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Zbornik radova, Elektrotehnički institut "Nikola Tesla"
2014, iss. 24, pp. 1-14
article language: Serbian
document type: Professional Paper
doi:10.5937/zeint24-6997


Assessment of the operating conditions of coordinated Q-V controller within secondary voltage control system
aUniversity of Belgrade, Electrical Engineering Institute “Nikola Tesla“, Belgrade
bSchool of Electrical and Electronic Engineering, The University of Manchester, Manchester, United Kingdom
cPD 'Termoelektrane Nikola Tesla' d.o.o, Obrenovac, Srbija

e-mail: Dusan.Arnautovic@ieent.org

Project

Energy efficiency Improvement of Hydro and Thermal power plants in EPS by development and implementation of power electronics based regulation and automation equipment (MESTD - 33020)

Abstract

The paper, discusses the possibility to use coordinated Q-V controller (CQVC) to perform secondary voltage control at the power plant level. The CQVC performs the coordination of the synchronous generators' (SG) reactive power outputs in order to maintain the same total reactive power delivered by the steam power plant (SPP), while at the same time maintaining a constant voltage with programmed reactive droop characteristic at the SPP HV busbar. This busbar is the natural pilot node for secondary voltage control at HV level as the node with maximum power production and maximum power consumption. In addition to voltage control, the CQVC maintains the uniform allocation of reactive power reserves at all SGs in the power plant. This is accomplished by setting the reactive power of each SG at given operating point in accordance to the available reactive power of the same SG at that point. Different limitations imposed by unit's and plant equipment are superimposed on original SG operating chart (provided by the manufacturer) in order to establish realistic limits of SG operation at given operating point. The CQVC facilitates: i) practical implementation of secondary voltage control in power system, as it is capable of ensuring delivery of reactive power as requested by regional/voltage control while maintaining voltage at system pilot node, ii) the full deployment of available reactive power of SGs which in turn contributes to system stability, iii) assessment of the reactive power impact/contribution of each generator in providing voltage control as ancillary service. Furthermore, it is also possible to use CQVC to pricing reactive power production cost at each SG involved and to design reactive power bidding structure for transmission network devices by using recorded data. Practical exploitation experience acquired during CQVC continuous operation for over two years enabled implementation of the optimal setting of reference voltage and droop on daily, monthly and seasonal basis. Finally, the paper suggests and elaborates on studies related to application of several coordinated Q-V controllers in power system to facilitate secondary voltage control. It is shown that the CQVC can be used to maintain desired voltage at assigned pilot node in the power system with predefined reactive droop characteristic, and such maintain the required voltage profile across the transmission network based on commands received from upper hierarchical control level.

Keywords

coordinated reactive power - voltage control; secondary voltage control; reactive power; reactive power reserves

References

Corsi, S., Pozzi, M., Sabelli, C., Serrani, A. (2004) The Coordinated Automatic Voltage Control of the Italian Transmission Grid, Part II: Control apparatuses and field performance of the consolidated hierarchical system. IEEE Trans. on Power Systems, 19(4): 173
Davies, J.B., Midford, L.E. (2000) High side voltage control at Manitoba hydro. in: Proc. IEEE PES Summer Meeting, Seattle, WA, Jul. 16–20, 1: 271-2
Dragosavac, J., Janda, Ž., Milanović, J.V. (2011) PLC Based Model of Reactive Power Flow in Steam Power Plant for Coordinated Q-V Control. IEEE Trans. on Power Systems, 26(4): 225
Dragosavac, J., Janda, Ž., Milanović, J.V. (2012) Coordinated Reactive Power - Voltage Controller for Multi Machine Power Plant. IEEE Trans. on Power Systems, 27(3): 154
Dragosavac, J., Janda, Ž., Milanović, J.V., Arnautović, D. (2013) Robustness of Commissioned Coordinated Q-V Controller for Multi-machine Power Plant. IEEE Trans. on Power Systems, 28(2): 141
Dragosavac, J., Janda, Z., Milanovic, J.V., Arnautovic, D., Radojicic, B. (2012) On-line Estimation of Available Generator Reactive Power for Network Voltage Support. in: 8th Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion (MEDPOWER 2012), 1-3 Oct., : 30
Lefebvre, H., Fragnier, D., Boussion, J.Y., Mallet, P., Bulot, M. (2000) Secondary coordinated voltage control system: feedback of EDF. in: Proc. IEEE PES Summer Meeting, Seattle, WA, Jul. 16–20, 1: 290-2
Nobile, J.Z.E., Bose, A., Bhattacharya, K. (2004) Localized Reactive Power Markets Using the Concept of Voltage Control Areas. IEEE Trans. on Power Systems, 19(3): 155
Rabiee, A., Shayanfar, H.A., Amjady, N. (2009) Reactive Power Pricing. Power and Energy Magazine, IEEE, 7(1): 18-3