CN103855722A - Micro-grid connection device - Google Patents
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- CN103855722A CN103855722A CN201410114404.3A CN201410114404A CN103855722A CN 103855722 A CN103855722 A CN 103855722A CN 201410114404 A CN201410114404 A CN 201410114404A CN 103855722 A CN103855722 A CN 103855722A
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Abstract
The invention discloses a micro-grid connection device. The device comprises a controllable switch, a signal acquisition circuit and a controller, wherein the controllable switch is electrically connected between a micro-grid and a large power grid and is used for connecting or disconnecting the micro-grid and the large power grid according to an on-off signal, the signal acquisition circuit is used for colleting electric signals of the micro-grid, the large power grid and the controllable switch, the controller is electrically connected between the signal acquisition circuit and the controllable switch, is used for generating the on-off signal according to the electric signals of the micro-grid, the large power grid and the controllable switch, and can control on and off of the controllable switch so as to realize connection and disconnection of the micro-grids. The micro-grid connection device has a simple structure, is convenient to wire, can efficiently, reliably and rapidly switch between connection and disconnection of the micro-grids, and can effectively guarantee the safety of maintenance workers and the security of electric equipment of the micro-grid and the large power grid.
Description
Technical field
The present invention relates to distributed generation technology field, specifically, relate to a kind of micro-electrical network grid-connecting apparatus.
Background technology
The energy and environmental problem are the key factor of tie society sustainable economic development, current, and the fossil energies such as coal, oil occupy larger specific gravity in global energy structure.In the face of the dual-pressure of energy crisis and environmental protection, new forms of energy have obtained develop and useining more and more widely.
In recent years, the generations of electricity by new energy such as photovoltaic, wind-force shared ratio in traditional net capacity constantly increases, and estimates that the year two thousand twenty world photovoltaic generation total amount will account for 1% of world's total energy demand, and the year two thousand fifty will account for 20%.But along with the development of generation of electricity by new energy, these new forms of energy also highlight the impact of large electrical network day by day as the fluctuation of the random energy.
Micro-electrical network utilize form as a kind of new energy source tissue, when new forms of energy such as solving photovoltaic generation access problem on a large scale, has also avoided impact and the impact of its fluctuation on large electrical network, is to realize the grid-connected effective way of the contour infiltration of photovoltaic generation.Under the overall background of China's construction " resource-conserving, environmentally friendly " society, the research of micro-electrical network and applying has great importance.
Micro-electrical network is developed by distributed generation technology, to take distributed power generation unit as main, close decentralized resource or user's small-sized supply network, it is one of key technology realizing in the large electrical network of the level and smooth access of the batch (-type) energy, can realize the coordinated operation of distributed power source and load, meet the many-sided requirement of user to power supply reliability, the quality of power supply.At present, the realization of PCC switch quick-switching function when micro-electrical network points of common connection (Point of Common Coupling, referred to as PCC) switch is mostly all just absorbed in micro-electrical network and switches from network operation pattern, intelligent degree is not high.In addition controller and Switch main body adopt design separately and independent wiring to install, wiring complexity, and system cost is high, and floor space is large and level of integrated system is not high.
Micro-electrical network is connected by points of common connection and outside large electrical network, and the energy of points of common connection can two-way flow, self is realized the energy balance control of micro-electrical network by the large electrical network in outside or micro-electrical network.It is grid-connected and from two kinds of running statuses of net that micro-electrical network has, being incorporated into the power networks of micro-electrical network refers under normal circumstances, micro-electrical network is connected and can moves simultaneously with large electrical network, and micro-electrical network provides unnecessary electric energy or the insufficient section by the supplementary micro-grid generation of large electrical network to large electrical network; Refer to and break down or when the quality of power supply can not meet relevant criterion and requires, micro-electrical network disconnects the independent operating with large being connected of electrical network, thereby ensures the high-quality of micro-electrical network internal loading to power when large electrical network from network operation.At present, in order to ensure the normal work of China's distribution protection device, do not obtain the license of power department; micro-electrical network must not be to large electrical network transmission of electric energy; micro-electrical network is as grid-connected in need, set up reverse current protection device at points of common connection place, and therefore the monitoring of points of common connection and control seem important more.
Based on above-mentioned situation, need badly a kind of simple in structure, can reliably realize the grid-connected of micro-electrical network with from net switch micro-electrical network grid-connecting apparatus.
Summary of the invention
For addressing the above problem, the invention provides a kind of micro-electrical network grid-connecting apparatus, described device comprises:
Gate-controlled switch, it is electrically connected between described micro-electrical network and large electrical network, for according to make-and-break signal conducting or disconnect described micro-electrical network and large electrical network between connection;
Signal acquisition circuit, it is for gathering the signal of telecommunication of micro-electrical network, large electrical network and gate-controlled switch;
Controller, it is electrically connected between described signal acquisition circuit and gate-controlled switch, for producing make-and-break signal according to the signal of telecommunication of described micro-electrical network, large electrical network and gate-controlled switch, to control the break-make of described gate-controlled switch, thereby realize the grid-connected of described micro-electrical network or from net.
According to one embodiment of present invention, described signal acquisition circuit comprises:
Micro-electrical network signal acquisition circuit, it is for gathering the voltage of described micro-electrical network;
Large electrical network signal acquisition circuit, it is for gathering the voltage of described large electrical network;
Gate-controlled switch signal acquisition circuit, it crosses the electric current of described gate-controlled switch for acquisition stream.
According to one embodiment of present invention,
When described micro-electrical network in and when net state,
Described controller calculates respectively effective value, harmonic component, frequency and the phase place of the voltage of described micro-electrical network and large electrical network, and effective value and the harmonic component of the electric current of described gate-controlled switch are flow through in calculating, and judge that based on result of calculation whether large electrical network is abnormal, if large electrical network is abnormal, described controller produces cut-off signal, disconnect to control described gate-controlled switch, thus realize described micro-electrical network from net;
When described micro-electrical network is when from net state,
Described controller calculates respectively effective value, harmonic component, frequency and the phase place of the voltage of described micro-electrical network and large electrical network, and result of calculation is sent to micro-grid control centre, for carrying out micro-electrical network, described micro-grid control centre provides data with large synchronizeing of electrical network, whether the result of calculation that described controller judges described micro-electrical network mates with the result of calculation of described large electrical network, if coupling, produce gate-controlled switch closure described in Continuity signal control, thereby realize the grid-connected of described micro-electrical network.
According to one embodiment of present invention, when described micro-electrical network in and when net state,
Described controller judges respectively whether the effective value of the voltage of the large electrical network calculating exceedes default overvoltage limit value or whether exceed default overfrequency limit value or whether exceed predeterminated voltage harmonic limits lower than the harmonic component of default under-frequency limit value, voltage lower than the frequency of default under-voltage limit value, voltage, if arbitrary condition being detected in default lasting duration sets up, judge that described large electrical network is abnormal, described micro-electrical network generation island effect.
According to one embodiment of present invention, when described micro-electrical network in and when net state,
Described controller judges whether the effective value of the electric current that flows through described gate-controlled switch calculating exceedes default adverse current limit value, if this condition being detected in default lasting duration sets up, judge described micro-electrical network generation adverse current, described controller produces cut-off signal, disconnect to control described gate-controlled switch, thus realize described micro-electrical network from net.
According to one embodiment of present invention, when described micro-electrical network is when from net state,
The voltage of described controller based on described micro-electrical network and large electrical network calculates effective value difference, frequency-splitting and the phase difference value of the voltage of described large electrical network and micro-electrical network, and judge respectively whether each difference is less than corresponding predetermined threshold value, if be less than, judge that the result of calculation of described micro-electrical network and the result of calculation of described large electrical network mates, otherwise judgement is not mated.
According to one embodiment of present invention,
When described micro-electrical network in and when net state,
Described controller according to the harmonic component of the voltage of described micro-electrical network and large electrical network, flow through the harmonic component of the electric current of described gate-controlled switch, judge the quality of power supply at described points of common connection place;
When described micro-electrical network is when from net state,
Described controller, according to the harmonic component of the voltage of described micro-electrical network and large electrical network, judges the quality of power supply at described points of common connection place.
According to one embodiment of present invention, described device also comprises data communication units, and it is connected with described controller, for realizing the data communication between described controller and micro-grid control centre.
According to one embodiment of present invention, described device also comprises power module, and it is connected with described controller, is used to described controller that power supply is provided, wherein,
When described micro-electrical network in and when net state, described power module is from described large electrical network power taking, when described micro-electrical network is when from net state, described power module is from described micro-electrical network power taking.
According to one embodiment of present invention, each part of described device is all integrated in same casing, and described casing is arranged on the points of common connection place of described micro-electrical network and large electrical network.
Compared to existing micro-electrical network grid-connecting apparatus, micro-electrical network grid-connecting apparatus provided by the invention is arranged on micro-electrical network and locates with the grid-connected position (being points of common connection) of large electrical network, it integrates controls function and switching function, and the space that whole device is taken diminishes, its wiring is also convenient.Simultaneously; this device is realized the functions such as the isolated island detection of micro-electrical network and protection, counterflow-preventing protection, relaying protection, accurate simultaneous interconnecting according to the signal of telecommunication at micro-electrical network, large electrical network and gate-controlled switch place; improved micro-electrical network from net state and and net state between carry out the reliability switched fast, for the safe operation of power consumption equipment in micro-electrical network and large electrical network provides guarantee.
Micro-electrical network grid-connecting apparatus provided by the invention is as a part for micro-grid control system, for the vital effect of having played of giving full play to of the safe and stable operation of whole micro-grid system and micro-electrical network function.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in specification, claims and accompanying drawing.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, will do simple introduction to needed accompanying drawing in embodiment or description of the Prior Art below:
Fig. 1 is the structure chart of micro-electrical network grid-connecting apparatus according to an embodiment of the invention.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical problem whereby, and the implementation procedure of reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each feature in each embodiment and each embodiment in the present invention can mutually combine, and the technical scheme forming is all within protection scope of the present invention.
Fig. 1 shows the structure chart of micro-electrical network grid-connecting apparatus in the present embodiment.
As shown in Figure 1, micro-electrical network grid-connecting apparatus comprises gate-controlled switch 101, signal acquisition circuit 102, signaling conversion circuit 103, controller 104 and switch driving circuit 105.In the present embodiment, each part of micro-electrical network grid-connecting apparatus is all integrated in same casing, and this casing is arranged on micro-electrical network and locates with the grid-connected position (being points of common connection) of large electrical network.Like this compared to existing grid-connecting apparatus, the shared space of the grid-connecting apparatus that provides in the present embodiment is less, its wiring is also convenient.
In the present embodiment, signal acquisition circuit 102 comprises micro-electrical network signal acquisition circuit 102a, large electrical network signal acquisition circuit 102b and gate-controlled switch signal acquisition circuit 102c.Wherein, micro-electrical network signal acquisition circuit 102a is connected with micro-electrical network, for gathering the voltage of micro-electrical network; Large electrical network signal acquisition circuit 102b is connected with large electrical network, for gathering the voltage of electrical network; Gate-controlled switch signal acquisition circuit 102c is connected with gate-controlled switch 101, crosses the electric current of gate-controlled switch 101 for acquisition stream.
In order to make make-and-break signal that controller 104 is exported can meet the semaphore request of gate-controlled switch 101, in the present embodiment, between controller 104 and gate-controlled switch 101, be electrically connected with switch driving circuit 105.The make-and-break signal that switch driving circuit 105 can be exported controller 104 carries out corresponding electric weight conversion, makes the make-and-break signal after conversion can meet the requirement of gate-controlled switch 101, thereby makes controller 104 can reliably control the break-make of gate-controlled switch 101.Make so micro-electrical network from net state and and net state between switching also more reliable, improved the availability of whole device.
Gate-controlled switch 101 is connected electrically between micro-electrical network and large electrical network, and its make-and-break signal sending according to the controller 104 receiving is correspondingly closed or disconnect, thus realize the grid-connected of micro-electrical network with from net.In the present embodiment, gate-controlled switch 101 preferably adopts quick acting device architecture, but the invention is not restricted to this.By adopting quick acting device architecture, ensure the make-and-break signal that gate-controlled switch 101 can fast-response control device 104 be exported, and can reliable deciliter.Ensured like this this device can realize micro-electrical network and net state and between net state fast, reliably switch.
In the present embodiment, micro-electrical network grid-connecting apparatus also comprises power module 106.Power module 106 is used to each part in device that power supply is provided, and it adopts duplicate supply framework.When micro-electrical network is when from net state, power module 106 is directly from micro-electrical network power taking; When micro-electrical network in and when net state, power module 106 is from large electrical network power taking.So in the time that large electrical network breaks down, micro-electrical network grid-connecting apparatus that the present embodiment provides still can normally be worked, thereby make the also net state and from the switching of net state more reliable of micro-electrical network grid-connecting apparatus to micro-electrical network.
Again as shown in Figure 1, in the present embodiment, micro-electrical network grid-connecting apparatus also comprises man-machine interaction unit 107 and data communication units 108.Man-machine interaction unit 107 is connected with controller 104, and it also for responding artificial Protection parameters setting, switch motion instruction etc., thereby realizes two-way man-machine interaction for showing the information such as running status, parameters of electric power of micro-electrical network.In the present embodiment, man-machine interaction unit 107 adopts touch display screen, for showing and obtaining relevant information, but the invention is not restricted to this.
Below taking micro-electrical network respectively in the state of being incorporated into the power networks with from Running State as example, come object to micro-electrical network grid-connecting apparatus provided by the invention, principle and advantage and do to set forth further.
In the time that micro-electrical network is incorporated into the power networks state, micro-electrical network is connected and operation simultaneously with large electrical network, and micro-electrical network provides unnecessary electric energy or the insufficient section by the supplementary micro-grid generation of large electrical network to large electrical network.
Now, micro-electrical network signal acquisition circuit 102a and large electrical network signal acquisition circuit 102b gather respectively the voltage of micro-electrical network and large electrical network, and gate-controlled switch signal acquisition circuit 102c acquisition stream is crossed the electric current of gate-controlled switch 101 simultaneously.
The signal of telecommunication that signaling conversion circuit 103 collects signal acquisition circuit 102 is transferred to controller 104 after changing accordingly, carry out further analyzing and processing use for controller 104.
In the time that large electrical network quits work because of reasons such as fault or power failure maintenances, for example, fail to detect power down mode if be arranged on micro-electrical network (grid-connected photovoltaic system) of each user side, this will cause micro-electrical network can not rapidly self be cut off to large electrical network, thereby cause by micro-electrical network load supplying towards periphery.This phenomenon is also referred to as island effect, and micro-electrical network just can be regarded an isolated island as.
Once isolated island produces, by the safety of maintenance personal and power consumption equipment on large entail dangers to grid power transmission circuit.Island effect also can affect the operation program of protection switch in distribution system simultaneously, impacts electric network protection device; Island effect can have a negative impact to the quality of power supply of transmission, and the supply power voltage in electric power isolated island region and frequency are by unstable.After large mains supply recovers, island effect also can cause micro-electrical network asynchronous with the power supply of large electrical network.If micro-electrical network is single-phase distributed generation system, island effect also can cause the threephase load of large mains supply system to owe to power mutually.Therefore,, for micro-electrical network grid-connected system, must carry out isolated island detection and protection.
In the present embodiment, controller 104, according to the voltage of the large electrical network receiving, calculates respectively effective value, harmonic component, frequency values and the phase value of large line voltage.Subsequently, controller 104 judges respectively whether the effective value of the voltage of the large electrical network calculating exceedes default overvoltage limit value or whether exceed default overfrequency limit value or whether exceed predeterminated voltage harmonic limits lower than the harmonic component of default under-frequency limit value, voltage lower than the frequency of default under-voltage limit value, voltage.If detect and above-mentioned arbitrary condition establishment judge micro-electrical network generation island effect in duration default continuing.Controller 104 produces cut-off signal, controls gate-controlled switch 101 and disconnects, realize micro-electrical network from net, thereby ensure the safety of maintenance personal and power consumption equipment on large grid power transmission circuit.
In addition, controller 104, also according to the electric current that flows through gate-controlled switch 101 receiving, calculates effective value and the harmonic component of this electric current, and judges whether the effective value of the electric current that flows through gate-controlled switch exceedes default adverse current limit value.If detect and this condition establishment judge now micro-electrical network generation adverse current in duration default continuing.Controller 104 produces and exports cut-off signal, disconnect to control gate-controlled switch 101, thereby realize micro-electrical network from net.
When described micro-electrical network is when from net state, the gate-controlled switch 101 between micro-electrical network and large electrical network is in off-state.Now, micro-electrical network signal acquisition circuit 102a and large electrical network signal acquisition circuit 102b gather respectively each phase voltage of micro-electrical network and large electrical network.
The condition of accurate simultaneous interconnecting is the voltage of micro-electrical network and the voltage effective value of large electrical network equates, phase place is identical and frequency equates.When above-mentioned condition is not satisfied and carries out when grid-connected, can causing impulse current.The difference of voltage is larger, and impulse current is just larger; The difference of frequency is larger, and the cycle of impulse current is shorter.And impulse current is all disadvantageous to micro-electrical network and large electrical network.
So in the present embodiment, controller 104 will send to micro-grid control centre according to micro-line voltage and the result that large line voltage calculates by data communication units 108.Micro-grid control centre is realized micro-electrical network and synchronizeing of electrical network greatly according to the distributed power generation unit in the micro-electrical network of result of calculation control receiving.Whether controller 104 in real time more micro-electrical network is less than corresponding predetermined threshold value with voltage effective value difference, frequency-splitting and the phase difference value of large electrical network, detects and catch the suitable grid-connected moment with this.
If voltage effective value difference, frequency-splitting and phase difference value are all less than corresponding predetermined threshold value, controller 104 will judge that now the result of calculation of micro-electrical network is mated with the result of calculation of large electrical network so, and micro-electrical network and large electrical network are in plesiochronous mode.
When controller 104 monitor micro-electrical network with large electrical network after plesiochronous mode, controller 104 is exported Continuity signal, control switch unit 101 closures make micro-electrical network by switching to fast from net state and net state, thereby realize the accurate simultaneous interconnecting of micro-electrical network.In the present embodiment, in the time that micro-electrical network is less than corresponding difference threshold respectively with voltage effective value difference, frequency-splitting and the phase difference value of large electrical network, controller 104 judges that micro-electrical network synchronizes with electrical network greatly.
In addition,, because power load is different in micro-electrical network, this just requires the power supply that micro-electrical network provides can meet the diversified quality of power supply demand of power load.Micro-electrical network and the points of common connection of large electrical network are connected the key position of large electrical network as micro-electrical network, can the quality of power supply at this place meet and network electric energy quality to require be the key that can the micro-electrical network internal loading of relation reliable power supply.Therefore, the quality of power supply at points of common connection place is carried out to Real-Time Monitoring and seem particularly important.
In the present embodiment, the controller 104 respectively voltage signal to the large grid side receiving and micro-grid side and the current signal that flows through gate-controlled switch carries out orthogonal wavelet decomposition, analyze respectively the decomposition result of each yardstick in each signal, thereby detect each harmonic component in each signal.
In addition, though micro-electrical network in which kind of running status, the quality of power supply information (comprising electric current, voltage each harmonic data message) that micro-electrical network grid-connecting apparatus that the present embodiment provides can both Real-Time Monitoring points of common connection place.
When micro-electrical network in and when net state, controller 104 according to the harmonic component of the voltage of micro-electrical network and large electrical network, flow through the harmonic component of the electric current of gate-controlled switch 101, judge the quality of power supply at points of common connection place.
When micro-electrical network is when from net state, controller 104, according to the harmonic component of the voltage of micro-electrical network and large electrical network, judges the quality of power supply at points of common connection place.
Harmonic wave testing result, except analyzing judgement for controller 104, can also show in real time by man-machine interface, thereby meet the daily monitoring requirements of the points of common connection place quality of power supply.The quality of power supply information that monitoring obtains both can be analyzed micro-operation of power networks state for related personnel by device man-machine interface, also can upload in micro-grid control centre through communication processing unit.
Micro-electrical network grid-connecting apparatus provided by the invention is arranged on micro-electrical network and locates with the grid-connected position (being points of common connection) of large electrical network, and it integrates controls function and switching function, and the space that whole device is taken diminishes, its wiring is also convenient.Simultaneously; this device is realized the functions such as the isolated island detection of micro-electrical network and protection, counterflow-preventing protection, relaying protection, accurate simultaneous interconnecting according to the signal of telecommunication at micro-electrical network, large electrical network and gate-controlled switch place; improved micro-electrical network from net state and and net state between carry out the reliability switched fast, for the safe operation of power consumption equipment in micro-electrical network and large electrical network provides guarantee.
Meanwhile, micro-electrical network grid-connecting apparatus provided by the invention can also be served as the part of micro-grid control system, can meet the control requirement of different micro-electrical networks from other devices in micro-grid control system after carrying out modular arrangements.This shows that micro-electrical network grid-connecting apparatus provided by the invention can be good at being used in conjunction with other devices, compared to existing grid-connecting apparatus, its have higher can integrated level, giving full play to of this safe and stable operation for whole micro-grid system and micro-electrical network function will be played important effect.
Although the disclosed execution mode of the present invention as above, the execution mode that described content just adopts for the ease of understanding the present invention, not in order to limit the present invention.Technical staff in any the technical field of the invention; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can do any amendment and variation what implement in form and in details; but scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims was defined.
Claims (10)
1. a micro-electrical network grid-connecting apparatus, is characterized in that, described device comprises:
Gate-controlled switch, it is electrically connected between described micro-electrical network and large electrical network, for according to make-and-break signal conducting or disconnect described micro-electrical network and large electrical network between connection;
Signal acquisition circuit, it is for gathering the signal of telecommunication of micro-electrical network, large electrical network and gate-controlled switch;
Controller, it is electrically connected between described signal acquisition circuit and gate-controlled switch, for producing make-and-break signal according to the signal of telecommunication of described micro-electrical network, large electrical network and gate-controlled switch, to control the break-make of described gate-controlled switch, thereby realize the grid-connected of described micro-electrical network or from net.
2. device as claimed in claim 1, is characterized in that, described signal acquisition circuit comprises:
Micro-electrical network signal acquisition circuit, it is for gathering the voltage of described micro-electrical network;
Large electrical network signal acquisition circuit, it is for gathering the voltage of described large electrical network;
Gate-controlled switch signal acquisition circuit, it crosses the electric current of described gate-controlled switch for acquisition stream.
3. device as claimed in claim 2, is characterized in that,
When described micro-electrical network in and when net state,
Described controller calculates respectively effective value, harmonic component, frequency and the phase place of the voltage of described micro-electrical network and large electrical network, and effective value and the harmonic component of the electric current of described gate-controlled switch are flow through in calculating, and judge that based on result of calculation whether large electrical network is abnormal, if large electrical network is abnormal, described controller produces cut-off signal, disconnect to control described gate-controlled switch, thus realize described micro-electrical network from net;
When described micro-electrical network is when from net state,
Described controller calculates respectively effective value, harmonic component, frequency and the phase place of the voltage of described micro-electrical network and large electrical network, and result of calculation is sent to micro-grid control centre, for carrying out micro-electrical network, described micro-grid control centre provides data with large synchronizeing of electrical network, whether the result of calculation that described controller judges described micro-electrical network mates with the result of calculation of described large electrical network, if coupling, produce gate-controlled switch closure described in Continuity signal control, thereby realize the grid-connected of described micro-electrical network.
4. device as claimed in claim 3, is characterized in that, when described micro-electrical network in and when net state,
Described controller judges respectively whether the effective value of the voltage of the large electrical network calculating exceedes default overvoltage limit value or whether exceed predeterminated frequency limit value or whether exceed predeterminated voltage harmonic limits lower than the harmonic component of default under-frequency limit value, voltage lower than the frequency of default under-voltage limit value, voltage, if arbitrary condition being detected in default lasting duration sets up, judge that described large electrical network is abnormal, described micro-electrical network generation island effect.
5. the device as described in claim 3 or 4, is characterized in that, when described micro-electrical network in and when net state,
Described controller judges whether the effective value of the electric current that flows through described gate-controlled switch calculating exceedes default adverse current limit value, if this condition being detected in default lasting duration sets up, judge described micro-electrical network generation adverse current, described controller produces cut-off signal, disconnect to control described gate-controlled switch, thus realize described micro-electrical network from net.
6. the device as described in any one in claim 3～5, is characterized in that, when described micro-electrical network is when from net state,
The voltage of described controller based on described micro-electrical network and large electrical network calculates effective value difference, frequency-splitting and the phase difference value of the voltage of described large electrical network and micro-electrical network, and judge respectively whether each difference is less than corresponding predetermined threshold value, if be less than, judge that the result of calculation of described micro-electrical network and the result of calculation of described large electrical network mates, otherwise judgement is not mated.
7. the device as described in any one in claim 3～6, is characterized in that,
When described micro-electrical network in and when net state,
Described controller according to the harmonic component of the voltage of described micro-electrical network and large electrical network, flow through the harmonic component of the electric current of described gate-controlled switch, judge the quality of power supply at described points of common connection place;
When described micro-electrical network is when from net state,
Described controller, according to the harmonic component of the voltage of described micro-electrical network and large electrical network, judges the quality of power supply at described points of common connection place.
8. the device as described in any one in claim 1～7, is characterized in that, described device also comprises data communication units, and it is connected with described controller, for realizing the data communication between described controller and micro-grid control centre.
9. the device as described in any one in claim 1～8, is characterized in that, described device also comprises power module, and it is connected with described controller, is used to described controller that power supply is provided, wherein,
When described micro-electrical network in and when net state, described power module is from described large electrical network power taking, when described micro-electrical network is when from net state, described power module is from described micro-electrical network power taking.
10. the device as described in any one in claim 1～9, is characterized in that, each part of described device is all integrated in same casing, and described casing is arranged on the points of common connection place of described micro-electrical network and large electrical network.
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| CN104166387A (en) * | 2014-07-10 | 2014-11-26 | 国家电网公司 | Distributed photovoltaic grid-connected generation monitoring system power consumption measurement apparatus |
| CN104578163A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Switch combination for quick disconnection and connection of micro grid supply points and control method |
| CN105098782A (en) * | 2014-12-24 | 2015-11-25 | 上海电气集团股份有限公司 | Intelligent micro-grid switching and protection device and system |
| CN105762830A (en) * | 2014-12-16 | 2016-07-13 | 中国科学院沈阳自动化研究所 | Intelligent grid disconnection/connection switch with detection function, and implementation method therefor |
| CN107508325A (en) * | 2017-07-25 | 2017-12-22 | 中国农业大学 | For multiple distributed power sources and off-grid synchronisation control means |
| CN113098060A (en) * | 2021-04-08 | 2021-07-09 | 河北工业大学 | Intelligent controllable power switch for new energy grid connection |
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| CN104578163A (en) * | 2015-01-29 | 2015-04-29 | 国家电网公司 | Switch combination for quick disconnection and connection of micro grid supply points and control method |
| CN104578163B (en) * | 2015-01-29 | 2017-03-08 | 国家电网公司 | A kind of switch combination for the quick division of micro-grid connection point and control method |
| CN107508325A (en) * | 2017-07-25 | 2017-12-22 | 中国农业大学 | For multiple distributed power sources and off-grid synchronisation control means |
| CN113098060A (en) * | 2021-04-08 | 2021-07-09 | 河北工业大学 | Intelligent controllable power switch for new energy grid connection |
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