Fault characteristics of full power inverted sources and its short‐circuit current calculation model

Zhang, Chi; Zeng, Jie; Zhao, Wei; Zhong, Guobin; Zhang, Wei; Li, Weiren; Dai, Ming

doi:10.1049/joe.2017.0773

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…Chi et al proposed a computational model for simulating the current fault problem and performed a parametric algorithm for it. In the course of their research, they verified the practical utility of the model through simulation experiments [4]. e mentioned researchers have made a detailed description of the short-circuit current calculation of related photovoltaic power plants, but there is no clear description of the construction of their models and the use of related algorithms.…”

Section: Introductionmentioning

confidence: 99%

Practical Model for Short-Circuit Current Calculation of Photovoltaic Power Station Based on Improved RLS Algorithm

Sun¹,

Liu²,

Zheng³

2022

International Transactions on Electrical Energy Systems

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In recent years, with the rapid economic development, the development speed of all walks of life has entered a new level, and the power industry has also developed rapidly. Driven by market demand, China’s power transmission range and power transmission capacity will enter a new level. At the same time, the problems brought about by the development of the power system are equally severe. Due to the large load density in individual areas, the detection of short-circuit current must be improved as an important issue. The purpose of this paper is to study how to improve the practical model of short-circuit current calculation of photovoltaic power plants, so that it can be well applied to the current high-density current detection in China. Therefore, this paper improves the recursive least squares (RLS) algorithm and applies it to the practical model of short-circuit current calculation of photovoltaic power plants and describes the improvement process of the algorithm in detail. At the same time, this paper designs relevant experiments and analysis to count the data of the improved RLS algorithm in the short-circuit current calculation of the actual photovoltaic power station and combines the data of this part to test and analyze the ability of the algorithm. The experimental results in this paper show that the improved RLS algorithm has a very good improvement in the calculation accuracy of the short-circuit current calculation of photovoltaic power plants in the actual model calculation. At the same time, the calculation efficiency is also improved, and the current tracking effect is also improved by 7%.

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Section: Introductionmentioning

confidence: 99%

Practical Model for Short-Circuit Current Calculation of Photovoltaic Power Station Based on Improved RLS Algorithm

Sun¹,

Liu²,

Zheng³

2022

International Transactions on Electrical Energy Systems

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“…Te transfer functions G 1 (s) and G 2 (s) in equation ( 2) are substituted into (13) and simplifed to obtain where i + α (t 0 ) and i + β (t 0 ) are the initial values of positive sequence currents output by GSC in the two-phase stationary coordinate frame at the fault moment; and f 1 (s) and f 2 (s) are the oscillation attenuation components generated in the simplifcation process, and the specifc expressions can be expressed as…”

Section: Circuit Equation In Dq-axis Coordinate Frame Of Positive Seq...mentioning

confidence: 99%

“…Te industry has also carried out extensive research and achieved some results in consideration of its important role in studying the action behavior of relay protection. On the basis of the comprehensive analysis of the converter power supply control system, a calculation model of the fault current of the converter power supply with a low-voltage ride-through control strategy is proposed in [13], and the transient short-circuit current of the converter power supply is calculated by using the transfer functions in the complex frequency domain of both the control system and converter [14], starting with the mathematical model of the control system, which describes the output current of the inverter after the fault in the form of second-order, constant coefcient diferential equations, and the current expression in the transient process is obtained analytically based on the steady-state value before and after the fault and the transient change law afected by the control parameters. Te authors of [15] describe the positive and negative sequence current after fault as second-order, constant coefcient diferential equations, and the short-circuit current expressions based on the independent control strategy of positive and negative sequence are derived.…”

Section: Introductionmentioning

confidence: 99%

Calculation Method and Characteristic Analysis for Fault Current of Permanent Magnet Direct-Drive Wind Power System considering Positive and Negative Sequence Decomposition

Li,

Zhong,

Wen

et al. 2024

International Transactions on Electrical Energy Systems

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In view of the fact that the influence of positive and negative sequence decomposition, which is widely used in positive and negative sequence decoupling control in control system, on the fault current calculation process is not deeply considered in the existing transient analysis methods of permanent magnet direct-drive wind farm short circuit current, this paper proposes a transient short circuit current calculation model that takes into account positive and negative sequence decomposition. The influence of the transient characteristics of positive and negative sequence decomposition on the control system is studied, and the mechanism of its action on the transient change of short circuit current is revealed. The positive and negative sequence decoupling processes of the circuit equation are modified, and the characteristics of the coupling equation are analyzed. The difference in the converter output voltage between the circuit equation and the control equation and the depth of its influence on the calculation process is revealed. On the basis of quantifying the difference at the converter output voltage, the circuit equation and the control equation are combined to form a short-circuit current calculation model with positive and negative sequence decomposition, which accurately characterizes the transient characteristics of fault current under different voltage drops and effectively improves the accuracy of the calculation results.

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“…If the active current is below the maximum allowed current, the remaining capacity is used to inject the reactive current. The available reactive current is given by Equation ( 13), and the effective multiplier is determined by Equation (14).…”

Section: Mode P-priority To the Active Power Injectionmentioning

confidence: 99%

Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis

Teixeira

Leite

2021

Energies

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Voltage source converters (VSCs) are self-commutated converters able to generate AC voltages with or without the support of an AC connecting grid. VSCs allow fast control of active and reactive powers in an independent way. VSCs also have black start capability. Their use in high-voltage direct current (HVDC) systems, comparative to the more mature current source converter (CSC)-based HVDC, offers faster active power flow control. In addition, VSCs provide flexible reactive power control, independent at each converter terminal. It is also useful when connecting DC sources to weak AC grids. Steady-state RMS analysis techniques are commonly used for early-stage analysis, for design purposes and for relaying. Sources interfaced through DC/AC or AC/DC/AC converters, opposite to conventional generators, are not well represented by electromotive forces (E) behind impedance models. A methodology to include voltage source converters (VSCs) in conventional RMS short-circuit analysis techniques is advanced in this work. It represents an iterative procedure inside general calculation techniques and can even be used by those with only basic power electronics knowledge. Results are compared to those of the commercial software package PSS®CAPE to demonstrate the validity of the proposed rmsVSC algorithm.

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Fault characteristics of full power inverted sources and its short‐circuit current calculation model

Cited by 3 publications

References 3 publications

Practical Model for Short-Circuit Current Calculation of Photovoltaic Power Station Based on Improved RLS Algorithm

Practical Model for Short-Circuit Current Calculation of Photovoltaic Power Station Based on Improved RLS Algorithm

Calculation Method and Characteristic Analysis for Fault Current of Permanent Magnet Direct-Drive Wind Power System considering Positive and Negative Sequence Decomposition

Integration of Voltage Source Converters in Steady-State RMS Short-Circuit Analysis

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