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Frequency control of power grid by variable speed drives

IP.com Disclosure Number: IPCOM000239733D
Publication Date: 2014-Nov-27
Document File: 2 page(s) / 274K

Publishing Venue

The IP.com Prior Art Database

Related People

Iiro Harjunkoski: INVENTOR [+3]

Abstract

Frequency control in power grids is traditionally done by power generation units. If the frequency in the grid drops, generation of power is increased. If the frequency rises, generation is reduced. Other demand management techniques like load shedding are also used in frequency control. It is suggested to use variable speed drives in order to provide a frequency reserve or spinning reserve.

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Frequency control of power grid by variable speed drives

The idea belongs to the area of frequency control of power grids with variable speed drives. Frequency control in power grids is also referred to as ancillary services, frequency response reserve or operating reserve.

Frequency control in power grids is traditionally done by power generation units. If the frequency in the grid drops, generation of power is increased. If the frequency rises, generation is reduced. Traditionally, controllable power generation units like coal or gas fired power plants or hydro storage power plants execute this type of tasks in a power grid. There are several levels of control. The fast control approaches which react within minute range still operate in the traditional way. For control with slower response times (>5 minutes), load shedding is becoming more common. Load shedding is a demand response action, where non-crucial consumers shut down or reduce their consumption depending on the power grid’s needs.

As the share of renewable generation is increasing, large conventional power plants get less profitable, with the consequence that some of them are closed down and less conventional generation is available. Demand response / demand side control of the grid frequency can help to overcome this problem. However, the already used load shedding techniques are too slow for fast frequency control which is essential to have a stable power grid. New demand response technics which allow faster control of load are of interest.

The power consumption of variable speed drives (also known as adjustable speed drives, adjustable-frequency drive and variable-frequency drive) can be controlled...