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Laufenburg, Switzerland

Geidl M.,Swissgrid Ltd.
Proceedings of the Mediterranean Electrotechnical Conference - MELECON | Year: 2010

This paper outlines the organization of the ancillary service "voltage control and provision of reactive power" for the deregulated Swiss electricity market environment. A central voltage/reactive power management concept was elaborated and introduced with the respective operational procedures, from dayahead planning to ex-post monitoring and accounting. Economic incentives were defined for all involved parties within Switzerland. This article describes the main features of the concept and its implementation. A conclusion summarizes practical experience and possible future improvements. © 2010 IEEE. Source

Scherer M.,Swissgrid Ltd. | Zolotarev P.,TransnetBW GmbH
2015 IEEE Eindhoven PowerTech, PowerTech 2015 | Year: 2015

This paper investigates different control implementations for the frequency-response coupling between synchronous areas that feature a decentralized load-frequency control structure. The technical basics are presented, along with a 2-area benchmark system implemented in SIMULINK. Two new concepts are applied: Frequency-response delivery and frequency netting. The results show that both concepts are robust and stable. But as the frequency-response coupling affects the frequency performance in both the connecting and receiving synchronous area, the control scheme determines the overall system reliability. There are two reasonable options for the unilateral frequency-response delivery; the choice depends on the difference in the frequency restoration design between the synchronous areas. For frequency netting, only one scheme is applicable. © 2015 IEEE. Source

De La Torre Rodriguez M.,Red Electrica de Espana | Scherer M.,Swissgrid Ltd. | Whitley D.,Statnett SF | Reyer F.,Amprion GmbH
IEEE Power and Energy Society General Meeting | Year: 2014

This paper presents the methodology and results of a risk assessment to match the frequency containment dimensioning and resulting security performance by analyzing the relationship between the available amount of frequency-response reserves and the frequency quality performance in the European power system. The proposed dimensioning technique is simulated applying Monte Carlo simulations to measurements from the European power system. The results show that as the risk of running out of frequency containment reserves due to market induced load-generation imbalances increases, the amount of containment reserves must regularly be validated and eventually adjusted or the system will face a measurable decrease in reliability. © 2014 IEEE. Source

Lymperopoulos I.,Ecole Polytechnique Federale de Lausanne | Qureshi F.A.,Ecole Polytechnique Federale de Lausanne | Nghiem T.,Ecole Polytechnique Federale de Lausanne | Khatir A.A.,Swissgrid Ltd. | Jones C.N.,Ecole Polytechnique Federale de Lausanne
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2015

Ancillary services constitute the cornerstone of the power grid. They allow for an efficient system operation, provide resilience to uncertainties and establish safeguards against unprecedented events. Their importance is growing due to the rise of grid decentralisation and integration of intermittent, renewable power sources, which lead to more variability and uncertainty in the system. Today, the vast share of ancillary services is provided by large generating units. An ongoing effort by research and business entities focuses on using variation of loads connected to the power grid in order to increase significantly the provision of such services, hopefully at a reduced cost.We examine here, from an economic perspective, the use of commercial buildings as ancillary service providers based on real prices from the Swiss electricity market. We calculate the effect of retail electrical prices on the economic performance of a building and find that for the rates charged in the least expensive cantons a single building can reduce its overall energy costs, when participating in the ancillary services market. For the high end of prices this gradually becomes prohibitive but can be alleviated for a building that has a need for electricity during nighttime hours, as well as daytime. Finally, we show, the counter-intuitive result that providing ancillary services can increase the comfort levels of a building at a decreased cost. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved. Source

Scherer M.,Swissgrid Ltd. | Andersson G.,ETH Zurich
2015 IEEE Eindhoven PowerTech, PowerTech 2015 | Year: 2015

Recent studies have discussed the operational challenges in the European power system which come along with the increasing penetration of intermittent generation in the coming years. Based on time sequential Monte Carlo simulations, this paper investigates to what extent a decentralized frequency control structure is appropriate with respect to three European scenarios. To evaluate the future adequacy of the current control structure and its active power reserves, a reduced simulation model, which determines the frequency quality in Continental Europe, is presented. The results reveal that the control framework is technically robust, but either the active power reserves need to be significantly increased by end-2020 to sustain the current real-time approach or the frequency control policy must be changed in favor of retrospectively averaging frequency deviations by means of joint control actions. © 2015 IEEE. Source

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