Abstract
With large-scale access to distributed power sources in medium and low-voltage distribution networks, the problem of insufficient local consumption capacity and source-charge mismatch in medium- and low-voltage distribution stations has become increasingly prominent. Power transfer and control strategies based on a flexible interconnection device (FID) for a distribution area near a particular geographical location are studied in this paper. A two-terminal distribution network model with tidal current complementarity is built based on a back-to-back (B2B) FID. A multi-mode operation method is proposed for power conversion under normal operation and power recovery under failure of one side, and a smooth switching strategy based on multiple control modes is also presented. Using this smooth switching method, an inverter controller is designed to form an integrated control unit. Finally, a simulation model of the distribution area with FID is built, and simulations of power transfer and mode switching under different working conditions are carried out. The correctness and effectiveness of the proposed method are verified.
Highlights
As an important part of the power grid, the distribution network directly faces power users, and its mode of operation and any changes in state will affect the users’ electricity consumption [1]-[3]
The development and application of energy storage devices means that electrical energy that is not consumed in real time can be stored [12], [13], due to the investment costs and the energy storage capacity of some low-voltage power distribution stations, energy storage devices often cannot solve the fundamental problem of source-charge mismatch
In this paper, power transfer and fault recovery of a distribution network based on a B2B flexible interconnection device (FID) are studied
Summary
As an important part of the power grid, the distribution network directly faces power users, and its mode of operation and any changes in state will affect the users’ electricity consumption [1]-[3]. Under normal operating conditions, based on flexible DC interconnection technology, a double-terminal control strategy using a B2B FID is proposed that offers a power transfer method suitable for medium and low-voltage distribution areas. After the action of the relay protection device in different situations is established, the fault recovery method of the distribution network area with FID is shown in Fig.. In the case where terminal B fails and is cut off, if the control strategy of VSC2 is switched to VF control only by referring to mode B, the B2B converter will form PQ+VF control At this time, the intermediate capacitor link loses the voltage regulation mechanism, which will cause a large drop in the DC voltage, and cause the power failure to recover from the power loss terminal. The angle is integrated based on the angle of the voltage phase at the moment before switching, as follows: θ
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