Inverter-based generators (IBGs) are becoming popular in modern power systems. When the penetration of IBGs is increasing systems, new stability, protection, and monitoring challenges introduced grid. Grid-forming (GFM) control converters seen as a promising solution for future grids to overcome particular stability challenges. Here, technical GFM-based reviewed from point view TSOs academic re...

For the distance protection applied in converter-interfaced renewable energy systems, various AC fault ride-through strategies of sources will cause a large phase difference between operating current relay and current, resulting mal-operation relay. To overcome this issue, paper proposes an active control for systems to enhance reliability This scheme firstly calculates by only using local meas...

The low-frequency oscillation (LFO) problem of photovoltaic (PV) grid-connected systems has been a critical concern for safe operation, whereas the impact dc-side components PV plants are always ignored and single-stage plant is used. This paper performs comprehensive analysis LFOs in two-stage system. complete small-signal model system built. On this basis, LFO modes high-frequency (HFO) calcu...

In this paper, a new circuit is proposed for step-up Z-source inverter based on QZSI (quasi-Z-source inverter). The proposed topology inherits all advantages of the conventional topology. The proposed topology in comparison with conventional topology reduces the ST (Shoot-through) duty cycle by over 25% at the same voltage boost factor. Theoretical analysis of the proposed qZSI in the ST and no...

the cúk converter, which has voltage buck and boost ability, offers high flexibility as an interface device for solar panels. in addition, current ripple can be more reduced because of two input and output inductors at both sides. this paper presents a new application of current-variable inductors in a cúk converter that reduces the size and capacity of storage elements. because of two inductor...

in this paper, a new topology for boost z-source inverterbased on switched-inductor cell is proposed. the operating modes of the proposed inverter are analyzed and also a suitable control method to generate the trigger signals of the inverter is presented. having a common earth between the input source and inverter and capability to generate a higher voltage gain by using lower amounts of the d...