Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Zheng, Shicheng; Li, Zhuangzhuang; Cao, Menglin

doi:10.23919/cjee.2019.000003

Cited by 12 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…References [6,7] proposed setting up a converter in the electric phase separation area so that the neutral section voltage can be flexibly transitioned between the two supply arms to realize the train's uninterrupted phase-separation passing. Reference [8] changed the neutral line voltage phase by means of a railway power regulator (RPC) and a phase-shifting transformer in series so that the train can have uninterrupted phase-separation passing. In Reference [9], a single-phase inverter is connected in series with a phase-shifting transformer through the middle DC side of the railway power regulator to eliminate the dead zone of the power supply in the electrical phase-separation link.…”

Section: Introductionmentioning

confidence: 99%

Train based on virtual synchronous generator technology uninterrupted phase-separation passing study

2024

Archives of Electrical Engineering

View full text Add to dashboard Cite

The problem of large speed loss exists in the traditional passing through the electric phase-separation method of trains, which is more prominent when trains pass through an electric phase-separation zone in the uphill section of long ramps and may lead to the trains not passing through the phase-separation zone safely. In order to solve this problem, based on the energy storage type railroad power conditioner, a train uninterrupted phase-separation passing system based on the energy storage type railroad power conditioner is proposed. The energy storage railroad power conditioner can realize the recovery and utilization of regenerative braking energy of the electrified railroad. In the structure of the energy storage railroad power conditioner, the single-phase inverter is led from the middle DC side of the energy storage railroad power conditioner and connected to the neutral line through the LCL filter and the step-up transformer, which constitutes an uninterrupted phaseseparation passing system. The single-phase inverter is controlled using virtual synchronous generator technology, which allows the single-phase inverter to have external characteristics similar to those of a synchronous generator, providing support for the voltage and frequency in the neutral zone. The power required by the train to pass the electric phase-separation is provided by the power supply arm or the energy storage system, which not only improves the utilization rate of regenerative braking energy but also realizes the uninterrupted phaseseparation passing of the train through the control of the voltage in the neutral region.

show abstract

Section: Introductionmentioning

confidence: 99%

Train based on virtual synchronous generator technology uninterrupted phase-separation passing study

2024

Archives of Electrical Engineering

View full text Add to dashboard Cite

show abstract

“…If the rotor current exceeds the set value during a fault, the crowbar circuit is used to shortcircuit the rotor winding and converter. [4][5] Consuming power on the current limiting resistor to reduce the fault current on the rotor side by selecting a suitable current limiting resistor with a suitable resistance value, the voltage borne by the converter switch tube is kept within a safe range. At the same time, the pitch angle is adjusted to reduce the fan speed to prevent overspeed shutdown, so that all parts of the doubly fed fan are not damaged during the fault period and maintain grid connection operation until the fault is removed or the time required for low-voltage crossing is reached before grid disconnection.…”

Section: Introductionmentioning

confidence: 99%

Adaptability Analysis of Differential Protection for Output Transformers in Wind Power Plants

Yang,

Li,

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

After large-scale integration of wind farms into the power grid, according to the requirements of the State Grid’s wind power grid connection operation guidelines, wind farms should have low-voltage ride-through capability. The short-circuit current of wind farms will have a significant impact on the identification of excitation inrush currents in the transformers sent out by the wind farms, and the saturation of current transformers will also have an impact on differential protection. Analysis shows that after the wind power is connected, the harmonic components contained in the fault current output by the wind farm will cause the second harmonic braking component to malfunction, and there is a risk of transformer differential protection rejecting operation. At the same time, it will make the current transformer more susceptible to saturation, and the saturation of TA will increase the differential current of the transformer, which may cause misoperation of the transformer differential protection.

show abstract

“…Such a problem can be mitigated using large-scale grid power. In addition to frequency regulation via active power (P), reactive power manipulation is performed to regulate the grid voltage [19] for the grid integration of RESs with low voltage ride through capability [20] . To alleviate the aforementioned problems, an inverter that mimics the inertial response of an SM must be used to integrate a solar power system with a power grid [21] .…”

Section: Introductionmentioning

confidence: 99%

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Yap

Beh

Sarimuthu

2021

Chin. J. Electr. Eng.

View full text Add to dashboard Cite

In recent years, renewable energy sources, specifically solar power systems, have developed rapidly owing to their technological maturity and cost effectiveness. However, its grid integration deteriorates frequency stability because of insufficient rotating masses and inertial response. Hence, a synchronverter, which is an inverter that mimics the operation of a synchronous generator, is crucial to interface solar power in a power grid. It stabilizes the power grid by emulating a virtual inertia. However, a conventional proportional-integral (PI)-based synchronverter is not equipped with an adaptive damping factor (D p ) or a digitalized smart controller to manage fast-responding solar inputs. Hence, a novel fuzzy logic controller (FLC) framework is proposed such that the synchronverter can operate in a grid-connected solar power system. In this study, D p is controlled in real time using an FLC to achieve balance between speed and stability for frequency error correction based on frequency difference. Results of four case studies performed in Matlab/Simulink show that the proposed FLC-based synchronverter can stabilize the grid frequency by reducing the frequency deviation by at least 0.2 Hz (0.4%), as compared with the conventional PI-based synchronverter.

show abstract

Direct current control strategy of SVG based on dual sequence dq coordinates under asymmetric load condition

Cited by 12 publications

References 16 publications

Train based on virtual synchronous generator technology uninterrupted phase-separation passing study

Train based on virtual synchronous generator technology uninterrupted phase-separation passing study

Adaptability Analysis of Differential Protection for Output Transformers in Wind Power Plants

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Contact Info

Product

Resources

About