(JP9019193-A)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (JP9023651-A)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (WO9716627-A1)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (FR2741116-A1)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (US5742515-A)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (FR2755319-A1)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (FR2755547-A1)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.    (CN1166867-A)      A hydroelectric power generation system (20) feeds electrical utility system (72). A controller (42) obtains signal from water head transducer (25) and requested electrical output power from hydro-turbine (70) to regulate the speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit, and to control its gate position.    The controller may access an updated memory or may include a real-time automatic governor which uses the utilisation system frequency to control the converter output.    ADVANTAGE -   Facilitates the practical application of a variable speed hydro-turbine to deliver controlled power levels to a utilisation system via a rotary asynchronous converter.