The thesis focuses on a forced-commutated voltage source converter (VSC) connected to a grid in a wind energy application. The work consists of four parts. The first part addresses the type of electrical system which should be used in a wind turbine. The conclusion is to use variable-speed wind turbines, due to higher efficiency, lower noise and lower fatigue. If high power quality is demanded,...

It is economic and secure to determine the optimal siting sizing of offshore wind farms (OWFs) integrated into AC system through voltage-source converter high-voltage direct current (VSC-HVDC) links. In this paper, an planning model for VSC-HVDC-link-based OWFs capacitors proposed, where a decomposition technique presented solve proposed mixed-integer nonlinear programming (MINLP) problem obtai...

در این مقاله یک مدل ریاضی برای مسئله سیستم تولیدی همکارانه ساخت بر اساس سفارش با رعایت انصاف تخصیص بار‌های تولید طراحی شده است. اهداف اصلی مدل، کمینه‌سازی هزینه‌‌های کل و حداکثر استفاده از منابع به‌منظور عادلانه شرایط عدم­قطعیت کنترل پارامتر‌های غیرقطعی روش برنامه‌ریزی فازی ‌شده نتایج نشان می‌دهد افزایش نرخ عدم‌قطعیت، می­یابد. ازآنجاکه ظرفیت کارخانه‌ها ثابت است، مقدار تقاضا، هر کارخانه نیز می­ی...

The interconnection stability of a grid-connected voltage-source converter (VSC) can be assessed by the passivity properties of the VSC input admittance. If critical grid resonances fall within regions where the input admittance acts passively, i.e., has nonnegative real part, then their destabilization is generally prevented. This paper presents an overview of passivity-based stability assessm...

This paper investigates performance of Fuzzy Supervisory Controller (FSC) in control of power converters. A FSC module is added to conventional narrow bandwidth voltage regulator in Power Factor Corrected (PFC), Voltage Source Converter (VSC) to improve DC bus voltage regulation. PFC converter is selected for this work as conventional design of the PFC converter requires narrow bandwidth DC bus...

This paper presents an adaptive variable structure con-troller(VSC) for set-point regulation of a class of non-linear systems. Due to the existence of the sign function , the conventional VSC has the input chattering phenomenon even in the steady state. The method used in this paper essentially solves the problem by using a decreasing switching control input whose size is proportional to the tr...

A iicwly dcsigncd optiinal control mctliod is prcswitcd. The proposcd controller i s dcsigncd via combining classical sink Eecdback conlrol and variable slructure control (VSC). This new method fully matches the merits of the easy design of the linear quadratic (LQ) method and the strong robustiicss o f thc VSC. Thc prescntcd optimal control mcthod is dcnlonstrated on il synchronous reluctance ...

Power synchronization control (PSC) tends to destabilize the VSC connected stiff grid. For addressing this issue, paper proposes a novel scheme named as power self-synchronization (PSSC), which enables operate under grid conditions with short circuit ratio (SCR) from 1 infinity. Similar PSC, proposed method also includes loop, voltage and current loop. Yet, PSSC-based VSC(PSSC-VSC) can be self-...

experimental tests were performed to study the seismic behavior and performance ofmodified steel chevron braced frame systems, which incorporate a vertical slotted connection(vsc) detail between the top of the braces and the floor beam above. the vsc detail isintended to prevent vertical load transfer to the beam and limit brace forces to thecompressive resistance of the members. full-scale qua...

This paper presents an alternate approach for designing power system stabilizers (PSS) based on variable structure control to enhance small signal stability of Single Machine Infinite-Bus Power System (SMIB). The state feedback gains and switching surface have been tuned using Global Optimization (multistart clustering GO) for an Eigen value based performance index. The robustness of the propos...