CN108683209B - A method and device for evaluating the grid-connected capability of a distributed power source - Google Patents

A method and device for evaluating the grid-connected capability of a distributed power source Download PDF

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CN108683209B
CN108683209B CN201810309590.4A CN201810309590A CN108683209B CN 108683209 B CN108683209 B CN 108683209B CN 201810309590 A CN201810309590 A CN 201810309590A CN 108683209 B CN108683209 B CN 108683209B
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陶琼
叶季蕾
王德顺
薛金花
杨波
张慧明
赵上林
姬联涛
俞斌
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China Electric Power Research Institute Co Ltd CEPRI
Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
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Yangquan Power Supply Co of State Grid Shanxi Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract

The invention provides a distributed power supply grid-connected capability evaluation method and a distributed power supply grid-connected capability evaluation device, wherein equipment parameters, a topological structure, operation data and initial power of an energy storage device of a power distribution network after grid connection of a distributed power supply are firstly obtained, then a plurality of operation scenes are determined according to the operation data, and load flow calculation is carried out on the power distribution network after grid connection of the distributed power supply according to the equipment parameters, the topological structure and the initial power of the energy storage device of the power distribution network, so that load flow calculation results under each operation scene are obtained; and finally, evaluating the grid-connected capability of the distributed power supply according to the load flow calculation result in each operation scene. According to the distributed power supply grid-connected capability evaluation method, the power of the energy storage device is considered, the distributed power supply grid-connected capability evaluation under the participation of the energy storage device is further realized, the accuracy of the evaluation result is improved, the real accepting capability of the power distribution network to the distributed power supply can be correctly reflected, and the development requirement of the energy storage device in the power distribution in the future is met.

Description

一种分布式电源并网能力评估方法和装置A method and device for evaluating the grid-connected capability of a distributed power source

技术领域technical field

本发明涉及新能源发电技术并网分析领域,具体涉及一种分布式电源并网能力评估方法和装置。The invention relates to the field of grid-connected analysis of new energy power generation technologies, in particular to a method and device for evaluating the grid-connected capability of a distributed power source.

背景技术Background technique

目前,随着低碳、绿色能源战略的推进,新一轮电力体制改革配套政策的落实,储能的应用价值得到了市场的认可,特别是用户侧储能持续保持高增长。根据统计,2000-2016年应用于用户侧的投运储能系统累计装机量为107.9MW(不包含抽水蓄能和储热项目)占全部装机的比例为57%。从2015年下半年至今,储能装机的新增规划量约为740MW,其中,安装在用户侧的比例占全部规划的54%。随着储能在配电网中的不断增加,对分布式电源消纳能力影响巨大,而现有技术中对分布式电源并网能力进行评估时,仅考虑分布式电源本身对配电网安全稳定运行的影响,采用电压、负荷波动等考核指标作为限制因素,计算结果存在偏差,且无法正确反应配电网对分布式电源的真实接纳能力。At present, with the advancement of low-carbon and green energy strategies and the implementation of a new round of power system reform supporting policies, the application value of energy storage has been recognized by the market, especially the user-side energy storage continues to maintain high growth. According to statistics, from 2000 to 2016, the cumulative installed capacity of the energy storage system applied to the user side was 107.9MW (excluding pumped storage and thermal storage projects), accounting for 57% of the total installed capacity. From the second half of 2015 to the present, the newly planned installed capacity of energy storage is about 740MW, of which the proportion installed on the user side accounts for 54% of the total planned. With the continuous increase of energy storage in the distribution network, it has a huge impact on the absorbing capacity of the distributed power generation. In the prior art, when evaluating the grid-connected capacity of the distributed power generation, only the safety of the distributed power generation itself is considered. For the influence of stable operation, the assessment indicators such as voltage and load fluctuation are used as limiting factors. The calculation results are biased and cannot correctly reflect the true acceptance capacity of the distribution network for distributed power generation.

发明内容SUMMARY OF THE INVENTION

为了克服上述现有技术中因未考虑储能装置的功率导致的评估结果存在偏差且无法正确反应配电网对分布式电源的真实接纳能力的不足,本发明提供一种分布式电源并网能力评估方法和装置,先获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率,然后根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;最后根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,考虑了储能装置的功率,提高了评估结果的准确性,且能够正确反应配电网对分布式电源的真实接纳能力。In order to overcome the above-mentioned deficiencies in the prior art that the evaluation results are biased because the power of the energy storage device is not considered and cannot correctly reflect the real acceptance capability of the distributed power supply by the distribution network, the present invention provides a grid-connected capability of the distributed power supply. The evaluation method and device first obtain the equipment parameters, topology structure, operation data and the initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid, and then determine a plurality of operation scenarios according to the operation data, and according to the equipment of the distribution network The parameters, topology structure and initial power of the energy storage device are used to calculate the power flow of the distribution network after the distributed power supply is connected to the grid, and the power flow calculation results in each operating scenario are obtained. The power of the energy storage device is considered, the accuracy of the evaluation results is improved, and it can correctly reflect the real capacity of the distribution network to accept the distributed power.

为了实现上述发明目的,本发明采取如下技术方案:In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

一方面,本发明提供一种分布式电源并网能力评估方法,包括:In one aspect, the present invention provides a method for evaluating the grid-connected capability of a distributed power source, including:

获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;Obtain the equipment parameters, topology, operation data and initial power of the energy storage device of the distribution network after the distributed generation is connected to the grid;

根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;所述潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;Determine multiple operating scenarios according to the operating data, and perform power flow calculation on the distribution network after the distributed power supply is connected to the grid according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device, and obtain the power flow calculation under each operating scenario. Result; the power flow calculation result includes the use capacity of the transformer, the use capacity of the line, the node voltage and the node voltage fluctuation;

根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估。According to the power flow calculation results in each operating scenario, the grid-connected capability of the distributed power generation is evaluated.

所述设备参数包括变压器参数和线路参数;The equipment parameters include transformer parameters and line parameters;

所述运行数据包括负荷运行数据和分布式电源运行数据;The operation data includes load operation data and distributed power supply operation data;

所述储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率。The initial power of the energy storage device includes the initial active power of the energy storage device and the initial reactive power of the energy storage device.

所述运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景。The operation scenarios include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario.

所述根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果,包括:The power flow calculation is performed on the power distribution network after the distributed power supply is connected to the grid according to the equipment parameters of the power distribution network, the topology structure and the initial power of the energy storage device, and the power flow calculation results in each operation scenario are obtained, including:

根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果。According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The network performs power flow calculation, and obtains the power flow calculation results in each operating scenario.

所述根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,包括:The evaluation of the grid-connected capability of the distributed power source according to the power flow calculation results in each operating scenario includes:

判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;Determine whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraints at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power supply;

判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;Determine whether the node voltage and the node voltage fluctuation amount do not exceed the standard. If yes, go to the next step. Otherwise, determine whether the energy storage device satisfies the corresponding constraint conditions. If the energy storage device meets the corresponding constraint conditions, determine the actual value of the energy storage device power and The actual value of the state of charge, otherwise the preset installed capacity of the distributed power supply is reduced;

判断变压器的使用容量、线路的使用流量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。Determine whether the capacity of the transformer, the use flow of the line, the node voltage or the fluctuation of the node voltage are equal to their respective limits. If so, output the final installed capacity of the distributed power supply, and evaluate the acceptance capacity of the distribution network after the distributed power supply is connected to the grid. , otherwise increase the preset installed capacity of distributed power.

所述变压器的使用容量对应的约束条件如下式:The constraints corresponding to the operating capacity of the transformer are as follows:

ST<ST额 S T < S T amount

其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer;

所述线路的使用容量对应的约束条件如下式:The constraints corresponding to the usage capacity of the lines are as follows:

SL<SL额 S L < S L amount

其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line.

所述判断节点电压及节点电压波动量是否都不超标,包括:The judging whether the node voltage and the node voltage fluctuation amount do not exceed the standard, including:

若满足

Figure BDA0001621989540000031
Figure BDA0001621989540000032
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure BDA0001621989540000033
Figure BDA0001621989540000034
分别表示节点k的电压下限值和上限值;dVk表示节点k的电压波动量,
Figure BDA0001621989540000035
表示节点k的电压波动限值。if satisfied
Figure BDA0001621989540000031
and
Figure BDA0001621989540000032
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure BDA0001621989540000033
and
Figure BDA0001621989540000034
respectively represent the lower limit and upper limit of the voltage of node k; dV k represents the voltage fluctuation of node k,
Figure BDA0001621989540000035
Represents the voltage fluctuation limit at node k.

所述储能装置对应的约束条件如下式:The constraints corresponding to the energy storage device are as follows:

Figure BDA0001621989540000036
Figure BDA0001621989540000036

SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax

其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.

所述确定储能装置的功率实际值和荷电状态实际值,包括:The determining of the actual value of power and the actual value of the state of charge of the energy storage device includes:

按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:Determine the actual value of the active power, the actual value of the reactive power and the actual value of the state of charge of the energy storage device as follows:

Figure BDA0001621989540000037
Figure BDA0001621989540000037

Figure BDA0001621989540000038
Figure BDA0001621989540000038

Figure BDA0001621989540000039
Figure BDA0001621989540000039

其中,PE表示储能装置的有功功率实际值,ωc表示储能装置中滤波器的截止频率,Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device, ω c represents the cut-off frequency of the filter in the energy storage device, P k represents the active power of node k , s represents the Laplace operator, and h represents the power adjustment coefficient , S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.

所述评估分布式电源并网后配电网的接纳能力,包括:The evaluation of the acceptance capacity of the distribution network after the grid-connected distributed generation includes:

按下式计算分布式电源的并网收益:Calculate the grid-connected benefits of distributed power sources as follows:

C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p

其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cg表示上网价格,cb表示电量补贴价格;Among them, C represents the grid-connected income of the distributed power generation, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, c g represents the on-grid price, and c b represents the electricity subsidy price;

判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。It is judged whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor.

所述评估分布式电源并网后配电网的接纳能力,包括:The evaluation of the acceptance capacity of the distribution network after the grid-connected distributed generation includes:

按下式计算分布式电源并网后配电网的平均供电可用率:The average power supply availability rate of the distribution network after the distributed power grid is connected to the grid is calculated as follows:

Figure BDA0001621989540000041
Figure BDA0001621989540000041

其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year;

判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。Determine whether ASAI≥ASAI set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor, where ASAI set represents the average power supply availability threshold.

另一方面,本发明提供一种分布式电源并网能力评估装置,包括:On the other hand, the present invention provides a distributed power grid-connected capability evaluation device, comprising:

获取模块,用于获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;The acquisition module is used to acquire the equipment parameters, topology structure, operation data and the initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid;

潮流计算模块,用于根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;所述潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;The power flow calculation module is used to determine multiple operation scenarios according to the operation data, and perform power flow calculation on the distribution network after the distributed power grid is connected according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device. The power flow calculation result in the operation scenario; the power flow calculation result includes the used capacity of the transformer, the used capacity of the line, the node voltage and the node voltage fluctuation;

评估模块,用于根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估。The evaluation module is used to evaluate the grid-connected capability of the distributed power generation according to the power flow calculation results in various operating scenarios.

所述获取模块获取的设备参数包括变压器参数和线路参数;The equipment parameters obtained by the obtaining module include transformer parameters and line parameters;

所述运行数据包括负荷运行数据和分布式电源运行数据;The operation data includes load operation data and distributed power supply operation data;

所述储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率。The initial power of the energy storage device includes the initial active power of the energy storage device and the initial reactive power of the energy storage device.

所述潮流计算模块包括确定单元,所述确定单元确定的运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景。The power flow calculation module includes a determination unit, and the operation scenarios determined by the determination unit include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario.

所述潮流计算模块包括潮流计算单元,所述潮流计算单元具体用于:The power flow calculation module includes a power flow calculation unit, and the power flow calculation unit is specifically used for:

根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果。According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The network performs power flow calculation, and obtains the power flow calculation results in each operating scenario.

所述评估模块包括:The evaluation module includes:

第一判断单元,用于判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;The first judgment unit is used for judging whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraint conditions at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power source;

第二判断单元,用于判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;The second judging unit is used to judge whether the node voltage and the node voltage fluctuation amount are not exceeding the standard, if so, go to the next step, otherwise judge whether the energy storage device satisfies the corresponding constraint conditions, if the energy storage device satisfies the corresponding constraint conditions, determine the storage device The actual value of the power and the actual value of the state of charge of the energy device, otherwise the preset installed capacity of the distributed power supply is reduced;

第三判断单元,用于判断变压器的使用容量、线路的使用流量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。The third judging unit is used to judge whether the use capacity of the transformer, the use flow of the line, the node voltage or the node voltage fluctuation amount are equal to their respective limits, if so, output the final installed capacity of the distributed power supply, and evaluate the grid connection of the distributed power supply The receiving capacity of the distribution network, otherwise, the preset installed capacity of the distributed power supply will be increased.

所述变压器的使用容量对应的约束条件如下式:The constraints corresponding to the operating capacity of the transformer are as follows:

ST<ST额 S T < S T amount

其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer;

所述线路的使用容量对应的约束条件如下式:The constraints corresponding to the usage capacity of the lines are as follows:

SL<SL额 S L < S L amount

其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line.

所述第二判断单元具体用于:The second judgment unit is specifically used for:

若满足

Figure BDA0001621989540000051
Figure BDA0001621989540000052
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure BDA0001621989540000053
Figure BDA0001621989540000054
分别表示节点k的电压下限值和上限值;dVk表示节点k的电压波动量,
Figure BDA0001621989540000055
表示节点k的电压波动限值。if satisfied
Figure BDA0001621989540000051
and
Figure BDA0001621989540000052
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure BDA0001621989540000053
and
Figure BDA0001621989540000054
respectively represent the lower limit and upper limit of the voltage of node k; dV k represents the voltage fluctuation of node k,
Figure BDA0001621989540000055
Indicates the voltage fluctuation limit at node k.

所述储能装置对应的约束条件如下式:The constraints corresponding to the energy storage device are as follows:

Figure BDA0001621989540000056
Figure BDA0001621989540000056

SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax

其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.

所述第二判断模块具体用于:The second judgment module is specifically used for:

按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:Determine the actual value of the active power, the actual value of the reactive power and the actual value of the state of charge of the energy storage device as follows:

Figure BDA0001621989540000057
Figure BDA0001621989540000057

Figure BDA0001621989540000061
Figure BDA0001621989540000061

Figure BDA0001621989540000062
Figure BDA0001621989540000062

其中,PE表示储能装置的有功功率实际值,ωc表示储能装置中滤波器的截止频率,Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device, ω c represents the cut-off frequency of the filter in the energy storage device, P k represents the active power of node k , s represents the Laplace operator, and h represents the power adjustment coefficient , S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.

所述第三判断单元具体用于:The third judgment unit is specifically used for:

按下式计算分布式电源的并网收益:Calculate the grid-connected benefits of distributed power sources as follows:

C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p

其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cg表示上网价格,cb表示电量补贴价格;Among them, C represents the grid-connected income of the distributed power generation, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, c g represents the on-grid price, and c b represents the electricity subsidy price;

判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。It is judged whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor.

所述第三判断单元具体用于:The third judgment unit is specifically used for:

按下式计算分布式电源并网后配电网的平均供电可用率:The average power supply availability rate of the distribution network after the distributed power grid is connected to the grid is calculated as follows:

Figure BDA0001621989540000063
Figure BDA0001621989540000063

其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year;

判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。Determine whether ASAI≥ASAI set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor, where ASAI set represents the average power supply availability threshold.

与最接近的现有技术相比,本发明提供的技术方案具有以下有益效果:Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

本发明提供的分布式电源并网能力评估方法中,先获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率,然后根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;最后根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,考虑了储能装置的功率,提高了评估结果的准确性,且能够正确反应配电网对分布式电源的真实接纳能力;In the method for evaluating the grid-connection capability of the distributed power supply provided by the present invention, the equipment parameters, topology structure, operation data and initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid are first obtained, and then a plurality of operation data are determined according to the operation data. According to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device, the power flow calculation is carried out on the distribution network after the distributed power grid is connected to the grid, and the power flow calculation results under each operating scenario are obtained. Finally, according to each operating scenario The power flow calculation results below evaluate the grid-connected capability of the distributed power generation, taking into account the power of the energy storage device, which improves the accuracy of the evaluation results, and can correctly reflect the distribution network's real capacity to accept the distributed power generation;

本发明提供的分布式电源并网能力评估装置包括获取模块、潮流计算模块和评估模块,获取模块用于获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率,潮流计算模块用于根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;评估模块用于根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,考虑了储能装置的功率,提高了评估结果的准确性,且能够正确反应配电网对分布式电源的真实接纳能力;The device for evaluating the grid-connected capability of the distributed power supply provided by the present invention includes an acquisition module, a power flow calculation module and an evaluation module. The acquisition module is used to acquire the equipment parameters, topology structure, operation data and energy storage device of the distribution network after the distributed power supply is connected to the grid. The power flow calculation module is used to determine multiple operating scenarios according to the operating data, and perform power flow calculation on the distribution network after the distributed power generation is connected to the grid according to the equipment parameters, topology structure and initial power of the energy storage device of the distribution network. , to obtain the power flow calculation results in each operating scenario; the power flow calculation results include the use capacity of the transformer, the use capacity of the line, the node voltage and the node voltage fluctuation; the evaluation module is used for the distributed power generation according to the power flow calculation results in each operating scenario. The power of the energy storage device is considered, the accuracy of the evaluation results is improved, and it can correctly reflect the real capacity of the distribution network to accept the distributed power;

本发明提供的技术方案考虑了储能装置的功率,进而实现储能装置参与下的分布式电源并网能力评估,适应了未来储能装置在配电中的发展需求;The technical solution provided by the present invention takes the power of the energy storage device into consideration, thereby realizing the grid-connected capability evaluation of the distributed power source with the participation of the energy storage device, and adapting to the development needs of the energy storage device in power distribution in the future;

本发明提供的技术方案考虑了变压器的使用容量、线路的使用容量、节点电压、节点电压波动量以及储能装置的功率和荷电状态各自的约束条件,并从经济性和可靠性两方面对分布式电源的并网能力进行评估,评估更全面。The technical solution provided by the present invention considers the use capacity of the transformer, the use capacity of the line, the node voltage, the node voltage fluctuation, and the respective constraints of the power and state of charge of the energy storage device, and from the aspects of economy and reliability. The grid-connected capability of distributed power generation is evaluated, and the evaluation is more comprehensive.

附图说明Description of drawings

图1是本发明实施例中分布式电源并网能力评估方法流程图;1 is a flowchart of a method for evaluating the grid-connected capability of a distributed power source in an embodiment of the present invention;

图2是本发明实施例中含分布式光伏及储能装置的配电网模型示意图;2 is a schematic diagram of a distribution network model including distributed photovoltaics and energy storage devices in an embodiment of the present invention;

图3是本发明实施例中负荷的运行数据形成的负荷运行场景示意图;3 is a schematic diagram of a load operation scenario formed by load operation data in an embodiment of the present invention;

图4是本发明实施例中光伏的运行数据形成的光伏运行场景示意图。4 is a schematic diagram of a photovoltaic operation scene formed by photovoltaic operation data in an embodiment of the present invention.

具体实施方式Detailed ways

下面结合附图对本发明作进一步详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.

本发明实施例提供了一种分布式电源并网能力评估方法,具体流程图如图1所示,具体过程如下:An embodiment of the present invention provides a method for evaluating the grid-connected capability of a distributed power source. The specific flowchart is shown in FIG. 1 , and the specific process is as follows:

S101:获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;S101: Obtain the equipment parameters, topology structure, operation data and initial power of the energy storage device of the distribution network after the distributed power source is connected to the grid;

S102:根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果,潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;S102: Determine multiple operation scenarios according to the operation data, and perform power flow calculation on the distribution network after the grid-connected distributed power supply according to the equipment parameters, topology structure and initial power of the energy storage device of the distribution network, and obtain the power flow under each operation scenario. Power flow calculation results, including the use capacity of the transformer, the use capacity of the line, the node voltage and the node voltage fluctuation;

S103:根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估。S103: Evaluate the grid-connection capability of the distributed power source according to the power flow calculation results in each operation scenario.

上述S101中,含分布式光伏及储能装置的配电网模型如图2所示,图2中,节点1至节点17均连接负荷,其中节点9、节点10、节点13至节点17均有光伏,节点11和节点12均有光伏和储能装置,两个储能装置的容量均为180kW/220kWh。从图2中获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率,其中设备参数包括变压器参数和线路参数,运行数据包括负荷运行数据和分布式电源运行数据,储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率。In the above S101, the distribution network model including distributed photovoltaic and energy storage devices is shown in Figure 2. In Figure 2, nodes 1 to 17 are all connected to loads, and node 9, node 10, and node 13 to node 17 are all connected to the load. Photovoltaic, node 11 and node 12 have photovoltaic and energy storage devices, and the capacity of both energy storage devices is 180kW/220kWh. Obtain the equipment parameters, topology, operation data and initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid from Figure 2. The equipment parameters include transformer parameters and line parameters, and the operation data includes load operation data and distributed power. Power supply operation data, the initial power of the energy storage device includes the initial active power of the energy storage device and the initial reactive power of the energy storage device.

上述S102中,根据运行数据确定的运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景。In the above S102, the operation scenarios determined according to the operation data include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario.

负荷的运行数据形成的负荷运行场景示意图如图3所示,可以取两条边界曲线作为负荷运行场景,其中虚线表示大负荷运行场景,实线表示小负荷运行场景。对大量光伏发电数据进行整理,发现光伏发电出力具有随机性,部分曲线存在很大波动性,进行接纳能力分析时分布式光伏可以考虑取波动性出力曲线及最大晴天出力曲线作为光伏运行场景,光伏的运行数据形成的光伏运行场景如图4所示,其中虚线表示大发电运行场景,实线表示波动发电运行场景(额定容量100kW)。The schematic diagram of the load operation scenario formed by the load operation data is shown in Figure 3. Two boundary curves can be taken as the load operation scenario, in which the dotted line represents the high-load operation scenario, and the solid line represents the small-load operation scenario. After sorting out a large amount of photovoltaic power generation data, it is found that the output of photovoltaic power generation is random, and some curves have great volatility. When analyzing the capacity of distributed photovoltaics, the fluctuation output curve and the maximum sunny day output curve can be considered as photovoltaic operation scenarios. The photovoltaic operation scenario formed by the operating data of , is shown in Figure 4, in which the dotted line represents the large power generation operation scenario, and the solid line represents the fluctuation power generation operation scenario (rated capacity 100kW).

上述S102中,根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果,具体过程如下:In the above S102, the power flow calculation is performed on the power distribution network after the distributed power supply is connected to the grid according to the equipment parameters of the power distribution network, the topology structure and the initial power of the energy storage device, and the power flow calculation results in each operation scenario are obtained. The specific process is as follows:

根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果。According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The network performs power flow calculation, and obtains the power flow calculation results in each operating scenario.

上述S103中,根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,具体过程如下:In the above S103, the grid-connected capability of the distributed power generation is evaluated according to the power flow calculation results in each operating scenario, and the specific process is as follows:

1)判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;1) Determine whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraints at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power supply;

2)判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;2) Judging whether the node voltage and the node voltage fluctuation amount are not exceeding the standard, if so, go to the next step, otherwise judge whether the energy storage device satisfies the corresponding constraint conditions, if the energy storage device satisfies the corresponding constraint conditions, determine the actual power of the energy storage device value and the actual value of the state of charge, otherwise the preset installed capacity of the distributed power supply is reduced;

3)判断变压器的使用容量、线路的使用流量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。3) Determine whether the use capacity of the transformer, the use flow of the line, the node voltage or the node voltage fluctuation are equal to their respective limits. If so, output the final installed capacity of the distributed power supply, and evaluate the distribution network after the distributed power supply is connected to the grid. Acceptance capacity, otherwise increase the preset installed capacity of distributed power generation.

上述1)中,变压器的使用容量对应的约束条件如下式:In the above 1), the constraints corresponding to the operating capacity of the transformer are as follows:

ST<ST额 S T < S T amount

其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer;

线路的使用容量对应的约束条件如下式:The constraints corresponding to the use capacity of the line are as follows:

SL<SL额 S L < S L amount

其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line.

上述2)中,判断节点电压及节点电压波动量是否都不超标,具体过程如下:In the above 2), it is determined whether the node voltage and the node voltage fluctuation amount are not exceeding the standard. The specific process is as follows:

若满足

Figure BDA0001621989540000091
Figure BDA0001621989540000092
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure BDA0001621989540000093
Figure BDA0001621989540000094
分别表示节点k的电压下限值和上限值,dVk表示节点k的电压波动量,
Figure BDA0001621989540000095
表示节点k的电压波动限值。
Figure BDA0001621989540000096
(参照国标对电压波动的要求,波动频度1<r≤10次/h,电压变动限值3%,考虑一定安全裕度取为2.95%)。if satisfied
Figure BDA0001621989540000091
and
Figure BDA0001621989540000092
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure BDA0001621989540000093
and
Figure BDA0001621989540000094
respectively represent the lower limit and upper limit of the voltage of node k, dV k represents the voltage fluctuation of node k,
Figure BDA0001621989540000095
Represents the voltage fluctuation limit at node k.
Figure BDA0001621989540000096
(Refer to the requirements of the national standard for voltage fluctuation, the fluctuation frequency is 1<r≤10 times/h, the voltage fluctuation limit is 3%, and a certain safety margin is taken as 2.95%).

在本发明实例中,不考虑储能配置的情况下,该地区10kV配电网最大可接纳分布式光伏发电系统容量为3.2MW;考虑储能配置的情况下,该地区10kV配电网最大可接纳分布式光伏发电系统容量为4.44MW。In the example of the present invention, without considering the energy storage configuration, the maximum capacity of the distributed photovoltaic power generation system that can be accommodated by the 10kV distribution network in this area is 3.2MW; considering the energy storage configuration, the maximum capacity of the 10kV distribution network in this area is 3.2MW. The capacity of the distributed photovoltaic power generation system is 4.44MW.

上述2)中,储能装置对应的约束条件如下式:In the above 2), the corresponding constraints of the energy storage device are as follows:

Figure BDA0001621989540000097
Figure BDA0001621989540000097

SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax

其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.

上述2)中,按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:In the above 2), the actual value of the active power, the actual value of the reactive power and the actual value of the state of charge of the energy storage device are determined as follows:

Figure BDA0001621989540000098
Figure BDA0001621989540000098

Figure BDA0001621989540000099
Figure BDA0001621989540000099

Figure BDA0001621989540000101
Figure BDA0001621989540000101

其中,PE表示储能装置的有功功率实际值;ωc表示储能装置中滤波器的截止频率,ωc取3.33×10-3Hz;Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,k取0.0028;SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device; ω c represents the cut-off frequency of the filter in the energy storage device, and ω c is 3.33×10 -3 Hz; P k represents the active power of node k , and s represents Lapp Lass operator, h represents the power adjustment coefficient, k is 0.0028; S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.

上述S103中,可以从经济性或可靠性评估分布式电源并网后配电网的接纳能力:In the above S103, the acceptance capacity of the distribution network after the distributed power generation is connected to the grid can be evaluated from the perspective of economy or reliability:

1)从经济性评估分布式电源并网后配电网的接纳能力的具体过程如下:1) The specific process of evaluating the acceptance capacity of the distribution network after the distributed generation is connected to the grid from the perspective of economy is as follows:

1-1)按下式计算分布式电源的并网收益:1-1) Calculate the grid-connected benefit of distributed power generation as follows:

C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p

其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cp取0.895元/kWh;cg表示上网价格,cb表示补贴价格,cb取0.42元/kWh;Among them, C represents the grid-connected income of the distributed power supply, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, and cp is 0.895 yuan/kWh; c g represents the on-grid price, c b represents the subsidy price, and c b is 0.42 yuan/kWh;

1-2)判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。1-2) Determine whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is poor, and C set represents the grid-connected revenue threshold .

如上所述,不考虑储能配置的情况下分布式发电并网收益267.6万元/年,考虑储能配置的情况下分布式发电并网收益374.8万元/年,由此可见,考虑储能配置情况下的分布式发电并网收益更好。As mentioned above, the grid-connected revenue of distributed generation is 2.676 million yuan/year without considering the energy storage configuration, and the grid-connected revenue of distributed generation is 3.748 million yuan/year when energy storage configuration is considered. It can be seen that considering energy storage In the case of configuration, the benefits of grid-connected distributed generation are better.

2)从可靠性评估分布式电源并网后配电网的接纳能力的具体过程如下:2) The specific process of evaluating the acceptance capacity of the distribution network after the distributed generation is connected to the grid from the perspective of reliability is as follows:

2-1)按下式计算分布式电源并网后配电网的平均供电可用率:2-1) Calculate the average power supply availability rate of the distribution network after the distributed generation is connected to the grid as follows:

Figure BDA0001621989540000102
Figure BDA0001621989540000102

其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year;

2-2)判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。2-2) Determine whether ASAI≥ASAI set is satisfied, if yes, the acceptance capacity of the distribution network after the distributed power grid is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed power grid is connected to the grid is poor, where ASAI set means that the average power supply is available rate threshold.

基于同一发明构思,本发明实施例还提供一种分布式电源并网能力评估装置,包括获取模块、潮流计算模块和评估模块,下面分别对上述几个模块进行详细说明:Based on the same inventive concept, an embodiment of the present invention also provides a distributed power grid-connected capability evaluation device, including an acquisition module, a power flow calculation module, and an evaluation module. The above modules are described in detail below:

其中的获取模块,用于获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;The acquisition module is used to acquire the equipment parameters, topology structure, operation data and the initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid;

其中的潮流计算模块,用于根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;The power flow calculation module is used to determine multiple operation scenarios according to the operation data, and perform power flow calculation for the distribution network after the distributed power grid is connected to the grid according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device. Obtain the power flow calculation results under each operating scenario; the power flow calculation results include the use capacity of the transformer, the use capacity of the line, the node voltage and the node voltage fluctuation;

其中的评估模块,用于根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估。The evaluation module is used to evaluate the grid-connected capability of the distributed power generation according to the power flow calculation results in various operating scenarios.

上述获取模块获取的设备参数包括变压器参数和线路参数,获取的运行数据包括负荷运行数据和分布式电源运行数据,获取的储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率。The equipment parameters obtained by the above acquisition module include transformer parameters and line parameters, the obtained operation data includes load operation data and distributed power supply operation data, and the obtained initial power of the energy storage device includes the initial active power of the energy storage device and the energy storage device. Initial reactive power.

上述的潮流计算模块包括确定单元,确定单元确定的运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景。The above-mentioned power flow calculation module includes a determination unit, and the operation scenarios determined by the determination unit include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario.

上述潮流计算模块还包括潮流计算单元,潮流计算单元根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算的具体过程如下:The above power flow calculation module also includes a power flow calculation unit. The power flow calculation unit performs power flow calculation on the distribution network after the distributed power generation is connected to the grid according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device. The specific process is as follows:

根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果。According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The network performs power flow calculation, and obtains the power flow calculation results in each operating scenario.

上述的评估模块包括:The aforementioned evaluation modules include:

第一判断单元,用于判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;The first judgment unit is used for judging whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraint conditions at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power source;

第二判断单元,用于判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;The second judging unit is used to judge whether the node voltage and the node voltage fluctuation amount are not exceeding the standard, if so, go to the next step, otherwise judge whether the energy storage device satisfies the corresponding constraint conditions, if the energy storage device satisfies the corresponding constraint conditions, determine the storage device The actual value of the power and the actual value of the state of charge of the energy device, otherwise the preset installed capacity of the distributed power supply is reduced;

第三判断单元,用于判断变压器的使用容量、线路的使用流量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。The third judging unit is used to judge whether the use capacity of the transformer, the use flow of the line, the node voltage or the node voltage fluctuation amount are equal to their respective limits, if so, output the final installed capacity of the distributed power supply, and evaluate the grid connection of the distributed power supply The receiving capacity of the distribution network, otherwise, the preset installed capacity of the distributed power supply will be increased.

上述变压器的使用容量对应的约束条件如下式:The constraints corresponding to the operating capacity of the above transformers are as follows:

ST<ST额 S T < S T amount

其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer;

上述线路的使用容量对应的约束条件如下式:The constraints corresponding to the usage capacity of the above lines are as follows:

SL<SL额 S L < S L amount

其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line.

上述第二判断单元判断节点电压及节点电压波动量是否都不超标的具体过程如下:The specific process of the second judgment unit judging whether the node voltage and the node voltage fluctuation amount do not exceed the standard is as follows:

若满足

Figure BDA0001621989540000121
Figure BDA0001621989540000122
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure BDA0001621989540000123
Figure BDA0001621989540000124
分别表示节点k的电压下限值和上限值;dVk表示节点k的电压波动量,
Figure BDA0001621989540000125
表示节点k的电压波动限值。if satisfied
Figure BDA0001621989540000121
and
Figure BDA0001621989540000122
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure BDA0001621989540000123
and
Figure BDA0001621989540000124
respectively represent the lower limit and upper limit of the voltage of node k; dV k represents the voltage fluctuation of node k,
Figure BDA0001621989540000125
Represents the voltage fluctuation limit at node k.

上述储能装置对应的约束条件如下式:The constraints corresponding to the above energy storage devices are as follows:

Figure BDA0001621989540000126
Figure BDA0001621989540000126

SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax

其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.

上述第二判断模块按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:The above-mentioned second judgment module determines the actual value of active power, actual value of reactive power and actual value of state of charge of the energy storage device as follows:

Figure BDA0001621989540000127
Figure BDA0001621989540000127

Figure BDA0001621989540000128
Figure BDA0001621989540000128

Figure BDA0001621989540000129
Figure BDA0001621989540000129

其中,PE表示储能装置的有功功率实际值,ωc表示储能装置中滤波器的截止频率,Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device, ω c represents the cut-off frequency of the filter in the energy storage device, P k represents the active power of node k , s represents the Laplace operator, and h represents the power adjustment coefficient , S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.

上述第三判断单元可以从经济性或可靠性评估分布式电源并网后配电网的接纳能力:The above-mentioned third judgment unit can evaluate the acceptance capacity of the distribution network after the distributed power generation is connected to the grid from the perspective of economy or reliability:

1)第三判断单元从经济性评估分布式电源并网后配电网的接纳能力的具体过程如下:1) The specific process for the third judgment unit to evaluate the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is as follows:

1-1)按下式计算分布式电源的并网收益:1-1) Calculate the grid-connected benefit of distributed power generation as follows:

C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p

其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cg表示上网价格,cb表示电量补贴价格;Among them, C represents the grid-connected income of the distributed power generation, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, c g represents the on-grid price, and c b represents the electricity subsidy price;

1-2)判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。1-2) Determine whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is poor, and C set represents the grid-connected revenue threshold .

2)第三判断单元从可靠性评估分布式电源并网后配电网的接纳能力的具体过程如下:2) The specific process for the third judgment unit to evaluate the acceptance capacity of the distribution network after the distributed power generation is connected to the grid is as follows:

2-1)按下式计算分布式电源并网后配电网的平均供电可用率:2-1) Calculate the average power supply availability rate of the distribution network after the distributed generation is connected to the grid as follows:

Figure BDA0001621989540000131
Figure BDA0001621989540000131

其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year;

2-2)判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。2-2) Determine whether ASAI≥ASAI set is satisfied, if yes, the acceptance capacity of the distribution network after the distributed power grid is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed power grid is connected to the grid is poor, where ASAI set means that the average power supply is available rate threshold.

为了描述的方便,以上所述装置的各部分以功能分为各种模块或单元分别描述。当然,在实施本申请时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。For the convenience of description, each part of the device described above is divided into various modules or units by function and described respectively. Of course, when implementing the present application, the functions of each module or unit may be implemented in one or more software or hardware.

本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

最后应当说明的是:以上实施例仅用以说明本发明的技术方案而非对其限制,所属领域的普通技术人员参照上述实施例依然可以对本发明的具体实施方式进行修改或者等同替换,这些未脱离本发明精神和范围的任何修改或者等同替换,均在申请待批的本发明的权利要求保护范围之内。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those of ordinary skill in the art can still modify or equivalently replace the specific embodiments of the present invention with reference to the above embodiments. Any modifications or equivalent substitutions that depart from the spirit and scope of the present invention are all within the protection scope of the claims of the present invention for which the application is pending.

Claims (14)

1.一种分布式电源并网能力评估方法,其特征在于,包括:1. A method for evaluating the grid-connected capability of distributed power sources, comprising: 获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;Obtain the equipment parameters, topology, operation data and initial power of the energy storage device of the distribution network after the distributed generation is connected to the grid; 根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;所述潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;Determine multiple operating scenarios according to the operating data, and perform power flow calculation on the distribution network after the distributed power supply is connected to the grid according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device, and obtain the power flow calculation under each operating scenario. Result; the power flow calculation result includes the use capacity of the transformer, the use capacity of the line, the node voltage and the node voltage fluctuation; 根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估;Evaluate the grid-connected capability of distributed power sources according to the power flow calculation results in each operating scenario; 所述设备参数包括变压器参数和线路参数;The equipment parameters include transformer parameters and line parameters; 所述运行数据包括负荷运行数据和分布式电源运行数据;The operation data includes load operation data and distributed power supply operation data; 所述储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率;The initial power of the energy storage device includes the initial active power of the energy storage device and the initial reactive power of the energy storage device; 所述运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景;The operation scenarios include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario; 所述根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果,包括:The power flow calculation is performed on the power distribution network after the distributed power supply is connected to the grid according to the equipment parameters of the power distribution network, the topology structure and the initial power of the energy storage device, and the power flow calculation results in each operation scenario are obtained, including: 根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The power flow calculation is carried out through the network, and the power flow calculation results under each operating scenario are obtained; 所述根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估,包括:The evaluation of the grid-connected capability of the distributed power source according to the power flow calculation results in each operating scenario includes: 判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;Determine whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraints at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power supply; 判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;Determine whether the node voltage and the node voltage fluctuation amount do not exceed the standard. If yes, go to the next step. Otherwise, determine whether the energy storage device satisfies the corresponding constraint conditions. If the energy storage device meets the corresponding constraint conditions, determine the actual value of the energy storage device power and The actual value of the state of charge, otherwise the preset installed capacity of the distributed power supply is reduced; 判断变压器的使用容量、线路的使用容量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。Determine whether the capacity of the transformer, the capacity of the line, the node voltage or the node voltage fluctuation are equal to their respective limits. If so, output the final installed capacity of the distributed power supply, and evaluate the acceptance capacity of the distribution network after the distributed power supply is connected to the grid. , otherwise increase the preset installed capacity of distributed power. 2.根据权利要求1所述的分布式电源并网能力评估方法,其特征在于,所述变压器的使用容量对应的约束条件如下式:2. The method for evaluating the grid-connected capability of a distributed power source according to claim 1, wherein the corresponding constraint condition of the used capacity of the transformer is as follows: ST<ST额 S T < S T amount 其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer; 所述线路的使用容量对应的约束条件如下式:The constraints corresponding to the usage capacity of the lines are as follows: SL<SL额 S L < S L amount 其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line. 3.根据权利要求1所述的分布式电源并网能力评估方法,其特征在于,所述判断节点电压及节点电压波动量是否都不超标,包括:3. The method for evaluating the grid-connected capability of a distributed power source according to claim 1, wherein the judging whether the node voltage and the node voltage fluctuation amount do not exceed the standard, comprising: 若满足
Figure FDA0003711908890000021
Figure FDA0003711908890000022
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure FDA0003711908890000023
Figure FDA0003711908890000024
分别表示节点k的电压下限值和上限值;dVk表示节点k的电压波动量,
Figure FDA0003711908890000025
表示节点k的电压波动限值。
if satisfied
Figure FDA0003711908890000021
and
Figure FDA0003711908890000022
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure FDA0003711908890000023
and
Figure FDA0003711908890000024
respectively represent the lower limit and upper limit of the voltage of node k; dV k represents the voltage fluctuation of node k,
Figure FDA0003711908890000025
Represents the voltage fluctuation limit at node k.
4.根据权利要求3所述的分布式电源并网能力评估方法,其特征在于,所述储能装置对应的约束条件如下式:4. The method for evaluating the grid-connected capability of distributed power sources according to claim 3, wherein the corresponding constraints of the energy storage device are as follows:
Figure FDA0003711908890000026
Figure FDA0003711908890000026
SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax 其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.
5.根据权利要求4所述的分布式电源并网能力评估方法,其特征在于,所述确定储能装置的功率实际值和荷电状态实际值,包括:5. The method for evaluating the grid-connected capability of distributed power sources according to claim 4, wherein the determining the actual value of power and the actual value of the state of charge of the energy storage device comprises: 按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:Determine the actual value of the active power, the actual value of the reactive power and the actual value of the state of charge of the energy storage device as follows:
Figure FDA0003711908890000027
Figure FDA0003711908890000027
Figure FDA0003711908890000028
Figure FDA0003711908890000028
Figure FDA0003711908890000031
Figure FDA0003711908890000031
其中,PE表示储能装置的有功功率实际值,ωc表示储能装置中滤波器的截止频率,Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device, ω c represents the cut-off frequency of the filter in the energy storage device, P k represents the active power of node k , s represents the Laplace operator, and h represents the power adjustment coefficient , S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.
6.根据权利要求1所述的分布式电源并网能力评估方法,其特征在于,所述评估分布式电源并网后配电网的接纳能力,包括:6. The method for evaluating the grid-connected capability of a distributed power source according to claim 1, wherein the evaluation of the receiving capacity of the distribution network after the distributed power source is connected to the grid comprises: 按下式计算分布式电源的并网收益:Calculate the grid-connected benefits of distributed power sources as follows: C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p 其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cg表示上网价格,cb表示电量补贴价格;Among them, C represents the grid-connected income of the distributed power generation, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, c g represents the on-grid price, and c b represents the electricity subsidy price; 判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。It is judged whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor. 7.根据权利要求1所述的分布式电源并网能力评估方法,其特征在于,所述评估分布式电源并网后配电网的接纳能力,包括:7. The method for evaluating the grid-connected capability of a distributed power source according to claim 1, wherein the evaluation of the receiving capacity of the distribution network after the distributed power source is connected to the grid comprises: 按下式计算分布式电源并网后配电网的平均供电可用率:The average power supply availability rate of the distribution network after the distributed power grid is connected to the grid is calculated as follows:
Figure FDA0003711908890000032
Figure FDA0003711908890000032
其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year; 判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。Determine whether ASAI≥ASAI set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor, where ASAI set represents the average power supply availability threshold.
8.一种分布式电源并网能力评估装置,其特征在于,包括:8. A device for evaluating the grid-connected capability of distributed power sources, comprising: 获取模块,用于获取分布式电源并网后配电网的设备参数、拓扑结构、运行数据以及储能装置的初始功率;The acquisition module is used to acquire the equipment parameters, topology structure, operation data and the initial power of the energy storage device of the distribution network after the distributed power supply is connected to the grid; 潮流计算模块,用于根据运行数据确定多个运行场景,并根据配电网的设备参数、拓扑结构和储能装置的初始功率对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;所述潮流计算结果包括变压器的使用容量、线路的使用容量、节点电压和节点电压波动量;The power flow calculation module is used to determine multiple operation scenarios according to the operation data, and perform power flow calculation on the distribution network after the distributed power grid is connected according to the equipment parameters of the distribution network, the topology structure and the initial power of the energy storage device. The power flow calculation result in the operation scenario; the power flow calculation result includes the used capacity of the transformer, the used capacity of the line, the node voltage and the node voltage fluctuation; 评估模块,用于根据各个运行场景下的潮流计算结果对分布式电源的并网能力进行评估;The evaluation module is used to evaluate the grid-connected capability of the distributed power generation according to the power flow calculation results in various operating scenarios; 所述获取模块获取的设备参数包括变压器参数和线路参数;The equipment parameters obtained by the obtaining module include transformer parameters and line parameters; 所述运行数据包括负荷运行数据和分布式电源运行数据;The operation data includes load operation data and distributed power supply operation data; 所述储能装置的初始功率包括储能装置的初始有功功率和储能装置的初始无功功率;The initial power of the energy storage device includes the initial active power of the energy storage device and the initial reactive power of the energy storage device; 所述潮流计算模块包括确定单元,所述确定单元确定的运行场景包括大负荷小发电场景、大负荷波动发电场景、小负荷大发电场景以及小负荷波动发电场景;所述潮流计算模块包括潮流计算单元,所述潮流计算单元具体用于:The power flow calculation module includes a determination unit, and the operation scenarios determined by the determination unit include a large load and small power generation scenario, a large load fluctuation power generation scenario, a small load large power generation scenario, and a small load fluctuation power generation scenario; the power flow calculation module includes a power flow calculation module. unit, the power flow calculation unit is specifically used for: 根据配电网的设备参数、拓扑结构、储能装置的初始功率以及负荷曲线与分布式电源的出力曲线之间的时序匹配性,并采用电力系统仿真软件对分布式电源并网后的配电网进行潮流计算,得到各个运行场景下的潮流计算结果;According to the equipment parameters, topology structure of the distribution network, the initial power of the energy storage device, and the time sequence matching between the load curve and the output curve of the distributed power supply, the power system simulation software is used to analyze the power distribution after the distributed power supply is connected to the grid. The power flow calculation is carried out through the network, and the power flow calculation results under each operating scenario are obtained; 所述评估模块包括:The evaluation module includes: 第一判断单元,用于判断变压器的使用容量和线路的使用容量是否同时满足对应的约束条件,若是,进入下一步,否则减小分布式电源的预设装机容量;The first judgment unit is used for judging whether the use capacity of the transformer and the use capacity of the line meet the corresponding constraint conditions at the same time, if so, go to the next step, otherwise reduce the preset installed capacity of the distributed power source; 第二判断单元,用于判断节点电压及节点电压波动量是否都不超标,若是,进入下一步,否则判断储能装置是否满足对应的约束条件,若储能装置满足相应的约束条件,确定储能装置的功率实际值和荷电状态实际值,否则减小分布式电源的预设装机容量;The second judging unit is used to judge whether the node voltage and the node voltage fluctuation amount are not exceeding the standard, if so, go to the next step, otherwise judge whether the energy storage device satisfies the corresponding constraint conditions, if the energy storage device satisfies the corresponding constraint conditions, determine the storage device The actual value of the power and the actual value of the state of charge of the energy device, otherwise the preset installed capacity of the distributed power supply is reduced; 第三判断单元,用于判断变压器的使用容量、线路的使用容量、节点电压或节点电压波动量是否等于各自的限值,若是,输出分布式电源的最终装机容量,并评估分布式电源并网后配电网的接纳能力,否则增加分布式电源的预设装机容量。The third judgment unit is used to judge whether the use capacity of the transformer, the use capacity of the line, the node voltage or the node voltage fluctuation are equal to their respective limits, if so, output the final installed capacity of the distributed power supply, and evaluate the grid connection of the distributed power supply The receiving capacity of the distribution network, otherwise, the preset installed capacity of the distributed power supply will be increased. 9.根据权利要求8所述的分布式电源并网能力评估装置,其特征在于,所述变压器的使用容量对应的约束条件如下式:9. The device for evaluating the grid-connected capability of distributed power sources according to claim 8, wherein the constraints corresponding to the operating capacity of the transformer are as follows: ST<ST额 S T < S T amount 其中,ST表示变压器的使用容量,ST额表示变压器的额定容量;Among them, S T represents the operating capacity of the transformer, and the amount of S T represents the rated capacity of the transformer; 所述线路的使用容量对应的约束条件如下式:The constraints corresponding to the usage capacity of the lines are as follows: SL<SL额 S L < S L amount 其中,SL表示线路的使用容量,SL额表示线路的额定容量。Among them, SL represents the use capacity of the line, and SL represents the rated capacity of the line. 10.根据权利要求8所述的分布式电源并网能力评估装置,其特征在于,所述第二判断单元具体用于:10. The device for evaluating the grid-connected capability of distributed power sources according to claim 8, wherein the second judgment unit is specifically used for: 若满足
Figure FDA0003711908890000051
Figure FDA0003711908890000052
节点电压及节点电压波动量都不超标,其中Vk表示节点k的电压,
Figure FDA0003711908890000053
Figure FDA0003711908890000054
分别表示节点k的电压下限值和上限值;dVk表示节点k的电压波动量,
Figure FDA0003711908890000055
表示节点k的电压波动限值。
if satisfied
Figure FDA0003711908890000051
and
Figure FDA0003711908890000052
The node voltage and the node voltage fluctuation are not exceeding the standard, where V k represents the voltage of node k,
Figure FDA0003711908890000053
and
Figure FDA0003711908890000054
respectively represent the lower limit and upper limit of the voltage of node k; dV k represents the voltage fluctuation of node k,
Figure FDA0003711908890000055
Represents the voltage fluctuation limit at node k.
11.根据权利要求10所述的分布式电源并网能力评估装置,其特征在于,所述储能装置对应的约束条件如下式:11. The device for evaluating the grid-connected capability of distributed power sources according to claim 10, wherein the constraints corresponding to the energy storage device are as follows:
Figure FDA0003711908890000056
Figure FDA0003711908890000056
SSOCmin≤SSOC0≤SSOCmax S SOCmin ≤S SOC0 ≤S SOCmax 其中,PE0表示储能装置的有功功率,QE0表示储能装置的无功功率,P表示储能装置的额定功率;SSOC0表示储能装置的荷电状态初始值,SSOCmin和SSOCmax分别表示储能装置的荷电状态的下限值和上限值。Among them, P E0 represents the active power of the energy storage device, Q E0 represents the reactive power of the energy storage device, P represents the rated power of the energy storage device; S SOC0 represents the initial value of the state of charge of the energy storage device, S SOCmin and S SOCmax represents the lower limit value and the upper limit value of the state of charge of the energy storage device, respectively.
12.根据权利要求11所述的分布式电源并网能力评估装置,其特征在于,所述第二判断单元具体用于:12. The device for evaluating the grid-connected capability of distributed power sources according to claim 11, wherein the second judging unit is specifically used for: 按下式确定储能装置的有功功率实际值、无功功率实际值和荷电状态实际值:Determine the actual value of the active power, the actual value of the reactive power and the actual value of the state of charge of the energy storage device as follows:
Figure FDA0003711908890000057
Figure FDA0003711908890000057
Figure FDA0003711908890000058
Figure FDA0003711908890000058
Figure FDA0003711908890000059
Figure FDA0003711908890000059
其中,PE表示储能装置的有功功率实际值,ωc表示储能装置中滤波器的截止频率,Pk表示节点k的有功功率,s表示拉普拉斯算子,h表示功率调整系数,SSOC表示储能装置的荷电状态实际值,Δt表示运行数据的采样时间间隔。Among them, PE represents the actual value of the active power of the energy storage device, ω c represents the cut-off frequency of the filter in the energy storage device, P k represents the active power of node k , s represents the Laplace operator, and h represents the power adjustment coefficient , S SOC represents the actual value of the state of charge of the energy storage device, and Δt represents the sampling time interval of the operating data.
13.根据权利要求8所述的分布式电源并网能力评估装置,其特征在于,所述第三判断单元具体用于:13. The device for evaluating the grid-connected capability of distributed power sources according to claim 8, wherein the third judging unit is specifically used for: 按下式计算分布式电源的并网收益:Calculate the grid-connected benefits of distributed power sources as follows: C=(cp+cb)Es+(cg+cb)Ep C=(c p +c b )E s +(c g +c b )E p 其中,C表示分布式电源的并网收益,Es表示分布式电源的自用电量,Ep表示上网电量,cp表示用电价格,cg表示上网价格,cb表示电量补贴价格;Among them, C represents the grid-connected income of the distributed power generation, Es represents the self-consumption electricity of the distributed power supply, Ep represents the on-grid electricity, cp represents the electricity price, c g represents the on-grid price, and c b represents the electricity subsidy price; 判断是否满足C≥Cset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,Cset表示并网收益阈值。It is judged whether C≥C set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good; otherwise, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor. 14.根据权利要求8所述的分布式电源并网能力评估装置,其特征在于,所述第三判断单元具体用于:14. The device for evaluating the grid-connected capability of distributed power sources according to claim 8, wherein the third judging unit is specifically used for: 按下式计算分布式电源并网后配电网的平均供电可用率:The average power supply availability rate of the distribution network after the distributed power grid is connected to the grid is calculated as follows:
Figure FDA0003711908890000061
Figure FDA0003711908890000061
其中,ASAI表示分布式电源并网后配电网的平均供电可用率,Nk表示节点k的用户数,Uk表示节点k的年平均故障停电时间,其单位为小时/年;Among them, ASAI represents the average power supply availability rate of the distribution network after the distributed generation is connected to the grid, N k represents the number of users of node k, and U k represents the annual average power outage time of node k, and its unit is hour/year; 判断是否满足ASAI≥ASAIset,若是,分布式电源并网后配电网的接纳能力良好,否则分布式电源并网后配电网的接纳能力差,其中ASAIset表示平均供电可用率阈值。Determine whether ASAI≥ASAI set is satisfied. If yes, the acceptance capacity of the distribution network after the distributed generation is connected to the grid is good, otherwise the acceptance capacity of the distribution network after the distributed generation is connected to the grid is poor, where ASAI set represents the average power supply availability threshold.
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