CN105826952A - Power supply access device and protection method thereof - Google Patents

Power supply access device and protection method thereof Download PDF

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Publication number
CN105826952A
CN105826952A CN201610343639.9A CN201610343639A CN105826952A CN 105826952 A CN105826952 A CN 105826952A CN 201610343639 A CN201610343639 A CN 201610343639A CN 105826952 A CN105826952 A CN 105826952A
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CN
China
Prior art keywords
voltage
energy
access
load
generator unit
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CN201610343639.9A
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Chinese (zh)
Inventor
朱凤天
王龙飞
夏耀杰
赵晓凯
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上海电气分布式能源科技有限公司
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Priority to CN201610343639.9A priority Critical patent/CN105826952A/en
Publication of CN105826952A publication Critical patent/CN105826952A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J4/00Circuit arrangements for mains or distribution networks not specified as ac or dc

Abstract

The invention provides a power supply access device which is used for connecting a power generation unit and an energy storage unit and supplying power to a load. The power supply access device comprises a controller, and a rectifier, a direct-current converter and an inverter which are connected with the controller. The power supply access device further comprises a power generation unit protection unit, an energy storage protection unit, a load protection unit and a system protection unit which are connected with the controller. The invention further provides a protection method of the power supply access device. According to the power supply access device and the protection method thereof provided by the invention, the power generation unit, the energy storage unit, the load and the system are protected in a comprehensive and coordinated way by the protection units connected with the controller, the power supply system does not stop supplying power due to failure of the power generation unit or other reasons, and safe and reliable operation of the whole power supply system is ensured.

Description

A kind of power supply access device and guard method thereof
Technical field
The present invention relates to field of electrical control, be specifically related to a kind of power supply access device and guard method thereof.
Background technology
Wind-powered electricity generation and photovoltaic have intermittent and randomness feature, independent wind energy turbine set and photovoltaic plant are difficult to provide the energy output of continuous-stable, therefore wind generator system and photovoltaic generating system have difficult prediction, difficult control, the feature of difficult scheduling, the safety and stability of power supply is also brought bigger hidden danger, although wind and solar hybrid generating system can carry out complementation in certain degree, but both there is bigger randomness, in wind and solar hybrid generating system, therefore add energy storage device composition wind-light storage electricity generation system.Wind-solar-storage joint electricity generation system is by the storage of wind-powered electricity generation and photovoltaic and release, the energy that can make instability becomes the stable power product with higher quality, it is effectively improved the power out-put characteristic of whole wind and light generating system, increases electrical network and regenerative resource is received degree.
Wind-power electricity generation, photovoltaic generation and energy storage device are the important component parts of intelligent micro-grid, for a typical micro-grid system, need the energy of multiple passages such as Appropriate application wind, light, storage simultaneously, in addition to the electric elements such as needs inverter, controller, DCDC circuit, also need to, on control strategy, each micro battery is coordinated control, to reach stability and the economy of system.Meanwhile, implement concrete comprehensive protective measure for each micro battery, it is possible to improve wind light generation characteristic, maximally utilize scene resource, give full play to every advantage of distributed power source, improve combined generating system predictability, controllability and adjustability.
Wind-light storage powered products/system conventional on the market, in addition to blower fan, photovoltaic module, accumulator, mainly comprises the key feature such as inverter, controller, unloader, DCDC device, belongs to the integrated products of above-mentioned functions parts.But meanwhile, the country/industry standard for this series products is not also put into effect, only have for single class micro battery inverter, the country/industry standard of single class micro source controller.Therefore this series products is whether required to reference to being enclosed within column criterion in early stage design or later stage test certification more.The comprehensively research the most concrete to Preservation tactics of existing wind-light storage like product, if realizing defencive function to rely on single protection device, it is impossible to realize controlling three kinds of comprehensive protection coordinations of power supply.
Summary of the invention
In view of problems of the prior art; it is an object of the invention to provide a kind of power supply access device; by the protected location being connected with controller; generator unit, energy-storage units, load and system are carried out comprehensive, harmonious protection; generator unit fault or do not result in electric power system stop power supply owing to a variety of causes can not generate electricity, thus ensure that whole electric power system is run safely and reliably.
The present invention also provides for the guard method of a kind of access device of powering.
The present invention provides a kind of power supply access device; for accessing generator unit and energy-storage units and powering to the load; power supply access device includes that controller and the commutator, DC converter and the inverter that are connected with controller, power supply access device also include generator unit protected location, energy storage protected location, load protection unit and the system protection unit being connected with controller.
Further, one or more during generator unit is blower fan, photovoltaic or diesel-driven generator.
Further, corresponding to generator unit, generator unit protected location is one or more in blower fan protected location, photovoltaic protected location or diesel-driven generator protected location.
Further, blower fan protected location includes harvester, brake unit and blower fan gate-controlled switch, and harvester is used for gathering ambient wind velocity, and brake unit is for braking described blower fan, and blower fan gate-controlled switch is used for being switched on or switched off described blower fan.
Further, photovoltaic protected location includes the photovoltaic gate-controlled switch for being switched on or switched off photovoltaic module and photovoltaic alarm device.
Further; energy storage protected location includes current detection circuit, voltage detecting circuit and energy storage gate-controlled switch; current detection circuit is for detecting the electric current of energy-storage units, and voltage detecting circuit is for detecting the voltage of energy-storage units, and energy storage gate-controlled switch is used for being switched on or switched off energy-storage units.
Further; load protection unit include load current detection circuit, load voltage testing circuit, load short circuits detection module, for be switched on or switched off load load gate-controlled switch and load alarm device; load current detection circuit is used for detecting load current; load voltage testing circuit is used for detecting load voltage, and load short circuits detection module is the most short-circuit for load.
Further; controller includes the pulse-width modulation circuit controlling blower fan, photovoltaic module and energy-storage units respectively, and system protection unit includes unloader, blower fan input electric cur-rent measure circuit, blower fan input voltage detection circuit, photovoltaic module input electric cur-rent measure circuit, photovoltaic module input voltage detection circuit, DC bus current testing circuit, direct current bus voltage detecting circuit and short-circuit detecting module.
Further, system protection unit also includes back discharge protected location and/or lightning protected unit.
The present invention also provides for the guard method of a kind of above-mentioned power supply access device, comprises the following steps:
A () detects whether to there is stream, if there is crossing stream, the corresponding positions set of faulty word, enter corresponding error protection;
B () detects whether to there is overload, if there is overload, the corresponding positions set of faulty word, enter corresponding error protection;
C () detects whether to there is overvoltage, if there is overvoltage, the corresponding positions set of faulty word, enter corresponding error protection;
D () detects whether to exist under-voltage, if there is under-voltage, and the corresponding positions set of faulty word, enter corresponding error protection;
E () detects whether to there is short circuit, if there is short circuit, faulty word set, enter corresponding error protection;
F () often through the detection cycle that error protection is corresponding, detects the fault of faulty word set again, if having met recovery condition, then the corresponding positions of faulty word resets and exits corresponding error protection.
Further, if there is crossing stream in step (a), carry out corresponding error protection and comprise the following steps:
(a1) if the overcurrent of energy-storage units, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses;
(a2) if load overcurrent, disconnect output gate-controlled switch and stop output;
(a3) if the input current of generator unit crosses stream, the pulse-width signal of disabling generator unit, stop generator unit and access;
(a4) if dc bus crosses stream, disconnect output gate-controlled switch and stop output.
Further, if there is overload in step (b), carry out corresponding error protection and comprise the following steps:
(b1) if load overload, disconnect output gate-controlled switch and stop output;
(b2) if generator unit overload, the pulse-width signal of disabling generator unit, stop generator unit and access;
Further, if there is overvoltage in step (c), carry out corresponding error protection and comprise the following steps:
(c1) if the electric voltage over press of high direct voltage bus, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses, start unloader;
(c2) if generator unit input voltage is more than or equal to stopping voltage, the pulse-width signal of disabling generator unit, stop generator unit and access.
Further, if there is under-voltage in step (d), carry out corresponding error protection and comprise the following steps:
(d1) if generator unit input voltage is less than starting voltage, the pulse-width signal of disabling generator unit, stop generator unit and access;
(d2) if dc bus is under-voltage, disconnect output gate-controlled switch and stop output.
Further, if there is short circuit in step (e), carry out corresponding error protection and comprise the following steps:
(e1) if load short circuits, disconnect output gate-controlled switch and stop output;
(e2) if power supply access device short circuit, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses.
Further, the guard method of power supply access device is further comprising the steps of:
When () power supply access device starts g, detect whether to there is reversal connection, if there is reversal connection, disconnect respective channel, stop starting.
Further, step (g) detects whether to exist reversal connection, disconnects respective channel and comprise the following steps:
(g1) if photovoltaic module reversal connection, disconnect photovoltaic gate-controlled switch, and report to the police on photovoltaic alarm device;
(g2) if energy-storage units reversal connection, energy storage gate-controlled switch is disconnected;
(g3) if load reversal connection, disconnect output gate-controlled switch and stop output, and report to the police on load alarm device.
Further, the guard method of power supply access device is further comprising the steps of:
(h) detection energy-storage units voltage, if greater than or equal to be full of magnitude of voltage, stop charging;Often charge the detection cycle through energy-storage units, again detection energy-storage units voltage, if less than or equal to recovering charging voltage value, recover charging.
Further, the guard method of power supply access device comprises the following steps:
(i) detection ambient wind velocity whether more than or equal to cut-out wind speed, if greater than or equal to cut-out wind speed, the corresponding positions set of faulty word, disconnect blower fan gate-controlled switch, and blower fan braked;Often through a blower fan braking performance test cycle, again detect ambient wind velocity, if greater than or equal to cut-out wind speed, keep error protection;If less than cut-out wind speed, the corresponding positions of faulty word resets, and closes blower fan gate-controlled switch, stops braking blower fan.
Further, the guard method of power supply access device is further comprising the steps of:
J () detects whether to there is thunder and lightning, if there is thunder and lightning, enter lightning protection.
Compared with prior art; the power supply access device of present invention offer and guard method thereof; have the advantages that the protected location by being connected with controller; generator unit, energy-storage units, load and system are carried out comprehensive, harmonious protection; generator unit fault or do not result in electric power system stop power supply owing to a variety of causes can not generate electricity, it is ensured that whole electric power system is run safely and reliably.
Accompanying drawing explanation
Fig. 1 is the structural representation of the power supply access device of one embodiment of the present of invention;
Fig. 2 is the flow chart of the guard method of the power supply access device shown in Fig. 1.
Detailed description of the invention
As shown in Figure 1; the power supply access device of one embodiment of the present of invention; for accessing generator unit and energy-storage units and powering to the load; power supply access device includes that controller and the commutator, DC converter and the inverter that are connected with controller, power supply access device also include generator unit protected location, energy storage protected location, load protection unit and the system protection unit being connected with controller.
In the present embodiment, generator unit is blower fan and photovoltaic.
Corresponding to generator unit, generator unit protected location includes blower fan protected location and photovoltaic protected location.
Blower fan protected location includes harvester, brake unit and blower fan gate-controlled switch, and harvester is used for gathering ambient wind velocity, and brake unit is for braking blower fan, and blower fan gate-controlled switch is used for being switched on or switched off blower fan.
Photovoltaic protected location includes the photovoltaic gate-controlled switch for being switched on or switched off photovoltaic module and photovoltaic alarm device.
Energy storage protected location includes current detection circuit, voltage detecting circuit and energy storage gate-controlled switch, and current detection circuit is for detecting the electric current of energy-storage units, and voltage detecting circuit is used for detecting energy-storage units voltage, and energy storage gate-controlled switch is used for being switched on or switched off energy-storage units.
Load protection unit include load current detection circuit, load voltage testing circuit, load short circuits detection module, for be switched on or switched off load load gate-controlled switch and load alarm device; load current detection circuit is used for detecting load current; load voltage testing circuit is used for detecting load voltage, and load short circuits detection module is the most short-circuit for load.
Controller includes the pulse-width modulation circuit controlling blower fan, photovoltaic module and energy-storage units respectively, and system protection unit includes unloader, blower fan input electric cur-rent measure circuit, blower fan input voltage detection circuit, photovoltaic module input electric cur-rent measure circuit, photovoltaic module input voltage detection circuit, DC bus current testing circuit, direct current bus voltage detecting circuit and short-circuit detecting module.
System protection unit can also include back discharge protected location and/or lightning protected unit; in the present embodiment, system protection unit includes back discharge protected location and lightning protected unit, and back discharge protected location has accessed, for preventing the electric energy of generator unit or the energy-storage units accessed from reversely exporting, the generator unit not producing electric energy.
By the gate-controlled switch in generator unit protection device and back discharge protected location, it is possible to fault generator unit is isolated, thus does not results in and stop power supply.
Above-mentioned voltage, current detection circuit can be divided into two big classes: the detection of DC voltage and current and the detection of alternating voltage electric current, wherein the exchange that blower fan inputs is become direct current by three-phase commutation bridge, then detects electric current, magnitude of voltage by blower fan input electric cur-rent measure circuit, blower fan input voltage detection circuit.
DC voltage, current detecting: the voltage x current of direct current is carried out by direct current voltage sensor and DC current sensor respectively the collection of voltage x current, the signal of collection is sent into amplifier and carries out signal condition, subsequently the signal after conditioning is accessed A/D converter and the digital signal after conversion is sent into DSP process.
Alternating voltage, current detecting: roughly the same with direct current, difference is in the type selecting of sensor the voltage sensor current sensor for exchanging detection used.
The guard method of the power supply access device in the present embodiment, as in figure 2 it is shown, comprise the following steps:
A () detects whether to there is stream, if there is crossing stream, the corresponding positions set of faulty word, enter corresponding error protection;
B () detects whether to there is overload, if there is overload, the corresponding positions set of faulty word, enter corresponding error protection;
C () detects whether to there is overvoltage, if there is overvoltage, the corresponding positions set of faulty word, enter corresponding error protection;
D () detects whether to exist under-voltage, if there is under-voltage, and the corresponding positions set of faulty word, enter corresponding error protection;
E () detects whether to there is short circuit, if there is short circuit, the corresponding positions set of faulty word, enter corresponding error protection;
F () often through the detection cycle that error protection is corresponding, detects the fault of the corresponding positions set of faulty word again, if having met recovery condition, then the corresponding positions of faulty word resets and exits corresponding error protection.
All of protection judges all to be realized by program interrupt; except detecting whether to there is reversal connection when power supply access device starts in flow chart; other are all without the restriction of sequencing, and once control is entered error protection by down trigger (i.e. detect and meet protective condition) controller.The only help of flow chart in Fig. 2 understands that schemes ranking, change order do not change technical scheme.
If there is crossing stream in step (a), carry out corresponding error protection and comprise the following steps:
(a1) if the overcurrent of energy-storage units, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses.
Specifically; the electric current of energy-storage units is detected by the current detection circuit of energy storage protected location; if electric current is more than or equal to setting electric current; the 150% of such as rated value; it was judged to stream; by disabling controller corresponds to the pulse-width signal of the pulse-width modulation circuit output of blower fan, photovoltaic module and energy-storage units, disconnect blower fan, photovoltaic module and energy-storage units and protect.
(a2) if load overcurrent, disconnect output gate-controlled switch and stop output.
Load current is detected by the current detection circuit of load protection unit, if electric current is more than or equal to setting the 150% of electric current, such as rated value, it is determined that for crossing stream, disconnects output gate-controlled switch and stops output;Output gate-controlled switch can use different types of gate-controlled switch, uses relay in the present embodiment.
(a3) if the input current of generator unit crosses stream, the pulse-width signal of disabling generator unit, stop generator unit and access.
Specifically; the input current of blower fan or photovoltaic module passes through blower fan input electric cur-rent measure circuit or the photovoltaic module input electric cur-rent measure electric circuit inspection of system protection unit; if the input current of blower fan or photovoltaic module is more than or equal to the 150% of rated value, it is determined that for crossing stream;By the pulse-width signal exported corresponding to the pulse-width modulation circuit of blower fan, photovoltaic module in disabling controller, stop blower fan or photovoltaic module accesses.
(a4) if dc bus crosses stream, disconnect output gate-controlled switch and stop output.
Dc bus is crossed to flow and is detected by the DC bus current testing circuit of system protection unit, if greater than or equal to the 150% of rated value, it is determined that for crossing stream;Disconnect output gate-controlled switch and stop output.
Often passing through the error protection detection cycle that stream is corresponding, such as 0.2 second, the protection object of stream was crossed in the existence of the corresponding positions set again detecting faulty word, if meeting the 105% of recovery condition, e.g., less than or equal to rated value, exits overcurrent protection.
If there is overload in step (b), carry out corresponding error protection and comprise the following steps:
(b1) if load overload, disconnect output gate-controlled switch and stop output.
By the load current detection circuit of load protection unit and load voltage testing circuit, it is thus achieved that load current and voltage, thus obtain bearing power, if bearing power is more than or equal to 1.6 times of setting value, such as rated value, it is determined that for overload;Disconnect output gate-controlled switch and stop output.
(b2) if generator unit overload, the pulse-width signal of disabling generator unit, stop generator unit and access;
Specifically, by the blower fan input electric cur-rent measure circuit of system protection unit and blower fan input voltage detection circuit, it is thus achieved that blower fan input current and voltage; thus obtain power of fan; if power of fan is more than or equal to 1.6 times of setting value, such as rated value, it is determined that for overload;Disabling blower fan or the pulse-width signal of photovoltaic module unit, stop blower fan or photovoltaic module accesses.
By the photovoltaic module input electric cur-rent measure circuit of system protection unit and photovoltaic module input voltage detection circuit; obtain photovoltaic module input current and voltage, thus obtain photovoltaic module power, if photovoltaic module power is more than or equal to setting value; 1.6 times of such as rated value, it is determined that for overload;Disabling photovoltaic module or the pulse-width signal of photovoltaic module unit, stop photovoltaic module or photovoltaic module accesses.
Often through the error protection detection cycle that overload is corresponding, such as 0.2 second, again detecting the protection object of the existence overload of the corresponding positions set of faulty word, if meeting the 110% of recovery condition, e.g., less than or equal to rated value, exiting overload protection.
If there is overvoltage in step (c), carry out corresponding error protection and comprise the following steps:
(c1) if the electric voltage over press of high direct voltage bus, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses, start unloader.
Specifically, the voltage of high direct voltage bus is detected by the direct current bus voltage detecting circuit of system protection unit, if greater than or equal to the 130% of setting value, such as rated value, it is determined that for overvoltage;Disabling blower fan, photovoltaic module and the pulse-width signal of energy-storage units, stop blower fan, photovoltaic module and energy-storage units and access, start unloader.
(c2) if generator unit input voltage is more than or equal to stopping voltage, the pulse-width signal of disabling generator unit, stop generator unit and access.
Blower fan or photovoltaic module input voltage are detected by blower fan input voltage detection circuit or the photovoltaic module input voltage detection circuit of system protection unit; if blower fan or photovoltaic module input voltage are more than or equal to stopping voltage; for example, the 130% of rated voltage, stops blower fan or photovoltaic module accesses.
Often through the error protection detection cycle that overvoltage is corresponding, such as 0.2 second, again detecting the protection object of the existence overvoltage of the corresponding positions set of faulty word, if meeting the 105% of recovery condition, e.g., less than or equal to rated value, exiting overvoltage protection.
If there is under-voltage in step (d), carry out corresponding error protection and comprise the following steps:
(d1) if generator unit input voltage is less than starting voltage, the pulse-width signal of disabling generator unit, stop generator unit and access.
Specifically; blower fan or photovoltaic module input voltage are detected by blower fan input voltage detection circuit or the photovoltaic module input voltage detection circuit of system protection unit; if blower fan or photovoltaic module input voltage are less than starting the 80% of voltage, such as rated value, it is determined that for under-voltage;Disabling blower fan or the pulse-width signal of photovoltaic module unit, stop blower fan or photovoltaic module accesses.
(d2) if dc bus is under-voltage, disconnect output gate-controlled switch and stop output.
DC bus-bar voltage is detected by the direct current bus voltage detecting circuit of system protection unit, if DC bus-bar voltage is less than the 80% of setting value, such as rated value, it is determined that for under-voltage;Disconnect output gate-controlled switch and stop output.
Often through overvoltage/undervoltage corresponding error protection detection cycle, such as 0.2 second, the protection object that the existence of the corresponding positions set again detecting faulty word is under-voltage, if meeting recovery condition, being greater than or equal to the 95% of rated voltage, exiting under-voltage protection.
If there is short circuit in step (e), carry out corresponding error protection and comprise the following steps:
(e1) if load short circuits, disconnect output gate-controlled switch and stop output.
Load short circuits is detected by the load short circuits detection module of load protection unit, if be detected that load short circuits, disconnects output gate-controlled switch and stops output.
(e2) if power supply access device short circuit, disabling generator unit and the pulse-width signal of energy-storage units, stop generator unit and energy-storage units accesses.
Specifically, power supply access device short circuit is detected by the short-circuit detecting module of system protection unit, if be detected that short-circuit, disabling blower fan, photovoltaic module and the pulse-width signal of energy-storage units, stop blower fan, photovoltaic module and energy-storage units and access.
Often through the overvoltage/undervoltage corresponding error protection detection cycle, such as 0.5 second, again detecting the protection object of the existence short circuit of the corresponding positions set of faulty word, if meeting recovery condition, exiting short-circuit protection.
The guard method of power supply access device is further comprising the steps of:
When () power supply access device starts g, detect whether to there is reversal connection, if there is reversal connection, disconnect respective channel, stop starting.
Step (g) detects whether to exist reversal connection, disconnects respective channel and comprise the following steps:
(g1) if photovoltaic module reversal connection, disconnect photovoltaic gate-controlled switch, and report to the police on photovoltaic alarm device;In the present embodiment, photovoltaic alarm device is photovoltaic trouble light;
(g2) if energy-storage units reversal connection, energy storage gate-controlled switch is disconnected;
(g3) if load reversal connection, disconnecting output gate-controlled switch and stop output, and report to the police on load alarm device, in the present embodiment, load alarm device is load faulty lamp.
In the present embodiment, in step (g2), energy storage gate-controlled switch is insulated gate bipolar transistor (InsulatedGateBipolarTransistor, IGBT).
The guard method of power supply access device is further comprising the steps of:
(h) detection energy-storage units voltage, if greater than or equal to be full of magnitude of voltage, stop charging.
Energy-storage units voltage is detected by the voltage detecting circuit of energy storage protected location, if greater than or equal to being full of magnitude of voltage, stop charging, energy-storage units can be disconnected by energy storage gate-controlled switch.
Often charge the detection cycle through energy-storage units, such as 0.5 second, detection energy-storage units voltage again, if less than or equal to recovering charging voltage value, recover charging, energy-storage units can be connected by energy storage gate-controlled switch.The guard method of power supply access device comprises the following steps:
(i) detection ambient wind velocity whether more than or equal to cut-out wind speed, if greater than or equal to cut-out wind speed, the corresponding positions set of faulty word, disconnect blower fan gate-controlled switch, and blower fan braked.
Ambient wind velocity is detected by the harvester of blower fan protected location, if greater than or equal to cut-out wind speed, it is determined that for needs braking protection, disconnect blower fan gate-controlled switch, and to blower fan braking.
Owing to wind speed is excessive, blower fan can not normal power generation, by blower fan gate-controlled switch disconnect blower fan, power supply access device control under, by other generator units, such as photovoltaic module and/or energy-storage units, do not affect the power supply of whole electric power system.
Additionally if blower fan breaks down, it is also possible to disconnect blower fan by blower fan gate-controlled switch, do not affect the power supply of whole electric power system.
Often through a blower fan braking performance test cycle, such as 30 seconds, again detect ambient wind velocity, if still greater than or equal to cut-out wind speed, keep error protection;If less than cut-out wind speed, the corresponding positions of faulty word resets, and closes blower fan gate-controlled switch, stops braking blower fan.
The guard method of power supply access device comprises the following steps:
J () detects whether to there is thunder and lightning, if there is thunder and lightning, enter lightning protection.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be in the protection domain being defined in the patent claims the most on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (20)

1. a power supply access device; for accessing generator unit and energy-storage units and powering to the load; it is characterized in that; described power supply access device includes controller and the commutator, DC converter and the inverter that are connected with described controller, and described power supply access device also includes generator unit protected location, energy storage protected location, load protection unit and the system protection unit being connected with described controller.
Power the most as claimed in claim 1 access device, it is characterised in that generator unit is one or more in blower fan, photovoltaic or diesel-driven generator.
Power the most as claimed in claim 2 access device, it is characterised in that corresponding to described generator unit, generator unit protected location is one or more in blower fan protected location, photovoltaic protected location or diesel-driven generator protected location.
Power the most as claimed in claim 3 access device; it is characterized in that; described blower fan protected location includes harvester, brake unit and blower fan gate-controlled switch; described harvester is used for gathering ambient wind velocity; described brake unit is for braking described blower fan, and described blower fan gate-controlled switch is used for being switched on or switched off described blower fan.
Power the most as claimed in claim 3 access device, it is characterised in that described photovoltaic protected location includes the photovoltaic gate-controlled switch for being switched on or switched off described photovoltaic module and photovoltaic alarm device.
Power the most as claimed in claim 1 access device; it is characterized in that; described energy storage protected location includes current detection circuit, voltage detecting circuit and energy storage gate-controlled switch; described current detection circuit is for detecting the electric current of energy-storage units; described voltage detecting circuit is for detecting the voltage of energy-storage units, and described energy storage gate-controlled switch is used for being switched on or switched off described energy-storage units.
Power the most as claimed in claim 1 access device; it is characterized in that; described load protection unit include load current detection circuit, load voltage testing circuit, load short circuits detection module, for be switched on or switched off described load load gate-controlled switch and load alarm device described in load current detection circuit for detecting load current; described load voltage testing circuit is used for detecting load voltage, and described load short circuits detection module is the most short-circuit for described load.
Power the most as claimed in claim 1 access device; it is characterized in that; described controller includes the pulse-width modulation circuit controlling described blower fan, described photovoltaic module and described energy-storage units respectively, and described system protection unit includes unloader, blower fan input electric cur-rent measure circuit, blower fan input voltage detection circuit, photovoltaic module input electric cur-rent measure circuit, photovoltaic module input voltage detection circuit, DC bus current testing circuit, direct current bus voltage detecting circuit and short-circuit detecting module.
Power the most as claimed in claim 8 access device, it is characterised in that described system protection unit also includes back discharge protected location and/or lightning protected unit.
10. the guard method of the power supply access device as described in claim 1-9, it is characterised in that the guard method of described power supply access device comprises the following steps:
A () detects whether to there is stream, if there is crossing stream, the corresponding positions set of faulty word, enter corresponding error protection;
B () detects whether to there is overload, if there is overload, the corresponding positions set of faulty word, enter corresponding error protection;
C () detects whether to there is overvoltage, if there is overvoltage, the corresponding positions set of faulty word, enter corresponding error protection;
D () detects whether to exist under-voltage, if there is under-voltage, and the corresponding positions set of faulty word, enter corresponding error protection;
E () detects whether to there is short circuit, if there is short circuit, the corresponding positions set of faulty word, enter corresponding error protection;
F () often through the detection cycle that corresponding error protection is corresponding, detects the fault of faulty word set again, if having met recovery condition, then the corresponding positions of faulty word resets and exits corresponding error protection.
The guard method of 11. access devices of powering as claimed in claim 10, it is characterised in that if there is crossing stream in step (a), carry out corresponding error protection and comprise the following steps:
(a1) if the overcurrent of energy-storage units, disabling generator unit and the pulse-width signal of energy-storage units, stop described generator unit and described energy-storage units accesses;
(a2) if load overcurrent, disconnect output gate-controlled switch and stop output;
(a3) if the input current of generator unit crosses stream, disable the pulse-width signal of described generator unit, stop described generator unit and access;
(a4) if dc bus crosses stream, disconnect output gate-controlled switch and stop output.
The guard method of 12. access devices of powering as claimed in claim 10, it is characterised in that if there is overload in step (b), carry out corresponding error protection and comprise the following steps:
(b1) if load overload, disconnect output gate-controlled switch and stop output;
(b2) if generator unit overload, disable the pulse-width signal of described generator unit, stop described generator unit and access.
The guard method of 13. access devices of powering as claimed in claim 10, it is characterised in that if there is overvoltage in step (c), carry out corresponding error protection and comprise the following steps:
(c1) if the electric voltage over press of high direct voltage bus, disabling generator unit and the pulse-width signal of energy-storage units, stop described generator unit and described energy-storage units accesses, start unloader;
(c2) if generator unit input voltage is more than or equal to stopping voltage, the pulse-width signal of disabling generator unit, stop described generator unit and access.
The guard method of 14. access devices of powering as claimed in claim 10, it is characterised in that if there is under-voltage in step (d), carry out corresponding error protection and comprise the following steps:
(d1) if generator unit input voltage is less than starting voltage, disable the pulse-width signal of described generator unit, stop described generator unit and access;
(d2) if dc bus is under-voltage, disconnect output gate-controlled switch and stop output.
The guard method of 15. access devices of powering as claimed in claim 10, it is characterised in that if there is short circuit in step (e), carry out corresponding error protection and comprise the following steps:
(e1) if load short circuits, disconnect output gate-controlled switch and stop output;
(e2) if described power supply access device is short-circuit, disabling generator unit and the pulse-width signal of energy-storage units, stop described generator unit and described energy-storage units accesses.
The guard method of 16. access devices of powering as claimed in claim 10, it is characterised in that the guard method of described power supply access device is further comprising the steps of:
When () power supply access device starts g, detect whether to there is reversal connection, if there is reversal connection, disconnect respective channel, stop starting.
The guard method of 17. access devices of powering as claimed in claim 16, it is characterised in that detect whether to exist reversal connection in step (g), disconnect respective channel and comprise the following steps:
(g1) if photovoltaic module reversal connection, disconnect photovoltaic gate-controlled switch, and report to the police on photovoltaic alarm device;
(g2) if energy-storage units reversal connection, energy storage gate-controlled switch is disconnected;
(g3) if load reversal connection, disconnect output gate-controlled switch and stop output, and report to the police on load alarm device.
The guard method of 18. access devices of powering as claimed in claim 10, it is characterised in that the guard method of described power supply access device is further comprising the steps of:
(h) detection energy-storage units voltage, if greater than or equal to be full of magnitude of voltage, stop charging;Often charge the detection cycle through energy-storage units, again detection energy-storage units voltage, if less than or equal to recovering charging voltage value, recover charging.
The guard method of 19. access devices of powering as claimed in claim 10, it is characterised in that the guard method of described power supply access device is further comprising the steps of:
(i) detection ambient wind velocity whether more than or equal to cut-out wind speed, if greater than or equal to cut-out wind speed, the corresponding positions set of faulty word, disconnect blower fan gate-controlled switch, and blower fan braked;Often through a blower fan braking performance test cycle, again detect ambient wind velocity, if greater than or equal to cut-out wind speed, keep error protection;If less than cut-out wind speed, the corresponding positions of faulty word resets, and closes blower fan gate-controlled switch, stops braking blower fan.
The guard method of 20. access devices of powering as claimed in claim 10, it is characterised in that the guard method of described power supply access device is further comprising the steps of:
J () detects whether to there is thunder and lightning, if there is thunder and lightning, enter lightning protection.
CN201610343639.9A 2016-05-20 2016-05-20 Power supply access device and protection method thereof CN105826952A (en)

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Application publication date: 20160803