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A new topology of the distributed power flow controller and its electromagnetic transient characteristics

ELECTRIC power SYSTEMS RESEARCH 2018年 163卷 280-287页

作者： Tang, Aihong Shao, Yunlu Huang, Yong Xu, Qiushi Wuhan Univ Technol Sch Automat Wuhan 430070 Hubei Peoples R China State Grid Hubei Econ & Technol Res Inst Wuhan 430077 Hubei Peoples R China

In this paper, the modular multilevel converter (MMC) is introduced into the shunt side of the distributed power flow controller (DPFC), and a new topology of distributed power flow controller is constructed. The mathematical models are developed, in these models the internal energy relationship between the MMC module and the single-phase converter in the shunt side, as well as between the shunt-side single-phase converter and series side single-phase converter are considered, and the corresponding control strategies are proposed based on the mathematical models. The internal electromagnetic transient characteristics of the MMC based DPFC are studied in PSCAD/EMTDC. The simulation results show that the MMC based DPFC is able to adjust the control variables such as voltage amplitude, phase angle and line reactance of the power system individually or simultaneously, and also the DPFC is able to respond to the power flow regulation demand effectively.

关键词： Modular multilevel converter distributed power flow controller 3rd harmonic current Mathematical model Control strategy Internal electromagnetic transient characteristics

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Design and Performance Analysis of WSCC System Using Modified Grey Wolf Optimization for Optimal power Quality Enhancement

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ELECTRIC power COMPONENTS AND SYSTEMS 2023年第8期52卷 1448-1458页

作者： Dineshkumar, T. Thirumoorthi, P. Kumaraguru Coll Technol Dept Elect & Elect Engn Coimbatore Tamil Nadu India Er Perumal Manimekalai Coll Engn Dept Elect & Elect Engn Hosur India

At present, the usage of various energy sources in the electricity grid has formed new challenges like power quality effectiveness, energy utilization, and voltage stabilization. With the recognition of smart grid, the maintenance of power quality (PQ) has been regarded as the challenging one. Primarily, APF are employed in an attempt to recompense the issues associated with power quality, as they can filter out promptly and responds vibrantly. Here, in this work, an IEEE 9 Bus System based on WSCC is introduced along with UPQC combined DPFC system. To accommodate a renewable energy source, one of the generators test system. MGWO approach-based PID device is combined with DC Source as a converter for 3-phase inverter. This arrangement is studied using Simulation in both cases with and without DPFC. In addition, the performance estimation is done in terms of parameters like load voltage and current, shunt voltage and series current, and grid current along with their THD values. Based on the outcome, it is found that the proposed UPQC-DPFC combination helps in effective harmonic elimination and increased power storage at the output side.

关键词： power factor western systems coordinating council modified grey wolf optimization technique UPQC distributed power flow controller THD

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The Optimization of distributed power flow Fuzzy Pi controller

The Optimization of Distributed Power Flow Fuzzy Pi Controll...

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作者： Xiaoyu Fei Aihong Tang Qiushi Xu Hongsheng Zhao Shuyuan Zhang College of Automation Wuhan University of Technology Economic Research Institute of State Grid Hubei Electric Power Co.Ltd. Wuhan Zhongyuan Electronic Information Co.Ltd.

distributed power flow controller(DPFC) is one of the most powerful and economical devices in flexible AC transmission system. It has the ability to adjust the reactance, voltage, power and other structural parameters and operation parameters of power system simultaneously or independently. It can improve the transmission capacity of power grid and enhance the stability of power system. The network has broad application prospects. In this paper, based on the theory of fuzzy control, the fuzzy PI control is applied to optimize the design of distributed power flow controller. Firstly, the structure and principle of DPFC are analyzed;secondly, the fuzzy PI parameters are designed by using the fuzzy control theory;finally, the simulation results are verified by using power System Analysis Software Package(PSASP). The results show that the fuzzy PI control can effectively improve the speed and scope of DPFC power flow control.

关键词： distributed power flow controller Fuzzy PI Controll Optimization

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Research on Flexible Mutual Aid Capacity Configuration Model Between Area power Grids 6

Research on Flexible Mutual Aid Capacity Configuration Model...

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6th International Conference on Electrical Engineering and Control Technologies, CEECT 2024

作者： Guo, Guowei Zhan, Ximei Ye, Chengyuan Li, Fushen Xie, Changlin Xiang, Caili Foshan Power Supply Bureau of Guangdong Power Grid Co. Ltd. Guangdong Foshan China Wuhan University of Technology School of Automation Hubei Wuhan China

ISBN: (纸本)9798331528096

Due to the different distribution levels of power supply structure, load composition and new energy resources in different area power grids, there is a non-negligible mutual aid potential between cross-area interconnected power grids, which requires that the power flow on the cross-area power grid connection line can be controlled. The flexibility and power flow regulation characteristics of distributed power flow controller make it have great advantages in realizing flexible interconnection of cross-area power grids. This paper briefly introduces the device structure and mutual aid principle of DPFC, analyzes the potential of flexible mutual aid between area power grids, and studies the impact of flexible interconnection on the operation economy and reliability of interconnected systems. Based on these two indicators, an evaluation method of flexible mutual aid capacity between area power grids is proposed. Utilizing PSCAD/EMTDC software, we've developed a simulated model for a 110 kV standard system, incorporating three units of DPFC sub-modules. The outcomes of the simulation indicate that our novel assessment technique effectively harmonizes economic efficiency with operational reliability. © 2024 IEEE.

关键词： area grid distributed power flow controller flexible mutual aid mutual economic capacity allocation

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Maximization of injected power and efficiency based optimal location of DPFC using iterative procedure

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ARCHIVES OF ELECTRICAL ENGINEERING 2022年第1期71卷 91-108页

作者： Gupta, Santosh Kumar Tripathi, Jayant Mani Ranjan, Mrinal Gupta, Ravi Kumar Kumar, Dheeraj Sitamarhi Inst Technol Sitamarhi 843301 Bihar India Rajkiya Engn Coll Mainpuri Mainpuri 205001 Uttar Pradesh India Gaya Coll Engn Gaya 823003 Bihar India Madan Mohan Malaviya Univ Technol Gorakhpur 273008 Uttar Pradesh India Shri Ramwaroop Mem Coll Engn & Management Lucknow Uttar Pradesh India

Among the FACTS device, the distributed power flow controller (DPFC) is a superior device. This can be evaluated after eliminating the dc capacitor between shunt and series convertors of the unified power flow controller (UPFC) and placing a number of low rating single phase type distributed series convertors in the line instant of using single large rating three phase series convertors as in the UPFC. The power flow through this dc capacitor as in the UPFC now takes place through the transmission line at a third harmonic frequency in the DPFC. The DPFC uses the D-FACTS that allows the replacement of a large three-phase converter as in the UPFC by several small-size series convertors present in the DPFC. The redundancy of several series convertors increases the system's reliability of the power system. Also, there is no requirement for high voltage isolation as series convertors of the DPFC are hanging as well as single-phase types. Consequently, the DPFC system has a lower cost than the UPFC system. In this paper, the equivalent ABCD parameters of the latest FACTS device DPFC have been formulated with the help of an equivalent circuit model of the DPFC at the fundamental frequency component. Further, the optimal location in the transmission line and maximum efficiency of the DPFC along with Thyristor Controlled Series Compensator (TCSC), Static Synchronous Shunt Compensator (STATCOM) and UPFC FACTS devices have been investigated using an iteration program developed in MATLAB under steady-state conditions. The results obtained depict that the DPFC when placed slightly off-center at 0.33 fraction distance from the sending end comes up with higher performance. Whereas, when the TCSC, STATCOM and UPFC are placed at 0.16, 0.2815, 0.32 fraction distances from sending end respectively give their best performance

关键词： distributed power flow controller efficiency FACTS maximum power transfer capability optimal location

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Robust Unit Commitment for Minimizing Wind Spillage and Load Shedding With Optimal DPFC

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Zhu, Xuedong Wu, Jun Liu, Dichen Wuhan Univ Sch Elect Engn & Automat Wuhan Peoples R China

The distributed power flow controller (DPFC) has a positive effect of UC problem on the network side based on its ability to manage capacity of power flow. This study presents a novel two-stage robust model to optimize the status of the generator and location-allocation of the DPFC, while simultaneously considering wind and load uncertainties. The column-and-constraint generation (CCG) method is utilized to solve the two-stage problem into the master problem and the subproblem iteratively. The optimal status of the generator and location of the DPFC can be easily obtained with the master problem, and the dispatch solution and compensation level of the DPFC are solved in the subproblem. We conduct the IEEE 24 bus system to verify the performance of the proposed procedure. There are effects on wind spillage/load shedding and generator dispatch scheduling planning once the DPFC is injected. Detailed simulation results illustrate the effect of the proposed approach.

关键词： column-and-constraint generation (CCG) algorithm optimal FACTS planning distributed power flow controller relaxed AC-SOCP2 robust optimization

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Research on the output coordinated strategy of a DPFC considering device fault probability

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Chen, Xiaogang Tang, Aihong Xiong, Binyu Zhou, Wei State Grid Zhejiang Elect Power Co Ltd Hangzhou Peoples R China Wuhan Univ Technol Automation Sch Wuhan Peoples R China

A distributed power flow controller (DPFC) can control the line power flow in a flexible and fast way to meet the requirements of a new power system. However, the output of DPFC sub-units is generally distributed by the even distribution method or proportional distribution method at present. The internal health status and output capacity of the device are not taken into account, which affects the efficiency and service life of the device. In this article, a reliability description method of DPFC based on fault probability is proposed. The coordination strategy of output voltage capability and the number of input sub-units is proposed, and the process of the proposed coordinated strategy for device output is presented. The simulation results show that the proposed coordinated output strategy can address the issue of rapid reliability decline caused by the long-term work of some sub-units and improve the overall reliability of the DPFC.

关键词： power systems distributed power flow controller fault probability output voltage capability number of switching sub-units

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Two-Stage Optimal Location Allocations of DPFC Considering Wind and Load Uncertainty

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Zhu, Xuedong Liu Dichen Wu, Jun Wuhan Univ Sch Elect Engn & Automat Wuhan Peoples R China

distributed power flow controller (DPFC) has a considerable potential to regulate the power flow and generator rescheduling continuously. This study presents a novel two-stage stochastic model for optimal location allocations of the DPFC coupled with the interactions of DPFC to search for the optimal solutions. The Benders decomposition is utilized to reformulate the two-stage problem into the master problem and the subproblem. The optimal solution can be easily obtained with the master problem and subproblem iteratively. The relaxed DC power flow with a DPFC in the master problem accelerates the efficiency of optimal locations under a base condition. Slack variables are incorporated in the subproblem to check the feasibility of relaxed AC power flow. The optimal compensation levels of DPFC at different load/wind scenarios are optimized in the subproblem. The IEEE 118 bus system is conducted to verify the performance of the proposed procedure. The DPFC has positive impacts on unit costs, voltage performance, wind absorption, and power losses. Detailed simulation results illustrate the effect of the proposed approach.

关键词： distributed power flow controller relaxed AC-SOCP Benders decomposition uncertainty optimal FACTS

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Design and simulation of resistive type SFCL in multi-area power system for enhancing the transient stability

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PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 2020年 573卷

作者： Peddakapu, K. Mohamed, M. R. Sulaiman, M. H. Srinivasarao, P. Reddy, S. Rajasekhar Univ Malaysia Pahang Fac Elect & Elect Engn Pekan Malaysia Nalanda Inst Engn & Tech Dept Elect & Elect Engn Guntur AP India SRKR Engn Coll Dept Elect & Elect Engn Bhimavaram AP India

This paper presents a novel approach in two-area interconnected power system for enriching the transient stability at perturbations. The challenging task in the interconnected system is to equalize the power production and load demand without changing the system parameters. Therefore, a sophisticated controller of flexible alternating current transmission system (FACTS) called distributed power flow controller (DPFC) is suggested to the two-area power system for enhancing the system stability. Furthermore, the resistive type superconducting fault current limiter (SFCL) is also suggested to employ with DPFC for alleviating the fault current, and power quality issues. In this work, three cases are investigated by using without auxiliary, SFCL, unified power flow controller (UPFC), SFCL-UPFC, and SFCL-DPFC on two-area multi-machine system. The objectives of the paper are to determine and evaluate the fault current, variations in voltage and inter-area oscillations, ascertain the performance of suggested techniques at diverse fault-clearance times, and find out the finest control method for different kinds of faults. The simulation outcomes disclose that the coordination of SFCL and DPFC yielded finer outcomes over other control approaches.

关键词： Multi-machine system Transient stability Resistive type superconducting fault current limiter Fault Current distributed power flow controller Inter-Area Oscillations

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Multi-Time Scale Coordinated Scheduling Strategy with distributed power flow controllers for Minimizing Wind power Spillage

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ENERGIES 2017年第11期10卷

作者： Tang, Yi Liu, Yuqian Ning, Jia Zhao, Jingbo Southeast Univ Jiangsu Prov Key Lab Smart Grid Technol & Equipme Nanjing 210096 Jiangsu Peoples R China Jiangsu Elect Power Co Res Inst Nanjing 211103 Jiangsu Peoples R China

The inherent variability and randomness of large-scale wind power integration have brought great challenges to power flow control and dispatch. The distributed power flow controller (DPFC) has the higher flexibility and capacity in power flow control in the system with wind generation. This paper proposes a multi-time scale coordinated scheduling model with DPFC to minimize wind power spillage. Configuration of DPFCs is initially determined by stochastic method. Afterward, two sequential procedures containing day-head and real-time scales are applied for determining maximum schedulable wind sources, optimal outputs of generating units and operation setting of DPFCs. The generating plan is obtained initially in day-ahead scheduling stage and modified in real-time scheduling model, while considering the uncertainty of wind power and fast operation of DPFC. Numerical simulation results in IEEE-RTS79 system illustrate that wind power is maximum scheduled with the optimal deployment and operation of DPFC, which confirms the applicability and effectiveness of the proposed method.

关键词： distributed power flow controller wind power spillage multi-time scales coordinated scheduling

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