In view of the serious reactive power loss in the rural network, improved ant colony optimization algorithm （ACOA） was used to optimize the reactive power compensation for the rural distribution system. In this stud...In view of the serious reactive power loss in the rural network, improved ant colony optimization algorithm （ACOA） was used to optimize the reactive power compensation for the rural distribution system. In this study, the traditional ACOA was improved in two aspects： one was the local search strategy, and the other was pheromone mutation and re-initialization strategies. The reactive power optimization for a county＇s distribution network showed that the improved ACOA was practicable.展开更多
Electric power is widely used as the main energy source of ship integrated power system(SIPS), which contains power network and electric power network. SIPS network reconfiguration is a non-linear large-scale problem....Electric power is widely used as the main energy source of ship integrated power system(SIPS), which contains power network and electric power network. SIPS network reconfiguration is a non-linear large-scale problem. The reconfiguration solution influences the safety and stable operation of the power system. According to the operational characteristics of SIPS, a simplified model of power network and a mathematical model for network reconfiguration are established. Based on these models, a multi-agent and ant colony optimization(MAACO) is proposed to solve the problem of network reconfiguration. The simulations are carried out to demonstrate that the optimization method can reconstruct the integrated power system network accurately and efficiently.展开更多
灵活应用电转气(power to gas,P2G)系统中电解水和甲烷化两阶段产出的氢气和甲烷可促进综合能源系统(integratedenergysystem,IES)消纳盈余可再生能源。传统P2G系统只考虑将甲烷作为燃气机组的燃料,未充分利用氢气高电解率的特性,造成...灵活应用电转气(power to gas,P2G)系统中电解水和甲烷化两阶段产出的氢气和甲烷可促进综合能源系统(integratedenergysystem,IES)消纳盈余可再生能源。传统P2G系统只考虑将甲烷作为燃气机组的燃料,未充分利用氢气高电解率的特性,造成能量梯级转化次数增加,能量损耗提高。应用P2G系统两阶段分别产出的氢气和甲烷耦合气网注氢(hydrogen injection into gas grid,HIGG)技术以促进IES中可再生能源的消纳。基于能量枢纽的概念,将IES系统经济性优化调度转化为混合整数规划问题进行求解。通过两个场景的仿真分析说明,相比于仅应用甲烷的传统P2G系统,IES系统中应用P2G和HIGG技术能够降低部分能量梯级转化次数和成本投入,在经济性、环保性方面都有显著提高。展开更多
基于电网换相换流器(line commutation converter,LCC)的特高压直流输电系统(ultra-high voltage direct current,UHVDC)是远距离大容量输电的主要技术手段。为尽可能避免系统稳定裕度不足带来的直流降功率事件,提出一种频率偏差与电压...基于电网换相换流器(line commutation converter,LCC)的特高压直流输电系统(ultra-high voltage direct current,UHVDC)是远距离大容量输电的主要技术手段。为尽可能避免系统稳定裕度不足带来的直流降功率事件,提出一种频率偏差与电压刚度约束下的多直流馈入受端电网优化调度方法。首先,基于一次调频模型,推导出频率稳定性对系统中最大直流输送功率的约束条件;其次,提出评价多直流同时换相失败恢复特性的电压刚度指标,并基于该指标建立多直流馈入受端电网的电压稳定约束;然后,综合考虑频率和电压稳定约束以及多种运行约束的情况下,建立多直流馈入受端电网优化调度模型;最后,在一个改进的IEEE 39节点系统中进行测试。结果表明,所提方法能够通过改变开机方式和直流功率,保证系统频率和电压稳定性满足要求,避免强直弱交带来的安全稳定风险。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
基金Supported by China Postdoctoral Science Foundation(20090460873)
文摘In view of the serious reactive power loss in the rural network, improved ant colony optimization algorithm （ACOA） was used to optimize the reactive power compensation for the rural distribution system. In this study, the traditional ACOA was improved in two aspects： one was the local search strategy, and the other was pheromone mutation and re-initialization strategies. The reactive power optimization for a county＇s distribution network showed that the improved ACOA was practicable.
基金supported by the National Natural Science Foundation of China (4177402141974005)。
文摘Electric power is widely used as the main energy source of ship integrated power system(SIPS), which contains power network and electric power network. SIPS network reconfiguration is a non-linear large-scale problem. The reconfiguration solution influences the safety and stable operation of the power system. According to the operational characteristics of SIPS, a simplified model of power network and a mathematical model for network reconfiguration are established. Based on these models, a multi-agent and ant colony optimization(MAACO) is proposed to solve the problem of network reconfiguration. The simulations are carried out to demonstrate that the optimization method can reconstruct the integrated power system network accurately and efficiently.
文摘灵活应用电转气(power to gas,P2G)系统中电解水和甲烷化两阶段产出的氢气和甲烷可促进综合能源系统(integratedenergysystem,IES)消纳盈余可再生能源。传统P2G系统只考虑将甲烷作为燃气机组的燃料,未充分利用氢气高电解率的特性,造成能量梯级转化次数增加,能量损耗提高。应用P2G系统两阶段分别产出的氢气和甲烷耦合气网注氢(hydrogen injection into gas grid,HIGG)技术以促进IES中可再生能源的消纳。基于能量枢纽的概念,将IES系统经济性优化调度转化为混合整数规划问题进行求解。通过两个场景的仿真分析说明,相比于仅应用甲烷的传统P2G系统,IES系统中应用P2G和HIGG技术能够降低部分能量梯级转化次数和成本投入,在经济性、环保性方面都有显著提高。
文摘基于电网换相换流器(line commutation converter,LCC)的特高压直流输电系统(ultra-high voltage direct current,UHVDC)是远距离大容量输电的主要技术手段。为尽可能避免系统稳定裕度不足带来的直流降功率事件,提出一种频率偏差与电压刚度约束下的多直流馈入受端电网优化调度方法。首先,基于一次调频模型,推导出频率稳定性对系统中最大直流输送功率的约束条件;其次,提出评价多直流同时换相失败恢复特性的电压刚度指标,并基于该指标建立多直流馈入受端电网的电压稳定约束;然后,综合考虑频率和电压稳定约束以及多种运行约束的情况下,建立多直流馈入受端电网优化调度模型;最后,在一个改进的IEEE 39节点系统中进行测试。结果表明,所提方法能够通过改变开机方式和直流功率,保证系统频率和电压稳定性满足要求,避免强直弱交带来的安全稳定风险。
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。
