CN106849111A - A kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation - Google Patents
A kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation Download PDFInfo
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- CN106849111A CN106849111A CN201611052089.1A CN201611052089A CN106849111A CN 106849111 A CN106849111 A CN 106849111A CN 201611052089 A CN201611052089 A CN 201611052089A CN 106849111 A CN106849111 A CN 106849111A
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- 238000011217 control strategy Methods 0.000 claims abstract description 27
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H02J3/383—
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
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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
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Abstract
The invention discloses a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation, voltage-regulation is carried out to statements based on collusion circuit using photovoltaic DC-to-AC converter generator operation as synchronous condenser ability, to the Q (U) that commonly uses andControl strategy is improved, both can at any time for power network provides reactive power support, or photovoltaic plant reduces dynamic passive compensation equipment investment, and line voltage regulation is both participated in by transferring all photovoltaic DC-to-AC converters, so that reactive absorption total amount is minimum, electric network active, reactive loss are minimum.
Description
Technical field
The invention belongs to photovoltaic DC-to-AC converter field, more particularly to a kind of statements based on collusion circuit pressure regulation based on photovoltaic DC-to-AC converter phase modulation
Method.
Background technology
Solar energy is inexhaustible as renewable green energy resource, pollution-free, low cost, is acknowledged as 21
Century one of most important new energy.Competitively employ huge R＆D team and a huge sum of money to study solar energy hair in countries in the world
Power technology.Wherein, photovoltaic generation because its battery material silicon abundance, it is with low cost the advantages of and favored.It
General principle is, by the photovoltaic effect of solar cell surface, to realize by the conversion of luminous energy to electric energy.Photovoltaic generation pair
Optimization of Energy Structure, promote energy-saving and emission-reduction, realize that sustainable economic development are significant, photovoltaic power generation grid-connecting operation into
It is the Main way of Future Development.
Western China illumination is sufficient, and precipitation is few, has substantial amounts of photovoltaic plant.Load in local power network compared with
Gently, it is distant between load point and load point, after being powered using long range statements based on collusion mode, due to the R/X values of high voltage transmission line
Smaller, there is more serious reactive voltage in power transmission line terminal voltage apparently higher than head end voltage.At present, it is domestic grid-connected
Photovoltaic plant is required to configure capacitive and 5% or so the inductive reactive power compensation device for accounting for installed capacity 20% or so, also usually
It is required that being the SVG of dynamic compensation, involve great expense.
With the development of Power Electronic Technique and industrial control technology, the modulation system and control strategy of inverter there has also been
Very big lifting.Especially inverter possesses generator operation as synchronous condenser ability to new energy plant stand in photovoltaic plant.Effective exploitation and utilization are inverse
Become device generator operation as synchronous condenser ability, both at any time for power network provides reactive power support, or the new energy plant stand of inverter can be used to reduce
Dynamic passive compensation equipment investment.Conventional pressure regulation method have using Q (U) andControl strategy carries out pressure regulation, Q (U) controls
The lower inverter of system strategy absorbs or send reactive power does not have direct relation with photovoltaic active power output size and payload, its
The idle total amount that control strategy absorbs is minimum, reduces grid loss, but both participates in power network without all photovoltaic DC-to-AC converters are transferred
Voltage-regulation, whole photovoltaic system pressure regulation ability is weaker.Control strategy set up this assumes that grid entry point voltage with
Photovoltaic active power output increases and raises.When photovoltaic active power output is very big, and precisely user power utilization peak when, now grid entry point electricity
Pressure is not out-of-limit, and substantial amounts of idle output can increase electric network active, reactive loss.
The content of the invention
Technical problem：The present invention provides a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation, using photovoltaic
Inverter generator operation as synchronous condenser ability carries out voltage-regulation to statements based on collusion circuit, and each node voltage is maintained in the reasonable scope in making power network.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
Step 1：Generator in power network, transformer, circuit, load are carried out into equivalent treatment, network equivalence model is set up.
Step 2：Load flow calculation is carried out to network equivalence model, Power Flow Information is obtained, including each node voltage, each branch road have
Work(reactive power.
Step 3：Judge photovoltaic system grid entry point voltage UiScope, if 0.95p.u.≤Ui≤ 1.05p.u., then directly tie
Beam, otherwise carries out step 4.
Step 4：The idle output valve Q of photovoltaic system is calculated according to Q (U) control strategy based on grid entry point voltage magnitudeui, Q
(U) control strategy directly gathers voltage U at photovoltaic system grid entry pointi, its expression formula is
In formula：U1、U2、U3、U4The magnitude of voltage of expression is respectively 0.95,0.98,1.02,1.05p.u.；QimaxIt is photovoltaic system
The maximum of idle output during active rated output of uniting.
According to based on active outputControl strategy calculates the idle output valve Q of photovoltaic systempi,Control
Strategy is according to photovoltaic system active power output P setting power factor values by C1It is changed into C2, its expression formula is
In formula：C1=1, C2=0.9, PimIt is active nominal output values, P1=Pim/ 2, P2=Pim。
Step 5：Q (U) control strategy based on grid entry point voltage magnitude is set and calculates the idle output valve Q of photovoltaic systemuiPower
Weight coefficient initial value a=1, is set based on active outputControl strategy calculates the idle output valve Q of photovoltaic systempiPower
Weight coefficient initial value b=0.
Step 6：Judge QpiWeight coefficient b, directly terminates if b >=1, otherwise carries out step 7.
Step 7：Calculate the idle output valve Q of photovoltaic systemi, its expression formula is
Qi=aQui+bQpi (4)
In formula：QuiIt is the idle output valve of photovoltaic system that Q (U) control strategy based on grid entry point voltage magnitude is calculated, a
It is its weight coefficient, QpiIt is based on active outputThe idle output valve of photovoltaic system that control strategy is calculated, b is
Its weight coefficient.
Step 8：Judge the idle output valve Q of photovoltaic systemiSize, if Qi=Qim, then directly terminate, step 9 is otherwise carried out,
QimIt is the idle output capacity of photovoltaic system.
Step 9：Judge photovoltaic system grid entry point voltage UiScope, if 0.95p.u.≤Ui≤ 1.05p.u., then directly tie
Beam, otherwise carries out step 10.
Step 10：Make weight coefficient a=a-0.05, b=b+0.05, return to step 6.
Beneficial effect：Compared with prior art, technical scheme has advantages below：
1. the invention provides a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation, the method effective exploitation
And inverter generator operation as synchronous condenser ability is utilized, both can at any time for power network provides reactive power support, or photovoltaic plant reduces dynamic nothing
Work(compensates equipment investment, and each node voltage is maintained in the reasonable scope in making power network；
2. the present invention inherit Q (U) andThe advantage of control strategy, while overcoming respective deficiency again, passes through
Transfer all photovoltaic DC-to-AC converters and both participate in line voltage regulation so that reactive absorption total amount is minimum, and electric network active, reactive loss are most
It is small.
Brief description of the drawings
Fig. 1 is flow chart of the invention；
Fig. 2 is Xinjiang boundary south area power grid topological diagram；
Fig. 3 is the Xinjiang boundary south area power grid model built in DIgSILENT softwares.
Specific embodiment
With reference to embodiment, to a kind of statements based on collusion circuit pressure regulation side based on photovoltaic DC-to-AC converter phase modulation proposed by the invention
Method elaborates.It is emphasized that what the description below was merely exemplary, rather than in order to limit the scope of the present embodiment
And its application.
Embodiment is Xinjiang boundary south area power grid, and power grid topological graph is as shown in Figure 2.Wherein Aksu --- Bachu, bar
Chu --- Keshen circuit is long range 750kV trolley lines, and remaining is 220kV trolley lines, constitutes typical case's statements based on collusion line construction
Power network, wherein Aksu, Bachu, the 750/220/63kV three-winding transformers of Keshen node installing 1500MVA capacity, Jin Lu,
Markit County, Shache county, Yingjisha, Austria are connected to Large Copacity photovoltaic system according to Plutarch node.According to actual electric network data in DIgSILENT
In build electric network model, as shown in Figure 3.If Aksu node is balance nodes, by the statements based on collusion line based on photovoltaic DC-to-AC converter phase modulation
Control module in road pressure regulation method write-in DIgSILENT, is adjusted to whetheing there is using the statements based on collusion circuit based on photovoltaic DC-to-AC converter phase modulation
The node voltage that pressure method is obtained is analyzed.
By Bachu --- as a example by the 750kV trolley lines of Keshen, line length 188km, unit length positive-negative sequence resistance value is
0.0138 Ω/km, unit length positive-negative sequence reactance value is 0.2833 Ω/km, and R/X value very littles, when power flows through circuit, can go out
, higher than the situation of head end, when only reactive-load compensation equipment is added in Bachu node, Keshen node voltage is bright for existing line end voltage
It is aobvious exceeded, 1.055p.u. is reached, each node voltage is as shown in table 1.
Boundary south each node voltage of area power grid before the pressure regulation of table 1
| Node name | Voltage (p.u.) | Node name | Voltage (p.u.) | Node name | Voltage (p.u.) |
| Aksu | 1.000 | Bachu | 1.028 | Keshen | 1.055 |
| Keping | 1.003 | Jin Lu | 1.033 | Markit County | 1.043 |
| Shache county | 1.058 | Yecheng | 1.057 | Shule | 1.058 |
| Yingjisha | 1.062 | Upper Atushi | 1.057 | Wuqia | 1.059 |
| Deep noise made in coughing or vomiting | 1.057 | The noise made in coughing or vomiting hair second phase | 1.057 | Noise made in coughing or vomiting sent out for three phases | 1.057 |
| Shufu | 1.057 | Austria is according to Plutarch | 1.051 | Gai Zi | 1.049 |
| Boulogne mouthful | 1.048 |
In order to be preferably adjusted to boundary south area power grid voltage, using golden deer, Markit County, Shache county, Yingjisha, it is difficult to understand according to
The generator operation as synchronous condenser ability of Plutarch node photovoltaic DC-to-AC converter carries out pressure regulation to statements based on collusion circuit.Each node control strategy power for calculating
A and b are as shown in table 2 for weight coefficient.
Each node control strategy weight coefficient of table 2
Boundary south each node voltage of area power grid is as shown in table 3 after pressure regulation.From table 3 it is observed that each node voltage is tieed up
Hold 0.98 --- between 1.02p.u., meet line voltage requirement.All photovoltaic DC-to-AC converters both participate in line voltage regulation, nothing
Work(absorbs total amount compared to useIt is low during control strategy, while electric network active, reactive loss are small.
Boundary south each node voltage of area power grid after the pressure regulation of table 3
Claims (5)
1. a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation, it is characterised in that comprise the following steps：
Step 1：Generator in power network, transformer, circuit, load are carried out into equivalent treatment, network equivalence model is set up；
Step 2：Load flow calculation is carried out to network equivalence model, Power Flow Information, including each node voltage, the active nothing of each branch road is obtained
Work(power；
Step 3：Judge photovoltaic system grid entry point voltage UiScope, if 0.95p.u.≤Ui≤ 1.05p.u., then directly terminate, no
Then carry out step 4；
Step 4：The idle output valve Q of photovoltaic system is calculated according to Q (U) control strategy based on grid entry point voltage magnitudeui, according to base
In active outputControl strategy calculates the idle output valve Q of photovoltaic systempi；
Step 5：Q (U) control strategy based on grid entry point voltage magnitude is set and calculates the idle output valve Q of photovoltaic systemuiWeight system
Number initial value a=1, is set based on active outputControl strategy calculates the idle output valve Q of photovoltaic systempiWeight system
Number initial value b=0；
Step 6：Judge QpiWeight coefficient b, directly terminates if b >=1, otherwise carries out step 7；
Step 7：Calculate the idle output valve Q of photovoltaic systemi, its expression formula is
Qi=aQui+bQpi (4)
In formula：QuiIt is the idle output valve of photovoltaic system that Q (U) control strategy based on grid entry point voltage magnitude is calculated, a is it
Weight coefficient, QpiIt is based on active outputThe idle output valve of photovoltaic system that control strategy is calculated, b is weighed for it
Weight coefficient；
Step 8：Judge the idle output valve Q of photovoltaic systemiSize, if Qi=Qim, then directly terminate, otherwise carry out step 9, QimFor
Photovoltaic system is idle output capacity；
Step 9：Judge photovoltaic system grid entry point voltage UiScope, if 0.95p.u.≤Ui≤ 1.05p.u., then directly terminate, no
Then carry out step 10；
Step 10：Adjustment weight coefficient a, b step-length, return to step 6.
2. a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation according to claim 1, it is characterised in that：
The adjusting step of weight coefficient a, b is configured according to the requirement of response speed in the step 10.
3. a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation according to claim 2, it is characterised in that：
It is a=a-0.05, b=b+0.05 that weight coefficient a, b step-length are adjusted in the step 10.
4. a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation according to claim 1, it is characterised in that：
The idle output valve Q of photovoltaic system is calculated according to Q (U) control strategy based on grid entry point voltage magnitude in step 4ui, its expression formula
For
In formula：Q (U) control strategy directly gathers voltage U at photovoltaic system grid entry pointi, U1、U2、U3、U4The magnitude of voltage of expression according to
Actual electric network requirement determination, QimaxThe maximum of idle output during rated output active for photovoltaic system.
5. a kind of statements based on collusion circuit pressure regulation method based on photovoltaic DC-to-AC converter phase modulation according to claim 4, it is characterised in that：
Basis is based on active output in step 4Control strategy calculates the idle output valve Q of photovoltaic systempi, its expression formula is：
Wherein,Control strategy is according to photovoltaic system active power output P setting power factor values by C1It is changed into C2, its expression formula
For：
In formula：C1=1, C2=0.9, PimIt is active nominal output values, P1=Pim/ 2, P2=Pim。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107196316A (en) * | 2017-06-21 | 2017-09-22 | 上海电力学院 | Multistage reactive voltage control method for coordinating in active distribution network |
| CN110011321A (en) * | 2019-04-03 | 2019-07-12 | 国网江西省电力有限公司电力科学研究院 | A kind of distributed photovoltaic variable slope droop control method based on head end voltage tracking |
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| CN105406488A (en) * | 2015-12-15 | 2016-03-16 | 武汉大学 | Overvoltage inhibition method based on reactive power regulation of photovoltaic inverter |
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| CN104767221A (en) * | 2015-04-21 | 2015-07-08 | 国家电网公司 | Voltage regulation method based on inverter power coordination control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196316A (en) * | 2017-06-21 | 2017-09-22 | 上海电力学院 | Multistage reactive voltage control method for coordinating in active distribution network |
| CN107196316B (en) * | 2017-06-21 | 2019-12-27 | 上海电力学院 | Multi-stage reactive voltage coordination control method in active power distribution network |
| CN110011321A (en) * | 2019-04-03 | 2019-07-12 | 国网江西省电力有限公司电力科学研究院 | A kind of distributed photovoltaic variable slope droop control method based on head end voltage tracking |
| CN110011321B (en) * | 2019-04-03 | 2023-02-14 | 国网江西省电力有限公司电力科学研究院 | Distributed photovoltaic variable slope droop control method based on head end voltage tracking |
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