This monitoring scheme consists of various stages: (1) first-start calibration of the capacitor; (2) estimation of the capacitor''s current; (3) estimation of the capacitor''s core temperature; (4) estimation of the capacitor''s degradation; (5) estimation of capacitor''s bank parameters; and (6) capacitor model updating. The initial calibration ...
Capacitor condition monitoring methods Sensor-based methods use direct sensors to measure the voltage and current information to obtain the capacitance and ESR [ 5 ]. In addition, external signals may be injected at a specific frequency to get the voltage and current information.
When one or several capacitor banks are utilized, monitoring methods using the capacitor's current sensor to estimate the health of individual capacitors cannot be employed due to the increase in the required current sensors, which leads to an increase in weight, volume, and cost of the system.
In the test system, the capacitor voltage and arm current waveforms within 1 s are extracted. The voltage and current waveforms in one cycle are randomly selected to calculate the capacitance. As shown in Fig. 7, when the sampling points are 22, 82, 116, and 357, the SM is inserted into the system, and the capacitor voltage rises.
Therefore, it can be detected by ordinary voltage sensors and processing devices. The state observer is used to estimate the voltage of the capacitor. The ESR and C are obtained and adjusted them according to the difference between the estimated voltage and the actual voltage value.
In the future, it is expected that the use of data-based methods will become increasingly prevalent in the field of condition monitoring for capacitors used in power converters. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
A state observer method for monitoring the state of capacitors is proposed in . A 100 Hz square wave which is a low frequency signal, is used to avoid the additional hardware. The input voltage signal causes large fluctuations in the capacitor voltage. Therefore, it can be detected by ordinary voltage sensors and processing devices.
This monitoring scheme consists of various stages: (1) first-start calibration of the capacitor; (2) estimation of the capacitor''s current; (3) estimation of the capacitor''s core temperature; (4) estimation of the capacitor''s degradation; (5) estimation of capacitor''s bank parameters; and (6) capacitor model updating. The initial calibration ...
Get Pricetive capacitor monitoring method to estimate the capacitance is essential for the MMC, from which a predictive maintenance is possible, leading to the better reliability of the MMC.
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Get PriceAbstract: This letter proposes a novel capacitor condition monitoring method for modular multilevel converters (MMCs) based on reference submodules (SMs). It significantly enhances the capacitor monitoring accuracy by making full use of the SM voltage sensor measurement range.
Get PriceIt monitors capacitors by actively adjusting the neutral-point (NP) current to induce a ripple in the NP voltage. Then, it reconstructs the injected NP current based on the switching states and three-phase currents, and obtains the response ripple in the NP voltage through a recursive least square (RLS) filter. Finally, according to ...
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Get PricePSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Experimental Setup • Three-phase inverter with replaceable dc-link capacitors. • EMI current measured via high-bandwidth current sensor. Modular Three Phase Inverter. Current Sensor and Inverter. Parameter Value Unit Switching frequency 20 kHz Fundamental ...
Get PriceThis letter proposes a novel capacitor condition monitoring method for modular multilevel converters (MMCs) based on reference submodules (SMs). It significantly enhances the capacitor monitoring accuracy by making full use of the SM voltage sensor measurement range. Accuracy comparison between the existing method and the proposed method is conducted to …
Get PricePSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Experimental Setup • Three-phase inverter with replaceable dc-link capacitors. • EMI current …
Get PriceIt monitors capacitors by actively adjusting the neutral-point (NP) current to induce a ripple in the NP voltage. Then, it reconstructs the injected NP current based on the …
Get PriceThis paper introduced a capacitor monitoring method based on submodule (SM) insertion windows to enhance the reliability of the MMC. Firstly, the voltage difference between the reference SM and other SMs is monitored to assess the capacitor condition of the SMs. Secondly, for the selected SM capacitors in abnormal state, an insertion ...
Get PriceTherefore, this paper has presented the study of capacitor condition monitoring and proposed an artificial neural network (ANN) based capacitance condition monitoring system for estimating the capacitance. The training data required for ANN is obtained through an experimental setup.
Get PriceCondition monitoring methods can be applied to assess the health status of capacitors and realize predictive maintenance to improve reliability. Current research works for condition monitoring of capacitors in an MMC mainly monitor either capacitance or equivalent series resistance (ESR), while these two health indicators can shift ...
Get PriceCapacitor condition monitoring technologies can be classified based on the indicators used to assess the health of the capacitor and the methods used to obtain the …
Get PriceCondition monitoring methods can be applied to assess the health status of capacitors and realize predictive maintenance to improve reliability. Current research works for …
Get PriceThis paper presented an online monitoring method for the SM capacitors in MMC systems. The start time and end time of the SM capacitor charging and discharging can …
Get PriceCapacitor condition monitoring technologies can be classified based on the indicators used to assess the health of the capacitor and the methods used to obtain the values of those indicators. Specifically, the methods used to obtain specific electrical parameters can be divided into three categories, which are discussed in the ...
Get PriceThis article proposes a capacitor condition monitoring (CM) method for modular multilevel converter (MMC) in motor drive applications. The proposed method is based on wavelet decomposition of transient voltage signals, which is independent of modulation schemes and control strategies. The equivalent series resistance (ESR) change can be detected with a …
Get PriceThis paper introduced a capacitor monitoring method based on submodule (SM) insertion windows to enhance the reliability of the MMC. Firstly, the voltage difference …
Get PriceThis paper proposes a suitable grey-box method for online monitoring of dc-link capacitors. It is found that the transient behavior of dc-link voltage in ac/dc and dc/dc converters is similar to ...
Get PriceThis paper presents methods for voltage balancing of capacitors, capacitance monitoring and open-circuit fault detection in nested neutral point-clamped (NNPC) converter with a reduced number of voltage and current sensors. In the proposed method, converter capacitors'' voltage and current sensors are eliminated, and only the output sensors are ...
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Get PriceA Data-Driven Condition Monitoring Method for Capacitor in Modular Multilevel Converter (MMC) Shuyu Ou∗, Mahyar Hassanifar †, Martin Votava‡, Marius Langwasser, Marco Liserre†‡, Ariya Sangwongwanich ∗, Subham Sahoo, and Frede Blaabjerg ∗Department of Energy, Aalborg University, Aalborg, Denmark †Chair of Power Electronics, Kiel University, Kiel, Germany
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Get PriceAbstract: This letter proposes a novel capacitor condition monitoring method for modular multilevel converters (MMCs) based on reference submodules (SMs). It …
Get PriceCapacitor monitoring is one of the effective measures to assess the health status of power converters. Although some conventional methods have been proposed, they require adding auxiliary current sensors, changing operation conditions, or deteriorating the output performance. The lack of noninvasive online capacitor monitoring methods is a great problem in an ac/dc/ac …
Get PriceThis paper presented an online monitoring method for the SM capacitors in MMC systems. The start time and end time of the SM capacitor charging and discharging can be determined by the cumulative sum algorithm of the sliding window algorithm, and the capacitance can be calculated according to the measured SM voltage and arm current ...
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