A comprehensive three-phase step voltage regulator model with efficient implementation in the Z-bus power flow

Pompodakis, Evangelos; Kryonidis, Georgios C.; Alexiadis, Minas C.

doi:10.1016/j.epsr.2021.107443

Cited by 7 publications

(6 citation statements)

References 28 publications

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“…2) For state variables of other bus j except for bus i The Jacobian matrices for the state variables of the other bus j except for bus i are represented as ( 26)- (29).…”

Section: ) Jacobian Matrices Of Pf Equations Measured Via Twmmentioning

confidence: 99%

Power Flow Model for Medium-voltage Distribution Systems Considering Measurement and Structure Characteristics

Lu,

Yan,

Huang

et al. 2024

Journal of Modern Power Systems and Clean Energy

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Medium-voltage distribution systems (MVDSs) mainly consist of a feeder head, lines, distribution transformers, and the equivalent load or power supply interfaced with the distribution transformers. The information of such load or power supply can be measured via the three-wattmeter method (THM) and the two-wattmeter method (TWM). The measurements can be used to perform the control of the power supply and simulate the characteristics of the load, so the models of the load and the power supply need to consider the measurement characteristics. Existing research works on three-phase power flow (PF) just consider the measurement characteristics of THM. Hence, the PF equation of the bus measured via TWM is firstly built. Based on conventional measurements, an accurate and general model of the grounded and ungrounded slack bus is proposed. Furthermore, the influence arising from the connection type and angle shift of distribution transformers on the admittance matrix is considered, and thus a general three-phase transformer model is summarized, which is applicable for all the transformers mentioned herein. Finally, Newton' s method is adopted to solve the PF calculation, and the performance of the proposed PF model is demonstrated through designed tests.

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“…2) For state variables of other bus j except for bus i The Jacobian matrices for the state variables of the other bus j except for bus i are represented as ( 26)- (29).…”

Section: ) Jacobian Matrices Of Pf Equations Measured Via Twmmentioning

confidence: 99%

Power Flow Model for Medium-voltage Distribution Systems Considering Measurement and Structure Characteristics

Lu,

Yan,

Huang

et al. 2024

Journal of Modern Power Systems and Clean Energy

View full text Add to dashboard Cite

show abstract

“…A three-phase SVR model is proposed in [33], the equivalent of which is depicted in Figure 1. It is a 3-bus equivalent that simulates the taps as current sources, enabling the construction of sensitivity parameters relating the tap variables with the voltages, as explained in the next section.…”

Section: Step Voltage Regulatorsmentioning

confidence: 99%

“…It is a 3-bus equivalent that simulates the taps as current sources, enabling the construction of sensitivity parameters relating the tap variables with the voltages, as explained in the next section. A three-phase SVR model is proposed in [33], the equivalent of which is depicted in Figure 1. It is a 3-bus equivalent that simulates the taps as current sources, enabling the construction of sensitivity parameters relating the tap variables with the voltages, as explained in the next section.…”

Section: Step Voltage Regulatorsmentioning

confidence: 99%

“…To derive the three-phase sensitivity parameters of LVCs, let us first assume the network of Figure 1. It includes an OLTC connected between the buses h-w [34], three single-phase capacitors connected to the three phases of bus q, and a DG connected to bus g. Furthermore, an SVR is also connected through the 3-bus equivalent circuit of [33].…”

Section: Three-phase Sensitivity Parameters Of Lvcsmentioning

confidence: 99%

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A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Voltage Controllers

Pompodakis¹,

Ahmed²,

Alexiadis

2022

Energies

Self Cite

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Local voltage controllers (LVCs) are important components of a modern distribution system for regulating the voltage within permissible limits. This manuscript presents a sensitivity-based three-phase weather-dependent power flow algorithm for distribution networks with LVCs. More specifically, the proposed algorithm has four distinct characteristics: (a) it considers the three-phase unbalanced nature of distribution systems, (b) the operating state of LVCs is calculated using sensitivity parameters having accelerated convergence, (c) it considers the precise switching sequence of LVCs based on their reaction time delays, and (d) the nonlinear influence of weather variations in the power flow is also taken into consideration. Simulations and validation results presented indicate that the proposed approach outperforms other existing algorithms with respect to the accuracy and speed of convergence, thus making it a promising power flow tool for accurate distribution system analysis.

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“…The leakage of electrical equipment generates a step voltage on the ground, which causes an electric shock to the human body (Abigail, 2019;Pompodakis et al, 2021;Aliyari et al, 2022). The existing protection measures are to install leakage protectors.…”

Section: Introductionmentioning

confidence: 99%

Power Leakage Monitoring and Warning Device for Power Grid Fault Diagnosis: Design and Field Test

Yang

Xie²,

Huang

2022

Front. Energy Res.

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Electrical equipment insulation damage, metal shell conduction on rainy days, and wire short circuits are easy to produce leakage, which form step voltage on the ground and endangers the life and safety of nearby personnel. In addition to the existing leakage protector, a new method is proposed to use leakage energy to obtain energy and early warning. The step voltage generated by the leakage current is collected through the electrode, which is rectified and reduced by the nano power LTC3588, while energy is stored in the supercapacitor for the superheterodyne transmitting module to send the leakage signal to the nearby receiving device. Based on the possibility of the superheterodyne transmitting module sending the leakage signal, it is judged whether leakage occurs here. The experimental results illustrate that when 10 mA leakage occurs in a 220 V wire, the electrode distance is 1.0 m, while the energy extraction device can obtain 360 MW of power for the superheterodyne transmitting module to send the leakage signal.

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A comprehensive three-phase step voltage regulator model with efficient implementation in the Z-bus power flow

Cited by 7 publications

References 28 publications

Power Flow Model for Medium-voltage Distribution Systems Considering Measurement and Structure Characteristics

Power Flow Model for Medium-voltage Distribution Systems Considering Measurement and Structure Characteristics

A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Voltage Controllers

Power Leakage Monitoring and Warning Device for Power Grid Fault Diagnosis: Design and Field Test

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