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Time division multiplexing multi-level circuit and insulation impedance detection method

A time-division multiplexing, insulation impedance technology, applied in the measurement of resistance/reactance/impedance, monitoring of photovoltaic systems, logic circuit connection/interface layout, etc., can solve problems such as influence, detection signal interference, and poor impedance detection accuracy.

Pending Publication Date: 2022-04-08
深圳市禾望科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As shown in schemes 1 and 2, although the insulation resistance detection of the system is realized, after the insulation resistance detection is completed, the external resistance for impedance change is always applied between the positive and negative busbars and PE. When PE is "dirty", PE is easy to affect the system control ground through this circuit, causing other detection signals of the system to be interfered, causing system stability;
[0011] Due to the limitation of the number of switches, the current solution can only ensure that the insulation resistance detection of the system to the ground is relatively accurate within a certain range (generally, sampling and calibration are only performed in a lower impedance range), and the impedance detection accuracy is poor when it exceeds a certain range

Method used

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  • Time division multiplexing multi-level circuit and insulation impedance detection method
  • Time division multiplexing multi-level circuit and insulation impedance detection method
  • Time division multiplexing multi-level circuit and insulation impedance detection method

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Embodiment 1

[0034] see Figure 4 , Figure 4 It is the circuit diagram of the second embodiment of the time-division multiplexed multi-level circuit of the present invention; this embodiment discloses a time-division multiplexed multi-level circuit, including 2n+5 switch tubes, 2n+4 impedance networks, Detection and control unit; the 2n+5 switching tubes are respectively: the first switching tube T0, the second switching tube T1...the 2n+4th switching tube T2n+3, the 2n+5th switching tube T2n+4; the The 2n+4 impedance networks are: the first impedance network Z1, the second impedance network Z2, ..., the 2n+3th impedance network Z2n+3, the 2n+4th impedance network Z2n+4, the first switching tube T1 and the th One impedance network Z1 is connected in parallel, the second switch tube T2 is connected in parallel with the second impedance network Z2, and so on, the 2n+4 switch tube T2n+3 is connected in parallel with the 2n+3 impedance network Z2n+3, and the 2n+5 switch tube T2n+4 and the 2...

Embodiment 2

[0038] In this embodiment, on the basis of Embodiment 1, n is zero, and the five switching tubes are: the first switching tube T0, the second switching tube T1, the third switching tube T2, the fourth switching tube T3 and the fifth switching tube. The switching tube T4; the four impedance networks are respectively: the first impedance network Z1, the second impedance network Z2, the third impedance network Z3, and the fourth impedance network Z4; the second switching tube T1 and the first impedance network The network Z1 is connected in parallel, the third switching tube T2 is connected in parallel with the second impedance network Z2, the fourth switching tube T3 is connected in parallel with the third impedance network Z3, and the fifth switching tube T4 is connected in parallel with the fourth switching tube T4. The impedance network Z4 is connected in parallel, one end of the second switching tube T1 is connected to the positive bus, the other end of the second switching t...

Embodiment 3

[0040] This embodiment discloses a method for detecting insulation resistance of a time-division multiplexed multi-level circuit, which includes the following steps:

[0041] The detection and control unit calculates and obtains at least two groups of positive and negative busbar-to-ground impedance values ​​according to the voltage change of the positive and negative busbars to ground detected when the state of the switching tube is switched;

[0042] The said "the detection and control unit calculates and obtains at least two groups of positive and negative busbar-to-ground impedance values ​​according to the voltage change of the positive and negative busbars to ground detected when the switching tube is switched" specifically: the said detection and control unit By switching the state of the second switching tube T1 and the first switching tube T0, and cooperating with the first impedance network Z1, the second impedance network Z2, the third impedance network Z3 and the fo...

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Abstract

The invention discloses a time division multiplexing multi-level circuit, which comprises switching tubes, an impedance network, a detection and control unit and a bus, and is characterized in that the switching tubes are respectively a first switching tube, a second switching tube, a third switching tube, a fourth switching tube and a fifth switching tube; the impedance networks comprise a first impedance network, a second impedance network, a third impedance network and a fourth impedance network; a second switch tube is connected with the first impedance network in parallel, a third switch tube is connected with the second impedance network in parallel, a fourth switch tube is connected with the third impedance network in parallel, and a fifth switch tube is connected with the fourth impedance network in parallel. According to the time-division multiplexing multi-level circuit and the insulation impedance detection method, the precision of the insulation impedance detection range can be improved in a wider range, impedance networks artificially added for calculating the insulation impedance in the current market are reduced, switching tubes for impedance switching can also be reduced, and the system cost is reduced while the performance is improved.

Description

technical field [0001] The invention relates to the technical field of wind power photovoltaic power generation systems, in particular to a time-division multiplexed multi-level circuit and an insulation resistance detection method. Background technique [0002] In the photovoltaic system, the safety and stability of the system must be guaranteed. From the perspective of safety, electric shock prevention is the most basic requirement. As a simple and easy detection solution for electric shock prevention, the National Energy Administration From the standard level, there is a rigid requirement for the inverter, the core component of the photovoltaic system: each must have the insulation resistance detection function. For this reason, various photovoltaic system insulation resistance detection schemes have emerged as the times require. [0003] Prior art scheme 1: such as figure 1 as shown, figure 1 It is a dual-switch switching method insulation resistance detection circuit ...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R1/28H02S50/00H03K19/0175
CPCY02E10/50
Inventor 曾建友陈利周党生文熙凯
Owner 深圳市禾望科技有限公司