Study on Driving Point Power Flow as Power Dissipation in Discrete Vibratory Systems

2015 ◽  
Author(s):  
Akira Inoue ◽  
Yosuke Tanabe
Keyword(s):  
Power Dissipation ◽  
Power Flow ◽  
Reactive Power ◽  
Active Power ◽  
Response Functions ◽  
Exact Methods ◽  
Indirect Methods ◽  
Force Moment ◽  
Complex Valued ◽  
Interfacial Force

Mechanical power flow into a discrete system is formulated as power dissipation in the system using driving point advantages. Firstly, the complex-valued power flow into a system is defined, and it is shown that the real part (or active power) corresponds to the power dissipation, and the imaginary part (or reactive power) contains the Lagrangian energy. To represent the power dissipation in the system, all the power flows into the system must be counted. Otherwise, the value of power flow may become negative, and its physical interpretation may be troublesome. One of the main advantages of the formulated power flow is that to estimate the power dissipation in the system, only the power flows into the system are necessary. In other words, only the driving point power flows into the system are needed, and no information inside the system is required. Next, to estimate interfacial force/moment for the power flow into a sub-system, the two alternative indirect methods are presented. It is shown that these are exact methods utilizing the responses and the frequency response functions at the driving points only. This is another remarkable characteristic of the driving point. A 7 degree-of-freedom system is employed as an example case, and the presented formulations are confirmed computationally.

Research of Improved On-Line Power Flow Method

2014 ◽  
Vol 986-987 ◽  
pp. 1651-1654
Author(s):  
Hai Bao ◽  
Ling Wang ◽  
Yu Long Chen
Keyword(s):  
Convergence Rate ◽  
Power Flow ◽  
Measurement Accuracy ◽  
Reactive Power ◽  
Active Power ◽  
Flow Method ◽  
Calculation Results ◽  
On Line ◽  
Power Flow Method

Based on measurement accuracy of reactive power lower than the accuracy of active power and voltage magnitude, this paper proposes an improved on-line power flow method. Through simulation, compared with the conventional power flow, this method improves the accuracy of the calculation results and also has obvious advantages on the convergence rate. Finally, the article analyzes the reasons for this situation.

Active Power Optimization Considering both Generation Cost and Network Loss

2014 ◽  
Vol 556-562 ◽  
pp. 1643-1646
Author(s):  
Xue Fei Chang ◽  
Xiang Yu Lv ◽  
De Xin Li
Keyword(s):  
Power Flow ◽  
Optimal Power Flow ◽  
Reactive Power ◽  
Test System ◽  
Weighting Factor ◽  
Active Power ◽  
Model Combining ◽  
Proposed Model ◽  
Generation Cost ◽  
Objective Model

In order to improve the calculation efficiency, active power and reactive power are usually optimized separately in optimal power flow considering the decoupling characteristic. However, this would decrease the economy performance of power system. This paper proposed a weighting factor to formulate a multi-objective model, combining the generation cost and system network loss together. The optimization problem is performed using genetic algorithms and quadratic programming respectively. Finally, the feasibility and efficiency of the proposed model are verified with the IEEE 14 Bus test system.

scholarly journals Interphase Power Flow Control via Single-Phase Elements in Distribution Systems

2021 ◽  
Vol 3 (1) ◽  
pp. 37-58
Author(s):  
Piyapath Siratarnsophon ◽  
Vinicius C. Cunha ◽  
Nicholas G. Barry ◽  
Surya Santoso
Keyword(s):  
Power Consumption ◽  
Power Systems ◽  
Power Flow ◽  
Distribution Systems ◽  
Single Phase ◽  
Reactive Power ◽  
Active Power ◽  
Real Power ◽  
Power Flow Control ◽  
Reactive Power Flow

The capability of routing power from one phase to another, interphase power flow (IPPF) control, has the potential to improve power systems efficiency, stability, and operation. To date, existing works on IPPF control focus on unbalanced compensation using three-phase devices. An IPPF model is proposed for capturing the general power flow caused by single-phase elements. The model reveals that the presence of a power quantity in line-to-line single-phase elements causes an IPPF of the opposite quantity; line-to-line reactive power consumption causes real power flow from leading to lagging phase while real power consumption causes reactive power flow from lagging to leading phase. Based on the model, the IPPF control is proposed for line-to-line single-phase power electronic interfaces and static var compensators (SVCs). In addition, the control is also applicable for the line-to-neutral single-phase elements connected at the wye side of delta-wye transformers. Two simulations on a multimicrogrid system and a utility feeder are provided for verification and demonstration. The application of IPPF control allows single-phase elements to route active power between phases, improving system operation and flexibility. A simple IPPF control for active power balancing at the feeder head shows reductions in both voltage unbalances and system losses.

scholarly journals PHOTOVOLTAIC BASED BALANCING LOAD DISTRIBUTION FEEDERS USING LOOP POWER CONTROLLERS

2014 ◽  
pp. 105-111
Author(s):  
E. VENKATESH ◽  
S.SIVA PRASAD
Keyword(s):  
Phase Shift ◽  
Load Distribution ◽  
Power Loss ◽  
Power Flow ◽  
Reactive Power ◽  
Active Power ◽  
Power Controller ◽  
Voltage Ratio ◽  
Power Loading ◽  
Set Up

Balancing load of distribution feeders is significant for falling of power loss and mitigating power flow. As the loop power controller is implanting for the active power and reactive power flows by change in voltage ratio and phase shift. So that the balancing of the load distribution feeders can be achieved. However it can include photovoltaic power producing in feeder balancing load, as a Taipower distribution feeder consisting of two feeders with large amount of photovoltaic equipment considered. The balancing load can be determine in distribution feeders with photovoltaic set up by using the loop power controllers as the changing of solar energy and power loading of feeders. With implanting the control algorithm in MATLAB for loop power controller by changing the voltage ratio and phase shift connecting to the feeder the proper amount of active power and reactive power can be change from the heavily loading feeder to the lightly loading feeder. When system power loss decreases, Photovoltaic balancing the load for loop power controller has been investigated.

scholarly journals MATLAB SIMULATION OF D-STATCOM USING SVPWM

2020 ◽  
Vol 5 (5) ◽  
pp. 184-195
Author(s):  
Adeesh Sharma ◽  
Himmat Singh
Keyword(s):  
Power Factor ◽  
Distribution System ◽  
Power Flow ◽  
Reactive Power ◽  
Active Power ◽  
Static Synchronous Compensator ◽  
Power Flow Control ◽  
Control Power ◽  
Active Power Flow ◽  
Distribution Line

In this paper, A Distribution Static Synchronous Compensator (D-STATCOM) is used for improving the power factor, power quality and to control power flow control in the distribution line. It used to give reactive and active power compensation in the distribution line. The power depends on the power factor of the loads connected to the transmission line. In this paper we have used a new DSTATCOM using modified SVPWM technique. The previous DSTATCOM are basically controlled by PWM, or SPWM technique which produce high harmonics distortion but using SVPWM technique distortion reduces to maximum possible level. In our system we also have examined the losses due to DSTATCOM when connected in the distribution system. To decrease the reactive power and to minimize the undesirable load to require maintains the flow of reactive power. As a result, the power a factor of the load descant, leading to the limitation of the active power flow in the line. The D-STATCOM is a power electronics based on advanced device can be used to control power flow in the distribution line. The construction of system is able to recover the drop-in bus voltage when any loading effect arises, but due to 5th harmonic performance of DSTATCOM reduces somewhere.

scholarly journals Control Method of Four Wire Active Power Filter Based on Three-Phase Neutral Point Clamped T-Type Converter

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8427
Author(s):  
Dawid Buła ◽  
Grzegorz Jarek ◽  
Jarosław Michalak ◽  
Marcin Zygmanowski
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Neutral Point ◽  
Laboratory System ◽  
Power Filter ◽  
Input Filter ◽  
Three Phase

An active power filter based on a three-level neutral point clamped T-type converter with LCL input filter is presented in the paper. The main goal of the paper is the analysis of a control system that ensures independent control of a current in each phase. The presented control method of the filter allows reactive power compensation and/or a higher harmonics reduction to be achieved in each phase independently, with the possibility of control tan (φ) coefficient. This allows the power flow between the phases to be minimalized and reduces the RMS values of filter currents without the need to balance grid currents. The analysis presents the possibility of an operation in different modes, which was verified by experimental results. The results have been obtained in a 20 ARMS laboratory system described in the paper. The results reveal relatively low power losses, which are a feature of the selected three-level T-type topology. Additionally, that topology, when compared to a two-level one, ensures the reduction in current ripples with the same parameters of passive components.

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