Diesel generator set automatic control system of classification and grading

Diesel generator set white motion control system can be divided into the following four categories:

(1) the first kind of control mode is relay and semiconductor device logic control, simple and effective work.Its disadvantage is that the components, complex circuit, big volume and poor reliability.If need to increase function, need to modify the control circuit.

(2) the second type of control method using a program controller is used to replace logic circuits, semiconductor devices in the first way to standardize the hardware, use special-purpose language makes programming easier;Using software change control circuit, it is very convenient.With large scale integrated circuit reduce number of components and software has self-checking function, improve the reliability.

(3) the third type of control mode is to use micro computer to replace manual operation management, formed the program controller, standardization of analog controller and the combination of the microcomputer.The start-stop, parallel solution column and the load distribution, etc. As independent units connected to the microcomputer, using software to implement the whole process of automatic control, operation more convenient.But need to backup measures, avoid cause out of control in computer failure occurs.

(4) the fourth kind of control method is to use a microcomputer or programmable logic controller (PLC) to realize the diesel generator set power station automation control.Hardware composition is simple, but reliable backup measures must be considered.This way, make full use of computer technology, make ordinary units change for automation units.It can realize control, also can undertake data processing and scientific computing, and its not satisfy completely the requirements of control operation speed and precision.Its outstanding advantage is that the 3 control program stored in memory, the connection is limited to detect connected devices, actuators, simplifies hardware and wiring, and thus its high reliability and wide adaptability, convenient debugging and maintenance.Therefore, the fourth kind of control mode is the development direction of diesel generating sets automation control system.

Automatic generating set development and production in China began in the 1960 s, the unit is the first and the second kind of control mode matching production variety is more, the main application field is a communication system and shipping industry.With the development of computer technology, especially the microprocessor based programmable controller (PLC) application and development of the rapid emergence makes the fourth kind of automatic generating set.Programmable controller (PLC) is a comprehensive computer, control, communication and CRT display technology and developed, can be combined as needed, to adapt to the need of different level and scale of automatic control device.In particular, it is better than the microcomputer can be used in harsh industrial environments, so, PLC has been widely used for various automation control field.

Diesel generator set white dynamic control system of grading

Diesel generator set automation control system designer or user, we should departure from the actual situation, according to the requirement of specific diesel generating set must have automatic control function.Our country to the rated power is not more than 3200 kw stationary automatic diesel generator set (GB/T4712-1996 "white move diesel generating set hierarchical requirements" standard, the diesel generator set according to the degree of its white move into level 3;

(1) the level of white to move, the performance of the diesel generating set is as follows:

1) a single generator automation for emergency power supply.Maintain a constant voltage and frequency during the run.

2) generator set should be run automatically maintain emergency standby state (battery charged automatically; air cylinder automatic inflatable), diesel engine prelubricated before the start of the white to move.

3) when the generator set to start, run or stop, realization of automatic control instruction will be effected according to the white start, run or stopMachine.

4) generator set in the process of running, if appear overload, short circuit, speed, high frequency, water temperature, oil pressure too low anomalies, can automatic protection.

5) generator set should match the normal running shows that the sound and light signal system, through these instructions signal and alarm signals show that operation of the unit.

6) generators in the case of unattended should be able to run continuously for 4 h.

(2) secondary automatic diesel generating sets besides satisfying the requirements level automation unit, also should have the following features:

1) generating units should have the function of the automatic fuel, oil and cooling water supplement.

2) generators in the case of unattended, can run continuously 240 h.

(3) three-level automatic diesel generating set in addition to satisfying the requirements of a, level 2 automation units, also must have the following features:

1) when the generator set since the launch failure, since the launch control program system, should be able to white move will start the transfer instruction to a backup unit.

2) according to automatic generating set should be able to control instructions or remote control to complete two same specifications of the generator automatically tied for reconciliation.

3) generator set in parallel, should be able to automatically allocate the output of active power and reactive power.

4) generator set white besides having first and second level the unit outside the protection, could also should have the function of reverse power protection, etc.

Three tertiary white dynamic generating set three can be composed of a power plant automation.The two commonly used power supply unit. A backup, so should add functions related to the parallel operation.Automation control system should be based on load and run please condition, three sets of generating set automatic sequence start-stop, parallel, columns and load distribution.Fault is divided into two levels: level 1 for light failure, should realize uninterrupted power supply, namely put standby generator in parallel operation, to stop the defective generator set.Secondary major fault, emergency stop the defective generating set at the same time, immediately put into standby generator set, to allow the interruption of power supply to load.