It tends to cause system oscillation when the inverter with a phase-locked loop based on proportional integral controller (PI-PLL) is connected weak grid. To improve suppression ability of grid-connected inverter, linear active disturbance rejection applied PLL (LADRC-PLL). Considering influence extended state observer, voltage outer-loop, current inner-loop, and frequency coupling, admittance ...

Today, and especially with the growing interest in distributed renewable energy sources (DRESs), modern electric power systems are becoming more complex. In order to increase DRES penetration, grid side converter (GSC) control techniques require appropriate synchronization algorithms that able detect voltage status as fast accurately possible. The drawbacks of published phase-locked loop (PLL) ...

The performance of a modular multilevel converter (MMC) is highly related to the three-phase phase-locked loop (PLL). presence DC component, harmonic and negative sequence component results in poor dynamic steady-state PLL, such as fundamental frequency oscillations phase estimated by PLL. In order suppress influence parameters variation disturbance grid voltage, an improved PLL with moving ave...

The multilayers of poly(L-lysine) (PLL) and hyaluronic acid (HA) were constructed by alternating deposition of PLL at high pH and HA at low pH. The exponential growth of the multilayer was proved to be amplified by increasing the pH difference between the two deposition solutions. The exponential growth multilayers of PLL/HA assembled at different pH were utilized as reservoirs for loading a tr...

(VCO) phase-locked loop (PLL) and ring-VCO PLL topologies with low-phase noise. Differential control loops are used for the PLL locking through a symmetrical transformer-resonator or bilaterally controlled varactor pair. A differential compensation mechanism suppresses out-band spurious tones. The prototypes of the proposed PLL are implemented in a CMOS 65-nm or 45-nm process. The measured resu...

30 to 40% of Hartley strain guinea pigs have previously been demonstrated to possess a dominant autosomal gene which enables them to recognize the antigenicity of hapten-poly-L-lysine conjugates as expressed by the development of both antihapten antibodies and delayed hypersensitivity to the immunizing antigen. In the present study, it was shown that PLL alone was weakly antigenic in such genet...

A Digital PLL is designed with improved acquisition time and power efficiency. The implemented D-PLL can operate from 6.54MHz to 105MHz with a power dissipation of is 7.763μW (at 210MHz) with 1.2V supply voltage. The D-PLL is synthesized using cadence RTL compiler in 45nm CMOS process technology.

Jitter is extremely important in PLL based systems. The effects of jitter range from not having any effect on system operation to rendering the system completely non-functional. Reducing Jitter and power supply is one way to help to improve the system performance. This review will concentrate on jitter and power supply in PLL building blocks. KeywordsLOW POWER, LOW JITTER, PFD, PLL ____________...

BACKGROUND: T-cell prolymphocytic leukemia (T-PLL) is a post-thymic T-cell malignancy with aggressive clinical course. Although T-PLL has been referred to under different designations, it is a distinct clinico-biological entity and should be distinguished from other T-cell disorders. METHODS: The literature on T-PLL is reviewed. Experience on the clinical and laboratory features, differential d...

Abstract This study focuses on stability of weak grid connected voltage source converter (WG‐VSC) in Low‐frequency mode (LFM) (around 1–10 Hz), which is dominated by interactions among phase‐locked loop (PLL), outer control and condition. In order to clearly reveal LFM mechanism WG‐VSC, a simple but effective PLL‐equivalent model has been proposed. First, generic small signal consisted PLL ‘out...