Design of Parallel Diesel Generator System

The design of 30 - 3000KW diesel generators mainly includes several aspects: the design principles of the cooling system, the base, the environmental protection equipment for diesel generator sets, the paralleling system of diesel generators, and the flexible and reliable automatic transfer system.

Today, the editor will focus on introducing the design principles of the diesel generator paralleling system and the precautions for installation.

1. Design Principles of Diesel Generator Paralleling System

The optimized design of the generator set paralleling system adopts a paralleling scheme composed of a paralleling - type monitoring system with load - sharing function and a paralleling cabinet, which can be better applied to large - scale paralleling systems. For different requirements, such as the start - up of high - power generators, the system can provide a pre - start function to meet the needs. To deal with the interference of strong electricity, weak electricity, and electromagnetism in the paralleling system, software filters and hardware filters are used in the design. The CAN bus method is used for digital quantity comparison to achieve more effective active power distribution, avoiding the adverse effects of voltage loss of the voltage - comparison load distributor on active power distribution. Different forms of reactive power distribution are designed according to different generator types. For generators using AVR voltage - regulating modules, the reactive power distribution uses software programming to add voltage feedback to offset the adverse effects of temperature drift. To avoid impacts on the generator sets, a zero - power conversion design scheme is provided in the paralleling system. That is, the generator sets are automatically synchronized and paralleled. The newly added generator set operates at zero power, and then the load is smoothly transferred and evenly distributed according to the settings.

The generator should meet the following installation conditions: concrete foundation, air intake louvers, air outlet louvers, exhaust ports, exhaust silencers, and installation positions for shock - proof and expansion exhaust pipes. Auxiliary equipment such as the generator's fuel tank, battery, control panel, and power distribution cabinet should be installed near the generator equipment.

2. Precautions for Diesel Generator Installation

(1) Generator sets are all equipped with a base, and shock - absorbing measures are generally taken on the base. The base should be installed on a concrete foundation.

(2) When the foundation is made of concrete, a spirit level should be used to measure its levelness during installation to ensure that the generator set is fixed on a level foundation. There should be special shock - absorbing pads or anchor bolts between the generator set and the foundation.

(3) The installation location should be well - ventilated. There should be sufficient air inlets at the motor end and good air outlets at the diesel engine end. The area of the air outlet should be more than 1.5 times the area of the water tank (radiator).

(4) The surrounding area of the installation site should be kept clean. Avoid placing items that can produce acidic, alkaline, or other corrosive gases and vapors nearby.

(5) The generator set shell must have a reliable protective grounding. For generators that require direct grounding of the neutral point, professional personnel must carry out the neutral - point grounding and be equipped with lightning protection devices. It is strictly prohibited to use the grounding device of the utility power for direct grounding of the neutral point.

(6) An ATS should be installed for the switching between the generator and the utility power to prevent reverse power transmission.

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