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Special Issue "Recent Advances and Challenges in Emerging Power Systems"

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A special issue of Inventions (ISSN 2411-5134). This special issue belongs to the section "Inventions and Innovation in Electrical Engineering/Energy/Communications".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 4409

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Prof. Dr. Om P. Malik

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Department of Electrical & Computer Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
Interests: digital protection; adaptive control; control of renewable power generation and microgrids; AI applications in power system control
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Special Issue Information

Dear Colleagues,

The continually increasing demand for energy, and the pollution caused by increased generation of electricity using fossil fuels, has caused environmental concerns. This has led to the development of renewable energy sources for the generation of electricity and their integration within the existing conventional power networks. Differences in the characteristics of the generation of electricity from conventional and renewable energy sources offer challenges, and major restructuring in the operation, control, and protection practices of the entire power network is taking place at present to integrate the two in a seamless and efficient manner. It also offers a tremendous opportunity to rejuvenate the practices that have developed over the past 140 years and enhance the entire grid operation, making it more efficient and reliable in the light of the newly developed technologies. A large number of investigators in all parts of the world are now working in developing new ideas and schemes from this perspective, and many advances in the emerging power systems are being made. The objective of this Special Issue of ‘Inventions’ is to provide a platform for all researchers working in any aspect of the integration of the conventional power systems and renewable energy sources for generation of electricity to contribute their recent ideas.

Prof. Dr. Om P. Malik
Guest Editor

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Keywords

renewable energy sources
conventional power networks
integration of conventional and renewable generation
operation, control and protection of power systems

Published Papers (5 papers)

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Research

Open AccessArticle

Robust Control and Active Vibration Suppression in Dynamics of Smart Systems

Amalia Moutsopoulou

Georgios E. Stavroulakis

Anastasios Pouliezos

Markos Petousis

and

Nectarios Vidakis

Inventions 2023, 8(1), 47; https://doi.org/10.3390/inventions8010047 - 09 Feb 2023

Viewed by 586

Abstract

Challenging issues arise in the design of control strategies for piezoelectric smart structures. Piezoelectric materials have been investigated for use in distributed parameter systems in order to provide active control efficiently and affordably. In the active control of dynamic systems, distributed sensors and actuators can be created using piezoelectric materials. The three fundamental issues that structural control engineers must face when creating robust control laws are structural modeling methodologies, uncertainty modeling, and robustness validation. These issues are reviewed in this article. A smart structure with piezoelectric (PZT) materials is investigated for its active vibration response under dynamic disturbance. Numerical modeling with finite elements is used to achieve that. The vibration for different model values is presented considering the uncertainty of the modeling. A vibration suppression was achieved with a robust controller and with a reduced order controller. Results are presented for the frequency domain and the state space domain. This work cleary demostrated the advantage of robust control in the vibration suppration of smart stuctures. Full article

(This article belongs to the Special Issue Recent Advances and Challenges in Emerging Power Systems)

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Open AccessArticle

Compromised Vibration Isolator of Electric Power Generator Considering Self-Excitation and Basement Input

Young Whan Park

Tae-Wan Kim

and

Chan-Jung Kim

Inventions 2023, 8(1), 40; https://doi.org/10.3390/inventions8010040 - 02 Feb 2023

Viewed by 601

Abstract

A previous study proposed an optimal vibration isolator for self-excitation, but the solution results showed a critical drawback for the basement input. Because the plant system is exposed to self-excitation and basement input, the vibration isolator characteristics must meet all the requirements of both excitation cases. Two performance indices of the vibration isolator were introduced to evaluate the vibration control capability over two excitation cases, self-excitation and basement input, using the theoretical linear model of the electric power generator. The compromise strategy was devoted to enhancing the vibration control capability over the basement input, owing to the acceptable margin for self-excitation. The modification of the mechanical properties of the vibration isolator focused on the isolator between the mass block and the surrounding building. Simulation results revealed that an increase in the spring coefficient and a decrease in the damping coefficient of the vibration isolator beneath the mass block could enhance the vibration reduction capability over the basement input. Full article

(This article belongs to the Special Issue Recent Advances and Challenges in Emerging Power Systems)

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Open AccessArticle

Organization of Control of the Generalized Power Quality Parameter Using Wald’s Sequential Analysis Procedure

and

Inventions 2023, 8(1), 17; https://doi.org/10.3390/inventions8010017 - 10 Jan 2023

Cited by 1 | Viewed by 728

Abstract

This paper analyzes the key defining features of modern electric power distribution networks of industrial enterprises. It is shown that the requirements set by industrial enterprises with respect to power quality parameters (PQPs) at the points of their connection to external distribution networks of utilities have been becoming increasingly strict in recent years. This is justified by the high sensitivity of critical electrical loads and distributed generation facilities to distortions of currents and voltages from a pure sine wave. Significant deviations of PQPs lead to significant damage at the consumer end due to the shutdown of electrical equipment by electrical and process protections as a result of overheating and increased wear and tear of individual elements of process lines. This necessitates the implementation of continuous monitoring systems at industrial enterprises, or sampling-based monitoring of PQPs at the boundary bus with an external distribution network. When arranging sampling-based monitoring of PQPs at certain time intervals, only those parameters that are critical for specific electrical loads should be calculated. We provide a rationale for the transition from the monitoring of a set of individual PQPs to a generalized PQP with the arrangement of simultaneous monitoring of several parameters. The joint use of the results of simulation and data from PQP monitoring systems for PQP analysis using the sampling-based procedure produces the desired effect. We present an example of a sequential decision-making process in the analysis of a generalized PQP based on Wald’s sequential analysis procedure. This technique makes it possible to adapt the PQP monitoring procedure to the features of a specific power distribution network of an industrial enterprise. We present the structural diagram of the device developed by the authors, which implements the sampling-based monitoring procedure of the generalized PQP. We put forward an approach for determining the average number of sampling data points required to make a decision about the power quality in the implementation of the sequential analysis procedure. Full article

(This article belongs to the Special Issue Recent Advances and Challenges in Emerging Power Systems)

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Open AccessArticle

Research of Static and Dynamic Properties of Power Semiconductor Diodes at Low and Cryogenic Temperatures

and

Inventions 2022, 7(4), 96; https://doi.org/10.3390/inventions7040096 - 18 Oct 2022

Cited by 1 | Viewed by 1190

Abstract

Systems with high-temperature superconductors (HTSC) impose new requirements on power conversions, since the main part of the losses in such systems is induced in the semiconductors of the converters. Within the framework of this study, the possibility of improving the static and dynamic characteristics of power semiconductor diodes using cryogenic cooling was confirmed; in some cases, a loss reduction of up to 30% was achieved. Full article

(This article belongs to the Special Issue Recent Advances and Challenges in Emerging Power Systems)

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Open AccessArticle

Energy-Saving Load Control of Induction Electric Motors for Drives of Working Machines to Reduce Thermal Wear

Tareq M. A. Al-Quraan

and

Inventions 2022, 7(4), 92; https://doi.org/10.3390/inventions7040092 - 12 Oct 2022

Viewed by 967

Abstract

The influence of reduced voltage on the service life of an induction motor is considered in this article. An algorithm for calculating the rate of thermal wear of induction motor insulation under reduced supply voltage depending on the load and the mechanical characteristics of the working machine has been developed. It determines the change in the rate of thermal wear under alternating external effects on the motor (supply voltage and load) and allows forecasting its service life under these conditions. The dependency graphs of the rate of insulation thermal wear on the motor load for various levels of supply voltage and various mechanical characteristics of working machines are provided in the work. It was determined that the rate of thermal wear of the induction motor insulation increases significantly when the voltage is reduced compared to its nominal value with nominal load on the motor. The authors propose to consider this fact for resource-saving control of the motor. The paper presents the results of experimental verification of the obtained rule for “Asynchronous Interelectro” (AI) series electric motors that confirm its accuracy. Based on the obtained correlation, the rule of voltage regulation in energy-saving operation mode has been derived. The proposed rule takes into account the thermal impact on the electric motor running in energy-saving mode and enables saving its resource, which, in turn, results in extending its service life. The research does not consider additional effects on the electric motor except the thermal one. Full article

(This article belongs to the Special Issue Recent Advances and Challenges in Emerging Power Systems)

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