CN203826981U - Distributed generation connected controller - Google Patents
Distributed generation connected controller Download PDFInfo
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- CN203826981U CN203826981U CN201420067518.2U CN201420067518U CN203826981U CN 203826981 U CN203826981 U CN 203826981U CN 201420067518 U CN201420067518 U CN 201420067518U CN 203826981 U CN203826981 U CN 203826981U
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- Prior art keywords
- voltage
- phase
- power source
- distributed power
- current
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The utility model discloses a distributed generation connected controller comprising a power grid common connection point voltage detection unit, three phase voltage transformers, connecting electric reactors, a series connection current transformer, bus capacitors, a bus voltage detection unit, a parallel connection current transformer, a distributed power source voltage current detection unit, a touch screen display unit, and a system controller. The series connection current transformer and the parallel connection current transformer are connected with the bus capacitors through a combined busbar and the bus capacitors, and an output end of the series connection current transformer is connected with the three phase voltage transformers after being connected with the connecting electric reactors. A DSP signal processor is adopted as the system controller. Through the distributed generation connected controller, distributed generation can be improved in electric energy quality, and an electric power system can be improved in security and economic operation level.
Description
Technical field
The utility model belongs to power technology field, relates to a kind of control device of distributed power source access electrical network.
Background technology
Due to the relative deficiency of China's conventional energy resource supply and the raising day by day of environmental protection requirement, the development and utilization of regenerative resource has been subject to paying attention to widely.China has proposed the binding indicator of " energy-saving and emission-reduction " for developing " low-carbon economy ", the distributed power generation adapting with it (distributed generation, DG) technology has obtained national great attention and has been developed rapidly.Distributed power generation (DG) refers to: for meeting specific user's needs or supporting the economical operation of existing power distribution network, be arranged near user with distributing, generated output is the thousands of watts of small modules formulas that do not wait to tens of megawatts and the independent current source with environmental compatible.It is and the diverse novel powering mode of traditional concentration supply power pattern.Development distributed generation technology is the objective requirement of electricity generation system technological progress.The first, development distributed power generation is the inevitable choice that improves efficiency of energy utilization.The second, promoting distributed power generation is the inevitable choice of improving energy resource structure, and increase natural gas power, coal bed gas generating all need distributed generation technology, and improving regenerative resource ratio also needs distributed generation technology.The 3rd, the generating of development distributed energy is the necessary guarantee of energy security.
Distributed power source accesses the impact on distribution system:
It is no longer one-way flow that the access of DG makes the trend of each branch road in power distribution network; because the access meeting of DG brings deep effect to whole electric power system; again because various forms of DG technology itself still need further research and improve; so the angle being connected with traditional electrical network from DG, need to carry out deep research for a series of problems such as the trend distribution that contains DG, harmonic content, short circuit current, voltage stabilization, power scheduling, relaying protections.
(1) impact on distribution power flow.The form of tradition power distribution network is Radiation network, and system load flow direction is pointed to user side by power end.In the time accessing DG in power distribution network, the size and Orientation of system load flow will be subject to the impact of the factors such as DG on-position and capacity.For example wind-driven generator mostly is asynchronous generator, its operation needs electric power system to provide idle, so just increase the weight of the load or burden without work of electrical network, therefore needed to install reactive power compensator nearby, like this trend to power distribution network has been distributed and produces very important material impact.
(2) impact on distribution network electric energy quality.In the time that power distribution network operates in stable state situation, its voltage reduces gradually along direction of tide; On the one hand, when after DG access power distribution network, because distributed power source appears at user side, the regularity of distribution of steady state voltage will change.For example, because wind energy turbine set is main mainly with asynchronous generator, in the time that it is incorporated into the power networks, will cause the variation of System Reactive Power, thereby affect whole system voltage.On the other hand, DG device comprises power electronic device, and with inverting access power distribution network, also can cause the power quality problem such as flickering, fluctuation of voltage.In order to address these problems, can near DG, set up the filters such as filter, thereby reduce system harmonics content, improve system power quality.
(3) impact on power distribution network relaying protection.In traditional power distribution network; when system line breaks down; short circuit current is the unidirectional current that points to fault point from power end; because the protective device installed is one of them of directionless syllogic overcurrent protective device, inverse time over-current protector, distance protection equipment on main feeder, separately there is reclosing device again, so monitoring DG fault in real time; in the time of DG fault; must excise rapidly DG, make it depart from electrical network, ensure the safe operation of electrical network.
If before distributed power source is grid-connected, installation distributed power source connects net controller (distributed generation connected controller-DGCC) can be in effectively improving energy utilization rate and flexibility, ensure the safe and reliable operation of distribution network system, this is the key issue place of current DG large-scale application just.
Summary of the invention
The purpose of this utility model is to overcome distributed power source to access the adverse effect to power distribution network, provide a kind of distributed power source to connect net control device, it can the required reactive power of compensation network, and can carry out three-phase compensates respectively, make System Reactive Power in poised state, ensure the stable operation of electrical network various piece; And this device can also suppress the power quality problems such as voltage fluctuation, flickering, harmonic pollution.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of distributed power source connects net controller, comprise electrical network public access point voltage detection unit, three-phase transformer, linked reactor, series converter, bus capacitor, busbar voltage detecting unit, parallel converters, distributed power source electric current and voltage detecting unit, system controller, series converter is connected with bus capacitor by composite bus bar with parallel converters, series converter output is connected with three-phase transformer after being connected with linked reactor again, and described system controller adopts DSP signal processor; Described three-phase transformer adopts the mode of three-phase Y-connection; Described series converter adopts voltage control type inverter; Described distributed power source electric current and voltage detecting unit gathers three-phase voltage and the electric current of distributed power source, and three-phase voltage parameter is for the voltage compensation of electrical network public access point, and three-phase current parameter is for the harmonic current of filtering distributed power source.
Compared with prior art, the beneficial effects of the utility model are:
1) grid-connected current harmonic content is low: grid-connected current harmonic content meets the technical stipulation of State Grid Corporation of China about distributed power source access electrical network.
2) harmonic wave that can real-time tracking distributed power source voltage changes, and automatic stabilisation DC bus-bar voltage, has high controllability and fast-response.
3) can stablize electrical network public access point voltage, in the time that distributed power source voltage falls, also can not affect the voltage magnitude of electrical network public access point.
4) grid-connected current has high controllability, can ensure that grid-connected power factor is greater than 0.98.
5) use DSP high speed numerical processor, possess standard communication interface, Ethernet interface, standard MODBUS communications protocol.Also can use wireless base station communication modes for remote generating area, facilitate user to carry out remote automation management, can coordinate the network management of grid company, and implement the scheduling of fast and flexible, make electric network swim controlled, increase substantially fail safe and the flexibility of electric power system.
6) from the angle of stable DC busbar voltage; To control grid-connected power factor and harmonic content as target, can avoid the complex process of the meritorious idle component of detection system, simplify control procedure, improve reliability and the response speed of system, and be easy to realize.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram.
Fig. 2 is the control principle drawing of parallel converters.
Fig. 3 is the control principle drawing of series converter.
Fig. 4 is the control principle drawing of a certain phase in series converter.
Embodiment
Describe the technical solution of the utility model in detail below in conjunction with drawings and the specific embodiments.
With reference to Fig. 1, a kind of distributed power source access power grid control device, this device comprises electrical network public access point voltage detection unit 1, three-phase transformer T1, T2, T3, linked reactor L1, L2, L3, series converter 2, bus capacitor C1, C2, busbar voltage detecting unit 7, parallel converters 3, distributed power source electric current and voltage detecting unit 4, touch screen display unit 5, system controller.Series converter 2 is connected with bus capacitor C1, C2 by composite bus bar with parallel converters 3, after series converter 2 outputs are connected with linked reactor L1, L2, L3, is connected with three-phase transformer T1, T2, T3.System controller unit adopts DSP signal processor.
Wherein, electrical network public access point voltage detection unit 1: for gathering electrical network public access point voltage signal U
sys;
Series converter unit 2: according to the compensation voltage signal U calculating
ctrl, produce corresponding bucking voltage at transformer T1, T2, the T3 secondary of three-phase Y-connection, and feed back to the three-phase output current I of electrical network
cl;
Parallel converters unit 3: for compensation harmonic electric current, the harmonic wave that filtering distributed power source produces, Simultaneous Stabilization busbar voltage, wherein the control signal of offset current is I
ctrl, the current transformer three-phase output current that feeds back to electrical network is I
bl, this unit is stablized the function of busbar voltage in addition, and the busbar voltage that feeds back to electrical network is U
dc;
Distributed power source electric current and voltage detecting unit 4: for Real-time Collection distributed power source electric current and voltage data, wherein three-phase voltage is U
abc, three-phase current is I
abc, and set it as the control foundation of parallel converters unit;
Touch screen display unit 5: for on-the-spot human-computer dialogue, show in real time the relevant information such as energy output and the quality of power supply;
Wireless base station communication unit 6: for remote districts or cannot the distributed power generation device of accessing Internet and the communication in Utilities Electric Co. control room;
The control method of distributed power source access control apparatus is divided into parallel converters part and a series converter part, comprises respectively following steps:
With reference to Fig. 2, comprise the following steps for parallel converters part:
Step 1, gathers the three-phase voltage signal of distributed power source, is respectively U
a, U
b, U
c, be then sent to digital phase-locked loop, obtain identical with distributed power source three-phase voltage phase place, the sinusoidal signal that amplitude is 1;
Step 2, by current bus voltage value U
dcbe sent to low pass filter, the set-point of DC bus-bar voltage is set in to V
ref, and this value is compared and tries to achieve difference with bus voltage value after filtering, then send difference to pi regulator, and then be sent to amplitude limit link;
Step 3, by the output valve of amplitude limit link in the sinusoidal signal obtaining in step 1 and step 2 through multiplier processing, then will be through multiplier output current value after treatment and distributed power source three-phase current I
a, I
b, I
csubtract each other, obtain the three-phase current instruction of parallel converters
described above process is all that three-phase carries out respectively;
Step 4, by the three-phase current instruction obtaining in step 3
send the stagnant ring controller of three-phase current to, generate the control signal of three brachium pontis six pulses, the stagnant ring controller energy of described three-phase current Real-time Feedback three-phase output current, and ensure that three-phase current instruction waveform equates with feedback current;
The total data of the 50Hz sine wave that described digital phase-locked loop is 1 by amplitude is converted to the sinusoidal wave array of 400 elements, and hold it in program, then send the voltage signal of input to zero-crossing comparator and obtain square-wave signal, then set timer, in the time that the rising edge of square-wave signal arrives, trigger timer zero clearing.In the time of control program access digital phase-locked loop, phase-locked loop is according to the numerical value of timer, takes out the output as digital phase-locked loop of corresponding element in sinusoidal wave array.
With reference to Fig. 3, comprise the following steps for series converter part:
Step 1, gathers electrical network three-phase voltage signal U by electrical network public access point three-phase voltage detecting unit 1
a, U
b, U
c;
Step 2, gathers distributed power source three-phase voltage signal U by distributed power source three-phase voltage current detecting unit 4
aS, U
bS, U
cS;
Step 3, deducts the voltage signal of step 2 with the voltage signal of step 1, obtain the three-phase voltage instruction of voltage compensation
Step 4, for convenience of explanation, gets and a certainly in series converter describes mutually, with reference to Fig. 4, the three-phase voltage instruction obtaining in step 3 is got to the wherein instruction U of a phase
*compare with the voltage of three-phase transformer output, and result is relatively sent to pi regulator, then after stagnant ring controller is processed, obtain the control impuls of current transformer, the control method of other two-phase is identical with said method;
The above; it is only preferably embodiment of the utility model; protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall in protection range of the present utility model.
Claims (1)
1. a distributed power source connects net control device, it is characterized in that, comprise electrical network public access point voltage detection unit, three-phase transformer, linked reactor, series converter, bus capacitor, busbar voltage detecting unit, parallel converters, distributed power source electric current and voltage detecting unit, system controller, series converter is connected with bus capacitor by composite bus bar with parallel converters, series converter output is connected with three-phase transformer after being connected with linked reactor again, and described system controller adopts DSP signal processor; Described three-phase transformer adopts the mode of three-phase Y-connection; Described series converter adopts voltage control type inverter; Described distributed power source electric current and voltage detecting unit gathers three-phase voltage and the electric current of distributed power source, and three-phase voltage parameter is for the voltage compensation of electrical network public access point, and three-phase current parameter is for the harmonic current of filtering distributed power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067518.2U CN203826981U (en) | 2014-02-13 | 2014-02-13 | Distributed generation connected controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420067518.2U CN203826981U (en) | 2014-02-13 | 2014-02-13 | Distributed generation connected controller |
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|---|---|
| CN203826981U true CN203826981U (en) | 2014-09-10 |
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|---|---|---|---|
| CN201420067518.2U Expired - Fee Related CN203826981U (en) | 2014-02-13 | 2014-02-13 | Distributed generation connected controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795082A (en) * | 2014-02-13 | 2014-05-14 | 辽宁立德电力电子股份有限公司 | Device and method for controlling distributed power supply to be connected to power grid |
-
2014
- 2014-02-13 CN CN201420067518.2U patent/CN203826981U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795082A (en) * | 2014-02-13 | 2014-05-14 | 辽宁立德电力电子股份有限公司 | Device and method for controlling distributed power supply to be connected to power grid |
| CN103795082B (en) * | 2014-02-13 | 2015-09-09 | 辽宁立德电力电子股份有限公司 | A kind of distributed power source connects net controller and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Yuliang Inventor after: Dong Fengyu Inventor after: Guo Chunxiang Inventor after: Hao Jun Inventor after: Guan Wei Inventor after: Zhang Sanyong Inventor after: Guo Hongyue Inventor after: Li Tan Inventor after: Zhang Jinming Inventor after: Liu Yang Inventor after: Chen Mingfei Inventor before: Zhang Yuliang Inventor before: Dong Fengyu Inventor before: Zhu Dan Inventor before: Chen Mingfei Inventor before: Zhang Rui Inventor before: Guo Hongyue Inventor before: Lv Haiyan Inventor before: Guo Chunxiang Inventor before: Ma Zhenku Inventor before: Sun Guorong Inventor before: Zhang Jinming Inventor before: Li Yulin Inventor before: Liu Yang Inventor before: Li Tan Inventor before: Guan Wei Inventor before: Zhang Sanyong |
|
| COR | Change of bibliographic data | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20180213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |