Abstract
High-voltage direct current (HVDC) transmission is playing an increasingly important role in modern power systems, and the resulted power/voltage stability issue has raised widespread concern. This paper presents an on-line power/voltage stability index (PVSI) for multi-infeed HVDC (MIDC) systems. Different from the existing indices which are developed mainly for off-line and static analysis, the proposed PVSI can be applied in real time. Effects of system changes on stability assessment such as change of system states and control strategies are considered. Thus, helpful guidance can be provided for on-line HVDC stability and controls. The PVSI is originally deduced for single-infeed HVDC systems in an “AC way” by analyzing the power and voltage stability of both pure AC systems and HVDC systems. Moreover, its on-line application in practical MIDC systems is realized by building an equivalent single-infeed model, and utilizing nowadays measurement and communication infrastructures such as wide-area measurement system (WAMS). The effectiveness of the PVSI is verified through simulations in real-time digital simulator (RTDS).
Highlights
High-voltage direct current (HVDC) transmission is getting more and more attention and applications due to its advantage in long-distance bulk power transmission and fast modulation [1, 2]
In the planning of offshore wind farms, HVDC transmissions are widely applied for grid connection [3, 4], and China Southern Power Grid (CSG) is building a large-scale multi-infeed HVDC (MIDC) network with a total installed generation capacity of more than 243 GW [1]
Reference [16] focuses on the power stability phenomenon with the help of maximum power curves (MPCs), and [6] focuses on the voltage stability phenomenon by expanding the concept of voltage sensitivity factor (VSF) [17]
Summary
High-voltage direct current (HVDC) transmission is getting more and more attention and applications due to its advantage in long-distance bulk power transmission and fast modulation [1, 2]. It is still difficult to clearly consider the impact of nonlinear and time-varying control of the system during transient In another point of view, power and voltage stability are discussed free from the framework of SCR. Reference [16] focuses on the power stability phenomenon with the help of maximum power curves (MPCs), and [6] focuses on the voltage stability phenomenon by expanding the concept of voltage sensitivity factor (VSF) [17] These works discover the close relationship between power and voltage stability of MIDC systems with sensitivity methods, and further depict the power/voltage stability margin of the system. Compared to the existing power/voltage analysis techniques, the proposed PVSI can be applied to MIDC systems in real time. The rest of this paper is organized as follows: Section 2 compares the power/voltage stability in AC and AC/DC systems, and deduces the PVSI for single-infeed HVDCs in an ‘‘AC way’’.
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