Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain

Liu, Ziquan; Yao, Wei; Wen, Jinyu

doi:10.3390/en10040449

Cited by 15 publications

(13 citation statements)

References 27 publications

(16 reference statements)

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“…Therefore, the RoA is evaluated by the symmetric of (38), whereas the last term is cancelled. As determined by (30), condition M x * x = 0 actually provides the maximum δ max and results in the solution of the equation: cos δ max − cos δ * −(δ * −δ max ) sin δ max = 0 (39) Therefore, for any bounded P m which approaches a constant value P m > 0 as t → ∞ , a particular equilibrium is obtained from (36) in the range 0 < δ * < π/2 and another one at π − δ * . As clarified in the next paragraphs, for the first equilibrium, a unique value of the δ max is calculated by solving (39).…”

Section: Stability Analysis Of the Single Generator Infinite Bus (Sgimentioning

confidence: 99%

“…Thus, for example, a varying electromotive force can be considered by inserting its It is pointed out that the aforementioned procedure and the integration of the system model of (44)-(46) or (44), (45), and (50) on the basis of the simpler model of (32) and (33) indicate how one can suitably build up more complex power system models in the frame of the proposed theoretical infrastructure. Thus, for example, a varying electromotive force can be considered by inserting its dynamical loop, or even more complex systems can be examined by taking into account interconnected multi-machine schemes [32,36]. Also systems, with power electronic conversion, such as high-voltage direct current (HVDC) transmission systems [37], or with advanced observer based designs [38], can be easily analyzed.…”

Section: Inserting Negative ∆ω-Feedback Control Lawmentioning

confidence: 99%

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Studying State Convergence of Input-to-State Stable Systems with Applications to Power System Analysis

Alexandridis

2019

Energies

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In stability studies, the response of a system enforced by external, known or unknown, inputs is of great importance. Although such an analysis is quite easy for linear systems, it becomes a cumbersome task when nonlinearities exist in the system model. Nevertheless, most of the real-world systems are externally enforced nonlinear systems with nonzero equilibriums. Representative examples in this category include power systems, where studies on stability and convergence to equilibrium constitute crucial objectives. Driven by this need, the aim of the present work is twofold: First, to substantially complete the theoretical infrastructure by establishing globally valid sufficient conditions for externally enforced nonlinear systems that converge to nonzero equilibriums and, second, to deploy an efficient method easily applicable on practical problems as it is analyzed in detail on a typical power system example. To that end, in the theoretical first part of the paper, a rigorous nonlinear analysis is developed. Particularly, starting from the well-established nonlinear systems theory based on Lyapunov techniques and on the input-to-state stability (ISS) notion, it is proven after a systematic and lengthy analysis that ISS can also guarantee convergence to nonzero equilibrium. Two theorems and two corollaries are established to provide the sufficient conditions. As shown in the paper, the main stability and convergence objectives for externally enforced systems are fulfilled if simple exponential or asymptotic converging conditions can be proven for the unforced system. Then, global or local convergence is established, respectively, while for the latter case, a novel method based on a distance-like measure for determining the region of attraction (RoA) is proposed. The theoretical results are examined on classic power system generation nonlinear models. The power system examples are suitably selected in order to effectively demonstrate the proposed method as a stability analysis tool and to validate all the particular steps, especially that of evaluating the RoA. The examined system results clearly verify the theoretical part, indicating a rather wide range of applications in power systems.

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Section: Stability Analysis Of the Single Generator Infinite Bus (Sgimentioning

confidence: 99%

Section: Inserting Negative ∆ω-Feedback Control Lawmentioning

confidence: 99%

Studying State Convergence of Input-to-State Stable Systems with Applications to Power System Analysis

Alexandridis

2019

Energies

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“…These are basically associated with many other critical social elements such as food production, water consumption, manufacturing, resource management, security, and environment. Currently, process system engineering is in a position where it can solve the most important problems associated with energy systems and mitigate their impact on all countries around the world [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Test Bed of a Low-Power Digital Excitation System for Industry 4.0

Lee

2018

Processes

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Since modeling and simulation are the two most effective tools that can be used in the design or analysis process, they play a vital role in developing such system. In many cases, they are the only possible means of making a safe engineering decision for a new concept of process for a large-scale system. Elsewhere, they are used as a critical element in the analysis of energy systems or to suggest a method of developing a novel and effective energy system model. Thus, in this study, simulations and test bed experiment were carried out to assess a low-power digital excitation system in order to validate its effectiveness. The excitation systems currently used by most of the power stations in the Republic of Korea were installed during the 1970s or 1980s. Unfortunately, it is difficult to seek technical assistance for them as they depend on foreign technologies, requiring a large sum to be paid when requesting one or more engineers to be dispatched. As such, technical updates have always been made by foreign companies, since it is not easy to make modifications to the system without the help of the original system developer. The technology developed in this study was designed to address such problem. The inability to conduct a test for an actual system can be solved by using a power system analysis program to analyze the characteristics of the controller. The study confirmed the system’s effectiveness, and the Test Bed was proven to be flexible and adequate for the experiment. The proposed excitation system is expected to increase the stability and economic effect of the system by optimizing existing systems. In the future, the authors plan to focus on student education by establishing an education system that allows students to learn about the digital excitation system and its simulation.

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“…The energy sources that could replace nuclear power are largely divided into the existing limited energies and renewable energies [1][2][3]. However, that the supply of the former is not stable due to their unequal geographic distributions that put countries such as the ROK which have few fossil energy sources in a weak position in the energy market [4][5][6]. Alternative energy sources include renewable energies generated by the limitless supply of sunlight, wind, etc.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Algorithm and Test Bed for Improvement of Efficiency of ESS and Energy Use

2018

Electronics

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The Republic of Korea (ROK) has four distinct seasons. Such an environment provides many benefits, but also brings some major problems when using new and renewable energies. The rainy season or typhoons in summer become the main causes of inconsistent production rates of these energies, and this would become a fatal weakness in supplying stable power to the industries running continuously, such as the aquaculture industry. This study proposed an improvement plan for the efficiency of Energy Storage System (ESS) and energy use. Use of sodium-ion batteries is suggested to overcome the disadvantages of lithium-ion batteries, which are dominant in the current market; a greedy algorithm and the Floyd–Warshall algorithm were also proposed as a method of scheduling energy use considering the elements that could affect communication output and energy use. Some significant correlations between communication output and energy efficiency have been identified through the OPNET-based simulations. The simulation results showed that the greedy algorithm was more efficient. This algorithm was then implemented with C-language to apply it to the Test Bed developed in the previous study. The results of the Test Bed experiment supported the proposals.

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Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain

Cited by 15 publications

References 27 publications

Studying State Convergence of Input-to-State Stable Systems with Applications to Power System Analysis

Studying State Convergence of Input-to-State Stable Systems with Applications to Power System Analysis

Simulation and Test Bed of a Low-Power Digital Excitation System for Industry 4.0

An Optimized Algorithm and Test Bed for Improvement of Efficiency of ESS and Energy Use

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