Exact analysis of a multipulse shunt converter compensator or Statcon. Part 1: Performance

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Exact analysis of a multipulse shunt converter compensator or Statcon. Part 1: Performance

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As the converter we take a voltage sourced inverter bridge with perfect switches. There is a single capacitor on the d.c. side and the output is connected to an a.c. system through an inductive link. By changing the phase, thetaso, of the operation of the inverter switches relative to phase of the a.c. system, the voltage across the capacitor can be controlled thus controlling the magnitude of the fundamental of the inverter a.c. output voltage. The difference between the inverter output voltage and the a.c. system voltage determines the flow of reactive power through the linking inductor to or from the system. Analysis shows that the reactive power is approximately given by the simple relationship $$ Q\approx-{V^2\over X}[q_1+q_2\theta_{ob}] $$ where X is the reactance of the inductive link, R is the combined resistance of the link and bridge and thetasob = 2Xthetaso/R is a control parameter. The coefficients q1 and q2 are functions mainly of √(XY) where Y is the susceptance of the capacitor at supply frequency and of the number of pulses in the inverter; q1̂ is small and q2 ≃ 0.5 for a well-designed equipment. There is a size of the passive elements below which the performance of the compensator is poor and above which it is not greatly enhanced. The required passive components are smaller than are needed for a compensator formed from switched capacitors and thyristor controlled inductors. Increasing the number pulses in the inverter by using phase shifting transformers, reduces the size of the passive components that are required as well as reducing the magnitude of the harmonic currents in the output.

Inspec keywords: capacitors; invertors; compensation; phase shifters; switching circuits; electric reactance; transformers; voltage control; harmonics

Other keywords: thyristor controlled inductors; inductive link reactance; phase shifting transformers; harmonic currents reduction; passive elements; perfect switches; steady state analysis; voltage sourced inverter bridge; inverter output voltage; reactive power flow; Statcon; multipulse shunt converter compensator; inverter AC output voltage; DC side capacitor; susceptance; voltage control

Subjects: Inductors and transformers; Control of electric power systems; Power convertors and power supplies to apparatus; Voltage control; Capacitors

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