CN107465191A - Photovoltaic plant DC/DC DC/AC Harmonic Control Methods - Google Patents
Photovoltaic plant DC/DC DC/AC Harmonic Control Methods Download PDFInfo
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- CN107465191A CN107465191A CN201710916647.2A CN201710916647A CN107465191A CN 107465191 A CN107465191 A CN 107465191A CN 201710916647 A CN201710916647 A CN 201710916647A CN 107465191 A CN107465191 A CN 107465191A
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- 230000001960 triggered effect Effects 0.000 claims abstract description 13
- 238000010248 power generation Methods 0.000 claims abstract description 4
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- 230000005611 electricity Effects 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H02J3/383—
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
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- Power Engineering (AREA)
- Inverter Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention proposes a kind of photovoltaic plant DC/DC DC/AC Harmonic Control Methods, DC/DC chopper circuits and inverter will be set gradually between photo-voltaic power generation station DC output end and power network, and DC/DC chopper circuits are triggered by SPWM triggers；Obtain photovoltaic plant photovoltaic array output voltage；Obtain each triggering moment and correspond to Trigger Angle, determine photovoltaic plant SPWM triggered time；Determine the output voltage of DC/DC chopper circuit chopper circuits；Calculate the harmonic voltage of inverter output；Photovoltaic plant harmonic content percentage is calculated according to the harmonic voltage that the output voltage of DC/DC chopper circuit chopper circuits and inverter export；Judge current photovoltaic plant harmonic content percentage size, determine that photovoltaic plant DC/DC DC/AC harmonic controling processes meet the requirements.Traditional inverter is improved by the present invention, and the direct current that photovoltaic is sent carries out corresponding copped wave, effectively weakens each harmonic content.
Description
Technical field
The invention belongs to electric power network technique field, and in particular to a kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods.
Background technology
It is higher to the quality requirement of electricity during photovoltaic electric station grid connection, because traditional inverter uses SPWM technologies, by sine
A series of equivalent impulse waveform as constant durations of ripple, by controlling IGBT ON times, the sine wave of needs is formed, but
It is the low-order harmonic that such a method can suppress inverter, possible output and the harmonic component of carrier wave correlated frequency, and due to
The output voltage of photovoltaic array is unstable, and such a harmonic wave can be effectively reduced using DC/DC-DC/AC harmonic suppressing method
Component, and steady dc voltage can be exported so that the quality of electric energy is significantly lifted.
The content of the invention
In view of the shortcomings of the prior art, the present invention proposes a kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods.
A kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods, comprise the following steps：
Step 1：DC/DC chopper circuits and inverter will be set gradually between photo-voltaic power generation station DC output end and power network,
DC/DC chopper circuits are triggered by SPWM triggers；
Step 2：Obtain photovoltaic plant photovoltaic array output voltage Ug, establish DC/DC chopper circuit differences triggering moment electricity
The relational expression of pressure value Trigger Angle corresponding with triggering moment, obtains each triggering moment and corresponds to Trigger Angle, so that it is determined that photovoltaic plant
SPWM triggered time；
The relational expression for establishing DC/DC chopper circuit difference triggering moment magnitudes of voltage Trigger Angle corresponding with triggering moment is such as
Shown in lower：
DC/DC chopper circuits the first triggering moment voltage u1Trigger Angle α corresponding with the first triggering moment1Relational expression it is as follows
It is shown：
Wherein, ut=Ug, α2Trigger Angle, α are corresponded to for the second triggering moment4Trigger Angle is corresponded to for the 4th triggering moment；
The triggering moment voltage u of DC/DC chopper circuits the 3rd3Trigger Angle α corresponding with the 3rd triggering moment3Relational expression it is as follows
It is shown：
The triggering moment voltage u of DC/DC chopper circuits the 5th5Trigger Angle α corresponding with the 5th triggering moment5Relational expression it is as follows
It is shown：
The triggering moment voltage u of DC/DC chopper circuits the 7th7Trigger Angle α corresponding with the 7th triggering moment7Relational expression it is as follows
It is shown：
The triggering moment voltage u of DC/DC chopper circuits the 9th9Trigger Angle α corresponding with the 9th triggering moment9Relational expression it is as follows
It is shown：
Step 3：It is determined that photovoltaic plant SPWM triggered time trigger DC/DC chopper circuits, according to photovoltaic plant light
Photovoltaic array output voltage UgDetermine the output voltage U of DC/DC chopper circuit chopper circuitsd0；
It is described according to photovoltaic plant photovoltaic array output voltage UgDetermine the output voltage of DC/DC chopper circuit chopper circuits
Ud0Calculation formula it is as follows：
Wherein, n=6k ..., ∞, k=1,2 ..., ∞, ω are fundamental frequency.
Step 4：It is more defeated than M and photovoltaic plant photovoltaic array than the amplitude modulation of N, inverter according to the frequency modulation(PFM) of inverter
Go out voltage UgCalculate the harmonic voltage U of inverter outputxh1；
The frequency modulation(PFM) according to inverter exports than the amplitude modulation of N, inverter than M and photovoltaic plant photovoltaic array
Voltage UgCalculate the harmonic voltage U of inverter outputxh1Calculation formula it is as follows：
Wherein, m is overtone order,fcFor carrier frequency, fmFor frequency of modulated wave, MmFor carrier wave
Amplitude, McTo modulate wave amplitude,For second harmonic initial phase, n=6k ..., ∞, k=1,2 ..., ∞, ω are fundamental wave frequency
Rate.
Step 5：According to the output voltage U of DC/DC chopper circuit chopper circuitsd0With the harmonic voltage U of inverter outputxh1
Calculate photovoltaic plant harmonic content percentage υ；
The calculation formula of the photovoltaic plant harmonic content percentage υ is as follows：
Step 6：Judge whether current photovoltaic plant harmonic content percentage υ is less than or equal to the threshold of harmonic content percentage
Value, if so, then current photovoltaic plant DC/DC-DC/AC harmonic controling processes meet the requirements, otherwise, adjust DC/DC chopper circuits
Each triggering moment corresponds to Trigger Angle, so that it is determined that photovoltaic plant SPWM triggered time, return to step 3.
The threshold value of the harmonic content percentage is 10%.
Beneficial effects of the present invention：
The present invention proposes a kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods, of the invention by traditional inverter
It is improved, DC/DC converters is added before inverter, the direct current that photovoltaic is sent carries out corresponding copped wave, becomes another
The direct current of kind fixed voltage, the direct current of this fixed voltage is subjected to corresponding SPWM conversion, can effectively be weakened each time
Harmonic content.
Brief description of the drawings
Fig. 1 is the FB(flow block) of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods in present embodiment；
Fig. 2 is the apparatus structure block diagram of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods in embodiment of the present invention.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
In present embodiment, for certain photovoltaic plant using 36V cell panel, its connection in series-parallel number is 10 and 100；Therefore finally
Go out photovoltaic plant photovoltaic array output voltage UgFor 360V, the amplitude modulation of inverter is 0.8 than M, the frequency modulation(PFM) of inverter
It is 40 than N, output fundamental frequency ω is 50Hz.
A kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods, as shown in figure 1, comprising the following steps：
Step 1：DC/DC chopper circuits and inverter will be set gradually between photo-voltaic power generation station DC output end and power network,
DC/DC chopper circuits are triggered by SPWM triggers, as shown in Figure 2.
Step 2：Obtain photovoltaic plant photovoltaic array output voltage Ug, establish DC/DC chopper circuit differences triggering moment electricity
The relational expression of pressure value Trigger Angle corresponding with triggering moment, obtains each triggering moment and corresponds to Trigger Angle, so that it is determined that photovoltaic plant
SPWM triggered time.
In present embodiment, DC/DC chopper circuit difference triggering moment magnitudes of voltage Trigger Angle corresponding with triggering moment is established
Relational expression it is as follows：
DC/DC chopper circuits the first triggering moment voltage u1Trigger Angle α corresponding with the first triggering moment1Relational expression such as formula
(1) shown in：
Wherein, ut=Ug, α2Trigger Angle, α are corresponded to for the second triggering moment4Trigger Angle is corresponded to for the 4th triggering moment.
The triggering moment voltage u of DC/DC chopper circuits the 3rd3Trigger Angle α corresponding with the 3rd triggering moment3Relational expression such as formula
(2) shown in：
The triggering moment voltage u of DC/DC chopper circuits the 5th5Trigger Angle α corresponding with the 5th triggering moment5Relational expression such as formula
(3) shown in：
The triggering moment voltage u of DC/DC chopper circuits the 7th7Trigger Angle α corresponding with the 7th triggering moment7Relational expression such as formula
(4) shown in：
The triggering moment voltage u of DC/DC chopper circuits the 9th9Trigger Angle α corresponding with the 9th triggering moment9Relational expression such as formula
(5) shown in：
Make DC/DC chopper circuits the first triggering moment voltage u1Equal to photovoltaic plant photovoltaic array output voltage Ug, make DC/
The triggering moment voltage u of DC chopper circuits the 3rd3, the 5th triggering moment voltage u5, the 7th triggering moment voltage u7, the 9th triggering when
Carve voltage u9Equal to 0, formula is obtained such as shown in (6)-(10)：
It can be obtained by above-mentioned formula (6)-(7),
Step 3：It is determined that photovoltaic plant SPWM triggered time trigger DC/DC chopper circuits, according to photovoltaic plant light
Photovoltaic array output voltage UgDetermine the output voltage U of DC/DC chopper circuit chopper circuitsd0。
In present embodiment, according to photovoltaic plant photovoltaic array output voltage UgDetermine DC/DC chopper circuit chopper circuits
Output voltage Ud0Calculation formula such as formula (11) shown in：
Wherein, n=6k ..., ∞, k=1,2 ..., ∞, ω are fundamental frequency.
Step 4：It is more defeated than M and photovoltaic plant photovoltaic array than the amplitude modulation of N, inverter according to the frequency modulation(PFM) of inverter
Go out voltage UgCalculate the harmonic voltage U of inverter outputxh1。
In present embodiment, according to the frequency modulation(PFM) of inverter than N, inverter amplitude modulation than M and photovoltaic plant light
Photovoltaic array output voltage UgCalculate the harmonic voltage U of inverter outputxh1Calculation formula such as formula (12) shown in：
Wherein, m is overtone order,fcFor carrier frequency, fmFor frequency of modulated wave, MmFor carrier wave
Amplitude, McTo modulate wave amplitude,For second harmonic initial phase, n=6k ..., ∞, k=1,2 ..., ∞, ω are fundamental wave frequency
Rate.
Step 5：According to the output voltage U of DC/DC chopper circuit chopper circuitsd0With the harmonic voltage U of inverter outputxh1
Calculate photovoltaic plant harmonic content percentage υ.
In present embodiment, shown in photovoltaic plant harmonic content percentage υ calculation formula such as formula (14)：
Step 6：Judge whether current photovoltaic plant harmonic content percentage υ is less than or equal to the threshold of harmonic content percentage
Value, if so, then current photovoltaic plant DC/DC-DC/AC harmonic controling processes meet the requirements, otherwise, adjust DC/DC chopper circuits
Each triggering moment corresponds to Trigger Angle, so that it is determined that photovoltaic plant SPWM triggered time, return to step 23.
In present embodiment, the threshold value of harmonic content percentage is 10%, because of the ＜ 10% of υ=8.17%, current photovoltaic electric
DC/DC-DC/AC harmonic controling processes of standing meet the requirements.Otherwise, the triggering moment voltage u of DC/DC chopper circuits the 3rd is adjusted3,
Five triggering moment voltage u5, the 7th triggering moment voltage u7, the 9th triggering moment voltage u9Value, so as to adjust DC/DC copped waves electricity
Each triggering moment in road corresponds to Trigger Angle, so that it is determined that photovoltaic plant SPWM triggered time, return to step 3.
Claims (5)
1. a kind of photovoltaic plant DC/DC-DC/AC Harmonic Control Methods, it is characterised in that comprise the following steps：
Step 1：DC/DC chopper circuits and inverter will be set gradually between photo-voltaic power generation station DC output end and power network, passed through
SPWM triggers trigger DC/DC chopper circuits；
Step 2：Obtain photovoltaic plant photovoltaic array output voltage Ug, establish DC/DC chopper circuits difference triggering moment magnitude of voltage with
Triggering moment corresponds to the relational expression of Trigger Angle, obtains each triggering moment and corresponds to Trigger Angle, so that it is determined that photovoltaic plant SPWM's touches
Send out the time；
Step 3：It is determined that photovoltaic plant SPWM triggered time trigger DC/DC chopper circuits, according to photovoltaic plant photovoltaic battle array
Row output voltage UgDetermine the output voltage U of DC/DC chopper circuit chopper circuitsd0；
Step 4：It is more electric than M and the output of photovoltaic plant photovoltaic array than the amplitude modulation of N, inverter according to the frequency modulation(PFM) of inverter
Press UgCalculate the harmonic voltage U of inverter outputxh1；
Step 5：According to the output voltage U of DC/DC chopper circuit chopper circuitsd0With the harmonic voltage U of inverter outputxh1Calculate
Photovoltaic plant harmonic content percentage υ；
The calculation formula of the photovoltaic plant harmonic content percentage υ is as follows：
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Moment corresponds to Trigger Angle, so that it is determined that photovoltaic plant SPWM triggered time, return to step 3.
2. photovoltaic plant DC/DC-DC/AC Harmonic Control Methods according to claim 1, it is characterised in that the foundation
The relational expression of DC/DC chopper circuit difference triggering moment magnitudes of voltage Trigger Angle corresponding with triggering moment is as follows：
DC/DC chopper circuits the first triggering moment voltage u1Trigger Angle α corresponding with the first triggering moment1Relational expression it is as follows：
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<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
<mo>;</mo>
</mrow>
The triggering moment voltage u of DC/DC chopper circuits the 7th7Trigger Angle α corresponding with the 7th triggering moment7Relational expression it is as follows：
<mrow>
<msub>
<mi>u</mi>
<mn>7</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<msub>
<mi>u</mi>
<mi>t</mi>
</msub>
</mrow>
<mrow>
<mn>7</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mo>&lsqb;</mo>
<mn>1</mn>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>7</mn>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>7</mn>
<msub>
<mi>&alpha;</mi>
<mn>2</mn>
</msub>
<mo>+</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>7</mn>
<msub>
<mi>&alpha;</mi>
<mn>3</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>7</mn>
<msub>
<mi>&alpha;</mi>
<mn>4</mn>
</msub>
<mo>+</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>7</mn>
<msub>
<mi>&alpha;</mi>
<mn>5</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
<mo>;</mo>
</mrow>
The triggering moment voltage u of DC/DC chopper circuits the 9th9Trigger Angle α corresponding with the 9th triggering moment9Relational expression it is as follows：
<mrow>
<msub>
<mi>u</mi>
<mn>9</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<msub>
<mi>u</mi>
<mi>t</mi>
</msub>
</mrow>
<mrow>
<mn>9</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mo>&lsqb;</mo>
<mn>1</mn>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>9</mn>
<msub>
<mi>&alpha;</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>9</mn>
<msub>
<mi>&alpha;</mi>
<mn>2</mn>
</msub>
<mo>+</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>9</mn>
<msub>
<mi>&alpha;</mi>
<mn>3</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>9</mn>
<msub>
<mi>&alpha;</mi>
<mn>4</mn>
</msub>
<mo>+</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mn>2</mn>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mrow>
<mo>(</mo>
<mn>9</mn>
<msub>
<mi>&alpha;</mi>
<mn>5</mn>
</msub>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mrow>
<mn>2</mn>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
<mo>.</mo>
</mrow>
1
3. photovoltaic plant DC/DC-DC/AC Harmonic Control Methods according to claim 1, it is characterised in that the basis
Photovoltaic plant photovoltaic array output voltage UgDetermine the output voltage U of DC/DC chopper circuit chopper circuitsd0Calculation formula it is as follows
It is shown：
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>d</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
<msubsup>
<mo>&Integral;</mo>
<mrow>
<mo>-</mo>
<mfrac>
<mi>&pi;</mi>
<mn>6</mn>
</mfrac>
</mrow>
<mfrac>
<mi>&pi;</mi>
<mn>6</mn>
</mfrac>
</msubsup>
<mi>cos</mi>
<mi>&omega;</mi>
<mi>t</mi>
<mi>d</mi>
<mi>&omega;</mi>
<mi>t</mi>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>6</mn>
<mi>k</mi>
</mrow>
<mi>&infin;</mi>
</munderover>
<mo>-</mo>
<mfrac>
<mrow>
<mn>6</mn>
<msqrt>
<mn>2</mn>
</msqrt>
<msub>
<mi>U</mi>
<mi>g</mi>
</msub>
<mi>cos</mi>
<mi>k</mi>
<mi>&omega;</mi>
<mi>t</mi>
<mi>&pi;</mi>
</mrow>
<mrow>
<mo>(</mo>
<msup>
<mi>n</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
<mi>&pi;</mi>
</mrow>
</mfrac>
<mi>cos</mi>
<mi>n</mi>
<mi>&omega;</mi>
<mi>t</mi>
<mo>;</mo>
</mrow>
Wherein, n=6k ... ∞, k=1,2 ... ∞, ω are fundamental frequency.
4. photovoltaic plant DC/DC-DC/AC Harmonic Control Methods according to claim 1, it is characterised in that the basis
The frequency modulation(PFM) of inverter than N, inverter amplitude modulation than M and photovoltaic plant photovoltaic array output voltage UgCalculate inverter
The harmonic voltage U of outputxh1Calculation formula it is as follows：
Wherein, m is overtone order,fcFor carrier frequency, fmFor frequency of modulated wave, MmFor carrier wave width
Value, McTo modulate wave amplitude,For second harmonic initial phase, n=6k ... ∞, k=1,2 ... ∞, ω are fundamental frequency.
5. photovoltaic plant DC/DC-DC/AC Harmonic Control Methods according to claim 1, it is characterised in that the harmonic wave
The threshold value of percentage composition is 10%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108711858A (en) * | 2018-07-19 | 2018-10-26 | 沈阳工业大学 | Based on the inverter harmonic restraining device and method for following photovoltaic plant to go out fluctuation |
| CN109167395A (en) * | 2018-11-22 | 2019-01-08 | 国网宁夏电力有限公司电力科学研究院 | The transient state equivalence potential discrimination method of photovoltaic generating system based on ADPSS |
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| CN108711858A (en) * | 2018-07-19 | 2018-10-26 | 沈阳工业大学 | Based on the inverter harmonic restraining device and method for following photovoltaic plant to go out fluctuation |
| CN108711858B (en) * | 2018-07-19 | 2023-08-08 | 沈阳工业大学 | Inverter harmonic suppression method based on following photovoltaic power station output fluctuation |
| CN109167395A (en) * | 2018-11-22 | 2019-01-08 | 国网宁夏电力有限公司电力科学研究院 | The transient state equivalence potential discrimination method of photovoltaic generating system based on ADPSS |
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