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access icon free IDA-PB control with integral action of Y-connected modular multilevel converter for fractional frequency transmission application

© The Institution of Engineering and Technology
Received 06/05/2017, Accepted 20/08/2017, Revised 09/08/2017, Published 22/08/2017

Y-connected modular multilevel converter (Y-MMC) is a new topology of direct AC/AC power conversion, with broad application prospects in fractional-frequency transmission system. This study studies the mathematical model of Y-MMC and builds the port-controlled Hamiltonian model. Since vector control scheme can hardly ensure global stability, the interconnection and damping assignment passivity-based control (IDA-PBC) method is applied for controller design of Y-MMC. Three typical IDA-PBC strategies are then proposed, featuring the asymptotical stability of the desired equilibrium. To eliminate steady-state error, integrators are further added to the IDA-PB controller. Different from the previous research, the proposed method enables the decoupling of different-frequency components and the suppression of frequency leakage. Besides, the reactive power distribution coefficients are introduced to characterise the optimisation allocation of reactive power between arms. Finally, the effectiveness and superiority of the proposed control strategy are verified by both the simulation and experiment results.

Inspec keywords: AC-AC power convertors; control system synthesis; power transmission control; asymptotic stability; voltage-source convertors; power system interconnection; reactive power control; optimisation; power system stability

Other keywords: global stability; mathematical model; reactive power allocation optimisation; vector control scheme; Y-connected modular multilevel converter; controller design; control strategy; port-controlled Hamiltonian model; asymptotical stability; steady-state error elimination; interconnection and damping assignment passivity-based control method; Y-MMC; direct AC-AC power conversion; fractional-frequency transmission system; reactive power distribution coefficient; IDA-PB control; frequency leakage suppression

Subjects: AC-AC power convertors; Control of electric power systems; Stability in control theory; Control system analysis and synthesis methods; Power transmission, distribution and supply; Optimisation techniques; Power and energy control; Optimisation techniques; Power system management, operation and economics

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