CN104267777A - Allocation type solar power grid-connected power generation control method based on wireless network - Google Patents

Allocation type solar power grid-connected power generation control method based on wireless network Download PDF

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CN104267777A
CN104267777A CN201410369818.0A CN201410369818A CN104267777A CN 104267777 A CN104267777 A CN 104267777A CN 201410369818 A CN201410369818 A CN 201410369818A CN 104267777 A CN104267777 A CN 104267777A
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power
central controller
network
information
photovoltaic solar
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CN104267777B (en
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王旭东
皮宜博
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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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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Abstract

An allocation type solar power grid-connected power generation control method based on the wireless network includes 1, utilizing inverters arranged in solar photovoltaic systems, and collecting the local information of the solar photovoltaic systems; 2, allowing a central controller to calculate the network total allocated power PS; 3, allowing the central controller to transmit the calculated allocated power Pi to the corresponded solar photovoltaic systems, and allowing the corresponded inverters to adjust fresh power points of the solar photovoltaic systems according to the received allocated power Pi; 4, allowing the central controller to detect whether the network state meets optional one of three boundary conditions or not, and calculating fresh power indexes and transmitting to terminal nodes of the solar photovoltaic systems. By the aid of the method, the problems of over voltage, power upstream and fair resource allocation of the existing system are solved.

Description

Based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control method
Technical field
The present invention relates to photovoltaic solar system power point control technical field in electrical network, particularly relate to a kind of based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control method
Background technology
Voltage attenuation technology, it is a kind of method of this locality regulation and control photovoltaic solar system voltage, it does not need the information interaction in network and the understanding to topological structure of electric, reduces the output power of photovoltaic solar system, effectively can solve overvoltage problem simply by inverter.
There is following shortcoming in the method:
1) power reflux problem is not considered
2) the resource fairness assignment problem of different photovoltaic solar system is not considered
Droop control inverter, can realize the fair allocat of regulating and controlling voltage and resource simultaneously.But there is following shortcoming in the method:
1) power reflux problem is not considered
2) need the adjacency matrix of distributed network, but in reality, this matrix is difficult to obtain
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control method
The technical solution adopted in the present invention is:
Based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control a method, its feature is, the method comprises the steps:
1. utilize the inverter be arranged in each photovoltaic solar system, the local information of collection photovoltaics solar energy system, comprises the output power of each photovoltaic solar system the consumed power of each load system and be transferred to central controller;
2. central controller computational grid can distribute general power P s, formula is as follows:
P S = P 0 - P 0 lb + Σ i = 1 n ( P G i - P L i ) ,
Wherein, P 0for the active power obtained from electrical network, for the adverse current power that transformer allows, n is photovoltaic solar system quantity in network;
Central controller is each photovoltaic solar system assignment power P i, formula is as follows:
P i＝k iP S，
K ifor each solar panels area and the ratio of the size of the solar panels total area;
3. the distribution power P that will calculate of central controller isend to corresponding photovoltaic solar system, corresponding inverter is according to the distribution power P received ifor the power points that photovoltaic solar system call interception is new;
4. central controller is after receiving the local information feedback result of photovoltaic solar system update, and whether supervising network state meets any one in following three boundary conditions:
1) voltage reaches the upper limit
2) power adverse current reaches thresholding
3) all photovoltaic solar systems obtain power stage maximum as far as possible
If meet, be considered as network and reach optimization aim; Central controller Sampling network power reflux flow, if reflux flow reaches thresholding, calculates new power index and is distributed to each photovoltaic solar system terminal node.
Described step 1. in local information in each photovoltaic solar system be transferred to central controller, specifically comprise the steps:
Step 11, build wireless mesh network: the first level is the multihop network of the mesh router composition that frequency range is identical, second level is terminal node access network, use a mesh router the first level and the second level to be linked together, Web vector graphic WiFi connects;
Information transmission in step 12, network is divided into three parts:
Part I: information is sent to each mesh router from central controller, be distributed to each terminal node again: the indication information that all terminal nodes need is merged into a bag and once transmitted by central controller, agreement adopts oriented flooding method, and information is sent to all adjacent terminal nodes and all mesh routers except information source by the mesh router receiving information;
Part II: information is sent to each mesh router from terminal node, and being ultimately delivered to central controller: terminal node chooses most suitable mesh router according to quality of connection, the comprehensive quality of connection of mesh router and choose the down hop mesh router that will send to the minimum hop count of central controller, integrated and together send on mesh router from the information of different terminals node;
Part III: the measure for network failure: the cycle state information that central controller is sent by sense terminals node and control report information judge in network, whether specific node goes wrong, locally through the control information judging whether to receive in certain hour central controller, node judges whether oneself is isolated in a network, if systems axiol-ogy is to orphan terminal node, the collaboration power point tracking algorithm that this node starts a new round temporarily got rid of by central controller, controlled output power simply by isolated node this locality according to load.
Described step 3. each photovoltaic solar system according to the distribution power P received from central controller i, use this ground voltage method for tracing to upgrade its output power last look, have three results:
1) up-to-date power points touches the mark requirement
2) up-to-date power points reaches maximal value before the requirement that touches the mark
3) in local tracing process, there occurs overvoltage problem
When first two result occurs, inverter directly by status information feedback to central controller, when the third result occurs, inverter first uses voltage attenuation method to reduce output power, then by feedback of status to central controller.
Compared with prior art, the invention has the beneficial effects as follows:
1) complete frame that is applicable to photovoltaic solar system electrical network distributed collaborative powerinjected method algorithm is proposed.
2) being an optimization problem by distributed collaborative powerinjected method arthmetic statement, meeting in three boundary conditions under any one prerequisite, making the output power of photovoltaic solar system maximum.
3) devise the photovoltaic solar system power fair allocat that a distributed power tracing algorithm realizes weighting, and in each photovoltaic solar system, devise practical Adjusted Option regulates and controls each photovoltaic solar system output power according to the power index that central controller calculates.
4) construct a wireless mesh network, devise an effective host-host protocol, to ensure the realization of such scheme.
Accompanying drawing explanation
Fig. 1 is that the present invention uses voltage attenuation technology to solve the schematic diagram of overpressure problems;
Fig. 2 is the structural representation of wireless mesh network in the present invention.
Fig. 3 is the sequential relationship of the information interaction of central controller and inverter in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described, but should not limit the scope of the invention with this.
1. each photovoltaic solar system terminal node collects local state information, comprises the power that photovoltaic solar system produces the power of photovoltaic solar system consumption central controller is sent to by special network and agreement.
2. central controller can distribute general power according to the information computational grid collected P S = P 0 - P 0 lb + Σ i = 1 n ( P G i - P L i ) , P 0for the active power obtained from electrical network, for the adverse current power that transformer allows, n is photovoltaic solar system quantity in network.First be each photovoltaic solar system assignment power: P i=k ip s, k ifor each solar panels area and the ratio of the size of the solar panels total area.
3. the power points index calculated is sent to corresponding photovoltaic system by central controller.
4. terminal node is according to the output power of the power index received in this locality regulation and control photovoltaic solar system, may have following three kinds of situations
1) up-to-date power points touches the mark requirement
2) up-to-date power points reaches maximal value before the requirement that touches the mark
3) in local tracing process, there occurs overvoltage problem
5. when first two situation occurs, inverter directly by status information feedback to central controller, when the third result occurs, inverter first uses voltage attenuation method to reduce output power, then by feedback of status to central controller.For two kinds of situations (as shown in Figure 1) that superpotential may occur, local regulative mode can guarantee that overvoltage problem is resolved:
1) neighbor node of overvoltage node (as No. 2 users in Fig. 1) is working properly: now the reactive power of overvoltage photovoltaic solar system is flowed to surrounding normal node from overvoltage node by inverter.
2) the same overvoltage of the neighbor node of overvoltage node (as in Fig. 16,7, No. 8 users), but near there is normal node: inverter control poower flow flows to normal node, normal to make overvoltage node voltage reply.
6. central controller is after receiving feedback result, and whether its supervising network state meets any one in following three boundary conditions:
1) voltage reaches the upper limit
2) power adverse current reaches thresholding
3) all photovoltaic solar systems obtain power stage maximum as far as possible
7., if meet, be considered as network and reach optimization aim.Central controller Sampling network power reflux flow, if reflux flow reaches thresholding, controller calculates new power index fast and is distributed to each photovoltaic solar system terminal node.
8. in photovoltaic solar grid, build a wireless mesh network, network structure as shown in Figure 2, wireless mesh network is made up of two levels, first level is the multihop network of the mesh router composition that frequency range is identical, second level is terminal node access network, uses a mesh router the first level and the second level to be linked together.Web vector graphic WiFi connects.Information interaction between central controller and terminal node as shown in Figure 3.
9. scheme devises host-host protocol to every layer, and for central controller, middle mesh router, the information interaction between terminal node, reduces network delay to improve network stabilization, improve the speed of convergence of distributed power tracing algorithm to greatest extent.Information transmission in the algorithm in network is divided into two parts:
10. information is sent to each mesh router by central controller, then is distributed to each terminal node.In this process, the power index of each photovoltaic solar system is merged into a bag by central controller, mesh router is distributed to by the mode of oriented inundation, distribution of information is gone down by mesh router more successively, final information incoming terminal node, so-called oriented inundation, refers to when information transmission, and information is only transmitted to adjacent terminal node and the mesh router except information source by the mesh router receiving information.
11. terminal nodes are sent to each mesh router by what collect status information, and are ultimately delivered to central controller.Terminal node selects the router with optimum quality of connection among connected all mesh routers, and the status information of collection is sent to this mesh router.In mesh router, the bag that the status information of the dispersion received is integrated into, and decide next hop router according to the Distance geometry quality of connection of mesh router distance central controller, particularly, selection scheme is: select the shortest path mesh router meeting quality of connection requirement.
12. especially, and all terminal nodes need to adopt the synchronous method of TSF to carry out clock synchronous, and each terminal node adds a random back-off before transmission periodic report information, solves the collision problem of periodic report information with this.
13. for the measure of network failure, the cycle state information that central controller is sent by sense terminals node and control report information judge in network, whether specific node goes wrong, locally through the control information judging whether to receive in certain hour central controller, node judges whether oneself is isolated in a network, if systems axiol-ogy is to orphan terminal node, the collaboration power point tracking algorithm that this node starts a new round temporarily got rid of by central controller, output power is controlled according to load simply by isolated node this locality, especially, in order to avoid permanent connection failure, its solar panels can be closed by isolated node and give the alarm.

Claims (3)

1. based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control a method, it is characterized in that, the method comprises the steps:
1. utilize the inverter be arranged in each photovoltaic solar system, the local information of collection photovoltaics solar energy system, comprises the output power of each photovoltaic solar system the consumed power of each load system and be transferred to central controller;
2. central controller computational grid can distribute general power P s, formula is as follows:
P S = P 0 - P 0 lb + Σ i = 1 n ( P G i - P L i ) ,
Wherein, P 0for the active power obtained from electrical network, for the adverse current power that transformer allows, n is photovoltaic solar system quantity in network;
Central controller is each photovoltaic solar system assignment power P i, formula is as follows:
P i＝k iP S，
K ifor each solar panels area and the ratio of the size of the solar panels total area;
3. the distribution power P that will calculate of central controller isend to corresponding photovoltaic solar system, corresponding inverter is according to the distribution power P received ifor the power points that photovoltaic solar system call interception is new;
4. central controller is after receiving the local information feedback result of photovoltaic solar system update, and whether supervising network state meets any one in following three boundary conditions:
1) voltage reaches the upper limit
2) power adverse current reaches thresholding
3) all photovoltaic solar systems obtain power stage maximum as far as possible
If meet, be considered as network and reach optimization aim; Central controller Sampling network power reflux flow, if reflux flow reaches thresholding, calculates new power index and is distributed to each photovoltaic solar system terminal node.
2. the method for tracing of photovoltaic solar cooperative system power points in electrical network according to claim 1, is characterized in that, described step 1. in local information in each photovoltaic solar system be transferred to central controller, specifically comprise the steps:
Step 11, build wireless mesh network: the first level is the multihop network of the mesh router composition that frequency range is identical, second level is terminal node access network, use a mesh router the first level and the second level to be linked together, Web vector graphic WiFi connects;
Information transmission in step 12, network is divided into three parts:
Part I: information is sent to each mesh router from central controller, be distributed to each terminal node again: the indication information that all terminal nodes need is merged into a bag and once transmitted by central controller, agreement adopts oriented flooding method, and information is sent to all adjacent terminal nodes and all mesh routers except information source by the mesh router receiving information;
Part II: information is sent to each mesh router from terminal node, and being ultimately delivered to central controller: terminal node chooses most suitable mesh router according to quality of connection, the comprehensive quality of connection of mesh router and choose the down hop mesh router that will send to the minimum hop count of central controller, integrated and together send on mesh router from the information of different terminals node;
Part III: the measure for network failure: the cycle state information that central controller is sent by sense terminals node and control report information judge in network, whether specific node goes wrong, locally through the control information judging whether to receive in certain hour central controller, node judges whether oneself is isolated in a network, if systems axiol-ogy is to orphan terminal node, the collaboration power point tracking algorithm that this node starts a new round temporarily got rid of by central controller, controlled output power simply by isolated node this locality according to load.
3. the method for tracing of photovoltaic solar cooperative system power points in electrical network according to claim 1, is characterized in that, described step 3. each photovoltaic solar system according to the distribution power P received from central controller i, use this ground voltage method for tracing to upgrade its output power last look, have three results:
1) up-to-date power points touches the mark requirement
2) up-to-date power points reaches maximal value before the requirement that touches the mark
3) in local tracing process, there occurs overvoltage problem
When first two result occurs, inverter directly by status information feedback to central controller, when the third result occurs, inverter first uses voltage attenuation method to reduce output power, then by feedback of status to central controller.
CN201410369818.0A 2014-07-30 2014-07-30 Based on wireless network realize distributed solar energy generate electricity by way of merging two or more grid systems control method Expired - Fee Related CN104267777B (en)

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CN114633652B (en) * 2022-02-16 2024-01-05 深圳市道通合创数字能源有限公司 Charging system, method and device for dynamic power distribution, main charging pile and medium

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