Flexible multi-state switch and control method thereof

A control method and multi-state technology, applied to AC network circuits, electrical components, and AC networks with the same frequency from different sources, etc., can solve the problems of AC system frequency instability, limited number of switches, discrete adjustments, etc., to achieve control The method is flexible and diverse, the control is continuous, and the effect of avoiding power supply interruption

Active Publication Date: 2018-06-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical switch used in the traditional way has a limited number of switches, and the adjustment is discrete, so it is necessary to find a device to continuously and actively adjust the power flow of the feeder where the distributed power supply is located.
[0004] Patent CN107104441A proposes a flexible power electronic switch, which solves the problems of unstable AC system frequency, loss caused by reactive power, and reverse power operation in low-voltage parallel power supply systems containing DC microgrids.

Method used

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  • Flexible multi-state switch and control method thereof
  • Flexible multi-state switch and control method thereof
  • Flexible multi-state switch and control method thereof

Examples

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Embodiment 1

[0048] Such as Figure 9 As shown, as a power electronic converter, the flexible multi-state switch of the present invention is connected between the first feeder K11 and the second feeder K22. Such as figure 1 As shown, the flexible multi-state switch of the present invention includes: a first isolation transformer T1, a second isolation transformer T2, a first controlled voltage source D11, a second controlled voltage source D22, a DC bus stabilizing capacitor C1 and a central controller. The first controlled voltage source D11 is connected to the second controlled voltage source D22 through the DC bus capacitor C1. The first feeder K11 is connected to the first controlled voltage source D11 through a first isolation transformer T1; the second feeder K22 is connected to the second controlled voltage source D22 through a second isolation transformer T2. One end of the central controller is connected to the voltage and current sampling and detection sensor, and the other end...

Embodiment 2

[0054] Such as Figure 6 As shown, this embodiment includes the first flexible multi-state switch A1, the second flexible multi-state switch A2, the third flexible multi-state switch A3, the fourth flexible multi-state switch A4...the nth flexible multi-state switch An, n≥ 3. The first substation B1, the second substation B2, the third substation B3...the mth substation Bm, where m≥3. The first substation B1 is connected to the second substation B2 through the second flexible multi-state switch A2, and is connected to the third substation B3 through the third flexible multi-state switch A3. The third substation B3 is connected to other substations through the fourth flexible multi-state switch A4. The mth substation Bm is connected to other substations through the nth flexible multi-state switch An. When the load of the first substation B1 is too large, the flexible multi-state switch can be used to provide active power support through the second substation B2 and the third ...

Embodiment 3

[0059] Such as Figure 7 As shown, this embodiment includes feeder K1, feeder K2, feeder K3, feeder K4, feeder K5, feeder K6, isolation transformer T1, isolation transformer T2, isolation transformer T3, isolation transformer T4, isolation transformer T5, isolation transformer T6, the first A controlled voltage source D1, a second controlled voltage source D2, a third controlled voltage source D3, a fourth controlled voltage source D4, a fifth controlled voltage source D5, a sixth controlled voltage source D6, and a DC bus capacitor C1, a DC bus capacitor C2, a DC bus capacitor C3, and a common DC bus. The feeder K1 is connected to the feeder K2 through the isolation transformer T1, the first controlled voltage source D1, the DC bus capacitor C1, the second controlled voltage source D2, and the isolation transformer T4, and the feeder K1, the isolation transformer T1, and the first controlled voltage source D1 , DC bus capacitor C1, second controlled voltage source D2, isolat...

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Abstract

Provided in the invention is a flexible multi-state switch comprising a first isolation transformer (T1), a first controlled voltage source (D11), a direct-current bus voltage-stabilizing capacitor (C1), a second controlled voltage source (D22), a second isolation transformer (T2), and a central controller. A first feeder line (K11) is connected to the first controlled voltage source (D11) throughthe first isolation transformer (T1); a second feeder line (K22) and the second controlled voltage source (D22) ) are connected by the second isolation transformer (T2); and the first controlled voltage source (D11) is connected to the second controlled voltage source (D22) through the direct-current bus capacitor (C1). Various functions including bidirectional circulation of active power betweenfeeder lines, reactive compensation control, short-circuit current suppression, power flow optimization and power quality management and the like are realized by applying different control methods onthe first controlled voltage source (D11) and the second controlled voltage source (D22) of the flexible multi-state switch.

Description

technical field [0001] The invention relates to a power electronic converter. Background technique [0002] In the medium and low voltage transmission feeder network, the network structure is generally open-loop radial. The voltage difference between the beginning and end of the feeder is large, and the current at the beginning of the feeder is relatively large, and the capacity requirements for the wire are relatively high. The ring network can bring better power flow distribution and balance the load of each line, but once a single-phase or three-phase ground short-circuit fault occurs, it will have a chain reaction on other lines and affect the normal power supply of other lines. Therefore, it is necessary to find a device that can not only use the ring network topology, but also ensure that other lines will not be affected when the power grid fails. [0003] With the gradual depletion of fossil energy, people are looking for ways to replace fossil energy for power gener...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02J3/00
CPCH02J3/0073H02J3/06
Inventor 霍群海郭心铭陆翌尹靖元许烽朱晋吴理心张桐硕韦统振
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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