CN102810872A - Power compensation method and power compensation system for power distribution network - Google Patents
Power compensation method and power compensation system for power distribution network Download PDFInfo
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- CN102810872A CN102810872A CN2012103008788A CN201210300878A CN102810872A CN 102810872 A CN102810872 A CN 102810872A CN 2012103008788 A CN2012103008788 A CN 2012103008788A CN 201210300878 A CN201210300878 A CN 201210300878A CN 102810872 A CN102810872 A CN 102810872A
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- 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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- 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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Abstract
The invention provides a power compensation method for a power distribution network. The power compensation method comprises the steps of: sampling three-phase load current of the power distribution network; converting the three-phase load current of the power distribution network from analog signals into digital signals; acquiring reactive current required to be compensated, harmonic compensation instructional current and reactive compensation instructional current according to the three-phase load current of the power distribution network after the three-phase load current is converted into the digital signals; performing harmonic compensation for the power distribution network according to the harmonic compensation instructional current; stopping reactive compensation when the change rate of the reactive compensation instructional current is greater than a preset value; and performing reactive compensation according to reactive current required to be compensated and the reactive compensation instructional current when the change rate of the reactive compensation instructional current is smaller than the preset value. The invention also provides a power compensation system for the power distribution network, and the stability and the reliability of the power distribution network can be improved.
Description
Technical field
The present invention relates to power distribution net security control field, particularly relate to a kind of power compensating method and system of power distribution network.
Background technology
Instantly the subject matter that faces of system for distribution network of power is how for the user safety, reliable, high-quality, economic electric energy to be provided.Along with the development of modern industrial technology, power electronic equipment is increasingly extensive to be applied to electric power system, and the harm of reactive power deficiency harmonic becomes increasingly conspicuous.Therefore the reactive power compensation harmonic suppresses just for realizing that the appeal target seems particularly important.In traditional electric power system, two kinds of equipment of reactive power compensation harmonic compensation independent operating separately, do not have intercommunication and data fusion mutually between the compensation of reactive power compensation harmonic.Its shortcoming is remarkable, as: the impact that the impulse current that the dynamic reactive compensator switched capacitor brings brings Active Power Filter-APF; The dynamic reactive compensator low-response, the Active Power Filter-APF response is fast.
Therefore; Need reactive power compensation harmonic compensation integration is got up to use, but in the present method, be both simple parallel runnings; Situation such as frequent switching capacitor appear in dynamic reactive compensator; Vibration appears in system easily like this, shows as Active Power Filter-APF and occurs overcurrent suddenly, and stability is not high; Shorten equipment life easily in addition, weight person causes that catastrophic effect appears in other equipment in the power distribution station, and reliability is not high.
Summary of the invention
The objective of the invention is to propose a kind of power compensating method and system of power distribution network, can improve the stability and the reliability of power distribution network.
The technical scheme that adopts is in order to achieve the above object:
A kind of power compensating method of power distribution network comprises step:
The threephase load electric current of sampling power distribution network;
Threephase load electric current with said power distribution network has analog signal conversion to become digital signal;
Need to obtain reactive current, harmonic compensation instruction current and the reactive power compensation instruction current of compensation according to the threephase load electric current that converts the said power distribution network after the digital signal to;
According to said harmonic compensation instruction current power distribution network is carried out harmonic compensation;
When the rate of change of said reactive power compensation instruction current during, do not carry out reactive power compensation greater than preset value; When the rate of change of said reactive power compensation instruction current during, carry out reactive power compensation according to the said reactive current and the said reactive power compensation instruction current of compensation of needing less than said preset value.
And a kind of power compensating system of power distribution network comprises: current sampling circuit, analog to digital converter, digital signal processor, harmonic compensation circuit, reactive power compensation circuits for triggering and reactive power compensation circuit;
Wherein, said current sampling circuit connects said analog to digital converter; Said analog to digital converter connects said digital signal processor; Said digital signal processor connects said harmonic compensation circuit and said reactive power compensation circuits for triggering; One end of said reactive power compensation circuits for triggering, said harmonic compensation circuit connects said reactive power compensation circuit respectively; The other end of said harmonic compensation circuit connects the distribution network system side;
The threephase load electric current of said sample circuit sampling power distribution network;
Said analog to digital converter becomes digital signal with the threephase load electric current of the power distribution network of said sample circuit sampling by analog signal conversion;
Said digital signal processor basis converts reactive current, harmonic compensation instruction current and the reactive power compensation instruction current of the threephase load electric current acquisition need compensation of the said power distribution network after the digital signal to;
Said harmonic compensation circuit carries out harmonic compensation according to said harmonic compensation instruction current to power distribution network;
The rate of change of judging said reactive power compensation instruction current when said reactive power compensation circuits for triggering is during greater than preset value, and said reactive power compensation circuit does not carry out reactive power compensation;
The rate of change of judging said reactive power compensation instruction current when said reactive power compensation circuits for triggering is during less than said preset value, and said reactive power compensation circuit carries out reactive power compensation according to the said reactive current and the said reactive power compensation instruction current of compensation of needing.
The present invention's power distribution network threephase load electric current of sampling utilizes idle Theoretical Calculation to go out to need the reactive current of compensation then, and calculates harmonic compensation instruction current and reactive power compensation instruction current according to the threephase load electric current; Carry out harmonic compensation according to the harmonic compensation instruction current; Before carrying out reactive power compensation, need consider that also whether the rate of change of reactive power compensation instruction current satisfies preset value, just drop into the capacitor group and carry out reactive power compensation, make that like this stability of a system is good, reliability is high if satisfy.
Description of drawings
Fig. 1 is an embodiment flow chart of the inventive method;
Fig. 2 is a structural representation of system of the present invention;
Fig. 3 is an application sketch map of system of the present invention.
Embodiment
For ease of understanding the present invention, below will be in conjunction with the accompanying drawings.
The present invention proposes a kind of power compensating method of power distribution network, please refer to Fig. 1, comprises step:
The threephase load electric current of S101, sampling power distribution network;
S102, with the threephase load electric current of power distribution network, become digital signal by analog signal conversion;
S103, basis convert reactive current, harmonic compensation instruction current and the reactive power compensation instruction current of the threephase load electric current acquisition need compensation of the power distribution network after the digital signal to;
S104, power distribution network is carried out harmonic compensation according to the harmonic compensation instruction current;
S105, when the rate of change of reactive power compensation instruction current during greater than preset value, do not carry out reactive power compensation; When the rate of change of reactive power compensation instruction current during, carry out reactive power compensation according to the reactive current and the reactive power compensation instruction current of need compensation less than preset value.
The present invention's power distribution network threephase load electric current of sampling utilizes idle Theoretical Calculation to go out to need the reactive current of compensation then, and calculates harmonic compensation instruction current and reactive power compensation instruction current according to the threephase load electric current; Carry out harmonic compensation according to the harmonic compensation instruction current; Before carrying out reactive power compensation, need consider that also whether the rate of change of reactive power compensation instruction current satisfies preset value, just drop into the capacitor group and carry out reactive power compensation, make that like this stability of a system is good, reliability is high if satisfy.
For better understanding the present invention, will set forth the present invention from following steps:
One, the threephase load electric current of sampling power distribution network;
The threephase load electric current of sampling power distribution network obtains three-phase current and is respectively i
a, i
bAnd i
c
Two, with the threephase load electric current of power distribution network, become digital signal by analog signal conversion;
Three,, calculate the harmonic compensation instruction current according to the threephase load electric current after the digital translation;
Concrete computational methods can be undertaken by general computational methods, and concrete computational process repeats no more here.
Four,, calculate the reactive current and the reactive power compensation instruction current that need compensation according to the threephase load electric current after the digital translation;
A, according to the threephase load electric current after the digital translation, calculate to need the reactive current of compensation, can obtain according to the instantaneous reactive Theoretical Calculation, concrete computational process repeats no more here;
B, according to the threephase load electric current after the digital translation, when calculating the reactive power compensation instruction current, can carry out according to following mode:
Utilize following formula to calculate instantaneous reactive power;
Wherein, i
qBe instantaneous reactive power; i
pBe instantaneous active power; i
a, i
bAnd i
cBe the threephase load electric current; i
qFor instantaneous reactive power comprises fundamental wave reactive power power harmonic reactive power; Therefore need that instantaneous reactive power is carried out harmonic and handle, can use low pass filter to realize, can obtain fundamental reactive current through after the LPF; Concrete, the processing mode of LPF is: use following equality to handle y (n+1)=(1-f) y (n)+x (n) f;
Wherein, y (n+1) is the current output of low pass filter, that is, and and current fundamental reactive current value; Y (n) is fundamental reactive current value that sampled point is corresponding on the low pass filter; X (n) is current instantaneous reactive power i
q, f is the characteristic value of cut-off frequency.Can choose cut-off frequency is 2Hz, promptly weighs cut-off frequency f=0.001.When system voltage one timing;
represents the reactive current effective value of load, and the reactive current effective value of this load is the reactive power compensation instruction current of being asked.
Wherein, step 3 and step 4 do not have sequencing, can carry out simultaneously.
Five, according to the harmonic compensation instruction current power distribution network is carried out harmonic compensation;
The harmonic compensation mode can repeat no more by harmonic compensation mode commonly used here.
Six, carry out reactive power compensation according to the reactive power compensation instruction current.
(1) asks for the rate of change dI of reactive power compensation instruction current
Lq/ dt;
(2) compare the rate of change of reactive power compensation instruction current and the size of the value of presetting;
(3) when the rate of change of reactive power compensation instruction current during, do not carry out reactive power compensation greater than preset value;
(4), carry out reactive power compensation according to the reactive current and the reactive power compensation instruction current of need compensation when the rate of change of reactive power compensation instruction current during less than preset value.Understand for convenient, describe with an object lesson below: suppose to have 3 group capacitors.The reactive compensation capacity that 3 group capacitors can be realized has 8 kinds of combinations, the reactive current of compensation is pressed to compile from small to large be I
0, I
1I
7
Confirm the mapping relations one by one of reactive compensation capacity and switching combination, i.e. I
0, I
1I
7Respectively corresponding switching combination C
0, C
1C
7Work as I
LqSatisfy I
j<i
Lq＜I
J+1, and dI
Lq/ dt>During Δ, wherein, Δ is preset value, and the expression reactive load is in the transient process, and the switching state that keep the capacitor group this moment is constant;
Work as I
LqSatisfy I
j<i
Lq<i
J+1, and dI
Lq/ dt<during Δ, select switching combination C
j(j=1,2 ..., 7) the switching state of capacitor group is upgraded.Concrete update mode is through controller, to drop into and excise capacitor until I
LqConvergence is 0.
The invention allows for a kind of power compensating system of power distribution network; With reference to figure 2, comprising: current sampling circuit 201, analog to digital converter 202, digital signal processor 203, harmonic compensation circuit 204, reactive power compensation circuits for triggering 205 and reactive power compensation circuit 206;
Wherein, current sampling circuit 201 connection mode number converters 202; Analog to digital converter 202 linking number word signal processors 203; Digital signal processor 203 connects harmonic compensation circuit 204 and reactive power compensation circuits for triggering 205; One end of reactive power compensation circuits for triggering 205, harmonic compensation circuit 204 connects reactive power compensation circuit 206 respectively; The other end of harmonic compensation circuit 204 connects the distribution network system side;
The threephase load electric current of sample circuit 201 sampling power distribution networks;
Analog to digital converter 202 becomes digital signal with the threephase load electric current of the power distribution network of sample circuit sampling by analog signal conversion;
The rate of change of judging the reactive power compensation instruction currents when reactive power compensation circuits for triggering 205 is during greater than preset value, and reactive power compensation circuit 206 does not carry out reactive power compensation;
The rate of change of judging the reactive power compensation instruction currents when reactive power compensation circuits for triggering 205 is during less than preset value, and reactive power compensation circuit 206 carries out reactive power compensation according to the reactive current and the reactive power compensation instruction current of need compensation.
As a concrete example application of the present invention, see also Fig. 3, current sampling circuit 201 is gathered the threephase load electric current of current transformer 207 inductions of power distribution network load-side; The electric current of sampling is given digital signal processor 203 and is handled after changing through analog to digital converter 202, and concrete processing mode comprises:
Utilize the instantaneous reactive Theoretical Calculation to obtain the harmonic compensation instruction current;
Utilize following formula to calculate instantaneous reactive power;
Wherein, i
qBe instantaneous reactive power; i
pBe instantaneous active power; i
a, i
bAnd i
cBe the threephase load electric current; And instantaneous reactive power is carried out harmonic handle, obtain fundamental reactive current; Obtain the reactive power compensation instruction current according to fundamental reactive current.
When carrying out harmonic compensation, harmonic compensation circuit 204 provides the harmonic power compensation according to the harmonic compensation instruction current to the distribution network system side;
When triggering reactive power compensation, 206 pairs of reactive power compensation circuits need the reactive current of compensation to carry out ordering from small to large;
Need to confirm the reactive current of compensation and the one-to-one relationship of dynamic reactive compensator switching combination;
If I
j<i
Lq<i
J+1, and the rate of change of reactive power compensation instruction current then drops into I during less than preset value
jCorresponding dynamic reactive compensator switching combination; Wherein, I
jReactive current for the need compensation; I
LqBe the reactive power compensation instruction current.
Wherein, reactive power compensation circuit 206 comprises: controller 302, bidirectional triode thyristor 301 and capacitor group 303; Controller 302 connects reactive power compensation circuits for triggering 205; Controller 302 connects the control end of bidirectional triode thyristor 301; The other end of bidirectional triode thyristor 301 connects harmonic compensation circuit 204; The other end of bidirectional triode thyristor 301 connects an end of capacitor group 303; The other end ground connection of capacitor group 303.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (7)
1. the power compensating method of a power distribution network is characterized in that, comprises step:
The threephase load electric current of sampling power distribution network;
Threephase load electric current with said power distribution network becomes digital signal by analog signal conversion;
Need to obtain reactive current, harmonic compensation instruction current and the reactive power compensation instruction current of compensation according to the threephase load electric current that converts the said power distribution network after the digital signal to;
According to said harmonic compensation instruction current power distribution network is carried out harmonic compensation;
When the rate of change of said reactive power compensation instruction current during, do not carry out reactive power compensation greater than preset value; When the rate of change of said reactive power compensation instruction current during, carry out reactive power compensation according to the said reactive current and the said reactive power compensation instruction current of compensation of needing less than said preset value.
2. the power compensating method of power distribution network according to claim 1 is characterized in that,
The step that said threephase load electric current according to power distribution network obtains the reactive power compensation instruction current is specially:
Utilize following formula to calculate instantaneous reactive power;
Wherein, i
qBe instantaneous reactive power; i
pBe instantaneous active power; i
a, i
bAnd i
cBe said threephase load electric current;
Said instantaneous reactive power is carried out harmonic handle, obtain fundamental reactive current;
Obtain said reactive power compensation instruction current according to said fundamental reactive current.
3. the power compensating method of power distribution network according to claim 1 and 2 is characterized in that,
Said rate of change when the reactive power compensation instruction current is during less than said preset value, is specially according to the said reactive current of compensation and the step that said reactive power compensation instruction current carries out reactive power compensation of needing:
The said reactive current of compensation that needs is carried out ordering from small to large;
Confirm the said reactive current of compensation and the one-to-one relationship of dynamic reactive compensator switching combination of needing;
If I
j<iL
q<i
J+1, and the rate of change of said reactive power compensation instruction current drops into said I during less than said preset value
jCorresponding dynamic reactive compensator switching combination; Wherein, I
jReactive current for the need compensation; I
LqBe said reactive power compensation instruction current.
4. the power compensating system of a power distribution network is characterized in that, comprising: current sampling circuit, analog to digital converter, digital signal processor, harmonic compensation circuit, reactive power compensation circuits for triggering and reactive power compensation circuit;
Wherein, said current sampling circuit connects said analog to digital converter; Said analog to digital converter connects said digital signal processor; Said digital signal processor connects said harmonic compensation circuit and said reactive power compensation circuits for triggering; One end of said reactive power compensation circuits for triggering, said harmonic compensation circuit connects said reactive power compensation circuit respectively; The other end of said harmonic compensation circuit connects the distribution network system side;
The threephase load electric current of said sample circuit sampling power distribution network;
Said analog to digital converter becomes digital signal with the threephase load electric current of the power distribution network of said sample circuit sampling by analog signal conversion;
Said digital signal processor basis converts reactive current, harmonic compensation instruction current and the reactive power compensation instruction current of the threephase load electric current acquisition need compensation of the said power distribution network after the digital signal to;
Said harmonic compensation circuit carries out harmonic compensation according to said harmonic compensation instruction current to power distribution network;
The rate of change of judging said reactive power compensation instruction current when said reactive power compensation circuits for triggering is during greater than preset value, and said reactive power compensation circuit does not carry out reactive power compensation;
The rate of change of judging said reactive power compensation instruction current when said reactive power compensation circuits for triggering is during less than said preset value, and said reactive power compensation circuit carries out reactive power compensation according to the said reactive current and the said reactive power compensation instruction current of compensation of needing.
5. the power compensating system of power distribution network according to claim 4 is characterized in that,
The following formula of said digital signal processor by using calculates instantaneous reactive power;
Wherein, i
qBe instantaneous reactive power; i
pBe instantaneous active power; i
a, i
bAnd i
cBe said threephase load electric current;
And said instantaneous reactive power is carried out harmonic handle, obtain fundamental reactive current;
Obtain said reactive power compensation instruction current according to said fundamental reactive current.
6. the power compensating system of power distribution network according to claim 4 is characterized in that,
Said reactive power compensation circuit carries out ordering from small to large to the said reactive current of compensation that needs;
Confirm the said reactive current of compensation and the one-to-one relationship of dynamic reactive compensator switching combination of needing;
If I
j<i
Lq<i
J+1, and the rate of change of said reactive power compensation instruction current then drops into said I during less than said preset value
jCorresponding dynamic reactive compensator switching combination; Wherein, I
jReactive current for the need compensation; I
LqBe said reactive power compensation instruction current.
7. according to the power compensating system of each described power distribution network of claim 4 to 6, it is characterized in that,
Said reactive power compensation circuit comprises controller, bidirectional triode thyristor and capacitor group; Said controller connects said reactive power compensation circuits for triggering; Said controller connects the control end of said bidirectional triode thyristor; One end of said bidirectional triode thyristor connects said harmonic compensation circuit; The other end of said bidirectional triode thyristor connects an end of said capacitor group; The other end ground connection of said capacitor group.
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Cited By (3)
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| CN103091525A (en) * | 2012-12-28 | 2013-05-08 | 上海贝岭股份有限公司 | Electric energy measuring chip three phase wattful power measurement and crosstalk compensation method |
| CN105490274A (en) * | 2015-12-28 | 2016-04-13 | 国网山东省电力公司青岛供电公司 | Electric power quality control system and method for metro power supply system |
| CN106374478A (en) * | 2015-07-24 | 2017-02-01 | 利思电气（上海）有限公司 | Outdoor active power filter device with reactive power dispatch function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091525A (en) * | 2012-12-28 | 2013-05-08 | 上海贝岭股份有限公司 | Electric energy measuring chip three phase wattful power measurement and crosstalk compensation method |
| CN103091525B (en) * | 2012-12-28 | 2015-03-25 | 上海贝岭股份有限公司 | Electric energy measuring chip three phase wattful power measurement and crosstalk compensation method |
| CN106374478A (en) * | 2015-07-24 | 2017-02-01 | 利思电气（上海）有限公司 | Outdoor active power filter device with reactive power dispatch function |
| CN105490274A (en) * | 2015-12-28 | 2016-04-13 | 国网山东省电力公司青岛供电公司 | Electric power quality control system and method for metro power supply system |
| CN105490274B (en) * | 2015-12-28 | 2018-12-14 | 国网山东省电力公司青岛供电公司 | Electric power supply system for subway utility power quality control system and method |
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| CN102810872B (en) | 2015-04-22 |
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