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Techniques for the Identification of Critical Nodes Leading to Voltage Collapse in a Power System

  • Isaiah Adebayo EMAIL logo , Adisa Jimoh and Adedayo Yusuff
Published/Copyright: February 22, 2018

Abstract

This paper proposes two techniques for the identification of critical buses in a power system. The technique of Network Structural Theory Participation Factor (NSTPF) depends on the network structural interconnection of buses as captured by the admittance matrix of the system and is formulated based on the fundamental circuit theory law using eigenvalue decomposition method. Another power flow based technique which depends on the system maximum loadability, the system step size among other factors is also proposed. Traditional power flow based techniques are used as benchmarks to determine the significance of the proposed methods. To ensure voltage stability enhancement, STATCOM FACTS device is installed at the selected weak load buses of the practical Nigerian 24 bus and IEEE 30 bus test systems. The results of the simulation obtained show that, the suggested approach of NSTPF is more suitable in the identification of weak buses that are liable to voltage instability in power systems as it requires less computational burden and also saves time compared to techniques based on power flow solutions.

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A

Table 8:

Bus data of the Nigerian 330kV grid power system.

Bus NoBus TypeVoltage Mag.(p.u)AnglePd (Mw)Qd (MVar)Pg (Mw)Qg (MVar)Qmin (MVar)Qmax (MVar)
111.05068.951.700−10061006
221.0500.00670.00−10301000
3010274.4205.80000
4010344.7258.50000
5010633.2474.90000
601013.810.30000
701096.572.40000
8010383.3287.50000
9010275.8206.80000
10010201.2150.90000
1121.05052.539.4431.00−10001000
12010427.0320.20000
13010177.9133.40000
14010184.6138.40000
15010114.585.90000
16010130.697.90000
1701011.08.20000
1821.0500.00.0495.00−10501050
1901070.352.70000
20010193.0144.70000
2121.0507.05.2624.70−10101010
22010199.8149.90000
2321.050320.1256.1388.90−10001000
2421.05020.615.4190.30−10001000
Table 9:

Line data of the Nigerian 330Kv grid power system.

FromToR (p.u)X (p.u)1/2BTap ratio
310.00060.00440.02951
310.00060.00440.02951
450.00070.00500.03331
450.00070.00500.03331
150.00230.01760.11761
150.00230.01760.11761
580.01100.08280.55001
580.01100.08280.55001
590.00540.04050.26691
5100.00990.07450.49491
680.00770.05760.38301
680.00770.05760.38301
280.00430.03170.21011
270.00120.00890.05891
7240.00250.01860.12371
8140.00540.04050.26911
8100.00980.07420.49301
8240.00200.01480.09821
8240.00200.01480.09821
9100.00450.03400.22571
15210.01220.09160.60891
15210.01220.09160.60891
10170.00610.04610.30641
10170.00610.04610.30641
10170.00610.04610.30641
11120.00100.00740.04911
11120.00100.00740.04911
12140.00600.04550.30251
13140.00360.02720.18071
13140.00360.02720.18071
16190.01180.08870.58921
16190.01180.08870.58921
17180.00020.00200.00981
17180.00020.00200.00981
17230.00960.07210.47931
17230.00960.07210.47931
17210.00320.02390.15891
17210.00320.02390.15891
19200.00810.06090.40461
20220.00900.06800.45161
20230.00380.02840.18861
20230.00380.02840.18861

Received: 2017-6-26
Revised: 2018-1-21
Accepted: 2018-1-28
Published Online: 2018-2-22

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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