In real industrial microgrids(MGs),the length of the primary delivery feeder to the connection point of the main substation is sometimes long.This reduces the power factor and increases reactive power absorption along...In real industrial microgrids(MGs),the length of the primary delivery feeder to the connection point of the main substation is sometimes long.This reduces the power factor and increases reactive power absorption along the primary delivery feeder from the external network.Besides,the giant induction electro-motors as the working horse of industries requires remarkable amounts of reactive power for electro-mechanical energy conversions.To reduce power losses and operating costs of the MG as well as to improve the voltage quality,this study aims at providing an insightful model for optimal placement and sizing of reactive power compensation capacitors in an industrial MG.In the presented model,the objective function considers voltage profile and network power factor improvement at the MG connection point.Also,it realizes power flow equations within which all operational security constraints are considered.Various reactive power compensation strategies including distributed group compensation,centralized compensation at the main substation,and distributed compensation along the primary delivery feeder are scrutinized.A real industrial MG,say as Urmia Petrochemical plant,is considered in numerical validations.The obtained results in each scenario are discussed in depth.As seen,the best performance is obtained when the optimal location and sizing of capacitors are simultaneously determined at the main buses of the industrial plants,at the main substation of the MG,and alongside the primary delivery feeder.In this way,74.81%improvement in power losses reduction,1.3%lower active power import from the main grid,23.5%improvement in power factor,and 37.5%improvement in network voltage deviation summation are seen in this case compared to the base case.展开更多
为了应对海量分布式资源分层分布接入柔性配电网给无功优化引入的不确定性,提出了基于概率场景驱动的柔性配电网分布式无功优化方法。首先,以最小化系统损耗为目标建立了柔性配电网无功优化模型,其次,综合考虑1-范数和∞-范数的置信约束...为了应对海量分布式资源分层分布接入柔性配电网给无功优化引入的不确定性,提出了基于概率场景驱动的柔性配电网分布式无功优化方法。首先,以最小化系统损耗为目标建立了柔性配电网无功优化模型,其次,综合考虑1-范数和∞-范数的置信约束,构建基于概率场景模糊集的柔性配电网分布鲁棒无功优化模型。在此基础上,以分布式优化模型为外部框架,采用一致性加速梯度交替方向乘子法(alternating direction method of multipliers,ADMM)进行全局协调与更新迭代求解,以各子区域分布鲁棒优化模型为内部框架,采用列与约束生成(column and constraint generation,CCG)算法求解。基于改进的IEEE-33节点系统的算例仿真结果表明,所提出的柔性配电网分布式无功优化方法具有较好的收敛性,兼顾了经济性和鲁棒性的平衡。展开更多
文摘In real industrial microgrids(MGs),the length of the primary delivery feeder to the connection point of the main substation is sometimes long.This reduces the power factor and increases reactive power absorption along the primary delivery feeder from the external network.Besides,the giant induction electro-motors as the working horse of industries requires remarkable amounts of reactive power for electro-mechanical energy conversions.To reduce power losses and operating costs of the MG as well as to improve the voltage quality,this study aims at providing an insightful model for optimal placement and sizing of reactive power compensation capacitors in an industrial MG.In the presented model,the objective function considers voltage profile and network power factor improvement at the MG connection point.Also,it realizes power flow equations within which all operational security constraints are considered.Various reactive power compensation strategies including distributed group compensation,centralized compensation at the main substation,and distributed compensation along the primary delivery feeder are scrutinized.A real industrial MG,say as Urmia Petrochemical plant,is considered in numerical validations.The obtained results in each scenario are discussed in depth.As seen,the best performance is obtained when the optimal location and sizing of capacitors are simultaneously determined at the main buses of the industrial plants,at the main substation of the MG,and alongside the primary delivery feeder.In this way,74.81%improvement in power losses reduction,1.3%lower active power import from the main grid,23.5%improvement in power factor,and 37.5%improvement in network voltage deviation summation are seen in this case compared to the base case.
文摘为了应对海量分布式资源分层分布接入柔性配电网给无功优化引入的不确定性,提出了基于概率场景驱动的柔性配电网分布式无功优化方法。首先,以最小化系统损耗为目标建立了柔性配电网无功优化模型,其次,综合考虑1-范数和∞-范数的置信约束,构建基于概率场景模糊集的柔性配电网分布鲁棒无功优化模型。在此基础上,以分布式优化模型为外部框架,采用一致性加速梯度交替方向乘子法(alternating direction method of multipliers,ADMM)进行全局协调与更新迭代求解,以各子区域分布鲁棒优化模型为内部框架,采用列与约束生成(column and constraint generation,CCG)算法求解。基于改进的IEEE-33节点系统的算例仿真结果表明,所提出的柔性配电网分布式无功优化方法具有较好的收敛性,兼顾了经济性和鲁棒性的平衡。
