NOVELTY - The power plant e.g. solar farm (10) has several power converters (24,34,38) electrically coupled to, and configured to receive power from the power sources (20,32,36). A voltage regulation device (70) is electrically coupled between the power converters and an electrical grid (62). The voltage regulation device is provided with a series transformer (76) and a bi-directional converter (78) that is configured to regulate a voltage at an output of the power converters.    USE - Power plant such as solar farm and wind farm for providing power to customer over electrical grid.    ADVANTAGE - The intra-plant AC distribution voltage can be regulated to follow the minimum voltage needs of power source for solar panel. The power plant is included with several power converters and the voltage regulation device, so that an intra-plant alternating current (AC) voltage level can be controlled efficiently. The efficiency of power plant can be increased by reducing inverter and/or distribution equipment losses. The cost of the power generation system can be reduced. The distribution equipment and inverters can be optimized for a narrower operating parameter range. The plant distribution losses and inverter losses can be reduced, while enabling operation of solar farm through a wide grid voltage tolerance band. The stability of operation of the power plant can be improved efficiently, while providing power to a weak grid. Use of cooling device to cool the converter/inverter can be eliminated or reduced due to more efficient inverter operation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method for controlling voltage regulation device included within power plant; and    (2) a voltage regulation device coupled to, and configured to provide power to an electrical grid.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the power plant with voltage regulation device.    Solar farm (10)    Power sources (20,32,36)    Power converters (24,34,38)    Electrical grid (62)    Voltage regulation device (70)    Series transformer (76)    Bi-directional converter (78)