IS200VRTDH1D
IS200VRTDH1D
IS200VRTDH1D
DCS.” According to this spirit, the electrical system of Jiujiang Power plant Phase III 2×350MW, Xinyang Power plant Phase I 2×300MW, Yiyang Power Plant Phase I 2×300MW project are included in DCS monitoring. Now according to these several projects in the specific implementation of the process and requirements, the electrical system into DCS monitoring of some of the related problems are analyzed and discussed.
1. Characteristics of electrical system control
Electrical system and thermal automation in the control requirements and operation process has many differences, the main characteristics of electrical performance:
(1) Compared with thermal equipment, electrical equipment has fewer control objects and low frequency of operation. When some systems or equipment are in normal operation, they are often operated once for several months or longer.
(2) The electrical equipment protection automatic device requires high reliability and fast operation speed. The protection speed of the development group should be within 40ms. Automatic quasi-synchronous voltage mode, speed, voltage adjustment and sliding pressure control requirements within 5ms; Voltage automatic adjustment device fast excitation requires a very short time; The quick switching time of quick cutting device is generally less than 60 ~ 80ms, and the phase difference of synchronous identification is 5° ~ 20°.
(3) 300MW and above units in general every 2 units share 1 set of start/standby change, any unit maintenance can not affect the normal operation of another unit, so DCS control should consider its control mode, to
