[논문]A Novel Filter Design for Output LC Filters of PWM Inverters

Kim, Hyo-Sung; Sul, Seung-Ki

doi:10.6113/jpe.2011.11.1.074

A Novel Filter Design for Output LC Filters of PWM Inverters 원문보기

Journal of power electronics, v.11 no.1, 2011년, pp.74 - 81

Kim, Hyo-Sung (School of EE & Control Eng., Kongju National University) , Sul, Seung-Ki (School of Electrical Eng., Seoul National University)

Abstract ▼ AI-Helper

The cutoff frequency of the output LC filters of PWM inverters limits the control bandwidth of the converter system while it attenuates voltage ripples that are caused by inverter switching activities. For a selected cutoff frequency of an output LC filter, an infinite number of L-C combinations is possible. This paper analyses the characteristics of output LC filters for PWM inverters terms of the L-C combinations. Practical circuit conditions such as no-loads, full resistive-loads, and inductive-load conditions are considered in the analysis. This paper proposes a LC filter design method for PWM inverters considering both the voltage ynamics and he inverter stack size. An experimental PWM inverter system based on the proposed output LC lter design uideline is built and tested.

주제어

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문제 정의

Because major problems generally occur in a very short time, this paper focuses on transient state analyses of the inverter system.

제안 방법

Practical circuit conditions such as the no-load, full resistiveload, and inductive-load conditions are considered in the analysis. Based on the analysis, a novel filter design method that guarantees good control dynamics and that minimizes the transient current overshoot is proposed. The proposed design method is verified in an experimental setup.
This paper analyses the characteristics of output LC filters for PWM inverters while considering the L-C combinations. Practical circuit conditions such as the no-load, full resistiveload, and inductive-load conditions are considered in the analysis.
This paper analyzed the characteristics of LC filters as they relate to the filter capacitor voltage and the filter inductor current of PWM inverters in a transient state. When PWM inverters are required to generate a sudden output voltage in a step-wise manner, inverter switches should supply a very large amount of charging current into the filter capacitor, which increases the inverter stack size.
When PWM inverters are required to generate a sudden output voltage in a step-wise manner, inverter switches should supply a very large amount of charging current into the filter capacitor, which increases the inverter stack size. This paper proposed a novel filter design method for the output LC filters of PWM inverters which does not generate unnecessarily high current stress in the inverter switches nor degrade the control performance of the inverter system.
This paper proposes LC filter design methods that minimize the transient current overshoot problem without decreasing the active damping performance of inverter systems.
Conventionally, this type of transient current problem was solved via the over-sizing of the inverter switches, which increases the cost. This paper proposes a design guideline for LC output filters that does not generate the transient current overshoot problem without increasing the size of the inverter switches.

대상 데이터

8 shows the experimental setup that verifies the proposed design method for the output LC filter. The experiment was performed on a single-phase inverter module. The experimental conditions are shown in Table I.
A sinusoidal reference load voltage was applied when its magnitude was at the maximum value of 120V. The inverter was composed of 4 IGBT switches with a switching frequency of 10 kHz. The sampling time of the digital control system is 10 kHz.

이론/모형

9. The proposed theory can be applied to the entire range of the system-dam ping factor. However, because the normal control target of the system-damping factor on the capacitor voltage is usually around 0.

성능/효과

Together with the deadbeat controller, a neural network-based estimation unit was proposed with low computational demand to estimate the interfacing parameters and the grid voltage vector simultaneously in real time [23]. The proposed control algorithm was stable and generated minimal low-order harmonics even with a 60% mismatch in the filter inductance. Resonant filters have been invented that are capable of sensing major low-order harmonics across the filter capacitor voltage.

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