CN109066774B - Management and control system and method for area using distributed energy - Google Patents
Management and control system and method for area using distributed energy Download PDFInfo
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- CN109066774B CN109066774B CN201810869311.XA CN201810869311A CN109066774B CN 109066774 B CN109066774 B CN 109066774B CN 201810869311 A CN201810869311 A CN 201810869311A CN 109066774 B CN109066774 B CN 109066774B
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- 238000004891 communication Methods 0.000 claims abstract description 13
- 238000004146 energy storage Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001788 irregular Effects 0.000 abstract description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a distributed energy region management and control system, wherein a distributed energy region management and control device is installed at a substation outlet terminal, a grid-connected interface device is installed at each distributed energy grid-connected point, and each grid-connected interface device is respectively in communication connection with the distributed energy grid-connected point and is also in communication connection with a remote distributed energy region management and control device. The system can effectively inhibit the influence of power fluctuation and irregular start and stop of distributed energy on the power supply voltage quality of the power distribution network through the power control of the energy storage system, and effectively improves the voltage level of the network.
Description
The technical field is as follows:
the invention belongs to the technical field of power transmission, and particularly relates to a distributed energy region management and control system for solving the problem of voltage out-of-limit caused by grid connection of distributed energy by using the distributed energy region management and control system, and a control method of the system.
Background art:
the starting and the shutdown of the distributed energy in the intelligent power distribution network are easily influenced by a plurality of factors such as natural conditions, user requirements, policy and regulations and the like, so that the distributed energy is easily started and stopped irregularly, and the power output of the intermittent distributed energy has inherent fluctuation and intermittence, which can cause obvious voltage fluctuation to the power distribution network. In addition, the voltage quality of the distribution network may be further degraded by the uncoordinated operation of the distributed energy source and the load of the distribution network. For example, photovoltaic power generation can generate large active power at noon when the illumination intensity is large and no power output at night, which may result in a higher voltage level at that point during the day and a lower voltage level during the night, which is more evident especially if the photovoltaic capacity is large, with the access point at the end of the feeder.
The invention content is as follows:
the present invention is directed to a distributed energy region management and control system, so as to overcome the above-mentioned defects in the prior art.
In order to achieve the purpose, the invention provides a distributed energy region management and control system, wherein a distributed energy region management and control device is installed at a substation outlet end, a grid-connected interface device is installed at each distributed energy grid-connected point, and each grid-connected interface device is respectively in communication connection with the respective distributed energy grid-connected point and is also in communication connection with a remote distributed energy region management and control device.
The invention further defines the technical scheme as follows:
preferably, in the above technical solution, the distributed energy source is a distributed photovoltaic power station.
A control method utilizing a distributed energy region management and control system is carried out according to the following steps:
s1, connecting grid-connected interface equipment at the distributed energy grid-connected position in a communication manner;
s2, setting parameters of each distributed energy resource on the distributed energy resource area management and control device includes: rated capacity, voltage override and regulation command;
s3, each interface device sends the voltage of the position and the running state of the distributed energy to a distributed energy area control device;
s4, setting a voltage standard value, comparing the voltage value obtained by each grid-connected interface device with the voltage standard value, entering S5 if the difference between the two voltage values is larger than a voltage threshold value, and otherwise, continuing to repeat S4;
s5, when the distributed energy region management and control device determines that the voltage is out of limit, the distributed energy region management and control device executes the following 2 policies: reducing DG (Distributed Generation, DG) output, and charging an energy storage battery;
s6, sending the 2 strategies to grid-connected interface equipment at the voltage crossing line;
s7, charging the energy storage battery at the position by the grid-connected interface equipment according to the received strategy and the charging current amount;
s8, the distributed energy resource area management and control equipment compares the voltage value with the voltage standard value according to the voltage value received at the moment, if the difference between the voltage value and the voltage standard value is smaller than the voltage threshold value, the sending of the adjusting command is stopped, the step S4 is repeated, and if the difference between the voltage value and the voltage threshold value is larger than the voltage threshold value, the DG output force is continuously reduced;
s9, repeating the step S8 until the DG output is 0.
The invention further defines the technical scheme as follows:
preferably, in the above technical solution, in step S4, the voltage of the grid-connected point of the distributed energy is set to be U in order from near to far from the substation1、U2。。。UnN is a positive integer, when UnIf the difference from the standard voltage value is greater than the threshold voltage value, all the grid-connected points behind the standard voltage value enter S5.
Preferably, in the above technical solution, in step 1, if the distributed energy grid-connected location already has a similar device, a communication switching device is deployed to complete local data acquisition and a function of communicating with the distributed energy regional control device.
Compared with the prior art, the invention has the following beneficial effects: the influence of power fluctuation and irregular starting and stopping of distributed energy on the quality of the power supply voltage of the power distribution network can be effectively inhibited through the power control of the energy storage system, and the voltage level of the network is effectively improved.
Description of the drawings:
FIG. 1 is a schematic diagram of a prior art power distribution network;
fig. 2 is a schematic diagram of the distributed energy region management and control system of the present invention installed in a power distribution grid;
FIG. 3 is a schematic diagram illustrating the adjustment after the lower limit of the voltage is exceeded;
fig. 4 is a schematic diagram of adjustment after the upper limit of the voltage is exceeded.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The utility model provides a regional management and control system of distributed energy which characterized in that: a distributed energy region management and control device is installed at an outlet of a transformer substation, and a grid-connected interface device is installed at each distributed energy grid-connected point at the lower end of the distributed energy region management and control device. The grid-connected interface equipment transmits current, voltage, switch position and relevant parameters of distributed energy resources of corresponding nodes to the regional control equipment in real time. And the region management and control equipment controls the distributed energy resources at the lower end according to the data.
The schematic of the system is shown in fig. 2.
In many cases, grid connection of distributed energy reduces voltage quality. However, the voltage quality of some nodes can be obviously improved by the distributed energy region management and control system shown in fig. 2, and the problem of voltage out-of-limit is avoided.
A control method of a distributed energy region management and control system is carried out according to the following steps:
1) and deploying the distributed energy source area management and control equipment at the outgoing line of the transformer substation.
2) Interface equipment is deployed at the distributed energy grid connection position (if similar equipment is already arranged at the distributed energy grid connection position, a communication switching device is deployed to complete the functions of local data acquisition and communication with distributed energy region management and control equipment);
3) setting parameters of each distributed energy on distributed energy region management and control equipment: rated capacity, voltage over-limit, regulation command, etc.;
4) each grid-connected interface device sends the voltage at the position and the running state of the distributed energy to the distributed energy area management and control equipment;
5) when the distributed energy region management and control equipment judges that the voltage of the U3 is out of limit, a strategy is given according to the running state of the distributed energy at the moment; (taking the example that the voltage of U3 is higher than the upper limit)
6) The distributed energy region management and control equipment executes the following 2 strategies 1) to reduce the DG output; 2) charging an energy storage battery;
7) and sending the strategy 2 to grid-connected interface equipment at the energy storage battery.
8) The grid-connected interface equipment at the energy storage battery charges the battery according to the received strategy and the charging current amount;
9) the distributed energy region management and control equipment stops sending the adjustment command if the voltage is within the qualified range according to the voltage of U2 and U3 received at this time. If not, the following steps are continued.
10) And sending the strategy 1 to the grid-connected interface equipment at the DG.
11) The grid-connected interface equipment at the DG adjusts the DG according to the received strategy and the output adjustment quantity;
12) the distributed energy region management and control equipment stops sending the adjustment command if the voltage is within the qualified range according to the voltage of U2 and U3 received at this time. If not, continuing with steps 10) and 11). Until the adjustment reaches a maximum value (i.e., the distributed DG contribution is 0).
The voltage quality is improved through the distributed energy region management and control system, and the process for solving the voltage out-of-limit problem is as follows:
in FIG. 3, the curve II shows that the DG has no output (or quits working) and the stored energy is not involved in the regulation, and it can be seen that U is at this time2Has a low node voltage level of U3Because at the end of the feed line, the node voltage level crosses the low voltage limit.
After the distributed energy region management and control system is installed, the current U of the grid-connected interface equipment in the system is measured1、U2And U3The voltage value, the DG output state and the running state of the energy storage battery are transmitted through the looped networkThe data is input to distributed energy region management and control equipment, and after the data is concentrated by the equipment, U is judged3The lower the voltage is present, the following 2 strategies 1) are implemented to increase the DG output; 2) the energy storage battery discharges. The 2 strategies are also executed by transmitting the strategies to the grid-connected interface equipment through the ring network to implement specific operations.
In FIG. 4, curve II shows that DG has a larger output power and the stored energy does not participate in the regulation, and it can be seen that U is at this time2Has a higher node voltage level, U3The node voltage level crosses the low voltage limit.
After the distributed energy region management and control system is installed, the current U of the grid-connected interface equipment in the system is used1、U2And U3The voltage value, the DG output state and the running state of the energy storage battery are transmitted to distributed energy source area management and control equipment through a ring network, and after the equipment concentrates data, U is judged3The upper limit of the voltage is higher, the following 2 strategies 1) are implemented to reduce the DG output; 2) and charging the energy storage battery. The 2 strategies are also executed by transmitting the strategies to the grid-connected interface equipment through the ring network to implement specific operations.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. A control method utilizing a distributed energy region management and control system is characterized in that: the method comprises the following steps:
s1, connecting grid-connected interface equipment at the distributed energy grid-connected position in a communication manner;
s2, setting parameters of each distributed energy resource on the distributed energy resource area management and control device includes: rated capacity, voltage override and regulation command;
s3, each interface device sends the voltage of the position and the running state of the distributed energy to a distributed energy area control device;
s4, setting a voltage standard value, comparing the voltage value obtained by each grid-connected interface device with the voltage standard value, if the difference between the two is larger than a voltage threshold value, entering S5, and if not, continuing to repeat S4;
s5, when the distributed energy region management and control device determines that the voltage is out of limit, the distributed energy region management and control device executes the following 2 policies: the output of DG is reduced, and the energy storage battery is charged;
s6, sending the 2 strategies to grid-connected interface equipment at the voltage crossing line;
s7, charging the energy storage battery at the position by the grid-connected interface equipment according to the received strategy and the charging current amount;
s8, the distributed energy region management and control equipment compares the voltage value with the voltage standard value according to the voltage value received at the moment, if the difference between the voltage value and the voltage standard value is smaller than the voltage threshold value, the transmission of the adjustment command is stopped, the step S4 is repeated, and if the difference between the voltage value and the voltage threshold value is larger than the voltage threshold value, the DG output is continuously reduced;
s9, repeating the step S8 until the DG output is 0.
2. The control method using the distributed energy region management and control system according to claim 1, wherein: in step S4, the voltages of the distributed energy grid-connected points are set to be U1 and U2 … Un from near to far from the substation, where n is a positive integer, and when the standard value difference between Un and the voltage is greater than the voltage threshold, all the distributed energy grid-connected points behind Un enter S5.
3. The control method using the distributed energy region management and control system according to claim 1, wherein: in the step 1, if the distributed energy grid-connected part already has equipment similar to grid-connected interface equipment, a communication switching device is deployed to complete the functions of on-site data acquisition and communication with distributed energy region management and control equipment.
4. The control method using the distributed energy region management and control system according to claim 1, wherein: the distributed energy resource area management and control system specifically comprises: the method comprises the steps that distributed energy region management and control equipment is installed at a wire outlet end of a transformer substation, grid-connected interface equipment is installed at each distributed energy grid-connected point, and each grid-connected interface equipment is respectively in communication connection with the distributed energy grid-connected point and is also in communication connection with remote distributed energy region management and control equipment.
5. The control method using the distributed energy region management and control system according to claim 1, wherein: the distributed energy is a distributed photovoltaic power station.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202856379U (en) * | 2011-09-20 | 2013-04-03 | 浙江工业大学 | Distributed photovoltaic power generation regional integrated control device |
| CN104123427A (en) * | 2014-08-11 | 2014-10-29 | 国家电网公司 | Regional distributed photovoltaic power generation system modeling method based on IEC61850 standard |
| CN105870964A (en) * | 2016-03-31 | 2016-08-17 | 国网天津市电力公司 | Microgrid-based distributed photovoltaic power generation boost (Boost) control method |
| CN106786610A (en) * | 2016-11-27 | 2017-05-31 | 东北电力大学 | A kind of photovoltaic high permeability line voltage optimization method based on energy-storage battery |
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| US8401709B2 (en) * | 2009-11-03 | 2013-03-19 | Spirae, Inc. | Dynamic distributed power grid control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202856379U (en) * | 2011-09-20 | 2013-04-03 | 浙江工业大学 | Distributed photovoltaic power generation regional integrated control device |
| CN104123427A (en) * | 2014-08-11 | 2014-10-29 | 国家电网公司 | Regional distributed photovoltaic power generation system modeling method based on IEC61850 standard |
| CN105870964A (en) * | 2016-03-31 | 2016-08-17 | 国网天津市电力公司 | Microgrid-based distributed photovoltaic power generation boost (Boost) control method |
| CN106786610A (en) * | 2016-11-27 | 2017-05-31 | 东北电力大学 | A kind of photovoltaic high permeability line voltage optimization method based on energy-storage battery |
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