Lyapunov-Based Control Scheme for Single-Phase Grid-Connected PV Central Inverters

Meza, Carlos; Biel, Domingo; Jeltsema, Dimitri; Scherpen, Jacquelien M. A.

doi:10.1109/tcst.2011.2114348

Cited by 105 publications

(35 citation statements)

References 31 publications

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“…However, network variables would not always remain in small neighborhood of the desired operating point. In these cases, nonlinear model [91,92] or large-scale system model [93] provide a suitable model of the microgrid. 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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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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“…For the secure and reliable integrations of such solar-PV systems with the grid, different standards are in practice in various countries such as in [2]. To control the operation under these guidelines, solutions have also been reported in the literature using a single-stage inverter [3-4] and two-stage inverter [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Lyapunov Function and Sliding Mode Control Approach for the Solar-PV Grid Interface System

Rezkallah

Sharma²,

Chandra

et al. 2017

IEEE Trans. Ind. Electron.

103

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Abstract-This paper deals with control of a solar photovoltaic (PV) power generating system interfaced with the grid. A sliding mode control approach (SMC) is used for achieving maximum power tracking (MPT) control of solar-PV array. The Lyapunov function-based control approach is designed and modeled for the DC-AC inverter to serve the functions of an active power injection to the grid, balanced grid currents at unity power factor and load currents harmonics compensation. Proposed approaches eliminate the need of adjustment of system parameters under changing loads and generation scenario. The effectiveness of proposed control strategies is established using its stability analyses. The performance of solar-PV power generating system with proposed control algorithms is demonstrated using simulation and experimental studies under various operating conditions. Index Terms-Lyapunov-based function, MPT, PV array, power quality improvement sliding mode control approach, stability analysis. I. INTRODUCTIONENEWABLE energy programs are receiving reasonable attention worldwide to cater the needs of electricity. According to U.S. Energy Information Administration (EIA) reports, the growth rate of such programs is 2.5% per/year [1]. In fact, there is tremendous potential available to produce electricity using the solar energy. The recent trends are indicating increase in capital investments of solar based power projects. Solar photovoltaic (PV) panel generates DC power and hence additional components, such as power converters are instrumental to tie it with the AC grid. Further, solar based power generation is intermittent in nature which varies very rapidly changes in solar irradiation. Therefore, solar based power penetration into grid adversely affects the stability of the network and quality of supply. For the secure and reliable integrations of such solar-PV systems with the grid, different standards are in practice in various countries such as in [2]. To control the operation under these guidelines, solutions have also been reported in the literature using a single-stage inverter [3-4] and two-stage inverter [5][6][7][8].To know which topology is preferred for a typical application, a comparative study has been made in [9]. The single stage topology is considered more efficient due to less number of components. However, two-stage power conversion provides more flexibility in design, operation and control. The DC-DC converter is employed in between solar-PV array and DC link of an inverter and controlled to achieve maximum power tracking (MPT) from a solar PV array.Various control approaches have been reported in the literature to improve the efficiency of solar PV array [10]. Each MPT method has its own advantages and disadvantages. Compared to the existing MPT methods, perturbation and observation is widely used in industry due to its simplicity, but it suffers during rapid solar irradiation change [10][11]. In addition, at steady state, the operating point oscillates around the maximum power point (MPP), which lead...

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“…AC/DC power converters are widely used in power systems and can operate as a rectifier or an inverter in order to integrate loads or power sources to the electric grid [1], [2]. In most of the single-phase or the three-phase converter applications, the main control tasks are the accurate dc bus voltage regulation and power factor correction (PFC).…”

Section: Introductionmentioning

confidence: 99%

Current-limiting non-linear controller for single-phase AC/DC PWM power converters

Konstantopoulos

Zhong

2015

2015 American Control Conference (ACC)

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In this work, a non-linear controller with an inherent current-limiting property is proposed to achieve dc output voltage regulation and unity power factor operation for single-phase ac/dc converters. The proposed current-limiting non-linear controller (CLNC) acts independently from the system parameters and is proven to guarantee closed-loop system stability using non-linear control theory. Without requiring the instantaneous measurement of the grid voltage, a PLL or external limiters, the CLNC additionally guarantees that the input current will always remain below a given maximum value, even during transients. This represents a significant superiority with respect to the existing techniques, since a given limit for the input current is achieved without changing the controller dynamics or using external protection circuits. Extended simulation results using both Matlab/Simulink and a real-time digital simulator are presented to verify the proposed controller performance under several changes of the reference voltage.

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Lyapunov-Based Control Scheme for Single-Phase Grid-Connected PV Central Inverters

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Cited by 105 publications

References 31 publications

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

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

Lyapunov Function and Sliding Mode Control Approach for the Solar-PV Grid Interface System

Current-limiting non-linear controller for single-phase AC/DC PWM power converters

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