KEYWORDS: Control systems, Power consumption, Power grids, Resistors, Capacitors, Wind energy, Design and modelling, Telecommunications, Medium wave, Systems modeling
This paper first analyzes the topology, parameter design and control strategy of the distributed DC chopper and improves its control strategy by proposing a calculation method for the number of input submodules. Based on the actual parameters of the Rudong offshore wind power flexible project, a system model was established in PSCAD/EMTDC. By comparing response curves of distributed DC chopper with existing control strategy and improved control strategy, it is shown that distributed DC chopper with improved control has a smooth energy consumption curve, the energy consumption power can be fully balanced with the actual power difference of the system, and the fault ride-through performance is more superior.
In offshore wind power flexible DC grid-connected systems, the surplus power generated after an AC grid fault can lead to DC overvoltage, and the surplus power is generally consumed through the configuration of DC chopper. This paper analyzed the topological structure, design of parameters and the control method of the distributed DC chopper. By comparing the response curves of the traditional centralized DC chopper, it is shown that the distributed DC chopper has more ideal control effect. On the basis of this, the AC-voltage magnitude reduction method was designed based on the permanent magnet direct-drive wind turbine, and the FRT coordination control strategy was designed in combination with the distributed DC chopper, which can significantly reduce the capacity of DC chopper and the cost of system while ensuring FRT performance of system. Based on the Rudong project, the proposed coordinated control strategy is verified by the system model built in PSCAD/EMTDC.
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