D. Papadaskalopoulos, Panagiotis Fatouros, G. Strbac
{"title":"Addressing demand response concentration under dynamic pricing","authors":"D. Papadaskalopoulos, Panagiotis Fatouros, G. Strbac","doi":"10.1109/PTC.2015.7232617","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232617","url":null,"abstract":"Dynamic pricing constitutes a promising approach for realizing the significant potential of flexible demand. However, naïve application of dynamic pricing leads to demand response concentration at the lowest-priced periods, yielding significant new demand peaks and inefficient system operation. A previously proposed measure imposing a flexibility restriction on flexible loads may not be acceptable by their users. This paper proposes an alternative measure, where this hard flexibility restriction is replaced by a soft, non-linear price signal, penalizing the extent of flexibility utilized by the loads. This signal is customized to the properties of the different flexible load types, by penalizing the square of the demand and the duration of cycle delay of loads with continuously adjustable power levels and deferrable cycles respectively. Regarding the former type, this non-linear pricing approach is shown to outperform the flexibility restriction approach in flattening the demand profile and achieving efficient system operation. Regarding the latter type, randomization of the non-linear price is shown to bring significant additional benefits. These contributions are supported by case studies on a model of the UK system, with smart-charging electric vehicles and wet appliances with delay functionality used as representative examples of the above flexible load types.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132956656","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":"Platform based on Hybrid Real-Time Power System Simulator for development and research of Intelligent Power Systems with active-adaptive networks","authors":"M. Andreev, A. Sulaymanov","doi":"10.1109/PTC.2015.7232239","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232239","url":null,"abstract":"This paper reveals the application of the Hybrid Real-Time Power System Simulator (HRTSim) as a universal hardware and software platform for developing solutions to design and research of Intelligent Power Systems with active-adaptive networks. Also, features of HRTSim and experience of its application for solving tasks of development of methods and tools for control of regimes in Intelligent Power Systems with active-adaptive networks are briefly described in the paper.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126590358","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":"Developing a hierarchical scheme for outage management in multi-microgrids","authors":"H. Farzin, M. Fotuhi‐Firuzabad, M. Moeini‐Aghtaie","doi":"10.1109/PTC.2015.7232575","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232575","url":null,"abstract":"This paper investigates the performance of a smart distribution system comprised of multi-microgrids during emergency conditions. It also proposes a hierarchical scheme for outage management in such a system to enhance the security of supply during contingencies. This goal is achieved through sharing the available generation and storage capacities among different microgrids. In this regard, at first, a well-organized framework is devised in order to introduce the roles and tasks of each player in operation stage of a multi-microgrids system. Based on this framework, the general optimization model that needs to be evaluated in the proposed outage management scheme is formulated. Then, various aspects of its implementation are studied through application to a test system. The results verify the effectiveness of the proposed scheme in enhancing the reliability of the distribution system and demonstrate the benefits it will bring to both customers and distribution system operators.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131117836","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":"Voltage control in MV distribution networks through coordinated control of tap changers and renewable energy sources","authors":"D. Jakus, J. Vasilj, P. Sarajcev","doi":"10.1109/PTC.2015.7232391","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232391","url":null,"abstract":"The significant penetration of renewable energy sources (RES), like wind and solar power plants, into distribution networks has changed their operation considerably and brought new challenges for distributed system operators (DSOs). One of the main problems associated with high penetration of variable RES into distribution networks is voltage rise problem along the radial distribution feeders, with high production variability causing frequent operations of the onload tap changers (OLTC), thereby causing significant deterioration of their operation life expectancy. This paper proposes new method for the Volt Var control in the MV distribution network with the high share of RES relative to the distribution system load. The problem is casted as the mixedinteger nonlinear programming (MINLP) problem associated with the voltage control in the distribution network with the objective to maximize daily RES production and through reactive power control to minimize the daily distribution system losses using the Benders' decomposition method. In order to reduce the number of OLTC switching operations, the time instances in which the change is possible are set a priori. The effectiveness of the proposed method is tested on well-known IEEE 69-bus system.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133320719","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}
M. Silva, F. Fernandes, H. Morais, S. Ramos, Z. Vale
{"title":"Hour-ahead energy resource management in university campus microgrid","authors":"M. Silva, F. Fernandes, H. Morais, S. Ramos, Z. Vale","doi":"10.1109/PTC.2015.7232449","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232449","url":null,"abstract":"The management of intermittent energy resources by a microgrid operator (MGO) are a key aspect of future smart grids. A microgrid allows act as a single controllable entity and can operate in both grid-connected or in islanded mode. The present paper proposes a platform to be used by MGO regarding the energy resource management in smart grids and considering day-ahead and hour-ahead time-horizons. This method considers that the energy resources are managed by a MGO that establishes contracts with their client. The operator is able to manage the consumption and generation resources, also including demand response programs, obtaining profits from selling electricity to the main network. The model uses full AC power flow and the energy buying and selling from/to the main network. The case study considers the internal low voltage distribution network of a real university campus, and the projection of distributed energy resources based on the evolution scenario for the year 2050.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127417708","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":"Distribution transformer mid-term heavy load and overload pre-warning based on logistic regression","authors":"Ming Li, Qinsheng Zhou","doi":"10.1109/PTC.2015.7232418","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232418","url":null,"abstract":"in areas with rapid economic growth, distribution transformer heavy load and overload occur frequently, which may damage the equipment and even lead to power outages. Therefore, it is critical for the utilities to know which distribution transformers are more likely to have the heavy load /overload conditions in the next year in order to facilitate asset management in distribution network. However, current load forecasting methods are not suitable for handling the large amount of distribution transformers with a high variety of load patterns. Utilizing real data from a utility, a mid-term pre-warning analytics model has been developed to provide the heavy load and overload probabilities in the next year for each distribution transformer in an area. The mid-term pre-warning models have been implemented in a major utility in China.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115424332","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":"Day-ahead primary power reserve planning and day-D primary frequency control of a Li-ion battery","authors":"S. Amamra, B. Francois, J. Lugaro","doi":"10.1109/PTC.2015.7232677","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232677","url":null,"abstract":"Currently the increased grid penetration levels of renewable sources are at the expense of the conventional power plants. Future large scale development renewable generators can only be imagined if grid support functions, traditionally achieved by conventional power plants, will be provided by new technologies. Since grid support with energy storage devices is becoming more attractive, the aim of this paper is to analyze the viability of providing primary frequency regulation with a lithium-ion based energy storage system. A control strategy of the Energy Storage System is analyzed and simulated in terms of primary frequency regulation. Primary upward and primary downward frequency regulation are simulated for several time windows in a day and a SoC strategy regulation algorithm is applied. The control algorithm masters the SoC in a 20-80% bandwith.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124552034","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":"Integrated State & topology estimation based on a priori topology information","authors":"V. Freitas, A. Simões Costa","doi":"10.1109/PTC.2015.7232440","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232440","url":null,"abstract":"This paper addresses the simultaneous estimation of state variables and network topology in the context of power system real-time modeling. The proposed method assumes that selected substations are modeled at the bus section level, and circuit breakers and disconnects are explicitly represented. Available information on the statuses of such switching branches are then treated as a priori topology information to be processed by a specialized estimator. The presumed topology will eventually be either validated or corrected by using the information conveyed by real-time measurements. An algorithm based on a fast version of orthogonal Givens rotations is employed to solve the integrated state & topology estimation problem. The proposed method preserves the bad data processing capabilities of weighted least-squares state estimators. The performance of the integrated state & topology estimator is assessed through its application to test systems derived from IEEE benchmark networks.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116471547","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}
L. Zeni, B. Hesselbaek, P. Sørensen, A. Hansen, P. Kjaer
{"title":"Control of VSC-HVDC in offshore AC islands with wind power plants: Comparison of two alternatives","authors":"L. Zeni, B. Hesselbaek, P. Sørensen, A. Hansen, P. Kjaer","doi":"10.1109/PTC.2015.7232291","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232291","url":null,"abstract":"The subject of this paper is the control of offshore AC collection and export networks behind a voltage source converter based high voltage direct current transmission system. The inertia-less nature of such grids makes the control of voltages and power flows potentially more flexible, but at the same time more prone to instabilities. Focus in this paper is on a voltage source converter based high voltage direct current connected wind power plant. Two state-of-art controllers for the offshore high voltage direct current converter station are compared, both at no-load and when wind turbine converters are producing power and controlled with usual vector current control. Sensitivity analyses help identify critical factors influencing stability. The influence of lumping the wind power plant into one converter is assessed by comparison with the full model. The conclusions identify the preferred control technique.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116831089","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}
Florian Thams, J. Suul, S. D'arco, M. Molinas, F. Fuchs
{"title":"Stability of DC voltage droop controllers in VSC HVDC systems","authors":"Florian Thams, J. Suul, S. D'arco, M. Molinas, F. Fuchs","doi":"10.1109/PTC.2015.7232614","DOIUrl":"https://doi.org/10.1109/PTC.2015.7232614","url":null,"abstract":"Future multi-terminal HVDC systems are expected to utilize dc voltage droop controllers and several control implementations have been proposed in literature. This paper first classifies possible dc droop implementations in a simple framework. Then, the small-signal stability of a VSC-based converter station is analyzed for all the identified droop control schemes. The stability range for the system is determined as a function of the droop gain and is used to compare the flexibility and robustness of the implementations. The comparisons reveal that the droop implementations based on the ac current and dc voltage achieve a wider stability region than the other schemes and a limited sensitivity to the droop gain.","PeriodicalId":193448,"journal":{"name":"2015 IEEE Eindhoven PowerTech","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116831434","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}