Development of PCS to utilize differential pressure energy in district heating systems with reduced DC‑link voltage variation

Yeongsu Bak; Kyo-Beum Lee

Development of PCS to utilize differential pressure energy in district heating systems with reduced DC‑link voltage variation

Yeongsu Bak

Kyo-Beum Lee

Vol. 20, No. 4, pp. 1109-1118, Jul. 2020

10.1007/s43236-020-00091-x

District heating system

Back-to-back converter

Differential pressure control valve

DC-link voltage variation

Permanent-magnet synchronous generator

Abstract

This paper proposes a power conversion system (PCS) to utilize the differential pressure (DP) energy in district heating systems with reduced DC-link voltage variation. A differential pressure control valve (DPCV) is usually used to regulate pressure for heat transmission to remote areas in district heating systems. However, there is a high probability of malfunctions and failures of the DPCV, due to cavitation, since high-pressure fluids are used in district heating systems. Therefore, a PCS for utilizing DP energy in the district heating system replacing the DPCV is proposed in this paper. In addition, the DC-link voltage of the PCS greatly fluctuates when a sudden change occurs in a hydraulic turbine. It is effectively relieved by using the feed-forward control method. The effectiveness of the PCS for utilizing the DP energy in district heating systems with reduced DC-link voltage variation is verified by simulation and experimental results.

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Cite this article

[IEEE Style]

Y. Bak and K. Lee, "Development of PCS to utilize differential pressure energy in district heating systems with reduced DC‑link voltage variation," Journal of Power Electronics, vol. 20, no. 4, pp. 1109-1118, 2020. DOI: 10.1007/s43236-020-00091-x.

[ACM Style]

Yeongsu Bak and Kyo-Beum Lee. 2020. Development of PCS to utilize differential pressure energy in district heating systems with reduced DC‑link voltage variation. Journal of Power Electronics, 20, 4, (2020), 1109-1118. DOI: 10.1007/s43236-020-00091-x.