CN102403735A - Method and system for switching microgrid between island mode and grid connected mode - Google Patents
Method and system for switching microgrid between island mode and grid connected mode Download PDFInfo
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Abstract
The invention, belonging to the field of dispatching and management of a distribution network, provides a method and system for switching a microgrid between an island mode and a grid connected mode. When an external electric network has a fault, distributed power in a microgrid system is cut off, a grid connected contact breaker of the microgrid system and the external electric network is opened, a voltage and a frequency of the microgrid system are regenerated by a main power switching control mode in the microgrid system, and the microgrid system works independently; and when the external electric network returns to normal, if the electric network side voltage of the grid connected contact breaker is monitored to be normal and is lasted for a certain time, operations of a fan, a photovoltaic power generation system and an energy storage system of a storage battery are stopped, the grid connected contact breaker of the microgrid system is closed, a load is powered with the external electric network, the devices such as the fan and the like are reconnected to the grid for operation, so that a stable operation of the microgrid system in a transient state process of switching between the island mode and the grid connected mode is satisfied, the transient time is shortened, and the requirements of the microgrid system in safety, reliability and quick response are satisfied. The method and system have the characteristics of quickness, stability and reliability.
Description
Technical field
The invention belongs to power distribution network scheduling and management domain, relate in particular to a kind of microgrid that is used at isolated island and the method and system that are incorporated into the power networks and switch between the pattern.
Background technology
The microgrid system when power outage appears in big electrical network, needs to switch to the islet operation pattern rapidly from big grid disconnection under the pattern of being incorporated into the power networks, and guarantees the reliable power supply of microgrid load; Under the islet operation pattern, after big power system restoration is normal, should switch to the pattern of being incorporated into the power networks rapidly.
There is irrationality in existing microgrid system at the isolated island and the mutual switching of being incorporated into the power networks between the pattern, and longer like switching time, intermittent outage can appear in load, is difficult to satisfy that the microgrid system safety is reliable, the rapid-action requirement.
Summary of the invention
The invention provides a kind of microgrid that is used at isolated island and the method and system that are incorporated into the power networks and switch between the pattern; Be intended to solve microgrid system that prior art provides and have irrationality at the isolated island and the mutual switching of being incorporated into the power networks between the pattern; Switching time is longer; Intermittent outage can appear in load, is difficult to satisfy that the microgrid system safety is reliable, the problem of fast reaction requirement.
The object of the present invention is to provide a kind of microgrid that is used at isolated island and the method that is incorporated into the power networks and switches between the pattern, this method may further comprise the steps:
Set the microgrid system and reach by the threshold voltage U2 of isolated island pattern, and threshold voltage U1 is less than threshold voltage U2 to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch;
The external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
According to the relation of external electrical network voltage U 3, realize the microgrid system is carried out the isolated island pattern and the switching of the pattern that is incorporated into the power networks with threshold voltage U1, threshold voltage U2.
Another object of the present invention is to provide a kind of microgrid that is used at isolated island and the system that is incorporated into the power networks and switches between the pattern, this system comprises:
The threshold voltage settings module is used to set the microgrid system and is reached by the threshold voltage U2 of isolated island pattern to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch, and threshold voltage U1 is less than threshold voltage U2;
The line voltage monitoring modular is used for the external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
Mode switch module is used for according to the relation of external electrical network voltage U 3 with threshold voltage U1, threshold voltage U2, realizes the microgrid system is carried out the isolated island pattern and the switching of the pattern that is incorporated into the power networks.
The microgrid that is used for provided by the invention is at isolated island and the method and system that are incorporated into the power networks and switch between the pattern, and when the external electrical network fault, the intrasystem distributed power source of microgrid at first cuts off the power supply; Open the network interconnecting circuit that is incorporated into the power networks of microgrid system and external electrical network then, microgrid system internal loading has a power failure in short-term, after confirming that microgrid system and the outside network interconnecting circuit that is incorporated into the power networks are opened; Main power source switching controls pattern in the microgrid system rebulids the voltage and the frequency of microgrid system, microgrid system independent operating; It is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from independent operating; After external electrical network is recovered normally, if after monitoring the normal also certain time of the network interconnecting circuit grid side voltage that is incorporated into the power networks, stop blower fan, photovoltaic generating system and the operation of batteries to store energy system simultaneously; Microgrid system internal loading dead electricity; Assign the network interconnecting circuit that the closed microgrid of instruction system is incorporated into the power networks then, load is by the external electrical network power supply, after the network interconnecting circuit closure that the microgrid system is incorporated into the power networks; Blower fan, photovoltaic generating system and batteries to store energy system are incorporated into the power networks again; Satisfied the stable operation of microgrid system in the transient process of isolated island, the mode switch that is incorporated into the power networks, reduced transient state transit time effectively, satisfied that the microgrid system safety is reliable, the rapid-action requirement; Improved the controllability of microgrid system in the mode switch process, quick, stable, the reliable characteristics that have.
Description of drawings
Fig. 1 be the embodiment of the invention provide be used for microgrid at isolated island and the method switched between the pattern of being incorporated into the power networks flow chart;
Fig. 2 is that the microgrid system that provides of the embodiment of the invention is by the flow chart of the pattern of being incorporated into the power networks to the implementation method of isolated island mode switch;
Fig. 3 is that the microgrid system that provides of the embodiment of the invention is by the flow chart of isolated island pattern to the implementation method of the mode switch that is incorporated into the power networks;
Fig. 4 be the embodiment of the invention provide be used for microgrid at isolated island and the structured flowchart of the system switched between the pattern of being incorporated into the power networks.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further specified below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in the qualification invention.
Fig. 1 shows that the embodiment of the invention provides is used for microgrid at isolated island and the realization flow of the method switched between the pattern of being incorporated into the power networks.
This method may further comprise the steps:
In step S101, set the microgrid system and reach by the threshold voltage U2 of isolated island pattern, and threshold voltage U1 is less than threshold voltage U2 to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch;
In step S102, the external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
In step S103,, realize the microgrid system is carried out the isolated island pattern and the switching of the pattern that is incorporated into the power networks according to the relation of external electrical network voltage U 3 with threshold voltage U1, threshold voltage U2.
As shown in Figure 2, in embodiments of the present invention, the microgrid system by the pattern of being incorporated into the power networks to the implementation method of isolated island mode switch is:
In step S201,, open the network interconnecting circuit between microgrid system and the external electrical network when external electrical network voltage U 3 during less than threshold voltage U1;
In step S202, blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work, and open the load loop circuit breaker simultaneously, and the disconnection load is connected with the microgrid system;
In step S203, convert the batteries to store energy system into the isolated island pattern;
In step S204, the closed load circuit breaker, the foundation load is connected with the microgrid system;
In step S205, blower fan, photovoltaic generating system are incorporated the microgrid system again into and are generated electricity.
As shown in Figure 3, in the present invention can embodiment, the microgrid system by the isolated island pattern to the implementation method of the mode switch that is incorporated into the power networks was:
In step S301, when external electrical network voltage U 3 during greater than threshold voltage U2, the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode;
In step S302, blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work;
In step S303, system converts the pattern of being incorporated into the power networks into batteries to store energy;
In step S304, the network interconnecting circuit between closed microgrid system and the external electrical network;
In step S305, blower fan, photovoltaic generating system are incorporated the microgrid system again into and are generated electricity.
In embodiments of the present invention, when the microgrid system by the pattern of being incorporated into the power networks during to the isolated island mode switch, the batteries to store energy system switches to constant voltage/constant frequency control from Current Control.
In embodiments of the present invention, when the external electrical network fault, the implementation method of the intrasystem distributed power source outage of microgrid is:
For inverter, stop trigger impulse;
For synchronous generator, the contactor that opening power is connected with electrical network.
In embodiments of the present invention, the off-the-line of microgrid system and principle arranged side by side are:
During the external electrical network fault, the intrasystem distributed power source of microgrid should be able to be before network interconnecting circuit carries out the off-the-line operation, and quick and external electrical network is broken off;
Network interconnecting circuit between microgrid system and the external electrical network should have and prevents unplanned isolated island defencive function, prevents the appearance of unplanned isolated island, brings potential safety hazard for the safe operation of higher level's electrical network;
The microgrid system main power source mode switch time can adjust according to the operate time of avoiding power distribution automation or other automatics;
When microgrid system and external electrical network are incorporated into the power networks, should guarantee that all distributed power sources are out of service, non-simultaneous interconnecting problem can not occur;
The distribution system protection that inserts the microgrid system principle of adjusting need be taken all factors into consideration all distributed power sources are provided in the microgrid maximum short circuit current and maximum load current;
Bring off-the-line operation, parallel operation, the internal protection unification of microgrid system into microgrid system capacity management system, realize that the protection monitoring of microgrid system is integrated.
Fig. 4 shows that the embodiment of the invention provides is used for microgrid at isolated island and the structure of the system switched between the pattern of being incorporated into the power networks.For the ease of explanation, only show the part relevant with the present invention.
This system comprises:
Threshold voltage settings module 41 is used to set the microgrid system and is reached by the threshold voltage U2 of isolated island pattern to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch, and threshold voltage U1 is less than threshold voltage U2;
Line voltage monitoring modular 42 is used for the external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
In embodiments of the present invention, mode switch module 43 further comprises:
First mode switch module 431 is used for when external electrical network voltage U 3 during less than threshold voltage U1, with the microgrid system by the pattern of being incorporated into the power networks to the isolated island mode switch;
Second mode switch module 432 is used for when external electrical network voltage U 3 during greater than threshold voltage U2, with the microgrid system by the isolated island pattern to the mode switch that is incorporated into the power networks.
In embodiments of the present invention, first mode switch module 431 further comprises:
The first microgrid isolated location 4311; Be used for when external electrical network voltage U 3 during less than threshold voltage U1; Open the network interconnecting circuit between microgrid system and the external electrical network; Blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work, and open the load loop circuit breaker simultaneously, and the disconnection load is connected with the microgrid system;
Isolated island mode switch element 4312 is used for converting the batteries to store energy system into the isolated island pattern;
The first microgrid switching unit 4313 is used for the closed load circuit breaker, and the foundation load is connected with the microgrid system, incorporates blower fan, photovoltaic generating system into the microgrid system again simultaneously and generates electricity.
In embodiments of the present invention, second mode switch module 432 further comprises:
The second microgrid isolated location 4321 is used for when external electrical network voltage U 3 during greater than threshold voltage U2, and the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode, and blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work;
The mode switch element 4322 that is incorporated into the power networks is used for converting the batteries to store energy system into being incorporated into the power networks pattern;
The second microgrid switching unit 4323 is used for the network interconnecting circuit between closed microgrid system of microgrid and the external electrical network, and blower fan, photovoltaic generating system are incorporated the microgrid system again into and generated electricity.
Below in conjunction with accompanying drawing and specific embodiment application principle of the present invention is further described.
As shown in Figure 1, when the external electrical network fault, the intrasystem distributed power source of microgrid at first cuts off the power supply, for example: for inverter, stop trigger impulse, for synchronous generator, then can be in stand-by state, the contactor that opening power is connected with electrical network; The network interconnecting circuit that is incorporated into the power networks of microgrid system and external electrical network is opened then, and microgrid system internal loading has a power failure in short-term; After confirming that microgrid system and the outside network interconnecting circuit that is incorporated into the power networks are opened, main power source switching controls pattern in the microgrid system rebulids the voltage and the frequency of microgrid system, microgrid system independent operating; It is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from independent operating; After external electrical network is recovered normally; If after detecting the normal also certain time of the network interconnecting circuit grid side voltage that is incorporated into the power networks, stop the operation of blower fan and photovoltaic generating system and batteries to store energy system simultaneously, microgrid system internal loading dead electricity; Assign the network interconnecting circuit that the closed microgrid of instruction system is incorporated into the power networks then; Load is by mains supply, and the microgrid system is incorporated into the power networks behind the switch closure, and blower fan, photovoltaic generating system and batteries to store energy system are incorporated into the power networks again.
The off-the-line of microgrid system, principle arranged side by side:
(1) during the external electrical network fault, the intrasystem distributed power source of microgrid should be able to be before the network interconnecting circuit that is incorporated into the power networks carries out the off-the-line operation, fast with the electrical network disconnection;
(2) network interconnecting circuit that is incorporated into the power networks of microgrid system should have and prevents unplanned isolated island defencive function, prevents the appearance of unplanned isolated island, brings potential safety hazard for the safe operation of higher level's electrical network;
(3) the microgrid system main power source mode switch time can adjust according to the operate time of avoiding power distribution automation or other automatics;
When (4) the microgrid system is incorporated into the power networks, should guarantee that all distributed power sources are out of service again, non-simultaneous interconnecting problem can not occur;
(5) the distribution system protection that inserts the microgrid system principle of adjusting need be taken all factors into consideration maximum short circuit current and the maximum load current that all distributed power sources provided in the microgrid system;
(6) with microgrid system splitting, parallel operation, the unified microgrid system capacity management system of bringing into of microgrid internal system protection, realize that the protection monitoring of microgrid system is integrated.
The embodiment of the invention provides is used for microgrid at isolated island and the method and system that are incorporated into the power networks and switch between the pattern, and when the external electrical network fault, the intrasystem distributed power source of microgrid at first cuts off the power supply; Open the network interconnecting circuit that is incorporated into the power networks of microgrid system and external electrical network then, microgrid system internal loading has a power failure in short-term, after confirming that microgrid system and the outside network interconnecting circuit that is incorporated into the power networks are opened; Main power source switching controls pattern in the microgrid system rebulids the voltage and the frequency of microgrid system, microgrid system independent operating; It is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from independent operating; After external electrical network is recovered normally, if after monitoring the normal also certain time of the network interconnecting circuit grid side voltage that is incorporated into the power networks, stop the operation of blower fan and photovoltaic generating system and batteries to store energy system simultaneously; Microgrid system internal loading dead electricity; Assign the network interconnecting circuit that the closed microgrid of instruction system is incorporated into the power networks then, load is by the external electrical network power supply, after the network interconnecting circuit closure that the microgrid system is incorporated into the power networks; Blower fan, photovoltaic generating system and batteries to store energy system are incorporated into the power networks again; Satisfied the stable operation of microgrid system in the transient process of isolated island, the mode switch that is incorporated into the power networks, reduced transient state transit time effectively, satisfied that the microgrid system safety is reliable, the rapid-action requirement; Improved the controllability of microgrid system in the mode switch process, quick, stable, the reliable characteristics that have.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. one kind is used for microgrid at isolated island and the method that is incorporated into the power networks and switches between the pattern, it is characterized in that this method may further comprise the steps:
Set the microgrid system and reach by the threshold voltage U2 of isolated island pattern, and threshold voltage U1 is less than threshold voltage U2 to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch;
The external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
According to the relation of external electrical network voltage U 3, realize the microgrid system is carried out the isolated island pattern and the switching of the pattern that is incorporated into the power networks with threshold voltage U1, threshold voltage U2.
2. the method for claim 1 is characterized in that, in the said method, the microgrid system by the pattern of being incorporated into the power networks to the implementation method of isolated island mode switch is:
When external electrical network voltage U 3 during, open the network interconnecting circuit between microgrid system and the external electrical network less than threshold voltage U1;
Blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work, and open the load loop circuit breaker simultaneously, and the disconnection load is connected with the microgrid system;
Convert the batteries to store energy system into the isolated island pattern;
The closed load circuit breaker, the foundation load is connected with the microgrid system;
Blower fan, photovoltaic generating system are incorporated the microgrid system again into and are generated electricity.
3. the method for claim 1 is characterized in that, in the said method, the microgrid system by the isolated island pattern to the implementation method of the mode switch that is incorporated into the power networks is:
When external electrical network voltage U 3 during greater than threshold voltage U2, the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode;
Blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work;
System converts the pattern of being incorporated into the power networks into batteries to store energy;
Network interconnecting circuit between closed microgrid system and the external electrical network;
Blower fan, photovoltaic generating system are incorporated the microgrid system again into and are generated electricity.
4. the method for claim 1 is characterized in that, in the said method, when the microgrid system by the pattern of being incorporated into the power networks during to the isolated island mode switch, the batteries to store energy system switches to constant voltage/constant frequency control from Current Control.
5. the method for claim 1 is characterized in that, in the said method, when the external electrical network fault, the implementation method of the intrasystem distributed power source outage of microgrid is:
For inverter, stop trigger impulse;
For synchronous generator, the contactor that opening power is connected with electrical network.
6. one kind is used for microgrid at isolated island and the system that is incorporated into the power networks and switches between the pattern, it is characterized in that this system comprises:
The threshold voltage settings module is used to set the microgrid system and is reached by the threshold voltage U2 of isolated island pattern to the mode switch that is incorporated into the power networks by the threshold voltage U1 of the pattern of being incorporated into the power networks to the isolated island mode switch, and threshold voltage U1 is less than threshold voltage U2;
The line voltage monitoring modular is used for the external electrical network voltage U 3 that monitoring in real time is connected with the microgrid system;
Mode switch module is used for according to the relation of external electrical network voltage U 3 with threshold voltage U1, threshold voltage U2, realizes the microgrid system is carried out the isolated island pattern and the switching of the pattern that is incorporated into the power networks.
7. system as claimed in claim 6 is characterized in that, said mode switch module further comprises:
First mode switch module is used for when external electrical network voltage U 3 during less than threshold voltage U1, with the microgrid system by the pattern of being incorporated into the power networks to the isolated island mode switch;
Second mode switch module is used for when external electrical network voltage U 3 during greater than threshold voltage U2, with the microgrid system by the isolated island pattern to the mode switch that is incorporated into the power networks.
8. like claim 6 or 7 described systems, it is characterized in that said first mode switch module further comprises:
The first microgrid isolated location; Be used for when external electrical network voltage U 3 during less than threshold voltage U1; Open the network interconnecting circuit between microgrid system and the external electrical network; Blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work, and open the load loop circuit breaker simultaneously, and the disconnection load is connected with the microgrid system;
The isolated island mode switch element is used for converting the batteries to store energy system into the isolated island pattern;
The first microgrid switching unit is used for the closed load circuit breaker, and the foundation load is connected with the microgrid system, incorporates blower fan, photovoltaic generating system into the microgrid system again simultaneously and generates electricity.
9. system as claimed in claim 7 is characterized in that, said second mode switch module further comprises:
The second microgrid isolated location is used for when external electrical network voltage U 3 during greater than threshold voltage U2, and the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode, and blower fan, photovoltaic generating system and batteries to store energy system temporarily quit work;
The mode switch element that is incorporated into the power networks is used for converting the batteries to store energy system into being incorporated into the power networks pattern;
The second microgrid switching unit is used for the network interconnecting circuit between closed microgrid system of microgrid and the external electrical network, and blower fan, photovoltaic generating system are incorporated the microgrid system again into and generated electricity.
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| CN102983593A (en) * | 2012-12-25 | 2013-03-20 | 中国东方电气集团有限公司 | Seamless handover control method for microgrid based on intelligent switch |
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