Local maintenance controller for gas turbine power plants having a primary control system

摘要

A local maintenance controller permits continued power generation during maintenance or failure of a primary gas turbine control system by manually for maintenance purposes or automatically for failure purposes assuming turbine control to thereby insure continued operation. The local maintenance controller set forth is particularly suitable for use in conjunction with a computer implemented gas turbine control system. P PTransfer between the local maintenance controller and the primary control system is effected in a bumpless manner so that load swings are absent. However, if the turbine was operating at system reserve at the time of transfer, the local maintenance controller reduces the load to peak value until primary control is resumed. Operation at any other load at the time of transfer is maintained by the controller. Transfer back to primary control is also effected in a bumpless manner. PP Pushbuttons provided on the controller and associated circuitry permit an operator to change loads as necessary within the limits of a peak performance curve. In addition, the turbine can be started, synchronized and loaded as necessary by the operator.