CN112886597A - 一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法 - Google Patents

一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法 Download PDF

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CN112886597A
CN112886597A CN202110086127.XA CN202110086127A CN112886597A CN 112886597 A CN112886597 A CN 112886597A CN 202110086127 A CN202110086127 A CN 202110086127A CN 112886597 A CN112886597 A CN 112886597A
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CN112886597B (zh
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朱俊澎
袁越
傅质馨
吕志勇
施凯杰
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Hohai University HHU
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/28The renewable source being wind energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

本发明公开了一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,包括如下步骤:建立辐射状配网中上游节点集合和共有上游节点集合表达式;建立任意节点电压幅值平方项关于支路功率的表达式;建立任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系;建立多个新能源注入功率波动时节点电压平方项的表达式;建立新能源注入功率不确定性用仿射表示时,各节点电压平方的仿射解析表达式。本发明在考虑新能源注入功率不确定性时,得到节点电压平方的波动范围,从而对节点电压的越限情况进行理论分析,提升配电系统运行的安全性,并且能够为新能源在配网中的规划和运行控制提供理论支撑。

Description

一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析 计算方法
技术领域
本发明属于配电网控制、运行与优化领域,具体涉及一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法。
背景技术
分布式光伏、风电等新能源发电在配网中的渗透率逐步提升。新能源功率注入辐射状配电网,可能引起配网中的功率倒送,从而抬高新能源接入节点的电压,甚至出现电压越限的情况。在新能源渗透率较高的局部配网,已经出现了因为电压越限而无法对新能源进行完全消纳的情况。同时,新能源发电功率出力具有一定的不确定性,对配电网电压状况的分析带来一定的困难,分析考虑新能源功率不确定时的电网电压幅值分布,已成为新能源在配网中的规划和运行时的重要问题。
现有的配网仿射潮流分析中,通常依赖仿射计算规则,基于潮流方程等式进行理论分析,而没有给出某一任意节点新能源功率波动对电网中其它任意节点电压幅值影响的解析表达式,也没有给出当电网中存在多个节点新能源功率波动时,电网中各节点电压的关于功率波动值的解析表达式。
所以,需要一个新的技术方案来解决这些问题。
发明内容
发明目的:为了克服现有技术中存在的不足,提供一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其可以在考虑新能源注入功率不确定性时,得到节点电压平方的波动范围,从而对节点电压的越限情况进行理论分析,提升配电系统运行的安全性,并且能够为新能源在配网中的规划和运行控制提供理论支撑。
技术方案:为实现上述目的,本发明提供一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,包括如下步骤:
S1:建立辐射状配网中上游节点集合和共有上游节点集合表达式;
S2:基于上游节点集合,建立任意节点电压幅值平方项关于支路功率的表达式;基于共有节点集合,建立任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系;
S3:根据步骤S2获取的任意节点电压幅值平方项关于支路功率的表达式和任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系,建立多个新能源注入功率波动时节点电压平方项的表达式;
S4:建立新能源注入功率不确定性用仿射表示时,各节点电压平方的仿射解析表达式。
进一步地,所述步骤S1中上游节点集合和共有上游节点集合的表达式分别为式(1)和式(2):
Figure BDA0002910872640000021
Figure BDA0002910872640000022
式(1)中,Φup(j)为节点j的上游节点集合,w(n)为辐射状配网中以变电站节点为根节点时节点n的子节点集合;式(2)中,
Figure BDA0002910872640000023
为节点j和节点i的共有上游节点集合。
进一步地,所述步骤S2中节点电压幅值平方项关于支路功率的表达式为:
Figure BDA0002910872640000024
式(3)中,
Figure BDA0002910872640000025
Figure BDA0002910872640000026
分别为以变电站节点为根节点时由k节点的父节点流向k节点的有功和无功功率;rk和xk分别为以变电站节点为根节点时k节点的父节点到k节点支路的电阻和电抗;
Figure BDA0002910872640000027
为i节点电压幅值的平方,Usqr,ref为变电站节点电压幅值的平方。
进一步地,所述步骤S2中任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系如下:
Figure BDA0002910872640000028
Figure BDA0002910872640000029
Figure BDA00029108726400000210
式(4)和式(5)中,
Figure BDA00029108726400000211
Figure BDA00029108726400000212
分别定义为节点i和节点j之间的有功电压影响因子和无功电压影响因子;式(6)中,
Figure BDA00029108726400000213
Figure BDA00029108726400000214
为j节点新能源注入功率的有功和无功波动值,
Figure BDA00029108726400000215
为由j节点新能源注入功率波动引起的i节点电压幅值平方波动值。
进一步地,所述步骤S3中,多个新能源注入功率波动时节点电压平方项的表达式为:
Figure BDA00029108726400000216
式(7)中,ΦR为配网中含有新能源注入功率的节点的集合。
进一步地,所述步骤S4中节点电压平方的仿射解析表达式为:
Figure BDA00029108726400000217
Figure BDA0002910872640000031
Figure BDA0002910872640000032
式(8)和式(9)中,
Figure BDA0002910872640000033
Figure BDA0002910872640000034
分别为k节点新能源注入的有功和无功功率;
Figure BDA0002910872640000035
Figure BDA0002910872640000036
分别为k节点注入有功和无功功率不确定量的中心值;εn为噪声元;Pk,n和Qk,n为噪声元系数,分别表示噪声元i对不确定量
Figure BDA0002910872640000037
Figure BDA0002910872640000038
的影响程度;式(10)中,
Figure BDA0002910872640000039
为新能源注入功率不确定性用仿射表示时,节点i电压平方的仿射解析表达式,
Figure BDA00029108726400000310
为各新能源不确定注入量均取中心值时,根据确定性潮流求解得到的节点i的电压幅值平方值。
有益效果:本发明与现有技术相比,给出了任意两个节点之间的有功电压影响因子和无功电压影响因子,可以明确地分析多个新能源接入时,每个新能源功率的波动值对电压分布波动的影响权重,从而更加明确地揭示节点电压波动的原因,对于高渗透率新能源在配网中的规划和运行具有重要的价值。
附图说明
图1为本发明方法的流程示意图;
图2为本实施例中采用的电网结构图。
具体实施方式
下面结合附图和具体实施例,进一步阐明本发明,应理解这些实施例仅用于说明本发明而不用于限制本发明的范围,在阅读了本发明之后,本领域技术人员对本发明的各种等价形式的修改均落于本申请所附权利要求所限定的范围。
如图1所示,本发明提供一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,包括如下步骤:
S1:建立辐射状配网中上游节点集合和共有上游节点集合表达式:
上游节点集合和共有上游节点集合的表达式分别为式(1)和式(2):
Figure BDA00029108726400000311
Figure BDA00029108726400000312
式(1)中,Φup(j)为节点j的上游节点集合,w(n)为辐射状配网中以变电站节点为根节点时节点n的子节点集合;式(2)中,
Figure BDA00029108726400000313
为节点j和节点i的共有上游节点集合。
S2:基于上游节点集合,建立任意节点电压幅值平方项关于支路功率的表达式:
节点电压幅值平方项关于支路功率的表达式为:
Figure BDA00029108726400000314
式(3)中,
Figure BDA0002910872640000041
Figure BDA0002910872640000042
分别为以变电站节点为根节点时由k节点的父节点流向k节点的有功和无功功率;rk和xk分别为以变电站节点为根节点时k节点的父节点到k节点支路的电阻和电抗;
Figure BDA00029108726400000418
为i节点电压幅值的平方,Usqr,ref为变电站节点电压幅值的平方。
S3:基于共有节点集合,建立任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系:
任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系如下:
Figure BDA0002910872640000043
Figure BDA0002910872640000044
Figure BDA0002910872640000045
式(4)和式(5)中,
Figure BDA0002910872640000046
Figure BDA0002910872640000047
分别定义为节点i和节点j之间的有功电压影响因子和无功电压影响因子;式(6)中,
Figure BDA0002910872640000048
Figure BDA0002910872640000049
为j节点新能源注入功率的有功和无功波动值,
Figure BDA00029108726400000410
为由j节点新能源注入功率波动引起的i节点电压幅值平方波动值。
S4:根据获取的任意节点电压幅值平方项关于支路功率的表达式和任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系,建立多个新能源注入功率波动时节点电压平方项的表达式:
多个新能源注入功率波动时节点电压平方项的表达式为:
Figure BDA00029108726400000411
式(7)中,ΦR为配网中含有新能源注入功率的节点的集合。
S5:建立新能源注入功率不确定性用仿射表示时,各节点电压平方的仿射解析表达式:
节点电压平方的仿射解析表达式为:
Figure BDA00029108726400000412
Figure BDA00029108726400000413
Figure BDA00029108726400000414
式(8)和式(9)中,
Figure BDA00029108726400000415
Figure BDA00029108726400000416
分别为k节点新能源注入的有功和无功功率;
Figure BDA00029108726400000417
Figure BDA0002910872640000051
分别为k节点注入有功和无功功率不确定量的中心值;εn为噪声元;Pk,n和Qk,n为噪声元系数,分别表示噪声元i对不确定量
Figure BDA0002910872640000052
Figure BDA0002910872640000053
的影响程度;式(10)中,
Figure BDA0002910872640000054
为新能源注入功率不确定性用仿射表示时,节点i电压平方的仿射解析表达式,
Figure BDA0002910872640000055
为各新能源不确定注入量均取中心值时,根据确定性潮流求解得到的节点i的电压幅值平方值。
基于上述方案,本实施例将上述方法进行应用和分析,具体如下:
本实施例中,选取修改过的IEEE 33节点系统作为配网算例,在原始测试系统的基础上,分别在节点17,22,31接入新能源,如图2所示。IEEE 33节点的参数如表1所示。
表1 IEEE 33节点标准算例参数
Figure BDA0002910872640000056
新能源不确定性的仿射表示为:
Figure BDA0002910872640000057
Figure BDA0002910872640000061
Figure BDA0002910872640000062
根据仿射潮流解析计算方法,可以计算得到各节点电压幅值的上界和下界。为了验证解析计算的正确性,采用蒙特卡洛模拟方法进行验证。根据式(11)-(13),随机生成10000组17、22、31节点新能源的功率值,并进行确定性潮流计算,可得到各节点电压幅值的最大值和最小值,将解析计算的结果与蒙特卡洛模拟结果进行对比,如表2所示。
表2节点电压幅值解析计算与仿真验证
Figure BDA0002910872640000063
Figure BDA0002910872640000071
由表2可知,根据本发明提供的仿射潮流解析计算的方法,解析计算得到的电压幅值下界与蒙特卡洛模拟中的节点电压幅值最小值基本一致,误差不超过0.3%;解析计算得到的电压幅值上界与蒙特卡洛模拟中的节点电压幅值最大值基本一致,误差不超过0.2%,从而验证了本发明提供的仿射潮流解析计算方法的正确性。
同时,根据本实施例的结果,在现有的新能源出力特征下,节点电压幅值最大值已经超过通常配电系统运行所允许的上限(1.05p.u.),在新能源运行过程中应该有适当的切机或电压调节措施,以保证电力系统运行的安全性,体现了本发明所提供的解析计算方法的有益效果。

Claims (6)

1.一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,包括如下步骤:
S1:建立辐射状配网中上游节点集合和共有上游节点集合表达式;
S2:基于上游节点集合,建立任意节点电压幅值平方项关于支路功率的表达式;基于共有节点集合,建立任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系;
S3:根据步骤S2获取的任意节点电压幅值平方项关于支路功率的表达式和任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系,建立多个新能源注入功率波动时节点电压平方项的表达式;
S4:建立新能源注入功率不确定性用仿射表示时,各节点电压平方的仿射解析表达式。
2.根据权利要求1所述的一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,所述步骤S1中上游节点集合和共有上游节点集合的表达式分别为式(1)和式(2):
Figure FDA0002910872630000011
Figure FDA0002910872630000012
式(1)中,Φup(j)为节点j的上游节点集合,w(n)为辐射状配网中以变电站节点为根节点时节点n的子节点集合;式(2)中,
Figure FDA0002910872630000013
为节点j和节点i的共有上游节点集合。
3.根据权利要求1所述的一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,所述步骤S2中节点电压幅值平方项关于支路功率的表达式为:
Figure FDA0002910872630000014
式(3)中,
Figure FDA0002910872630000015
Figure FDA0002910872630000016
分别为以变电站节点为根节点时由k节点的父节点流向k节点的有功和无功功率;rk和xk分别为以变电站节点为根节点时k节点的父节点到k节点支路的电阻和电抗;
Figure FDA0002910872630000017
为i节点电压幅值的平方,Usqr,ref为变电站节点电压幅值的平方。
4.根据权利要求1所述的一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,所述步骤S2中任意节点新能源注入功率波动时引起的其它节点电压幅值平方项波动的对应关系如下:
Figure FDA0002910872630000018
Figure FDA0002910872630000021
Figure FDA0002910872630000022
式(4)和式(5)中,
Figure FDA0002910872630000023
Figure FDA0002910872630000024
分别定义为节点i和节点j之间的有功电压影响因子和无功电压影响因子;式(6)中,
Figure FDA0002910872630000025
Figure FDA0002910872630000026
为j节点新能源注入功率的有功和无功波动值,
Figure FDA0002910872630000027
为由j节点新能源注入功率波动引起的i节点电压幅值平方波动值。
5.根据权利要求1所述的一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,所述步骤S3中,多个新能源注入功率波动时节点电压平方项的表达式为:
Figure FDA0002910872630000028
式(7)中,ΦR为配网中含有新能源注入功率的节点的集合。
6.根据权利要求1所述的一种考虑新能源出力不确定性的辐射状配电网仿射潮流解析计算方法,其特征在于,所述步骤S4中节点电压平方的仿射解析表达式为:
Figure FDA0002910872630000029
Figure FDA00029108726300000210
Figure FDA00029108726300000211
式(8)和式(9)中,
Figure FDA00029108726300000212
Figure FDA00029108726300000213
分别为k节点新能源注入的有功和无功功率;
Figure FDA00029108726300000214
Figure FDA00029108726300000215
分别为k节点注入有功和无功功率不确定量的中心值;εn为噪声元;Pk,n和Qk,n为噪声元系数,分别表示噪声元i对不确定量
Figure FDA00029108726300000216
Figure FDA00029108726300000217
的影响程度;式(10)中,
Figure FDA00029108726300000218
为新能源注入功率不确定性用仿射表示时,节点i电压平方的仿射解析表达式,
Figure FDA00029108726300000219
为各新能源不确定注入量均取中心值时,根据确定性潮流求解得到的节点i的电压幅值平方值。
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