CN103197131B - Performance test system for photovoltaic power generation system - Google Patents
Performance test system for photovoltaic power generation system Download PDFInfo
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- CN103197131B CN103197131B CN201210001207.1A CN201210001207A CN103197131B CN 103197131 B CN103197131 B CN 103197131B CN 201210001207 A CN201210001207 A CN 201210001207A CN 103197131 B CN103197131 B CN 103197131B
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- 238000010248 power generation Methods 0.000 title abstract description 9
- 238000011056 performance test Methods 0.000 title abstract 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000004308 accommodation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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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
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Abstract
The invention provides a performance test system for a photovoltaic power generation system. The performance test system for the photovoltaic power generation system comprises the photovoltaic power generation system, a current transformer, a voltage tracking device, an electric power system model and a 380V power supply system, wherein the photovoltaic power generation system is connected to the 380V power supply system through the voltage tracking device, and the voltage tracking device transmits electric energy generated by the photovoltaic power generation system to the 380V power supply system; the current transformer obtains current signals output by the photovoltaic power generation system, and inputs the current signals to the electric power system model; the electric power system model simulates an electrical environment, converts the received current signals to voltage signals, and outputs the voltage signals to the voltage tracking device; and the voltage tracking device detects the performance of a photovoltaic power station according to the received voltage signals. Through the performance test system for the photovoltaic power generation system, the performance of the photovoltaic power station can be effectively and accurately detected.
Description
Technical field
The present invention relates to electric system, particularly, relate to a kind of performance detecting system of photovoltaic generating system.
Background technology
The research method that current photovoltaic plant is relevant can be obtained by site test, also can by corresponding simulation software simulation calculation, and the former limits by technical conditions, scale, and the confidence level of the latter's result of calculation depends on the correctness of realistic model.And current photovoltaic power generation system model is principle model mostly, emulated data and field test data degree of fitting poor.
That is, the performance how detecting photovoltaic plant is effectively and accurately the problem urgently needing at present to solve.
Summary of the invention
The fundamental purpose of the embodiment of the present invention is the performance detecting system providing a kind of photovoltaic generating system, to solve the problem that cannot detect photovoltaic plant performance in prior art effectively and accurately.
To achieve these goals, the embodiment of the present invention provides a kind of performance detecting system of photovoltaic generating system, this system comprises: photovoltaic generating system, current transformer, voltage-tracing device, electric power system model and 380V electric power system, wherein, described photovoltaic generating system is linked into 380V electric power system via described voltage-tracing device, and the electric energy that described photovoltaic generating system produces is delivered to described 380V electric power system by described voltage-tracing device; Described current transformer obtains the current signal that described photovoltaic generating system exports, and described current signal is inputed to described electric power system model; Described electric power system model simulation electric circumstance, and export described voltage-tracing device to after the current signal of reception is changed into voltage signal; Described voltage-tracing device detects the performance of described photovoltaic generating system according to the voltage signal received;
Described voltage-tracing device comprises: the first AC/DC converter, second AC/DC converter, DC voltage-stabilizing electric capacity and control section, described first AC/DC converter is connected with described photovoltaic generating system, described second AC/DC converter is connected with described 380V electric power system, described first AC/DC converter is connected by described DC voltage-stabilizing electric capacity with the second AC/DC converter, described control section respectively with the first described AC/DC converter, second AC/DC converter connects, described control section receives the voltage signal from described electric power system model, and described voltage signal is converted into start pulse signal, to control conducting and the cut-off of each brachium pontis in described first AC/DC converter and the second AC/DC converter.
Three-phase alternating current cable is used to be connected between described voltage-tracing device and described 380V electric power system.
Three-phase alternating current cable is used to be connected between described voltage-tracing device and described photovoltaic generating system.
Coax signal cable is used to be connected between described voltage-tracing device and described electric power system model.
Coax signal cable is used to be connected between described current transformer and described electric power system model.
Described electric power system model is realized by RTDS.
By means of technique scheme, convert voltage signal to after the electric circumstance of being simulated via electric power system model by the current signal of photovoltaic generating system and export voltage-tracing device to, make voltage-tracing device can detect the performance of photovoltaic generating system according to the voltage signal received.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of the photovoltaic generating system performance detecting system according to the embodiment of the present invention;
Fig. 2 is the structured flowchart of the voltage-tracing device according to the embodiment of the present invention;
Fig. 3 is the circuit diagram of the voltage-tracing device according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the photovoltaic generating system access electric power system model according to the embodiment of the present invention;
Fig. 5 is the simplified diagram of the photovoltaic generating system access electric power system model based on Fig. 4.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Owing to cannot detect the performance of photovoltaic plant at present effectively and accurately, based on this, the embodiment of the present invention provides a kind of performance detecting system of photovoltaic generating system, to solve the problem.Below in conjunction with accompanying drawing, the present invention is described in detail.
Fig. 1 is the structured flowchart of photovoltaic generating system performance detecting system, and as shown in Figure 1, this performance detecting system comprises:
Photovoltaic generating system 1, current transformer 2, voltage-tracing device 3, electric power system model 4 and 380V electric power system 5, wherein, photovoltaic generating system is linked into 380V electric power system via voltage-tracing device, and the electric energy that photovoltaic generating system produces is delivered to 380V electric power system by voltage-tracing device; Current transformer obtains the current signal that photovoltaic generating system exports, and current signal is inputed to electric power system model; Electric power system model simulation electric circumstance, and export voltage-tracing device to after the current signal of reception is changed into voltage signal; Voltage-tracing device detects the performance of photovoltaic plant according to the voltage signal received.
As seen from the above description, convert voltage signal to after the electric circumstance of being simulated via electric power system model by the current signal of photovoltaic generating system and export voltage-tracing device to, make voltage-tracing device can detect the performance of photovoltaic generating system according to the voltage signal received.
In the specific implementation, can adopt real time data display, such as RTDS realizes above-mentioned electric power system model.Set up electric system Equivalent Model by RTDS, for the electric circumstance of simulated light photovoltaic generating system access, this electric system Equivalent Model can experimentally build in specific requirement.
Particularly, Fig. 2 is the structured flowchart of above-mentioned voltage-tracing device, as shown in Figure 2, voltage-tracing device 3 comprises: the first AC/DC converter 31, second AC/DC converter 32, DC voltage-stabilizing electric capacity 33 and control section 34, first AC/DC converter is connected with photovoltaic generating system, second AC/DC converter is connected with 380V electric power system, first AC/DC converter is connected by DC voltage-stabilizing electric capacity with the second AC/DC converter, control section respectively with the first AC/DC converter, second AC/DC converter connects, control section receives the voltage signal from electric power system model, and voltage signal is converted into start pulse signal, to control conducting and the cut-off of each brachium pontis in the first AC/DC converter and the second AC/DC converter.
In practical operation, the circuit diagram of voltage-tracing device can be as shown in Figure 3, this device is formed primarily of two IGBT AC/DC converter, DC voltage-stabilizing electric capacity and control section, and two AC/DC converter are connected by DC voltage-stabilizing electric capacity thus isolated in photovoltaic generating system side and 380V distribution system side alternating voltage.The voltage signal that photovoltaic generating system top-cross stream voltage-tracing real-time emulation system exports.In figure 3, the control section of voltage-tracing device accepts the voltage command signal sent by real time data display (RTDS), be converted into the start pulse signal of each brachium pontis of current transformer as calculated afterwards, thus control conducting and the cut-off of each brachium pontis, the three-phase alternating voltage of trace command voltage signal is produced at voltage output end, detect the performance of photovoltaic generating system according to the change of this three-phase alternating voltage, namely what in Fig. 3, VSG voltage output end exported is three-phase alternating voltage.
Above-mentioned 380V electric power system is connected with three-phase alternating current cable with between voltage-tracing device, and electric energy is sent to 380V electric power system by voltage-tracing device.Voltage-tracing device is connected with three-phase alternating current cable with between photovoltaic generating system, and electric energy is sent to voltage-tracing device by photovoltaic generating system; The current signal that photovoltaic generating system sends to RTDS is by the current transformer collection of installing between photovoltaic generating system and voltage-tracing device and be converted to voltage signal, sends into RTDS through coax signal cable; The voltage command signal that RTDS sends to voltage-tracing device, is occurred by RTDS, sends into voltage-tracing device through coax signal cable.
The practical power systems capacity accessed in it due to the capacity relative of photovoltaic generating system is very little, therefore concerning photovoltaic generating system, the practical power systems of its access can regard a voltage source as, and concerning practical power systems, photovoltaic generating system can be regarded as a current source to its Injection Current.Fig. 4 is the schematic diagram of photovoltaic plant access electric power system model, in a model, the current signal that the photovoltaic generating system that controllable current source control signal and above-mentioned current transformer obtain exports, this controllable current source is used for simulated light photovoltaic generating system in digital simulation model, this controllable current source control signal introduces RTDS from actual light photovoltaic generating system outlet CT, the characteristic of actual light photovoltaic generating system can be reflected, the voltage signal in model, photovoltaic generating system being accessed bus PT exports from RTDS, sends into voltage-tracing device.When in RTDS during the various operating mode of analog electrical Force system (such as line fault, vibration, frequency jitter etc.), namely, for actual light photovoltaic generating system simulate an electric system overall situation time, the change in voltage of voltage-tracing device trace model median generatrix in real time, thus the performance detecting photovoltaic generating system according to change in voltage situation.
Particularly, the system model shown in composition graphs 4, photovoltaic generating system test event can have following several:
1. voltage ripple of power network.That is, in electric system, simulated light photovoltaic generating system accesses the voltage fluctuation of bus, and voltage-tracing device detects photovoltaic generating system to the accommodation of voltage fluctuation;
2. mains frequency fluctuation.That is, in electric system, the electric voltage frequency of simulated light photovoltaic generating system access bus fluctuates, and voltage-tracing device detects the accommodation that photovoltaic generating system fluctuates to electric voltage frequency;
3. electrical network three-phase voltage asymmetry.That is, in electric system, simulated light photovoltaic generating system accesses the asymmetrical voltage of bus, and voltage-tracing device detects photovoltaic generating system to the accommodation of asymmetrical voltage;
4. grid voltage sags.That is, in electric system, simulated light photovoltaic generating system accesses the Voltage Drop of bus, and voltage-tracing device detects photovoltaic generating system to the accommodation of Voltage Drop.
For detection of grid frequency jitter project, the embodiment of the present invention is described below.
Photovoltaic generating system, voltage-tracing device, 380V electric power system, real time data display (as RTDS), current transformer are connected as shown in Figure 1, in RTDS, build realistic model as shown in Figure 4, then in Fig. 4, electric system part can be built by simplifying in Fig. 5 electric power system model, in adjustment Fig. 5, genset is exerted oneself and load, genset is exerted oneself and is less than load, then can simulating grid frequency reduce, otherwise can simulating grid frequency raise.When in normal range of operation, (mains frequency is 49.9 ~ 50.1Hz under normal circumstances) changes mains frequency, photovoltaic generating system should be able to normally work.The test result of voltage-tracing device shows, this photovoltaic generating system can normally work when mains frequency changes between 49.9 ~ 50.1Hz under normal circumstances, and in power grid accident situation, when mains frequency fluctuates between 49.5 ~ 50.5Hz, this photovoltaic generating system control system is taken measures, and can not run by off-grid.
As seen from the above description, electric system Equivalent Model is set up by RTDS, be used for simulating the electric circumstance of actual light photovoltaic generating system access, the temporary of actual photovoltaic generating system is reflected in the model with controlled current source, stable state behavior, the current controling signal of controlled current source is followed the tracks of actual light photovoltaic generating system and is sent electric current, the voltage signal of this model controlled current source access bus is sent into voltage-tracing device, the interface voltage of this voltage-tracing device and photovoltaic generating system follows the tracks of the voltage command signal of RTDS, thus go out to access power system environment for photovoltaic generating system real time modelling, then suitable simulated environment is obtained by the reference value representated by each signal of adjustment, RTDS, voltage-tracing device and photovoltaic generating system just form closed test environment, the change of the voltage received by voltage-tracing device detects the performance of photovoltaic generating system.
The embodiment of the present invention can directly be studied for the photovoltaic generating system of certain reality, the accuracy of emulated data is higher, pass through the embodiment of the present invention, the problem that cannot detect photovoltaic plant performance effectively and accurately of the prior art can be overcome, thus photovoltaic plant performance can be detected effectively and accurately, the research for photovoltaic generating system provides a kind of brand-new means.
One of ordinary skill in the art will appreciate that the hardware that all or part of step realized in above-described embodiment method can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, such as ROM/RAM, magnetic disc, CD etc.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a performance detecting system for photovoltaic generating system, is characterized in that, described system comprises:
Photovoltaic generating system, current transformer, voltage-tracing device, electric power system model and 380V electric power system, wherein,
Described photovoltaic generating system is linked into 380V electric power system via described voltage-tracing device, and the electric energy that described photovoltaic generating system produces is delivered to described 380V electric power system by described voltage-tracing device;
Described current transformer obtains the current signal that described photovoltaic generating system exports, and described current signal is inputed to described electric power system model;
Described electric power system model simulation electric circumstance, and export described voltage-tracing device to after the current signal of reception is changed into voltage signal;
Described voltage-tracing device detects the performance of described photovoltaic generating system according to the voltage signal received;
Described voltage-tracing device comprises:
First AC/DC converter, the second AC/DC converter, DC voltage-stabilizing electric capacity and control section,
Described first AC/DC converter is connected with described photovoltaic generating system, described second AC/DC converter is connected with described 380V electric power system, described first AC/DC converter is connected by described DC voltage-stabilizing electric capacity with the second AC/DC converter, described control section is connected with the first described AC/DC converter, the second AC/DC converter respectively
Described control section receives the voltage signal from described electric power system model, and described voltage signal is converted into start pulse signal, to control conducting and the cut-off of each brachium pontis in described first AC/DC converter and the second AC/DC converter.
2. system according to claim 1, is characterized in that, uses three-phase alternating current cable to be connected between described voltage-tracing device and described 380V electric power system.
3. system according to claim 1, is characterized in that, uses three-phase alternating current cable to be connected between described voltage-tracing device and described photovoltaic generating system.
4. system according to claim 1, is characterized in that, uses coax signal cable to be connected between described voltage-tracing device and described electric power system model.
5. system according to claim 1, is characterized in that, uses coax signal cable to be connected between described current transformer and described electric power system model.
6. system according to claim 1, is characterized in that, described electric power system model is realized by RTDS.
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| CN105007041B (en) * | 2015-07-24 | 2017-08-18 | 南京华盾电力信息安全测评有限公司 | A kind of photovoltaic generation unit performance monitoring method based on eight states |
| CN105785198B (en) * | 2016-04-26 | 2019-05-10 | 中国南方电网有限责任公司电网技术研究中心 | A kind of generating equipment detection system and detection method |
| CN106054093B (en) * | 2016-05-25 | 2019-01-29 | 国网辽宁省电力有限公司电力科学研究院 | A kind of anti-Hz noise capability evaluation device of earthing or grounding means tester |
| CN106251746B (en) * | 2016-08-22 | 2022-04-29 | 杭州澳宇自动化设备有限公司 | Portable photovoltaic power plant analog instrument operation control system |
| CN107065829A (en) * | 2017-04-13 | 2017-08-18 | 西安西热电站信息技术有限公司 | A kind of photovoltaic module pollution diagnosis method supervised based on solar power generation under big data is excavated |
| CN111983993B (en) * | 2020-07-20 | 2021-08-17 | 深圳库博能源科技有限公司 | Automatic testing method for energy storage CMU |
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| JP3363354B2 (en) * | 1997-08-13 | 2003-01-08 | 松下電工株式会社 | Solar power system |
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| CN201805238U (en) * | 2010-08-31 | 2011-04-20 | 山东力诺太阳能电力工程有限公司 | Intelligent control system for photovoltaic grid-connected power plant |
| CN202018484U (en) * | 2011-01-11 | 2011-10-26 | 华北电力科学研究院有限责任公司 | Detecting system for safety equipment of power system |
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