Offshore flexible DC power transmission system voltage level and transmission capacity calculation method

Abstract

The present invention relates to an offshore flexible DC power transmission system voltage level and transmission capacity calculation method which comprises the following steps: (1) collecting original data comprising the economic level, geographical environment, electricity load characteristic and load forecasting data of a load area (2) determining flexible DC power transmission system voltage level and transmission capacity design scheme alternatives, (3) calculating the flexible DC power transmission system investment cost of each alternative, (4) calculating the flexible DC power transmission system operation cost of each alternative and converting the operation cost into the equivalent amount of investment and construction time, (5) calculating the flexible DC power transmission system reliability cost of each alternative and converting the cost into the equivalent amount of investment and construction time, (6) calculating the flexible DC power transmission system comprehensive cost of each alternative, and (7) selecting the alternative with the lowest comprehensive cost. According to the method, the construction cost, the operation cost and the reliability cost are fully considered, and the method can be widely applied to the offshore flexible DC power transmission system design.

Description

technical field [0001] The invention relates to a calculation method for a flexible direct current transmission system, in particular to a calculation method for voltage levels and transmission capacity of an offshore flexible direct current transmission system. Background technique [0002] Flexible direct current transmission (VSC-HVDC) technology uses fully controlled devices such as insulated gate bipolar transistors (IGBT) to form a voltage source converter (VSC), and uses pulse width modulation (PWM) technology to invert the DC voltage into amplitude and The AC voltage with controllable phase has many advantages. At present, the use of flexible DC transmission technology to realize the interconnection of cross-sea power grids has become the mainstream of submarine cable transmission projects around the world. [0003] The voltage level and transmission capacity design of the offshore flexible DC transmission system is a very important and meticulous work. It is usuall...

AI Technical Summary

Problems solved by technology

However, when using this method, the impact of operating costs on voltage levels and transmission capacity cannot be fully considered

Moreover, the load on the offshore drilling platform has high requirements for power supply reliability, but in the calculation method of the above-mentioned flexible DC transmission scheme, the reliability factor is generally considered as a constraint condition, and this method is difficult to reflect the impact of the reliability factor on the DC system. Economic Impact of Construction

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