Influence of Scaled Photovoltaic Grid-Connected System on SSO Characteristic of Thermal Power Unit

doi:10.3969/j.issn.1000－7229.2016.09.009

Abstract

Abstract: Large-scaled development of photovoltaic （PV） and concentrated to power grid, is one of the important forms of solar energy resources utilization in China. The fluctuated PV power combined with adjustable conventional thermal power unit is an important way to enhance the capacity utilization efficiency of AC transmission line.In the above scenario, it is urgent to research the influence of PV on the sub-synchronous oscillation （SSO） damping characteristics of proximate thermal unit. This paper establishes the electromagnetic transient simulation model of PV power generation unit including three main parts such as battery plates, voltage source converter and control system. And then, this paper studies the influences of large-scaled grid-connected PV and its different electrical parameters on SSO damping characteristics of proximate thermal unit, such as the impedance of collective line, operating points, access location and so on.Aiming at the threat of SSO under AC transmission compensated with series capacitor, this paper proposes the suppression measure that the additional damping controller is installed into the dynamic reactive compensation device located at the PV power collection station. The simulation results verify the effectiveness of the proposed measure.

Key words: large-scale photovoltaic, electromagnetic transient, thermal power unit, sub-synchronous oscillation（SSO）, damping characteristics, additional controller

CLC Number:

TM 621

ZHENG Chao, LI Yuan. Influence of Scaled Photovoltaic Grid-Connected System on SSO Characteristic of Thermal Power Unit[J]. Electric Power Construction, 2016, 37(9): 62-.

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