# Which Power System Design Is Optimal for Mixed Frequency Plants?

• khamoshie
In summary, the conversation discusses the best solution for configuring power generation for a facility with three new plants, two of which operate at 50 hz and one at 60 hz. The options are to set up two generators, one for each frequency, or to use a single 50 hz generator and connect all motors in the 60 hz plant via VFDs. The main concern is the impact of using VFDs on the system's reliability and maintenance cost. The decision also depends on design constraints such as cost, MTBF for generators vs VFDs, and conversion efficiency.
khamoshie
I am currently working on a university assignment and am quite confused in the following design problem...

Assume that a new in a facility 3 new plants are being setup. 2 of these plants have all motors rated at 50 hz while the third one has all motors operating at 60 hz. the first two plants require electrical power of around 40 MW and the 60 hz plant requires 6 MW. Which would be a better solution for the configuration of power generation...

(1) Setting up two suitably rated generators one that generates output at 50 Hz for the 50 hz plant and the other one generates output @ 60hz for the other plant...

(2) Or Setting up a single generator of 50 Hz and all motors of the 60 hz plant to be connected via VFD's...

note :Standard LV voltage @ 50hz is 400V p-p
All motors in the 60 Hz plant (180 total) operating at 480V p-p ,60hz

My Understanding of this problem is that exactly what would be the impact of using so many VFD's in the Plant...

Any help would be highly Appreciated...

Looks like you need to work out the costs for each configuration.
Do you need VFD for each motor?
Can you use one for the entire plant?

Yes Cost may be a factor but the initial concern is the reliability of the system design...I mean using a single 50 hz generator will simplify the power generation system but at the same time it will also introduce more maintenance cost for the VFD's...

And if we do it the other way, this would simply mean that there would be a dedicated generator for the 60 hz system...no VFD's would be required but now the power generation will be at two different frequencies...

Simpy if we initially disregard the cost overheads what would be a better Engineering design...?

You have to chose your design constraints.
If not cost, then you get into MTBF for generators vs VFD
or conversin effiency.

## 1. What is a power system design problem?

A power system design problem refers to the challenge of creating an efficient and reliable system for generating, transmitting, and distributing electrical power to meet the demands of consumers. This includes designing components such as power plants, transformers, and transmission lines, as well as managing the overall system to ensure stability and minimize losses.

## 2. What are the key considerations in power system design?

Some key considerations in power system design include load demand, system reliability, cost-effectiveness, and environmental impact. Engineers must also take into account factors such as voltage regulation, frequency control, and power quality to ensure the system operates efficiently and safely.

## 3. How do you determine the optimal size and location of power plants in a power system design?

The optimal size and location of power plants in a power system design are determined by analyzing the load demand and the availability of resources such as fuel and land. Engineers also consider factors such as the distance between the power plant and the load center, transmission constraints, and environmental regulations.

## 4. How do you ensure the reliability of a power system?

To ensure the reliability of a power system, engineers use various techniques such as redundancy, diversity, and proper maintenance practices. Redundancy involves having backup systems in place to avoid failures, while diversity refers to using different types of equipment to minimize the impact of a single failure. Regular maintenance and monitoring also help to identify and address potential issues before they cause disruptions in the system.

## 5. How does renewable energy factor into power system design?

Renewable energy sources, such as solar and wind power, are becoming increasingly important in power system design due to their potential to reduce carbon emissions and dependence on fossil fuels. Engineers must consider factors such as intermittency and location when incorporating renewable energy into the design, as well as finding ways to integrate it with traditional power sources to maintain stability in the system.

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