Definition
Droop control is a simple, decentralized method that lets multiple power sources run in parallel and share load without communicating. Each source reduces its real-power output as grid frequency rises and increases output as frequency falls, following a fixed power-frequency slope. Because every unit reacts to the same shared frequency, supply and demand self-balance: a positive power surplus pushes frequency up, prompting every source to back off proportionally.
The droop characteristic
"Droop" is defined by how much frequency must change to move a source from minimum to maximum output. A unit might be tuned to deliver, say, several megawatts for each 0.01 Hz of frequency deviation. A smaller droop percentage means a stiffer, more aggressive response. Traditional synchronous-generator governors implement droop mechanically; grid-forming inverters emulate the same P-ω droop in software, which is how they synchronize and share load with other sources.
Why it matters for on-site generation
For a mining or compute microgrid combining generators, batteries, and inverters, droop control is the mechanism that keeps the system stable when load steps up or down — without a central controller. It is the foundation of primary frequency response and a prerequisite for clean parallel operation of multiple grid-forming sources.
Related terms include the grid-forming inverter and automatic generation control.
In Simple Terms
Droop control is a simple, decentralized method that lets multiple power sources run in parallel and share load without communicating. Each source reduces its real-power…