Abstract
Modular multilevel converter-based high voltage direct current (MMC-HVDC) has a broad application prospect in renewable energy transmission. With the development of converter capacity, the transmission capacity calculation for MMC-HVDC grids becomes important for power dispatching. The existing method depends on manual work and is suitable for a simple grid. However, as the grid structure and operation modes become more and more complex, it becomes difficult to calculate the transmission capacity of different operation modes for an MMC-HVDC grid. This paper analyzed and simplified affecting factors and basic topologies. On this basis, a topology-based MMC-HVDC grid transmission capacity calculation method is proposed. First, an MMC-HVDC grid is divided into sending end grid, transmission section lines, and receiving end grid. Then the power limits of these three parts are calculated. Finally, the transmission capacity is determined by analyzing the connection mode of these three parts. This method can be adapted to any kind of MMC-HVDC grid and can be easily programmed.
Highlights
This paper focuses on the calculation method of transmission capacity suita different topologies of MMC-HVDC
This paper focuses on the calculation method of transmission capacity suitable for different topologies of MMC-HVDC
There needs to be one converter that works at DC voltage constant control mode for an MMC-HVDC grid [16], which is defined as the adjustment node
Summary
It is necessary to study the transmission capacity calculation method complex topology of MMC-HVDC grids. This paper focuses on the calculation method of transmission capacity suita different topologies of MMC-HVDC. The typical topology of MMCgrids is analyzed and the node types are divided On this basis, this paper simplif affecting factors and modes defines the section of the sending. Calculation method proposed bymay combining transmission capacity not to amention the more complexistopologies that exist in thethe future It is necessaryend, to study the transmission capacity calculation method formethod the complex sending receiving end, and section. This paper focuses on the calculation method of transmission capacity suitable for different topologies of MMC-HVDC. One is determined by the current and voltage limit of the device and is u a calculation method is proposed by combining the transmission capacity of the shown rated power.
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