Improving the transition capability of the low-voltage wind turbine in the sub-synchronous state using a fuzzy controller

Abstract

The main problem of wind turbines is associated with induction generators in their power supply during short circuits in the grid. In this research, a new method is presented for the uninterrupted operation of a wind turbine equipped with an induction generator fed on both sides of feeding during network errors. Wind farms equipped with a doubly-fed induction generator (DFIG) require two abilities to allow system operators to increase proficiency. These capabilities include fault ride-through and synchronization of output force fluctuations, especially when these generators generate significant electrical power. A MATLAB® software environment has been used to evaluate and improve the performance of these turbines. A fuzzy complement (FC) controller is used to improve the performance of the DFIG. The results demonstrate that this controller limits the operation of the turbine current and voltage in the short-circuit mode well. Regarding results obtained from comparing two different modes, it can be said that ripple is 4% in the FC mode, while this parameter is equal to 10% for the proportional-integral controller.

A device for detecting current asymmetry in a three-phase alternating current system

“…When the currents 𝐼𝐼 1 , 𝐼𝐼 2 , and 𝐼𝐼 3 3 are equal to each other, then their magnetic fluxes Ф 1 , Ф 2 , and Ф 3 are equal, and the difference magnetic fluxes are zero, i.e.∆Ф 12 = 0 and∆Ф 23 = 0. Therefore, the EMF of 𝐸𝐸 𝑜𝑜𝑜𝑜𝑜𝑜12 and 𝐸𝐸 𝑜𝑜𝑜𝑜𝑜𝑜23 at the ends of the output windings 9 are also zero [15,16].…”

A Multi-Objective Optimization Approach of Smart Autonomous Electrical Grid with Active Consumers and Hydrogen Storage System

“…The implementation of the smart grids technology in the autonomous electrical grids [7] have optimal effects on the reliability and economic indices in such system [8], [9]. Hence, operation of the autonomous electrical grids [10], due to lack of the energy resource with high capacity like energy transmission lines [11], [12], from power plant should be performed [13] as reliable with minimum generation costs [14], [15]. On the other side, in smart grids the consumers can be managed self-demand [16], [17] at critical times such as energy shortcoming in generation side to prevent blackout [18], [19].…”

“…( 12). The power bound, ramp up and ramp down of the DGs are given by constraints ( 13)- (15), respectively.…”

Optimal Dispatch of the Energy Demand in Electrical Distribution Grid with Reserve Scheduling

“…Hence, smart grid has been provided, communication links among the electricity companies and the consumers to improve economic and technical indices [7]- [10]. As well, with integration of the smart grids in electrical grids, consumers can be participated in energysaving subject to electricity prices signals [8]- [11]. The participation of the consumers can be considered as reserve source in electrical grids, in order to decreasing energy generation at peak demand [8].…”

“…As well, with integration of the smart grids in electrical grids, consumers can be participated in energysaving subject to electricity prices signals [8]- [11]. The participation of the consumers can be considered as reserve source in electrical grids, in order to decreasing energy generation at peak demand [8]. In this solution, consumers have generator role, and power generation in power plans are reduced at peak demand [11].…”