| With the development of cybernetics and micro-electron technique . the technique of computer control has been popularized and applied gradually in hydro-power plants, good effect is gained and a plenty of experience is accumulated, the level of automation has been boosted greatly in hydro-power plants, a lot types of excitation regulators based on microprocessor appear in excitation control of the generator. However, the microprocessor excitation regulators applied in power plants replace the general integration circuit only in closed loop control mostly. Its reliability, communication ability and interface can't meet the need of hydro-power plants.This paper researches and develops a type of double-channel PCC excitation regulator based on previous PCC excitation regulator applied in power plant. First, the whole structure and the working principle of the excitation system are introduced briefly. Second, the specific design and realization ways of regulator's software and hardware based on CP476 are suggested. Lastly, the analysis and design of set's reliability is conducted.In forming of pulse, it utilizes TPU function block of PCC without any hardware appended, which has characteristics of simple construction, high credibility and strict symmetry; In the parts of double-channel switch and double-bridge use CMOS IC, which can improve fleetness and coefficient of commute; In communication, the use of the CAN serial communications interface of CP476 composes high reliability field bus communications in order to ensure the reality of system's supervision and control reliably. In interface, the replacement of general keys with touch screen makes it convenient to set parameter, direct to operate and easy to maintain.The developed device is tested on generator in laboratory. The test result indicates that: the designed hardware and software possess better flexibility, the whole performance reach or precede state standard and the device can be applied in industry production. |
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