Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System
Abstract
:1. Introduction
2. Modeling and Characteristic Analysis of the Harmonic Current of the Inverter
2.1. Structure and Control of the Inverter
2.2. Parameterization of LCL Filter
2.2.1. Parameter of Inverter Side Inductor L1
2.2.2. Parameter of Filter Capacitor C
2.2.3. Parameter of Grid-Side Inductor L2
2.3. Modeling of Harmonic Current of Inverter
2.3.1. Low-Frequency Harmonics Caused by External Harmonic Sources
2.3.2. High Harmonic Caused by Internal Harmonic Sources
2.3.3. Simulation Validation
2.4. Characteristic Analysis of Harmonic Current
3. Analysis of Inverter Resonance Mechanism
3.1. Mechanism of Resonance Induced by Grid Voltage Feed-Forward Links
3.2. Impedance Modeling and Resonance Analysis of Multi-Inverter Grid-Connected Systems
4. Impedance Remodeling Harmonic Resonance Suppression Method for Multi-Inverter Grid-Connected Systems
4.1. Improved WACC Current Control Strategy
4.2. PCC Point-Parallel Virtual Conductance Strategy
4.3. Comparison of the Effects of Different Methods
5. Simulation Verification
5.1. Verification of Single Inverter Operating Conditions without Background Harmonics
5.2. Verification of Single and Multiple Inverter Operating Conditions with Background Harmonics
5.3. Comparison and Verification of Different Strategies
6. Conclusions
- (1)
- The high-frequency characteristics of the inverter tend to be filtered by the LCL filter to very small values until they are negligible. The harmonics of the inverter are mainly distributed at low frequencies.
- (2)
- The decomposed conductance model is more suitable for the modal analysis method for system resonance characterization than the traditional Norton circuit model, which can better reflect the response characteristics between the inverter and the grid. The modal analysis method can reflect the resonance information of the multi-inverter system.
- (3)
- The impedance remodeling method proposed in this paper is more suitable for resonance suppression of multi-inverter grid-connected systems in background harmonic scenarios than other schemes, and it can further reduce the output harmonic currents while meeting the engineering requirements.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Methods | Realization | Advantages | Drawbacks |
---|---|---|---|
Passive damping method [22] | This is accomplished by connecting resistors in series or parallel to the inductive or capacitive branches of the LCL filter. | It is simple, easy to implement and effective | Energy losses due to passive damping resistors cannot be avoided. |
Active damping method [29] | It is the virtualization of the damping resistor through the control algorithm that ensures the damping effect and avoids the energy consumption of the damping resistor. | A good suppression effect is achieved without additional energy loss. | The requirements for the inverter control circuit are very high. |
Active damper method [30] | Active dampers are additional devices independent of the grid-connected inverter system. | It can be set independently without affecting the work of other inverters. | Research in resonance detection is not advanced enough to require additional construction and maintenance costs. |
Impedance remodeling method [28] | Changing the system impedance destroys the resonance conditions of the system and thus acts as a resonance suppressor. | It will not add extra energy loss and can achieve a better suppression effect. | The algorithm is complex and demanding on the inverter control circuit. |
Parameters | Symbol | Value |
---|---|---|
Power grid voltage | Ug/V | 220 |
Power grid impedance | Lg/mH | 0.1 |
Inverter side inductor | L1/mH | 1.2 |
Grid-side inductance | L2/mH | 0.3 |
Filter capacitor | C/μF | 28 |
Quasi-proportional resonance controller parameters | kp | 3 |
ki | 100 | |
ωi/rad·s−1 | 5 | |
Capacitive current feedback coefficient | Hi1 | 3 |
Grid-connected current feedback coefficient | Hi2 | 1 |
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Zhang, M.; Wang, J.; Zhang, S.; Gao, L.; Guo, X.; Chen, L.; Xu, Y. Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System. Electronics 2023, 12, 3684. https://doi.org/10.3390/electronics12173684
Zhang M, Wang J, Zhang S, Gao L, Guo X, Chen L, Xu Y. Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System. Electronics. 2023; 12(17):3684. https://doi.org/10.3390/electronics12173684
Chicago/Turabian StyleZhang, Min, Jinhao Wang, Shifeng Zhang, Le Gao, Xiangyu Guo, Lin Chen, and Yonghai Xu. 2023. "Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System" Electronics 12, no. 17: 3684. https://doi.org/10.3390/electronics12173684