Variable linear or nonlinear loads are critical for testing AC power supplies and power equipment in various operating conditions. At present, most testing loads are based on bulky resistors, capacitors, and inductors on which the testing energy is consumed to generate excessive heat, and moreover, the impedance value is limited by finite combination of these bulky loads. Some commercial electronic loads are available, which provide flexible impedance control but the energy absorbed by the load is still dissipated as heat.
The work presented in this paper is a continuous effort of UCI Power Electronics AC load project. A Regenerative AC Electronic Load (RACEL) is developed with One-Cycle Controller (OCC), which doesn't require any Digital Signal Processor (DSP) and software in the control loop. Using a reconfigurable FieldProgrammable Analog Array (FPAA), the OCC can be integrated into a single FPAA with easy reconfiguration and simple interface structure. The proposed RACEL can emulate any impedance load, linear or nonlinear as well steady or dynamic with the regeneration of the testing energy. Simulation and experimental results are presented to verify the proposed RACEL performance.
This paper describes various problems in transmission and distribution systems and demonstrates the significance of reactive power management. Static VAR compensator and STATCOM principles of operation and power characteristics are described. The most common types of multilevel voltage source converters used in STATCOM applications are comparatively analyzed. The most promising topology of multi-level Hexagram converter is adduced. The efficiency of dual-core OCC controller for the non-active current management operational mode of Hexagram converter based STATCOM is proved
Variable linear or nonlinear loads are necessary for testing medium voltage (MV) high power AC power supplies. Generally, those AC power supplies require performance validation, burn-in, and/or life-time testing under different load conditions, defined by the end-user or standards for the given applications. For this purpose, this paper presents a multilevel converter-based AC regenerative electronic load with One-Cycle Control (OCC), which is based on a five-level diode-clamped multilevel converter and can emulate any impedance load, whether linear or nonlinear, steady or dynamic. Simulation and experimental results are presented to verify the performance of the proposed multilevel AC regenerative load.
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