VSC-HVDC offshore wind power system

Abstract

The invention discloses a VSC-HVDC offshore wind power system. The VSC-HVDC offshore wind power system comprises an offshore wind turbine generator set, a synchronous machine controller adopting a permanent magnet synchronous motor, and a VSC-HVDC system body comprising a VSC1 rectifying converter and a VSC2 inverse converter. The VSC-HVDC system adopts fuzzy PID inertial control and can be quickly adjusted according to parameter changes; and active output of the wind turbine generator is adjusted according to the control quantity, so that sudden change of power grid frequency is relieved to stabilize the power grid. A current instruction limiting unit VDCCOL is arranged in an outer ring active power controller of the VSC1 rectification converter. And the permanent magnet synchronous motoris controlled by adopting self-adaptive vector control. The system is high in power factor and low in energy consumption, the active output of the wind turbine generator can be effectively adjusted,unstable factors caused by sudden change of the frequency of the power grid to the power grid are relieved, and the inertia controllability of the wind turbine generator is greatly improved.

Description

Technical field[0001]The invention belongs to the technical field of offshore wind power generation, and relates to a VSC-HVDC offshore wind power system.Background technique[0002]Wind energy is a clean, renewable energy with great potential. Due to the abundant offshore wind energy resources and the feasibility of current technology, the ocean will become a rapidly developing wind power market. The sea area within 50m of the eastern coastal water depth of China is vast, and it is very close to the power load center such as the coastal economically developed power shortage area. With the development of offshore wind farm technology mature, wind power will surely become an important source of energy for sustainable development in the eastern coastal areas of China.[0003]However, wind energy is unstable and intermittent, and the output power of wind farms changes dynamically, which will adversely affect the grid-connected operation of wind power. The current grid-connection methods of...

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Problems solved by technology

However, the control required by LVTR technology cannot be achieved by only one control

Because the power transmission system is easily affected by the environment, when the wind power penetration power is high, the system stability is poor, so the power transmitted through the VSC-HVDC system will decrease, and the power accepted by the grid will decrease accordingly, or even the power will be too high lead to grid failure

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