Patent ID: 8497599

Claim:
An electrical generator network comprising a plurality of electrical generators and a plurality of local electrical systems, each local electrical system having an electrical generator, at least one of the local electrical systems having a controller to avoid the non-detection zone of loss-of-mains relays, the controller being arranged to monitor the real power flow from the electrical generator network to the at least one of the local electrical systems, the controller being arranged to determine if the absolute value of the real power flow from the electrical generator network to the at least one of the local electrical systems is below a first predetermined value to determine if there is a close match between the power requirements of the at least one of the local electrical system and the respective electrical generator, if the controller determines that the absolute value of the real power flow from the electrical generator network to the at least one of the local electrical systems is below the first predetermined value then the controller is arranged to monitor the reactive power flow from the electrical generator network to the at least one of the local electrical systems, the controller being arranged to determine if the absolute value of the reactive power flow from the electrical generator network to the at least one of the local electrical systems is below a second predetermined value to determine if there is a close match between the real and reactive power requirements of the local electrical systems and the real and reactive power produced by the respective electrical generator, if the controller determines that the absolute value of the reactive power flow from the electrical generator network to the at least one of the local electrical systems is below the second predetermined value then the controller is arranged to adjust the target reactive power output from the electrical generator of the at least one of the local electrical systems such that the reactive power flow from the electrical generator networks to the at least one of the local electrical systems has an absolute value of plus or minus the second predetermined value.