CN107508323B - An evaluation method and evaluation system for distributed photovoltaic access capability in low-voltage station area - Google Patents

An evaluation method and evaluation system for distributed photovoltaic access capability in low-voltage station area Download PDF

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CN107508323B
CN107508323B CN201710874616.5A CN201710874616A CN107508323B CN 107508323 B CN107508323 B CN 107508323B CN 201710874616 A CN201710874616 A CN 201710874616A CN 107508323 B CN107508323 B CN 107508323B
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胡列翔
郑伟民
张全明
沈梁
傅旭华
王蕾
王坤
张西竹
王强强
谈历
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State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Zhejiang Electric Power Co Ltd
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Abstract

本发明公开了一种低压台区分布式光伏接入能力评估方法及评估系统。现有低压配电网存在接入大量中小型分布式光伏，特别是户用光伏接入后的供电能力评估难的问题。本发明通过首段对末端节点的二端口网络等效，利用不同时刻的输入输出状态计算等效网络参数，在不获取低压台区内配电网络线路参数的情况下可计算分布式光伏对本节点和首段电压的影响，同时改变了以往增加多台变压器并列运行或采用并行新建分布式光伏专用配电网的简单规划设计方式，通过准确评估低压配电网的载流能力降低配电网总体投资。

Figure 201710874616

The invention discloses a method and an evaluation system for evaluating the access capability of distributed photovoltaics in a low-voltage station area. The existing low-voltage distribution network has the problem that it is difficult to access a large number of small and medium-sized distributed photovoltaics, especially the power supply capacity evaluation after household photovoltaics are connected. According to the invention, the first segment is equivalent to the two-port network of the end node, and the input and output states at different times are used to calculate the equivalent network parameters. At the same time, it has changed the simple planning and design method of adding multiple transformers in parallel or adopting parallel new distributed photovoltaic special distribution network in the past. By accurately evaluating the current carrying capacity of the low-voltage distribution network, the overall distribution network is reduced. invest.

Figure 201710874616

Description

Low-voltage distribution room distributed photovoltaic access capability assessment method and system
Technical Field
The invention belongs to the field of planning of distributed photovoltaic access low-voltage power distribution networks, and particularly relates to a low-voltage distribution area distributed photovoltaic access capacity evaluation method and system based on port equivalence.
Background
The poverty relief in China is rapid with the development of household distributed photovoltaic, the national grid company releases access to the distributed photovoltaic according to the national policy, but the access capacity is overlarge in the actual engineering, the intermittent fluctuation of the voltage of a distributed photovoltaic access area is increased, and partial voltage is out of limit, so that the public voltage quality in a low-voltage transformer area is influenced.
Therefore, relevant scholars in China carry out research on the aspects of a control mode of a distributed photovoltaic body, grid planning or local consumption of a medium-voltage side and the like, but neglect the planning of a power distribution network in a low-voltage distribution area, and lack the evaluation on the capability of accepting distributed photovoltaic by the low-voltage distribution area, so that excessive investment in engineering is caused, and if a plurality of transformers are added to operate in parallel or a parallel newly-built distributed photovoltaic special power distribution network is adopted, the problem that an effective evaluation tool is lacked in the investment of photovoltaic access to the low-voltage power distribution network is reflected.
Disclosure of Invention
The invention provides a low-voltage distribution network distributed photovoltaic access capacity evaluation method based on port equivalence, aiming at the problem that the existing low-voltage distribution network is difficult to evaluate the power supply capacity after a large number of medium-sized and small-sized distributed photovoltaics are accessed, particularly a user is accessed with photovoltaics, so that the current carrying capacity of the low-voltage distribution network is accurately evaluated, and the overall investment of the low-voltage distribution network is reduced.
Therefore, the invention adopts the following technical scheme: a low-voltage distribution area distributed photovoltaic access capacity evaluation method comprises the following steps:
1) selecting a low-voltage transformer area with photovoltaic power generation access, reading user numbers, active current, reactive current and voltage data of a user electric energy meter through a collector of the low-voltage transformer area, reading active current, reactive current and voltage data of a low-voltage side of a transformer through a distribution transformer monitoring terminal, requiring all data to be called once, ensuring the simultaneity of the data, and neglecting communication delay;
2) storing active current, reactive current, voltage data, user numbers and time scales of all single-phase or three-phase electric energy meters in the low-voltage transformer area called each time, and accurately measuring the time scales to be minutes;
3) reading and storing the current transformer transformation ratio of all single-phase or three-phase electric energy meters in the low-voltage transformer area, and taking the primary value as the maximum current I allowed to be accessed by the node Ii_max；
4) Inquiring user files according to user numbers of all single-phase or three-phase electric energy meters in the low-voltage distribution area, and determining the types of the users of the node i, including no power generation, spontaneous self-use and full-amount internet access;
5) taking the outgoing line position of a transformer in a low-voltage transformer area as a head end, acquiring active current, reactive current, voltage data, a user number and a time scale of a head section and a node i at 2 moments in stored data, wherein two groups of data are required to be different, and calculating equivalent two-port network parameters between the ith node and the head end;
6) active current, reactive current and voltage data of the first section of the spring-divided-day noon are selected, and the maximum current value I of the node I is comparedi_maxAs active current, setting reactive current as zero, calculating whether the voltage of a node i meets the upper and lower 10% deviation of 220V or not through the obtained equivalent two-port network parameters, if so, taking the voltage as the maximum current access capacity of the node, and if not, reducing the active current by taking 5% as step length until the voltage meets the maximum current access capacity of the node;
7) and according to the user types associated with the user numbers in the low-voltage transformer area, the sum of the maximum access current of photovoltaic-free power generation, full-rate internet surfing and spontaneous self-use is classified and counted, and the sum is used as the access capacity index of various users.
As a supplement to the above technical solution, in the step 5), the equivalent two-port network adopts a T-type network.
As a supplement to the above technical solution, the solution formula of the equivalent two-port network parameter is as follows:
Figure BDA0001417845910000031
in the formula (I), the compound is shown in the specification,
Figure BDA0001417845910000032
respectively at the first momentThe voltage and current values of the two ports,
Figure BDA0001417845910000033
Figure BDA0001417845910000034
the voltage and current values of the two ports at the second moment are respectively, the first subscript number of the symbol is a port number, and the second subscript number of the symbol is a moment number;
Z1，Z2，Z3three equivalent impedances for the T-network are shown.
As a supplement to the above technical solution, in step 6), the voltage of the node i is calculated by the following formula:
Figure BDA0001417845910000035
in the formula (I), the compound is shown in the specification,
Figure BDA0001417845910000036
the current flowing into the first port is controlled,
Figure BDA0001417845910000037
the current flowing into the second port or output port,
Figure BDA0001417845910000038
is the voltage of the second port.
As a supplement to the above technical solution, in the step 5), the specific content that two sets of data are required to be different is: and judging whether the relative difference value of the active current and the reactive current of the two groups of data is within 10%, if so, deleting one group, and reading a new group until the relative difference value of the active current and the reactive current of the two groups of data is more than or equal to 10%.
Another object of the present invention is to provide a low-voltage distribution grid area distributed photovoltaic access capability evaluation system, which includes:
a data reading module: selecting a low-voltage transformer area with photovoltaic power generation access, reading user numbers, active current, reactive current and voltage data of a user electric energy meter through a collector of the low-voltage transformer area, reading active current, reactive current and voltage data of a low-voltage side of a transformer through a distribution transformer monitoring terminal, requiring all data to be called once, ensuring the simultaneity of the data, and neglecting communication delay;
a data storage module: storing active current, reactive current, voltage data, user numbers and time scales of all single-phase or three-phase electric energy meters in the low-voltage transformer area called each time, and accurately measuring the time scales to be minutes;
the node is connected with a maximum current selection module: reading and storing the current transformer transformation ratio of all single-phase or three-phase electric energy meters in the low-voltage transformer area, and taking the primary value as the maximum current I allowed to be accessed by the node Ii_max；
A node user type determination module: inquiring user files according to user numbers of all single-phase or three-phase electric energy meters in the low-voltage distribution area, and determining the types of the users of the node i, including no power generation, spontaneous self-use and full-amount internet access;
the equivalent two-port network parameter calculation module: taking the outgoing line position of a transformer in a low-voltage transformer area as a head end, acquiring active current, reactive current, voltage data, a user number and a time scale of a head section and a node i at 2 moments in stored data, wherein two groups of data are required to be different, and calculating equivalent two-port network parameters between the ith node and the head end;
the current maximum access capability determining module: active current, reactive current and voltage data of the first section of the spring-divided-day noon are selected, and the maximum current value I of the node I is comparedi_maxAs active current, setting reactive current as zero, calculating whether the voltage of a node i meets the upper and lower 10% deviation of 220V or not through the obtained equivalent two-port network parameters, if so, taking the voltage as the maximum current access capacity of the node, and if not, reducing the active current by taking 5% as step length until the voltage meets the maximum current access capacity of the node;
an access capability index calculation module: and according to the user types associated with the user numbers in the low-voltage transformer area, the sum of the maximum access current of photovoltaic-free power generation, full-rate internet surfing and spontaneous self-use is classified and counted, and the sum is used as the access capacity index of various users.
The invention has the following beneficial effects: according to the invention, through the first section of two-port network equivalence of the terminal node, equivalent network parameters are calculated by using input and output states at different moments, the influence of distributed photovoltaic on the node and the first section of voltage can be calculated under the condition that the line parameters of a distribution network in a low-voltage transformer area are not obtained, meanwhile, the traditional simple planning design mode that a plurality of transformers are added to operate in parallel or a parallel newly-built distributed photovoltaic special distribution network is adopted is changed, and the overall investment of the distribution network is reduced by accurately evaluating the current carrying capacity of the low-voltage distribution network.
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FIG. 1 is a schematic diagram showing the structure of a T-type network in embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of embodiment 1 of the present invention.
Detailed Description
Example 1
The embodiment is a method for evaluating the distributed photovoltaic access capacity of a low-voltage transformer area, which comprises the following steps:
1) the method comprises the steps of selecting a low-voltage transformer area with photovoltaic power generation access, reading user numbers, active current, reactive current and voltage data of a user electric energy meter through a collector of the low-voltage transformer area, reading active current, reactive current and voltage data of a low-voltage side of a transformer through a distribution transformer monitoring terminal, calling all data at one time, ensuring the simultaneity of the data and neglecting communication delay.
2) And storing active current, reactive current, voltage data, user numbers and time scales of all single-phase or three-phase electric energy meters in the low-voltage transformer area called each time, and the accuracy is up to minutes.
3) Reading and storing the current transformer transformation ratio of all single-phase or three-phase electric energy meters in the low-voltage transformer area, and taking the primary value as the maximum current I allowed to be accessed by the node Ii_max。
4) And inquiring user files according to the user numbers of all single-phase or three-phase electric energy meters in the low-voltage distribution area, and determining the types of the users of the node i, including no power generation, spontaneous self-use and full-amount internet access.
5) Taking the outlet position of a transformer in a low-voltage transformer area as a head end, acquiring active current, reactive current, voltage data, a user number and a time scale of a head section and a node i at 2 moments in stored data, judging whether the relative difference value of the active current and the reactive current of two groups of data is within 10%, if so, deleting one group of the two groups of data, reading a new group of the two groups of data until the relative difference value of the active current and the reactive current of the two groups of data is more than or equal to 10%, and calculating equivalent two-port network parameters between the ith node and the head end; the equivalent two-port network adopts a T-type network, and the solving formula of the equivalent two-port network parameters is as follows:
Figure BDA0001417845910000061
in the formula (I), the compound is shown in the specification,
Figure BDA0001417845910000062
the voltage and current values of the two ports at the first moment,
Figure BDA0001417845910000063
Figure BDA0001417845910000064
the voltage and current values of the two ports at the second moment are respectively, the first subscript number of the symbol is a port number, and the second subscript number of the symbol is a moment number;
Z1，Z2，Z3three equivalent impedances for the T-network are shown.
6) Active current, reactive current and voltage data of the first section of the spring-divided-day noon are selected, and the maximum current value I of the node I is comparedi_maxAs active current, setting reactive current as zero, calculating whether the voltage of a node i meets the upper and lower 10% deviation of 220V or not through the obtained equivalent two-port network parameters, if so, taking the voltage as the maximum current access capacity of the node, and if not, reducing the active current by taking 5% as step length until the voltage meets the maximum current access capacity of the node; the voltage at node i is calculated by:
Figure BDA0001417845910000065
in the formula (I), the compound is shown in the specification,
Figure BDA0001417845910000066
the current flowing into the first port is controlled,
Figure BDA0001417845910000067
the current flowing into the second port or output port,
Figure BDA0001417845910000068
is the voltage of the second port.
7) And according to the user types associated with the user numbers in the low-voltage transformer area, the sum of the maximum access current of photovoltaic-free power generation, full-rate internet surfing and spontaneous self-use is classified and counted, and the sum is used as the access capacity index of various users.
Example 2
The embodiment is a low-voltage distribution room distributed photovoltaic access capability evaluation system, which includes:
a data reading module: selecting a low-voltage transformer area with photovoltaic power generation access, reading user numbers, active current, reactive current and voltage data of a user electric energy meter through a collector of the low-voltage transformer area, reading active current, reactive current and voltage data of a low-voltage side of a transformer through a distribution transformer monitoring terminal, requiring all data to be called once, ensuring the simultaneity of the data, and neglecting communication delay;
a data storage module: storing active current, reactive current, voltage data, user numbers and time scales of all single-phase or three-phase electric energy meters in the low-voltage transformer area called each time, and accurately measuring the time scales to be minutes;
the node is connected with a maximum current selection module: reading and storing the current transformer transformation ratio of all single-phase or three-phase electric energy meters in the low-voltage transformer area, and taking the primary value as the maximum current I allowed to be accessed by the node Ii_max；
A node user type determination module: inquiring user files according to user numbers of all single-phase or three-phase electric energy meters in the low-voltage distribution area, and determining the types of the users of the node i, including no power generation, spontaneous self-use and full-amount internet access;
the equivalent two-port network parameter calculation module: taking the outgoing line position of a transformer in a low-voltage transformer area as a head end, acquiring active current, reactive current, voltage data, a user number and a time scale of a head section and a node i at 2 moments in stored data, wherein two groups of data are required to be different, and calculating equivalent two-port network parameters between the ith node and the head end;
the current maximum access capability determining module: active current, reactive current and voltage data of the first section of the spring-divided-day noon are selected, and the maximum current value I of the node I is comparedi_maxAs active current, setting reactive current as zero, calculating whether the voltage of a node i meets the upper and lower 10% deviation of 220V or not through the obtained equivalent two-port network parameters, if so, taking the voltage as the maximum current access capacity of the node, and if not, reducing the active current by taking 5% as step length until the voltage meets the maximum current access capacity of the node;
an access capability index calculation module: and according to the user types associated with the user numbers in the low-voltage transformer area, the sum of the maximum access current of photovoltaic-free power generation, full-rate internet surfing and spontaneous self-use is classified and counted, and the sum is used as the access capacity index of various users.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims (10)

1.一种低压台区分布式光伏接入能力评估方法，其特征在于，包括如下步骤：1. a low-voltage platform area distributed photovoltaic access capability evaluation method, is characterized in that, comprises the steps: 1)选取具有光伏发电接入的低压台区，通过低压台区的采集器读取户用电能表的用户编号、有功电流、无功电流和电压数据，通过配变监测终端读取变压器低压侧有功电流、无功电流和电压数据，要求全部数据一次召唤，保证数据的同时性，忽略通信延迟；1) Select a low-voltage station area with photovoltaic power generation access, read the user number, active current, reactive current and voltage data of the household electric energy meter through the collector in the low-voltage station area, and read the transformer low-voltage through the distribution transformer monitoring terminal. For side active current, reactive current and voltage data, all data are required to be called at one time to ensure the synchronicity of data and ignore communication delay; 2)存储每次召唤的低压台区内所有单相或三相电能表的有功电流、无功电流、电压数据、用户编号及时标，精确到分钟；2) Store the active current, reactive current, voltage data, user number and time stamp of all single-phase or three-phase electric energy meters in the low-voltage station area for each call, accurate to the minute; 3)读取并存储低压台区内所有单相或三相电能表的电流互感器变比，将一次值作为节点i允许接入的最大电流Ii_max；3) read and store the current transformer transformation ratios of all single-phase or three-phase electric energy meters in the low-voltage platform area, and use the primary value as the maximum current I i_max that node i is allowed to access; 4)由低压台区内所有单相或三相电能表的用户编号查询用户档案，确定该节点i用户的类型，包括无光伏发电、自发自用及全额上网；4) Check the user files by the user numbers of all single-phase or three-phase electric energy meters in the low-voltage station area to determine the type of user i at this node, including no photovoltaic power generation, self-generated and self-use, and full Internet access; 5)以低压台区变压器出线处作为首端，在存储数据中获取2个时刻的首段和节点i的有功电流、无功电流、电压数据、用户编号及时标，要求两组数据不相同，计算第i个节点与首端之间的等效二端口网络参数；5) Take the outlet of the transformer in the low-voltage station area as the head end, and obtain the active current, reactive current, voltage data, user number and time stamp of the first section and node i at two moments in the stored data, and the two groups of data are required to be different. Calculate the equivalent two-port network parameters between the ith node and the head end; 6)选取春分日正午时刻的首段的有功电流、无功电流和电压数据，将节点i的最大电流值Ii_max作为有功电流，无功电流设为零，通过获得的等效二端口网络参数计算节点i的电压是否满足220V的上下10％偏差以内，如满足则作为该节点的电流最大接入能力，不满足则以5％为步长降低有功电流，直至满足；6) Select the active current, reactive current and voltage data of the first section at noon on the vernal equinox, take the maximum current value I i_max of node i as the active current, and set the reactive current to zero, and obtain the equivalent two-port network parameters by obtaining Calculate whether the voltage of node i meets the upper and lower 10% deviation of 220V. If it is satisfied, it will be regarded as the maximum current access capability of the node. If it is not satisfied, the active current will be reduced in steps of 5% until it is satisfied; 7)按低压台区内用户编号所关联的用户类型，分类统计无光伏发电、全额上网及自发自用的最大接入电流之和，将其作为各类用户的接入能力指标。7) According to the user type associated with the user number in the low-voltage station area, classify and count the sum of the maximum access current of no photovoltaic power generation, full Internet access and self-use, and use it as the access capability index of various users. 2.根据权利要求1所述的低压台区分布式光伏接入能力评估方法，其特征在于，所述的步骤5)中，等效二端口网络采用T型网络。2 . The method for evaluating the distributed photovoltaic access capability of a low-voltage station area according to claim 1 , wherein, in the step 5), the equivalent two-port network adopts a T-type network. 3 . 3.根据权利要求2所述的低压台区分布式光伏接入能力评估方法，其特征在于，所述等效二端口网络参数的求解公式如下：3. The method for evaluating the distributed photovoltaic access capability of a low-voltage station area according to claim 2, wherein the equation for solving the equivalent two-port network parameters is as follows:
Figure FDA0002312646450000021
Figure FDA0002312646450000021
 式中，
Figure FDA0002312646450000022
分别为第一个时刻二个端口的电压和电流值，
Figure FDA0002312646450000023
Figure FDA0002312646450000024
分别为第二个时刻二个端口的电压和电流值，符号的第一个下标编号为端口编号，符号的第二个下标编号为时刻编号；In the formula,
Figure FDA0002312646450000022
are the voltage and current values of the two ports at the first moment, respectively,
Figure FDA0002312646450000023
Figure FDA0002312646450000024
are the voltage and current values of the two ports at the second time, respectively, the first subscript number of the symbol is the port number, and the second subscript number of the symbol is the time number; Z1，Z2，Z3分别为T型网络的三个等效阻抗。Z 1 , Z 2 , and Z 3 are the three equivalent impedances of the T-type network, respectively. 4.根据权利要求3所述的低压台区分布式光伏接入能力评估方法，其特征在于，所述的步骤6)中，节点i的电压由下式计算得到：4. The method for evaluating the distributed photovoltaic access capability of a low-voltage station area according to claim 3, wherein in the step 6), the voltage of node i is calculated by the following formula:
Figure FDA0002312646450000025
Figure FDA0002312646450000025
 式中，
Figure FDA0002312646450000026
为第一端口流入的电流，
Figure FDA0002312646450000027
为第二端口流入的电流，
Figure FDA0002312646450000028
为第二端口即输出端口的电压。In the formula,
Figure FDA0002312646450000026
is the current flowing into the first port,
Figure FDA0002312646450000027
is the current flowing into the second port,
Figure FDA0002312646450000028
is the voltage of the second port, that is, the output port. 5.根据权利要求1所述的低压台区分布式光伏接入能力评估方法，其特征在于，所述的步骤5)中，要求两组数据不相同的具体内容为：判断两组数据的有功电流、无功电流的相对差值是否在10％以内，如果是则删除其中一组，读取新的一组，直至两组数据的有功电流、无功电流的相对差值≥10％。5. The method for evaluating the distributed photovoltaic access capability of a low-voltage station area according to claim 1, wherein in the step 5), the specific content that the two groups of data are required to be different is: judging the active power of the two groups of data. Check whether the relative difference between the current and reactive current is within 10%, if so, delete one group and read a new group until the relative difference between the active current and reactive current of the two groups of data is greater than or equal to 10%. 6.一种低压台区分布式光伏接入能力评估系统，其特征在于，包括：6. A low-voltage platform area distributed photovoltaic access capability evaluation system, characterized in that, comprising: 数据读取模块：选取具有光伏发电接入的低压台区，通过低压台区的采集器读取户用电能表的用户编号、有功电流、无功电流和电压数据，通过配变监测终端读取变压器低压侧有功电流、无功电流和电压数据，要求全部数据一次召唤，保证数据的同时性，忽略通信延迟；Data reading module: Select the low-voltage station area with photovoltaic power generation access, read the user number, active current, reactive current and voltage data of the household electric energy meter through the collector in the low-voltage station area, and read through the distribution transformer monitoring terminal. Take the active current, reactive current and voltage data of the low-voltage side of the transformer, and require all data to be called at one time to ensure the simultaneity of the data and ignore the communication delay; 数据存储模块：存储每次召唤的低压台区内所有单相或三相电能表的有功电流、无功电流、电压数据、用户编号及时标，精确到分钟；Data storage module: store the active current, reactive current, voltage data, user number and time stamp of all single-phase or three-phase electric energy meters in the low-voltage station area of each call, accurate to the minute; 节点接入最大电流选定模块：读取并存储低压台区内所有单相或三相电能表的电流互感器变比，将一次值作为节点i允许接入的最大电流Ii_max；Node access maximum current selection module: read and store the current transformer transformation ratios of all single-phase or three-phase electric energy meters in the low-voltage station area, and use the primary value as the maximum current I i_max that node i is allowed to access; 节点用户类型确定模块：由低压台区内所有单相或三相电能表的用户编号查询用户档案，确定该节点i用户的类型，包括无光伏发电、自发自用及全额上网；Node user type determination module: query the user file by the user numbers of all single-phase or three-phase electric energy meters in the low-voltage station area, and determine the type of user i of the node, including no photovoltaic power generation, self-generated self-use and full Internet access; 等效二端口网络参数计算模块：以低压台区变压器出线处作为首端，在存储数据中获取2个时刻的首段和节点i的有功电流、无功电流、电压数据、用户编号及时标，要求两组数据不相同，计算第i个节点与首端之间的等效二端口网络参数；Equivalent two-port network parameter calculation module: take the transformer outlet of the low-voltage station area as the head end, and obtain the active current, reactive current, voltage data, user number and time stamp of the first section and node i at two moments in the stored data, The two sets of data are required to be different, and the equivalent two-port network parameters between the i-th node and the head end are calculated; 电流最大接入能力确定模块：选取春分日正午时刻的首段的有功电流、无功电流和电压数据，将节点i的最大电流值Ii_max作为有功电流，无功电流设为零，通过获得的等效二端口网络参数计算节点i的电压是否满足220V的上下10％偏差以内，如满足则作为该节点的电流最大接入能力，不满足则以5％为步长降低有功电流，直至满足；The module for determining the maximum current access capability: select the active current, reactive current and voltage data of the first section at noon on the vernal equinox day, take the maximum current value I i_max of node i as the active current, and set the reactive current to zero. Calculate the equivalent two-port network parameters whether the voltage of node i meets the upper and lower 10% deviation of 220V. If it is satisfied, it is used as the maximum current access capability of the node. If it is not satisfied, the active current is reduced in steps of 5% until it is satisfied; 接入能力指标计算模块：按低压台区内用户编号所关联的用户类型，分类统计无光伏发电、全额上网及自发自用的最大接入电流之和，将其作为各类用户的接入能力指标。Access capability index calculation module: According to the user type associated with the user number in the low-voltage station area, classify and count the sum of the maximum access current of no photovoltaic power generation, full Internet access and spontaneous self-use, and use it as the access capability of various users index. 7.根据权利要求6所述的低压台区分布式光伏接入能力评估系统，其特征在于，所述的等效二端口网络参数计算模块中，等效二端口网络采用T型网络。7 . The low-voltage station area distributed photovoltaic access capability evaluation system according to claim 6 , wherein, in the equivalent two-port network parameter calculation module, the equivalent two-port network adopts a T-shaped network. 8 . 8.根据权利要求7所述的低压台区分布式光伏接入能力评估系统，其特征在于，所述等效二端口网络参数的求解公式如下：8. The low-voltage station area distributed photovoltaic access capability evaluation system according to claim 7, wherein the solution formula for the equivalent two-port network parameters is as follows:
Figure FDA0002312646450000041
Figure FDA0002312646450000041
 式中，
Figure FDA0002312646450000042
分别为第一个时刻二个端口的电压和电流值，
Figure FDA0002312646450000043
Figure FDA0002312646450000044
分别为第二个时刻二个端口的电压和电流值，符号的第一个下标编号为端口编号，符号的第二个下标编号为时刻编号；In the formula,
Figure FDA0002312646450000042
are the voltage and current values of the two ports at the first moment, respectively,
Figure FDA0002312646450000043
Figure FDA0002312646450000044
are the voltage and current values of the two ports at the second time, respectively, the first subscript number of the symbol is the port number, and the second subscript number of the symbol is the time number; Z1，Z2，Z3分别为T型网络的三个等效阻抗。Z 1 , Z 2 , and Z 3 are the three equivalent impedances of the T-type network, respectively. 9.根据权利要求8所述的低压台区分布式光伏接入能力评估系统，其特征在于，所述的电流最大接入能力确定模块中，节点i的电压由下式计算得到：9 . The low-voltage station area distributed photovoltaic access capability evaluation system according to claim 8 , wherein, in the current maximum access capability determination module, the voltage of node i is calculated by the following formula: 10 .
Figure FDA0002312646450000045
Figure FDA0002312646450000045
 式中，
Figure FDA0002312646450000046
为第一端口流入的电流，
Figure FDA0002312646450000047
为第二端口即输出端口流入的电流，
Figure FDA0002312646450000048
为第二端口的电压。In the formula,
Figure FDA0002312646450000046
is the current flowing into the first port,
Figure FDA0002312646450000047
is the current flowing into the second port, the output port,
Figure FDA0002312646450000048
is the voltage of the second port. 10.根据权利要求6所述的低压台区分布式光伏接入能力评估系统，其特征在于，所述的等效二端口网络参数计算模块中，要求两组数据不相同的具体内容为：判断两组数据的有功电流、无功电流的相对差值是否在10％以内，如果是则删除其中一组，读取新的一组，直至两组数据的有功电流、无功电流的相对差值≥10％。10 . The low-voltage station area distributed photovoltaic access capability evaluation system according to claim 6 , wherein, in the equivalent two-port network parameter calculation module, the specific content that the two sets of data are required to be different is: judging: 10 . Whether the relative difference between the active current and reactive current of the two groups of data is within 10%, if so, delete one group and read a new group until the relative difference between the active current and reactive current of the two groups of data ≥10%.
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