scholarly journals Control Strategy for Electric Vehicle Charging Station Power Converters with Active Functions

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3971 ◽  
Author(s):  
Fermín Barrero-González ◽  
María Isabel Milanés-Montero ◽  
Eva González-Romera ◽  
Enrique Romero-Cadaval ◽  
Carlos Roncero-Clemente
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Reactive Power ◽  
Power Electronic ◽  
Charging Station ◽  
Electric Vehicle Charging ◽  
Battery Chargers ◽  
Three Phase ◽  
Facility Level

Based on the assumption that vehicles served by petrol stations will be replaced by Electric Vehicles (EV) in the future, EV public charging station facilities, with off-board fast chargers, will be progressively built. The power demand of these installations is expected to cause great impact on the grid, not only in terms of peak power demanded but also in terms of power quality, because most battery chargers behave as non-linear loads. This paper presents the proposal of a novel comprehensive global control strategy for the power electronic converters associated with bidirectional three-phase EV off-board fast chargers. The Charging Station facility Energy Management System (CS-EMS) sends to each individual fast charger the active and reactive power setpoints. Besides, in case the charger has available capacity, it is assigned to compensate a fraction of the harmonic current demanded by other loads at the charging facility. The proposed approach works well under distorted and unbalanced grid voltages. Its implementation results in improvement in the power quality of each fast charger, which contributes to improvement in the power quality at the charging station facility level, which can even provide ancillary services to the distribution network. Simulation tests are conducted, using a 100 kW power electronic converter model, under different load and grid conditions, to validate the effectiveness and the applicability of the proposed control strategy.

scholarly journals Research on Transient Power Quality of Large-capacity Electric Arc Furnace

2021 ◽  
Author(s):  
Liu Yang ◽  
Qinyue Tan ◽  
Di Xiong ◽  
Zhengguang Liu
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Short Circuit ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Normal Operation ◽  
Arc Furnace ◽  
Three Phase ◽  
Transient Power Quality

The overrun of transient power quality index caused by the large-capacity electric arc furnace (EAF) has become a prominent problem affecting the safe and stable operation of the power system. (1) In this paper, the relationship between arc furnace volt-age and current is derived based on the different stages of arc combustion, and the random variation of chaotic phenomenon of the arc voltage are simulated. Established an EAF model suitable for the study of transient power quality problems. (2) Take 50t AC EAF as an example to analyze the reactive power impact and the influence on the point of common coupling (PCC) voltage caused by the three-phase short circuit of the electrode. The results show that the experimental results are consistent with the theoretical analysis, verifying the correctness and effectiveness of the model. (3) When the three-phase short-circuit occurs, the reactive power impact is nearly 6 times that of normal operation, the short-circuit current is 2.66 times that of normal operation, and the effective value of the PCC voltage has dropped by 40.37%, which provides a theoretical basis for real-time compensation of impulsive reactive power and improvement of the transient power quality of the EAF.

Harmonic Reduction in Grid Connected Wind Energy System with Dynamic Voltage Restorer Using Fuzzy Logic Technique

2014 ◽  
Vol 626 ◽  
pp. 197-201
Author(s):  
B. Ashok Kumar ◽  
N. Kamaraj ◽  
C.K. Subasri
Keyword(s):  
Fuzzy Logic ◽  
Wind Energy ◽  
Power Quality ◽  
Reactive Power ◽  
Energy System ◽  
Conventional Technique ◽  
Superior Performance ◽  
Power Electronic ◽  
Fuzzy Logic Technique

Grid connected Wind energy conversion system uses power Electronic converters hardly in fixed speed systems except for reactive power compensation. This Power Electronic converter causes major electrical losses and affects power quality of the system. The quality of the voltage and current is also affected by sensitive loads which are used widely in most of Automated Industries and Research laboratories. Disturbances in waveforms occurs which results in harmonics. To improve such power quality problem of the system DVR which is based on fuzzy logic technique is introduced. The system is tested for conventional technique and also with fuzzy logic. The performance is investigated through MATLAB/SIMULINK software. The simulation results confirm the superior performance of the proposed DVR based fuzzy logic technique than conventional technique. The proposed system reduces harmonics as well as mitigates voltage sag/swell.

scholarly journals Fault Clearance in Nine-Bus system using Custom Power Devices

2020 ◽  
Vol 9 (2) ◽  
pp. 1756-1762 ◽  
Keyword(s):  
Power System ◽  
Power Quality ◽  
Reactive Power ◽  
Vital Role ◽  
Machine System ◽  
Facts Devices ◽  
Three Phase ◽  
Compensating Devices ◽  
Fault Clearance

The power transfer capability of a system determines the power quality and the reliability of the power system. The transmission side of the power system is of different configuration. This paper involves the modeling of a three-phase multi-machine system with nine bus configurations. The system is subjected to different fault conditions. The system is modeled with the help of MATLAB- Simulink. The power quality of the system is analyzed. The system active and the reactive power can be compensated by the FACTS devices. The FACTS devices are power compensating devices that play a vital role in increasing the power quality of the system. The three-phase multi-machine system is integrated with the FACTS devices like STATCOM and UPFC and different parameters where analyzed

Research on Harmonic Elimination of Electric Vehicle Charging Station Based on APF

2013 ◽  
Vol 380-384 ◽  
pp. 3392-3395 ◽  
Author(s):  
Guan Qi Liu ◽  
Ting Hu ◽  
Li Na Wu
Keyword(s):  
Smart Grid ◽  
Electric Vehicle ◽  
Power Quality ◽  
Harmonic Generation ◽  
High Frequency ◽  
Power Electronic ◽  
Charging Station ◽  
Electric Vehicle Charging ◽  
Harmonic Elimination ◽  
Vehicle Charging

Electric vehicle is an important part of the smart grid. However, when electric vehicle charging station which is with massive application of the power electronic equipments connects to the grid, it will make a lot of power quality problems, especially the harmonic problems. This paper analyses the mechanism of harmonic generation caused by high-frequency charger, proposes to use APF to deal with power quality problems , and verifies the viability and effectiveness.

scholarly journals Effective Renewable Source Integration using Unified Power Quality Conditioner with Power Quality Enhancement in Three Phase System

2018 ◽  
Vol 225 ◽  
pp. 05014 ◽  
Author(s):  
P. Suresh ◽  
T. Gowri Manohar
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Reactive Power ◽  
Phase System ◽  
Nonlinear Loads ◽  
Renewable Source ◽  
Active Power Filters ◽  
Unified Power Quality Conditioner ◽  
Three Phase ◽  
Power Quality Conditioner

This paper proposes a modified control strategy for unified Power Quality conditioner to alleviate voltage and current abnormalities in three phase system. Renewable source integration and nonlinear loads depreciates Power Quality of the system. Active Power Filters play a paramount role in alleviating PQ disturbances. To deal with current imperfections and reactive power compensation, modified dq controller is proposed for shunt controller. ANFIS-dq control strategy is proposed for Series Controller to suppress voltage imperfections Photovoltaic unit is optimally connected at DC link of UPQC for supporting controlling action and to deliver real power Proposed optimal renewable source integrated UPQC performance is studied with traditional PI and ANFIS controller. MATLAB / SIMULINK platform is used for analyzing proposed system performance.

Research on Detection and Control Strategy for UPQC without PLL in Coal Mine

2013 ◽  
Vol 448-453 ◽  
pp. 3942-3946
Author(s):  
Yan Wen Wang ◽  
Yan Hua Jiang
Keyword(s):  
Power Quality ◽  
Coal Mine ◽  
Control Strategy ◽  
Control Method ◽  
Positive Sequence ◽  
Three Phase ◽  
Park Transformation ◽  
And Control ◽  
Quality Controller

To improve the power quality of power grid in coal mine, a kind of detection and control method for unified power quality controller (UPQC) without phase locked loop (PLL) is put forward. It can get the positive-sequence component of unity fundamental voltage through Park transformation,and then obtains the positive-sequence active component of fundamental current after proper operation . The PLL or filtering of three-phase voltage and the synchronous coordinates transformation for current are cancelled. The control strategy of the system is studied and the effectiveness and validity of UPQC are verified by simulation results.

scholarly journals Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1718 ◽  
Author(s):  
Radek Martinek ◽  
Petr Bilik ◽  
Jan Baros ◽  
Jindrich Brablik ◽  
Radana Kahankova ◽  
...  
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Active Power ◽  
Current Control ◽  
Measuring System ◽  
Street Lighting ◽  
Active Power Filters ◽  
Power Filters ◽  
Three Phase

This study focuses on the design of a measuring system for monitoring the power quality within the SMART street lighting test polygon at university campuses with relation to testing an adaptive current control strategy for three-phase shunt active power filters. Unlike conventional street lighting, SMART elements are powered 24/7. Due to the electronic character of the power part of such mass appliances, there are increased problems with the power quality of the electric energy. Compared to the current concept of street lighting, there is a significant increase in the content of higher current harmonic components, which cause several problems in the distribution system. The test polygon contains 16 luminaires made by various manufacturers and mounted with various SMART components. Using the polygon control and monitoring system, dynamic load scenarios were selected. These scenarios tested the possibilities of different adaptive current control strategies for three-phase shunt active power filters to improve the power quality of electricity. This study focuses on three adaptive algorithms that respond to dynamic changes of current harmonics level in real-time. The possibility of active filter control was tested using FPGA, mainly due to the low latency of the filter control part.

scholarly journals Control Strategy of Thyristors Switched SVCs with High Power Quality

2018 ◽  
Vol 3 (1) ◽  
pp. 15 ◽  
Author(s):  
Dmitry Ivanovich Panfilov ◽  
Ahmed ElGebaly ◽  
Alexander Nikolaevich Rozhkov ◽  
Michael Astashev
Keyword(s):  
Power Quality ◽  
High Power ◽  
Control Strategy ◽  
Reactive Power ◽  
Block Diagram ◽  
System Quality ◽  
Transient Effects ◽  
Static Var Compensators ◽  
Switching Strategies

In this paper, new static VAR compensators SVCs schemes for inductive and capacitive reactive power are developed. The provided schemes improve the flexibility and power system quality of SVCs by developing new circuit topologies with new control strategy of the reactive power. New circuit schemes are introduced for thyristors switched reactors TSR and thyristors switched capacitors TSC to design harmonic-free SVC with higher discrete number of reactive power levels. This paper provides the control algorithm and block diagram of the new SVCs schemes. The switching strategies of TSR and TSC are described and implemented. The new scheme of TSC requires special modifications to decrease transient effects and implementation of specific switching strategies to acquire SVC with high power quality indexes.

scholarly journals An Optimal Control Algorithm with Reduced DC-Bus Current Fluctuation for Multiple Charging Modes of Electric Vehicle Charging Station

2021 ◽  
Vol 12 (3) ◽  
pp. 107
Author(s):  
Tao Chen ◽  
Peng Fu ◽  
Xiaojiao Chen ◽  
Sheng Dou ◽  
Liansheng Huang ◽  
...  
Keyword(s):  
Electric Vehicle ◽  
Electric Vehicles ◽  
Control Algorithm ◽  
Current Fluctuation ◽  
Charging Station ◽  
Electric Vehicle Charging ◽  
Three Phase ◽  
Optimization Control ◽  
Dc Bus ◽  
Vehicle Charging

This paper presents a systematic structure and a control strategy for the electric vehicle charging station. The system uses a three-phase three-level neutral point clamped (NPC) rectifier to drive multiple three-phase three-level NPC converters to provide electric energy for electric vehicles. This topology can realize the single-phase AC mode, three-phase AC mode, and DC mode by adding some switches to meet different charging requirements. In the case of multiple electric vehicles charging simultaneously, a system optimization control algorithm is adopted to minimize DC-bus current fluctuation by analyzing and reconstructing the DC-bus current in various charging modes. This algorithm uses the genetic algorithm (ga) as the core of computing and reduces the number of change parameter variables within a limited range. The DC-bus current fluctuation is still minimal. The charging station system structure and the proposed system-level optimization control algorithm can improve the DC-side current stability through model calculation and simulation verification.

Sign in / Sign up

Export Citation Format

Share Document