초록 ▼

Disclosed is a device and method to control the conversion of an arbitrary resource energy into mechanical energy and subsequently into electric energy with a variable-speed generation system utilizing a turbine and a doubly-fed generator, to be connected directly to a power grid of a certain grid f

Disclosed is a device and method to control the conversion of an arbitrary resource energy into mechanical energy and subsequently into electric energy with a variable-speed generation system utilizing a turbine and a doubly-fed generator, to be connected directly to a power grid of a certain grid frequency. Via electronic control of the rotor speed by controlling the rotor winding excitation frequency, the device has the capability of providing an optimum tradeoff in maximum turbine efficiency and minimal generator losses to secure maximum efficiency of the total conversion process, irrespective of varying resource and electric load conditions. The excitation requirements of the generator are confined to moderate levels and yet a wide rotor-speed variation margin, starting from zero speed, is permitted. An integrated strategy is implemented which effectively coordinates the execution of these tasks and the independent control of the generator terminal voltage as well as the active and reactive electric power output. All signal processing as required correspondingly is carried out without the need for cumbersome measurements of turbine input and output power or generator losses.

대표청구항 ▼

An energy conversion generation system for receiving resource energy from a resource and converting the resource energy into an electrical power output for supply to a polyphase electric power grid operating at a system frequency, the energy generation conversion system comprising: a variable speed

An energy conversion generation system for receiving resource energy from a resource and converting the resource energy into an electrical power output for supply to a polyphase electric power grid operating at a system frequency, the energy generation conversion system comprising: a variable speed generation system including turbine means for converting a resource energy input from the resource into mechanical energy at a rotor speed; energy converter means for producing excitation power; a doubly fed generator coupled to the turbine means and having a rotor with excitation rotor windings and with means for applying the excitation power from the energy converter means to the rotor windings, the rotor being driven by the mechanical energy from the turbine means, and a stator with stator windings to supply the electrical power output to the power grid; and control means for varying the rotor speed in response to the power output and resource energy input to increase the ratio of the electrical output power to the resource energy input received from the resource.