摘要
电压源换流器VSC(VoltageSourcedConverter)与传统高压直流输电(HVDC)换流器在物理模型和工作原理上有本质区别,因此传统的交直流系统潮流计算方法不能在VSC构成的多端直流输电系统VSC-MTDC(VSCMulti鄄TerminalHVDC)中直接使用。首先描述了MTDC潮流计算的数学模型,随后在综合VSC工作原理及控制方式的基础上,推导了适用于VSC-MTDC潮流计算的VSC数学模型。进而由换流器控制量M(调制度)和δ(PWM相位角)的不同组合,列出了4种运行控制方案,并针对每种控制方案给出了其交直流潮流交替求解的接口方程。最后以一含3个VSC的系统为例,对其中1个VSC的不同运行控制方案进行潮流分析,结果表明采用交替算法的潮流算法交直流接口简单清晰、程序编写方便且通用性好。
Since there is essential difference between VSC(Voltage Sourced Converter) and tradi-tional HVDC converters in both physical model and operating principle,the traditional power flow algorithm for AC - DC system can't be directly used in VSC - MTDC(VSC Multi-Terminal HVDC). The mathematical model of MTDC power flow calculation is described. The VSC model for VSC-MTDC power flow calculation is deduced based on the operating principle and control scheme of VSC. According to the combinations for control variables M(modulating degree) and δ (PWM phase),four kinds of control schemes are brought forward,and corresponding interface functions for AC - DC alternant calculation are provided. Taking a three-VSC system as an example,the power flows are analyzed with one VSC controlled by different schemes. The results show that the universal alter-nant power flow calculation is simple in interface and easy to program.
出处
《电力自动化设备》
EI
CSCD
北大核心
2005年第6期1-6,共6页
Electric Power Automation Equipment
