CN105629765A - Multi-microgrid access strategy control simulation platform in power distribution network - Google Patents
Multi-microgrid access strategy control simulation platform in power distribution network Download PDFInfo
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Abstract
The invention relates to a multi-microgrid access strategy control simulation platform in a power distribution network, and belongs to the technical field of power generation, power transformation or power distribution. The platform comprises a multi-microgrid model implementation module, a user interface module, a data transmission module, a load flow calculation module and a control module. The simulation platform can continuously and circularly change the microgrid control strategy according to the running state and display the microgrid running state in real time. The simulation platform also adopts hierarchical control, communication exists among all controllers, coordination control of the microgrid is convenient to realize, and all the controllers are controlled according to the local network state operation mode, so that the controllers have certain independence, and the reliability of microgrid operation is improved.
Description
Technical field
The present invention relates to many microgrids access strategy in a kind of power distribution network and control emulation platform, belong to generating, power transformation or distribution technique field.
Background technology
From 21 century, research worker starts to recognize the deficiency of existing electric power system. First: the requirement forecasting technology of existing electric power system and data processing technique are not provided that the instant energy; Secondly emerging environmental security and energy problem limit the scale of its economic development. Hence with luminous energy, wind energy, biogas equal energy source generation mode arise at the historic moment, distributed generation technology has that environmental pollution is little, efficiency of energy utilization is high and generation mode feature flexibly, having become the focus of power system research, the concept of distributed power source is suggested.
Distributed power source (i.e. DistributedGeneration is called for short DG) refers to the particular/special requirement for meeting terminal use, is connected on the compact electrical generating systems near user side. Their scale is generally little, it is generally tens kilowatts to tens megawatts, the energy used includes clean energy resource or the regenerative resources such as natural gas (containing coal bed gas, biogas), solar energy, biological intelligence, Hydrogen Energy, wind energy, small power station, and energy storage device is mainly accumulator etc. In order to improve energy utilization rate, reduce cost simultaneously, often adopt the system that the various energy such as hot and cold, electric are supplied together to become distributed power supply system, and the power system including distributed energy is called distributed energy power system.
Up to now, the potentiality of Distributed Power Generation are not yet not fully exerted, and trace it to its cause, mainly have following some:
(1) characteristic of distributed power source self determines exerting oneself of some power supplys and the change with external condition is changed, show the features such as intermittent and randomness, the regulating power that these power supplys only rely on self is made to be difficult to meet the power-balance of load, and non-scheduling, it is necessary to the cooperation of other power supplys or energy storage device is to provide support and standby.
(2) the trend distribution changing in system of being incorporated into the power networks of distributed power source, for power distribution network, owing to the access of distributed power source causes having in system bi-directional current, to voltage-regulation, protection coordination and energy-optimised bring new problem.
(3) most distributed power sources require over power electronics interface and are connected to the grid, the introducing of a large amount of power electronic equipments and electric capacity, inductance, easily affect the power supply quality of periphery user, extraneous produce to disturb may result in the asynchronous of frequency and voltage, thus wearing whole system down.
(4) numerous, form is different, the distributed power source of non-scheduling will be given and rely on the tradition system operations staff that is managed of centralized power scheduling mode bring bigger difficulty, lack effective management by " randomness " when causing that distributed power source runs, cause a hidden trouble to the safety and stability of system.
Distributed power generation makes the relay protection scheme of distribution and controls the problems such as selection is more complicated of device and also have to consider; in order to excavate the potentiality of distributed power generation better; solving the adverse effect that bulk power grid is brought by distributed power generation, the concept of microgrid is suggested.
Microgrid refers to small-sized the distribution system collected by distributed power source, energy storage device, energy converter, associated loadings and monitoring, protection device; it it is an autonomous system being capable of self-contr ol, protection and management; both can be incorporated into the power networks with bulk power grid, it is also possible to isolated operation. Existing research and practice, it has been shown that distributed power source energy supplying system is accessed bulk power grid with the form of microgrid and is incorporated into the power networks, support each other with bulk power grid, are the most effective modes playing distributed power generation energy supplying system usefulness.
Microgrid has following distinguishing feature: (1) microgrid is integrated with various energy resources input (solar energy, wind energy, conventional fossil fuel, biomass energy etc.), multi output of procucts (hot and cold, electric etc.), various energy resources converting unit (fuel cell, miniature gas turbine, internal combustion engine, energy-storage system etc.), it is the non-same sex complication system that intercouples of the behaviors such as chemistry, thermodynamics, electrodynamics, has and realize the Inherent advantage that the integration of Fossil fuel and regenerative resource recycles. (2) microgrid comprises multiple distributed power source, and installation site is flexible, accesses typically via power electronics interface, and by certain control strategy coordinated operation, is jointly unified in this organism of microgrid. Therefore, microgrid is required for the analysis method of self exclusive applicable diverse access point of feature development in operation, control, protection etc. (3) in general, a points of common connection (PCC) is only existed between microgrid and external power grid, therefore, for external power grid, microgrid is considered as a controllable electric power in electrical network or load, and it can react with the demand of satisfied outside transmission and distribution networks within the several seconds, both can obtain energy from external power grid, in microgrid when supply of electric power abundance or external power grid electricity shortage, microgrid even can to the electrical network energy of falling power transmission. (4) there are two kinds of operational modes in microgrid, and under normal condition, with external power grid networking operation, microgrid and external power grid coordinated operation, the common load given in microgrid is powered; When monitor external power grid fault or the quality of power supply can not meet require time, then microgrid proceeds to islet operation pattern, power supply is continued to critical load in microgrid by the distributed power source in microgrid, ensure the uninterrupted supply of electric power of load, maintain microgrid self the supply and demand energy balance, thus improve the safety and reliability of power supply; Until external power grid failure vanishes or the quality of power supply meet require time, microgrid is switched to networking operation pattern again. Piconet controller needs the change according to actual motion condition to realize taking over seamlessly between both of which. (5) microgrid generally there are top level control device, by EMS, distributed power source carries out economic load dispatching and energy-optimised management, it is possible to use the complementarity of various distributed power sources in microgrid, more adequately and reasonably utilizes the energy.
The domestic research to microgrid is started late, the research at present microgrid controlled imperfection, the application of microgrid is also deeply restricted, therefore, in a kind of power distribution network of research, many microgrids access strategy controls analog systems, in order to the further investigation that microgrid is controlled has great importance.
Summary of the invention
The technical problem to be solved in the present invention is, not enough for prior art, it is proposed to one can simulate many microgrids Access Control Policy, checks that in the power distribution network of control strategy effect, many microgrids access strategy controls emulation platform.
The present invention solves that the technical scheme that above-mentioned technical problem proposes is: in a kind of power distribution network, many microgrids access strategy controls emulation platform, including many microgrids model realization module, subscriber interface module, data transmission module, Load flow calculation module and control module;
Described many microgrids model realization module is used for building many microgrids model;
Described subscriber interface module is for carrying out Dynamic Announce to described many microgrids model;
Described data transmission module processes and transmission for described many microgrids model realization module, subscriber interface module, Load flow calculation module, data summarization between communication module and control module;
Described Load flow calculation module is for carrying out Load flow calculation to described many microgrids model;
Described control module is for coordinating control to described many microgrids model;
The signal output part of described many microgrids model realization module is connected with the signal input part of described subscriber interface module by data transmission module, the signal output part of described subscriber interface module is connected with the signal input part of described Load flow calculation module by data transmission module, the signal output part of described Load flow calculation module is connected with the signal input part of the signal input part of described subscriber interface module and control module respectively by data transmission module, the signal output part of described control module is connected with the signal input part of described Load flow calculation module and the signal input part of many microgrids pattern die respectively by data transmission module.
Further: described many microgrids model includes the sub-microgrid in microgrid and this microgrid, and described microgrid is connected by unique and site with power distribution network, and described microgrid is connected by unique access point with described sub-microgrid;
Described control module includes the load governor in the piconet controller in the central controller in described microgrid, described sub-microgrid, the micro-source controller in described sub-microgrid and described sub-microgrid;
Described micro-source controller includes main micro-source controller and from micro-source controller;
Described central controller is for regulating the running status of described microgrid, described piconet controller is for regulating the running status of described sub-microgrid, the micro-source controller of described master is for regulating the output voltage frequency of described distributed power source, described from micro-source controller for regulating the output of described distributed power source, described load governor is for regulating the running status of load in described sub-microgrid.
Further: also to include communication module, described communication module is for described central controller, piconet controller, order between micro-source controller and load governor and status data transfers.
Further: described many microgrids model realization module is netlogo, and described data transmission module is matlab, and described Load flow calculation module is opendss.
The present invention adopts technique scheme to provide the benefit that: 1) owing to the signal output part of Load flow calculation module is connected with the signal input part of the signal input part of described subscriber interface module and control module respectively by data transmission module, the signal output part of described control module is connected with the signal input part of described Load flow calculation module and the signal input part of many microgrids pattern die respectively by data transmission module, so this emulation platform can circulate change microgrid control strategy continuously and show microgrid running status in real time according to running status, 2) owing to control module includes the central controller in described microgrid, piconet controller in described sub-microgrid, micro-source controller in described sub-microgrid and the load governor in described sub-microgrid, it is not adopt traditional by central controller, entirety to be made control, but each controller is controlled based on local runtime state, owing to adopting hierarchical control, communication is there is between each controller, the coordination facilitating implementation microgrid controls, and each controller is controlled according to local network state operational mode, this makes controller have certain independence, add microgrid reliability of operation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the module call graph that in a kind of power distribution network of the embodiment of the present invention, many microgrids access strategy controls emulation platform.
Fig. 2 is the control realization block flow diagram that in a kind of power distribution network of the embodiment of the present invention, many microgrids access strategy controls emulation platform.
Fig. 3 is the microgrid running state conversion figure that in a kind of power distribution network of the embodiment of the present invention, many microgrids access strategy controls emulation platform.
Detailed description of the invention
Embodiment
In the power distribution network of the present embodiment, many microgrids access strategy controls emulation platform, including many microgrids model realization module, subscriber interface module, data transmission module, Load flow calculation module and control module; The signal output part of many microgrids model realization module is connected with the signal input part of subscriber interface module by data transmission module, the signal output part of subscriber interface module is connected with the signal input part of Load flow calculation module by data transmission module, the signal output part of Load flow calculation module is connected with the signal input part of the signal input part of subscriber interface module and control module respectively by data transmission module, and the signal output part controlling module is connected with the signal input part of the signal input part of Load flow calculation module and many microgrids pattern die respectively by data transmission module.
Many microgrids model realization module is used for building many microgrids model, and many microgrids model includes the sub-microgrid in microgrid and this microgrid, and microgrid is connected by unique and site with power distribution network, and microgrid is connected by unique access point with sub-microgrid;
Subscriber interface module is for carrying out Dynamic Announce to many microgrids model, and user interface has exercisable control by the operation of control completing the initialization of microgrid model, select the overall operation control model etc. of the initial operating state of microgrid, microgrid model parameter (such as node voltage, line transmission power and element numbers) and many microgrids. Allow users to observe operation conditions and the service data of micro-network control system, it is simple to operation analysis. Operable control includes following content:
The drop-down choice box of Network-choice, can be added different power distribution network network topology model on platform, and be selected by this control;
The drop-down choice box of Init-mode, optional microgrid initial operating state, design has optimalpowerflow on the platform: based on the economic operation model of optimal load flow, localbalance: under the state of emergency, Power Exchange is allowed between contiguous microgrid, carry out adjacent lines emergency DC power support, localfail: the following network failure of microgrid PCC node and circuit isolation, mainfail: the above network failure of microgrid PCC node and circuit isolation, MGisland: microgrid isolated power grid, MGsplitting: the internal parallel off of microgrid runs, mainrestoration: major network fault self-recovery process, localrestoration: local fault self-recovery process,
Commands is input command boxe, by control order, microgrid network structure and element can be regulated and controled parameter and be modified;
Setup, step, go, for running button, press setup and create selection microgrid structure, and step carries out a Load flow calculation and control decision circulation, and go power distribution network continuous service also can circulate change microgrid control decision continuously according to running status;
Network-layer, load-gen-layer, controller-layer, link-label are display choice box, select whether the element of corresponding each level in microgrid structure and parameter are shown in interface.
Controller-link is the drop-down choice box of communication network, including two kinds of forms of commands and monitor, commands is that under microgrid hierarchical control, the order of adjacent element is transmitted communication network by controller, and monitor is that localized network and adjacent element state are carried out the communication network of perception by controller.
The content that the optional Load flow calculation posterior nodal point of the drop-down choice box of Node-label, Load-Gen-label and load, DG side to show, including label, power and voltage three selection;
Data transmission module processes and transmission for many microgrids model realization module, subscriber interface module, Load flow calculation module, data summarization between communication module and control module;
Load flow calculation module is for carrying out Load flow calculation to many microgrids model, what tidal current computing method adopted is Z-bus method, namely Gaussian processes is adopted and with impedance matrix for Iterative Matrix, when many microgrids model changes, when disconnecting such as chopper, by data transmission module, changing unit being transferred to Load flow calculation module, Load flow calculation module will be modified accordingly;
Controlling module for many microgrids model being coordinated control, controlling module and including the load governor in the piconet controller in the central controller in microgrid, sub-microgrid, the micro-source controller in sub-microgrid and sub-microgrid;
Micro-source controller includes main micro-source controller and from micro-source controller;
As shown in Figure 2, central controller is for regulating the running status of microgrid, piconet controller is for the running status of regulon microgrid, main micro-source controller is for regulating the output voltage frequency of distributed power source, from micro-source controller for regulating the output of distributed power source, load governor is for the running status of load in regulon microgrid, remove central controller, every kind of controller is controlled by top level control device, but all there is certain independence, in time there is local runtime State Transferring, first local controller independently responds, according to running state conversion type, switching control pattern, then issuing top level control device in the state of this locality again, top level control device adjusts self control model according to the signal received and local runtime state again, when top controller monitors local runtime State Transferring time, top controller is made adjustment, the information such as required power shortage are handed down to lower floor's controller, lower floor's controller is according to local runtime state, the information such as the local power shortage needing and providing are provided, then issue successively again, last DG self exerts oneself according to the control information adjustment of its controller, load adjusts also according to its control signal received, namely whole multi-layer controller is not adopt traditional by central controller, entirety to be made control, but each controller is controlled based on local runtime state, owing to adopting hierarchical control, communication is there is between each controller, the coordination facilitating implementation microgrid controls, and each controller is controlled according to local network state operational mode, this makes controller have certain independence, add microgrid reliability of operation.
As shown in figs. 1 and 3, in power distribution network, many microgrids access strategy control emulation platform emulation mode is:
In a, described power distribution network, many microgrids access strategy control emulation platform calls many microgrids model realization module and builds many microgrids model;
In b, described power distribution network, many microgrids access strategy controls emulation platform and calls data transmission module and many microgrids model data is transferred to subscriber interface module carries out Dynamic Announce;
In c, described power distribution network, many microgrids access strategy controls emulation platform and calls data transmission module and many microgrids model data is transferred to Load flow calculation module carries out Load flow calculation;
In d, described power distribution network, many microgrids access strategy control emulation platform calls data transmission module and calculation of tidal current is transferred to subscriber interface module and control module, carries out Dynamic Announce and many microgrids model is coordinated to control;
E, described many microgrids model are coordinated control and are completed, and obtain described many microgrids model data and control the control data that module produces;
F, return c carry out Load flow calculation again.
This emulation platform also includes communication module, and communication module is for central controller, piconet controller, order between micro-source controller and load governor and status data transfers.
Many microgrids model realization module is netlogo, and data transmission module is matlab, and Load flow calculation module is opendss.
The present invention is not limited to above-described embodiment. All employings are equal to replaces the technical scheme formed, and all falls within the protection domain of application claims.
Claims (4)
1. in a power distribution network, many microgrids access strategy controls emulation platform, it is characterised in that: include many microgrids model realization module, subscriber interface module, data transmission module, Load flow calculation module and control module;
Described many microgrids model realization module is used for building many microgrids model;
Described subscriber interface module is for carrying out Dynamic Announce to described many microgrids model;
Described data transmission module processes and transmission for described many microgrids model realization module, subscriber interface module, Load flow calculation module, data summarization between communication module and control module;
Described Load flow calculation module is for carrying out Load flow calculation to described many microgrids model;
Described control module is for coordinating control to described many microgrids model;
The signal output part of described many microgrids model realization module is connected with the signal input part of described subscriber interface module by data transmission module, the signal output part of described subscriber interface module is connected with the signal input part of described Load flow calculation module by data transmission module, the signal output part of described Load flow calculation module is connected with the signal input part of the signal input part of described subscriber interface module and control module respectively by data transmission module, the signal output part of described control module is connected with the signal input part of described Load flow calculation module and the signal input part of many microgrids pattern die respectively by data transmission module.
2. in power distribution network according to claim 1, many microgrids access strategy controls emulation platform, it is characterized in that: described many microgrids model includes the sub-microgrid in microgrid and this microgrid, described microgrid is connected by unique and site with power distribution network, and described microgrid is connected by unique access point with described sub-microgrid;
Described control module includes the load governor in the piconet controller in the central controller in described microgrid, described sub-microgrid, the micro-source controller in described sub-microgrid and described sub-microgrid;
Described micro-source controller includes main micro-source controller and from micro-source controller;
Described central controller is for regulating the running status of described microgrid, described piconet controller is for regulating the running status of described sub-microgrid, the micro-source controller of described master is for regulating the output voltage frequency of described distributed power source, described from micro-source controller for regulating the output of described distributed power source, described load governor is for regulating the running status of load in described sub-microgrid.
3. in power distribution network according to claim 2, many microgrids access strategy controls emulation platform, it is characterized in that: also include communication module, described communication module is for described central controller, piconet controller, order between micro-source controller and load governor and status data transfers.
4. in power distribution network according to claim 3, many microgrids access strategy controls emulation platform, it is characterized in that: described many microgrids model realization module is netlogo, described data transmission module uses matlab to carry out data transmission, and described Load flow calculation module is opendss.
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| CN107591804A (en) * | 2017-09-22 | 2018-01-16 | 广东电网有限责任公司电力科学研究院 | A kind of electricity quality evaluation method and apparatus based on OPENDSS |
| CN112100802A (en) * | 2020-07-16 | 2020-12-18 | 国网江苏省电力有限公司南京供电分公司 | Multi-agent technology-based multi-energy flow system coordination optimization operation method |
| CN112260322A (en) * | 2020-10-10 | 2021-01-22 | 中国电力科学研究院有限公司 | Source network load storage simulation platform, method and system |
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Application publication date: 20160601 |