IS200EROCH1ADD
IS200EROCH1ADD
IS200EROCH1ADD
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 ensure that only one unit of DCS to achieve the control of the common part, while another unit of DCS can achieve real-time monitoring, And this operation control can be switched.
(4) The interlocking logic of the electrical system is simple, but the operating mechanism of the electrical equipment itself is complex.
Therefore, the electrical system of the unit into DCS control, control system has high
