The virtual synchronous generator (VSG) was proposed to emulate a machine's dynamics when integrating power electronic converter-based distributed energy resources the grid. However, VSG's synchronization stability during grid faults is not fully explored. underlying mechanism of loss still needs be further revealed due nonlinear characteristics. In this article, step-by-step analytical method based on combining linear and models analyze dynamic behaviors large disturbance. relationship...

The synchronization stability of the virtual synchronous generator (VSG) under grid fault is an important issue for maintaining stable operation in power system. Existing work has pointed out a low-pass filter (LPF) with sufficiently low cutoff frequency reactive control loop (RPCL) can improve transient stability. Yet, underlying mechanism was unknown. Moreover, as key index VSG and precondition stability, response rarely studied. In this article, based on linearized model qualitative...

<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</small> he virtual synchronous generator (VSG) control of a grid-connected converter is an attractive interfacing solution for high-penetration renewable generation systems. Unfortunately, the resonance can appear due to power loops, which are usually damped by adopting resistance (VR). However, effects VR on transient stability VSG rarely studied. In this article, point common coupling and angle...

Standalone photovoltaic-battery hybrid power systems are attractive renewable generation systems, a popular form of which is based on photovoltaic system and battery connected to an output dc bus via buck converter bidirectional buck/boost converter, respectively. Due variation the available sunlight intensity, voltage load condition, system's structures operating modes switched from time time. The dynamic behavior thus quite complex, design for stable operation requires consideration...

<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">A</small> transient damping method (TDM), introducing the frequency of a virtual synchronous generator through high-pass filter (HPF) to power reference, is usually adopted stabilize system against disturbances. However, different from small-signal stability perspective, this letter reveals that gain HPF should not be too large due issues. Thus, an optimal parameter design TDM proposed for...

The power-synchronization control (PSC) method of grid-connected converters, which is based on the active power orientation, a promising solution for high-penetration renewable generation systems. Unfortunately, synchronous frequency resonance (SFR) inevitably found in PSC-controlled especially when connected to inductive networks, seriously damages stability system. relatively small equivalent resistance network regarded as main cause SFR, and virtual resistor (VR) usually employed dampen...

A synchronous rectification buck converter in parallel with a Class AB linear amplifier is presented this paper to construct an envelope-tracking (ET) power supply. To eliminate the influences of output voltage on current, full feedforward output-voltage scheme two terms proposed paper, which can counteract all load admittances amplifier, respectively, consequently decreasing current substantially. An ET supply prototype 100-kHz sine-wave tracking, 5-15 V voltage, and 75-W-peak fabricated...

Due to the exhaustion of fossil energy, utilization renewable energy resources is developing quickly. intermittent nature resources, storage devices are usually adopted in power generation system enhance reliability. In this paper, photovoltaic-based DC microgrid (PVDCM) designed, which composed a solar and battery connected common bus via boost converter bidirectional buck/boost converter, respectively. As photovoltaic (PV) panels might operate maximum point tracking (MPPT) mode or constant...

Stand-alone hybrid renewable power generation systems have gained popularity in recent years. However, due to the intermittent nature of resources, are often designed operate with multiple structures and operating modes. The design for stable operation such requires consideration stability conditions all possible A stand-alone photovoltaic-battery system is studied illustrating complex behavior this paper. We reveal smooth bifurcation, including slow-scale Neimark-Sacker fast-scale...

In this work, a betavoltaic combined with photovoltaic mechanism using strontium-90 as radioactive source was built up. A transparent yttrium aluminum garnet ceramic doped cerium ion is used an intermediate conversion layer to avoid direct irradiation semiconductor device and translates most of the high energy beta particles into photons. The traditional crystalline silicon N+PP+ junction structure functions simultaneously. Radiation resistance demonstrated by 0.9 MeV electron beam aging...

This paper presents a novel phase-locked loop (PLL) structure for improving the transient stability of grid-connected converters by introducing voltage normalization control (VNC) in conventional PLL. First, underlying mechanism losing synchronization during grid fault is analyzed, and it revealed that key factor significant decrease magnitude at point common coupling (PCC). In order to avoid damping ratio due dips, method introduced controlling d-axis rated value even faults. To this end,...

Envelope-tracking (ET) technique is one of the most promising methods to improve efficiency modern wireless communication transmitters, which based on using a high-efficient power supply provide varying voltage RF amplifier. For this application, letter adopts an AB-type linear amplifier and synchronous rectification buck converter connected in parallel at output construct ET supply. The features wide bandwidth makes follow envelope transmitted signal; high provides load current. An average...

Impedance-based criteria are often used for assessing the stability of cascaded converter systems. In this paper, it is pointed out that switching ripple interaction (SRI) between source and load in a system would change gain pulsewidth modulation converter, causing cut-off frequency phase margin to accordingly. Thus, even if shown be stable under an impedance-based criterion, can, fact, unstable due SRI. This paper proposes adaptive sample-and-hold method eliminating effect A 48 V-12 V-5 V...

Two measurement schemes, namely, the modulation signal perturbation scheme and pulse scheme, have been used for evaluating loop gain of dc-dc converters. However, two measured gains do not give consistent results due to use different forms injected small signal, difference in schemes cannot be distinguished by usual averaged model. In this paper, are analyzed based on an extended-frequency-range small-signal Expressions derived their stability assessment derivation closed transfer functions...