The uninterruptible operation of grid-connected renewables under the occurrence grid voltage sags is addressed in this work. This achieved due to incorporation an enhanced control algorithm a renewable source. low-voltage ride-through was developed accordance profile introduced by IEC 61400-21 regarding sags. To guarantee continuous agent during sags, not only instantaneous reactive power but a...

When integrating multi-grid renewable energy systems, modular multi-level converters (MMCs) are promising for high-voltage DC (HVDC) transmission. Because of the characteristics system, however, it is more difficult to prevent a fault at terminal than AC MMC. Accordingly, ride-through (FRT) strategy operation MMC in required stable system operation. In this paper, solution closed-circuit overcu...

One of the most crucial control aspects in electric power networks is ensuring constant voltage levels throughout different circumstances. To overcome this problem, an automatic regulator (AVR) installed electrical to preserve at its allowable range. In paper, a fuzzy-based PID controller was used enhance AVR dynamic performance under several operating conditions. Moreover, Equilibrium Optimize...

When a renewable energy station (RES) connects to the rectifier (RS) of modular multilevel converterbased high-voltage direct current (MMC-HVDC) system, voltage at point common coupling (PCC) is determined by RS control methods. For example, may become saturated under fault, and causes change from an equivalent source source, making fault analysis more complicated. In addition, grid code ride-t...

With the increase in doubly fed induction generator-based wind energy conversion systems (DFIG-WECS) worldwide, improving fault ride-through (FRT) capability of entire system has been given much attention. Enhancement FRT a DFIG-WECS is conventionally realized by employing flexible AC transmission device with proper control system. This paper presents non-conventional method for improvement DFI...

As the grid codes of wind turbines note, doubly fed induction generator (DFIG)-based energy conversion system (WECS) should maintain uninterrupted operation during certain voltage faults. To meet codes, a novel configuration DFIG-based WECS is proposed in which superconducting magnetic storage (SMES) and series transformer are incorporated. The control strategies redesigned to smooth output pow...

The LVRT (Low Voltage Ride Through) is the main characteristic of every power system in faulty conditions. When fault occurs, it is essential for power system such as microgrid to control the voltage and frequency normally. Naturally in fault status, the unbalanced voltage and current are inevitable, but with the aid of LVRT technique, microgrid can keep stability in main system parameters such...