Analysis of the Influence of Renewable Generator Frequency Endurance Capability on Low-Frequency Load Shedding: A Hunan Case Study

Abstract

With the rapid development of renewable generators such as distributed photovoltaic and profound changes of the power structure, this paper analyzes the frequency characteristics of the power system with high penetration of renewable generations in the process of low-frequency load shedding and discusses the influence of the distributed renewable generator frequency endurance capabilities on the implementation effect of low-frequency load shedding in detail. Finally, the influences of the distributed renewable generator frequency endurance capability and the capacities of the distributed renewable generator on frequency response characteristics of an actual Hunan power grid are simulated. The simulation results show that more distributed photovoltaic capacity without frequency endurance capability leads to deeper frequency drops after the disturbance and requires more basic rounds of load shedding. When the penetration rate of distributed photovoltaic is too high, it may cause load shedding, resulting in power grid load losses and, at the same time, leading to an overshoot phenomenon in the process of frequency recovery. Therefore, the influence of distributed photovoltaic on the control of low-frequency load shedding should be considered when designing low-frequency load shedding schemes for the power grid with high penetration of distributed photovoltaic.

Optimize Ranking and Load Shedding in Microgrid Considering Improved Analytic Hierarchy Process Algorithm and Power Stability Index

“…Step 1: Calculate the V Li variance among the parameters of n−1 loads in the same criterion C, except for the ith load in the same criterion C. V Li is computed following to Equation (6).…”

“…In which, the two main concerns are the economic aspect and the technical aspect. Awad and Hafez [4], Horri and Mahdinia Roudsari [5], Shen et al [6], and Hussain and Shakir Al-Jubori [7], technical factors such as frequency and voltage quality were focused on, while economic issues such as compensation for damage caused by disconnected loads have not been mentioned. Besides, the voltage quality after load shedding has not yet been carefully considered.…”