Abstract
This paper studies the electromechanical transient model and the control strategy of line commutated converter (LCC) and modular multilevel converter (MMC) based decentralized hybrid High Voltage Direct Current (HVDC) Transmission systems. The decentralized hybrid HVDC system is a new type of topology, and the related electromechanical transient model and control strategy have not been studied well. In this paper, the electromechanical transient model of a decentralized hybrid HVDC system is devloped through mathematical deduction. This model can be easily implemented in electromechanical transient simulation software and meet the time domain simulation requirements of large-scale systems. Then, in order to ensure the safe absorption of the DC power under various conditions, an optimal power flow model considering the decentralized hybrid HVDC system is proposed. Finally, the electromechanical transient model proposed in this paper is verified by the electromagnetic transient model, and the control strategy is validated in a modified New England 39-bus system.
Highlights
In China, bulk power High Voltage Direct Current (HVDC) transmissions play an important role in the West-to-East Power Transmission Project [1]
The commutation failure of a line commutated converter (LCC) inverter will threaten the stability of receiving power grids [6], whereas a commutation failure will not occur in a modular multilevel converter (MMC)
Xiao et al [9] proposed an electromechanical transient model of the line commutated converter-modular multilevel converter (LCC-MMC) hybrid HVDC system, but all converters in a station can only be connected to one AC bus
Summary
In China, bulk power High Voltage Direct Current (HVDC) transmissions play an important role in the West-to-East Power Transmission Project [1]. Electromechanical transient models and control strategies of the centralized hybrid HVDC system have previously been studied [9,10]. The electromechanical transient model of the decentralized hybrid HVDC system needs to be studied urgently. Xiao et al [9] proposed an electromechanical transient model of the LCC-MMC hybrid HVDC system, but all converters in a station can only be connected to one AC bus. The electromechanical transient modeling of the decentralized hybrid HVDC system is studied and a control strategy is proposed to guarantee the safe flow of DC power. A parameter optimization strategy for the decentralized hybrid HVDC system is proposed to avoid DC power transmission obstruction in the receiving power system.
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