Power-Sensitivities-Based Indirect Voltage Control of Renewable Energy Generators With Power Constraints

Abstract

Recently, renewable energy has received considerable attention worldwide due to environmental problems such as climate change. However, there are still many problems to be solved to increase the penetration level of renewable energy sources in a power system. Above all, a power system with a high renewable penetration level requires an entirely novel operational strategy and control approach to achieve reliable operation by considering the intermittency of variable renewable energy sources. This paper proposes power-sensitivities-based indirect voltage control of renewable energy generators with power constraints. The proposed method realizes seamless control of the voltage by compensating with the reactive power if the real power of the distributed generator (DG) is insufficient due to its intermittency. To achieve the proposed method, the real and reactive power references of DGs are initially operated based on the power sensitivities between generation and loads if all the DGs operate within the power constraints. However, if at least one of the DGs reaches its constraint limit, the references can be modified using other sensitivities between real and reactive power generation enabling indirect voltage control of DGs. Therefore, a high level of renewable penetration in power systems can be accomplished with the proposed method. The proposed method is verified with several case studies that are based on a microgrid with practical data from a real island power system. Verification is carried out using the power system computer aided design and electromagnetic transient including DC (PSCAD/EMTDC TM ) simulation software.INDEX TERMS Distributed generation, indirect voltage control, power sensitivity, renewable energy, variable renewable energy, voltage stability.

A Novel Strategy for Monitoring a PV Junction Box Based on LoRa in a 3 kW Residential PV System

“…The South Korean government has been implementing the 'Renewable Energy 3020 policy since 2017 to lower the average temperature of the Earth, which is rising amid global climate change, and to reduce greenhouse gas emissions [1,2]. The plan is to increase the proportion of power generation from renewable energy with low carbon emissions to 20% by 2030, of which PV power generation accounts for 57% (36.5 GW) [3]. Solar power supply facilities in various forms are expected to increase in the future, and a remote monitoring system for each system is being operated for the seamless control and management of these power generation facilities [4,5].…”