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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 2.1. Power Controller Components and Function The operation and power conversion functions of the microturbine are controlled by the power controller. Major components of the power controller are two 3-phase inverters, power- conditioning equipment, a microprocessor-based system controller, and an auxiliary power supply for the controls. The output power requirements for voltage and current including fault limits can be found in the Model C30 Electrical (410000), Model C65 Electrical (410001), Model C200 (410066) and C1000 Series (410072) Technical Reference documents. Voltage and current harmonics of the power controller conform to IEEE 519-19921 at rated power. Other power controller functions include: • Supervisory control of the microturbine operation (including protective relay functions) • Microturbine safety supervision • Internal communications with auxiliaries • External communications with the user and with other equipment 3. Grid Connect Features When connected to an energized grid, the power controller inverter supplies current into the grid. Under these conditions, the power controller follows the prevailing grid voltage and frequency. NOTE: Due to line and/or transformer impedance, the current produced by the Capstone Microturbine may change the voltage at the point of connection. Power delivered by the power controller is proportional to the product of current flow and the line voltage. The power controller will deliver constant power, subject to power controller hardware current limits, until the user initiates a control change or one of the protective relay functions described below becomes active. The algorithms used to operate the power controller provide excellent protection against islanding2 in the absence of utility-supplied grid voltage. Near short or near open islands are detected within a few cycles through loss of current control. Islands whose loads are more closely matched to the power controller output will be detected by the Rate of Change of Frequency and built-in Active Anti-Islanding protection. 1 IEEE 519-1992. IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems. Institute of Electrical and Electronics Engineers, New York. 2 Islanding: “A condition in which a portion of the utility system that contains both load and operating generation, which is not under utility control, remains energized while isolated from the remainder of the utility system. 410033 Rev H (December 2013) Page 6 of 17 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Protective Relay Functions for Capstone Microturbines
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