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The high power self-commutated VSC are the key control devices in HVDC, FACTS and DFACTS systems. The self-commutated voltage source converter back to back (VSC BTB) link connects two ac power systems asynchronously, can control the active power exchanged between the two ac system and the reactive powers at the both terminals independently. To achieve the expected control objectives suitable control...
The parallel connection of power electronic converters has had an increasing demand due the need of higher power. A desired feature in these connections is equal and stable current sharing among the converters. However this is not possible in real systems where factors as aging or heating cause mismatch in the parameters. This paper presents a passivity-based controller design which achieves equal...
The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, a robust control for variable speed wind power generation that incorporates a doubly feed induction generator is described. In the presented design it is applied the so called vector control theory. The proposed control scheme uses stator flux-oriented control for the...
This paper proposes a dynamic model and control strategy for the voltage source converter based high voltage direct current transmission (VSC-HVDC) under fault AC conditions. After simplify the equivalent circuit of the VSC transmission system, a VSC-HVDC electromagnetic transient model which considering the loss of the phase reactors has been built. To restrain the DC voltage double line-frequency...
This paper compares the performance of angle and frequency droops in an autonomous microgrid that only contains voltage source converter (VSC) interfaced distributed generators (DGs). As a VSC can instantaneously change output voltage waveform, power sharing in a microgrid is possible by controlling the output voltage angle of the DGs through droop. The angle droop is able to provide proper load sharing...
The aim of this paper is to propose and compare two multivariable current controllers of voltage source converters (VSCs) connected to the grid through an LCL filter. The first proposal is a linear quadratic (LQ) servocontroller, which uses a full-order estimator to obtain the full state vector. The second proposal is based on the internal model control (IMC). The behavior of both controllers is tested...
The aim of this paper is to propose a multivariable current controller of voltage source converters (VSC) connected to the grid through an LCL filter. The proposal is a linear quadratic (LQ) servocontroller, which uses a fullorder estimator to obtain the full state vector. Two kinds of estimators are proposed and compared: prediction estimator and Luenberger estimator. The behavior and robustness...
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