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Power flow control system

A power flow control and controller technology, applied in AC network circuits and AC networks to reduce harmonics/ripples, climate change adaptation, etc. Phase unbalance, increased flexibility, overall cost reduction effect

Inactive Publication Date: 2012-05-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the entire UPFC device has a large capacity and complex structure, resulting in a long design and manufacturing cycle, long maintenance time, a large footprint, and a large centralized impact on the surrounding environment.
In addition, due to the use of high-voltage converters, corresponding protection devices are required, making the overall cost of UPFC relatively expensive, which limits its application, and its complex structure also makes it prone to failure

Method used

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Examples

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Embodiment Construction

[0028] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] see figure 1 , a power flow control system, including a parallel-side converter, a series-side converter, a first Y-Δ transformer T1, a second Y-Δ transformer T2, the parallel-side converter is located between the grid and the first Y-Δ transformer Between T1, the series-side converter is located between the first Y-Δ transformer T1 and the second Y-Δ transformer T2; the parallel-side converter includes a back-to-back three-phase converter VSC1 and a single-phase converter The three-phase converter VSC2 is formed by DC capacitor coupling. The three-phase converter VSC1 is connected to the transmission line between the grid and the first Y-Δ transformer T1 through a transformer. The single-phase converter VSC2 converts the fundamental wave in the grid into The third harmonic, and through the neutral point of the Y-shaped winding of the first Y-Δ t...

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Abstract

The invention relates to a power flow control system. In the system, active power is transmitted between a parallel-side converter and a series-side converter of a device by virtue of third harmonic so that the series-side converter can adjust active power distribution on a power transmission line. The power flow control system effectively improves the topological structure and the power exchange mode of the existing UPFC (Unified Power Flow Controller) device so as to save the total cost of the device and improve the operating reliability and control flexibility of the whole device.

Description

technical field [0001] The invention relates to a power cable control system, in particular to a power cable power flow control system. Background technique [0002] With the development of distributed generation (DG, distributed generation) technology, more and more small and medium-sized DGs are connected to the distribution network side of the power system. The flow of transmission is reversed, based on the climate variability of DG based on renewable energy, the system needs power control to compensate for the intermittency of DG; the continuous growth of user load requires flow control means to improve the power transmission capacity of existing lines; tie lines The existence of power blockage between power grids, the existence of circulating power causing huge line losses, and the bidirectional power flow between tie lines require appropriate power flow control; the complex power exchange between the booming smart grid and power market requires frequent power flow cont...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/26H02J3/01H02J3/38
CPCY02E40/50Y02A30/60Y02E40/40
Inventor 唐爱红袁玮张晓成刘芙蓉王少荣
Owner WUHAN UNIV OF TECH
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