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What is the Generator Auto Synchronizing Parallel System?
1. Two or more generators are electrically coupled together using special equipment to form a larger capacity power source.
2. Paralleling is the synchronous operation of two or more generator sets connected together on a common bus in order to provide power to common loads as shown in figure.
In deciding whether a single or multiple generators should be installed there are various factors to be considered, such as:
※ Load variation
※ Generator room sizes
※ Load types
Parallel Operation of Generators
The easiest way to setup a parallel system is to use generators that are exactly alike, or at least have the same output rating and alternator pitch. Another flexible approach to backing up your power requirements is to have two or more generators of variable output. In either scenario, these can be connected in parallel with paralleling switchgear to achieve maximum output during peak requirement or the desired minimal output during other times.
Benefits of parallel power generation systems
Parallel standby power systems have always been significantly advantageous over single large generator units. However, implementation of such systems has historically been limited to large projects or mission critical applications due to the constraints of higher cost, space, and the high level of complexity involved to setup and maintain.
The redundancy inherent in parallel operation of multiple generators provides greater reliability than is offered by single generator unit for critical loads. If one unit fails, the critical loads are redistributed among other units in the system on a priority basis.
When sizing generators to match you load requirements, it is often difficult to accurately project increases in load and adequately plan for anticipated additional requirements. If load projections are aggressive, your initial investment in a generator may be higher than necessary. On the other hand, if load projections are inadequate, you may be left without reliable standby power or may have to resort to expensive generator upgrades, or even purchasing another unit altogether.
By operating systems in parallel, it is easier to allow for variations in load without overrunning your budget or piling up expensive units that rarely get used. As long as you have enough physical space, generators can be added for additional power supply when required. Similarly, redundant generators can be detached from the unit and can be used separately at other sites.
Using multiple units in parallel offers greater flexibility than using a single large-sized generator of a high capacity. Multiple smaller generators operating in parallel do not need to be grouped together and can be located in a distributed fashion lessening the need for one very large footprint for a single, larger generator. Rooftop installations or setting up small-sized generators in limited areas are just a few ways you can creatively find ways to make them fit. Since the units do not require a collective large space that have to be side by side, these can often be installed in small facilities or whenever space is a restricting factor.
4. Easy of maintenance and serviceability
If a generator in the system breaks down or requires maintenance, individual units can be dismantled and serviced without disrupting the functioning of other units. The redundancy inherent in a parallel system provides multiple layers of protection and ensures an uninterrupted supply of power for critical circuits.
5. Cost-effectiveness and Quality Performance
Individual units operating in parallel are typically of smaller capacities. The engines used in these generators are usually industrial, on-road or high-volume engines designed with advanced manufacturing technology that gives them a high degree of reliability and low cost of generation per unit of power.
Key Considerations in Setting up Parallel Systems when you going to install Automatic Synchronizing Parallel System.
Load Balance: The load shared by each generator determines the speed of its engine. In a parallel system, the entire load is shared by all generators.
Synchronization: It is of course essential to synchronize the phase of each generator to that of the overall system. Automatic synchronizing equipment can also be utilized in many situations.
Speed Control: Each individual generator operates at its own specified engine speed and frequency. When individual generators are coupled together, their engine speeds are locked into the overall speed of the entire system.
Voltage Regulation: As in the case of engine speeds of individual generators, the voltage of each unit is locked into that of other units in the system. When any unit has a slightly higher voltage set point than other generators in the system, it will end up bearing the entire voltage load of the system. Voltage regulators of individual generators are interconnected in a reactive cross current system, which regulates the voltage set points of individual generators by collecting input from all the transformers controlling individual voltages.
Genset Controller: A controller is installed for checking the parameters of the engine and the alternators of each unit in the system. Load control and scheduling generators to go on/off can also be done with some of the newer digital controllers available.
Relay: A proactive relay controller checks for proper synchronization, load and voltage balance and reverse power functions.
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