海上平台混合直流供电方案研究与仿真分析

  [目的]  海上平台一般均采用海上自供电方案，该供电方式电源形式单一、可拓展性差、抗冲击能力弱、供电可靠性和保障程度低，同时，海上平台的空间非常有限，建设自供电电源投资较高。  [方法]  在对比研究利用岸电交流送电和直流送电方案优缺点的基础上，提出了技术可行、经济性较优的海上平台采用混合直流输电的方案。在此基础上，建立陆地电网侧常规直流、海上平台侧柔性直流的数学模型，结合传统直流的换流器的典型控制方式和柔性直流换流器的典型控制方式，提出混合直流的控制策略。  [结果]  在PSCAD/EMTDC上建立混合柔性直流输电系统的电磁暂态仿真模型，包含近区交流电网、混合直流系统以及海上平台系统的仿真系统模型，并开展建模仿真分析研究，分析近区交流电网、直流系统、海上平台的运行特性、故障特性以及交互影响。  [结论]  研究成果对解决海上平台的安全可靠供电问题具有十分重要意义。

Research on Hybrid HVDC and Simulation of Offshore Platform

  [Introduction]  Offshore platforms generally use self-powered offshore solutions. The power supply has a single power source, poor scalability, weak impact resistance, and low reliability and reliability of power supply. At the same time, the space of the offshore platform is very limited, and the investment in building a self-powered power supply is relatively high.  [Method]  Based on a comparative study of the advantages and disadvantages of shoreline AC power transmission and DC power transmission schemes, this paper proposes a hybrid HVDC transmission scheme for a technically feasible and economical offshore platform. On this basis, this paper establishes the mathematical model of the conventional direct current and offshore platform side flexible DC on the land network. Combining the typical control method of the traditional HVDC converter and the typical control method of the flexible DC converter, a hybrid HVDC control strategy is proposed.  [Result]  An electromagnetic transient simulation model of a hybrid flexible HVDC transmission system is established on PSCAD/EMTDC, including simulation system models of near area AC grid, hybrid HVDC system and offshore platform system. Carry out modeling and simulation analysis and analysis.  [Conclusion]  The research results are very important to solve the safety and reliable power supply of offshore platform.