Decomposition of czarnecki's reactive current and reactive power

1991 ◽  
Vol 138 (3) ◽  
pp. 125 ◽  
Author(s):  
S.Q. Sun ◽  
C.G. Jiang
Keyword(s):  
Reactive Power ◽  
Reactive Current

The Design of Reactive Power Compensation System Based on SVG for Impact Load

2013 ◽  
Vol 846-847 ◽  
pp. 180-184
Author(s):  
Shu Xi Liu ◽  
Bo Wu ◽  
Shan Li
Keyword(s):  
Real Time ◽  
Closed Loop ◽  
Reactive Power ◽  
Impact Load ◽  
Closed Loop Control ◽  
Loop Control ◽  
Instantaneous Reactive Power Theory ◽  
Reactive Current ◽  
Motor Load ◽  
Iq Method

Aimed at the disadvantage of conventional ip-iq method based on instantaneous reactive power theory, a novel algorithm is presented in this paper. The detection of reactive current is obtained by voltage and current double closed-loop control based on ip-iq instantaneous value. The method is faced to impact load such as motor load increasing or decreasing suddenly. The good of using closed-loop is to make the load current follow the current issued by SVG in real time. That is to say the real-time following of reactive current is implemented. Simulation results verify the validity of the presented algorithm in the paper.

Power Factor Detection Methods Based on Atmega128

2013 ◽  
Vol 291-294 ◽  
pp. 2340-2345
Author(s):  
Zheng Rong Jiang ◽  
Dong Ming Ma
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Sampling Methods ◽  
Reactive Power Compensation ◽  
Active Power ◽  
Detection Methods ◽  
Load Power ◽  
Reactive Current ◽  
Avr Microcontroller ◽  
Detecting Method

There are three sampling methods for reactive power compensation controller, including active power factor detecting, reactive power detecting and reactive current detecting. This paper describes the power factor detecting, which use the avr microcontroller to detect load power factor, besides, the principles and characteristics of two different detection methods are presented, the detecting accuracy is compared between the same phase detecting method and using FFT algorithm.

The Simulation Research of Harmonic and Reactive Current Detection

2013 ◽  
Vol 373-375 ◽  
pp. 992-995
Author(s):  
Jun Li Wan ◽  
Wen Jie Chen
Keyword(s):  
Real Time ◽  
Reactive Power ◽  
Active Power Filter ◽  
Active Power ◽  
Harmonic Detection ◽  
Power Theory ◽  
Instantaneous Reactive Power Theory ◽  
Power Filter ◽  
Three Phase ◽  
Reactive Current

This paper arrives at a method of harmonic and reactive current real-time detection applied on active power filter based on the three-phase circuit instantaneous reactive power theory. With Matlab simulation software, a research on simulation of harmonic detection means is carried out, and an analysis of the simulation result is presented. The result indicates: the harmonic detection means based on instantaneous reactive power theory can detect harmonic and reactive component in three-phase current precisely and real-time, to supply reliable harmonic and reactive current for harmonic restraint and reactive power compensation. It could provide reliable indicator parameters for research and development of active power filter.

Study on Current Detecting and Control Method for STATCOM across Transformer

2011 ◽  
Vol 130-134 ◽  
pp. 1933-1937
Author(s):  
Cun Ping Wang ◽  
Xiang Gen Yin ◽  
Jian Liu ◽  
Qing Xiong
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Electronic Device ◽  
Control Strategies ◽  
Power Electronic ◽  
Output Current ◽  
Load Current ◽  
Decoupling Method ◽  
Reactive Current ◽  
And Control

Static var compensator (STATCOM) is a widely used power electronic device for dynamic reactive power compensation, and its current detecting and control method generally adopts d-q decoupling method based on the synchronous rotating coordinate transformation. However, in the traditional method, the load reactive current component is directly used as the command of STATCOM output current, so it is required that the installation position of STATCOM must be consistent with load current detecting point. But in practice, STATCOM installation point and load current detecting point may be located at two different sides of the transformer. For this situation, this paper proposed an improved reactive current detecting and control method based on the principle of power balance, achieving the current detecting and control strategies when the two points are located at different sides of transformer. Finally, the simulation of system with STATCOM accessed from the third winding of transformer verifies the correctness and feasibility of the proposed method.

Impact Analysis of Excitation System Reactive Current Compensation on the Stability of Sichuan Power Grid

2013 ◽  
Vol 805-806 ◽  
pp. 735-740
Author(s):  
Fan Tang ◽  
Li Jie Ding ◽  
Hua Zhang ◽  
Biao Wang
Keyword(s):  
Transient Stability ◽  
Impact Analysis ◽  
Reactive Power ◽  
Simulation Analysis ◽  
Power Grid ◽  
Heavy Load ◽  
Current Compensation ◽  
Reactive Current ◽  
The Stability ◽  
Damping Torque

Heffron-Philips model including excitation reactive current compensation (RCC) is set up, impact analysis of RCC on the stability of power system is carried out by theoretical analysis and time domain simulation. Analysis results show that positive RCC increases damping torque while reduces synchronous torque; negative compensation increases synchronizing torque while reduces damping torque, and this phenomenon is more obvious in heavy load. Combined with the actual situation in Sichuan power grid, the role of negative RCC to increase transient stability and provide dynamic reactive power for emergency HVDC power support is analyzed, also negative RCC's influence on the damping characteristics in Sichuan power grid is evaluated.

scholarly journals Design of Robust Current Controller for Two-Level 12-Pulse VSC-based STATCOM

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
M. Janaki ◽  
R. Thirumalaivasan ◽  
Nagesh Prabhu
Keyword(s):  
Power Control ◽  
Transient Response ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Transient Simulation ◽  
Voltage Source ◽  
Reactive Power Control ◽  
Typical Application ◽  
Current Controller ◽  
Reactive Current

The static synchronous compensator (STATCOM) is a shunt connected voltage source converter (VSC) based FACTS controller using GTOs employed for reactive power control. A typical application of a STATCOM is for voltage regulation at the midpoint of a long transmission line for the enhancement of power transfer capability and/or reactive power control at the load centre. The PI controller-based reactive current controller can cause oscillatory instability in inductive mode of operation of STATCOM and can be overcome by the nonlinear feedback controller. The transient response of the STATCOM depends on the controller parameters selected. This paper presents a systematic method for controller parameter optimization based on genetic algorithm (GA). The performance of the designed controller is evaluated by transient simulation. It is observed that the STATCOM with optimized controller parameters shows excellent transient response for the step change in the reactive current reference. While the eigenvalue analysis and controller design are based on D-Q model, the transient simulation is based on both D-Q and 3-phase models of STATCOM (which considers switching action of VSC).

An Applied Research on Reactive Current Detection Methods Based on Instantaneous Reactive Power Theory

2012 ◽  
Vol 433-440 ◽  
pp. 6212-6218
Author(s):  
Kang Lan
Keyword(s):  
Reactive Power ◽  
Stable State ◽  
Detection Methods ◽  
Dynamic State ◽  
Power Theory ◽  
Instantaneous Reactive Power Theory ◽  
Reactive Current ◽  
Instantaneous Reactive Power ◽  
Compensation Device ◽  
Current Detection

The reactive current detection methods in reactive power compensation device based on instantaneous reactive power theory were discussed in the paper. By analyzing the quality of various kinds of harmonious and reactive current detection methods in power system, and according to different compensation requirement, two reactive current detection methods ip-iq method and Hilbert method were adopted. Then it gives simulations on these two models to analyze their comprehensive performance of both stable state and dynamic state. Finally, gives a verification under a IC hardware platform.The result shows that these two methods can well inspected the three-phase reactive current, and then to complete the system compensation.

scholarly journals Reactive Power Control of Single-Stage Three-Phase Photovoltaic System during Grid Faults Using Recurrent Fuzzy Cerebellar Model Articulation Neural Network

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Faa-Jeng Lin ◽  
Kuang-Chin Lu ◽  
Hsuan-Yu Lee
Keyword(s):  
Neural Network ◽  
Power Control ◽  
Reactive Power ◽  
Single Stage ◽  
Pv System ◽  
Reactive Power Control ◽  
Active And Reactive Power ◽  
Three Phase ◽  
Control Scheme ◽  
Reactive Current

This study presents a new active and reactive power control scheme for a single-stage three-phase grid-connected photovoltaic (PV) system during grid faults. The presented PV system utilizes a single-stage three-phase current-controlled voltage-source inverter to achieve the maximum power point tracking (MPPT) control of the PV panel with the function of low voltage ride through (LVRT). Moreover, a formula based on positive sequence voltage for evaluating the percentage of voltage sag is derived to determine the ratio of the injected reactive current to satisfy the LVRT regulations. To reduce the risk of overcurrent during LVRT operation, a current limit is predefined for the injection of reactive current. Furthermore, the control of active and reactive power is designed using a two-dimensional recurrent fuzzy cerebellar model articulation neural network (2D-RFCMANN). In addition, the online learning laws of 2D-RFCMANN are derived according to gradient descent method with varied learning-rate coefficients for network parameters to assure the convergence of the tracking error. Finally, some experimental tests are realized to validate the effectiveness of the proposed control scheme.

scholarly journals Transitory Control Algorithm of Reactive Current for LSC of BDFIG Based Fuzzy Controller

2020 ◽  
Vol 9 (2S5) ◽  
pp. 28-34
Keyword(s):  
Reactive Power ◽  
Fuzzy Controller ◽  
Transient State ◽  
Current Control ◽  
Control Scheme ◽  
Control Schemes ◽  
Direct Current Control ◽  
Reactive Current ◽  
Point Of Common Coupling ◽  
Voltage Swell

The main aim of the paper is transitory mechanism process of the reactive current through the line-side converters of BDFIG based fuzzy controller. In individual process, the quality of voltage waveform on point of mutual connection would be intensely affected owing to responsive power alteration of load. The LSC could not work normally because of the PCC voltage is greater than voltage of DC-link. To mitigate this issues, various control schemes i.e., predictive direct voltage control and direct current control are generally established in machine_ adjacent converter to supply the reactive power. The line side converter could support in controlling the voltage at point of common coupling variations through providing or observing reactive current. This proposed paper examines load transient state and voltage of PCC is quickly joined to the stator PW. Formerly the LSC controllability throughout the voltage swell of PCC is studied when load is separated commencing the stator PW. In this paper a High HVRT control scheme with fuzzy controller is suggested through utilizing the LSC reactive current. The simulation results of proposed method is verified by MATLAB/SIMULINK environment.

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