Working groups area AG 1  Strategic Advisory Group AG 2  WG Conception and Guidelines AG 3  Environmental Issues AG 4  HVDC System Performance B4-34  Capacitor Commutated Converters HVDC Interconnections: Digital Modeling and Benchmark Circuit B4-38  Simulation of HVDC and FACTS B4-39  Integration of Large Scale Wind Power with HVDC and Power Electronics B4-40  Static Series Synchronous Compensator (SSSC) B4-41  Systems with Multiple HVDC Infeed B4-43  Increased System Efficiency by Use Of New Generations of Power Semiconductors B4-44  Planning Guidelines Dealing with HVDC Environmental Issues B4-45  Technological Assessment of 800 kV HVDC Applications B4-46  Voltage Source Converter (VSC) HVDC for power transmission - Economic Aspects and comparison with other AC and DC technologies B4-47  Special Issues in AC Filter Specifications for HVDC JWG B2.17/B4/C1  Impacts of HVDC Lines on Economics of HVDC Projects JWG A2/B4-28  HVDC Converter Transformer Test Procedures B4-48  Testing of VSC System for HVDC applications B4-49  Performance Evaluation and Applications Review of Exsiting Thyristor Control Series Compensation Devices