Investigating flexibility and stability boosting transmission expansion planning(TEP)methods can increase the renewable energy(RE)consumption of the power systems.In this study,we propose a bi-level TEP method for vol...Investigating flexibility and stability boosting transmission expansion planning(TEP)methods can increase the renewable energy(RE)consumption of the power systems.In this study,we propose a bi-level TEP method for voltage-source-converter-based direct current(VSC-DC),focusing on flexibility and stability enhancement.First,we established the TEP framework of VSC-DC,by introducing the evaluation indices to quantify the power system flexibility and stability.Subsequently,we propose a bi-level VSC-DC TEP model:the upper-level model acquires the optimal VSC-DC planning scheme by using the improved moth flame optimization(IMFO)algorithm,and the lower-level model evaluates the flexibility through time-series production simulation.Finally,we applied the proposedVSC-DC TEPmethod to the modified IEEE-24 and IEEE-39 test systems,and obtained the optimalVSCDC planning schemes.The results verified that the proposed method can achieve excellent RE curtailment with high flexibility and stability.Furthermore,the well-designed IMFO algorithm outperformed the traditional particle swarm optimization(PSO)and moth flame optimization(MFO)algorithms,confirming the effectiveness of the proposed approach.展开更多
针对构网型变流器(grid-forming voltage source converter,GFM-VSC)的暂态稳定问题,现有研究大多忽略直流侧动态特性对GFM-VSC暂态稳定特性的影响,分析结果偏于乐观。因此,该文以考虑直流侧动态的GFM-VSC并网系统为研究对象,揭示直流...针对构网型变流器(grid-forming voltage source converter,GFM-VSC)的暂态稳定问题,现有研究大多忽略直流侧动态特性对GFM-VSC暂态稳定特性的影响,分析结果偏于乐观。因此,该文以考虑直流侧动态的GFM-VSC并网系统为研究对象,揭示直流电压动态主导的新型暂态失稳机理并提出相应改进方法。首先,构建含储能电池和直流电容的GFM-VSC并网系统大扰动分析模型;然后,利用等面积法与相平面图法,揭示流储能设备能量未受限与受限状态下GFM-VSC的暂态稳定机理;其次,分析储能电池容量、直流母线电容及电流限幅环节等各类关键因素对系统暂态稳定特性的影响,并给出相应改进方法;最后,利用电磁暂态仿真验证该文机理分析与改进方法的正确性与有效性。展开更多
基金supported by the Science and Technology Project of Central China Branch of State Grid Corporation of China under Grant 52140023000T.
文摘Investigating flexibility and stability boosting transmission expansion planning(TEP)methods can increase the renewable energy(RE)consumption of the power systems.In this study,we propose a bi-level TEP method for voltage-source-converter-based direct current(VSC-DC),focusing on flexibility and stability enhancement.First,we established the TEP framework of VSC-DC,by introducing the evaluation indices to quantify the power system flexibility and stability.Subsequently,we propose a bi-level VSC-DC TEP model:the upper-level model acquires the optimal VSC-DC planning scheme by using the improved moth flame optimization(IMFO)algorithm,and the lower-level model evaluates the flexibility through time-series production simulation.Finally,we applied the proposedVSC-DC TEPmethod to the modified IEEE-24 and IEEE-39 test systems,and obtained the optimalVSCDC planning schemes.The results verified that the proposed method can achieve excellent RE curtailment with high flexibility and stability.Furthermore,the well-designed IMFO algorithm outperformed the traditional particle swarm optimization(PSO)and moth flame optimization(MFO)algorithms,confirming the effectiveness of the proposed approach.
文摘针对构网型变流器(grid-forming voltage source converter,GFM-VSC)的暂态稳定问题,现有研究大多忽略直流侧动态特性对GFM-VSC暂态稳定特性的影响,分析结果偏于乐观。因此,该文以考虑直流侧动态的GFM-VSC并网系统为研究对象,揭示直流电压动态主导的新型暂态失稳机理并提出相应改进方法。首先,构建含储能电池和直流电容的GFM-VSC并网系统大扰动分析模型;然后,利用等面积法与相平面图法,揭示流储能设备能量未受限与受限状态下GFM-VSC的暂态稳定机理;其次,分析储能电池容量、直流母线电容及电流限幅环节等各类关键因素对系统暂态稳定特性的影响,并给出相应改进方法;最后,利用电磁暂态仿真验证该文机理分析与改进方法的正确性与有效性。
