How to run multiple generator sets in parallel?

how toGenerator setWhat about paralleling? What are the requirements and conditions for parallel operation? What are the advantages and disadvantages of parallel units? Haixing Power Technology analyzes parallel machine technology for our customers! Usually the generator sets are paralleled, that is, twoGenerator setThrough the organic combination of a parallel system, the theoretical power generation power can be increased. Two units running in parallel to generate electricity must meet three conditions: the same voltage, the same frequency, and the same initial phase. Theoretically, units of different types can operate in parallel to generate electricity as long as they have electronic speed control systems.

1. Requirements and conditions for parallel operation
Electronic speed control generator set; same phase sequence; equal voltage; same frequency; same phase. Automatic parallel screen: a practical automation system. It has all the functions of manual parallel screen. When the switch selector is placed in the 'auto' position, the automatic synchronizer can automatically adjust the frequency and phase of the unit to be paralleled, and output a closing signal during synchronization to achieve automatic paralleling. The built-in programmable controller can automatically control load balancing, load demand and unit operation scheduling to ensure reliable operation of the power grid. When the mains fails, the generator set can be automatically started, automatically connected in parallel, and various faults of the parallel system can be monitored.
2. Parallel cabinet configuration
1. The cabinet body is generally of international electrical standard cabinet size, and can also be processed according to user requirements.
2. Number of incoming cabinets: 1 unit/unit. 3. All indicating instruments, all control relays, transfer switches, and potentiometers on the cabinet are imported or domestic products, and the protection level of the cabinet meets the IP22 standard.
4. Parallel control module: electronic speed regulation module, synchronization module, load distribution module, interface card, etc.
5. Parameter display: current, voltage, frequency, power, power factor table
6. Circuit breaker: configure a quick closing air circuit breaker of appropriate specifications according to user requirements.
3. Advantages of parallel machines and parallel cabinets
We at Haixing Power Company believe that fully automatic generator set paralleling (paralleling) is equipped with synchronous control, load distribution module and automatic opening and closing switch. The entire parallel cabinet device has the characteristics of advanced performance, easy use and maintenance. For the situation where multiple generator sets supply power to the load at the same time, in order to ensure the reliability of the power grid, parallel cabinets must be equipped for economy.
Parallel cabinets have the following advantages:
1. Improve the reliability and continuity of the power supply system. Because multiple units are connected in parallel to form a power grid, the voltage and frequency of the power supply are stable and can withstand the impact of large load changes.
2. Maintenance and maintenance are more convenient. Multiple units can be used in parallel and can be centrally dispatched to distribute active and reactive loads, making maintenance and repairs convenient and timely.
3. More economical. According to the size of the online load, an appropriate number of low-power units can be invested to reduce the waste of fuel and oil caused by the small-load operation of high-power units.
4. Future expansion is more flexible. You only need to install the power generation and parallel equipment with the current required power. When the company needs to expand the power grid capacity in the future, it can add diesel generator sets, and the parallel operation of the expanded units can be easily realized, making the initial investment more efficient. Showing economy.
4. The main features of parallel operation of multiple generator sets:
1. Manual/fully automatic parallel mode selection.
2. Synchronous paralleling is accurate, without impact, and the paralleling time is short (no more than 3 seconds).
3. The units to be paralleled can be automatically paralleled or decoupled according to load requirements, making operation more economical.
4. When multiple units operate in parallel, the load distribution difference is less than 5%, ensuring the reliability of unit operation.
5. Cooperating with the unit's self-starting control module, it can realize automatic start-up and input when the mains power fails, automatic paralleling; automatic decoupling and shutdown after the mains power is restored.
6. It has reverse power, overcurrent, short circuit, mechanical failure, and mains float charger failure indication and protection functions.
7. It can be used in conjunction with the ATS cabinet. When the mains power comes, the unit automatically cuts off the delay and the load is transferred to the mains side; when the mains fails, the unit starts automatically and the load is transferred to the generator side. In this conversion, mains power always takes priority.
5. Summary
To sum up, we at Haixing Power Company believe that the advantages of paralleling multiple diesel generator sets are: the control system is economical, simple, flexible, convenient and reliable, and can meet the user's dynamic load requirements and needs.