CN203218894U - Multi-path high-precision reverse-power control system - Google Patents
Multi-path high-precision reverse-power control system Download PDFInfo
- Publication number
- CN203218894U CN203218894U CN 201320158614 CN201320158614U CN203218894U CN 203218894 U CN203218894 U CN 203218894U CN 201320158614 CN201320158614 CN 201320158614 CN 201320158614 U CN201320158614 U CN 201320158614U CN 203218894 U CN203218894 U CN 203218894U
- Authority
- CN
- China
- Prior art keywords
- power
- reverse
- collection module
- inverter
- inverse probability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model discloses a multi-path high-precision reverse-power control system and a reverse-power protective control method. The multi-path high-precision reverse-power control system comprises a power collection module and a reverse-power control module, wherein the power collection module is arranged on a connection point of a local electric network and a public electric network, the reverse-power control module is respectively connected with the power collection module and a plurality of inverters which is provided with remote power-control interfaces by communication lines, the reverse-power control module comprises a touch screen having a man-machine interaction function, the touch screen is provided with a controller for storing and executing power control strategies, the power collection module collects power values with direction information on the connection point, and the reverse-power control module transmits control instructions to the inverters based on the power values to precisely adjust output power of the inverters. The reverse-power provide apparatus provided by the utility model has the advantages of high control precision, simple structure, stable and reliable performance, friendly interface, convenient operation, low cost and convenient installation.
Description
Technical field
The utility model relates to the photovoltaic field, is specifically related to a kind of duplex high precision inverse probability control system.
Background technology
Grid-connected power generation system such as photovoltaic have large-scale ground power station and the low-pressure side two kinds of forms in power station of generating power for their own use usually.Wherein the low-pressure side photovoltaic plant of generating power for their own use is one of emphasis direction of present national policy guiding.Because the distributed access of these new forms of energy is not considered the time in the electrical network design, much the owner unit in this type of power station of generating power for their own use can not with generate electricity and can directly send into electrical network, can only supply local load consumption.When local load can't these electric energy of full consumption, need there be technological means to limit the power output in this class new forms of energy power station, guarantee that the electrical network energy is from net side loading side flow, reverse flow that can not emergent power.
Had some reverse power protection system or control system at present, these systems all exist various problems to make the application of himself be subjected to various restrictions, and the concrete problem that exists is as follows:
System configuration complexity, function singleness, poor reliability.The similar system that exists is generally the design of circuit level at present.Because the running environment complexity in new forms of energy power station is various, may have disturbing factors such as electric current and voltage distortion and surge, flickering.The stability that such device moves under this environment and precision are difficult to guarantee.In case and reverse power protection/control system itself goes wrong, the safety of operation of power networks will be had a strong impact on.May have equipment such as PC in the system, PC itself is made of a plurality of parts, and reliability also is not suitable as the crucial control assembly in whole power station.
The control method of existing system is extensive, and cost is very high.When occurring or be about to inverse probability occur in system usually, existing reverse power protection system directly inverter distributed power supply is excised from electrical network.Along with technological progress, the power of existing inverter/distributed power source is increasing, directly it is had very big influence from power and voltage stability that electrical network excises partial electric grid, causes power oscillation or the frequency anomaly of electrical network probably.And inverter/distributed power source runs on when more high-power and dangerous operating modes such as overvoltage may be occurred by excision suddenly, this life-span to generating equipment itself also can be caused harmful effect, will obviously influence the rate of return on investment in whole power station in case equipment breaks down.And the existing scheme of part to adopt extra switching device that inverter/distributed power source is excised the cost of these devices own from electrical network very high, this also causes adverse effect to cost and the rate of return on investment in power station.
Because existing scheme all is whether the operation with inverter/distributed power source be the method for power control, when the single-machine capacity of inverter/distributed power source itself than greatly the time, the switching of any equipment all means very powerful variation.For instance, suppose that power station that one of a certain moment is equipped with 4 500kW inverters can export the power of 1800kW, and 4 inverter power output basically identicals.Local load at that time has only 1700kW, so there is the inverse probability phenomenon in system, and existing scheme will directly be excised an inverter, and then the power output in power station becomes 1800/4*3=1350kW.Electrical network will this be a very big power to local load power supply 1700-1350=350kW subsequently, also means many electricity charge.Therefore the new forms of energy power station is not fully utilized.
The utility model content
Technical problem to be solved in the utility model is to solve existing inverse probability control system complex structure, function singleness, poor reliability, and control method is simply extensive, the cost problem of higher.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts provides a kind of duplex high precision inverse probability control system, comprise several power collection modules and inverse probability control module, described power collection module is arranged on the tie point of local power grid and public electric wire net, described inverse probability control module is connected with some inverters with long-range power control interface with power collection module respectively by communication line, described inverse probability control module comprises the touch-screen with human-computer interaction function, described touch-screen is provided with storage and transmits the controller of control strategy, described power collection module is gathered the magnitude of power that has directional information on the described tie point, accurately adjusts its power output thereby described inverse probability control module sends control command according to this magnitude of power to described inverter.
In above-mentioned duplex high precision inverse probability control system, also be provided with contactor between described inverter and the local power grid, described contactor is connected with described power collection module by auxiliary relay, the start and stop of inverter when the switching value of described power collection module exports described contactor to and realizes native system miscellaneous part operation irregularity.
Advantages such as the reverse power protection device that the utility model provides has the control precision height, and is simple in structure, stable and reliable for performance, and friendly interface is convenient to operation, and is with low cost, easy for installation.
Description of drawings
Fig. 1 provides the structural representation of the inverse probability control system of usefulness for the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is made detailed explanation.
As shown in Figure 1, a kind of duplex high precision inverse probability control system that the utility model provides comprises several power collection modules and inverse probability control module, power collection module is arranged on the points of common connection of local power grid and public electric wire net, the inverse probability control module is connected with some inverters with long-range power control interface with power collection module respectively by communication line, the inverse probability control module comprises the touch-screen with human-computer interaction function, touch-screen is provided with storage and transmits the controller of control strategy, and the inverse probability control module also comprises accessory power supply and the transformer for power supply.Power collection module is gathered the magnitude of power that has directional information on the described tie point, accurately adjusts its power output thereby the inverse probability control module sends control command according to this magnitude of power to inverter.Also be provided with contactor between inverter and the local power grid, contactor is connected with power collection module by auxiliary relay, and the two connects by switch signal line, the start and stop of inverter when the switching value of power collection module exports contactor realization native system miscellaneous part operation irregularity to.
Inverter is the executive component of system, the inverter that is applied to native system should have long-range power control interface, by this control interface, the inverse probability control module can send the power output upper limit that order limits inverter, and start and stop inverter as required.
The inverse probability control module is the core of native system, also is the man-machine interactive platform of native system.The inverse probability control module need have enough communication interfaces and be used for connecting power collection module and inverter, and self need have the memory space of enough capacity so that the storage power control strategy.
Power collection module is the feedback element of native system, adopts the standard electric power collection module in this programme.This acquisition module need have communication interface, and can export the magnitude of power that institute's line attachment has directional information.And this module need have the switching value output function, can the switching value output function be set by the power limit trigger action through communication interface.
Contactor or other intimate devices (for example can electricity behaviour circuit breaker) be selectable unit (SU).Its function makes system power uncontrollable for preventing inverse probability control module or inverter operation irregularity.Or when system was required that absolute assurance inverse probability do not occur, contactor can excise whole inverters immediately by the direct control of power collection module, the operation that progressively recovers each inverter again after situation is stable when tripping operation or similar power acute variation appearred in load.
Inverter in the system (more than one usually) is connected to the local power grid at load place by contactor.If owner unit has the power supply of more than one road power supply, then power collection module also increases correspondence, no matter the new forms of energy power station all can operate as normal when guaranteeing the power supply power supply of which road.Inverter can be multiple new forms of energy inverters such as photovoltaic, wind energy, tidal energy, and namely native system can be applied to multiple generation of electricity by new energy fields such as photovoltaic, wind energy, tidal energy.
The magnitude of power at points of common connection place will be sent to the inverse probability control module by power collection module during system works, and inverter also can transfer to self power situation the inverse probability control module simultaneously.The inverse probability control module receives the power output higher limit that is sent to inverter after these data according to control strategy adjustment circulation.Guarantee that with this given summation of power output (Pout) of whole inverters equals present load power (PL) and power buffer value P ε sum, following relation is namely arranged during systematic steady state.
Pout≤PL+Pε
Wherein P ε can arrange at the interface of reverse power protection module, and value is 5% of new forms of energy power station gross power usually.
The reverse power protection control method of reverse power protection module has two kinds of alternative modes, is respectively:
First kind of control model, at first adjust the power output higher limit of an inverter, keep other inverters to be in the peak power output state, limit to zero the time when the power of this inverter it is shut down, limit the power output of next inverter subsequently successively, power recovery process in contrast;
Second kind of control model adjusted the power output higher limit of whole inverters simultaneously, and each inverter remains essentially identical power output.
When inverse probability, can arrange each inverter to be in underloading or stopped status in turn for first kind in these two kinds of control strategies, protect the life-span of inverter apparatus to the full extent.Second kind of strategy is best to the speed of following that bearing power changes, than being more suitable for the frequent occasion that occurs than great fluctuation process of load.
The feature of the utility model maximum is the control precision height, and the power output that can control this device institute linchpin inverter is in any percentage place of power output under the not control situation.In conjunction with the points of common connection place power information that power collection module obtains, this device can be controlled the power accurate balance of electricity generation system and local load.Assurance the inverse probability phenomenon do not occur and takes full advantage of the generating capacity in new forms of energy power station.
Describe execution mode of the present utility model in detail below in conjunction with instantiation:
Two 100kW inverters insert local power grid by contactor, and the power harvester in the inverse probability control device is the EDA9033D of Shandong Lichuang Technology Co., Ltd..The inverse probability control module is the TPC7062K of Beijing Kunlun Tongtai Automation Software Technology Co., Ltd..Because inverter and points of common connection distance are very near, power collection module and inverse probability control module are installed in the same casing (calling the inverse probability control cabinet in the following text).Box house also comprises auxiliary equipments such as transformer, accessory power supply.Inverter is connected to the inverse probability control cabinet by 485 buses, sends in the touch-screen after being converted to 232 signals, and power collection module is directly sent into 485 interfaces that touch-screen carries by 485 buses.The switching value delivery outlet of power collection module is connected to contactor.Its signal is associated on the power collection module power defencive function, and the protection restriction is made as 0W.
When bearing power during greater than 200kW, be limited to 100% in the control inverter power output all the time of inverse probability control system.
When bearing power was down to 120kW, the state of system was as follows under first, second two kinds of control models:
Pattern one: the power output restriction of inverter first is set to (120kW-inverter second present output power);
Pattern two: the power output of inverter first and inverter second all is set to 60%
When bearing power was down to 90kW, the state of system was as follows under first, second two kinds of control models:
Pattern one: the inverter first is shut down, and the power output restriction of inverter second is set to 90%;
Pattern two: the power output of inverter first and inverter second all is set to 45%.
The selection of above inverter first should be obeyed randomly assigne, thereby the working life that can guarantee to add up two inverters of angle is basic identical.
The reverse power protection device that the utility model provides has plurality of advantages, and is specific as follows:
Simple in structure, have only few parts to form in the device, this means that system failure point is few, the reliability height;
Stable and reliable for performance, be standard electric power meter scale because system directly links to each other partly with electrical network, the system that guaranteed has good interference free performance and certainty of measurement, has avoided designing voluntarily the hidden danger that sample circuit may exist.Even simultaneously optional contactor can guarantee that unusually also can the inverse probability phenomenon be protected appears in system, greatly improved the controllability of inverse probability control;
Friendly interface is because system adopts normal touch screen to be easy to design friendly interface.Compare the traditional relay protection device, the design is convenient to system employs attendant's operation and is checked very much;
With low cost, because system need not to adopt PC or other equipment for customizing, only need lower cost can realize the function of similar protection system;
Easy for installation, the equipment of selecting in the system all has smaller volume, and install at this scene of being convenient to very much equipment, and can not bring excessive change to original system.
The utility model adopts simple and reliable relatively parts to realize the control of system's power output, and the assurance system the inverse probability state can not occur.Adopt advanced control method and means, realize system power level and smooth control in time, in order to follow new forms of energy (illumination, wind energy, morning and evening tides etc.) variation of exerting oneself and the variation of local bearing power, dynamically guarantee system power balance and not emergent power reverse flow.And design the accurate more control algolithm of a cover, and make the generating capacity in new forms of energy power station be fully used as far as possible, accelerate power station investment repayment speed, improve income.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.
Claims (2)
1. duplex high precision inverse probability control system, it is characterized in that, comprise several power collection modules and inverse probability control module, described power collection module is arranged on the tie point of local power grid and public electric wire net, described inverse probability control module is connected with some inverters with long-range power control interface with power collection module respectively by communication line, described inverse probability control module comprises the touch-screen with human-computer interaction function, described touch-screen is provided with storage and carries out the controller of power control strategy, described power collection module is gathered the magnitude of power that has directional information on the described tie point, accurately adjusts its power output thereby described inverse probability control module sends control command according to this magnitude of power to described inverter.
2. a kind of duplex high precision inverse probability control system as claimed in claim 1, it is characterized in that, also be provided with contactor between described inverter and the local power grid, described contactor is connected with described power collection module by auxiliary relay, the start and stop of inverter when the switching value of described power collection module exports described contactor to and realizes native system miscellaneous part operation irregularity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158614 CN203218894U (en) | 2013-04-01 | 2013-04-01 | Multi-path high-precision reverse-power control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158614 CN203218894U (en) | 2013-04-01 | 2013-04-01 | Multi-path high-precision reverse-power control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203218894U true CN203218894U (en) | 2013-09-25 |
Family
ID=49208397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320158614 Expired - Fee Related CN203218894U (en) | 2013-04-01 | 2013-04-01 | Multi-path high-precision reverse-power control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203218894U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104115A (en) * | 2013-04-01 | 2014-10-15 | 北京格林科电技术有限公司 | Multichannel high-accuracy reverse power control system and reverse power protection control method |
-
2013
- 2013-04-01 CN CN 201320158614 patent/CN203218894U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104115A (en) * | 2013-04-01 | 2014-10-15 | 北京格林科电技术有限公司 | Multichannel high-accuracy reverse power control system and reverse power protection control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Alkahtani et al. | Power quality in microgrids including supraharmonics: Issues, standards, and mitigations | |
| Al-Shetwi et al. | A review of the fault ride through requirements in different grid codes concerning penetration of PV system to the electric power network | |
| Joos | Wind turbine generator low voltage ride through requirements and solutions | |
| CN104995812A (en) | A method of operating a wind turbine plant | |
| CN103004050A (en) | Method and control arrangement for controlling central capacitors in wind power plants | |
| CN105549420A (en) | Real-time simulation test method of direct-driving draught-fan variable flow control system | |
| Anzalchi et al. | Power quality and voltage profile analyses of high penetration grid-tied photovoltaics: A case study | |
| CN104836236A (en) | Distribution panel for stand-alone micro-grid | |
| Kumar et al. | Utility of SCADA in power generation and distribution system | |
| CN104104115A (en) | Multichannel high-accuracy reverse power control system and reverse power protection control method | |
| CN103746389A (en) | Reactive compensation configuration method based on reactive voltage feature for wind power 500kV collecting transformer substation | |
| CN204179684U (en) | Wind turbine generator fault traversing device | |
| CN103532224B (en) | A kind of UPS collocation method of marine wind electric field | |
| Camm et al. | Solar power plant design and interconnection | |
| CN104734165A (en) | Reactive power control method for low voltage ride-through of full-power converter of wind generation set | |
| CN105591371A (en) | Anti-islanding protection control system and anti-islanding protection control method based on photovoltaic power station power control system | |
| CN102868178A (en) | Method for improving grid-connected transient stability in wind power plant voltage automatic control system | |
| CN105445580A (en) | Test method of reactive power compensation device response time | |
| CN203261029U (en) | Power grid grounding compensation device based on arc suppression transformer | |
| CN104716635B (en) | Suitable for grid-connected and islet operation microgrid integrated technical reformation method | |
| CN203312828U (en) | Microgrid coordinated control system | |
| CN203218894U (en) | Multi-path high-precision reverse-power control system | |
| CN101783513A (en) | Wind energy converter, wind energy generating equipment and system | |
| US8175755B2 (en) | Systems and methods for monitoring power devices | |
| CN202840496U (en) | Wind electricity grid relay protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20160401 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |