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中文摘要：
针对海上风场并网电压源直流输电系统,设计了基于虚拟磁链的直接功率控制（DPC）方法,通过虚拟磁链技术计算系统功率,省去了电压传感器和锁相环,实现了无交流电压传感器运行,提高了系统可靠性,降低了成本。同时,针对常规DPC的功率滞环造成变流器开关频率变化范围大、系统滤波器设计困难及对处理器运算速度要求高等不足,利用三相电压源变流器的虚拟磁链模型和功率模型估计磁链和功率,通过功率误差直接计算电压参考信号,生成SPWM调制波,既替代滞环控制又避免内环PI调节器参数的整定。利用Matlab/Simulink搭建相应的仿真模型,结果表明两端变流器均可无交流电压传感器运行,需调整参数较少,且具有较快的响应速度和稳态跟踪精度,因此所设计系统正确有效。
英文摘要：
DPC（Direct Power Control） is designed for the grid-connected VSC-HVDC system of offshore wind farm,which applies the virtual flux technology to calculate the system power.The AC voltage sensors and PLL are saved to increase system reliability and decrease cost.The power and virtual flux models of three-phase VSC are constructed to estimate flux and power.The voltage reference signal is directly calculated according to the error of power,and the SPWM wave is generated to replace the hysteresis control and avoid the PI parameter adjustment of internal control loop.The results of simulation with Matlab/Simulink indicate that,the converters at both sides can operate without AC voltage sensors,and the system needs less parameter adjustment and has fast response speed and high steady-state tracking accuracy.
同期刊论文项目
同项目期刊论文
Characteristic Analysis Of Frequency Responsing of Doubly Fed Induction Generator-Based Wind Turbine
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