Swissgrid Ltd.

Laufenburg, Switzerland

Swissgrid Ltd.

Laufenburg, Switzerland
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Scherer M.,ETH Zurich | Scherer M.,Swissgrid Ltd | Haubensak O.,Swissgrid Ltd | Staake T.,ETH Zurich
Energy Policy | Year: 2015

Power systems require a continuous balance of supply and demand. In Europe, this task is shared between Balance Responsible Parties (BRPs) and Transmission System Operators (TSOs). For this purpose, the European electricity sector consists of several markets. Objective of this paper is to investigate distorted incentives that stem from loopholes in the market design which BRPs can use to undermine electricity balancing principles in favour of gaming opportunities between the domestic imbalance energy pricing and international wholesale markets. These incentives are evaluated using historical data from the Swiss power system which features a typical European imbalance pricing mechanism. The results imply that little effort would have been needed to make a good profit at the expense of system security. The major loophole arises from the interdependence between cross-border trading and national imbalance energy pricing. Bearing in mind the European Union's Third Energy Package, the importance of national balancing mechanisms will increase strongly. In this context, national remedies to cope with distorted incentives are outlined and the importance of harmonising balancing markets on an international level is elaborated. © 2015 Elsevier Ltd.

Abbaspourtorbati F.,Swissgrid Ltd. | Scherer M.,Swissgrid Ltd. | Ulbig A.,ETH Zurich | Andersson G.,ETH Zurich
Proceedings of the American Control Conference | Year: 2012

This paper focuses on designing a framework for the activation of tertiary control reserves in order to improve frequency control performance. Considering the fact that tertiary control reserves are not immediately available and, therefore, must be requested in advance, a pattern is proposed based on a Model Predictive Control (MPC) scheme. Linear regression models based on a robust Maximum Likelihood Estimate (MLE) are employed to predict the control signal. The proposed optimization technique is simulated using measurements from the Swiss power system to illustrate technical and economic aspects. © 2012 AACC American Automatic Control Council).

Scherer M.,Swissgrid Ltd. | Andersson G.,ETH Zurich
2016 IEEE International Energy Conference, ENERGYCON 2016 | Year: 2016

The concept of imbalance netting is meant to avoid the occurrence of opposing active power reserve activations between control areas that feature a decentralized load-frequency control structure. Upcoming regulations of the European Union are expected to propose this process to European system operators. This paper outlines a basic blueprint for a large-scale imbalance netting process among areas with limited cross-border transfer capacity by means of multi-objective optimization. The algorithm is applied to a model of the European power system in order to test the framework for its practical applicability. © 2016 IEEE.

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.

Abbaspourtorbati F.,Ecole Polytechnique Federale de Lausanne | Cherkaoui R.,Ecole Polytechnique Federale de Lausanne | Zima M.,Swissgrid Ltd.
19th Power Systems Computation Conference, PSCC 2016 | Year: 2016

This paper presents a real-world application of stochastic programming in the Swiss hydro-based system. The seasonal hydrological conditions may cause insufficient market volume to an extent that security criteria (i.e., the criteria determining of reserve amount) may not be met. In this situations, the question arises to what extend the current pre-defined security criteria can be relaxed while respecting the current market properties. We provide a framework accounting for the trade-off between the expected procurement cost of reserves and security criteria. Additionally, this paper provides a risk-averse formulation of the current clearing model. The proposed approach is simulated using data of the Swiss reserve market to illustrate technical and economic aspects. © 2016 Power Systems Computation Conference.

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.

Zerva M.,Swissgrid Ltd. | Geidl M.,Swissgrid Ltd.
Proceedings - 2014 Power Systems Computation Conference, PSCC 2014 | Year: 2014

The provision of reactive power/energy for the purposes of voltage control of the transmission system is, pursuant to the Swiss Electricity Supply Act of 2007, part of the ancillary services market. In line with it, Swissgrid, the Swiss TSO, developed a concept for the coordinated voltage control of the 220/380-kV transmission system that enables, along with transmission connected power plants, the active participation of underlying distribution grids. The current paper outlines the voluntary active participation of transmission connected distribution transformers to the coordinated voltage control. It describes the concept's features and illustrates the behavior of active distribution transformers in terms of reactive power exchange, voltage quality at the connection node, as well as the associated financial incentives. © 2014 Power Systems Computation Conference.

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.

Avramiotis-Falireas I.,Swissgrid Ltd. | Qu H.,Swissgrid Ltd. | Abbaspourtorbati F.,Swissgrid Ltd. | Zima M.,Swissgrid Ltd.
International Conference on the European Energy Market, EEM | Year: 2016

This paper investigates the value of nodal information of power systems in real-time. It is a fact that real-time security assessment of the power system requires nodal scheduling information of generating units, however, the value of this information from a market aspect is seldom discussed. In other words, precise schedules help the system operator not only assess the system security, but also estimate potential balancing energy exchange with neighbouring countries. This can be translated to the potential of establishing a real-time cross-boarder balancing market. This paper proposes an optimization-based method for cross-border balancing energy exchange and presents the results from applying the proposed method to the Swiss transmission system. © 2016 IEEE.

Abbaspourtorbati F.,Swissgrid Ltd. | Zima M.,Swissgrid Ltd.
International Conference on the European Energy Market, EEM | Year: 2013

This paper proposes an optimization approach for dimensioning and procuring frequency control reserves in one integrated manner by TSOs in self-scheduling markets. The optimization approach considers procurement costs of frequency control reserves in the objective function while accommodating a hybrid probabilistic/deterministic system security metric in the constraints for frequency control reserves provision. The beginning of the decision period is at the beginning of the week when the prices of the daily market are not available and are therefore modeled by a set of scenarios. We formulate this two-stage decision making problem under uncertainty in the framework of stochastic programming, where the constraints are fulfilled for any scenarios. The simulation of real data derived from the Swiss ancillary services market illustrates that the new approach is computationally tractable, technically optimal, and economically beneficial. Therefore, the practical implementation of the proposed approach is planned on the Swiss ancillary services market in 2013. © 2013 IEEE.

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