- AG C4.1: Strategic Directions
- AG C4.2: Institutional Liaison
- AG C4.3: Tutorials and Conferences
- JWG A1/C4.52 Wind generators and frequency-active power control of power systems
- JWG A2/C4.309 Electrical Transient Interaction between Transformers and the Power System
- JWG A2/C4.52 High-frequency transformer and reactor models for network studies
- JWG A3/B5/C4.37 System conditions for and probability of Out-of-Phase
- JWG B4/B1/C4.73 Surge and extended overvoltage testing of HVDC Cable Systems
- JWG C1/C4.36 Review of Large City & Metropolitan Area power system development trends taking into account new generation, grid and information technologies
- JWG C2/C4.37 Recommendations for Systematic Framework Design of Power System Stability Control
- JWG C4.24/CIRED Power Quality and EMC Issues Associated with Future Electricity Networks
- JWG C4.31/CIRED EMC between Communication Circuits and Power Systems
- JWG C4.40/CIRED Revisions to IEC Technical Reports 61000-3-6, 61000-3-7, 61000-3-13, and 61000-3-14
- JWG C4.42/CIRED Continuous assessment of low-order harmonic emissions from customer installations
- JWG C4/B4.38 Network Modelling for Harmonic Studies
- JWG C4/B4/C1.604 Influence of Embedded HVDC Transmission on System Security and AC Network Performance
- JWG C4/B5.41 Challenges with series compensation application in power systems when overcompensating lines
- JWG C4/C6.29 Power Quality Aspects of Solar Power
- JWG C4/C6.35/CIRED Modelling and dynamic performance of inverter based generation in power system transmission and distribution studies
- WG C4.111 Review of LV and MV Compatibility Levels for Voltage Fluctuation
- WG C4.112 Power Quality Monitoring in Flexible Power Networks
- WG C4.206 Protection of the High Voltage Power Network Control Electronics Against Intentional Electromagnetic Interference (IEMI)
- WG C4.207 EMC with communication circuits, low voltage systems and metallic structures
- WG C4.208 EMC in HV Substations and Generating Stations
- WG C4.23 Guide to Procedures for Estimating the Lightning Performance of Transmission Lines
- WG C4.25 Issues related to ELF Electromagnetic Field exposure and transient contact currents
- WG C4.26 Evaluation of Lightning Shielding Analysis Methods for EHV and UHV DC and AC Transmission-lines
- WG C4.27 Benchmarking of Power Quality Performance in Transmission Systems
- WG C4.28 Extrapolation of measured values of power frequency magnetic fields in the vicinity of power links
- WG C4.30 EMC in Wind Generation Systems
- WG C4.303 Pollution and Environmental Influence on Electrical Performance
- WG C4.305 Practices in Insulation Coordination of Modern Electric Power Systems Aimed at the Reduction of the Insulation Level
- WG C4.306 Insulation Coordination of UHV AC systems
- WG C4.307 Resonance and Ferroresonance in Power Networks and Transformer Energization Studies
- WG C4.32 Understanding of the Geomagnetic Storm Environment for High Voltage Power Grids
- WG C4.33 Impact of Soil-Parameter Frequency Dependence on the Response of Grounding Electrodes and on the Lightning Performance of Electrical Systems
- WG C4.34 Application of Phasor Measurement Units for monitoring power system
- WG C4.36 Winter Lightning – Parameters and Engineering Consequences for Wind Turbines
- WG C4.37 Electromagnetic Computation Methods for Lightning Surge Studies with Emphasis on the FDTD Method
- WG C4.39 Effectiveness of line surge arresters for lightning protection of overhead transmission lines
- WG C4.407 Lightning Parameters for Engineering Applications
- WG C4.408 Lightning Protection of Low-Voltage Networks
- WG C4.409 Lightning Protection of Wind Turbine Blades
- WG C4.410 Lightning Striking Characteristics to Very High Structures
- WG C4.43 Lightning problems and lightning risk management for nuclear power plants
- WG C4.44 EMC for Large Photovoltaic Systems
- WG C4.45 Measuring techniques and characteristics of fast and very fast transient overvoltages in substations and converter stations
- WG C4.501 Numerical Electromagnetic Analysis and Its Application to Surge Phenomena
- WG C4.502 Power system technical performance issues related to the application of long HVAC cables
- WG C4.503 Numerical techniques for the computation of power systems, from steady-state to switching transients
- WG C4.603 Analytical Techniques and Tools for Power Balancing Assessments
- WG C4.605 Modelling and aggregation of loads in flexible power networks
JWG C2/C4.37 Recommendations for Systematic Framework Design of Power System Stability Control
Ensuring the reliable operation of the power system has always been a top priority in both industrial practice and academic research. CIGRE has undertaken extensive activities in the field of power system stability control by timely integrating requirements of power systems, with the most up-to-date understanding and technologies. High-quality brochures have been published including TB No.36 “Control of Power Systems during Disturbed and Emergency Conditions” (1989), TB No.155 “Advanced Angle Stability Controls” (December 1999),TB No.231 “Definition and Classification of Power System Stability” (June 2003), TB No.316 “Defense Plan against Extreme Contingencies” (April 2007), TB No.325 “Review of On-Line Dynamic Security Assessment Tools and Techniques” (June 2007), TB No.330 “Wide Area Monitoring and Control for Transmission Capability Enhancement” (August 2007), and so on. Also in recent years, more and more attention has been paid to on-line dynamic security assessment tools, wide area monitoring and control system, and many related applications have been extensively reported in various CIGRE conferences and events.
However, recent major blackouts and system wide events have highlighted some of the potential limitations of current stability controls and designs in helping to prevent system wide stability problems. These deficiencies normally manifest themselves directly in aspects of design and maintenance of control systems, but in a deep sense may indirectly result from insufficient attention to the systematic framework design of stability control, or inadequate adaptability of control decisions to changes in grid topology and operating condition, or incomplete consideration given to the coordination among various types of control technologies. This may naturally result from the fact that in the past more attention was paid to the principle and suitable application scope of each specific technology as it became mature. Up to now, less effort has been made to address the systematic framework design of power system stability control by taking full consideration of the unified coordination of various control technologies corresponding to different evolution stages of the disturbed power system. In fact, in the field of power system stability control, definitions and classifications are still not precise and consistent, and understanding on how different control types affect each other are not very clear. Also, proper sharing of information among all entities (TSOs, DSOs, Generators…) is crucial to control coordination, particularly in a large synchronous grid.
This has created a need to develop a systematic basis for designing power system stability control framework from a global and coordinated perspective. The aim of this WG is to build a coordinated systematic framework of power system stability control, with an integration of different types of power system stability control technologies, and considering spreading renewable energy sources.
- Proposal & analysis of definitions and classifications of power system stability control which cover the whole process of power system operation and are most suitable for the systematic control framework design. Theoretical analysis and industrial observations show that the classification should be based on control action timing and include the following four types, i.e. preventive control, emergency control, corrective control and restoration control.
- Proposal & analysis of characteristics of various types of control technologies and their interrelations with particular emphasis on control coordination from a global perspective. For instance, preventive control is an operation style with the aim of ensuring reliable power supply without grid fault or subsiding system dynamics after grid faults. Emergency control aims at the specific grid fault that suddenly occurs and would cause system instability, and automatically activates generator tripping, load shedding, HVDC ramping, fast valving, dynamic braking, emergency forced excitation, and potential renewable generation source disconnection and so on, in order to ensure power system stability.
- Proposal & analysis of key aspects and system performance for designing a systematic framework of power system stability control, referring to key techniques of identifying a clear scope of application for each type of control, and coordinating all types as a whole. For instance, any implemented preventive control may affect system stability and also affect type, location and quantity of emergency control in case of grid faults which may occur in the future. Both the system configuration and the decision-making of emergency control not only are affected by available preventive control measures but also have an impact on the configuration schemes of corrective control. Once an emergency control system is activated, its control effects have direct influence on actions of corrective control. Coordination among various control types is necessary. A systematic framework for the implementation of this coordination needs to be developed.
- The framework recommended by this WG will address the following issues: (1) essentials for the implementation of control adaptability and coordination; (2) functional structure of the framework integrating information processing, stability analysis and control decision-making; (3) analysis on the mechanism of integrating and coordinating various types of stability controls.
- The group aims at promoting the strategies and practice of coordination among preventive control, emergency control, corrective control and restoration control, rather than conducting research on any new type of control technology. In making recommendations, full consideration will be given to compatibility to the current practice of dynamic security analysis and stability control systems.
Convener: Y. Fang (China)