Switch-mode var compensator with minimized switching losses and energy storage elements
- Minnesota Univ., Minneapolis, MN (USA). Dept. of Electrical Engineering
The main advantages of a switch-mode var compensator (SMVC) which employs a voltage source force-commutated inverter include minimum energy storage elements, continuous and fast reactive power control. However, various problems still exist. The main problems are device switching losses and electromagnetic interference (EMI) since the devices in the inverter operate in a force-commutated mode. To minimize these problems, this paper proposes a so-called parallel-resonant dc link (PRDCL) circuit topology as an interface between dc voltage supply and the inverter to provide a short zero voltage period in the dc link of the inverter to allow zero voltage switchings in the SMVC. The proposed circuit along with SMVC can compensate for leading and lagging displacement power factor with a high switching frequency at significantly reduced switching losses. The new circuit is especially suitable for high power SMVC applications using GTOs or other gate turn-off devices. The proposed circuit is analyzed in detail and its operation principle is explained. Several design considerations are addressed and the design formulas are obtained. The new topology and the overall system are verified by computer simulations.
- OSTI ID:
- 6927684
- Journal Information:
- IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (USA) Vol. 5:1; ISSN ITPSE; ISSN 0885-8950
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
240100* -- Power Systems-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPUTERIZED SIMULATION
CONTROL SYSTEMS
DESIGN
DISTURBANCES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC FIELDS
ELECTRONIC CIRCUITS
ENERGY STORAGE
ENERGY SYSTEMS
EQUIPMENT
INVERTERS
MATHEMATICS
POWER SYSTEMS
SIMULATION
STORAGE
SWITCHING CIRCUITS
TOPOLOGY
VAR CONTROL SYSTEMS