Multilevel converters have good potential in high power and voltage applications due to their advantages of reduced or current stress on devices. In recent years, hybrid multilevel converter (HMC) attracted increasing attention since less equipment is required. this paper, the topologies evolutions HMCs are presented, where five topology derivation ways given by using basic cells series-parallel/parallel-series. Some general structures that used generate higher levels also deducted. Then...

Nowadays, most of the doubly fed induction generators (DFIGs) are equipped with rotor crowbar for requirement low voltage ride through (LVRT). The resistance is an important parameter, and it selected taking overcurrent dc link overvoltage limits into consideration. However, impact grid impedance on LVRT performance DFIG not adequately researched. This paper proposed improved method to analyze system influence fill this gap. present would be decreased in future due installation more wind...

The online detection of incipient faults for permanent magnet synchronous machine (PMSM) has been a great challenge in recent decades, where the fault features are extremely trivial and type is normally unknown advance. An discrimination PMSM, including stator interturn short-circuit resistive unbalance fault, proposed this article. First, zero-sequence voltage signal collected component (ZSVC) used to detect abnormal status PMSM. Then, high frequency (HF) signals injected PMSM discriminate...

In recent years, multi-level inverters have had remarkable applications in renewable energy sources, high voltage, and other high-power applications. The inverter has advantages like minimum harmonic distortion can operate on several voltage levels. A is being utilized for multipurpose such as transportation, communication, industrial manufacturing, aerospace active power filter, Static Var Compensator, machine drive. Power electronics equipment reliability very important, to ensure a...

Abstract The advantages, such as the mature control method, less volume of converter and generator, make doubly fed induction generator system prevalent in wind power industry. Nevertheless, is more susceptible to grid faults disturbances. instantaneous high voltage fault may occur due excessive local reactive after achieving low ride through, then turbine might be disconnected again. Hence, not only through but also capability should required for meet code requirements. A comprehensive...

Abstract In recent years, the wind energy conversion system faces significant challenges for stable and secure operations, especially in weak grid due to high penetration of into grid. Doubly fed induction generator (DFIG) is one most popular turbine generators its cost‐effective variable speed low‐cost partial size power converter. Impedance interaction between series or parallel compensated DFIG causes sub‐synchronous resonance (SSR) high‐frequency (HFR). A comprehensive review...

The doubly fed induction generator (DFIG) system is prevalent in the wind power industry due to cost-effective variable speed operation and part size converter. DFIG dynamic performance might be degraded by oscillations of electromagnetic torque instantaneous stator under grid faults. This paper proposes an improved method augment aforesaid scenarios, where additional cascade converter (CC) serially connected at Y-point windings. low-voltage ride through (LVRT) high-voltage (HVRT) with...

In recent years, the doubly fed induction generator (DFIG) operates in a weak grid, rather than strong grid due to high proportion of wind energy into power grid. The impedance interaction between DFIG system and series parallel compensated might cause subsynchronous resonance (SSR) frequency (HFR) system, respectively. Phase locked loop (PLL) is popular synchronization technique, bandwidth PLL can at middle frequencies system. However, impact types their controller dynamics on are not...

Doubly fed induction machines are widely used in wind power conversion system due to the variable speed and low cost part-size converter. The stator flux of Fed Induction Generator (DFIG) oscillates under some operating conditions, i.e. voltage dips grid disturbance which should be damped otherwise will go instability have poor ride through (LVRT) performance. In this paper, a connected distributed generation with DFIG, back converter, dc link capacitor an additional converter called cascade...

The interaction of impedance between the doubly fed induction generator (DFIG) system and series-compensated weak grid gives rise to an issue subsynchronous resonance (SSR). Likewise, high-frequency (HFR) occurs when a DFIG is connected parallel-compensated grid. This paper proposes improved method mitigate caused resonance. method, based on modeling, utilizes additional cascaded converter (CC) at Y-point stator winding with virtual implemented CC control unit, which reshapes for effective...

For maximizing power transfer capacity in a wireless (WPT) system, the operation frequency is normally designed to be same as resonant of receiving side. However, impedance deviation will bring mismatch issue, which causes by various factors, such manufacturing tolerance, aging inductors and capacitors. As result, system efficiency decrease dramatically. This paper proposes switch-controlled capacitor (SCC) scheme compensate load impedance. By detecting zero-cross point current, phase...

Subsynchronous resonance (SSR) and high-frequency (HFR) occurs due to the impedance interaction between DFIG system series compensated parallel weak grid, respectively. Virtual is traditional technique of mitigation in grid-connected applications. To cope with problem that control delay would lead failure virtual impedance, this paper inaugurates model grid considering delay. Then phenomenon revealed for system. It shown fails mitigate negative damping at high frequencies. The phase shift...

In high frequency applications of silicon carbide (SiC) MOSFET, it is easy to be affected by parasitic parameters where crosstalk phenomenon in bridge arm will occur. This paper proposes a novel multi-level gate driver which can suppress the SiC MOSFETs arm. An auxiliary MOSFET branch between and source adopted generate negative zero voltage when turned off. The may reduce positive voltage, voltage. Both simulations experiments are carried out verify feasibility performance proposed driver....

The hybrid modular multilevel converter (MMC) has the advantages of dc fault blocking and overmodulation capability as promising candidate in future multiport HVdc systems. Especially, ability could increase modulation index higher than 1 without voltage distortions on ac side. However, MMC under operations suffer from deviations between half-bridge submodule (HBSM) full-bridge (FBSM) capacitors. In this article, structure self-balancing branches (SBBs) is introduced into to eliminate...

The permanent magnet (PM) machine has been widely applied in the areas of wind power and electric vehicles. As one most common faults, high-resistance connection (HRC) will induce 2nd-order components dq -axis current voltage, which can be used for HRC diagnosis. However, these HRC-introduced are also affected by closed-loop control, ought to taken into consideration an accurate In this study, a mathematical model voltage controlled PM is derived, based on model, new diagnosis method...

The power converters integrated with active decoupling (APD) may handle the ripple in dc link and then reduce volume of filter capacitor dramatically. Generally, voltage current signals LC branch are required for closed-loop APD control. However, sensor failures could degrade control performance even lead to breakdown converter system. This article proposes a detection method circuit single-phase converter. estimated by dual sliding mode observer (SMO). residuals measured calculated, they...

A new Single-sided Variable Flux Permanent Magnet Linear Machine with flux bridge in mover core is proposed this paper. The prevents the leakage from and converts it into linkage, which greatly influences performance of machine. First, a lumped parameter model used to find suitable coil combination no-load linkage machine, reduces computational time drive storage. Secondly, machine replaces expensive rare earth permanent magnets ferrite provides improved controlling capability under variable...

The harshness and uncertainty of the operating environment have caused a large amount anomaly data to wind farms, so clean valid operation are essential for smart power maintenance. Therefore, this paper proposes composite machine learning algorithm based on horizontal vertical quartile method extreme (ELM) recognize speed-power in farm. First, points identified from bilateral relationship speed output by using methods. Second, effects different methods cleaning effect compared, optimal with...

Abstract This article presents two power converters with controllers attached to the Free‐Piston Stirling Linear Generator (FPSLG) and energy storage system (ESS). The rectifier uses hysteresis‐SVPWM current regulation CB‐SPWM, while buck‐boost converter utilizes dual‐loop PI control method. battery receives from a linear‐generator converter. FPSE linear motors in FPSLG convert thermal electrical energy. A two‐level conversion technique using three‐phase AC signal DC DC‐DC has been devised...

Constant frequency double rotor generator (CFDRG) is a novel doubly-fed machine for wind power generation with auxiliary excitation of permanent magnets (PMs). This paper proposes grid connected system employing the CFDRG. The operation PM very crucial to dynamics machine. So under certain disturbances and stability analysis CFDRG are carried out find safe operating limit Notably, gust analyzed in aims dynamic performance system. Theoretical simulations MATLAB have validated effectiveness proposed