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access icon free Real-time optimisation of short-term frequency stability controls for a power system with renewables and multi-infeed HVDCs

  • Author(s): Luping Wang 1 ; Xiaorong Xie 1 ; Xiaoliang Dong 2 ; Ying Liu 3 ; Hongming Shen 3
    • View affiliations
  • Source: Volume 12, Issue 13, 01 October 2018, p. 1462 – 1469
    DOI:  10.1049/iet-rpg.2017.0884 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Received 30/12/2017, Accepted 15/04/2018, Revised 18/03/2018, Published 16/04/2018

Short-term frequency stability (STFS) is becoming a great concern for a regional receiving-end power system such as the East China Power Grid (ECPG) mainly for two reasons: (i) the increasing percentage of power injected from multi-infeed (ultra-) high-voltage DCs (HVDCs) with the skyrocketed capacities; (ii) the replacement of traditional generation by the continuously growing inertia-less renewables. However, the existing emergency control is not adaptive enough to maintain STFS under varying operation conditions. In this study, a real-time optimised control is proposed to solve the issue more efficiently. It combines emergency power boosting (EPB) of HVDC and emergency demand response (EDR) in a coordinated way. The optimal control problem is formulated based on the online-updated models that reflect the current state of the system and the dynamic responses of multiple types of generators. By converting the non-linear constraint into a linear matrix inequality, the allocation of EPB and EDR can be optimised in a real-time and coordinated way. The performance of the proposed control and its advantages over the existing one are verified by simulation studies on the model of ECPG with low, normal and high penetrations of renewables.

Inspec keywords: optimal control; dynamic response; optimisation; frequency stability; HVDC power transmission; linear matrix inequalities; power grids; frequency control; demand side management; power transmission control

Other keywords: linear matrix inequality; optimal control problem; inertia-less renewables; short-term frequency stability controls; emergency power boosting; STFS; multiinfeed high-voltage DCs; ECPG; multiinfeed HVDCs; online-updated models; emergency demand response; nonlinear constraint; emergency control; real-time optimised control; East China Power Grid; regional receiving-end power system; dynamic responses

Subjects: Power system control; Optimisation techniques; Control of electric power systems; Frequency control; Algebra; Power system management, operation and economics; d.c. transmission; Optimal control; Optimisation techniques; Algebra

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