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Detection device and detection method for photovoltaic anti-islanding test

A detection device and detection method technology, applied in the direction of measuring device, measuring electricity, measuring electric variables, etc., can solve the problem of abnormal output voltage and frequency of photovoltaic power generation system, loss of voltage and frequency control of power company, and accidental contact of live electricity by operators and other problems, to achieve the effect of accurate detection of island effect, improvement of precision, and simple structure

Inactive Publication Date: 2015-03-04
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the system continues to supply power, it may cause the operator to accidentally touch the electrified body, causing personal injury or death
[0005] 2) Equipment damage
[0009] (3) The power company loses control of the voltage and frequency during the island operation, but may be involved in a dispute of "responsible for others" due to the abnormal output voltage and frequency of the photovoltaic power generation system
[0012] (1) The mismatch between the output active power of the PV inverter and the power consumed by the load is greater than 50%; or when the local load power factor is less than 95%, the power supply to the grid must be stopped within 10 cycles after the grid loses voltage

Method used

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  • Detection device and detection method for photovoltaic anti-islanding test
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  • Detection device and detection method for photovoltaic anti-islanding test

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Effect test

Embodiment 1

[0040] like figure 1 As shown, an anti-islanding test detection device is composed of a host computer, more than one intelligent power monitoring module, an I / O relay control board, an electric key K and a load module; The intelligent power monitoring module and the I / O relay control board; the I / O relay control board is connected to the load module via the electric key K; the I / O relay control board connected to the load module comprises a single-chip microcomputer; the load module is composed of resistive The load R, the inductive load L and the capacitive load C are composed; the values ​​of the resistive load R', the inductive load L' and the capacitive load C' can be adjusted under the control of the microcontroller of the I / O relay control board.

[0041] The I / O relay control board is used to control the relays. The load element is used to simulate the power dissipation element of the actual high-capacity AC load. The upper computer is a PC, and a human-computer inter...

Embodiment 2

[0052] A detection method for the anti-islanding test detection device described in claim 1, comprising the following concrete steps:

[0053] (1) Selective loading: After the switch on the grid side is tripped for at least 0.5s, close the key K, and connect the load module to the grid in parallel;

[0054] (2) Signal acquisition and transmission: The voltage sensor and current sensor collect the sum of the voltage and current signals after grid connection and transmit it to the host computer;

[0055] (3) The host computer receives and stores data processing: the host computer receives and stores the voltage and current signals after grid connection; calculates the phase and frequency changes of the voltage and current signals before and after the load module is loaded;

[0056] (4) Island judgment: After judging the load module, the measured voltage V Is it satisfied:

[0057] when

[0058] In the formula, V nom is the effective value of grid voltage; if yes, no is...

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Abstract

The invention discloses a detection device and a detection method for photovoltaic anti-islanding test. The detection device is composed of an upper computer, more than one intelligent power monitoring module, an I / O relay control plate, keyset K and a load module; the upper computer PC machine is connected with each intelligent power monitoring module and I / O relay control plate respectively through the CAN bus; the I / O relay control plate is connected with the load module through the keyset K; the load module is composed of a numerical value adjustable resistive load R, inductive load L and capacitive load C. The detection method judges whether the grid-connected measured voltage V satisfies the formula and judges whether the islanding phenomenon occurs after uploading the load module. The detection device and the detection method can exactly detect the islanding effect and are applied to various large capacity power devices for test.

Description

technical field [0001] The invention relates to an anti-islanding test detection device and a detection method, in particular to a photovoltaic anti-islanding test detection device and detection method, belonging to the field of power system control. Background technique [0002] When photovoltaic power generation and other distributed power generation systems are connected to the public grid, island detection is an essential and important function. "Island" refers to the existence of distributed power generation after the public power grid stops supplying power, so that some lines in the power outage area of ​​the power grid remain electrified, forming an island of self-sufficient power supply. In the island state, the power company loses control of the line voltage and frequency, which will bring a series of potential safety hazards and accident disputes: [0003] 1) Personal safety. After the power grid is powered off, electrical maintenance personnel enter the power ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 胡文平范辉段晓波王磊周文
Owner STATE GRID CORP OF CHINA
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