{"title":"Measuring AC frequency and amplitude with gauge voltage group","authors":"K. Seki","doi":"10.1109/POWERCON.2012.6401290","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401290","url":null,"abstract":"This paper proposes a new method to measure AC frequency and amplitude by combining group theory and spiral vector theory. At first, the real frequency of power system is defined associated with a rotation phase angle in the complex plane. Then with the rotation phase angle and three voltage vectors, a gauge voltage group is constructed. Therefore the group's two invariants - frequency coefficient and gauge voltage are discovered, and naturally AC frequency and amplitude are obtained with these invariants. Furthermore, for reducing the influence of noise, gauge sampling frequency is separated from data collecting rate, symmetry breaking criterion is proposed, and simple moving average is made. At last, three numerical examples and one field measurement example are provided. All results show that the proposed method is effective.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127006638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. S. Chen, C. H. Lin, T. Ku, M. Kang, C. Ho, C. F. Chen
{"title":"Rule-based expert system for service restoration in distribution automation systems","authors":"C. S. Chen, C. H. Lin, T. Ku, M. Kang, C. Ho, C. F. Chen","doi":"10.1109/POWERCON.2012.6401405","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401405","url":null,"abstract":"A rule-based expert system is developed for service restoration of distribution systems. The inference engine for a four-way line switch and other distribution components are proposed to implement proper restoration plan after the faulted location has been identified and isolated. The unfaulted but out of service areas are restored efficiently for multiple contingencies simultaneously. To assure the restoration plan can comply with operation regulation, heuristic rules based on the standard operation procedures of Taipower distribution system are included in the best first search of the expert system. For the fault contingency during summer peak season, the load shedding is executed to restore service to as many key customers and load as possible. The priority indices of each feeder and service zone are defined by the key customers within the service territory. A Taipower distribution system with 18 feeders is selected for computer simulation to demonstrate the effectiveness of the proposed methodology. It is found that the service restoration of distribution system can be obtained very efficiently by applying the proposed expert system.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131878733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Chen, Minhui Qian, Ling-zhi Zhu, L. Yao, Fubao Wu, Mei Chen, N. Wang
{"title":"A coordinated reactive power and voltage control system for wind farm grid integration","authors":"N. Chen, Minhui Qian, Ling-zhi Zhu, L. Yao, Fubao Wu, Mei Chen, N. Wang","doi":"10.1109/POWERCON.2012.6401264","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401264","url":null,"abstract":"Rapid increase of wind power installation in China brings new technical issues and challenges for grid security operation. Reactive power and voltage control capability of wind farms is one of key issues that grid operators concern with. This paper presents a coordinated reactive power and voltage control system for wind farm gird integration to meet operation requirements described in the standard of State Grid Corporation of China “Technical rule for connecting wind farm to power system”. The control strategy of the proposed system takes into account the coordination between voltage and power factor. The proposed system includes two control modes, i.e., schedule voltage tracing mode and optimization mode. To prove the effectiveness of the proposed strategy, a simulation study is first implemented. Based on this, a control system with the proposed control strategy is developed. Then a field test is carried out in Shanghai Fengxian Haiwan Wind Farm to verify the characteristics of reactive power output and voltage tracking of the system. The results demonstrate that technique indices of reactive power and voltage control system (RPVCS) can satisfy the requirements of the standard. It can improve the voltage stability by effective control of reactive power of wind farm.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132041515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Economic significance of Basslink in the Australian National Electricity Market","authors":"K. Malla, A. Wood","doi":"10.1109/POWERCON.2012.6401466","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401466","url":null,"abstract":"This paper assesses economic significance of Basslink in terms of market benefits, namely operating, capital and unserved energy cost savings. It presents long term market benefit modelling framework consistent with the Australian Regulatory Investment Test for Transmission to assess the market benefits attributable to Basslink. Economic analysis concludes that Basslink continues to be economic value in the Australian National Electricity Market for a broad range of market development scenarios studied.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133955614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Operation strategies of the load aggregator with electric energy storage","authors":"Yixing Xu, C. Singh","doi":"10.1109/POWERCON.2012.6401254","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401254","url":null,"abstract":"Today in competitive power markets, with higher level of penetration of variable renewable energy resources, electric energy price becomes more volatile and uncertain. The integration of distributed generation into the distribution systems makes the load more volatile. It becomes more challenging for load aggregators to manage energy purchasing cost facing the higher price and load uncertainties. With the rapid development of Electric Energy Storage (EES), operation for load aggregator is more flexible. Within this context, this paper investigates the operation strategies for the load aggregator to manage electric energy cost by utilizing EES. A novel Model Predictive Control (MPC)-based operation strategy is proposed. An operation strategy without EES and an operation strategy with EES are also discussed and studied for comparison. Case studies demonstrate the benefits of utilizing EES and the better performance of the proposed MPC-based operation strategy.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123971183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A simple approach for load identification in current-fed inductive power transfer system","authors":"Zhihui Wang, Xiao Lv, Yue Sun, X. Dai, Yu-peng Li","doi":"10.1109/POWERCON.2012.6401305","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401305","url":null,"abstract":"In inductive power transfer (IPT) system, system parameters dynamical identification is required in order to design system controller. This paper presents a simple and easily-realized method for identifying the location and resistance of load in current-fed IPT system. The method is based on the energy equilibrium equations in primary resonant tank. By further analyzing the characteristics of zero-voltage-switching (ZVS) frequency and exciting current, it can be known that the ZVS frequency is nearly steadiness and the exciting current is constant when load location or parameter varies. Therefore, the final identification method is set up which is only required sampling the DC input current to avoid complex system modeling and requirements of high speed sampling system. Finally experiment has verified the method which is much simple and low-cost for identifying the location and resistance of load accurately.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124539157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An improved control circuit for Series Hybrid Active Power Filter compensating current-voltage harmonics, reactive power and supply unbalance","authors":"M. Mulla, R. Chudamani, A. Chowdhury","doi":"10.1109/POWERCON.2012.6401286","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401286","url":null,"abstract":"In the area of power quality conditioners, the Series Hybrid Active Power Filter (SHAPF) has been focused more because of its multi-functionality and lower inverter rating requirement. Existing control strategies for SHAPF are based on extracting either source current harmonics or load voltage harmonics and are valid for balanced source and load conditions. In this paper, a novel control scheme based on generalised instantaneous power theory for SHAPF is proposed. This control scheme is valid for balanced and unbalanced source conditions and is capable of balancing load voltage while compensating supply current harmonic, load voltage harmonics and load reactive power. The mathematical formulation of the proposed control scheme with its applications to SHAPF is presented. The validity of the proposed control scheme is verified by the simulation study.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"57 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129170613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multi-objective hydro optimal scheduling with flow time","authors":"Xiaolin Ge, Lizi Zhang, Yang Yang","doi":"10.1109/POWERCON.2012.6401259","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401259","url":null,"abstract":"This paper presents a multi-objective model considering flow time for cascaded hydro optimal scheduling. This model concentrates on taking advantage of the peaking regulation and generation for hydro units with two objectives introduced. One of them is minimization of total surplus load, which is surplus system load deducting the generation of hydroelectric generating units; aiming at maximizing the generation of cascaded hydro units in the hydrothermal system. The other is minimization of difference between peak and valley of the surplus load, so that surplus load is as smooth as possible. The model mentioned above is transferred into the mixed integer linear programming for reducing degree of difficulty. So the objective function is converted using fuzzy optimization. And the non-linear constraints including power generating and output limit curve are transformed by introducing multiple sets of auxiliary variables and related constraints. Numerical results demonstrate the effectiveness and the efficiency of the proposed model.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116637611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combining Differential Evolution Algorithm with biogeography-based optimization algorithm for reconfiguration of distribution network","authors":"Jingwen Li, Jin-quan Zhao","doi":"10.1109/POWERCON.2012.6401351","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401351","url":null,"abstract":"A method combining differential evolution algorithm with biogeography-based optimization algorithm was proposed for distribution network reconfiguration with the objective of network loss minimum. In the solving processes, through simplifying the structure of distribution network topology and using the encoded mode, which based on the loop coding, the number of solutions, which can't keep the network radiating, was greatly reduced. The proposed optimization method combines the advantages of differential evolution algorithm and biogeography-based optimization algorithm. It effectively overcomes the defect of early-maturing, improves the search speed and increases the probability of the optimal solution. A typical example of 69 nodes case was simulated by using the proposed algorithm. The results show that the proposed method is efficient, rapidly convergent and having good stability.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117213186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimal location of unified power flow controller by differential evolution algorithm considering transmission loss reduction","authors":"G. I. Rashed, Yuanzhan Sun, K. Rashed, H. Shaheen","doi":"10.1109/POWERCON.2012.6401297","DOIUrl":"https://doi.org/10.1109/POWERCON.2012.6401297","url":null,"abstract":"This paper presents a Differential Evolutionary (DE) algorithm for finding the optimal location and the best parameter setting of Unified Power Flow Controller (UPFC) for minimizing the active and reactive power losses in the power system. UPFC is one of the most important Flexible Alternating Current Transmission Systems (FACTS) devices that can simultaneously control the voltage magnitude at the sending end and the active and reactive power flows at the receiving end bus. By re-dispatching the power flows in power systems, the minimization of power losses can be obtained through optimal allocation of UPFC. However, the cost of installing UPFC in the power system is too high. Therefore the objective function developed in this paper in such a way to find a compromise solution to this problem. Simulations have been implemented in MATLAB and the IEEE 14-bus and IEEE 30-bus systems have been used as a case study. Also for the purpose of comparison the proposed technique was compared with another optimization technique namely Particle Swarm Optimization (PSO). The results we have obtained indicate that DE is an easy to use, robust, and powerful optimization technique compared with particle swarm optimization (PSO). Installing UPFC in the optimal location determined by DE can significantly minimize the active and reactive power loss in the network.","PeriodicalId":176214,"journal":{"name":"2012 IEEE International Conference on Power System Technology (POWERCON)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115451681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}