State estimation for the distribution network with high-proportion distributed photovoltaic energy

doi:10.3969/j.issn.2097-0706.2022.10.002

Abstract

Abstract:

Being of energy conservation，environmental protection，rich reservoir，simple construction and other advantages，distributed energy has been widely connected to the power grid.It is urgent to establish a state estimation method with high accuracy and reliability for the power grid with distributed energy，in order to secure the safe operation of the grid.Taking a distribution network connected PV power generation systems as the research object，the model of the network is established.The PV nodes is switched to PQ nodes since PV has less or no reactive power.Then，a state estimation method for the distribution network connected PV systems is proposed based on an improved weighted least square method.Finally，the feasibility and effectiveness of the proposed state estimation method for the distribution network with photovoltaic energy is verified by an IEEE 33-bus system.

Key words: distribution network, state estimation, distributed energy, basic weighted least square method, photovoltaic power generation system

CLC Number:

TK9：TM711X

WANG Yi, YANG Zhiwei, WU Po, LIU Mingyang, PEI Jiecai, LI Chunlei. State estimation for the distribution network with high-proportion distributed photovoltaic energy[J]. Integrated Intelligent Energy, 2022, 44(10): 12-18.

Figures/Tables 8

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节点编号	PV接入后		PV接入前
节点编号	电压标幺值	电压相角/（°）	电压标幺值	电压相角/（°）
1	1.053 6	0.000 0	1.053 7	0.000 0
2	1.044 6	-0.558 8	1.044 7	-0.560 8
3	1.031 2	-0.493 5	1.031 2	-0.495 0
4	1.024 2	-0.414 9	1.024 3	-0.418 4
5	1.017 5	-0.328 3	1.017 4	-0.334 2
6	1.000 3	-0.336 5	1.000 3	-0.343 2
7	0.997 5	-0.510 8	0.997 5	-0.515 9
8	0.993 8	-0.485 6	0.993 9	-0.490 4
9	0.989 6	-0.534 6	0.989 7	-0.538 2
10	0.986 0	-0.575 4	0.986 0	-0.577 7
11	0.985 4	-0.572 0	0.985 5	-0.574 1
12	0.984 5	-0.568 3	0.984 6	-0.570 3
13	0.981 1	-0.633 0	0.981 2	-0.634 4
14	1.040 5	-0.680 0	1.040 5	-0.696 2
15	1.039 8	-0.704 2	1.039 8	-0.725 2
16	1.039 3	-0.730 8	1.039 2	-0.749 2

节点编号	PV接入后		PV接入前
节点编号	电压标幺值	电压相角/（°）	电压标幺值	电压相角/（°）
1	1.053 8	0.000 0	1.053 7	0.000 0
2	1.044 9	-0.523 1	1.044 7	-0.560 8
3	1.031 5	-0.447 8	1.031 2	-0.495 0
4	1.024 7	-0.355 5	1.024 3	-0.418 4
5	1.018 2	-0.251 8	1.017 4	-0.334 2
6	1.000 3	-0.269 6	1.000 3	-0.343 2
7	0.997 4	-0.470 0	0.997 5	-0.515 9
8	0.993 3	-0.455 8	0.993 9	-0.490 4
9	0.988 6	-0.532 9	0.989 7	-0.538 2
10	0.984 4	-0.600 6	0.986 0	-0.577 7
11	0.983 7	-0.599 6	0.985 5	-0.574 1
12	0.982 7	-0.599 7	0.984 6	-0.570 3
13	0.979 0	-0.688 4	0.981 2	-0.634 4
14	0.977 7	-0.747 6	0.980 0	-0.681 3
15	0.977 1	-0.780 4	0.979 4	-0.706 2
16	0.976 4	-0.804 8	0.978 8	-0.724 8

节点编号	PV接入后		PV接入前
节点编号	电压标幺值	电压相角/（°）	电压标幺值	电压相角/（°）
1	1.054 0	0.000 0	1.053 7	0.000 0
2	1.045 0	-0.549 4	1.044 7	-0.560 8
3	1.031 5	-0.472 6	1.031 2	-0.495 0
4	1.024 5	-0.399 1	1.024 3	-0.418 4
5	1.017 7	-0.318 4	1.017 4	-0.334 2
6	1.000 6	-0.338 9	1.000 3	-0.343 2
7	0.997 7	-0.507 3	0.997 5	-0.515 9
8	0.994 1	-0.475 6	0.993 9	-0.490 4
9	0.989 9	-0.513 0	0.989 7	-0.538 2
10	0.986 1	-0.541 2	0.986 0	-0.577 7
11	0.985 5	-0.535 4	0.985 5	-0.574 1
12	0.984 6	-0.527 0	0.984 6	-0.570 3
13	0.981 0	-0.570 9	0.981 2	-0.634 4
14	0.979 7	-0.607 8	0.980 0	-0.681 3
15	0.979 0	-0.629 2	0.979 4	-0.706 2
16	0.978 3	-0.641 5	0.978 8	-0.724 8

节点编号	PV接入后		PV接入前
节点编号	电压标幺值	电压相角/（°）	电压标幺值	电压相角/（°）
1	1.053 5	0.000 0	1.053 7	0.000 0
2	1.044 6	-0.563 2	1.044 7	-0.560 8
3	1.031 1	-0.498 9	1.031 2	-0.495 0
4	1.024 2	-0.421 5	1.024 3	-0.418 4
5	1.017 4	-0.336 1	1.017 4	-0.334 2
6	1.000 2	-0.340 2	1.000 3	-0.343 2
7	0.997 4	-0.508 4	0.997 5	-0.515 9
8	0.993 9	-0.477 6	0.993 9	-0.490 4
9	0.989 8	-0.513 3	0.989 7	-0.538 2
10	0.986 2	-0.540 1	0.986 0	-0.577 7
11	0.985 7	-0.534 9	0.985 5	-0.574 1
12	0.984 9	-0.527 5	0.984 6	-0.570 3
13	0.981 5	-0.570 0	0.981 2	-0.634 4
14	0.980 3	-0.613 2	0.980 0	-0.681 3
15	0.979 7	-0.633 4	0.979 4	-0.706 2
16	0.979 1	-0.645 3	0.978 8	-0.724 8