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CHAPTER 3 Capstone SYSTEM DESCRIPTION Load Controller The Load Controller on a 200 kW power module is one of the primary digital controllers. It is responsible for converting power from the high power DC bus to the customer’s desired AC output voltage and frequency, or in the reverse direction to start the engine. In a Grid Connect system, the Load Controller automatically matches the existing voltage and frequency of the customer’s grid. Generator Controller The Generator Controller on each 200 kW power module is dedicated to fully active speed control of the permanent magnet AC generator/motor. This controller provides high frequency AC power to initially accelerate the turbine/generator rotor to the required starting speed using power from the DC bus. Once the system lights off, the generator controller maintains the speed of the engine as required by output power demand. The Generator Controller converts the variable high frequency AC generator output to DC power for the high voltage DC bus. This controller also has control of the safety valve that opens and dumps compressed air overboard in the event of a loss of speed control, and a brake resistor that can be used to control excess power on the DC bus. Fuel Controller The Engine Controller on each 200 kW power module provides fuel control, ignition, engine temperature control, and monitors all engine sensors. The engine controller initiates the lighting sequence of the engine once the Generator Controller has accelerated the turbine generator rotor to the speed required for light-off. When ignition is detected, fuel flow is controlled to maintain an exhaust temperature set-point. The fuel control system independently controls each of the six injectors in order to maintain temperatures and is integral to the low emission and high efficiency of the MicroTurbine system. Battery Controllers Each 200 kW power module in Stand-Alone or Dual Mode configurations has two identical Battery Controllers that convert battery DC bus voltage from the two large DC batteries to system high power DC bus voltage. These controllers are responsible for the sourcing or sinking of power as necessary to regulate the DC bus. On Grid Connect configurations the inverter is used in place of the Battery Controllers to regulate DC bus voltage using grid power. During a start on a Stand Alone system, the Battery Controllers are responsible for turning on and charging the system’s high power DC bus. Battery health and monitoring software resides in the Battery Controllers to manage the charge of the system’s batteries and optimize battery life. System Controller The System Controller on a 200 kW power module is responsible for overall management of MicroTurbine operation and interfaces with the C1000 controller. The individual controllers described above are controlled, monitored and sequenced for complete system control. The system controller receives commands from the C1000 controller or can be serviced through Ethernet communications using CRMS software. The system controller logs all system faults and records data prior to, during, and after all logged faults for the last 20 faults on record. As an additional safety feature, it has control of all low voltage DC power to the fuel valves and will disable the fuel system, independent of the Engine Controller, in the event of a fault. 410072 Rev A (January 2009) Page 3-8 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 | CAPSTONE C1000 MICROTURBINE SYSTEMS TECHNICAL REFERENCE
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