A novel phase-locked loop applied on frequency fluctuation of EAST power supply

Tan, Ling; Fu, Peng; Wu, Yanan; Lü, Jing; Shen, Xiaomei; Li, Jun; Tian, Yunxiang

doi:10.1016/j.egyr.2020.11.214

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…When the supercritical unit boiler system debugs the power supply operation to reach the terminal sliding mode surface

{h_v}

, at this time, the tracking error of the

{h_v} = 0

, DC input voltage uses

C_{{e_v}}^ * + C\alpha sig{n^{q/p}}{e_v} = 0

to represent the dynamic behaviour [18], and (0, 0) to represent the terminal attractor in the phase plane

( {{e_v},{{\dot e}_v}} )

, which can be obtained as follows:

\begin{equation}C\alpha sig{n^{q/p}}\left( {V_c^ * - {V_c}} \right) + C\frac{{dV_c^ * }}{{dt}} + \frac{{{V_c}}}{{\hat R}} - {i_L} = 0\end{equation}

…”

Section: Supercritical Unit Boiler System Debugging Power Supply Circ...mentioning

confidence: 99%

“…When the supercritical unit boiler system debugs the power supply operation to reach the terminal sliding mode surface h v , at this time, the tracking error of the h v = 0, DC input voltage uses C * e v + C 𝛼sign q∕p e v = 0 to represent the dynamic behaviour [18], and (0, 0) to represent the terminal attractor in the phase plane (e v , ̇ev ), which can be obtained as follows:…”

Section: Dual Closed-loop Terminal Sliding Mode Controlmentioning

confidence: 99%

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Power supply circuit model and sliding mode control of supercritical unit boiler system commissioning

Lin

Wei

2023

The Journal of Engineering

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In the process of power control and commissioning of supercritical unit boiler system, there are some problems such as large steady-state error and slow response speed. In order to optimize the control performance of supercritical unit boiler system, the power supply loop model and sliding mode control method of supercritical unit boiler system debugging power supply are proposed. Firstly, the power supply circuit model is established according to the data of voltage doubling rectifier circuit, inverter circuit, high frequency transformer and LC resonant circuit. Secondly, the capacitance voltage value and the inductance current value are calculated in the power supply circuit model. Finally, based on the numerical results, a terminal sliding mode controller and a linear sliding mode controller are established to complete the double closed-loop terminal sliding mode control and realize the power control of the debugging power supply. The experimental results show that when the input voltage is 50 V and the current is 14 V, the input voltage and current waveforms remain stable. When the input voltage is between 40 and 50 V, the change of switching frequency is small, only increasing from 22 to 26 kHz. The steady state of the power supply is high, and when the input voltage increases, the DC offset is 21.2. The convergence time in the calculation process is less than 200 ms. The instantaneous change of inductance is 0.7 A. The steady-state error is less than 0.005 V. The output voltage distortion rate is less than 4%. It is proved that this method has strong control performance in the supercritical unit boiler system.

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“…When the supercritical unit boiler system debugs the power supply operation to reach the terminal sliding mode surface

{h_v}

, at this time, the tracking error of the

{h_v} = 0

, DC input voltage uses

C_{{e_v}}^ * + C\alpha sig{n^{q/p}}{e_v} = 0

to represent the dynamic behaviour [18], and (0, 0) to represent the terminal attractor in the phase plane

( {{e_v},{{\dot e}_v}} )

, which can be obtained as follows:

\begin{equation}C\alpha sig{n^{q/p}}\left( {V_c^ * - {V_c}} \right) + C\frac{{dV_c^ * }}{{dt}} + \frac{{{V_c}}}{{\hat R}} - {i_L} = 0\end{equation}

…”

Section: Supercritical Unit Boiler System Debugging Power Supply Circ...mentioning

confidence: 99%

Section: Dual Closed-loop Terminal Sliding Mode Controlmentioning

confidence: 99%

Power supply circuit model and sliding mode control of supercritical unit boiler system commissioning

Lin

Wei

2023

The Journal of Engineering

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“…The first type of method is to place a filter before the input of the PLL (i.e. pre-filtering), such as Moving Average Filter (MAF) and Notch Filter (NF) are included in SRF-PLL [7][8][9][10][11]. Although this method will not affect the bandwidth of the PLL, a phase compensation unit and a frequency adaptation link must be added to ensure normal operation.…”

Section: Introductionmentioning

confidence: 99%

Analysis and modelling of a phase‐locked loop based on a novel cascade structure of SOGI

Ke,

2023

IET Power Electronics

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In order to attenuate the oscillations on the estimated frequency of a phase‐locked loop (PLL), the effective suppression of low‐order harmonics in grid voltage is a crucial issue in three‐phase grid‐connected inverters, which use the standard PLL based on a double second‐order generalized integrator (DSOGI‐PLL). Analysis shows that the SOGI module exerts a stronger filtering effect in generating the quadrature signal than the in‐phase signal. In this context, two novel cascaded SOGI module filtering structures have been developed, based on which the PLLs are proposed. In comparison to the previously proposed method for addressing the problem of input voltage harmonics, the proposed method has stronger filtering ability and can flexibly select the levels of SOGI module cascading based on the degree of grid voltage distortion to achieve a balance between system dynamic performance and filtering performance. The proposed PLLs' approximation small signal model is established, and the method for designing the system control parameters is also provided. In the case of frequency steps, phase angle jumps, harmonic injection, and unbalanced voltage sag, Matlab modelling and experimental results demonstrate that the proposed PLLs can efficiently extract the frequency and phase of the fundamental positive sequence component and behave better in steady‐state and dynamic performance.

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Operation and Startup of Three-Phase Grid-Connected PWM Inverter for an Experimental Test Bench With DSPACE Real-Time Implementation of PQ Control

Elyaalaoui

Labbadi

Chigane

et al. 2022

Advances in Environmental Engineering and Green Technologies

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The main objective of this chapter is the experimental validation of active and reactive power control at the connection point for a three-phase grid connected inverter. It gives an overview on the adopted vector control strategy, regulation of the angle of orientation of the blades (pitch control), synchronization grid side converter to the power network using phase closed loop (PLL). Once the experimental test bench is described, the authors devote a first part to the design of the block circuit diagram of the experimental platform and the control strategy implemented in the DSPace DS1104, and they suggest some steps to associate the inverter to the electrical network. Subsequently, they discuss the experimental results validating the proposed power control. The purpose of this experimental results is the DSPACE real-time implementation of PQ control using three-phase inverter and development of a startup algorithm of the experimental test bench.

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A novel phase-locked loop applied on frequency fluctuation of EAST power supply

Cited by 3 publications

References 12 publications

Power supply circuit model and sliding mode control of supercritical unit boiler system commissioning

Power supply circuit model and sliding mode control of supercritical unit boiler system commissioning

Analysis and modelling of a phase‐locked loop based on a novel cascade structure of SOGI

Operation and Startup of Three-Phase Grid-Connected PWM Inverter for an Experimental Test Bench With DSPACE Real-Time Implementation of PQ Control

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