配电系统中无功负载的投切会使公共耦合点(point of common coupling,PCC)电压发生波动。为了提高配电网的电压质量,该文详细分析了基于模块化多电平换流器的静止同步补偿器(static synchronous compensator-modular multilevel convert...配电系统中无功负载的投切会使公共耦合点(point of common coupling,PCC)电压发生波动。为了提高配电网的电压质量,该文详细分析了基于模块化多电平换流器的静止同步补偿器(static synchronous compensator-modular multilevel converters,MMC-STATCOM)的PCC电压调节原理,采用带有无功电流指令值反馈环路的PCC电压下垂控制方法,根据输出无功电流指令乘以可控的变换器等效阻抗以实时修正PCC电压参考值。与传统的基于输出无功电流反馈值的下垂控制方法相比,该文提出的下垂调节方法不受电流内环控制性能的影响,PCC电压可以根据装置补偿容量与负载特性在可以接受的一定范围内波动。同时,MMC-STATCOM采用3个环路的均压控制策略以维持每个子模块的电容电压平衡。基于Matlab/Simulink平台的仿真结果,以及基于60 V/2 k VA实验样机的实验结果,验证了该文PCC电压下垂控制方法的正确性与有效性。展开更多
With the increasing demand for electrical services,wind farm layout optimization has been one of the biggest challenges that we have to deal with.Despite the promising performance of the heuristic algorithm on the rou...With the increasing demand for electrical services,wind farm layout optimization has been one of the biggest challenges that we have to deal with.Despite the promising performance of the heuristic algorithm on the route network design problem,the expressive capability and search performance of the algorithm on multi-objective problems remain unexplored.In this paper,the wind farm layout optimization problem is defined.Then,a multi-objective algorithm based on Graph Neural Network(GNN)and Variable Neighborhood Search(VNS)algorithm is proposed.GNN provides the basis representations for the following search algorithm so that the expressiveness and search accuracy of the algorithm can be improved.The multi-objective VNS algorithm is put forward by combining it with the multi-objective optimization algorithm to solve the problem with multiple objectives.The proposed algorithm is applied to the 18-node simulation example to evaluate the feasibility and practicality of the developed optimization strategy.The experiment on the simulation example shows that the proposed algorithm yields a reduction of 6.1% in Point of Common Coupling(PCC)over the current state-of-the-art algorithm,which means that the proposed algorithm designs a layout that improves the quality of the power supply by 6.1%at the same cost.The ablation experiments show that the proposed algorithm improves the power quality by more than 8.6% and 7.8% compared to both the original VNS algorithm and the multi-objective VNS algorithm.展开更多
以风电场公共耦合点(Point of common coupling,PCC)运行特性一致为目标,提出了一种基于直驱风机箱变阀侧输入阻抗不变的改进等值方法。以箱变阀侧电气元件输入阻抗不变为原则,结合设定的目标额定容量,计算箱变阀侧及发电机机端额定电压...以风电场公共耦合点(Point of common coupling,PCC)运行特性一致为目标,提出了一种基于直驱风机箱变阀侧输入阻抗不变的改进等值方法。以箱变阀侧电气元件输入阻抗不变为原则,结合设定的目标额定容量,计算箱变阀侧及发电机机端额定电压,进而得出各电气元件等值参数。以某直驱风电场为例,考虑集电线路的化简,在实时数字仿真系统中分别搭建12台参数相同的2.5 MW多机详细模型、1台30 MW单机常规等值模型及1台30 MW单机改进等值模型,通过仿真对比3个模型在PCC点的动态特性。结果表明,3个模型的运行特性基本一致,证实该等值方法能准确反映PCC点的动态特性。展开更多
The islanded mode is one of the connection modes of the grid distributed generation resources.In this study,a distributed generation resource is connected to linear and nonlinear loads via a three-phase inverter where...The islanded mode is one of the connection modes of the grid distributed generation resources.In this study,a distributed generation resource is connected to linear and nonlinear loads via a three-phase inverter where a control method needing no current sensors or compensator elements is applied to the distribute generation system in the islanded mode.This control method has two main loops in each phase.The first loop controls the voltage control loops that adjust the three-phase point of common coupling,the amplitude of the non-sinusoidal reference waveform and the near-state pulse width modulation(NSPWM)method.The next loop compensates the harmonic compensator loop that calculates the voltage harmonics of the point of common coupling in each phase,and injects them to compensate the non-sinusoidal reference waveforms of each phase.The simulation results in MATLAB/SIMULINK show that this method can generate balanced threephase sinusoidal voltage with an acceptable total harmonic distortion(THD)at the joint connection point.展开更多
为了满足光伏电站并网对公共连接点(Point of common coupling,PCC)无功电压控制要求,基于九区图原理,以PCC电压和功率因数均合格为最优控制目标,针对PQ电源型和PV电源型的大型光伏电站提出了的无功电压控制策略。搭建了PQ电源型和PV电...为了满足光伏电站并网对公共连接点(Point of common coupling,PCC)无功电压控制要求,基于九区图原理,以PCC电压和功率因数均合格为最优控制目标,针对PQ电源型和PV电源型的大型光伏电站提出了的无功电压控制策略。搭建了PQ电源型和PV电源型大型光伏电站的等效模型,给出光伏电站无功电压控制策略实施流程图。以典型光伏电站出力和负荷动态变化为基础,通过搭建一个含大型并网光伏电站的110 kV系统,对光伏电站的无功电压控制进行仿真。仿真结果验证了所提策略的有效性和实用性。展开更多
文摘配电系统中无功负载的投切会使公共耦合点(point of common coupling,PCC)电压发生波动。为了提高配电网的电压质量,该文详细分析了基于模块化多电平换流器的静止同步补偿器(static synchronous compensator-modular multilevel converters,MMC-STATCOM)的PCC电压调节原理,采用带有无功电流指令值反馈环路的PCC电压下垂控制方法,根据输出无功电流指令乘以可控的变换器等效阻抗以实时修正PCC电压参考值。与传统的基于输出无功电流反馈值的下垂控制方法相比,该文提出的下垂调节方法不受电流内环控制性能的影响,PCC电压可以根据装置补偿容量与负载特性在可以接受的一定范围内波动。同时,MMC-STATCOM采用3个环路的均压控制策略以维持每个子模块的电容电压平衡。基于Matlab/Simulink平台的仿真结果,以及基于60 V/2 k VA实验样机的实验结果,验证了该文PCC电压下垂控制方法的正确性与有效性。
基金supported by the Natural Science Foundation of Zhejiang Province(LY19A020001).
文摘With the increasing demand for electrical services,wind farm layout optimization has been one of the biggest challenges that we have to deal with.Despite the promising performance of the heuristic algorithm on the route network design problem,the expressive capability and search performance of the algorithm on multi-objective problems remain unexplored.In this paper,the wind farm layout optimization problem is defined.Then,a multi-objective algorithm based on Graph Neural Network(GNN)and Variable Neighborhood Search(VNS)algorithm is proposed.GNN provides the basis representations for the following search algorithm so that the expressiveness and search accuracy of the algorithm can be improved.The multi-objective VNS algorithm is put forward by combining it with the multi-objective optimization algorithm to solve the problem with multiple objectives.The proposed algorithm is applied to the 18-node simulation example to evaluate the feasibility and practicality of the developed optimization strategy.The experiment on the simulation example shows that the proposed algorithm yields a reduction of 6.1% in Point of Common Coupling(PCC)over the current state-of-the-art algorithm,which means that the proposed algorithm designs a layout that improves the quality of the power supply by 6.1%at the same cost.The ablation experiments show that the proposed algorithm improves the power quality by more than 8.6% and 7.8% compared to both the original VNS algorithm and the multi-objective VNS algorithm.
文摘以风电场公共耦合点(Point of common coupling,PCC)运行特性一致为目标,提出了一种基于直驱风机箱变阀侧输入阻抗不变的改进等值方法。以箱变阀侧电气元件输入阻抗不变为原则,结合设定的目标额定容量,计算箱变阀侧及发电机机端额定电压,进而得出各电气元件等值参数。以某直驱风电场为例,考虑集电线路的化简,在实时数字仿真系统中分别搭建12台参数相同的2.5 MW多机详细模型、1台30 MW单机常规等值模型及1台30 MW单机改进等值模型,通过仿真对比3个模型在PCC点的动态特性。结果表明,3个模型的运行特性基本一致,证实该等值方法能准确反映PCC点的动态特性。
基金International Research Partnership“Electrical Engineering-Thai French Research Center(EE-TFRC)”under the project framework of the Lorraine Universitéd’Excellence(LUE)in cooperation between Universitéde Lorraine and King Mongkut’s University of Technology North Bangkok and in part by the National Research Council of Thailand(NRCT)under Senior Research Scholar Program under Grant No.N42A640328National Science,Research and Innovation Fund(NSRF)under King Mongkut’s University of Technology North Bangkok under Grant No.KMUTNB-FF-65-20.
文摘The islanded mode is one of the connection modes of the grid distributed generation resources.In this study,a distributed generation resource is connected to linear and nonlinear loads via a three-phase inverter where a control method needing no current sensors or compensator elements is applied to the distribute generation system in the islanded mode.This control method has two main loops in each phase.The first loop controls the voltage control loops that adjust the three-phase point of common coupling,the amplitude of the non-sinusoidal reference waveform and the near-state pulse width modulation(NSPWM)method.The next loop compensates the harmonic compensator loop that calculates the voltage harmonics of the point of common coupling in each phase,and injects them to compensate the non-sinusoidal reference waveforms of each phase.The simulation results in MATLAB/SIMULINK show that this method can generate balanced threephase sinusoidal voltage with an acceptable total harmonic distortion(THD)at the joint connection point.
文摘为了满足光伏电站并网对公共连接点(Point of common coupling,PCC)无功电压控制要求,基于九区图原理,以PCC电压和功率因数均合格为最优控制目标,针对PQ电源型和PV电源型的大型光伏电站提出了的无功电压控制策略。搭建了PQ电源型和PV电源型大型光伏电站的等效模型,给出光伏电站无功电压控制策略实施流程图。以典型光伏电站出力和负荷动态变化为基础,通过搭建一个含大型并网光伏电站的110 kV系统,对光伏电站的无功电压控制进行仿真。仿真结果验证了所提策略的有效性和实用性。
