In the northwest of China, a strategy to transmit wind-thermal–bundled power from local grid and doubly fed induction generator (DFIG)–based wind farms through voltage source converter–based HVDC (VSC-HVDC) can be widely applied. However, since is usually weak, new type electrical oscillation in medium-frequency region may occur sending-end converter (SEC) VSC-HVDC with PQ-control. The mechanis...

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,...

The distribution systems are facing severe power quality problems due to the large number of three phase and single phase linear, non-linear loads. These loads may be supplied from three-phase ac mains with neutral conductor. This creates excessive neutral current, high reactive power and harmonic current burden, load unbalancing, poor voltage regulation, etc. A three-phase fourwire distributio...

This paper proposes a novel direct torque and reactive power control (DTC) for grid-connected doubly fed induction generators (DFIGs) in the wind power generation applications. The proposed DTC strategy employs a variable structure control (VSC) scheme to calculate the required rotor control voltage directly and to eliminate the instantaneous errors of active and reactive powers without involvi...

This paper proposes an implementation of Single Ended Primary Inductor Converter (SEPIC) converter and Voltage Source Inverter for an Induction Motor using Photovoltaic energy as a source. Generally the larger number of drives employed for industrial and commercial applications are induction motor drives. To run such kind of motor from the PV source, it is proposed to have a DCDC converter and ...

Multi-terminal high-voltage direct current technology based on voltage-source converter stations (VSC-MTDC) is expected to be one of the most important contributors future electric power systems. In fact, among other features, it has already been shown how this can contribute improve transient stability in systems by use supplementary controllers. Along line, paper will investigate detail these...

The ability of voltage source converters (VSCs) to restore blackout grid has been widely accepted based on their abilities in flexible and independent power control. However, the traditional literature only studied case a two-terminal hybrid system which all required black start (BS) is provided by single healthy AC grid. Meanwhile, dynamic changes at sending end, including converter, are not c...

Abstract This paper proposes a switched-capacitor voltage buck converter (SC-VBC) with variable step-down controller (VSC) and switching frequency (SFC). The VSC SFC change the ratio of SC-VBC in accordance input load current, respectively, enabling to operate efficiently wide-ranging current. Measurements prototype chip demonstrated that our achieved wide range high efficiency 1.3–2.6 V 69%, r...

In recent years, the use of synchronous generators (SGs) has been displaced due to increased renewable energy sources. These types plants mostly power electronic converters connect grids, which, their mode operation, cannot provide same services. This paper analyzes synchronization Grid-Forming (GFM) without phase-locked loop (PLL) through active control loop. Stability analysis shows that when...

This paper presents Nyström minimum kernel risk-sensitive loss (NysMKRSL) based control of a three-phase four-wire grid-tied dual-stage PV-hybrid energy storage system, under varying conditions such as irradiation variation, unbalanced load, and abnormal grid voltage. The Voltage Source Converter (VSC) enables the system to perform multifunctional operations reactive power compensation, load ba...