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Intelligent parallel control system for diesel generator set


Detailed Description:

Second, the parallel advantages of Rixing Power Technology diesel generators

The Rixing Power series parallel cabinet control system has the necessary functions for parallel operation, including automatic load distribution, automatic parallel connection, soft unloading, soft loading, zero power switching, easy maintenance modular combination, necessary fault protection display, LCD power display and microcomputer processor. In Rixing Power series parallel cabinet control system, the load can be used for active power and reactive power distribution. The circuit and control system are simple, providing a stable and reliable parallel-connected grid-connected parallel system. The operator is easy to operate and control, and the display can provide the necessary Chinese / English display data for all the crew.

2.1 Control Core Controller Module for Parallel Grid-connected Parallel System

Parallel and grid-connected parallel controller

The controller is the heart of the parallel and grid-connected parallel system. It is responsible for data processing and control of various protection and device actions and data display. The processor is designed to provide perfect system management for diesel generator sets. The functions of the controller include:

Ø Engine warm up

Ø Throttle solenoid valve control

Ø Engine start control

Ø Ø Cool time timer for power control

 Ø Oil pressure monitoring

 Ø Water temperature monitoring

 Ø Battery voltage monitoring

 Ø Speed monitoring

2.2 Active load control

Quickly calculate the rms value of power and provide accurate load control

User can enter and exit each operation mode

Load sharing of units (up to 32) in parallel according to the percentage of load (allowing units with different rated powers to proportionally balance active power loads)

 Ø In order to maintain the best fuel consumption rate, the continuously running unit can be controlled by remotely changing the unit load

 Ø Smooth and effective switching function (equipped with switching screen)

2.3 Reactive load control

Ø Proportional reactive power distribution (allowing units with different rated power to proactively distribute reactive power) The system is simple, and slope transformers and voltage regulators are used to control reactive power and distribute it evenly.

Ø Automatic generator start and stop sequence (in automatic mode)

When the load exceeds the set value, the unit will automatically start to work in parallel

When the load is lower than the set value, control the unloading and shutdown of the unit

The above functions can be modified according to customer requirements

2.4 Protection of generators

Ø Over voltage / low voltage

Ø Over frequency / low frequency

Ø Reverse power protection

 Excitation failure

Ø Over current

Ø Speed / frequency mismatch

Ø Overload / low load

2.5 Protection of the engine

 Water temperature is too high / low

 Oil pressure is too high / low

ØØ Speeding

Failure to start

2.6 Electric air switch

The generator parallel circuit breaker used in the parallel and grid-connected parallel system is an electric parallel circuit breaker to reduce the time error caused by manual operation and the normal operation of the system. When syncing,

The controller ensures that the unit voltage, phase, and frequency are within the allowable error range, and then provides the closing signal to the parallel circuit breaker to close, which improves the operation reliability and safety.

2.7 Speed control system

It is used for active power distribution of parallel and parallel units. The speed of the unit is obtained according to the speed sensor (MPU), and the speed signal is transmitted to the parallel and grid-connected parallel controller. The controller sends a control signal to the corresponding port after comparison and calculation. The load distribution module converts the standard non-fixed control signal into a standard fixed control signal to the electronic control system, and the controller controls the electronic governor according to the control signal, so as to achieve the purpose of accurately controlling the throttle. This solves the problems of safety, reliability and accuracy of throttle adjustment in load distribution.

2.8 Slope Transformer (Droop CT) and Automatic Voltage Regulator (AVR)

In the parallel and grid-connected parallel system, the reactive power load distribution and voltage stabilization of the generator are adjusted by the automatic voltage regulator (AVR) and the slope transformer. The automatic voltage regulator controls the output current of the generator by changing the magnitude of the exciting current, so as to change the output power of the alternator.

3. Communication of Rixing Power Parallel System

The communication of Rixing Power Parallel System is composed of two parts: the communication between the unit and the communication between the unit computer (PC).

3.1 Inter-unit communication

Various functions such as start-stop sequence, load distribution, switch closing time, etc. among the units in the parallel system are communicated through the data of each parallel-connected grid-connected parallel controller, and then the controller processes the data and issues the corresponding Control commands to achieve parallel control of each unit. The communication adopts RS-485 network, and its connection diagram in the parallel and parallel connection controller is as follows:

3.2 Communication between the unit and the PC:

The running status of the parallel unit can be remotely monitored by a PC, and the communication between the parallel unit and the PC uses a Modbus RS485 network. Modbus communication protocol is public; RS-485 network uses RS-485 communication protocol connection line, transmission speed is 9600 baud rate, no parity, there is a stop bit, full duplex / half duplex communication can be used; computer A converter is required between the RS-232 communication protocol used by the port and the RS-485 communication protocol used by the network port formed by the E-Gen3000 controller. The conversion is completed by an external conversion module. This module converts the 9-pin RS-232 protocol input from the computer into the controller's RS-485 protocol, which is called an RS-232 to RS-485 converter. The connection diagram in the controller is as follows:

3.3 The schematic diagram is as follows:

Note: ① electronic governor, AVR ② phase, phase sequence, voltage, frequency ③ switch close signal

Fourth, the standard configuration of parallel and grid-connected parallel controller:

4.1 Generator parameter display (LCD display)

ØAC line voltage and phase voltage (3 phase)

ØAC current (3 phases neutralize each group)

Ø Frequency

Ø kWh-total power generation

Ø Power-total power and active power per phase

Ø Reactive power-total reactive power and reactive power per phase

Ø Power factor

Ø Phase difference between bus and generator (%)

Ø Cumulative running time

Ø Cooling water temperature

Ø DC voltage

4.2 Bus parameter display

 AC voltage (phase)

 AC voltage / frequency

4.3 Operational control

 Stop / Auto / Manual Control

ØEmergency stop lock button

ØØ Touch type membrane button

ØØ AC voltage adjustment-manual and automatic

ØDiesel engine speed adjustment—manual and automatic

4.4 System control

Ø 3 trial start counters

Ø Cooling delay

Ø Preheat delay

Ø Remote start performance

Ø Parallel detection relay

Ø Reverse power protection relay

Ø Manual parallel

Ø Automatic parallel

Ø Automatic load distribution control

Ø Automatic loading and unloading control

Ø Load order control

4.5 Stops and alarms

Ø High water temperature shutdown

Ø Low oil pressure shutdown

Ø Overspeed shutdown

Ø Failure to start and stop

Ø Emergency stop operation

Ø Reverse power shutdown

Ø Over-voltage shutdown

Ø Low voltage shutdown or alarm

Ø High frequency shutdown

Ø Low frequency shutdown or alarm

Ø Alarm for car failure

Ø Low battery alarm

Ø High battery voltage alarm

Ø Generator loss of field alarm

Ø Standby fault setting input ports (up to 32)-Low water temperature fault-Ground fault-Low oil level shutdown or alarm-Low cooling water level shutdown

4.6 Status indicator

Ø Master switch status indicator

Ø Fault record memory

Five, diesel generator set parallel scheme description

5.1 Description of Parallel Control Cabinet

This set of parallel control cabinets are three Cummins 500KW + 400KW + 220KW unit parallel control cabinets, including three floor-mounted control cabinets and one outlet cabinet, which integrates the start-up control and parallel control of a single generator set. Each unit has sufficient control functions and independent operating capabilities. Even if one unit fails, the other unit can still operate autonomously.

The Rixing Power series parallel control system is used to control the diesel generator set. It has the advantages of intuitive operation interface, flexible control logic and expandable input and output ports. It provides customers with a highly efficient diesel generator set platform, allowing customers to control diesel Enjoy the most advanced industrial control technology achievements when generating units.

This parallel control cabinet is two 400KW + 400KW parallel control cabinets from Perkins Weiss EFI units, including a floor-mounted control cabinet, which integrates the start-up control and parallel control of a single generator set. Each unit has sufficient control functions and independent operating capabilities. Even if one unit fails, the other unit can still operate autonomously.

The Rixing Power series parallel control system is used to control the diesel generator set. It has the advantages of intuitive operation interface, flexible control logic and expandable input and output ports. It provides customers with a highly efficient diesel generator set platform, allowing customers to control diesel Enjoy the most advanced industrial control technology achievements when generating units.

6. Description of control system for parallel control cabinet

This parallel control cabinet is a main and a backup control screen. When all the mains power fails, both units start up. Any one of the units runs normally first, and then the exit circuit breaker is closed first. This unit first supplies power to the main unit. Row, the system sends a first-level load signal, and the other unit automatically tracks and closes its exit circuit breaker after synchronization. The two units run in parallel while the system loads, and the system sends a second-level load signal, and the user can sequentially load according to the load level. . The two units run in parallel for 10 minutes (can be adjusted according to user needs). The load management system of the parallel control screen is based on the load preset value of the start-stop group. When the load of a single unit is less than 35% of the rated capacity of the single unit (It can be adjusted according to user needs), and the duration exceeds 1 minute (can be adjusted according to user needs), the standby unit automatically cools down and exits the parallel system, and the main unit has a load section load. When the system load increases, and the load of a single unit exceeds 70% of the rated capacity of the single unit (can be adjusted according to user needs), the parallel control system automatically starts the standby unit, automatically tracks synchronization, and the standby unit is put into the parallel system again. The two units are in parallel and under load. The unit's parallel control system waits for the next load increase or decrease action and performs corresponding start-stop control.

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