Stability Problems and Countermeasures in New Power Systems

Dear Colleagues,

We are inviting submissions to a Special Issue of Energies entitled "Stability Problems and Countermeasures in New Power Systems".

Over the past two decades, electronic, information, communication, and measurement and control technology have rapidly developed and converged. Simultaneously, the increasing demand for electrical energy in human society’s production and daily life has brought profound changes in electricity production, transmission, distribution, and consumption. The same applies to protection and control. These changes have led to a transition from traditional to new power systems.

The most notable feature of the new power system is the “double high” characteristics, with a high proportion of new energy sources and a high proportion of power electronic devices. On the one hand, factors like carbon emissions, environmental protection, and energy security have driven substantial development of renewable energy sources, such as wind and solar power, in major countries worldwide over the past two decades. On the other hand, with the advancement of power electronic technology, especially high-power electronic devices, power electronic equipment has found extensive applications on both the transmission and load sides. Presently, technologies like line-commuted high-voltage direct current (LCC-HVDC) transmission, voltage-source high-voltage direct current (VSC-HVDC) transmission, and flexible alternating current transmission systems (FACTS) are widely used in power grids. Due to the digitalization of human society, the demand for DC loads, such as data and network centers, has grown dramatically. Moreover, many traditional AC loads have been electrified for improved performance and efficiency, leading to significant changes in load characteristics and dynamic behaviors.

The “double high” characteristics have altered the coupling among power equipment and the dynamic behavior of power systems. The widespread replacement of synchronous generators with inverter-based power sources has resulted in lower system inertia and reduced short-circuit capacity, which, in turn, has complicated power system stability issues. The most prominent manifestation of these changes is the shift in the dominant oscillation modes of power systems from low-frequency oscillations to wide-band oscillations spanning from several hertz to kilohertz. Additionally, the low inertia, damping, low support, and low overshoot characteristics of renewable energy sources have reduced the power system's ability to withstand fault disturbances. The resulting frequency and voltage problems may cause severe or cascading failures.

The intermittency, randomness, and volatility of renewable energy sources have increased the challenges related to power and voltage regulation in power systems. Issues concerning system power balance and operational security have become more complex. Due to factors such as mismatches between renewable energy output and load, transmission constraints, traditional generator startup and regulation costs, and capacity limitations, there are situations where renewable energy sources experience severe curtailment, leading to wasted wind and solar resources; this negatively affects the economic efficiency and carbon emissions of system operation.

Technologies like pumped storage, electrochemical energy storage, and compressed air energy storage have seen increasing applications in power systems in recent years. Additionally, distributed generation, electric vehicles, electric heating, and heat storage electric boilers, among other devices, have found extensive use on the consumer side. While these devices offer flexible regulation capabilities, their functions vary significantly and serve different economic entities. Therefore, it is essential to mobilize these flexible resources through technical and market means from a holistic perspective to enhance system operation's stability and economic efficiency.

Integrating many renewable energy sources, energy storage, electric vehicles, and other devices has increased the complexity of power system operation and reduced the system's ability to perceive information. Existing technological methods are inadequate to ensure the safety and economic requirements of the new power systems. The latest technologies, such as the Internet of Things (IoT) and artificial intelligence (AI), offer feasible solutions to address these challenges.

The particular topics of interest for this Special Issue include, but are not limited to, the following:

• Analysis and Mitigation of Wide-Band Oscillations in Power Systems;
• Frequency and Voltage Stability Problems Caused by Renewable Energy Generation;
• Integration of Renewable Energy Sources;
• Application of Energy Storage Technologies;
• Virtual Power Plants and Active Distribution Networks;
• Power Markets;
• Novel Measurement and Control Technologies in Power Systems;
• Applications of the Internet of Things and Artificial Intelligence Technologies in Power Systems.

Prof. Dr. Qirong Jiang
Dr. Liang Wang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• renewable energy generation
• electrified power
• wide-band oscillations
• energy storage
• frequency stability
• voltage stability
• power markets
• virtual power plants
• active distribution networks
• Internet of Things (IoT)
• Artificial Intelligence (AI)