Advanced compensation mode for cascade multilevel static synchronous compensator under unbalanced voltage

Zang, Chunyan; Liu, Zhao

doi:10.1049/iet-pel.2014.0029

Cited by 18 publications

(9 citation statements)

References 18 publications

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“…A pre-charge circuit is formed by R, J 1 and J 2 , L 1 is used to reduce the second harmonic current. By the methods proposed in [21] and [22], all chains with batteries and all chains with capacitors can respectively be assumed to the same.…”

Section: Equivalent Model Of Systemmentioning

confidence: 99%

A Power Distribution Control Strategy Between Energy Storage Elements and Capacitors for Cascaded Multilevel Inverter With Hybrid Energy Sources

et al. 2019

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The key technology of a cascaded multilevel inverter with hybrid energy sources lies in the power distribution among different chains. A power distribution control strategy between the energy storage elements and the capacitors is proposed to achieve fault tolerant control. In the cascaded multilevel inverter with hybrid energy sources, the chains with energy storage elements can operate in four quadrants, while the chains with capacitors can only operate in two quadrants. With the proposed control method, the active power distribution is realized by active voltage vector superposition, and the reactive power distribution is achieved by initial operation point selection. This enhances both the system reliability and availability while enabling continuous operation in four quadrants. Meanwhile, the stable operation region and the range of the initial operating point have been derived by the vector analysis to avoid over-modulation. An experimental prototype based on a single-phase link with two series chains has been built in the laboratory. The simulation and experimental results are provided to demonstrate the effectiveness of the proposed control method. INDEX TERMS DC-AC power converters, power control, voltage control, energy conversion, energy exchange, energy storage, power generation control.

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Section: Equivalent Model Of Systemmentioning

confidence: 99%

A Power Distribution Control Strategy Between Energy Storage Elements and Capacitors for Cascaded Multilevel Inverter With Hybrid Energy Sources

et al. 2019

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“…It should be noted that the boundaries must satisfy equation (3). The next step is to randomly generate an initial population of switching angles in this process the algorithm creates…”

Section: Topologymentioning

confidence: 99%

“…The usage of power converters in high power applications have led to the development of various families and architectures such as Neutral Point Clamped (NPC) [1] Diode-clamped [2], and cascade multilevel inverters (CMLIs) [3].…”

Section: Introductionmentioning

confidence: 99%

Differential Evolution based SHEPWM for Seven-Level Inverter with Non-Equal DC Sources

Chabni¹,

Taleb²,

Helaimi³

2016

ijacsa

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Abstract-This paper presents the application of differential evolution algorithm to obtain optimal switching angles for a single-phase seven-level to improve AC voltage quality. The proposed inverter in this article is composed of two H-bridge cells with non-equal DC voltage sources in order to generate multiple voltage levels. Selective harmonic elimination pulse width modulation (SHPWM) strategy is used to improve the AC output voltage waveform generated by the proposed inverter. The differential evolution (DE) optimization algorithm is used to solve non-linear transcendental equations necessary for the (SHPWM). Computational results obtained from computer simulations presented a good agreement with the theoretical predictions. A laboratory prototype based on STM32F407 microcontroller was built in order to validate the simulation results. The experimental results show the effectiveness of the proposed modulation method.

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“…This category includes static VAR compensators (SVCs) and static synchronous compensators (STATCOMs), which are widely used for voltage balancing. Both devices provide a satisfactory performance in mitigating the unbalanced voltage . However, the SVCs are more cost efficient for the same ratings of volt‐ampere (VA) .…”

Section: Introductionmentioning

confidence: 99%

“…Both devices provide a satisfactory performance in mitigating the unbalanced voltage. [18][19][20][21][22] However, the SVCs are more cost efficient for the same ratings of volt-ampere (VA). 23 Furthermore, the effectiveness of SVC can be increased by using a suitable control algorithm.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the response of thyristor‐controlled reactor using neural network

Ragab

Ghaeb

Al‐Naimi

2019

Int Trans Electr Energ Syst

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Summary In this paper, a neural network controller is proposed to retrieve the voltage balancing conditions in three‐phase power systems. The neural network is suggested to calculate the required set of firing angles for the thyristor‐controlled reactor accurately to balance the three‐load voltages quickly. The proposed controller is fed by different parameters within different feeding techniques, namely, root mean square (RMS) values of the three load voltages, RMS value of the space vector signal calculated from the three load voltages, and the RMS values of both the three load voltages and their associated space vector. The intentions of the proposed techniques are to combine between reducing the number of measured parameters and providing the controller with qualitative data about system status. The influence of the measured parameters on the neural network performance is examined by calculating the regression coefficients through several test cases. Accordingly, only the effective parameters are utilized to reduce the neural network complexity and to enhance the controller response time. Additionally, the calculations of the controller input parameters are made in terms of space vector cycle, which is half of system sinusoidal cycle. Consequently, the calculation time is reduced significantly. The Aqaba‐Qatrana‐South Amman power system is considered and modeled as a real case study. In addition, several test cases have been conducted to test and validate the ability of the proposed neural network controller in retrieving the voltage balance conditions precisely and quickly. The results have revealed the ability of the proposed neural network controller to calculate the firing angles quickly within 10 milliseconds and achieve very low voltage unbalance factor.

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Advanced compensation mode for cascade multilevel static synchronous compensator under unbalanced voltage

Cited by 18 publications

References 18 publications

A Power Distribution Control Strategy Between Energy Storage Elements and Capacitors for Cascaded Multilevel Inverter With Hybrid Energy Sources

A Power Distribution Control Strategy Between Energy Storage Elements and Capacitors for Cascaded Multilevel Inverter With Hybrid Energy Sources

Differential Evolution based SHEPWM for Seven-Level Inverter with Non-Equal DC Sources

Enhancing the response of thyristor‐controlled reactor using neural network

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