请解释下面这段程序每一部分所起的作用：%%%%%%配电网潮流优化%%%%%%%% %%%%%%标幺值SB=100MVA,UB=12.66kV,二阶锥松弛%%%%%% %%%%%%MISOCP模型,分时段优化,并行计算%%%%%%%%%%%% clear clc tic; %%%%%IEEE33配电网数据%%%%%%%%%%%; Pload=[0.0004666666667,0.0005,0.0005666666667,0.0006333333333,0.0006666666667,0.0007333333333,0.0007666666667,0.0008,0.0008666666667,0.0009333333333,0.0009666666667,0.001,0.0009333333333,0.0008666666667,0.0008,0.0007,0.0006666666667,0.0007333333333,0.0008,0.0009333333333,0.0008666666667,0.0007333333333,0.0006,0.0005333333333;0.00042,0.00045,0.00051,0.00057,0.0006,0.00066,0.00069,0.00072,0.00078,0.00084,0.00087,0.0009,0.00084,0.00078,0.00072,0.00063,0.0006,0.00066,0.00072,0.00084,0.00078,0.00066,0.00054,0.00048;0.00056,0.0006,0.00068,0.00076,0.0008,0.00088,0.00092,0.00096,0.00104,0.00112,0.00116,0.0012,0.00112,0.00104,0.00096,0.00084,0.0008,0.00088,0.00096,0.00112,0.00104,0.00088,0.00072,0.00064;0.00028,0.0003,0.00034,0.00038,0.0004,0.00044,0.00046,0.00048,0.00052,0.00056,0.00058,0.0006,0.00056,0.00052,0.00048,0.00042,0.0004,0.00044,0.00048,0.00056,0.00052,0.00044,0.00036,0.00032;0.00028,0.0003,0.00034,0.00038,0.0004,0.00044,0.00046,0.00048,0.00052,0.00056,0.00058,0.0006,0.00056,0.00052,0.00048,0.00042,0.0004,0.00044,0.00048,0.00056,0.00052,0.00044,0.00036,0.00032;0.0009333333333,0.001,0.001133333333,0.001266666667,0.001333333333,0.001466666667,0.001533333333,0.0016,0.001733333333,0.001866666667,0.001933333333,0.002,0.001866666667,0.001733333333,0.0016,0.0014,0.001333333333,0.001466666667,0.0016,0.001866666667,0.001733333333,0.001466666667,0.0012,0.001066666667;0.0009333333333,0.001,0.001133333333,0.001266666667,0.001333333333,0.001466666667,0.001533333333,0.0016,0.001733333333,0.001866666667,0.001933333333,0.002,0.001866666667,0.001733333333,0.0016,0.0014,0.001333333333,0.001466666667,0.0016,0.001866666667,0.001733333333,0.001466666667,0.0012,0.001066666667;0.00028,0.0003,0.00034,0.00038,0.0004,0.00044,0.00046,0.00048,0.00052,0.00056,0.00058,0.0006,0.00056,0.00052,0.00048,0.00042,0.0004,0.00044,0.00048,0.00056,0.00052,0.00044,0.00036,0.00032;0.00028,0.0003,0.0003

这段程序是一个配电网潮流优化的模型，使用标幺值SB=100MVA,UB=12.66kV，采用二阶锥松弛MISOCP模型，分时段优化，并行计算。具体功能如下：

1. clear clc：清空命令窗口和工作空间。

2. tic：开始计时。

3. IEEE33配电网数据：Pload为33个节点的负荷功率，单位为MW，按列存储。

4. 配电网潮流优化：通过模型求解得到最优负荷功率分配和电压值。

5. 标幺值SB=100MVA,UB=12.66kV：SB为基准功率，UB为基准电压。

6. 二阶锥松弛：将潮流约束条件转化为二次约束，以便使用二阶锥松弛算法进行求解。

7. MISOCP模型：采用多段分时段优化的方法，将时段内的潮流约束转化为二次约束，以便使用二阶锥松弛算法进行求解。

8. 并行计算：采用并行计算的方法，提高了求解速度。

9. 代码中未完整给出，直接运行会报错。

相关问题

% 根据配电网的数据创建网络模型对象 network = createDistributionNetwork(DistributionNetworkData);

好的，根据您的要求，这里提供一个MATLAB的示例代码，用于根据配电网的数据创建网络模型对象：

function network = createDistributionNetwork(DistributionNetworkData)
% 根据配电网的数据创建网络模型对象

% 创建节点对象
for i = 1:numel(DistributionNetworkData.Nodes)
    node = DistributionNetworkData.Nodes(i);
    network.Nodes(i) = struct('Name', node.Name, 'BusType', node.BusType, ...
        'Phases', node.Phases, 'NominalVoltage', node.NominalVoltage, ...
        'Coordinates', node.Coordinates, 'Load', node.Load);
end

% 创建线路对象
for i = 1:numel(DistributionNetworkData.Lines)
    line = DistributionNetworkData.Lines(i);
    network.Lines(i) = struct('Name', line.Name, 'FromNode', line.FromNode, ...
        'ToNode', line.ToNode, 'Length', line.Length, 'Phases', line.Phases, ...
        'Impedance', line.Impedance);
end

% 创建变压器对象
for i = 1:numel(DistributionNetworkData.Transformers)
    transformer = DistributionNetworkData.Transformers(i);
    network.Transformers(i) = struct('Name', transformer.Name, ...
        'FromNode', transformer.FromNode, 'ToNode', transformer.ToNode, ...
        'Impedance', transformer.Impedance, 'TapRatio', transformer.TapRatio);
end

% 创建网络模型对象
network = struct('Nodes', network.Nodes, 'Lines', network.Lines, ...
    'Transformers', network.Transformers);
end

这个函数的输入是一个配电网的数据结构 `DistributionNetworkData`，输出是一个网络模型对象 `network`，包含了该配电网的所有节点、线路和变压器的信息。您可以根据您的实际需求，修改和扩展这个函数。

%%判断电压是否越限

根据引用提出的方法，可以对含分布式电源的配电网电压越限薄弱环节进行识别。具体方法包括机理分析、确定导致电压越限可能的原因及其电压敏感度、定义压降比系数、计算各节点DG/负荷最大准入容量等步骤。同时，引用中提出的混合电压矢量预选方法也可以用于判断电压是否越限，该方法可以完全克服死区的影响，具有较高的准确性和可靠性。