Power system stability enhancement of the future GB transmission system using HVDC link

Abstract

Bulk Abstract-As a consequence of the fast development of renewable energy sources in the UK, higher transmission capacity will be required to integrate potentially large volumes of wind generation in the future. Also, over the next decade, maintaining the transmission system security and stability will become more difficult. A major increase in the application of HVDC transmission technology and the deployment of series compensation within the existing AC transmission system is expected to provide the required transfer capability in the future. However, there is also a need to employ smarter ways of operating these power flow control devices. Firstly, this paper investigates the capability of the HVDC link in improving the inter-area power oscillation damping. Two approaches in the design of power oscillation damping controller are demonstrated. Secondly, the paper presents the application of the HVDC links set-point adoption for the stability enhancement through a novel non-parametric control system design approach using the sample regulator control design method. This method is mainly attractive for applications in large integrated power systems since the controller design only requires knowledge of the nonparametric model of the power system i.e. the open-loop step response, which is easily obtainable compared to development of parametric model of the power system.

Review of Wide-Area Controllers for Supporting Power System Stability

“…Table 1 summarizes the total number of works included in the database. In total, 181 papers were found using the aforementioned search criteria ( [44], [45], [49], [55], [56], [57], [58], [59], [60], [61], [62], [64], [65], [66], [67], [68], [73], [78], [80], [81], [90], [96], [104], [105], [106], [107], [108], [109], [110], [111], [112], [113], [114], [115], [116], [117], [118], [119], [120], [121], [122], [123], [124], [125], [126], [127], [128], [129],…”

“…Hence, plenty of control strategies have been developed with HVDC-links as main controllable devices, especially for addressing transient rotor-angle stability and inter-area oscillations issues. Most works rely purely on HVDC-links, as in [49], [106], [107], [115], [121], [133], [138], [142], [154], [155], [159], [161], [175], [182], [187], [213], [221], [222], [238], and [254]. However, in practical large-scale interconnected systems, there are usually various interarea oscillation modes with various oscillation shapes that act together and endanger the stable and secure operation of power systems.…”

“…Among these works are [55], [108], [110], [111], [112], [115], [119], [120], [121], [228], [230], [241], [245], [250], and [255]. Traditional PI and PID controllers have also been studied, as presented in [56], [106], [107], and [118]. In [259], a bus selection method was proposed, where additional active/reactive power is injected or consumed to enhance the stability of the system.…”

Comparison of dynamic performances of TCSC, Statcom, SSSC on inter-area oscillations

“…Damping ratio ξ is a quantitative measure that relates the oscillation decaying following after a disturbance. In inter-area oscillation damping studies, the mode is called "critical" which should be usually suppressed by a compensator such as FACTS device, if its damping ratio is less than 5 % [20], [21], [22]. Table 2 lists the oscillation frequency and the damping ratio of each case study.…”