Frequency Adaptive Proportional-Repetitive Control for Grid-Connected Inverters

Ye, Jie; Liu, Linguo; Shen, Anwen

doi:10.1109/tie.2020.3016247

Cited by 49 publications

(15 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, the proposed system is tested for 51Hz, 50.5Hz and 50Hz to evaluate its performance when the grid frequency is greater than its rated value of 50Hz and the results are given in Figure 19(a). The extracted results of Figure 19(a) are compared with the other techniques mentioned [34] and [35] in Table 6.…”

Section: B Case 2: Test For Frequency Variationmentioning

confidence: 99%

“…Again the system is found stable and the adaptive harmonic compensators show promising results as given in Figure 19(b). For these values of grid frequency the system is compared with [34] and [35] in Table 6 which shows that the proposed system is performing better than other techniques. At a lower rating when the grid current is 25A, the proposed system is tested and it is found that it has almost similar or better performance as compared to the 3-level inverter given in [36].…”

Section: B Case 2: Test For Frequency Variationmentioning

confidence: 99%

See 1 more Smart Citation

An Adaptive Hybrid Control of Reduced Switch Multilevel Grid Connected Inverter for Weak Grid Applications

et al. 2023

View full text Add to dashboard Cite

Grid-connected inverters have a very significant role in the integration of renewable energy resources with utility grids. However, in recent studies, it is revealed that grid-connected inverters are vulnerable to instability when the nature of the grid changes from strong to weak, which produces uncertainty and performance degradation. An increase in grid impedance decreases stability margins, tremendously increases total harmonic distortion after a certain limit, and amplifies the voltage harmonics in the grid. A cascaded reduced switch symmetrical multilevel inverter along with an adaptive hybrid control technique is proposed for injecting power generated from distributed energy resources efficiently and stably to the utility grid. This research contributes twofold: a multilevel inverter topology and the other is its control method. The multilevel inverter reduces total harmonic distortion and size of the filter while increasing power handling capability. The control unit of the proposed system further consists of two parts: one is the synchronous frame current controller, and the other is stationary frame adaptive harmonic compensators. The grid current controller which is working in a synchronous reference frame ensures regulated current injection to the grid. It is not favorable to implement a harmonic compensator in a synchronous reference frame due to computation complexities. Therefore, the stationary reference frame controllers are used for harmonic compensations. But the resultant harmonic compensators have narrow bandwidth. Thus, these are not robust against variation in grid frequency. In this research, this problem is resolved by adding the adaptive features within the harmonic compensators which shift its passing band according to the frequency of the grid while remaining with the same bandwidth. The proposed design of the hybrid frame controller is validated by considering a nine-level inverter connected with a weak grid.INDEX TERMS Adaptive harmonic compensators, Grid-connected inverters, harmonic compensators, multilevel inverters, phase disposition level shift carrier pulse width modulation, reduced switch multilevel inverters, total harmonic distortion, weak grid. I. INTRODUCTIONG RID connected inverters(GCIs) play an important role in enabling the use of renewable energy resources. It is used to connect Distributed Generators(DGs) with the existing grid or within a microgrid. Most of the renewable energy resources are intermittent in nature [1] [2]. Thus, the energy produced is affected by environmental conditions like weather, temperature, sunlight, speed of the wind and

show abstract

Section: B Case 2: Test For Frequency Variationmentioning

confidence: 99%

Section: B Case 2: Test For Frequency Variationmentioning

confidence: 99%

An Adaptive Hybrid Control of Reduced Switch Multilevel Grid Connected Inverter for Weak Grid Applications

et al. 2023

View full text Add to dashboard Cite

show abstract

“…where D is the desired delay and M is the order of the filter, [28].The coefficients for the Lagrange FD filters with M =1, 2, and 3 are given in the Table . 1.…”

Section: Design Of Fractional Delay Iir Filtermentioning

confidence: 99%

Novel Fractional-Order Repetitive Controller Based on Thiran IIR Filter for Grid-Connected Inverters

et al. 2022

View full text Add to dashboard Cite

The proportional-integral multi-resonance repetitive controller (PIMR-RC) can track the reference current signal of the grid-connected inverter without static error, suppress low-frequency harmonic disturbance signals, and have a fast dynamic response. However, when the grid frequency fluctuates, the performance of reference signal tracking and harmonic suppression will decrease. Based on PIMR-RC, this paper proposes a novel fractional-order repetitive controller (NFO-RC) based on the Thiran infinite impulse response (Thiran IIR) filter, which can automatically track the change of grid frequency. Firstly, the frequency domain analysis of PIMR-RC is given. Then, the realization method based on the Thiran IIR filter is designed, and the structure of NFO-RC system is presented. Moreover, the stability and harmonic suppression analysis of NFO-RC system based on Thiran IIR filter are given. Finally, experimental results on a single-phase LCL grid-connected inverter verify excellent harmonic suppression performance of the proposed NFO-RC system under grid frequency fluctuations.

show abstract

“…In VSC control strategies, methods such as increasing the bandwidth of injected current and incorporating specific harmonic compensators (HC) are employed to further reduce harmonic content. PR controllers and HC have been utilized to mitigate steady‐state errors at selected frequencies and compensate for background voltage harmonics 9 . To prevent instability caused by these controllers, the current control loop should maintain a sufficiently high bandwidth to encompass the resonant frequency of these controllers 28 .…”

Section: Introductionmentioning

confidence: 99%

Active disturbance rejection controller design for harmonic suppression in MPC optimal control based on harmonic state space modeling

Jican

Liu

Wang

2023

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryThis paper proposes a harmonic suppression strategy for photovoltaic‐voltage source converters (PV‐VSC). The proposed method utilizes a harmonic state space (HSS) model‐combine model predictive control (MPC) algorithm, which provides a comprehensive representation of the global characteristics of AC/DC harmonic coupling impedance in photovoltaic systems. The HSS‐based converter model operates as a linear time‐varying periodic system, which allows for the implementation of MPC to optimize the HSS equation. This optimization yields voltage increments across various harmonic orders, providing feedforward compensation for the current controller. By incorporating feedback signals into the current control, harmonic compensation is achieved, resulting in improved power quality. Furthermore, a decoupled proportional resonance‐linear adaptive disturbance rejection control (PR‐LADRC) is employed to effectively mitigate steady‐state errors and decrease total harmonic distortion in the presence of DC‐side disturbances. This is accomplished by decoupling the disturbance observer from the controller and integrating the increment feedback signal derived from the MPC‐HSS. Finally, the efficacy of the proposed method and the analysis results are corroborated through numerical simulations.

show abstract

Frequency Adaptive Proportional-Repetitive Control for Grid-Connected Inverters

Cited by 49 publications

References 33 publications

An Adaptive Hybrid Control of Reduced Switch Multilevel Grid Connected Inverter for Weak Grid Applications

An Adaptive Hybrid Control of Reduced Switch Multilevel Grid Connected Inverter for Weak Grid Applications

Novel Fractional-Order Repetitive Controller Based on Thiran IIR Filter for Grid-Connected Inverters

Active disturbance rejection controller design for harmonic suppression in MPC optimal control based on harmonic state space modeling

Contact Info

Product

Resources

About