow controller. The control is implemented in a decoupled reference frame, and it features proportional-integral external controllers and internal proportional multi-resonant controllers. Additionally, the input port of the modular multilevel matrix converter is regulated in grid-feeding mode, and the output port is regulated in grid-forming mode to provide power flow compensation. The effectiveness of the proposed vector control system is demonstrated through simulation studies and experimental validation tests conducted with a 27-cell 5 kW prototype. Full article
(This article belongs to the Special Issue Control Strategies for Power Conversion Systems)
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Open AccessArticle
Control for Three-Phase LCL-Filter PWM Rectifier with BESS-Oriented Application
Energies 2019, 12(21), 4093; https://doi.org/10.3390/en12214093 - 26 Oct 2019
Abstract
This paper deals with a battery energy storage system (BESS) in only one of its multiple operating modes, that is when the BESS is charging the battery bank and with the focus on the control scheme design for the BESS input stage, which [...] Read more.
This paper deals with a battery energy storage system (BESS) in only one of its multiple operating modes, that is when the BESS is charging the battery bank and with the focus on the control scheme design for the BESS input stage, which is a three-phase LCL-filter PWM rectifier. The rectifier’s main requirements comprise output voltage regulation, power factor control, and low input current harmonic distortion, even in the presence of input voltage variations. Typically, these objectives are modeled by using a dq model with its corresponding two-loop controller architecture, including an outer voltage loop and a current internal loop. This paper outlines an alternative approach to tackle the problem by using not only an input–output map linearization controller, with the aim of a single-loop current control, but also by avoiding the dq modeling. In this case, the voltage is indirectly controlled by computing the current references based on the converter power balance. The mathematical model of the three-phase LCL-filter PWM rectifier is defined based on the delta connection of the filter, which accomplishes the requirements of a 100 kW BESS module. Extensive simulation results are included to confirm the performance of the proposed closed-loop control in practical applications. Full article
(This article belongs to the Special Issue Control Strategies for Power Conversion Systems)
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Open AccessArticle
A Control Strategy for Smooth Power Tracking of a Grid-Connected Virtual Synchronous Generator Based on Linear Active Disturbance Rejection Control
Energies 2019, 12(15), 3024; https://doi.org/10.3390/en12153024 - 06 Aug 2019
Cited by 1
Abstract
The power quality of new energy resources has received tremendous attention recently. The control approach for the inverter, an interface between the new energy resources, and the infinite bus system is of vital importance. For the virtual synchronous generator (VSG), one of the [...] Read more.
The power quality of new energy resources has received tremendous attention recently. The control approach for the inverter, an interface between the new energy resources, and the infinite bus system is of vital importance. For the virtual synchronous generator (VSG), one of the research hotspots in the inverter control field, there are some challenges remaining to be dealt with. First is the contradiction between the rapid response and overshoot of active power output if VSG is connected to the grid. Secondly, the active power is deeply influenced by the fluctuation of gird frequency and this may bring power oscillation to VSG in weak grids. In this article, an active power controller for power tracking of grid-connected VSG is designed based on linear active disturbance rejection control (LADRC) by compensating for the lumped disturbance in a feedforward fashion. The parameters of the controller are analyzed and tuned in the frequency domain to acquire a desirable control performance. Moreover, the robustness of the control system is also considered. Simulation results show that the designed control system can transmit active power to the grid in a timely manner with no overshoot, as demanded. Additionally, it can output active power steadily according to the power reference without using a phase-locked loop (PLL) when the grid frequency has different features of fluctuation. In addition, the simulation results demonstrate that the improved VSG has strong robustness to the model parameter perturbation and mismatch. Full article
(This article belongs to the Special Issue Control Strategies for Power Conversion Systems)
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Open AccessArticle
Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter
Energies 2019, 12(12), 2235; https://doi.org/10.3390/en12122235 - 12 Jun 2019
Abstract
Nowadays, wind turbines based on a doubly fed induction generator (DFIG) are a commonly used solution in the wind industry. The standard converter topology used in these systems is the voltage source inverter (VSI). The use of reverse-blocking insulated gate bipolar transistor (RB-IGBT) [...] Read more.
Nowadays, wind turbines based on a doubly fed induction generator (DFIG) are a commonly used solution in the wind industry. The standard converter topology used in these systems is the voltage source inverter (VSI). The use of reverse-blocking insulated gate bipolar transistor (RB-IGBT) in the current source inverter topology (CSI), which is an alternative topology, opens new possibilities of control methods. This paper presents a novel power control system for a DFIG supplied by a CSI. The authors propose to use multi-scalar DFIG state variables. A nonlinear control method realized by feedback linearization was used to control the active and reactive powers of the generator. In the feedback linearization controls, the nonlinear DFIG model was taken into account. In the control system structure, classical proportional–integral controllers were used. The control variables were the output current vector components of the CSI. Such approach was named the “current control”. The proposed control method is characterized by good dynamic properties which, combined with the inverter properties in the rotor circuit, allow to increase the quality of the energy transferred to the grid by the generator. In the simulation tests, the correctness of the decoupling of the active and reactive power control loops, the dynamics of controlled power changes, and the change of the machine operating range resulting from the increase of the rotational speed of the generator shaft were controlled. The simulation studies also evaluated the impact of changes in the value of the passive elements of the system on the operation of the generator system. Characteristic operating states of the generator system were analyzed using computer simulations. Full article
(This article belongs to the Special Issue Control Strategies for Power Conversion Systems)
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