This paper proposes a new controller design for three-phase uninterruptible power supply (UPS) systems operating under highly nonlinear loads. The controller aims to overcome the limitations of the classical sinusoidal pulsewidth modulation (SPWM) controller which is not effective in compensating for harmonics and distortion caused by nonlinear currents from rectifier loads. The new design adds inner control loops that enable successful reduction of harmonics and compensation of distortion at the UPS outputs. Simulations and experimental results using a 10 kVA UPS system show the controller achieves steady-state voltage regulation and meets total harmonic distortion and dynamic response standards for UPS systems.
A Review of Matrix Converter and Novel Control Method of DC-AC Matrix Converteridescitation
For the past three decades, research work in matrix
converter has increased much. This paper presents a new
topology of DC-AC matrix converter, starting with a brief
historical review of different modulation and control strategies
which was developed recently. The purpose of the Paper is to
generate a multilevel output voltage equal to multilevel
inverter with reduced switches. An important part of the paper
is to design a dedicated DC-AC matrix converter and some
new arrays of bidirectional switches in a single module are
also presented. To find the performance of the module the
entire module is designed with MATLAB simulation and tested
with three phase induction motor.
A Review of Matrix Converter and Novel Control Method of DC-AC Matrix Converteridescitation
For the past three decades, research work in matrix
converter has increased much. This paper presents a new
topology of DC-AC matrix converter, starting with a brief
historical review of different modulation and control strategies
which was developed recently. The purpose of the Paper is to
generate a multilevel output voltage equal to multilevel
inverter with reduced switches. An important part of the paper
is to design a dedicated DC-AC matrix converter and some
new arrays of bidirectional switches in a single module are
also presented. To find the performance of the module the
entire module is designed with MATLAB simulation and tested
with three phase induction motor.
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...Asoka Technologies
It is known from the fact that Harmonic Distortion is one of the main power quality problems frequently encountered by the utilities. The harmonic problems in the power supply are caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. This paper presents an analysis and control methods for hybrid active power filter using Discrete Pulse Width Modulation and Space Vector Pulse Width Modulation (SVPWM) for Power Conditioning in distribution systems. The Discrete PWM has the function of voltage stability, and harmonic suppression. The reference current can be calculated by ‘d-q’ transformation. In SVPWM technique, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. The THD will be decreased significantly by SVPWM technique than the Discrete PWM technique based Hybrid filters. Simulations are carried out for the two approaches by using MATLAB, it is observed that the %THD has been improved from 1.79 to 1.61 by the SVPWM technique.
Average Phase-Leg Technique on Coupling Impedance Impact Modular Inverter Par...IJMTST Journal
The modular multilevel converter (MMC) is an emerging and highly attractive multilevel converter topology
for high-voltage and high-power applications. This paper proposes the control method of parallel-connected
modular multilevel converters (parallel-MMCs), which assumes that the multiple MMCs are directly connected
at both ac and dc sides to effectively enhance the power rating as expected. Two key problems were first
solved for the parallel-MMCs under the normal operation conditions: voltage balancing of sub modules and
mitigation of circulating currents, where the novel transformed third-order harmonic resonant controller in the
synchronous reference frame was employed to mitigate the dominant second-order and fourth-order
circulating currents and a sixth-order harmonic resonant controller is used to attenuate the zero-sequence
sixth-order circulating current existed in all phase currents per MMC. Considering the high risk of switches
fault in the parallel-MMCs, the fault-tolerant operation schemes were then proposed in this paper to address
the major concerns of open-circuit and short-circuit switch fault in a sub module, respectively. Carefully
controlling the healthy sub modules and the corresponding phase arms, the parallel-MMCs can successfully
maintain their balanced capacitor voltages and mitigate the circulating currents with the qualified output
waveform obtained. In addition, the parallel configuration of MMCs provides the unique solution for the
short-circuit switch fault operation which was seldom discussed in the published literature works with
respect to the MMC fault-tolerant operation schemes. MATLAB simulations and the constructed experimental
prototype have verified the performance of the proposed control strategy.
DSTATCOM IS USED IN DISTRIBUTION SYSTEM TO IMPROVE POWER QUALITY LIKE PF CORRECTION,VOLTAGE SAG OR SWELL,HARMONICS ELEMINATION,ETC.VARIOUS CONTROL STRATEGY COMPARISION FOR DSTATCOM.ADVANTAGES AND DISADVANTAGES OF DSTATCOM.APPLICATION OF STASTCOM IN INDIA.
ANALYSIS OF DISCRETE & SPACE VECTOR PWM CONTROLLED HYBRID ACTIVE FILTERS FOR ...Asoka Technologies
It is known from the fact that Harmonic Distortion is one of the main power quality problems frequently encountered by the utilities. The harmonic problems in the power supply are caused by the non-linear characteristic based loads. The presence of harmonics leads to transformer heating, electromagnetic interference and solid state device mal-functioning. Hence keeping in view of the above concern, research has been carried out to mitigate harmonics. This paper presents an analysis and control methods for hybrid active power filter using Discrete Pulse Width Modulation and Space Vector Pulse Width Modulation (SVPWM) for Power Conditioning in distribution systems. The Discrete PWM has the function of voltage stability, and harmonic suppression. The reference current can be calculated by ‘d-q’ transformation. In SVPWM technique, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. The THD will be decreased significantly by SVPWM technique than the Discrete PWM technique based Hybrid filters. Simulations are carried out for the two approaches by using MATLAB, it is observed that the %THD has been improved from 1.79 to 1.61 by the SVPWM technique.
Average Phase-Leg Technique on Coupling Impedance Impact Modular Inverter Par...IJMTST Journal
The modular multilevel converter (MMC) is an emerging and highly attractive multilevel converter topology
for high-voltage and high-power applications. This paper proposes the control method of parallel-connected
modular multilevel converters (parallel-MMCs), which assumes that the multiple MMCs are directly connected
at both ac and dc sides to effectively enhance the power rating as expected. Two key problems were first
solved for the parallel-MMCs under the normal operation conditions: voltage balancing of sub modules and
mitigation of circulating currents, where the novel transformed third-order harmonic resonant controller in the
synchronous reference frame was employed to mitigate the dominant second-order and fourth-order
circulating currents and a sixth-order harmonic resonant controller is used to attenuate the zero-sequence
sixth-order circulating current existed in all phase currents per MMC. Considering the high risk of switches
fault in the parallel-MMCs, the fault-tolerant operation schemes were then proposed in this paper to address
the major concerns of open-circuit and short-circuit switch fault in a sub module, respectively. Carefully
controlling the healthy sub modules and the corresponding phase arms, the parallel-MMCs can successfully
maintain their balanced capacitor voltages and mitigate the circulating currents with the qualified output
waveform obtained. In addition, the parallel configuration of MMCs provides the unique solution for the
short-circuit switch fault operation which was seldom discussed in the published literature works with
respect to the MMC fault-tolerant operation schemes. MATLAB simulations and the constructed experimental
prototype have verified the performance of the proposed control strategy.
DSTATCOM IS USED IN DISTRIBUTION SYSTEM TO IMPROVE POWER QUALITY LIKE PF CORRECTION,VOLTAGE SAG OR SWELL,HARMONICS ELEMINATION,ETC.VARIOUS CONTROL STRATEGY COMPARISION FOR DSTATCOM.ADVANTAGES AND DISADVANTAGES OF DSTATCOM.APPLICATION OF STASTCOM IN INDIA.
Enhancement of Power System Dynamics Using a Novel Series Compensation SchemeIJMER
Phase imbalanced capacitive compensation is a “hybrid” series compensation scheme, where the
series capacitive compensation in one phase is created using a single-phase TCSC in series with a fixed capacitor
(Cc), and the other two phases are compensated by fixed series capacitors (C). The TCSC control is initially set
such that its equivalent compensations at the power frequency combined with the fixed capacitor yield a
resultant compensation equal to the other two phases. Thus, the phase balance is maintained at the power
frequency while at any other frequency, a phase imbalance is created. The effectiveness of the scheme in damping
power system oscillations for various network conditions, namely different system faults and tie-line power flows is
evaluated using the MATLAB/SIMULINK Software
A Shunt Active Power Filter for 12 Pulse Converter Using Source Current Detec...IAES-IJPEDS
A shunt Active Power Filter (APF) with current detection at the source side
is considered as a closed-loop system from the view of the whole power
distribution system, which is expected with better harmonics filtering
performance compared with conventional current detection methods such as
load current detection and open loop control. This paper introduces an
efficient source current detection method (direct) control scheme to mitigate
the grid current harmonics generated by the twelve pulse converter. The
proposed system uses Control Rectifier (12 –pulse converter) which
efficiently regulates the DC voltage by varying the angle of each 6 pulse
converter. Moreover, the proposed system uses three winding transformer
which eliminates the harmonics during equal angles switching at each six
pulse converter which in turn simplifies the operation of the SAPF. The
proposed system is simulated in MATLAB SIMULINK to evaluate the
performance of the proposed system.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
To Study, Analysis and Implementation of Power Quality Improvement Using DSTA...ijtsrd
This project illustrates the execution of a three stage delivery static compensator DSTATCOM by using a back propagation BP control algorithm for its capacities, such as load balancing and zero voltage management of reactive power compensation under non linear loads. We use BP based control algorithm to obtain the critical dynamic weight estimate here. And the BP based control algorithm is often used for estimating the receptive power portions of the load streams necessary for estimating the reference source streams. Regulation of power efficiency devices through neural networks is the new area of study in the field of power engineering. The extraction of the harmonic components defines the output of the balancing instruments. Here we use DSTATCOM and UPFC as balancing instruments. A DSTATCOM model is developed using a computerized signal processor and its implementation is focused on various working conditions. The execution of DSTATCOM is found to be suitable for various kinds of burdens with the proposed control algorithm. The BP based control algorithm is used to derive the fundamental weighted value of the active and reactive power components of the load present. Back propagation algorithm trained by the sample will detect the power quality signal issue in real time. Continuity, differentiability, non decreasing momotomy are the key features of this algorithm. The process of UPFC is close to that of DSTATCOM, although the only difference is that it does not have the device shut down in worse circumstances. The simulation model is developed with ANFIS and its output is studied under different operating conditions. The output of ANFIS is found to be satisfactory with the proposed control algorithm for different types of loads. The suggested method shall be checked by the results of MATLAB Simulink. Rohit Mishra | Ashish Bhargava "To Study, Analysis and Implementation of Power Quality Improvement Using DSTATCOM with ANN (Back Propagation Algorithm)" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-6 , October 2021, URL: https://www.ijtsrd.com/papers/ijtsrd47521.pdf Paper URL : https://www.ijtsrd.com/engineering/electrical-engineering/47521/to-study-analysis-and-implementation-of-power-quality-improvement-using-dstatcom-with-ann-back-propagation-algorithm/rohit-mishra
Wide area monitoring systems (WAMS) are essentially based on the new data acquisition technology of phasor measurement and allow monitoring transmission system conditions over large areas in view of detecting and further counteracting grid instabilities.
Dual-Level Adaptive Supply Voltage System with Bandgap Reference MPR for Vari...IJERA Editor
Nowadays VLSI circuits have become much advanced by overcoming many challenges such as extra power
consumption, but circuit aging along with process variations are still challenging the advancements in power
efficient VLSI circuits. The aim of this dissertation is to propose the new adaptive technique to efficiently
compensate the fine grained variations by addressing the limitations in existing adaption approach. Adaptive
supply voltage (ASV) is proved to be one among the top most adaptation approaches in tuning of power
performance. Controlling power leakage is the main advantage in using ASV, while delivery overheads along
with voltage generation from conventional ASV systems make their application to mitigate fine-grained
variations demanding. The main aim of this dissertation is to present a dual level ASV system with band gap
reference Miniature programmable regulator (BGRMPR). Reference voltage independent of process and
temperature variations can be achieved because of using band gap reference voltage. Another advantage of
adapting this approach is because less power is consumed by system when compared to dual-level ASV system
with MPR.
Power quality improvement of grid interconnected distribution system using fs...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Similar to A high performance spwm controller for three-phase ups systems operating under highly nonlinear loads (20)
Bed side patients monitoring system with emergency alert
A high performance spwm controller for three-phase ups systems operating under highly nonlinear loads
1. A HIGH-PERFORMANCE SPWM CONTROLLER FOR THREE-PHASE
UPS SYSTEMS OPERATING UNDER HIGHLY NONLINEAR LOADS
ABSTRACT:
This paper presents the design of a high-performance sinusoidal pulsewidth modulation (SPWM)
controller for three-phase uninterruptible power supply (UPS) systems that are operating under highly
nonlinear loads. The classical SPWM method is quite effective in controlling the RMS magnitude of the
UPS output voltages. However, it is not good enough in compensating the harmonics and the distortion
caused specifically by the nonlinear currents drawn by the rectifier loads. The distortion becomes more
severe at high power where the switching frequency has to be reduced due to the efficiency concerns. This
study proposes a new design strategy that overcomes the limitations of the classical RMS control. It adds
inner loops to the closed-loop control system effectively that enables successful reduction of harmonics and
compensation of distortion at the outputs. Simulink is used to analyze, develop, and design the controller
using the state-space model of the inverter. The controller is implemented in the TMS320F2808 DSP by
Texas Instruments, and the performance is evaluated experimentally using a three-phase 10 kVA
transformer isolated UPS under all types of load conditions. In conclusion, the experimental results
demonstrate that the controller successfully achieves the steady-state RMS voltage regulation specifications
as well as the total harmonic distortion and the dynamic response requirements of major UPS standards.
