An Improved Islanding Detection Method for a Grid-Connected Inverter With Intermittent Bilateral Reactive Power Variation

Zhang, Jun; Xu, Dehong; Shen, Ge; Zhu, Ye; He, Ning; Ma, Jie

doi:10.1109/tpel.2012.2196713

Cited by 91 publications

(55 citation statements)

References 21 publications

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“…Fig.6 shows the configuration of a GE PMSG connected to grid via an inverter. The three-phase AC voltage generated by the synchronous generator is firstly converted into DC voltage (at Cdc) through an uncontrolled rectifier and a boost circuit, and then into three-phase AC voltage in the PWM form through a 3-phase fully controlled inverter [27]- [37] . The external disturbance-generating device injects transient disturbance signal into the system from the PCC.…”

Section: B Impedance Model Of Grid-connected Inverter Under Externalmentioning

confidence: 99%

An Islanding Detection Method for Multi-DG Systems Based on High-Frequency Impedance Estimation

Jia

Wei

et al. 2017

IEEE Trans. Sustain. Energy

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Abstract--Active islanding detection methods are generally employed for grid-connected inverter-based Distributed Generation (DG). However, there might be mutual influences and power quality issues caused by the disturbance signal when multiple inverters are involved. To address those problems, this paper analyzes the potential failure mechanism of the f-Q (frequency-reactive power) drifting active method in multiple-DG situations. Then, a novel high frequency transient injection based islanding detection method that is suitable for both single and multiple-DGs is proposed. Compared with the conventional injection methods, a high frequency impedance model for DG is provided for better theoretical analysis. By means of the intermittent Time Domain Low Voltage Condition (TDLVC) injection control, this method can achieve good accuracy and reduce disturbances to power system.  Index Terms--Islanding detection, active injection method, high frequency impedance estimation, multi-inverter-based DG.

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Section: B Impedance Model Of Grid-connected Inverter Under Externalmentioning

confidence: 99%

An Islanding Detection Method for Multi-DG Systems Based on High-Frequency Impedance Estimation

Jia

Wei

et al. 2017

IEEE Trans. Sustain. Energy

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“…Based on (2)(3)(4)(5), the following equations can be developed for revealing the relationship between the local load resistance R and |Z pcc (jω 1 )| when an island is formed [27],…”

Section: B Identification Of the Islanding Conditionmentioning

confidence: 99%

“…Existing islanding detection methods that are based on measurements local to the DG may be classified as active methods and passive methods [4][5]. Active islanding detection methods measure the responses to disturbances that are intentionally injected into the EPS with decision making embedded within the control algorithms of the DG.…”

Section: Introductionmentioning

confidence: 99%

A Reference Impedance-Based Passive Islanding Detection Method for Inverter-Based Distributed Generation System

Liu

Diduch

Chang

et al. 2015

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper proposes a passive islanding detection method based on computing a set of frequency dependent reference impedance magnitudes and comparing them with the measured impedance magnitudes at the point of common coupling (PCC). The reference impedance may be identified online over a selected frequency band from the measured voltage and current at PCC. Islanding is detected when the magnitude differences between reference impedance and measured impedance over the chosen frequency band are smaller than a preset threshold. Robustness of the proposed method is verified in a distribution network, the method avoids misdiagnosing islanding condition as normal condition. Performance analyses are discussed from two perspectives of non-detection zone (NDZ) and fault detection zone (FDZ). By combining the under voltage/over voltage (UV/OV) and under frequency/over frequency (UF/OF) methods with the proposed method, the NDZs of UV/OV and UF/OF methods can be reduced.

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“…It does not introduce any current distortion compared to other active anti-islanding techniques. In traditional intermittent bilateral RPV method, a minimum reactive power reference as a percent of DG active power is required to deviate frequency and hit the threshold limit after islanding [9]. PFFS method injects reactive power depending on frequency deviation from nominal [10].…”

Section: Introductionmentioning

confidence: 99%

A hybrid active islanding detection technique for single-phase inverter-based distributed generation system

Kothari

Fernandes

2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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Islanding detection is mandatory for grid connected inverter-based distributed generation systems. At present, there are passive, active, hybrid and communication based islanding detection techniques. The effectiveness of these methods depends on the Non-Detection Zone (NDZ), cost, complexity and degradation in inverter output power quality. This paper analyses various possibilities of active/reactive power mismatch during grid disconnection and its impact on voltage amplitude and frequency at the Point of Common Coupling (PCC). An inverterbased Distributed Generation (DG) system operating in constant power mode, interconnected with local RLC load and the grid is considered for analysis. An active islanding detection technique based on the combination of Reactive Power Variation (RPV) and Positive Feedback Frequency Shift (PFFS) is proposed in this paper. This technique eliminates NDZ and accelerates the speed of islanding detection without degrading the inverter power quality. A detailed simulation study of the proposed islanding detection technique with several case studies of active/reactive power mismatch is carried out using MATLAB/Simulink. The proposed islanding detection technique is verified on Hardware in Loop (HIL) system implemented using Real Time Windows Target (RTWT) of MATLAB/Simulink, NI PCIe-6251 Data Acquisition Card (DAC) and TMS320F28335 controller.

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An Improved Islanding Detection Method for a Grid-Connected Inverter With Intermittent Bilateral Reactive Power Variation

Cited by 91 publications

References 21 publications

An Islanding Detection Method for Multi-DG Systems Based on High-Frequency Impedance Estimation

An Islanding Detection Method for Multi-DG Systems Based on High-Frequency Impedance Estimation

A Reference Impedance-Based Passive Islanding Detection Method for Inverter-Based Distributed Generation System

A hybrid active islanding detection technique for single-phase inverter-based distributed generation system

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