Output voltage control of a four-leg inverter based three-phase UPS utilizing stationary frame resonant filter banks

Date

2007-09-05

Author

Hava, Ahmet Masum

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An all scalar PWM and control approach for the four-leg inverter based three phase transformerless UPS is proposed. The output voltage of each phase is controlled independently and its controller is formed by a stationary frame resonant filter bank accompanied with proportional control and output capacitor current based active damping loops. The resonant filter bank consists of the fundamental component controller and one controller for each dominant harmonic. The simple to implement scalar control method exhibits superior overall steady-state and dynamic performance in the UPS application. Utilizing the inverter zero-state partitioning, a generalized form of scalar PWM for the four-leg inverter is developed. A novel minimum loss discontinuous PWM (MLDPWM) method, which provides minimum switching losses under all operating conditions (including unbalanced load operation) is derived. This simple scalar method provides superior performance and unlike the vector methods it is easy to implement. The controller and modulator design and implementation details for the system are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The scalar control and PWM methods are proven by means of theory, simulations, and thorough laboratory experiments of a 5 kVA UPS system.

Subject Keywords

Zero sequence, Unbalanced load, Crest factor, THD, Harmonic, Dynamic response, Voltage regulation, Active damping, Filter bank, Resonant filter, Scalar control, Scalar PWM, VS, UPS, four-leg inverter

URI

https://hdl.handle.net/11511/36812

DOI

https://doi.org/10.1109/epe.2007.4417442

Conference Name

2007 European Conference on Power Electronics and Applications

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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Output voltage control of a four-leg inverter based three-phase UPS by means of stationary frame resonant filter banks Demirkutlu, Eyyup; Cetinkaya, Sueleyman; Hava, Ahmet Masum (2007-05-05) A method for high performance output voltage control of a four-leg inverter (FLI) based three-phase UPS is proposed. Stationary frame resonant filter bank based output voltage control loop, which is complemented by capacitor current feedback based active damping loop, is employed. Utilizing the zero-state partitioning variable, a generalized form of scalar PWM for the FLI is developed and the minimum loss discontinuous PWM method is derived. The controller and modulator design and implementation details for...
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Citation Formats

A. M. Hava, “Output voltage control of a four-leg inverter based three-phase UPS utilizing stationary frame resonant filter banks,” presented at the 2007 European Conference on Power Electronics and Applications, Aalborg, DENMARK, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36812.