Conference paper
Comparison between AGC and a tuningless LFC approach based on direct observation of DERs
Department of Electrical Engineering, Technical University of Denmark1
Center for Electric Power and Energy, Centers, Technical University of Denmark2
Energy System Management, Center for Electric Power and Energy, Centers, Technical University of Denmark3
Distributed Energy Resources, Center for Electric Power and Energy, Centers, Technical University of Denmark4
Automatic Generation Control (AGC) used in secondary frequency control requires manual tuning to maintain a balance between reaction speed and stability. This task becomes increasingly difficult due to the rising number of inverter-coupled devices and High-Voltage Direct Current (HVDC) links, and the resulting reduction of available inertia.
In this paper, we propose a tuningless Load-Frequency Control (LFC) approach able to cope with the changing dynamics of electric power grids. Harnessing the possibilities of modern monitoring and communication means, the so-called Direct Load-Frequency Control (DLFC) employs two concurrently operating processes: a power matching stage responsible for secondary power adjustment using directly observed area imbalances; and a frequency control stage that adjusts primary reserves' frequency setpoints in a systematic manner.
As opposed to the AGC, the DLFC does not require an integrator to mitigate frequency deviations. The only free parameter is the secondary control interval, from which all other parameters are derived. Small-signal stability investigations show that the DLFC exhibits 40 dB falloff of steady-state deviations versus the AGC's 20 dB.
Simulations on the non-linear singlearea system confirm the DLFC's response speed and stability advantage.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2017 |
| Pages: | 1-6 |
| Proceedings: | 52nd International Universities' Power Engineering Conference |
| ISBN: | 1538623447 , 1538623455 , 9781538623442 and 9781538623459 |
| Types: | Conference paper |
| DOI: | 10.1109/UPEC.2017.8231931 |
| ORCIDs: | Prostejovsky, Alexander Maria and Marinelli, Mattia |
Automatic Generation Control Distributed Systems Load Frequency Control Low Inertia Systems Power Quality Renewable Energy Sources SDG 7 - Affordable and Clean Energy
Automatic generation control DLFC's response speed Direct Load-Frequency Control Frequency control High-Voltage Direct Current links Observability Power system stability Stability criteria Thermal stability electric power grids frequency control frequency control stage frequency deviations high-voltage engineering invertors load regulation manual tuning noise figure 20.0 dB noise figure 40.0 dB power grids power matching stage power system stability secondary control interval secondary frequency control secondary power adjustment small-signal stability investigations tuningless LFC approach tuningless Load-Frequency Control approach
