H∞ structured design of a cascaded voltage/current controller for electronically interfaced distributed energy resources

Bouzid, Allal M.; Golsorkhi, Mohammad S.; Sicard, Pierre; Chériti, A.

doi:10.1109/ever.2015.7112979

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…Then, this data must be used to define N properly according to the digital board capabilities and the maximum grid frequency. Nevertheless, the total control algorithm is easy to implement and requires relatively little computational effort, as shown in Table I and the parameters can be found by using the guidelines shown in [14], [16]- [18], among others. Enlarging the maximum grid frequency beyond allows its implementation for many applications.…”

Section: Discussionmentioning

confidence: 99%

“…A detailed analysis about the model and control parameter design is made, and therefore, the procedure may be followed for any system that needs an RC. Optimal robust controllers are presented in [14][17] [18]. The main contribution of these works is to give a clear procedure for a desired type of response by employing optimization tools to choose the best parameters.…”

Section: B Literature Reviewmentioning

confidence: 99%

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A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

et al. 2020

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Over the last few decades, the consolidated goal of reducing greenhouse gasses has increased the relevance of renewable energy research, electromobility, energy storage, and distributed generation, micro-grids, among others. Micro-grids, systems working in islanding mode, are particular cases where some disadvantages are present due to the wide variations which may appear across their electrical quantities. Variations on the voltage amplitude and the frequency are intrinsic in the operation of weak grids, because they have low inertia and therefore the load must be able to cope with these variations, otherwise loads may trip electrical system protection. Particularly, on power electronic drives, these frequency deviations will lead to increased system nonlinearities, entailing a more critical controller design. To overcome these issues, this paper presents an implementation of a resonant controller with self-tuned gains. The strategy imposes a constant sampling time which allows these controllers to be used in variable frequency environments. In addition, the computational capacity required for the digital board is also considered. The simulated and experimental results provided demonstrate the good performance of this proposal. INDEX TERMS Resonant control, variable frequency environment, micro-grids. I. INTRODUCTION A. Research gap Power Generation has gained popularity in recent years due to the need to generate electric power in alternate directions and from varying kinds of sources. [1], [2]. However, power management for these systems results in a difficult task, as some sources may be working at the maximum power point of injection regardless of the actual power consumption, for example, renewable energies. Therefore, power generation and power consumption may differ, resulting in the global system being out of balance [3]. This problem becomes critical when power systems are small micro-grids, which are usually noted as being low inertia systems. In these cases, ineffective power management leads to variations on the voltage amplitude, mainly associated to the reactive power, and frequency variations, due to active power regulation. In addition, weak grid systems will feature these issues when large loads are either connected or disconnected, making the voltage vary in amplitude and frequency, which are typical occurrences in aircraft and ship power systems [4]-[6]. Electric devices connected to these kinds of sources should be robust under these variations, thus helping to hold the system stability and avoid tripping the inbuilt protections.

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Section: Discussionmentioning

confidence: 99%

Section: B Literature Reviewmentioning

confidence: 99%

A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

et al. 2020

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“…This test verifies that the closed loop system with the

H normal∞

3DOF controller is stable even when the resistive load is increased with a load of the rectifier. Table 5 shows a comparison of THDs of PCC voltage and current using PI [44], and

H normal∞

3DOF control strategies for the four load types. As shown in Table 5, the proposed

H normal∞

3DOF control strategy has a low THD under all load conditions.…”

Section: Robustness To Loads Disturbances In Autonomous Modementioning

confidence: 99%

“…The

H normal∞

controller guarantees the stability of the system in the presence of reasonably bounded external disturbances. Thus, the impact of external disturbances on the system will be limited by

H normal∞

control theory, which emphasises the robustness [15, 43, 44]. However, in the

H normal∞

control theory, achieving strong performance goals will be subject to the ‘waterbed’ effect and some external disturbances [45], thus, it is necessary to maintain a balance between performance and stability.…”

Section: Introductionmentioning

confidence: 99%

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

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This study proposes a cascaded voltage-current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/ current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions W t , W u , W y that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.

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“…However, these ones were based on the voltage RMS value to obtain the feedback signal. Thus, their use solves the problem of voltage amplitude, but, in general, it does not solve the problem of distortion of the output voltage waveform [6]. A cascaded voltage/current control based on a virtual impedance concept has been developed in [7].…”

Section: Introductionmentioning

confidence: 99%

Robust Resonant Controllers for Distributed Energy Resources in Microgrids

et al. 2020

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Motivated by the problem of different types and variations of load in micro-grids, this paper presents robust proportional-resonant controllers with a harmonics compensator based on the internal model principle. These controllers ensure robust tracking of sinusoidal reference signals in distributed energy resource systems subject to load variation with respect to sinusoidal disturbances. The distributed generation resource and the resonant controllers are described using the augmented state system approach, allowing the application of the state feedback technique. In order to minimize the tracking error and ensure robustness against perturbation, a set of linear matrix inequalities (LMIs) are addressed for the synthesizing of controller gains. Finally, results obtained in the simulation for resonant compensators with the distributed energy system are presented, in which the controller is applied to the CC-CA inverter.

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H∞ structured design of a cascaded voltage/current controller for electronically interfaced distributed energy resources

Cited by 10 publications

References 11 publications

A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

A Simple Self-Tuning Resonant Control Approach for Power Converters Connected to Micro-Grids With Distorted Voltage Conditions

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Robust Resonant Controllers for Distributed Energy Resources in Microgrids

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