Low-Frequency Input Current Ripple Reduction Based on Load Current Feedforward in a Two-Stage Single-Phase Inverter

Shi, Yao; Liu, Bangyin; Duan, Shanxu

doi:10.1109/tpel.2015.2513065

Cited by 82 publications

(41 citation statements)

References 33 publications

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“…It can be seen clearly that u dc contains a DC component and a ripple at 100 Hz. The ripple at 100 Hz is due to pulsating output power of the single-phase inverter [30]. In Figure 5c, the waveform of u dc is non-sinusoidal.…”

Section: Stability Analysismentioning

confidence: 99%

Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System

et al. 2017

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Abstract:The stability issue of a single-phase two-stage grid-connected photovoltaic system is complicated due to the nonlinear v-i characteristic of the photovoltaic array as well as the interaction between power converters. Besides, even though linear system theory is widely used in stability analysis of balanced three-phase systems, the application of the same theory to single-phase systems meets serious challenges, since single-phase systems cannot be transformed into linear time-invariant systems simply using Park transformation as balanced three-phase systems. In this paper, (1) the integrated mathematical model of a single-phase two-stage grid-connected photovoltaic system is established, in which both DC-DC converter and DC-AC converter are included also the characteristic of the PV array is considered; (2) an observer-pattern modeling method is used to eliminate the time-varying variables; and (3) the stability of the system is studied using eigenvalue sensitivity and eigenvalue loci plots. Finally, simulation results are given to validate the proposed model and stability analysis.

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Section: Stability Analysismentioning

confidence: 99%

Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System

et al. 2017

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“…Now, by using the switching functions from equation 6 and equation 7, the inverter current through the switches S1 and S3 can be approximated as: 13 shows that the single-phase inverter current has a second order harmonic current (2ω component ) in addit ion t o a DC component . T his second harmonic current flows t hrough t he boost output side to its input and appears in an amplified form.…”

Section: Origin Of Second Harmonic Componentmentioning

confidence: 99%

“…In other words, the DC-bus capacitor is made to supply the 120 Hz harmonic component, leaving the input current ripple free. [13] introduced a High Pass filter to compensate for the DC bias produced due to load current feed forward control by a continuous integral action of the DC-bus impedance function. However, the design proposed by this paper prevents the production of a dc bias voltage, thereby eliminating the need to add a high pass filter and reducing the complexity further.…”

Section: Conventional Control Systemmentioning

confidence: 99%

“…Another alternative way to eliminate the ripple is to adopt a control strategy such that the DC-bus capacitor supplies the entirety of the second harmonic current, leading the input current ripple to approach zero. [13] proposes a load current feed-forward (LCFF) control mechanism to modify the bus capacitance to supply the inverter input current. However, the control scheme is suggested for Buck Converter.…”

Section: Introductionmentioning

confidence: 99%

“…Fuel cells also find use in residential and business applications such as HVAC heating, ventilation, and air-conditioning systems. [13] also suggests that the presence of an input inductor in a DC-DC Boost Converter can smoothen the input current by filtering out the ripple to some extent. But, the design of the inductor while keeping the system cost at a minimum, becomes challenging.…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of Input Ripple Current in Single Phase Fuel Cell Power Systems

Sinha¹,

Shireen²,

Pramanick³

2017

IJPER

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Abstract. Fuel cells serve as clean, renewable and an efficient source of electrical energy. The power conditioning system associated with their applications consists of a DC-DC Converter stage and a DC-AC inverter stage. In a single-phase fuel cell system, the single-phase inverter introduces a second harmonic component in the current drawn from the fuel cell source. This low-frequency current ripple has been found to be detrimental to the performance, lifespan, and efficiency of the fuel cell, if not adequately controlled. The paper presents a single loop current control method for the DC-DC converter stage that reduces the input current ripple drawn from the source in the single-phase fuel cell system. Simulations are carried out using MATLAB; the results compared with the conventional method. To validate the proposed approach, experimental results from a laboratory prototype are presented. The proposed method uses a Digital Signal Processor for control system monitoring and control.Keywords: Fuel cell, second harmonic current ripple, DC-DC boost converter, power electronics, single phase inverter. IntroductionWith the increase in demand for electrical power generation, there has been an increase in the usage of fossil fuels. The depletion of these non-renewable sources of energy has necessitated the use of renewable energy sources, like wind energy, solar energy, fuel cells, tidal energy-to name a few. Fuel cells are one of the cleanest sources of energy and are being used for transportation, stationary and portable power applications. Since these are single-phase applications, the power conditioning system associated with the fuel cell stack is a DC-DC converter connected to a DC-AC Single Phase Inverter. The DC-AC stage introduces a second harmonic ripple current which gets imposed on the fuel cell. This low order current ripple reduces the lifetime of fuel cells, deteriorates their performance and hence, decreases the overall efficiency. It can reduce the fuel cell output power by 6% due to internal losses, and cause an increase in the distortion of its an LC series resonance circuit tuned to twice the output frequency connected in parallel to the DC bus capacitor in a pulse width modulated voltage source inverter. Similar methods of using an active filter for current ripple reduction were proposed in [9] and [10]. Although the methods mentioned above can reduce the low order ripple current efficiently, yet the addition of an external circuit, large capacitor or high-power switches may result in an increase in cost, power losses and system complexity. The reliability of the system is also affected.[11] suggests a waveform control scheme to mitigate the lowfrequency current ripple.[12] puts forward a model predictive control strategy for second order harmonic reduction which tries modifying the duty cycle to minimize the second harmonic current. Another alternative way to eliminate the ripple is to adopt a control strategy such that the DC-bus capacitor supplies the entirety of the second harmonic current,...

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Single‐stage buck‐boost off‐grid inverter with feedforward control

Yao

Liang

2023

Circuit Theory & Apps

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Summary Since the output voltage accuracy of the off‐grid inverter is low with the proportional‐integral (PI) control and a two‐stage inverter is often used in the low input voltage application, a single‐stage buck‐boost off‐grid inverter with feedforward control is proposed. The proposed inverter consists of a buck‐boost converter and a full‐bridge inverter. The buck‐boost converter operates at high frequency, while the full‐bridge inverter operates at line frequency. Therefore, the intermediate bus voltage is controlled as the unipolar half‐cycle sinusoidal voltage wave to reduce the voltage stress of semiconductors, and film capacitors can be used as intermediate bus capacitors for high reliability and high power density. The operating principle is illustrated. Design guidelines and example are given. The stability analysis and external characteristic analysis are given. A 500‐W proposed inverter is constructed to verify the theoretical analysis.

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Low-Frequency Input Current Ripple Reduction Based on Load Current Feedforward in a Two-Stage Single-Phase Inverter

Cited by 82 publications

References 33 publications

Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System

Modeling and Stability Analysis of a Single-Phase Two-Stage Grid-Connected Photovoltaic System

Mitigation of Input Ripple Current in Single Phase Fuel Cell Power Systems

Single‐stage buck‐boost off‐grid inverter with feedforward control

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