PI State Space Current Control of Grid-Connected PWM Converters With LCL Filters

Dannehl, J.; Fuchs, Friedrich W.; Thøgersen, Paul

doi:10.1109/tpel.2010.2047408

Cited by 271 publications

(133 citation statements)

References 28 publications

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“…In total, there are 18 kinds of state feedback as shown in (6) where P, I and D stand for proportional, integral and derivative feedback, respectively. The number of states participating in the pole-placement can be 2, 3 or 4 [42][43][44][45][46][47][48][49].…”

Section: Pole-placement Strategymentioning

confidence: 99%

“…It should be noted that conventional full state feedback control in [44] and the slide mode control in [50] are the typical implementation of (6) with the use of proportional feedback of i L1 , i L2 and u C1 . This kind of multi-state feedback control requires sampling several current and voltage signals.…”

Section: Multi-state Feedback Control Based On Poleplacementmentioning

confidence: 99%

“…For the pole-placement design in the z-domain, another way is to take account the control delay by introducing an extra state. For instance, considering that the control delay appears as z -1 , the inverter output voltage was included in the state vector [44][45][46][47][48], and several parameter design methods for full state feedback control were proposed in [45,46,48]. Table 3 gives a general overview of the existing multistate feedback strategies.…”

Section: Multi-state Feedback Control Based On Poleplacementmentioning

confidence: 99%

“…Pole-placement based multi-state feedback is robust because of the full controllability of the inverter dynamics, as analyzed in [44,46,50]. However, for zero-placement based multi-state feedback, the weights f 1 (s) and f 2-(s) closely relate to the filter parameters.…”

Section: Multi-state Feedback Admentioning

confidence: 99%

“…Filter-based AD improves stability by adding a digital filter next to the current controller [11][12][13][14][15][16]. For feedbackbased AD, the state used for feedback can be the capacitor current [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], the capacitor voltage [33][34][35][36], the inverterside current [37], the grid current [38][39][40][41] or a combination of multiple states [42][43][44][45][46][47][48][49][50]. Among the feedback-based AD methods, proportional feedback of capacitor current is widely studied during last decade due to its simple implementation.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Singlestate feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the poleplacement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

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Section: Pole-placement Strategymentioning

confidence: 99%

Section: Multi-state Feedback Control Based On Poleplacementmentioning

confidence: 99%

Section: Multi-state Feedback Control Based On Poleplacementmentioning

confidence: 99%

Section: Multi-state Feedback Admentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid Filter Design

Teodorescu

Liserre

Rodríguez

2010

Grid Converters for Photovoltaic and Wind Power Systems

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The role of the grid filters in VSC-based grid converter operation is twofold. On one side the grid filter should have a dominant inductive behaviour to guarantee the proper operation of the voltage source converter if connected to a voltage source type system such as the utility grid. In this sense grid converters replicate the well-known behaviour of synchronous generators and of transmission lines where the control of active and reactive power exchange is related to the control of phase and magnitude of the electromagnetic force. On the other side, VSCbased grid converters generate PWM carrier and side-band voltage harmonics. These voltages may lead to current flowing into the grid, which can disturb other sensitive loads/equipment and increase losses if proper grid filters are not adopted to prevent them flowing. A grid filter made by a simple inductor is the simplest solution to comply with the two aforementioned requirements.For applications around and above several hundreds of kW, like the wind turbine systems, the switching frequency is low, to limit losses. Hence to attenuate the harmonics in the current enough to meet the demands of standards and grid codes the use of a high value of input inductance could be not enough alone (Figure 11.1) and it becomes quite expensive to realize higher value filter reactors and sometimes also the encumbrance of the inductor could be an issue [1]. Moreover, the system dynamic response may become poorer.For applications around a few kW, like the most widespread photovoltaic systems, the switching frequency is higher. Hence even smaller inductors could help in meeting the requirements, but the encumbrance of the inductors is certainly an issue since the converter and its passive elements are integrated.At a system level, like in the case of wind or photovoltaic parks, the main concern is related to the disturbances produced by some specific harmonics. Hence a possibility is to use a bank of tuned LC trap filters, which have the advantage to stop specific harmonics that could deteriorate the voltage quality.However, typically standards and grid codes recommend compliance with limitations that are very stringent for frequencies above a certain threshold. Hence a low-pass filter attenuation is needed and the preferred solution becomes the use of high-order filters like LCL, which provide 60 dB per decade attenuation for the PWM carrier and side-band voltage harmonics. Figure 11.1 Worst-case weighted harmonic voltage over the modulation index range (0.8-1.15) compared to the German VDEW per-unit harmonic current injection limits (base voltage 3.3 kV, base power 6 MVA, SCR = 20, 1.05 kHz, 1 p.u. inductor) With this solution, optimum results can be obtained using quite small values of inductors and capacitors [2, 3].A further issue for a VSC is high-frequency EMI (differential mode and common mode) [4], which needs specific filters in frequency ranges above 150 kHz and rated at lower power levels.Of course an LCL filter that is effective in the reduction of switching frequency...

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General Unified Dynamic Phasor

Rim¹,

2017

Wireless Power Transfer for Electric Vehicles and Mobile Devices

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PI State Space Current Control of Grid-Connected PWM Converters With LCL Filters

Cited by 271 publications

References 28 publications

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Grid Filter Design

General Unified Dynamic Phasor

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