Research on grid-forming control technology for distributed renewable energy sources in distribution networks
Yu, Mengqi (2026)
Kandidaatintyö
2026
School of Energy Systems, Sähkötekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2026050840952
https://urn.fi/URN:NBN:fi-fe2026050840952
Tiivistelmä
Under China’s “dual-carbon” targets, the share of distributed renewable energy in distribution networks has continued to grow. Wind power and photovoltaic generation now account for a much higher proportion than before. At the same time, high renewable penetration and the wide use of flexible direct connections have reduced the fault voltage support capability on the grid side of distribution networks. During short-circuit faults, the voltage in the faulted area can drop sharply. Such severe voltage sags may cause large-scale disconnection of distributed renewable sources and local loads. This directly affects the safe and stable operation of the power system. Conventional grid-following control strategies depend strongly on the external grid voltage. In weak grids or under fault conditions, they are often unable to provide sufficient voltage support.
To solve these problems, this paper investigates control techniques for grid-forming distributed renewable energy sources in distribution networks.
The main focus is on their transient voltage support capability during fault conditions. First, the parameter characteristics of distribution feeders are analyzed. The main features of short-circuit faults are also examined. Based on this analysis, the mechanism of fault-induced voltage sags is clarified. Next, typical grid-forming inverter control strategies are studied. Corresponding control models and simulation structures are established. On this basis, a fault ride-through control method suitable for grid-forming distributed renewable energy sources is proposed. The method aims to improve voltage support during faults while limiting the output current.
A simulation model of a grid-forming distributed renewable energy system in a distribution network is built on the MATLAB/Simulink platform. The model is tested under different fault conditions. The simulation results show that the proposed control strategy improves transient voltage performance during faults. It also enhances the fault ride-through capability of the system. As a result, the operational reliability of distribution networks with high renewable penetration is improved.
To solve these problems, this paper investigates control techniques for grid-forming distributed renewable energy sources in distribution networks.
The main focus is on their transient voltage support capability during fault conditions. First, the parameter characteristics of distribution feeders are analyzed. The main features of short-circuit faults are also examined. Based on this analysis, the mechanism of fault-induced voltage sags is clarified. Next, typical grid-forming inverter control strategies are studied. Corresponding control models and simulation structures are established. On this basis, a fault ride-through control method suitable for grid-forming distributed renewable energy sources is proposed. The method aims to improve voltage support during faults while limiting the output current.
A simulation model of a grid-forming distributed renewable energy system in a distribution network is built on the MATLAB/Simulink platform. The model is tested under different fault conditions. The simulation results show that the proposed control strategy improves transient voltage performance during faults. It also enhances the fault ride-through capability of the system. As a result, the operational reliability of distribution networks with high renewable penetration is improved.