A new microprocessor-based identifier for parameter identification of synchronous machines

For convenience to measure and automatically identify the synchronous machine parameters, a new microprocessor-based parameter identifier of synchronous machines is developed and described in this paper. The hardware of this identifier consists of three parts: signal metering part, identification part and output printer/liquid crystal display. Park's two axis model and random search algorithm are input to a 8098-microprocessor as the second part which is linked to a printer for results output. Either the DC decay test, or the low voltage AC standstill test presented in this paper may be used. When signals are measured and input to the identifier, the identification system automatically gives out all Park's parameters at the d/q axis. Field tests have been carried out for generators rated at (50-300) MVA at Baishan Hydro-Power Station and for some machines at other power stations in China. Results show that the identifier can effectively and quickly identify all Park's parameters of large synchronous machines.