Voltage profile improvement based on network structural characteristics

Sikiru, Tajudeen H.; Jimoh, A.A.; Hamam, Yskandar; Agee, John T.; Ceschi, Roger

doi:10.1109/tdc-la.2012.6319054

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…On the other hand, for topologically weak networks, the compensators should be located on nodes farthest from the generators, (i.e. on buses associated with the smallest eigenvalues) [20,24] to ensure that the networks would be within the acceptable voltage limits.…”

Section: Case Study and Discussion Of Resultsmentioning

confidence: 99%

“…As previously discussed, topologically weak network have low voltages [5]. Buses associated with the smallest eigenvalues indicate where reactive power support are required [20]. Hence, to improve the overall voltage profile these buses are suitable locations for reactive power compensators [24].…”

Section: L mentioning

confidence: 94%

“…For topologically weak (ill conditioned) networks, convergence of load flow may not hold since the network is operating around point A [17]. Other approaches besides those presented in this section are necessary to identify suitable locations for reactive compensators for such networks [20]. On the other hand, topological strong networks have voltages that are between points B and C of Figure 1; however, if the loadability of the network is to be increased then suitable locations for reactive power compensators are required.…”

Section: Techniques For Assessing Reactive Powermentioning

confidence: 99%

“…The buses associated with the smallest eigenvalues in matrix LL would have the most effect on the network bus voltages as mathematically expressed in Equation (20), due to the reciprocal relationship between eigenvalues and the load voltages. From power system perspective, the smallest eigenvalue C 0 n   based on a predefined precision level, will occur when the network buses are electrically far from one another, because of the shortage of adequate reactive element within the network structure.…”

Section: L mentioning

confidence: 99%

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Reactive Power Reserve Improvement Using Power Systems Inherent Structural Characteristics

Sikiru¹,

Jimoh²,

Hamam³

et al. 2013

EPE

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This paper considers the use of the inherent structural characteristics of power system networks for improving the reactive power reserve margins for both topologically weak and strong networks. The inherent structural characteristics of the network are derived from the Schur complement of the partitioned Y-admittance matrix using circuit theory representations. Results show that topologically strong networks, operating close to the upper voltage limit could be made to increase their loadability margin by locating reactive power compensators close to generator sources, whereas topologically weak (ill conditioned) networks could be made to operate within the feasible operating limits by locating reactive power compensators on buses farther from generator sources.

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Section: Case Study and Discussion Of Resultsmentioning

confidence: 99%

Section: L mentioning

confidence: 94%

Section: Techniques For Assessing Reactive Powermentioning

confidence: 99%

Section: L mentioning

confidence: 99%

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Reactive Power Reserve Improvement Using Power Systems Inherent Structural Characteristics

Sikiru¹,

Jimoh²,

Hamam³

et al. 2013

EPE

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“…These features in the indices LL Z , LG F , GL K and GG A as shown in equations (3) to (6) above have been identified and explored in solving various power system problems in [6], [7] and [8]. Indices LG F gives the generation-to-load allocation coefficient [9].…”

Section: A the Inherent Structural Characteristics Theory Approachmentioning

confidence: 99%

Inherent structural characteristics approach for solving loss allocation problems

Alayande

Jimoh

Yusuff

2015

2015 4th International Conference on Electric Power and Energy Conversion Systems (EPECS)

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The solution to the well-known loss allocation problems in interconnected power networks has usually been through power-flow analysis. This power-flow based approach is computationally intensive and the results may not converge for large practical power systems. This paper, therefore, explores an alternative approach to solving this problem using the Inherent Structural Characteristics Theory (ISCT) [6]. The total transmission loss within power network based on both the ISCT and power-flow-based approach is determined, and then used to allocate losses to loads in the network. The results obtained from the two approaches are compared. The ISCT approach, apart from being faster, allocates the total loss within the network to loads in a fairer, equitable and transparent manner. Matlab 2013a is employed as a simulation tool. The sparsity inherent in power networks is explored to reduce the computational intensity and computer memory required. This new approach is tested on a standard IEEE 14-bus system and a practical system of the Nigerian 40-bus network. The results obtained from the simulations show the ISCT approach to be superior.

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Visualizing voltage relationships using the unity row summation and real valued properties of the F matrix

Dassios

Cuffe

Keane

2016

Electric Power Systems Research

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Electrical power system calculations rely heavily on the Y bus matrix, which is the Laplacian matrix of the network under study, weighted by the complex-valued admittance of each branch. It is often useful to partition the Y bus into four submatrices, to separately quantify the connectivity between and among the load and generation nodes in the network. Simple manipulation of these submatrices gives the F LG matrix, which offers useful insights on how voltage deviations propagate through a power system and on how energy losses may be minimized. Various authors have observed that in practice the elements of F LG are real-valued and its rows sum close to one: the present paper explains and proves these properties.

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Voltage profile improvement based on network structural characteristics

Cited by 16 publications

References 18 publications

Reactive Power Reserve Improvement Using Power Systems Inherent Structural Characteristics

Reactive Power Reserve Improvement Using Power Systems Inherent Structural Characteristics

Inherent structural characteristics approach for solving loss allocation problems

Visualizing voltage relationships using the unity row summation and real valued properties of the F matrix

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