Feeding electricity to the grid and generator loads

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Discussion Overview

The discussion revolves around the mechanics of feeding electricity from a biomass generator back to the grid, particularly in the context of feed-in tariff initiatives. Participants explore the variability of loads drawn from generators and the requirements for grid connection.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about whether the grid draws variable loads from a generator similar to how a machine motor initially draws more power before stabilizing.
  • Another participant suggests that small generators can feed the grid at will, implying flexibility in generation compared to larger suppliers.
  • It is noted that large suppliers may need to curtail generation when the grid cannot absorb the electricity, indicating a potential limitation for larger operations.
  • A participant emphasizes the importance of safety, power quality, grid stability, and revenue in the requirements set by utilities for grid connection.
  • There is a mention that a generator can be configured to provide various levels of power to the grid, but this is contingent on the generator's operational limits.

Areas of Agreement / Disagreement

Participants express differing views on the flexibility of small versus large generators in feeding the grid, and there is no consensus on the specifics of how variable loads are managed in practice.

Contextual Notes

Limitations include potential missing assumptions about the operational characteristics of generators and the specific requirements imposed by utilities, which may vary by region and type of generator.

mellotango
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Hi,

I am in processing of sizing a generator that biomass as fuel to be fed back to the grid as part of feed in tariff initiatives. However, I would like to know roughly how this feeding mechanism works. For example, in a workshop, a machine motor would initially draw up to 5X the rated motor power output from a generator and gradually decrease to its rated power once it gains enough momentum. I want to know if when I'm feeding electricity to the grid from my generator, does the grid draw variable loads from my generator in a similar fashion? Or is the electricity supply to the grid at a constant predictable load?
 
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You'll have to contact engineers at the supplier to get a feel for how you can feed the grid. Very large suppliers will have to be willing to curtail generation when the grid cannot absorb the electricity. Small generators will be able to feed the grid at will and let major the supplier take any swings with their non-baseload generators.
 
turbo said:
Small generators will be able to feed the grid at will and let major the supplier take any swings with their non-baseload generators.

Yes, Most power generation companies provide huge amounts of energy and small fluctuations are moot; compared to smelting operations. Check out these conductors.

309px-TVA_phosphate_smelting_furnace.jpg
 
For Grid Tie - there are a lot of requirements form the utility affecting Safety, Power Quality, Grid Stability - and revenue.

The generator should be sized to consume the fuel - at optimal rate, but will require some type of load control on the generator. Other than that the Utility you are connecting to may have other requirements.

But from a technical standpoint - a Generator on the Grid can be configured to provide pretty much any level of power / current to the grid - up to the point the generator fails.
 

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