CN109546682A - A kind of photo-voltaic power supply short circuit calculation method - Google Patents
A kind of photo-voltaic power supply short circuit calculation method Download PDFInfo
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Abstract
The present invention relates to photovoltaic circuit technical fields, more specifically, it is related to a kind of photo-voltaic power supply short circuit calculation method, grid entry point three-phase voltage data after output electric current, grid entry point voltage and failure before obtaining photo-voltaic power supply failure, voltage and current-power equation is established according to the data of acquisition, solves the active power of output of photo-voltaic power supply before failure；And grid entry point three-phase voltage-positive sequence voltage equation is obtained using symmetrical component method；Under two-phase rotating coordinate system, contravarianter voltage outer loop control equation is established；According to rotation two-phase/three-phase coordinate system transformation equation, photo-voltaic power supply three-phase fault electric current is solved.The present invention more fits in engineering reality, and the accuracy of short circuit calculation is higher, can preferably calculate for the grid short circuit containing photo-voltaic power supply and relay protection research provides support.
Description
Technical field
The present invention relates to photovoltaic circuit technical fields, more particularly, to a kind of photo-voltaic power supply short circuit calculation method.
Background technique
In recent years, solar power generation installed capacity quickly increases, and technological progress and industrial upgrading are accelerated, it has also become global energy
The key areas of source transition.The extensive off-grid of photo-voltaic power supply gives power network safety operation bring when electric network fault in order to prevent
Harm, in the related regulation that photo-voltaic power supply is incorporated into the power networks, low voltage crossing energy need to be had by being distinctly claimed large and medium-sized photovoltaic plant
Power.Particularity of the photo-voltaic power supply due to its own generation mode, circuit topological structure and low-voltage crossing control strategy, failure spy
Property is not far in conventional synchronization motor.After a large amount of photo-voltaic power supplies implement low-voltage crossing operation, the complicated short circuit current fed out will
Many adverse effects are brought to the relay protection of power grid, may cause false protection or tripping, and then threaten the peace of electric system
Full stable operation.
Therefore, the short circuit current specificity analysis for carrying out photo-voltaic power supply in a deep going way, the economics analysis for establishing short circuit current calculate mould
Type, to its influence to electric grid relay protection of accurate evaluation, improve and perfect protective value has important practical significance.It is right
This, relevant short circuit calculation method has: the stable fault currents characteristic and calculation method (Zhou Niancheng, Ye Ling, Wang Qiang of photo-voltaic power supply
Steel waits to calculate [J] Proceedings of the CSEE containing the inverse distributed power power grid unsymmetrical short-circuit that negative-sequence current injects,
2013,33 (36): 41-49.), but it does not consider the transient fault characteristic of photo-voltaic power supply, therefore conclusion is only applicable to stable state
Short-circuit analysis；Based on the constant short circuit calculation method of DC bus-bar voltage, (Kong Xiangping, Zhang Zhe, Yin Xianggen wait containing inverse type point
The electric network fault current characteristics and failure analysis methods of cloth power supply study [J] Proceedings of the CSEE, 2013,33 (34):
65-74.), but photo-voltaic power supply is under fault condition, and the electromagnetic power of output will significantly change, and will lead to DC bus
Voltage fluctuation, and then will affect output fault current, therefore above-mentioned Near covering and not perfect；Based on the short of Digital Simulation
(Bi Tianshu, Liu Sumei, Xue Ancheng wait inverse type new energy power failure transient characterisitics analysis [J] China electricity to the research of road electric current
Machine engineering journal, 2013,33 (13): 165-171.), but it is mainly limited to qualitative analysis, lacks necessary theory analysis branch
It holds.In summary, it can reflect the short circuit calculation method of photo-voltaic power supply failure overall process and not perfect at present, especially consider failure
In terms of the short circuit calculation of period DC bus-bar voltage fluctuation, effective calculation method is not yet proposed.For this problem, the present invention mentions
Have it is a kind of take into account the photo-voltaic power supply short circuit calculation method that DC bus-bar voltage fluctuates during failure, for the power grid containing photo-voltaic power supply
Short circuit calculation and relay protection research provide reference.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides a kind of photo-voltaic power supply short circuit calculation side
Method, the present invention more fit in engineering reality, and the accuracy of short circuit calculation is higher, can preferably be the grid short circuit containing photo-voltaic power supply
It calculates and relay protection research provides support.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of photo-voltaic power supply short circuit calculation method,
In, include following steps:
S1: grid entry point three-phase voltage data after the output electric current, grid entry point voltage and failure before obtaining photo-voltaic power supply failure,
Voltage and current-power equation is established according to the data of acquisition, solves the active power of output of photo-voltaic power supply before failure；
S2: according to symmetrical component method, obtaining grid entry point three-phase voltage-positive sequence voltage equation, and grid entry point is being just after solving failure
Sequence voltage, and the power voltage equation of DC bus is established, solve DC bus-bar voltage；
S3: under two-phase rotating coordinate system, contravarianter voltage outer loop control equation is established, solves output watt current；?
Under two-phase rotating coordinate system, according to low-voltage crossing service requirement, low-voltage crossing operation governing equation is established, solves and exports idle electricity
Stream；
S4: establishing photo-voltaic power supply inverter current limliting equation, solves output watt current limit value；
S5: the output watt current limit value in comparison step S3 and step S4 chooses smaller output watt current limit value；
S6: according to rotation two-phase/three-phase coordinate system transformation equation, photo-voltaic power supply three-phase fault electric current is solved.
In one embodiment, in step S1, voltage and current-power equation are as follows:
In formula: P0To issue active power before photo-voltaic power supply failure；For grid entry point phase voltage virtual value before failure；
For output current phase virtual value before failure；θ is power factor angle, and power factor angle θ is 90 °.
In one embodiment, in step S2, grid entry point three-phase voltage-positive sequence voltage equation is；
In formula: Ug1For grid entry point positive sequence voltage amplitude；WithRespectively grid entry point three-phase voltage；Operator α
=ej120°, α2=ej240°。
In one embodiment, in step S2, the power voltage equation of DC bus are as follows:
In formula:For dc-link capacitance voltage rating, typical value 2500V；udcFor dc-link capacitance voltage；Pg
For photo-voltaic power supply active power of output；PcrowPower is consumed for direct-current unloading circuit.
In one embodiment, in step S3, contravarianter voltage outer loop control equation are as follows:
In formula: kP、kIFor P, I parameter of outer voltage PI controller；Photo-voltaic power supply exports d shaft current instruction value.
In one embodiment, in step S3, low-voltage crossing runs governing equation are as follows:
In formula: in formula:Q shaft current instruction value is exported for photo-voltaic power supply；For inverter output current amplitude limit value, allusion quotation
Type value is 1.2pu.
In one embodiment, in step S4, inverter current limliting equation are as follows:
In formula:D shaft current instruction value is exported for photo-voltaic power supply,Q shaft current instruction value is exported for photo-voltaic power supply,
For inverter output current amplitude limit value.
In one embodiment, in step S6, two-phase/three-phase coordinate system transformation equation are as follows:
In formula: iga、iga、igaThree-phase current is exported for photo-voltaic power supply；α=ω1T+ θ, wherein ω1For synchronous angular velocity, θ is
A phase current initial phase；ig0To export zero-sequence current.
Compared with prior art, the present invention having the following characteristics that
Technical solution of the present invention is different from the prior art and assumes that DC bus-bar voltage is constant during failure, but by straight
The power voltage equation of stream bus acquires DC bus-bar voltage, then acquires output current command value based on contravarianter voltage outer ring,
Actual output current is finally acquired based on inverter current inner ring.Technical solution of the present invention more fits in engineering reality, short circuit
The accuracy of calculating is higher, can preferably calculate for the grid short circuit containing photo-voltaic power supply and relay protection research provides reference.
Detailed description of the invention
Fig. 1 is method flow schematic diagram in the embodiment of the present invention.
Specific embodiment
Attached drawing only for illustration, is not considered as limiting the invention；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of positional relationship is described in attached drawing
Illustrate, is not considered as limiting the invention.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified
Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment 1:
As shown in Figure 1, the present invention provides a kind of photo-voltaic power supply short circuit calculation method, include following steps:
S1: grid entry point three-phase voltage data after the output electric current, grid entry point voltage and failure before obtaining photo-voltaic power supply failure,
Voltage and current-power equation is established according to the data of acquisition, solves the active power of output of photo-voltaic power supply before failure；
Voltage and current-power equation are as follows:
In formula: P0To issue active power before photo-voltaic power supply failure；For grid entry point phase voltage virtual value before failure；
For output current phase virtual value before failure；θ is power factor angle.
S2: according to symmetrical component method, obtaining grid entry point three-phase voltage-positive sequence voltage equation, and grid entry point is being just after solving failure
Sequence voltage, and the power voltage equation of DC bus is established, solve DC bus-bar voltage；
Grid entry point three-phase voltage-positive sequence voltage equation is；
In formula: Ug1For grid entry point positive sequence voltage amplitude；WithRespectively grid entry point three-phase voltage；Operator α
=ej120°, α2=ej240°。
The power voltage equation of DC bus are as follows:
In formula:For dc-link capacitance voltage rating, typical value 2500V；udcFor dc-link capacitance voltage；Pg
For photo-voltaic power supply active power of output；PcrowPower is consumed for direct-current unloading circuit.
S3: under two-phase rotating coordinate system, contravarianter voltage outer loop control equation is established, solves output watt current；?
Under two-phase rotating coordinate system, according to low-voltage crossing service requirement, low-voltage crossing operation governing equation is established, solves and exports idle electricity
Stream；
Contravarianter voltage outer loop control equation are as follows:
In formula: kP、kIFor P, I parameter of outer voltage PI controller；Photo-voltaic power supply exports d shaft current instruction value.
Low-voltage crossing runs governing equation are as follows:
In formula: in formula:Q shaft current instruction value is exported for photo-voltaic power supply；For inverter output current amplitude limit value, take
Value is 1.2pu.
S4: establishing photo-voltaic power supply inverter current limliting equation, solves output watt current limit value；
Inverter current limliting equation are as follows:
In formula:D shaft current instruction value is exported for photo-voltaic power supply,Q shaft current instruction value is exported for photo-voltaic power supply,
For inverter output current amplitude limit value.
S5: the output watt current limit value in comparison step S3 and step S4 chooses smaller output watt current limit value；
S6: according to rotation two-phase/three-phase coordinate system transformation equation, photo-voltaic power supply three-phase fault electric current is solved.
Two-phase/three-phase coordinate system transformation equation are as follows:
In formula: iga、iga、igaThree-phase current is exported for photo-voltaic power supply；α=ω1T+ θ, wherein ω1For synchronous angular velocity, θ is
A phase current initial phase；ig0To export zero-sequence current, general value is 0, because the case of photo-voltaic power supply becomes and boosting change makes itself and electricity
Net zero-sequence network disconnects, non-zero-sequence current access.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of photo-voltaic power supply short circuit calculation method, which is characterized in that include following steps:
S1: grid entry point three-phase voltage data after the output electric current, grid entry point voltage and failure before obtaining photo-voltaic power supply failure, according to
The data of acquisition establish voltage and current-power equation, solve the active power of output of photo-voltaic power supply before failure；
S2: according to symmetrical component method, obtaining grid entry point three-phase voltage-positive sequence voltage equation, solves grid entry point positive sequence electricity after failure
Pressure, and the power voltage equation of DC bus is established, solve DC bus-bar voltage；
S3: under two-phase rotating coordinate system, contravarianter voltage outer loop control equation is established, solves output watt current；In two-phase
Under rotating coordinate system, according to low-voltage crossing service requirement, low-voltage crossing operation governing equation is established, output reactive current is solved；
S4: establishing photo-voltaic power supply inverter current limliting equation, solves output watt current limit value；
S5: the output watt current limit value in comparison step S3 and step S4 chooses smaller output watt current limit value；
S6: according to rotation two-phase/three-phase coordinate system transformation equation, photo-voltaic power supply three-phase fault electric current is solved.
2. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S1, voltage electricity
Stream-power equation are as follows:
In formula: P0To issue active power before photo-voltaic power supply failure；For grid entry point phase voltage virtual value before failure；For event
Output current phase virtual value before hindering；θ is power factor angle.
3. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S2, grid entry point
Three-phase voltage-positive sequence voltage equation is；
In formula: Ug1For grid entry point positive sequence voltage amplitude；WithRespectively grid entry point three-phase voltage；Operator α=
ej120°, α2=ej240°。
4. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S2, direct current is female
The power voltage equation of line are as follows:
In formula:For dc-link capacitance voltage rating, typical value 2500V；udcFor dc-link capacitance voltage；PgFor light
Lie prostrate power supply active power of output；PcrowPower is consumed for direct-current unloading circuit.
5. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S3, inverter
Outer voltage governing equation are as follows:
In formula: kP、kIFor P, I parameter of outer voltage PI controller；Photo-voltaic power supply exports d shaft current instruction value.
6. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S3, low pressure is worn
More run governing equation are as follows:
In formula: in formula:Q shaft current instruction value is exported for photo-voltaic power supply；For inverter output current amplitude limit value.
7. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S4, inverter
Current limliting equation are as follows:
In formula:D shaft current instruction value is exported for photo-voltaic power supply,Q shaft current instruction value is exported for photo-voltaic power supply,It is inverse
Become device output current limiting value.
8. photo-voltaic power supply short circuit calculation method according to claim 1, which is characterized in that in the step S6, two-phase/tri-
Phase coordinate system transformation equation are as follows:
In formula: iga、iga、igaThree-phase current is exported for photo-voltaic power supply；α=ω1T+ θ, wherein ω1For synchronous angular velocity, θ is A phase
Electric current initial phase；ig0To export zero-sequence current.
9. photo-voltaic power supply short circuit calculation method according to claim 2, which is characterized in that power factor angle θ is 90 °.
10. photo-voltaic power supply short circuit calculation method according to claim 6, which is characterized in that describedValue is 1.2pu.
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Cited By (4)
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| CN110378597A (en) * | 2019-07-19 | 2019-10-25 | 广东电网有限责任公司 | A kind of photovoltaic power generation equipment fault current on-line calculation method and device |
| CN111525567A (en) * | 2020-06-04 | 2020-08-11 | 南方电网科学研究院有限责任公司 | Method and device for calculating fault current of photovoltaic grid-connected inverter |
| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
| CN113346466A (en) * | 2021-06-22 | 2021-09-03 | 国网重庆市电力公司 | Inverter type power station single-phase earth fault protection method considering earth capacitance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110378597A (en) * | 2019-07-19 | 2019-10-25 | 广东电网有限责任公司 | A kind of photovoltaic power generation equipment fault current on-line calculation method and device |
| CN110378597B (en) * | 2019-07-19 | 2022-02-15 | 广东电网有限责任公司 | Photovoltaic power generation equipment fault current online calculation method and device |
| CN111525567A (en) * | 2020-06-04 | 2020-08-11 | 南方电网科学研究院有限责任公司 | Method and device for calculating fault current of photovoltaic grid-connected inverter |
| CN111525567B (en) * | 2020-06-04 | 2022-02-15 | 南方电网科学研究院有限责任公司 | Method and device for calculating fault current of photovoltaic grid-connected inverter |
| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
| CN112255567B (en) * | 2020-10-16 | 2023-05-09 | 西安石油大学 | Short-circuit current rapid determination method for power distribution network containing photovoltaic power supply |
| CN113346466A (en) * | 2021-06-22 | 2021-09-03 | 国网重庆市电力公司 | Inverter type power station single-phase earth fault protection method considering earth capacitance |
| CN113346466B (en) * | 2021-06-22 | 2022-11-15 | 国网重庆市电力公司 | Inverter type power station single-phase earth fault protection method considering earth capacitance |
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