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Suzhou Firstall Electrical Machine & Technology Co., Ltd. is a leading Supplier of professional-quality power alternators/generators, Brushless Synchronous AC Alternator , ac generator ,as well as professional service on international trade. FIRSTALL markets its products and service its partner around the world from the office located in Suzhou and Wuxi city Jiangsu province, China.
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Description of the ac generator system
Description of the ac generator system
This invention relates to an ac generator system and more particularly to a method and system for controlling connection of a supply of Ac to a load and to a power supply grid.
The Ac generator system disclosed in US2002/0030365 may transition from the power on-line state to the power off-line state. The power off-line state performs the functions of opening the contactor that connects the system to the grid, switching the main inverter of the system to a voltage mode (in contrast to the brushless alternator on-line state which enables the main inverter in a current mode) and setting the power level to a nominal level to power local loads. In the on-line state, the system samples the grid frequency and synchronizes its Ac output voltage with the voltage of the grid. When the line power unit is operating in a stand-alone mode or when the utility grid is not available (i.e. off-line) it is necessary for the system to synthesize a frequency so that the output power frequency is self-regulating.
During normal independent operation of the generator set described and illustrated in WO01/56133, the output AC voltage is controlled in accordance with one or more references which are generated by or within the generator set or as it is being set up for operation. Active and reactive power consumption is dependent on loads to which the Ac output of the generator set is connected.
An object of this brushless ac generator is to provide for improved connection and disconnection of the Ac output of an Ac generator system of the kind referred to hereinbefore to a power supply grid.
Connection and/or disconnection of the ac alternator of an Ac generator system of the kind referred to hereinbefore to a power supply grid needs to take account of the fact that the grid voltage may be out of phase and at a different frequency to the Ac output of the Ac generator system of the kind referred to hereinbefore when the latter is being operated independently.
Broadly in accordance with this invention the control of the Ac output of an Ac generator system of the kind referred to hereinbefore is disabled and the Ac output of the Ac generator system of the kind referred to hereinbefore is brought into harmony with the grid voltage, both in phase and frequency. By this invention, one or more references that are generated by or within the generator set or that were established as the generator set was being set up for operation and which determined the AC output voltage, are replaced by references derived from the grid data.
This invention relates to an ac generator system and more particularly to a method and system for controlling connection of a supply of Ac to a load and to a power supply grid.
The Ac generator system disclosed in US2002/0030365 may transition from the power on-line state to the power off-line state. The power off-line state performs the functions of opening the contactor that connects the system to the grid, switching the main inverter of the system to a voltage mode (in contrast to the brushless alternator on-line state which enables the main inverter in a current mode) and setting the power level to a nominal level to power local loads. In the on-line state, the system samples the grid frequency and synchronizes its Ac output voltage with the voltage of the grid. When the line power unit is operating in a stand-alone mode or when the utility grid is not available (i.e. off-line) it is necessary for the system to synthesize a frequency so that the output power frequency is self-regulating.
During normal independent operation of the generator set described and illustrated in WO01/56133, the output AC voltage is controlled in accordance with one or more references which are generated by or within the generator set or as it is being set up for operation. Active and reactive power consumption is dependent on loads to which the Ac output of the generator set is connected.
An object of this brushless ac generator is to provide for improved connection and disconnection of the Ac output of an Ac generator system of the kind referred to hereinbefore to a power supply grid.
Connection and/or disconnection of the ac alternator of an Ac generator system of the kind referred to hereinbefore to a power supply grid needs to take account of the fact that the grid voltage may be out of phase and at a different frequency to the Ac output of the Ac generator system of the kind referred to hereinbefore when the latter is being operated independently.
Broadly in accordance with this invention the control of the Ac output of an Ac generator system of the kind referred to hereinbefore is disabled and the Ac output of the Ac generator system of the kind referred to hereinbefore is brought into harmony with the grid voltage, both in phase and frequency. By this invention, one or more references that are generated by or within the generator set or that were established as the generator set was being set up for operation and which determined the AC output voltage, are replaced by references derived from the grid data.