A Static Synchronous Compensator for Displacement Power Factor Correction under Distorted Mains Voltage Conditions

1970 ◽  
Vol 110 (4) ◽  
pp. 71-76
Author(s):  
R. Cimbals ◽  
O. Krievs ◽  
L. Ribickis
Keyword(s):  
Control System ◽  
Power Factor ◽  
Pi Controller ◽  
Current Control ◽  
Control Loop ◽  
Static Synchronous Compensator ◽  
Distorted Grid ◽  
Simulation Results ◽  
Transient And Steady State ◽  
Steady State Performance

A STATCOM system is presented in this paper applied for compensation of displacement power factor under distorted mains voltage conditions. The developed STATCOM control system consists of two regulating loops - DC link voltage control loop with anti-windup PI controller and the current control loop with a feed-forward PI controller. The simulation results indicate that the developed control system performs well, ensuring displacement power factor compensation with good transient and steady state performance even under significantly distorted grid voltage conditions. Ill. 15, bibl. 8 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.110.4.291

scholarly journals Phase Voltage-Oriented Control of a PMSG Wind Generator for Unity Power Factor Correction

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5693
Author(s):  
Ming-Fa Tsai ◽  
Chung-Shi Tseng ◽  
Bor-Yuh Lin
Keyword(s):  
Control System ◽  
Power Factor ◽  
Power Factor Correction ◽  
Pi Controller ◽  
Control Loop ◽  
Phase Voltage ◽  
Unity Power Factor ◽  
Pass Filter ◽  
Wind Generator ◽  
Three Phase

This paper presents the power factor control of a permanent magnet synchronous wind generator (PMSG) wind turbine using a phase voltage-oriented control (PVOC) scheme, which is different from the conventional rotor flux-oriented control (RFOC) method and without using a rotor position sensor or sensorless estimator. The proposed control system is operated in two separately synchronously rotating d-q frames. One is for a phase-locked loop (PLL) and the other is for the PVOC current control loop. A PI controller functioned as a low-pass filter in the PLL loop is designed for extracting the phase voltage angle for the coordinate transformation between the stationary α-β frame and the synchronously rotating d-q frame in the PVOC control loop. The d-q modeling of the PMSG with the three-phase voltage vector aligned on the d-axis is then derived and based on which an another PI controller followed by decoupling control is designed, so that the three-phase currents are in phase with the three-phase output voltages of the wind generator for unity power factor correction. The simulation results in PSIM show the performance of the proposed control system which is also experimentally verified by using a TI TMS320F28335 digital control chip.

Electrostatic Suspension System for Gyroscopes with Minimum Electrical Disturbing Torque via Non-Linear Pre-Compensation

1996 ◽  
Vol 210 (2) ◽  
pp. 123-127 ◽  
Author(s):  
W Q Yang
Keyword(s):  
Control System ◽  
Steady State ◽  
Position Control ◽  
Complete System ◽  
Suspension System ◽  
System Operation ◽  
Non Linear ◽  
Position Control System ◽  
Transient And Steady State ◽  
Steady State Performance

The new electrostatic suspension system (ESS) presented here is applicable to electrostatically suspended gyroscopes (ESG). The electrical disturbing torque (EDT) acting on the gyro rotor is reduced to much lower levels than possible with the conventional methods, thereby increasing the attainable accuracy of the instrument. This is achieved by eliminating the conventional pre-load voltage and instead applying only control voltages via an analogue non-linear pre-compensator to achieve linear position control system operation despite the square law relating the suspension force to the applied voltage. The transient and steady state performance of the complete system, with changes in position reference and external disturbing forces, are examined with the aid of computer simulations.

Resource Efficient Architecture for Current Control Loop of Two PMSMs

2015 ◽  
Vol 741 ◽  
pp. 619-622
Author(s):  
Cho Lung Ryang ◽  
Da Ling Wang
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Pi Controller ◽  
Current Control ◽  
Resource Consumption ◽  
Control Loop ◽  
Verilog Hdl ◽  
Control Loops ◽  
System Generator ◽  
Pi Controllers ◽  
Closed Current

This paper presents a novel closed current control loop of permanent magnet synchronous motor (PMSM). Conventional current control loops need two PI controllers per one PMSM. The paper provides a method for reduction of the resource consumption by using one PI controller for two PMSM. Combining with Black Box Blockset written by Verilog HDL based on Xilinx System Generator, one effective PI controller is designed instead of four PI controllers and simulated using Simulink. The utilization of FPGA resources is verified by Xilinx ISE 14.7 tool. The results show that the proposed method can reduce resource consumption and do not influence system performances observably.

Design of Dynamic Control on Underwater Vehicle

2011 ◽  
Vol 138-139 ◽  
pp. 333-338
Author(s):  
Guan De Lun ◽  
Yan Cong Liu ◽  
Peng Yi ◽  
Yang Qu
Keyword(s):  
Control System ◽  
Dynamic Control ◽  
Underwater Vehicle ◽  
Underwater Vehicles ◽  
Control Model ◽  
Time Varying ◽  
Control Loop ◽  
Negative Feedback Control ◽  
Simulation Results

Considering the effects in the gravity, buoyancy, thrust and hydrodynamic on the underwater vehicle, based on the perspective of the dynamic control, established a relatively complete dynamic model of underwater vehicle, analyzed and designed the control system on this base. The control system is consisted of two control loop. Dynamic compensation of the within control loop based on the dynamic characteristic of the vehicle, by the role of the within control loop, the vehicle became an easy to control and a decoupled linear system. Outer control loop achieved a negative feedback control through the use of proportional and differential item on the actual vehicle pose and the posture deviation expected. Adjusted by adjusting the parameter matrix Kd, Kpcan get the desired attenuation of the error, which can achieve precise motion control of underwater vehicles. Simulation results show that: the control model, in the paper, can be built for dynamic control of underwater vehicles, there is a strong anti-interference ability, can better realize the theory of time-varying trajectory tracking.

Research and Analysis about Static Synchronous Compensator Control

2013 ◽  
Vol 380-384 ◽  
pp. 425-429 ◽  
Author(s):  
You Jie Ma ◽  
Yi Li
Keyword(s):  
Differential Geometry ◽  
Control System ◽  
Intelligent Control ◽  
Pid Control ◽  
Current Control ◽  
Control Methods ◽  
Static Synchronous Compensator ◽  
Direct Current Control ◽  
Indirect Current Control ◽  
Specific Control

This paper describes the basic requirements of the Static Synchronous Compensator (STATCOM), analyze the specific structure of the STATCOM control system and the function of various parts can be achieved, analysis Linear PID control, Linear optimal control , Adaptive control, Differential geometry control and Intelligent Control which commonly used in the STATCOM control system. Describes two specific control methods of the STATCOM: direct current control and indirect current control.

scholarly journals Current control of grid-connected inverter using integral sliding mode control and resonant compensation

2019 ◽  
Vol 10 (2) ◽  
pp. 1022
Author(s):  
Seung-Jin Yoon ◽  
Thanh Van Nguyen ◽  
Kyeong-Hwa Kim
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Voltage Control ◽  
Current Control ◽  
Control Loop ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Distorted Grid ◽  
Capacitor Voltage ◽  
Grid Connected Inverter

<p>To eliminate the adverse effect from parameter variations as well as distorted grid conditions, a current control scheme of an LCL-filtered grid-connected inverter using a discrete integral sliding mode control (ISMC) and resonant compensation is presented. The proposed scheme is constructed based on the cascaded multiloop structure, in which three control loops are composed of grid-side current control, capacitor voltage control, and inverter-side current control. An active damping to suppress the resonance caused by LCL filter can be effectively realized by means of the inverter-side feedback control loop. Furthermore, the seamless transfer operation between the grid-connected mode and islanded mode is achieved by the capacitor voltage control loop. To retain a high tracking performance and robustness of the ISMC as well as an excellent harmonic compensation capability of the resonant control (RC) scheme at the same time, two control methods are combined in the proposed current controller. As a result, the proposed scheme yields a high quality of the injected grid currents and fast dynamic response even under distorted grid conditions. Furthermore, to reduce the number of sensors, a discrete-time reduced-order state observer is introduced. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed scheme.</p>

scholarly journals Current PIλ Control of the Single-Phase Grid Inverter

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Xueqin Yang ◽  
Xingyu Liu ◽  
Jichao Li ◽  
Binbin Zhang
Keyword(s):  
Control System ◽  
Steady State ◽  
Fractional Order ◽  
Single Phase ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Fractional Order Pi Controller ◽  
Control System Model ◽  
Steady State Performance

In a grid-connected power generation system, the grid-connected current of the inverter is sensitive to nonlinear factors such as periodic disturbance of grid voltage, which results in grid-connected current waveform distortion. By establishing a single-phase photovoltaic grid-connected inverter control system model, designing an inverse current fractional-order PI (PIλ or FO-PI) controller and the dynamic and steady-state performance, antidisturbance and grid connection inversion characteristics of the system are simulated and compared under the action of the integer-order PI controller and fractional-order PI controller. The quality of the inverter grid-connected current is analyzed by using the fast Fourier transform (FFT). The simulation results show that the fractional-order control system can reduce the total harmonic distortion (THD) of the grid-connected current and dynamic performance and antidisturbance ability of the improving system while satisfying the steady-state performance indexes.

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