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Power flow analysis of power systems with STATCOM is reviewed. A new method for the power flow calculation of a power system with STATCOM operating in voltage control mode is introduced. Unlike the common practice where the real power loss of STATCOM is ignored, the proposed procedure accommodates this loss by including the equivalent resistance of the STATCOM in power flow calculation.The new method is applied for the IEEE 30-bus test system. The results show that the proposed method possesses excellent convergence characteristics.

Voltage source Inverter (VSI) technology, suitable for synchronous motor applications, now exists with high power ratings producing high output voltage (≥11kV) with significant benefits over the widely used load commutated inverter (LCI) drives. The paper covers an existing VSI technology applied for the first time at a higher operating voltage. This 15.5 MW, 11 kV VSI Adjustable Speed Drive (ASD) installation is used to soft start three synchronous motors and speed control of one of these for a process gas compressor application. Challenges faced during commissioning are described and associated solutions are presented. A failure analysis of the ASD during commissioning is presented. An ASD design review was undertaken which has resulted in an improved alternative to the conventional HV busbar design. A protection co-ordination study incorporating incoming switchgear and internal drive protection functions is presented. Improved protection schemes and settings are described to obtain faster coordinated fault clearance and improved ASD availability. The paper provides operating experience since the modified ASD was placed in service in January 2006. Key recommendations are made to enhance the reliability, availability and performance of medium voltage drive systems. Also, suggestions are made for additions to the 2006 IEEE 1566 medium voltage ASD standard.Index Terms -High power rating adjustable speed drive, medium voltage, voltage source inverter, failure analysis, protection, reliability, availability.

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