Abstract
Multi-terminal high voltage direct current transmission based on voltage source converter (VSC-HVDC) grids can connect non-synchronous alternating current (AC) grids to a hybrid alternating current and direct current (AC/DC) power system, which is one of the key technologies in the construction of smart grids. However, it is still a problem to control the converter to achieve the function of each AC system sharing the reserve capacity of the entire network. This paper proposes an improved control strategy based on the slope control of the DC voltage and AC frequency (V–f slope control), in which the virtual inertia is introduced. This method can ensure that each AC sub-system shares the primary frequency control function. Additionally, with the new control method, it is easy to apply the secondary frequency control method of traditional AC systems to AC/DC hybrid systems to achieve the steady control of the DC voltage and AC frequency of the whole system. Most importantly, the new control method is better than the traditional control method in terms of dynamic performance. In this paper, a new control method is proposed, and the simulation model has been established in Matlab/Simulink to verify the effectiveness of the proposed control method.
Highlights
In recent years, wind, solar, and other new energy technologies have developed rapidly
This paper proposes an improved control strategy based on the slope control of the DC voltage
This paper proposes an improved control strategy based on the slope control of the DC voltage and alternating current (AC) frequency (V–f slope control), in which the virtual inertia is introduced
Summary
Wind, solar, and other new energy technologies have developed rapidly. The purpose of traditional small-scale power grids interconnecting to larger grids is to enable each small grid to share the moment of inertia and frequency regulation function They can support or act as a standby for each other to make the whole system more stable. DC voltage power droop with the AC frequency power droop [1,23,24,25] It can sustain DC voltage and provide the primary frequency control function to a sub-AC grid [16,17,18]. This paper proposes an improved control strategy based on the slope control of the DC voltage and AC frequency (V–f slope control), in which the virtual inertia is introduced.
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