Abstract
Industrial motor systems make up a quarter of all electric sales in the United States. Variable speed drives (VSDs) can provide energy efficiency savings to the customer by regulating motor speed based on specific and varying needs. In addition to the benefits provided to the customer, VSDs can provide support to the grid through ancillary services. The Center for Ultra-Wide-Area Resilient Electric Energy Transmission Networks (CURENT) developed a power electronics converter-based grid emulator to allow testing of various power system architectures and demonstration of key technologies in monitoring, control, actuation, and visualization. This paper proposes using an active front-end VSD's connected motor load to provide frequency regulation to a large scale power grid. Each part of the emulator is described including motor and power electronics model and control. The proposed frequency regulation is implemented in VSDs and modeled in both a transmission system in EMTDC/PSCAD and verified on CURENT's hardware testbed.
Highlights
Industrial induction motors are considered the workhorse for industry because of their low cost and robust construction
EXPERIMENTAL RESULTS The proposed frequency regulation is implemented in variable speed drives (VSDs) and modeled in both a transmission system in EMTDC/PSCAD and verified on the Hardware Testbed (HTB) platform
To verify the behavior of the VSD and the frequency regulation on the HTB, it was tested in a single area cabinet
Summary
Industrial induction motors are considered the workhorse for industry because of their low cost and robust construction. Induction motors are used in a wide range of industries, such as oil, mining, power, marine, paper, and wastewater. An induction motor can be connected directly to the 60 Hz power grid and will operate at a relatively constant speed. Motor drives consist of two conversion phases– AC to DC and DC to AC or rectifier and inverter respectively. The motor drive consists of two parts: the inverter and the rectifier. The three-phase AC side of the inverter is connected to the motor load, and the three-phase AC side of the rectifier is connected to the three-phase power grid. Most motor drive systems are referred to as adjustable speed drives (ASDs) or variable speed drives (VSDs)
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