UNS0119A-P,V101 3BHE029154P3 3BHE029153R0101 Frequency Control System

UNS0119A-P,V101 3BHE029154P3 3BHE029153R0101 has the characteristics of low application cost, high operational reliability but difficult programme design, and its internal successful embedding of the generator’s fault recording of the important operational parameters has a greater practical value, especially for the current development of a large number of small and medium-sized hydroelectric power plant hydro-generator sets, which is important to Ensuring the safe, stable and reliable operation of generator sets is of great significance.

UNS0119A-P,V101 3BHE029154P3 3BHE029153R0101 system frequency conversion speed regulation by the PLC and frequency converter to complete, the principle of which is shown in Figure 2. Place a pressure sensor in the water station at the water pipe, the transmitter is responsible for the sensor pressure signal is converted to 1 yao 5 V DC voltage signal sent to the PLC closed-loop control module, the signal and the pressure of the given value compared to the PID algorithm, the output from the module of a 4 yao 20 mA (can also be 0 yao 10 V) of the control signal sent to the frequency converter to control the frequency converter output frequency, to achieve the motor stepless speed regulation, to output water supply pipe water to the generator set. The output frequency of the frequency converter is controlled to achieve stepless speed regulation of the motor to stabilise the water pressure of the output water supply pipe at the set pressure.

UNS0119A-P,V101 3BHE029154P3 3BHE029153R0101 is the resistance characteristic curve of the water supply system when the valve is fully open, curve 2 is the head characteristic curve of the pump at rated speed, the working point of the water supply system is A, the flow rate is qa, and the head rate is ha, and the motor’s shaft power is proportional to the area O-qa-A-ha-O. To reduce the flow rate to qb of the main adjustment method has two kinds: the traditional method is to keep the motor (pump) speed is unchanged, the valve will be closed small, resistance characteristics as shown in curve 3, the working point moved to point B flow rate of qb, head for hb, the motor’s shaft power is proportional to the area Oqb-B-hb-O. The use of frequency conversion speed control is to keep the valve opening unchanged, reduce the speed of the motor (water pump)