A control system for a power generation system includes a generator coupled to a turbine via a shaft. The control system includes a memory storing instructions. The control system also includes a processor coupled to the memory and configured to execute the instructions. When the instructions are executed it causes the processor to receive a direct current (DC)-link voltage from an automatic voltage regulator (AVR), wherein the AVR is configured to control voltage characteristics of the generator, and to determine a speed of the generator based on the DC-link voltage.

In a thyristor starter, an inverter converts DC power provided from a converter through a DC reactor into AC power having a variable frequency, and supplies the AC power to a synchronous machine. A controller controls the inverter based on a phase control angle. A voltage regulator regulates an induced voltage of the synchronous machine by supplying a field current to the synchronous machine. When a rotation speed of the synchronous machine exceeds a reference rotation speed during acceleration of the synchronous machine, the voltage regulator controls the field current such that the induced voltage increases with an increase in the rotation speed of the synchronous machine. The controller decreases a rate of increase in the phase control angle relative to the rotation speed of the synchronous machine, as compared with when the rotation speed of the synchronous machine is less than the reference rotation speed.

A method for operating a steam turbine, wherein the pressure of the cooling medium in the generator is changed not only for cooling but also for increasing or decreasing the torque of the generator on the steam turbine, this being utilized for the purpose of the start-up or shut-down process.

An electrical generator (114) and a power electronics interface (115) for a direct-drive turbine (110). The turbine (110) may include a rotor (112) for transforming kinetic (from, e.g., wind, water, steam) into mechanical energy, the generator (114) for transforming the mechanical into electrical energy, and the power electronics interface (115) for conditioning the electrical energy for delivery to a power distribution grid (124). The interface (115) includes a three-phase single-stage boost inverter (120) for converting a lower DC voltage into a higher AC voltage, and which uses a synchronous reactance of the generator (114) as a DC-link inductance. The turbine (110) has neither the gearbox of indirect-drive designs nor the electrolytic capacitor bank of conventional direct-drive designs, while still allowing for a substantially smaller number of generator poles, resulting in reduced size, weight, complexity, and cost.

The hyperbaric load control for a power plant is an energy storage device used to regulate the tangent velocity of a gas turbine. Specifically, the hyperbaric load control for a power plant: a) releases previously stored energy in the form of supplemental electrical energy to compensate for an energy deficit created by an operating condition where the electrical energy demanded by the electric load is greater than the energy provided by the gas turbine; and, b) absorbs and stores the excess energy created by an operating condition where the energy transferred to the electric generator from the gas turbine is greater than the electric energy demanded by the electric load. The hyperbaric load control for a power plant comprises an electric motor, a compressor, a high pressure gas tank, a supplemental turbine, a supplemental electric generator, and a control system.

The present invention provides a generalized frequency conversion system for a steam turbine generator unit. The system comprises at least a steam turbine (T) with an adjustable rotating speed, a water feeding pump (BFP), a generator (G), a speed increasing gearbox (GB), a variable frequency bus (a, c) and an auxiliary machine connected thereto. With a change in load of the unit, parameters of steam entering the steam turbine (T) and an extracted steam amount are correspondingly adjusted (changed), so that the rotating speed of the steam turbine (T) changes correspondingly; and thus the rotating speed of the water feeding pump (BFP) is changed through the speed increasing gearbox (GB) on the one hand, and the frequency of an alternating current outputted by the generator (G) is changed on the other hand. Other types of frequency converters do not need to be additionally provided. The system is simple, reliable, low in cost, and high in efficiency.

An electrical generator (114) and a power electronics interface (115) for a direct-drive turbine (110). The turbine (110) may include a rotor (112) for transforming kinetic (from, e.g., wind, water, steam) into mechanical energy, the generator (114) for transforming the mechanical into electrical energy, and the power electronics interface (115) for conditioning the electrical energy for delivery to a power distribution grid (124). The interface (115) includes a three-phase single-stage boost inverter (120) for converting a lower DC voltage into a higher AC voltage, and which uses a synchronous reactance of the generator (114) as a DC link inductance. The turbine (110) has neither the gearbox of indirect-drive designs nor the electrolytic capacitor bank of conventional direct-drive designs, while still allowing for a substantially smaller number of generator poles, resulting in reduced size, weight, complexity, and cost.

An electrical system for connecting a rotary electric machine to de networks operating at different voltages V and W where V>W, the electric machine has N=4 polyphase winding sets. The electrical system includes a first set of N=4 ac-dc converter circuits connected in a modular multilevel configuration, each ac-dc converter circuit having a respective index n=(1, . . . , 4) and an ac interface for connection with a corresponding nth winding set, and in which the modular multilevel configuration has P=5 dc outputs each having a respective index p=(1, . . . , 5), and a set of N=4 dc-dc converter circuits each having a respective index n=(1, . . . , 4) and being configured to convert dc power between a voltage V/4 at a first dc interface and a voltage W at a second dc interface.

A power system, which can appropriately control an output power of a power plant, includes a power plant, a power transmission flow limiter inserted between the power plant and a substation via transmission lines and, and a control system, wherein the control system outputs to the power transmission flow limiter a power transmission flow limitation signal CP indicating that an output power P of the power plant should be limited; and the power transmission flow limiter limits the output power P of the power plant, which is transmitted via the transmission lines and on the basis of the power transmission flow limitation signal CP.

A power system, which can appropriately control an output power of a power plant, includes a power plant, a power transmission flow limiter inserted between the power plant and a substation via transmission lines and, and a control system, wherein the control system outputs to the power transmission flow limiter a power transmission flow limitation signal CP indicating that an output power P of the power plant should be limited; and the power transmission flow limiter limits the output power P of the power plant, which is transmitted via the transmission lines and on the basis of the power transmission flow limitation signal CP.