Power Supply-Demand Asymmetry and Power Quality Issues in High-Renewable Energy Power Systems

Dear Colleagues,

In the context of global energy low-carbon transformation, a high proportion of new energy access involves promoting the transformation of power system operation modes from "source with load" to "source-grid-load-storage" collaborative interaction. This change leads to new characteristics of the system. The symmetry of power supply and consumption is broken. The transient and steady-state disturbance phenomenon, caused by the differences in source, network, and load operation characteristics, is highly complicated. Consequently, this makes power quality problems such as voltage deviation, flicker, and harmonics increasingly prominent. Moreover, the introduction of new energy storage, such as hydrogen energy storage, aggravates the complexity of the system. At the same time, the regulatory effect of multi-energy flow synergy and the electricity–carbon market mechanism has not been fully exerted. Challenges remain in effectively addressing the symmetrical demands of both supply and demand sides. However, the traditional governance strategy has obvious shortcomings in terms of sensitivity, modeling accuracy, and system evaluation. In addition, the existing equipment can hardly meet the needs of the new power system. Therefore, it is urgent to study accurate modeling and analysis methods for power quality, carry out research and the development of new governance equipment, and explore the optimal governance strategy under multi-energy flow coordination and the electricity–carbon market mechanism.

The topics of interest for this planned issue of Symmetry include but are not limited to the following:

• Voltage sag perception, warning, location and treatment technology;
• Transient characteristic analysis of AC/DC power grid under voltage sag conditions;
• The division of harmonic responsibility;
• Harmonic power flow algorithms considering distributed generation;
• Study of generation, propagation characteristics, and influence of ultra-high harmonics;
• Harmonic monitoring and analysis of new power system;
• Harmonic characteristics of AC/DC hybrid power system;
• Frequency stability assessment of high-proportion renewable energy power system;
• Harmonic source load identification;
• Three-phase imbalance management;
• Power quality data application;
• Power quality in integrated energy systems;
• The modeling of power quality interference sources;
• The optimization and management of power quality problems in new power systems;
• Three-phase unbalanced power flow analysis technology;
• Power quality analysis and economic research;
• Multi-energy flow optimizes the management of power quality problems;
• Power quality characteristics of grid-connected hydrogen energy storage;
• The electric carbon market optimizes the management of power quality problems.

Dr. Yi Zhang
Prof. Dr. Cheng Guo
Guest Editors

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• voltage sag
• harmonic responsibility
• harmonic power
• supraharmonic
• integrated energy system
• power quality data
• power flow analysis
• interference modeling
• power quality analysis
• multi-energy flow coupling
• hydrogen storage characteristics
• electric carbon market