Reduced-Order Small-Signal Model of Microgrid Systems

Rasheduzzaman, Md.; Mueller, Jacob; Kimball, Jonathan W.

doi:10.1109/tste.2015.2433177

Cited by 184 publications

(108 citation statements)

References 47 publications

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“…Moreover, increasing the model complexity does not provide significant information about the dominant dynamic behavior of the converter [27][28][29]. Consequently, the model proposed in this paper is obtained based on the next simplifying assumptions: 1) switches are considered "ideal", i.e.…”

Section: Figure 1 Bridgless Pfc Boost Converter Topologymentioning

confidence: 99%

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Modeling and development of a bridgeless PFC Boost rectifier

Mejía-Ruiz

Muñóz-Galeano

López-Lezama

2017

Rev. Fac. Ing. Univ. Antioquia

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ABSTRACT:This paper proposes a model of the bridgeless PFC (Power Factor Correction) boost rectifier for control purposes based on an averaged small-signal analysis. From circuital laws, four operation modes are defined and explained, ensuring a relationship of physical variables in the converter. Based on the proposed model, two-loop cascade control structures composed of Proportional-Integral (PI) lineal controllers are proposed. Design consideration for dimensioning reactive elements is included, providing minimum values for their inductance and capacitance. Implementation of a laboratory prototype of 900 W and experimental results are presented to validate and reaffirm the proposed model. Experimental results demonstrate that the use of the bridgeless PFC boost converter model allows the Power Factor (PF) to be elevated up to 0.99, to reduce the THD i (Total Harmonic Distortion of the Current) to 3.9% and to control the DC voltage level on output. Compliance of standards of power quality EN 61000-3-2 (IEC 1000-3-2) are experimentally verified.

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Section: Figure 1 Bridgless Pfc Boost Converter Topologymentioning

confidence: 99%

“…This transfer function is defined based on: Eq. (27), data values shown in Tables 1 and 2, and the defined operating point, see Eq. (35).…”

Section: Design Of Current Control Systemmentioning

confidence: 99%

Modeling and development of a bridgeless PFC Boost rectifier

Mejía-Ruiz

Muñóz-Galeano

López-Lezama

2017

Rev. Fac. Ing. Univ. Antioquia

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“…Although, a comprehensive model of a microgrid provides accurate dynamic characteristics of the grid, it is very complex and increases the computational burden of the designed controller and power management strategy. Therefore, reduced-order model of microgrids is used [89][90] to address the associated issues of complex comprehensive model. It is shown in Ref.…”

Section: Microgrid Modeling and Dynamic Characteristicsmentioning

confidence: 99%

“…Therefore, reduced-order model of microgrids is used [89][90] to address the associated issues of complex comprehensive model. It is shown in Ref.…”

Section: Microgrid Modeling and Dynamic Characteristicsmentioning

confidence: 99%

Overview of Technical Challenges, Available Technologies and Ongoing Developments of AC/DC Microgrids

Sabzehgar¹

2017

Development and Integration of Microgrids

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Gradual depletion of fossil fuel resources, poor energy eiciency of conventional power plants, and environmental pollution have led to a new grid architecture known as smart microgrid. The smart microgrid concept provides a promising solution that enables high penetration of distributed generation from renewable energy sources without requiring to redesign the distribution system, which results in stable operation during faults and disturbances. However, distributed generators/loads and interaction between all nodes within a microgrid will substantially increase the complexity of the power system operation, control, and communications. Many innovative techniques and technologies have been proposed to address the complexity and challenges of microgrids including power quality, power low balancing, real-time power management, voltage and frequency control, load sharing during islanding, protection, stability, reliability, eiciency, and economical operation. All key issues of the microgrids, diferent solutions, and available methods and technologies to address such issues are reviewed in this chapter. Pros and cons of each method are discussed. Furthermore, an extensive comprehensive review for researchers and scholars working on microgrid applications is provided in this chapter to help them identify the areas that need improvements and innovative solutions for increasing the eiciency of modern power distribution grid.Keywords: AC microgrid, DC microgrid, microgrid power quality, power management, microgrid modeling, power electronics, renewable energies © 2017 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. IntroductionThe smart microgrid concept was irst developed in Refs. [1,2]. The capability of integration of a large number of distributed power generation sources and high penetration of renewable sources such as photovoltaic panels, wind turbines, and fuel cells within a smart microgrid made it very atractive. In fact, management of multiple distributed power generation sources including renewable energy sources in a smart microgrid ofers many advantages such as signiicant reduction in the need for a transmission and high voltage distribution system, satisfying the growing demand of electricity, and improving energy utilization eiciency and reliability. However, interaction between all nodes within a microgrid including both conventional and renewable energy generation sources will not only increase the complexity of the power system considerably, but it will also raise challenging issues of reliability and power quality due to intermitent nature of renewable sources. Therefore, many technical challenges must yet be overcome to ensure safe, secure, reliable, optimized, eicient, and cost efective operation of the microgrid.Academic scholars and industry experts ofe...

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“…After a number of distributed power supplies are connected to the existing distribution networks, electric energy quality problems may be caused, such as deviations of the grid voltage and frequency, voltage fluctuation and so on, all of which seriously endanger the safe and reliable operation of the grid. In order to coordinate the conflicts between a large grid and distributed generation and to sufficiently explore the efficiencies of distributed power supplies, CERTS brought forward the concept of a microgrid in the beginning of this century [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Research on the Power Sharing Control and Stability of VSGs

Xie¹,

Zang²,

Peng³

et al. 2017

Journal of Power Electronics

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Aiming at the deficiencies of power sharing control performances when a traditional droop control is adopted for microgrid inverters, this paper proposes a microgrid inverter power sharing control strategy based on a virtual synchronous generator. This control method simulates the electromechanical transient characteristics of a synchronous generator in a power system by an ontology algorithm and the control laws of a synchronous generator by control over the speed governor and excitation regulator. As a result, that the microgrid system is able to effectively retain the stability of the voltage and frequency, and the power sharing precision of the microgrid inverter is improved. Based on an analysis of stability of a microgrid system controlled by a virtual synchronous generator, design thoughts are provided for further improvement of the power sharing precision of inverters. The simulation results shows that when the virtual synchronous generator based control strategy was adopted, the power sharing performances of microgrid inverters are improved more obviously than those using the droop control strategy.

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Reduced-Order Small-Signal Model of Microgrid Systems

Cited by 184 publications

References 47 publications

Modeling and development of a bridgeless PFC Boost rectifier

Modeling and development of a bridgeless PFC Boost rectifier

Overview of Technical Challenges, Available Technologies and Ongoing Developments of AC/DC Microgrids

Research on the Power Sharing Control and Stability of VSGs

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