CN209626956U - The relaying configuration system of low-voltage direct distribution system - Google Patents
The relaying configuration system of low-voltage direct distribution system Download PDFInfo
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- CN209626956U CN209626956U CN201920476726.0U CN201920476726U CN209626956U CN 209626956 U CN209626956 U CN 209626956U CN 201920476726 U CN201920476726 U CN 201920476726U CN 209626956 U CN209626956 U CN 209626956U
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Abstract
The utility model discloses a kind of relaying configuration system of low-voltage direct distribution system, DC bus is divided into 600VDC and 220VDC, and wherein 600VDC bus is connect by two-way AC/DC virtual synchronous machine with exchange 380V bus；Photovoltaic and energy storage pass through DC/DC converter respectively and are connected with 600VDC bus；220VDC bus is connected by DC/DC with 600VDC bus.600VDC with 220VDC bus passes through feeder line respectively and connects branch load.Utility model works effect is good.
Description
Technical field
The utility model relates to a kind of relaying configuration systems of low-voltage direct distribution system.
Background technique
With the continuous improvement that the continuous development and user of new energy technology require power quality, conventional electrical distribution system face
Face new challenge.Advantage of the DC distribution technology in consumption new energy and in terms of promoting power supply reliability receives more and more
Concern.Direct-flow distribution system either fault type or failure effect and AC distribution net is different, at present direct current interruption
Device is the common salvo of DC distribution net, but due to lacking mature, economical dc circuit breaker and practical operating experiences, directly
Streaming system protection becomes one of the key technical problem for restricting direct-flow distribution system development at present.
Summary of the invention
The purpose of this utility model is to provide a kind of relaying configuration systems of the low-voltage direct distribution system of good working effect
System.
The technical solution of the utility model is:
A kind of relaying configuration system of low-voltage direct distribution system, it is characterized in that: DC bus be divided into 600VDC and
220VDC, wherein 600VDC bus is connect by two-way AC/DC virtual synchronous machine with exchange 380V bus；Photovoltaic and energy storage difference
It is connected by DC/DC converter with 600VDC bus；220VDC bus is connected by DC/DC with 600VDC bus.600VDC and
220VDC bus connects branch load by feeder line respectively；
Protective device configuration is as follows:
(1) 600VDC incoming relay-protection device
Main protection section is two-way AC/DC virtual synchronous machine to 600VDC bus, while for bus and feeding out branch and provide
Standby；Using digital low-voltage direct branch protection device, quick-break, two sections of current-rising-rates, two sections of low pressure overcurrents, electric currents are configured
Integral, overvoltage, low-voltage, switching value interlock protection；
(2) 600VDC outgoing or branch protection configuration
Main protection section is this route；Using digital low-voltage direct branch protection device, quick-break is configured, on two sections of electric currents
Rise rate, two sections of low pressure overcurrents, current integration, overvoltage, low-voltage, switching value interlock protection；For photovoltaic branch, add with inverse function
Rate protection, current direction are directed toward bus by photovoltaic；For energy storage branch not set direction；For charging pile and distal end load loop
Direction is protected to be directed toward load by bus；
(3) 600V DC system earth relaying configuration
Using the insulation of digital low-voltage direct and earth protective device, impedance ground protection, residual current protection, voltage are configured
Unbalance protection；
(4) 600VDC busbar protective device
Using digital low-voltage direct busbar protective device, differential protection, under-voltage protection, overvoltage protection are configured；
(5) 220VDC bus branch protection device
Cooperate using using digital low-voltage direct branch protection device and active protective device, for inertia loading or
Other may cause the changed load of current direction to person, using the digital low-voltage direct branch protection with reverse-power protection
Device；Remaining load uses active protective device, is equipped with short-circuit protection, looped network protection, the protection of alternating current-direct current hybrid junction, insulate and connect
Ground defencive function.
The advantages of the utility model uses digital protecting mode, and inheriting tradition exchanges Microcomputer Protection, can be reliable, fast
It is fast, sensitive, selectively fault element cut off from DC distribution net；With microprocessor or digital signal processor
(DSP) it is core, incorporates signal transformation, sampling, calculating, logic judgment, executes the miscellaneous functions such as output and other communications, realize
Fault pre-alarming to electric system and quickly isolate function；Different types of defencive function is provided for different type route, it is real
Now it is directed to the effective protection of specific type failure；Using the design method of one or two amalgamation modes, wherein communication uses 485 interfaces
Or the standard Modbus agreement of Ethernet interface, large screen LCD display is had on device panel, it is dynamic with data and graphics mode
State shows main indicator parameter, is equipped with operation keyboard, can be configured to device hardware clock, monitoring parameters are configured,
It modifies and checks, and be equipped with protection password, realize the intelligent operation of protective device；Protective device is set using modularization in system
Meter improves system structure compactedness；Protective device has GPS time adjustment function, keeps consistent with the clock of distant place administrative center.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is low-voltage direct distribution system topological diagram.
Fig. 2 is low-voltage direct digital protecting hardware schematic.
Fig. 3 is protection system schematic.
Specific embodiment
A kind of relaying configuration system of low-voltage direct distribution system, DC bus are divided into 600VDC and 220VDC, wherein
600VDC bus is connect by two-way AC/DC virtual synchronous machine with exchange 380V bus；Photovoltaic and energy storage are become by DC/DC respectively
Parallel operation is connected with 600VDC bus；220VDC bus is connected by DC/DC with 600VDC bus.600VDC and 220VDC bus point
Branch load is not connected by feeder line；
Protective device configuration is as follows:
(1) 600VDC incoming relay-protection device
Main protection section is two-way AC/DC virtual synchronous machine to 600VDC bus, while for bus and feeding out branch and provide
Standby；Using digital low-voltage direct branch protection device, quick-break, two sections of current-rising-rates, two sections of low pressure overcurrents, electric currents are configured
Integral, overvoltage, low-voltage, switching value interlock protection；When protection act, which exports, to trip, when this section of tripping switchs, close
600VDC mother；In view of the two-way flow of power, all protections are without direction；
(2) 600VDC outgoing or branch protection configuration
Main protection section is this route；Using digital low-voltage direct branch protection device, quick-break is configured, on two sections of electric currents
Rise rate, two sections of low pressure overcurrents, current integration, overvoltage, low-voltage, switching value interlock protection；For photovoltaic branch, add with inverse function
Rate protection, current direction are directed toward bus by photovoltaic；For energy storage branch not set direction；For charging pile and distal end load loop
Direction is protected to be directed toward load by bus；When protection act, which exports, to trip, this branch switch is only jumped；
(3) 600V DC system earth relaying configuration
Using the insulation of digital low-voltage direct and earth protective device, impedance ground protection, residual current protection, voltage are configured
Unbalance protection, whens all protection acts, only send out alarm signal；
(4) 600VDC busbar protective device
Using digital low-voltage direct busbar protective device, differential protection, under-voltage protection, overvoltage protection are configured, it is poor
By inlet-outlet line branch switch all on tripping bus when dynamic protection act, remaining only sends out alarm signal；
(5) 220VDC bus branch protection device
By the way of using digital low-voltage direct branch protection device and active protective device cooperation, for inertia
Load or other may cause the changed load of current direction, using the digital low-voltage direct branch with reverse-power protection
Line protection device；Remaining load uses active protective device, is equipped with short-circuit protection, looped network protection, alternating current-direct current hybrid junction and protects, absolutely
Edge and ground protection function, when short trouble, active protective device can complete output locking, remaining failure in hundreds of microseconds
Branch and being isolated between bus are completed while alarm.
Main protection section is virtual synchronous machine to 600VDC bus, while for bus and feeding out branch and provide standby；Using
Digital low-voltage direct branch protection device, it is configuration quick-break, two sections of current-rising-rates, two sections of low pressure overcurrents, current integration, excessively electric
Pressure, low-voltage, switching value interlock protection.When protection act, which exports, to trip, when this section of tripping switchs, 600VDC mother is closed.
In view of the two-way flow of power, all protections are without direction；600VDC bus uses digital low-voltage direct bus protection
Device configures differential protection, under-voltage protection, overvoltage protection, by inlet-outlet lines all on tripping bus when differential protection acts
Branch switch, remaining only sends out alarm signal；220VDC bus feeder line branch is used to be filled using digital low-voltage direct branch protection
Set the mode with active protective device cooperation, for inertia loading or other to may cause current direction changed negative
Lotus, using the digital low-voltage direct branch protection device with reverse-power protection；Remaining load uses active protective device, matches
Standby short-circuit protection, looped network protection, the protection of alternating current-direct current hybrid junction, insulation and ground protection function, when short trouble, active protection is filled
Output locking can be completed in hundreds of microseconds by setting, remaining failure completes branch and being isolated between bus while alarm.
The core devices of the low-voltage direct digital protection equipment are 32 high-performance CPU, electric current, voltage and electric leakage
Stream signal, which will be connected respectively to 16 bit A/D converter part AD7606, AD7606 by the low-pass filtered device of signal amplification circuit, to be acquired
To analog quantity be converted into digital quantity be sent into CPU carry out analytical calculation；The result of calculating will be used as criterion, and generate and refer to accordingly
It enables and tripping outlet is issued to by Phototube Coupling, meanwhile, On-off signal can also be sent to CPU conduct by Phototube Coupling and open
The criterion of off status.For the protective device with recording function, corresponding recording flash, other periphery configurations are also distributed
It further include SRAM and touch screen.
In addition to except inertia loading or other may cause the changed load of current direction, remaining load is using actively
Formula protective device is equipped with short-circuit protection, looped network protection, the protection of alternating current-direct current hybrid junction, insulation and ground protection function.Short trouble
When, active protective device can complete output locking in hundreds of microseconds, remaining failure completes branch and mother while alarm
Isolation between line.
Claims (1)
1. a kind of relaying configuration system of low-voltage direct distribution system, it is characterized in that: DC bus is divided into 600VDC and 220VDC,
Wherein 600VDC bus is connect by two-way AC/DC virtual synchronous machine with exchange 380V bus；Photovoltaic and energy storage pass through DC/ respectively
DC converter is connected with 600VDC bus；220VDC bus is connected by DC/DC with 600VDC bus；600VDC and 220VDC is female
Line connects branch load by feeder line respectively；
Protective device configuration is as follows:
(1) 600VDC incoming relay-protection device
Main protection section is two-way AC/DC virtual synchronous machine to 600VDC bus, while for bus and feeding out branch and provide standby；
Using digital low-voltage direct branch protection device, configure quick-break, two sections of current-rising-rates, two sections of low pressure overcurrents, current integration,
Overvoltage, low-voltage, switching value interlock protection；
(2) 600VDC outgoing or branch protection configuration
Main protection section is this route；Using digital low-voltage direct branch protection device, quick-break is configured, two sections of electric currents rise
Rate, two sections of low pressure overcurrents, current integration, overvoltage, low-voltage, switching value interlock protection；For photovoltaic branch, add with inverse probability
Protection, current direction are directed toward bus by photovoltaic；For energy storage branch not set direction；Charging pile and distal end load loop are protected
It protects direction and load is directed toward by bus；
(3) 600V DC system earth relaying configuration
Using the insulation of digital low-voltage direct and earth protective device, configuration impedance ground protection, residual current protection, voltage are uneven
Weighing apparatus protection；
(4) 600VDC busbar protective device
Using digital low-voltage direct busbar protective device, differential protection, under-voltage protection, overvoltage protection are configured；
(5) 220VDC bus branch protection device
Cooperate using using digital low-voltage direct branch protection device and active protective device, for inertia loading or its
He may cause the changed load of current direction, be filled using the digital low-voltage direct branch protection with reverse-power protection
It sets；Remaining load uses active protective device, is equipped with short-circuit protection, looped network protection, the protection of alternating current-direct current hybrid junction, insulation and ground connection
Defencive function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920476726.0U CN209626956U (en) | 2019-04-10 | 2019-04-10 | The relaying configuration system of low-voltage direct distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920476726.0U CN209626956U (en) | 2019-04-10 | 2019-04-10 | The relaying configuration system of low-voltage direct distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209626956U true CN209626956U (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920476726.0U Active CN209626956U (en) | 2019-04-10 | 2019-04-10 | The relaying configuration system of low-voltage direct distribution system |
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| Country | Link |
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| CN (1) | CN209626956U (en) |
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2019
- 2019-04-10 CN CN201920476726.0U patent/CN209626956U/en active Active
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