CN207571221U - Test system based on the anti-isolated island protection of current transformer - Google Patents
Test system based on the anti-isolated island protection of current transformer Download PDFInfo
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- CN207571221U CN207571221U CN201721682644.9U CN201721682644U CN207571221U CN 207571221 U CN207571221 U CN 207571221U CN 201721682644 U CN201721682644 U CN 201721682644U CN 207571221 U CN207571221 U CN 207571221U
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Abstract
The utility model provides a kind of test system based on the anti-isolated island protection of current transformer; belong to grid-connected power supply technique field, to solve the technical issues of test device of current anti-isolated island protection is bulky, cost is high, a large amount of electric energy of consumption, power are difficult to match and are difficult to on-the-spot test.Including control system, power grid/load simulation current transformer and energy feedback current transformer；Power grid/load simulation current transformer and energy feedback current transformer are back-to-back, the exchange survey of power grid/load simulation current transformer is connect with distributed generation resource, the exchange survey of energy feedback current transformer is connect with power grid, and the DC side of power grid/load simulation current transformer is connect with the DC side of energy feedback current transformer；Control terminal of the control system respectively with power grid/load simulation current transformer and energy feedback current transformer is connect.The utility model have many advantages, such as it is simple in structure, system bulk can be reduced, is energy saving and a large amount of electric energy need not be consumed, can be applied to test site, testing efficiency higher.
Description
Technical field
The utility model is related to grid-connected power supply technique field more particularly to a kind of tests based on the anti-isolated island protection of current transformer
System.
Background technology
For the grid-connected system based on photovoltaic generation and wind-power electricity generation etc., when grid cut-off or distribution
Power supply from power grid disconnect when, if grid-connected system fails to detect power failure or is detached from power grid, it will work on and with
The load of surrounding forms an independently-powered islanded system, that is, so-called island effect occurs.Grid-connected system is in orphan
Serious consequence will be generated during the operating status of island, if the voltage in isolated island and frequency are unable to control to occur to fluctuate and even collapse,
Electrical equipment is damaged；Influence the protection switch operation program in distribution system；Circuit in isolated island still charges, may
Personal safety of entail dangers to service personnel etc..Based on this, when island phenomenon occurs, it is necessary to quickly and accurately test out, because
This, the test device of anti-isolated island protection is particularly significant.
The device of anti-isolated island protection test mainly simulates island load to carry out using adjustable RLC shunt loads at present
Test.However, this device is not only bulky, cost is high, a large amount of electric energy of consumption, power are difficult to match, but also lead at present
To be applied to test in laboratory, easily be interfered by extraneous factors such as weather, it is difficult to carry out on-the-spot test.
Invention content
The purpose of this utility model is that the test device of the current anti-isolated island protection of solution is bulky, cost is high, consumption
The technical issues of a large amount of electric energy, power are difficult to match and are difficult to on-the-spot test provides a kind of based on the anti-isolated island of current transformer
The test system of protection.
In order to solve the above technical problems, the technical solution adopted in the utility model is：
A kind of test system based on the anti-isolated island protection of current transformer, the test system include control system, power grid/load
Simulate current transformer and energy feedback current transformer；The power grid/load simulation current transformer and energy feedback current transformer are back-to-back, electricity
The exchange survey of net/load simulation current transformer is connect with distributed generation resource, and the exchange survey of energy feedback current transformer is connect with power grid, electricity
The DC side of net/load simulation current transformer is connect with the DC side of energy feedback current transformer；Control system respectively with power grid/load
Simulation current transformer is connected with the control terminal of energy feedback current transformer；The power grid/load simulation current transformer is in the test preparation stage
For power grid simulation model, power supply is provided, and absorb the electricity that distributed generation resource is sent out for distributed generation resource is grid-connected for simulating grid
Power；In test phase, load of the load simulation pattern as distributed generation resource is switched to from power grid simulation model, is absorbed distributed
The electric power that power supply is sent out, and the output voltage of the current regulation power grid/load simulation current transformer exported according to distributed generation resource；Institute
Energy feedback current transformer is stated in the test preparation stage, the grid-connected startup of distributed generation resource, absorbs electric energy from power grid, by power grid/
Load simulation current transformer provides startup electric energy for distributed generation resource；In test phase, power grid/load simulation current transformer is absorbed
The electric feedback that distributed generation resource is sent out is to power grid；The control system is used to control power grid/load simulation current transformer and energy
Feedback current transformer is according to default flow time-sharing work in test preparation stage or test phase.
Optionally, the test system further includes distributed electrical source switch K1, grid side switch K2 and grid side with dividing
Switch K3 between cloth mains side；The switch K4 that distributed generation resource carries surveys it with power grid/exchanging for load simulation current transformer
Between pass through distributed electrical source switch K1 connections；Exchanging for power grid and energy feedback current transformer switchs K2 between survey by grid side
Connection；By switching K3 connections between the switch K4 that power grid and distributed generation resource carry.
The beneficial effects of the utility model are：
By the way that back-to-back power grid/load simulation current transformer and energy feedback current transformer is set to form the survey of anti-isolated island protection
Test system so that the utility model simulates load using power grid/load simulation current transformer, under control of the control system, automatically
Burden with power and load or burden without work are adjusted, not only meets the requirement of the anti-isolated island protection test of distributed generation resource, but also energy can be passed through
Energy is fed back to power grid by amount feedback current transformer, and isolated island protection tester more anti-than traditional RLC types is more energy saving, and testing efficiency is more
It is high.Therefore, compared with background technology, the utility model have it is simple in structure, can reduce system bulk, it is energy saving and without consumption
A large amount of electric energy can be applied to the advantages that test site, testing efficiency higher.
Description of the drawings
Fig. 1 is the system composition schematic diagram of the utility model.
Specific embodiment
The utility model is described in further detail below in conjunction with drawings and examples.
As shown in Figure 1, the test system based on the anti-isolated island protection of current transformer in the present embodiment, including control system, electricity
Net/load simulation current transformer and energy feedback current transformer；The power grid/load simulation current transformer and energy feedback current transformer lean against
The back of the body, the exchange survey of power grid/load simulation current transformer are connect with distributed generation resource, and exchange survey and the power grid of energy feedback current transformer connect
It connects, the DC side of power grid/load simulation current transformer is connect with the DC side of energy feedback current transformer；Control system respectively with electricity
Net/load simulation current transformer is connected with the control terminal of energy feedback current transformer；The power grid/load simulation current transformer is accurate in test
The standby stage is power grid simulation model, and for simulating grid, being that distributed generation resource is grid-connected provides power supply, and absorbs distributed generation resource hair
The electric power gone out；In test phase, load of the load simulation pattern as distributed generation resource is switched to from power grid simulation model, is absorbed
The electric power that distributed generation resource is sent out, and the output of the current regulation power grid/load simulation current transformer exported according to distributed generation resource
Voltage；The energy feedback current transformer absorbs electric energy in the test preparation stage, the grid-connected startup of distributed generation resource, from power grid, leads to
It crosses power grid/load simulation current transformer and provides startup electric energy for distributed generation resource；In test phase, by power grid/load simulation unsteady flow
The electric feedback that sends out of distributed generation resource that device absorbs is to power grid；The control system is used to control power grid/load simulation unsteady flow
Device and energy feedback current transformer in the test preparation stage or test rank according to the default testing process time-sharing work that anti-isolated island is protected
Section.
Optionally, the test system further includes distributed electrical source switch K1, grid side switch K2 and grid side with dividing
Switch K3 between cloth mains side；The switch K4 that distributed generation resource carries surveys it with power grid/exchanging for load simulation current transformer
Between pass through distributed electrical source switch K1 connections；Exchanging for power grid and energy feedback current transformer switchs K2 between survey by grid side
Connection；By switching K3 connections between the switch K4 that power grid and distributed generation resource carry.The control system is distributed by controlling
Formula source-side switches K1 is closed that power grid/load simulation current transformer is controlled to come into operation, and is closed by the way that grid side is controlled to switch K2
The energy feedback current transformer is controlled to come into operation, switching K3 by control is closed that distributed generation resource is controlled to be connected to the grid.
The test method of the above-mentioned test system based on the anti-isolated island protection of current transformer, includes the following steps 1 to step 4：
Step 1, control system control energy feedback current transformer is connected to the grid, and generates steady dc voltage, is power grid/negative
The input of lotus simulation current transformer is ready.
Energy feedback current transformer works in the test preparation stage in the step 1, after the stage energy feedback current transformer is grid-connected
Electric energy production steady dc voltage is absorbed to power for power grid/load simulation current transformer from power grid, and then be distributed generation resource
Offer start electric energy.
Step 2, control system control power grid/load simulation current transformer input, and enter power grid simulation model, generate stabilization
Exchange stream output voltage, be ready for the input of distributed generation resource.
In the step 2, power grid/load simulation current transformer works in the test preparation stage, and the stage power grid/load simulation becomes
Flow device simulating grid, stable ac output voltage is generated under the action of energy feedback current transformer, with for distributed generation resource simultaneously
Net provides power supply, and absorbs the electric power that distributed generation resource is sent out.
Step 3, control system control distributed generation resource comes into operation.
Step 4, after distributed generation resource the operation is stable, control system controls power grid/load simulation current transformer by power grid mould
Simulation models switches to load simulation pattern, and whether start the anti-isolated island defencive function of test distributed power supply normal；If normal,
Then test passes through, if abnormal, test and does not pass through.
In step 4, power grid/load simulation current transformer absorbs distributed generation resource and sends out after distributed generation resource the operation is stable
Electric power, and according to distributed generation resource export current regulation power grid/load simulation current transformer output voltage, energy feedback become
Device is flowed by the electric feedback that the distributed generation resource that power grid/load simulation current transformer absorbs is sent out to power grid.
Wherein, when whether the anti-isolated island defencive function of test distributed power supply normal, power grid/load simulation current transformer according to
GB/T30152-2013《Photovoltaic generating system access power distribution network detection regulation》Requirement, simulate resistive, capacitive and inductive load,
And passed through by adjusting payload to be tested and tested whether.
Optionally, the system composition provided based on Fig. 1, the test method are further included：Control system is by controlling power grid
Side switch K2 is closed that energy feedback current transformer is controlled to be connected to the grid；Control system is closed by the way that distributed electrical source is controlled to switch K1
It closes that power grid/load simulation current transformer is controlled to come into operation；Control system switchs K3 by control and is closed to control distributed electrical
Source is connected to the grid.
It is understood that embodiment of above is merely to illustrate that the principle of the utility model and uses exemplary
Embodiment, however the utility model is not limited thereto.For those skilled in the art, this is not being departed from
In the case of the spirit and essence of utility model, various changes and modifications can be made therein, these variations and modifications are also considered as this reality
With novel protection domain.
Claims (2)
1. a kind of test system based on the protection of current transformer anti-isolated island, which is characterized in that the test system include control system,
Power grid/load simulation current transformer and energy feedback current transformer；The power grid/load simulation current transformer and the energy feedback current transformer back of the body
Backrest, the exchange survey of power grid/load simulation current transformer are connect with distributed generation resource, the exchange survey of energy feedback current transformer and power grid
Connection, the DC side of power grid/load simulation current transformer are connect with the DC side of energy feedback current transformer；Control system respectively with electricity
Net/load simulation current transformer is connected with the control terminal of energy feedback current transformer；
The power grid/load simulation current transformer is power grid simulation model in the test preparation stage, is distribution for simulating grid
Power grid provides power supply, and absorbs the electric power that distributed generation resource is sent out；In test phase, it is switched to from power grid simulation model negative
Load of the lotus simulation model as distributed generation resource absorbs the electric power that distributed generation resource is sent out, and is exported according to distributed generation resource
Current regulation power grid/load simulation current transformer output voltage；The energy feedback current transformer is in test preparation stage, distribution
When formula power grid starts, electric energy is absorbed from power grid, startup electricity is provided for distributed generation resource by power grid/load simulation current transformer
Energy；In test phase, by the electric feedback that the distributed generation resource that power grid/load simulation current transformer absorbs is sent out to power grid；It is described
Control system is used to control the default test stream that power grid/load simulation current transformer and energy feedback current transformer are protected according to anti-isolated island
Journey time-sharing work is in test preparation stage or test phase.
2. test system according to claim 1, which is characterized in that the test system further includes distributed electrical source and opens
Close the switch K3 between K1, grid side switch K2 and grid side and distributed electrical source；Switch K4 that distributed generation resource carries with
K1 connections are switched by distributed electrical source between the exchange survey of power grid/load simulation current transformer；Power grid and energy feedback unsteady flow
K2 connections are switched by grid side between the exchange survey of device；By switching K3 between the switch K4 that power grid and distributed generation resource carry
Connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721682644.9U CN207571221U (en) | 2017-12-06 | 2017-12-06 | Test system based on the anti-isolated island protection of current transformer |
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| CN201721682644.9U CN207571221U (en) | 2017-12-06 | 2017-12-06 | Test system based on the anti-isolated island protection of current transformer |
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| CN207571221U true CN207571221U (en) | 2018-07-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831394A (en) * | 2017-12-06 | 2018-03-23 | 国网山西省电力公司临汾供电公司 | Test system and its method of testing based on the anti-isolated island protection of current transformer |
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- 2017-12-06 CN CN201721682644.9U patent/CN207571221U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831394A (en) * | 2017-12-06 | 2018-03-23 | 国网山西省电力公司临汾供电公司 | Test system and its method of testing based on the anti-isolated island protection of current transformer |
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