| 引用本文: | 郭紫昱,林涛,王立永,翟学,徐遐龄.逆变侧交流电压畸变下HVDC运行特性分析[J].电力自动化设备,2017,37(8): |
| GUO Ziyu,LIN Tao,WANG Liyong,ZHAI Xue,XU Xialing.Influence of inverter-side AC-voltage distortion on HVDC system[J].Electric Power Automation Equipment,2017,37(8): |
|
| 摘要: |
| 推导了逆变侧交流母线电压存在畸变时锁相环的输出特性和阀换相特性，揭示了谐波电压对逆变侧定熄弧角控制器和低压限电流控制器(VDCOL)带来影响的机理，解释了谐波电压的存在会减小逆变侧延迟触发角的指令值、降低直流系统传输容量的原因。针对交流母线电压谐波畸变情况下定熄弧角控制不能很好跟踪其整定值的问题，通过减小电流偏差控制的增益，有效减小定熄弧角控制在交流电压畸变时的稳态误差量，降低了传递容量的损失。提出了谐波影响下直流系统稳态工作点的计算方法。PSCAD/EMTDC仿真验证了理论分析的正确性、改进措施的有效性和计算方法的准确性。 |
| 关键词: HVDC输电 交流电压 谐波分析 锁相环 定熄弧角控制 低压限电流控制器 |
| DOI：10.16081/j.issn.1006-6047.2017.08.000 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金面上项目(51177111)；太阳能高效利用湖北省协同创新中心重大专项(HBSZD2014003) |
|
| Influence of inverter-side AC-voltage distortion on HVDC system |
|
GUO Ziyu1,2, LIN Tao1,2, WANG Liyong3, ZHAI Xue1,2, XU Xialing4
|
|
1.School of Electrical Engineering, Wuhan University, Wuhan 430072, China;2.Solar Energy Efficient Use Collaborative Innovation Center of Hubei Province, Wuhan 430072, China;3.State Grid Beijing Electric Power Company, Beijing 100031, China;4.Central China Electric Power Dispatching and Communication Center, Wuhan 430072, China
|
| Abstract: |
| The PLL(Phase Locked Loop) output performance and the valve commutation characteristics under the AC-bus voltage distortion of inverter side are deduced to reveal the mechanism of influence brought by the harmonic voltage on the inverter-side CEA(Constant Extinction Angle) controller and VDCOL(Voltage-Dependent Current Order Limiter) and to explain why the harmonic voltage may reduce the reference of inverter-side triggering angel and the transmission capacity of DC system. As the CEA control cannot properly follow its setting under the AC-bus voltage distortion, the gain of current deviation control is reduced to effectively decrease the steady-state error of CEA control and the loss of transfer capacity under the AC-bus voltage distortion. A method for calculating the steady-state operating point of DC system is proposed. PSCAD/EMTDC simulation verifies the correctness of theoretical analysis, the effectiveness of the improved method and the accuracy of calculation method. |
| Key words: HVDC power transmission AC voltage harmonic analysis phase locked loops constant extinction angle control voltage-dependent current order limiter |
