Gas Engine Power Plant for Domestic Plant
A large domestic plant installed five gas engine units with the aim of reducing the amount of power it was supplied. The total generating capacity of just over 25 MW with a set of five units was a large size for a gas engine-based generating facility. This was the first Mitsubishi Power customer to introduce almost fully automated control over the number of generators.
Background to Introduction and Challenges Faced
TThe customer installed five gas engines with the aim of reducing the amount of power it was supplied.
However, as the on-site power load was subject to instantaneous and sharp fluctuations, it was necessary to maintain a balance between electricity demand and supply in every 30-minute period (constant control of received power). In addition, as the plant load changed significantly based on various factors such as time of day, lunch breaks and plant break periods, it was necessary to control the number of engines online in small increments, requiring detailed engine control.
Effects of Introduction
DIASYS Netmation was introduced and control logic was created with the IDOL ++ control language. Almost fully-automated control over the number of generators was achieved, allowing the system to track rapid load variations with little to no intervention by the operator. Through this control over the number of generators, a single operator console is employed despite there being five generators.
Each engine is controlled using a single process station (multiple process station, or MPS). By adopting a remote I/O module housed in the panel of the engine compartment as the I/O module, the amount of wiring was minimized and costs were also reduced.
A single shared MPS unit is used to control the number of generators.
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