Insulation monitoring device applied to power system and power system

Patent metadata

Field	Value
Publication number	US-11575312-B2
Application number	US-202016930329-A
Country	US
Kind code	B2
Filing date	Jul 16, 2020
Priority date	Aug 28, 2019
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

Embodiments of the present disclosure provide an insulation monitoring device applied to a power system and a power system. The power system includes at least one power electronic converter module. The insulation monitoring device includes an insulation component, a signal source, an impedance module, and a monitoring module. The insulation component at least partially wraps around the power electronic converter module. The signal source is electrically coupled to a circuit node in the power electronic converter module, the impedance module is connected between the signal source and the insulation component, and the monitoring module is configured to monitor an insulation resistance value of the insulation component, so that an insulation state of the power electronic converter module may be determined.

First claim

What is claimed is:

1. An insulation monitoring device applied to a power system, wherein,
the power system comprises at least one power electronic converter module, and the insulation monitoring device comprises an insulation component, a signal source, an impedance module, and a monitoring module;
the insulation component surrounds the power electronic converter module;
the signal source is electrically coupled to a circuit node in the power electronic converter module;
the impedance module is connected between the signal source and the insulation component; and
the monitoring module is configured to monitor an insulation resistance value of the insulation component.

2. The insulation monitoring device according to claim 1 , wherein the insulation component comprises a charged body layer, a solid insulation layer and a ground layer, the solid insulation layer is disposed between the charged body layer and the ground layer; the charged body layer is disposed at one side of the insulation component close to the power electronic converter module; and the ground layer is disposed at one side of the insulation component away from the power electronic converter module, and is grounded.

3. The insulation monitoring device according to claim 1 , wherein the circuit node is at least one of a bridge arm midpoint in the power electronic converter module and a node on a positive and negative direct current bus in the power electronic converter module.

4. The insulation monitoring device according to claim 1 , wherein the circuit node is a circuit node in a converter that provides auxiliary power to the power electronic converter module.

5. The insulation monitoring device according to claim 3 , wherein a voltage waveform of the circuit node comprises a direct current component.

6. The insulation monitoring device according to claim 4 , wherein a voltage waveform of the circuit node comprises a direct current component.

7. The insulation monitoring device according to claim 1 , wherein the insulation monitoring device further comprises a support portion disposed between the power electronic converter module and the charged body layer, so that a gap is introduced between the power electronic converter module and the charged body layer.

8. The insulation monitoring device according to claim 7 , wherein the support portion is composed of an insulating material, and the impedance module is disposed inside or outside the support portion.

9. The insulation monitoring device according to claim 7 , wherein the support portion forms at least a portion of the impedance module.

10. The insulation monitoring device according to claim 1 , wherein the insulation monitoring device further comprises an insulation layer disposed between the power electronic converter module and the charged body layer.

11. The insulation monitoring device according to claim 1 , wherein the impedance module comprises any one or more of a resistive device, an inductive device, and a capacitive device.

12. The insulation monitoring device according to claim 1 , wherein the impedance module comprises at least one LC filter circuit.

13. The insulation monitoring device according to claim 11 , wherein the impedance module comprises at least one LC filter circuit.

14. The insulation monitoring device according to claim 1 , comprising a plurality of insulation components, an impedance module corresponding to each of the insulation components is connected between a corresponding signal source and the insulation component.

15. The insulation monitoring device according to claim 1 , wherein the power electronic converter module comprises a transformer or an inductor, at least one insulation component at least partially wraps around at least a portion of a winding of the transformer or the inductor; and an impedance module corresponding to the insulation component is connectable in a serial manner between any one of electrical nodes of the winding and the insulation component, or distributedly connected in series between a plurality of electrical nodes of the winding and the insulation component.

16. The insulation monitoring device according to claim 14 , wherein the power electronic converter module comprises a transformer or an inductor, at least one of the plurality of insulation components at least partially wraps around at least a portion of a winding of the transformer or the inductor; and an impedance module corresponding to the insulation component is connectable in a serial manner between any one of electrical nodes of the winding and the insulation component, or distributedly connected in series between a plurality of electrical nodes of the winding and the insulation component.

17. A power system, wherein the power system comprises an insulation monitoring device, and the insulation monitoring device is an insulation monitoring device according to claim 1 .

Assignees

• Delta Electronics Shanghai Co

Inventors

• Xie Yicong
• Zhang Weiqiang
• Ma Peng
• Zhou Wei

Classifications

• G01R31/1272

  of cable, line or wire insulation, e.g. using partial discharge measurements (locating faults in cables G01R31/083) · CPC title

• H02M1/0074

  Plural converter units whose inputs are connected in series · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title

• G01R31/1263

  of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation · CPC title

• G01R31/40

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title