CN105490274B - Electric power supply system for subway utility power quality control system and method - Google Patents
Electric power supply system for subway utility power quality control system and method Download PDFInfo
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- CN105490274B CN105490274B CN201511003795.2A CN201511003795A CN105490274B CN 105490274 B CN105490274 B CN 105490274B CN 201511003795 A CN201511003795 A CN 201511003795A CN 105490274 B CN105490274 B CN 105490274B
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- 238000003908 quality control method Methods 0.000 title claims abstract description 17
- 238000012806 monitoring device Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 6
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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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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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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- 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 present invention provides a kind of electric power supply system for subway utility power quality control system and method, comprising: acquisition device, for acquiring the voltage and current of high-pressure side and low-pressure side；Active filter, for according to collected voltage and current, harmonic current compensation value and reactive-current compensation value is calculated, the harmonic current compensation value is equal to the opposite number of the sum of harmonic current components of on high-tension side harmonic current components and low-pressure side, and the reactive-current compensation value is equal to the opposite number of the sum of reactive current component of on high-tension side reactive current component and low-pressure side；Monitoring device determines the operating mode of the active filter for the rated capacity according to the harmonic current compensation value, the reactive-current compensation value and the active filter；The operating mode according to the active filter, the harmonic current compensation value and reactive current value generation current compensation is also used to instruct and be sent to the active filter.
Description
Technical field
The present invention relates to electric power quality control and administer field, and in particular to a kind of electric power supply system for subway electric energy
Quality control system and method.
Background technique
With the continuous expansion of China's city size, frequently, transport need amount sharp increase, urban transportation supplies personnel's trip
Contradiction day is needed to be becoming tight, traffic above-ground has been unable to satisfy current transport need amount.Subway as at present in the world it is most economical and
One of efficient urban transportation tool, is rapidly developed in our each big and medium-sized cities.
China's electric power supply system for subway is mainly by main transformer station, traction substation, commutation system and several portions of power and lighting system
It is grouped as.Since traction load fluctuation is big in electric power supply system for subway and electric power supply system for subway uses cable connection, city is given
Power grid brings a series of unfavorable factors such as harmonic wave and reactive power releasing.Subway is typically among densely populated city, city electricity
Net once accident occurs, can bring very big influence to the power supply in entire city.For electric power supply system for subway, work as system loading
When heavier, the power factor of system is relatively high but harmonic content is also relatively high；When system is in underloading or stops carrying, system
Harmonic content is lower but power factor is relatively low, may also send with a large amount of capacitive reactive power.Currently, inhibiting subway power supply system
Idle method is main in harmonic wave and compensation electric power supply system for subway in system are as follows: installed in low-voltage distribution system active filter and
Electric capacitor reactive power compensator inhibits harmonic wave and compensating power respectively.Due to harmonics restraint in electric power supply system for subway and
Reactive compensation individually carries out, and does not carry out comprehensive treatment according to unified physical model, the case where often attending to one thing and lose sight of another,
Economic cost is caused to increase, the heavy workload installed and safeguarded, but also security risk can be formed to urban distribution network.
Summary of the invention
For this purpose, the present invention proposes a kind of electric power supply system for subway utility power quality control system and method, can solve existing
It cannot be to the harmonic wave in electric power supply system for subway and the technical issues of idle progress comprehensive treatment in technology.
Technical scheme is as follows:
A kind of electric power supply system for subway utility power quality control system, comprising:
Acquisition device, for acquiring the voltage and current of high-pressure side and low-pressure side；
Active filter, for harmonic current compensation value and idle electricity to be calculated according to collected voltage and current
Offset is flowed, the harmonic current compensation value is equal to the sum of on high-tension side harmonic current components and the harmonic current components of low-pressure side
Opposite number, the reactive-current compensation value be equal to the sum of on high-tension side reactive current component and the reactive current component of low-pressure side
Opposite number；
Monitoring device, for according to the harmonic current compensation value, the reactive-current compensation value and the active power filtering
The rated capacity of device determines the operating mode of the active filter；Be also used to the operating mode according to the active filter,
The harmonic current compensation value and the reactive current value generate current compensation and instruct and be sent to the active filter.
Preferably, the acquisition device includes:
High-voltage acquisition unit, for acquiring on high-tension side three-phase voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；With
Low pressure acquisition unit, for acquiring the three-phase voltage u of low pressure lateral loada2、ub2、uc2With three-phase current ia2、ib2、
ic2；
Wherein, voltage signal and the equal synchronous acquisition of current signal.
Preferably, the active filter includes:
Harmonic component and reactive component unit are calculated, for according to collected on high-tension side three-phase voltage and three-phase electricity
Stream, is calculated the harmonic component i of high-pressure side three-phase currentah1、ibh1And ich1And the reactive component of high-pressure side three-phase current
iaq1、ibq1And icq1；It is also used to the three-phase voltage and three-phase current according to collected low-pressure side, low-pressure side three-phase is calculated
The harmonic component i of electric currentah2、ibh2And ich2And the reactive component i of low-pressure side three-phase currentaq2、ibq2And icq2；
Harmonic current compensation value and reactive-current compensation value cell are calculated, for according to high-pressure side and low-pressure side three-phase current
Harmonic component, obtain the harmonic current compensation value: i* cah=-iah1-iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-
ich2；According to the reactive component of high-pressure side and low-pressure side three-phase current, the reactive-current compensation value: i is obtained* caq=-iaq1-
iaq2、i* cbq=-ibq1-ibq2And i* ccq=-icq1-icq2。
Preferably, the monitoring device includes:
Current compensation command unit is generated, for the operating mode according to active filter, the harmonic current compensation value
Current compensation, which is generated, with the reactive-current compensation value instructs and be sent to the active filter, the current compensation instruction
Are as follows: i* ca=A × i* cah+B×i* caq；i* cb=A × i* cbh+B×i* cbq；i* cc=A × i* cch+B×i* ccq, wherein 0≤A≤1,
The specific value of 0≤B≤1, A and B are determined by active filter working mode determination unit；
Active filter working mode determination unit, for being mended according to the harmonic current compensation value, the reactive current
The rated capacity of value and the active filter is repaid, harmonic wave ratio Kh and idle ratio Kq is calculated and determines the active filter
Operating mode, wherein
As the harmonic wave ratio Kh >=100%, the active filter, which works in, only mends harmonic mode, the value of A and B
Are as follows: A=1, B=0；
When the 100% > Kh > first threshold of harmonic wave ratio, the active filter works in harmonic wave mode of priority,
The value of A and B are as follows: 0 < B < A < 1；
When the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq > third threshold value, or
The harmonic wave ratio Kh < second threshold and when the idle ratio Kq < 100%, the active filter works in idle
The value of mode of priority, A and B are as follows: 0 < A < B < 1；
It is described when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq≤third threshold value
Active filter works in full compensation model, the value of A and B are as follows: A=1, B=1；
When the harmonic wave ratio Kh < second threshold and the idle ratio Kq >=100%, the active filter work
Make in only to mend idle mode, the value of A and B are as follows: A=0, B=1；
Preferably, the calculating harmonic component and reactive component unit are based on Instantaneous Power Theory and calculate harmonic component and nothing
Function component.
A kind of electric power supply system for subway electric energy quality control method, includes the following steps:
Obtain the voltage and current of high-pressure side and low-pressure side；
According to the voltage and current got, harmonic current compensation value and reactive-current compensation value is calculated, it is described humorous
Wave current offset values are equal to the opposite number of the sum of harmonic current components of on high-tension side harmonic current components and low-pressure side, the nothing
Function current offset values are equal to the opposite number of the sum of reactive current component of on high-tension side reactive current component and low-pressure side；
Obtain the rated capacity of active filter；
According to the harmonic current compensation value, the rated capacity of the reactive-current compensation value and the active filter,
Determine the operating mode of the active filter；
Electricity is generated according to the operating mode of the active filter, the harmonic current compensation value and the reactive current value
Stream compensating instruction is simultaneously sent to the active filter.
Preferably, the step of voltage and current for obtaining high-pressure side and low-pressure side includes:
Obtain on high-tension side three-phase voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；With
Obtain the three-phase voltage u of low pressure lateral loada2、ub2、uc2With three-phase current ia2、ib2、ic2；
Wherein, voltage signal and the equal synchronous acquisition of current signal.
Preferably, the calculating harmonic current compensation value and the step of reactive-current compensation value, include:
According to the on high-tension side three-phase voltage and three-phase current got, the harmonic wave point of high-pressure side three-phase current is calculated
Measure iah1、ibh1And ich1And the reactive component i of high-pressure side three-phase currentaq1、ibq1And icq1；And according to the low-pressure side got
Three-phase voltage and three-phase current, the harmonic component i of low-pressure side three-phase current is calculatedah2、ibh2And ich2And low-pressure side
The reactive component i of three-phase currentaq2、ibq2And icq2；
According to the harmonic component of high-pressure side and low-pressure side three-phase current, the harmonic current compensation value: i is obtained* cah=-
iah1-iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-ich2；According to the reactive component of high-pressure side and low-pressure side three-phase current, obtain
To the reactive-current compensation value: i* caq=-iaq1-iaq2、i* cbq=-ibq1-ibq2And i* ccq=-icq1-icq2。
Preferably, described according to the operating mode of active filter, the harmonic current compensation value and the reactive current
Offset generate current compensation instruction the step of include:
The current compensation instruction are as follows: i* ca=A × i* cah+B×i* caq；i* cb=A × i* cbh+B×i* cbq；i* cc=A ×
i* cch+B×i* ccq, wherein the specific value of 0≤A≤1,0≤B≤1, A and B are determined by active filter operating mode；
It is described according to the harmonic current compensation value, the specified appearance of the reactive-current compensation value and the active filter
Amount, the step of determining the operating mode of the active filter include:
Calculate harmonic wave ratio Kh and idle ratio Kq；
As the harmonic wave ratio Kh >=100%, the active filter, which works in, only mends harmonic mode, the value of A and B
Are as follows: A=1, B=0；
When the 100% > Kh > first threshold of harmonic wave ratio, the active filter works in harmonic wave mode of priority,
The value of A and B are as follows: 0 < B < A < 1；
When the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq > third threshold value, or
The harmonic wave ratio Kh < second threshold and when the idle ratio Kq < 100%, the active filter works in idle
The value of mode of priority, A and B are as follows: 0 < A < B < 1；
It is described when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq≤third threshold value
Active filter works in full compensation model, the value of A and B are as follows: A=1, B=1；
When the harmonic wave ratio Kh < second threshold and the idle ratio Kq >=100%, the active filter work
Make in only to mend idle mode, the value of A and B are as follows: A=0, B=1；
It is preferably based on Instantaneous Power Theory and calculates harmonic component and reactive component.
The above technical solution of the present invention has the following advantages over the prior art:
The present invention provides a kind of electric power supply system for subway utility power quality control system and method, while acquiring high-pressure side and low
The voltage and current of side is pressed, so that the instruction of finally obtained current compensation is more accurate；Meanwhile by high-pressure side and low-pressure side load
Fundamental wave reactive power and harmonic signal in signal extract respectively, and according to load operating conditions (harmonic current compensation value and nothing
Function current offset values) determine the operating mode (compensation model) of active filter with the rated capacity of active filter, and according to
Operating mode, harmonic current compensation value and reactive current value generate current compensation instruction.The system and method have comprehensively considered electricity
Reactive power present in net and harmonic signal carry out comprehensive treatment, high reliablity according to unified physical model to it；Together
When, which can be according to load operating conditions adjust automatically operating mode, so that distribution system is in whole service rank
Section all has higher power quality, improves the safety and reliability of electricity consumption.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the schematic diagram of one of embodiment of the present invention 1 electric power supply system for subway utility power quality control system；
Fig. 2 is the flow chart of the calculating harmonic current compensation value in the embodiment of the present invention 1；
Fig. 3 is the flow chart of the calculating reactive-current compensation value in the embodiment of the present invention 1；
Fig. 4 is the flow chart for generating current compensation instruction in the embodiment of the present invention 1；
Fig. 5 is the flow chart of one of embodiment of the present invention 2 electric power supply system for subway electric energy quality control method.
Specific embodiment
Embodiment 1
As shown in Figure 1, may include: the present embodiment provides a kind of electric power supply system for subway utility power quality control system
Acquisition device (Fig. 1 is not shown), for acquiring the voltage and current of high-pressure side and low-pressure side.
As a kind of specific implementation, acquisition device can be specifically included: high-voltage acquisition unit, for acquiring high-pressure side
Three-phase voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；Low pressure acquisition unit, for acquiring the three-phase of low pressure lateral load
Voltage ua2、ub2、uc2With three-phase current ia2、ib2、ic2.Wherein, voltage signal and the equal synchronous acquisition of current signal.High-voltage acquisition list
The voltage and current that member and low pressure acquisition unit acquire required for being realized by voltage sensor and current sensor.
Active filter, for harmonic current compensation value and idle electricity to be calculated according to collected voltage and current
Offset is flowed, harmonic current compensation value is equal to the phase of on high-tension side harmonic current components and the sum of the harmonic current components of low-pressure side
Anti- number, it is opposite with the sum of the reactive current component of low-pressure side that reactive-current compensation value is equal on high-tension side reactive current component
Number.
As a kind of specific implementation, active filter can be specifically included:
Harmonic component and reactive component unit are calculated, for according to collected on high-tension side three-phase voltage and three-phase electricity
Stream, is calculated the harmonic component i of high-pressure side three-phase currentah1、ibh1And ich1And the reactive component of high-pressure side three-phase current
iaq1、ibq1And icq1；It is also used to the three-phase voltage and three-phase current according to collected low-pressure side, low-pressure side three-phase is calculated
The harmonic component i of electric currentah2、ibh2And ich2And the reactive component i of low-pressure side three-phase currentaq2、ibq2And icq2。
Harmonic current compensation value and reactive-current compensation value cell are calculated, for according to high-pressure side and low-pressure side three-phase current
Harmonic component, obtain harmonic current compensation value: i* cah=-iah1-iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-ich2；Root
According to the reactive component of high-pressure side and low-pressure side three-phase current, reactive-current compensation value: i is obtained* caq=-iaq1-iaq2、i* cbq=-
ibq1-ibq2And i* ccq=-icq1-icq2。
Monitoring device, for the rated capacity according to harmonic current compensation value, reactive-current compensation value and active filter,
Determine the operating mode of active filter；It is also used to the operating mode according to active filter, harmonic current compensation value and idle
Current value generates current compensation and instructs and be sent to active filter.
As a kind of specific implementation, monitoring device can be specifically included:
Current compensation command unit is generated, for according to the operating mode of active filter, harmonic current compensation value and nothing
Function current offset values generate current compensation and instruct and be sent to active filter, current compensation instruction are as follows: i* ca=A × i* cah+B
×i* caq；i* cb=A × i* cbh+B×i* cbq；i* cc=A × i* cch+B×i* ccq, wherein the tool of 0≤A≤1,0≤B≤1, A and B
Body value is determined by active filter working mode determination unit；
Active filter working mode determination unit, for according to harmonic current compensation value, reactive-current compensation value and having
The rated capacity of source filter, calculate harmonic wave ratio Kh (the ratio between required compensation harmonic capacity and active filter rated capacity) and
Idle ratio Kq (the ratio between required compensating reactive power capacity and active filter rated capacity) and the work for determining the active filter
Operation mode, wherein
As harmonic wave ratio Kh >=100%, active filter, which works in, only mends harmonic mode, the value of A and B are as follows: A=1,
B=0；
When 100% > Kh > first threshold of harmonic wave ratio, active filter works in harmonic wave mode of priority, and A and B's takes
Value are as follows: 0 < B < A < 1；Wherein, first threshold value can be 70%.
When harmonic wave ratio first threshold >=Kh >=second threshold and idle ratio Kq > third threshold value or harmonic wave ratio
Kh < second threshold and when idle ratio Kq < 100%, active filter works in idle mode of priority, the value of A and B
Are as follows: 0 < A < B < 1；Wherein, second threshold value can be 10%；Third threshold value value can be 70%.
When harmonic wave ratio first threshold >=Kh >=second threshold and idle ratio Kq≤third threshold value, active filter work
Make in full compensation model, the value of A and B are as follows: A=1, B=1.
When harmonic wave ratio Kh < second threshold and the idle ratio Kq >=100%, active filter, which works in, only to be mended
The value of idle mode, A and B are as follows: A=0, B=1.
Electric power supply system for subway utility power quality control system provided in this embodiment, while acquiring high-pressure side and low-pressure side
Voltage and current, so that the instruction of finally obtained current compensation is more accurate；Meanwhile it will be in high-pressure side and low-pressure side load signal
Fundamental wave reactive power and harmonic signal extract respectively, and according to load operating conditions (harmonic current compensation value and reactive current
Offset) operating mode (compensation model) of active filter is determined with the rated capacity of active filter, and according to Working mould
Formula, harmonic current compensation value and reactive current value generate current compensation instruction.The system and method, which have comprehensively considered in power grid, deposits
Reactive power and harmonic signal, comprehensive treatment, high reliablity are carried out according to unified physical model to it；Meanwhile this is
System and method can be according to load operating conditions adjust automatically operating modes, so that distribution system all has in the whole service stage
Higher power quality improves the safety and reliability of electricity consumption.
The process for generating current compensation instruction is illustrated below with reference to Fig. 2, Fig. 3 and Fig. 4.
In following example, on high-tension side voltage is 35kV, corresponding on high-tension side three-phase voltage ua1、ub1、uc1Are as follows:
ua35kV、ub35kV、uc35kV；On high-tension side three-phase current ia1、ib1、ic1Are as follows: ia35kV、ib35kV、ic35kV；High-pressure side three-phase current
Harmonic component iah1、ibh1、ich1Are as follows: iah35kV、ibh35kV、ich35kV；The reactive component i of high-pressure side three-phase currentaq1、ibq1、icq1
Are as follows: iaq35kV、ibq35kV、icq35kV；
The voltage of low-pressure side is 1140V, the three-phase voltage u of corresponding low-pressure sidea2、ub2、uc2Are as follows: ua1 140V、ub1 140V、
uc1 140V；The three-phase current i of low-pressure sidea2、ib2、ic2Are as follows: ia1 140V、ib1 140V、ic1 140V；The harmonic wave of low-pressure side three-phase current point
Measure iah2、ibh2、ich2Are as follows: iah1 140V、ibh1 140V、ich1 140V；The reactive component i of low-pressure side three-phase currentaq2、ibq2And icq2Are as follows:
iaq1 140V、ibq1 140V、icq1 140V。
Currently known harmonic detecting method includes: bandreject filtering method, FFT transform method, band logical frequency selection method, self-adapting detecting
Method and instantaneous reactive power theory method etc..Wherein, the circuit structure based on instantaneous reactive power theory method is simple, and performance is good
Good, feasibility is high, and real-time is good, so harmonic component and nothing is calculated based on instantaneous reactive power theory method in this system
Function component.
Illustrate to obtain the detailed process of harmonic current compensation value below with reference to Fig. 2, using d-q method to high-pressure side harmonic current
It is detected:
By on high-tension side three-phase current ia35kV、ib35kV、ic35kVIt converts to obtain i by CLARKE transformation and PARKdAnd iq, tool
Body transformation is as follows:
In formula (1),
idAnd iqAfter low-pass filter (LPF) filtering, DC component is obtainedWithAgain willWithInverse transformation is just
The fundametal compoment i of detection electric current can be found outaf、ibf、icf。
By iaf、ibf、icfWith ia35kV、ib35kV、ic35kVSubtract each other, high-pressure side three-phase current i can be acquireda35kV、ib35kV、
ic35kVHarmonic component iah35kV、ibh35kV、ich35kV；
Similarly, three-phase current i can be loaded in the hope of low-pressure sidea1 140V、ib1 140V、ic1 140VHarmonic component iah1 140V、
ibh1 140V、ich1 140V；
According to the harmonic component of high-pressure side and low-pressure side three-phase current, harmonic current compensation value is obtained are as follows:
Negative sign in formula (3) indicates that compensation electric current is equal with harmonic current, contrary.
Illustrate the detailed process that reactive-current compensation value is calculated below with reference to Fig. 3, reactive-current compensation value is also by wink
When acquired without works, seek high-pressure side reactive current component first:
High-pressure side three-phase current i can be acquired according to Fig. 3a35kV、ib35kV、ic35kVReactive component iaq35kV、ibq35kV、
icq35kV；
Similarly, three-phase current i can be loaded in the hope of low-pressure sidea1 140V、ib1 140V、ic1 140VReactive component iaq1 140V、
ibq1 140V、icq1 140V；
According to the reactive component of high-pressure side and low-pressure side three-phase current, reactive-current compensation value is obtained are as follows:
Negative sign in formula (4) indicates that compensation electric current is equal with reactive current amplitude, contrary.
As shown in figure 4, total current compensation instruction is made of harmonic compensation instruction and reactive compensation instruction, specifically:
A and B in formula (5) are the Real-valued variable between 0~1, are determined by the operating mode of active filter, specifically such as
Shown in table 1, wherein Kh is the ratio between required compensation harmonic capacity and Active Power Filter-APF rated capacity；Kq is required compensation nothing
The ratio between power capacity amount and Active Power Filter-APF rated capacity；"×" expression is not considered.
Table 1:
| Operating mode | Harmonic wave ratio Kh | Idle ratio Kq | A and B relationship |
| Only mend harmonic wave | Kh >=100% | × | A=1, B=0 |
| Harmonic wave is preferential | 100% > Kh > 70% | × | A > B |
| It is idle preferential | 70% >=Kh >=10% | Kq > 70% | A < B |
| Full compensation | 70% >=Kh >=10% | Kq≤70% | A=1, B=1 |
| It only mends idle | Kh < 10% | Kq >=100% | A=0, B=1 |
| It is idle preferential | Kh < 10% | Kq < 100% | A < B |
According to table 1 it can be seen that
Work as A=1, B=1, filter works in full compensation model；
Work as A=0, B=1, idle mode is only being mended in filter work；
Work as A=1, B=0, harmonic mode is only being mended in filter work；
As A < B, filter works in idle mode of priority；
As A > B, filter works in harmonic wave mode of priority；
For electric power supply system for subway, when system loading is in when overloaded, active filter works in harmonic wave mode of priority；When
System loading is at light load, and active filter works in idle mode of priority；It is likely to result in system harmonics content is higher
When electrical equipment can not work normally, active filter, which can work, is only mending harmonic wave state；It is more not only in system capacitive reactive power
Lead to waste of energy, it is also possible to which when influencing system stabilization, active filter, which can work, is only mending idle state.It can be seen that
Active filter in system provided in this embodiment has multiple-working mode, and automatic adjust can be instructed according to load operating conditions
Whole operating mode improves the safety of electricity consumption so that distribution system all has higher power quality in the whole service stage
And reliability.
Embodiment 2
As shown in figure 5, may include walking as follows the present embodiment provides a kind of electric power supply system for subway electric energy quality control method
It is rapid:
S1: the voltage and current of high-pressure side and low-pressure side is obtained.The step can specifically include: obtain on high-tension side three-phase
Voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；Obtain the three-phase voltage u of low pressure lateral loada2、ub2、uc2And three-phase current
ia2、ib2、ic2；Wherein, voltage signal and the equal synchronous acquisition of current signal.
S2: according to the voltage and current got, harmonic current compensation value and reactive-current compensation value, harmonic wave is calculated
Current offset values are equal to the opposite number of the sum of harmonic current components of on high-tension side harmonic current components and low-pressure side, reactive current
Offset is equal to the opposite number of the sum of reactive current component of on high-tension side reactive current component and low-pressure side.The step can be with base
Harmonic component and reactive component are calculated in Instantaneous Power Theory, can specifically include:
Firstly, high-pressure side three-phase current is calculated according to the on high-tension side three-phase voltage and three-phase current that get
Harmonic component iah1、ibh1And ich1And the reactive component i of high-pressure side three-phase currentaq1、ibq1And icq1；And according to getting
The harmonic component i of low-pressure side three-phase current is calculated in the three-phase voltage and three-phase current of low-pressure sideah2、ibh2And ich2, and
The reactive component i of low-pressure side three-phase currentaq2、ibq2And icq2；
Secondly, obtaining harmonic current compensation value: i according to the harmonic component of high-pressure side and low-pressure side three-phase current* cah=-
iah1-iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-ich2；According to the reactive component of high-pressure side and low-pressure side three-phase current, obtain
To reactive-current compensation value: i* caq=-iaq1-iaq2、i* cbq=-ibq1-ibq2And i* ccq=-icq1-icq2。
S3: the rated capacity of active filter is obtained.
S4: according to harmonic current compensation value, the rated capacity of reactive-current compensation value and active filter, have described in determination
The operating mode of source filter.
S5: raw according to the operating mode of the active filter, the harmonic current compensation value and the reactive current value
It is instructed at current compensation and is sent to the active filter.
Step S4 and S5 are specifically as follows:
Current compensation instruction in step S5 are as follows: i* ca=A × i* cah+B×i* caq；i* cb=A × i* cbh+B×i* cbq；i* cc
=A × i* cch+B×i* ccq, wherein the specific value of 0≤A≤1,0≤B≤1, A and B are determined by active filter operating mode.
The process that the operating mode of filter determines in step S4 are as follows:
Calculate harmonic wave ratio Kh and idle ratio Kq；
As harmonic wave ratio Kh >=100%, active filter, which works in, only mends harmonic mode, the value of A and B are as follows: A=1,
B=0；
When 100% > Kh > first threshold of harmonic wave ratio, active filter works in harmonic wave mode of priority, and A and B's takes
Value are as follows: 0 < B < A < 1；
When harmonic wave ratio first threshold >=Kh >=second threshold and idle ratio Kq > third threshold value or harmonic wave ratio
Kh < second threshold and when idle ratio Kq < 100%, active filter works in idle mode of priority, the value of A and B
Are as follows: 0 < A < B < 1；
When harmonic wave ratio first threshold >=Kh >=second threshold and idle ratio Kq≤third threshold value, active filter work
Make in full compensation model, the value of A and B are as follows: A=1, B=1；
When harmonic wave ratio Kh < second threshold and idle ratio Kq >=100%, active filter work in only mend it is idle
The value of mode, A and B are as follows: A=0, B=1.
Electric power supply system for subway electric energy quality control method provided in this embodiment, while acquiring high-pressure side and low-pressure side
Voltage and current, so that the instruction of finally obtained current compensation is more accurate；Meanwhile it will be in high-pressure side and low-pressure side load signal
Fundamental wave reactive power and harmonic signal extract respectively, and according to load operating conditions (harmonic current compensation value and reactive current
Offset) operating mode (compensation model) of active filter is determined with the rated capacity of active filter, and according to Working mould
Formula, harmonic current compensation value and reactive current value generate current compensation instruction.The system and method, which have comprehensively considered in power grid, deposits
Reactive power and harmonic signal, comprehensive treatment, high reliablity are carried out according to unified physical model to it；Meanwhile this is
System and method can be according to load operating conditions adjust automatically operating modes, so that distribution system all has in the whole service stage
Higher power quality improves the safety and reliability of electricity consumption.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (8)
1. a kind of electric power supply system for subway utility power quality control system characterized by comprising
Acquisition device, for acquiring the voltage and current of high-pressure side and low-pressure side；
Active filter, for harmonic current compensation value being calculated and reactive current is mended according to collected voltage and current
Value is repaid, the harmonic current compensation value is equal to the phase of on high-tension side harmonic current components and the sum of the harmonic current components of low-pressure side
Anti- number, the reactive-current compensation value are equal to the phase of on high-tension side reactive current component and the sum of the reactive current component of low-pressure side
Anti- number；
Monitoring device, for according to the harmonic current compensation value, the reactive-current compensation value and the active filter
Rated capacity determines the operating mode of the active filter；It is also used to the operating mode according to the active filter, described
Harmonic current compensation value and the reactive-current compensation value generate current compensation and instruct and be sent to the active filter；
The monitoring device includes:
Current compensation command unit is generated, for according to the operating mode of active filter, the harmonic current compensation value and institute
It states reactive-current compensation value generation current compensation and instructs and be sent to the active filter, the current compensation instruction are as follows: i* ca
=A × i* cah+B×i* caq；i* cb=A × i* cbh+B×i* cbq；i* cc=A × i* cch+B×i* ccq, wherein 0≤A≤1,0≤B≤
The specific value of 1, A and B is determined by active filter working mode determination unit；
Wherein: i* cah、i* cbh、i* cchFor harmonic current compensation value；i* caq、i* cbq、i* ccqFor reactive-current compensation value；
Active filter working mode determination unit, for according to the harmonic current compensation value, the reactive-current compensation value
With the rated capacity of the active filter, calculates harmonic wave ratio Kh and idle ratio Kq and determine the work of the active filter
Operation mode, wherein
As the harmonic wave ratio Kh >=100%, the active filter, which works in, only mends harmonic mode, the value of A and B are as follows: A
=1, B=0；
When the 100% > Kh > first threshold of harmonic wave ratio, the active filter works in harmonic wave mode of priority, A and B
Value are as follows: 0 < B < A < 1；
It is when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq > third threshold value or described
Harmonic wave ratio Kh < second threshold and when the idle ratio Kq < 100%, the active filter works in idle preferential
The value of mode, A and B are as follows: 0 < A < B < 1；
It is described active when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq≤third threshold value
Filter works in full compensation model, the value of A and B are as follows: A=1, B=1；
When the harmonic wave ratio Kh < second threshold and the idle ratio Kq >=100%, the active filter is worked in
Only mend idle mode, the value of A and B are as follows: A=0, B=1.
2. system according to claim 1, which is characterized in that the acquisition device includes:
High-voltage acquisition unit, for acquiring on high-tension side three-phase voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；With
Low pressure acquisition unit, for acquiring the three-phase voltage u of low pressure lateral loada2、ub2、uc2With three-phase current ia2、ib2、ic2；
Wherein, voltage signal and the equal synchronous acquisition of current signal.
3. system according to claim 2, which is characterized in that the active filter includes:
Harmonic component and reactive component unit are calculated, for according to collected on high-tension side three-phase voltage and three-phase current, meter
Calculation obtains the harmonic component i of high-pressure side three-phase currentah1、ibh1And ich1And the reactive component i of high-pressure side three-phase currentaq1、
ibq1And icq1；It is also used to the three-phase voltage and three-phase current according to collected low-pressure side, low-pressure side three-phase current is calculated
Harmonic component iah2、ibh2And ich2And the reactive component i of low-pressure side three-phase currentaq2、ibq2And icq2；
Harmonic current compensation value and reactive-current compensation value cell are calculated, for according to the humorous of high-pressure side and low-pressure side three-phase current
Wave component obtains the harmonic current compensation value: i* cah=-iah1-iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-ich2；Root
According to the reactive component of high-pressure side and low-pressure side three-phase current, the reactive-current compensation value: i is obtained* caq=-iaq1-iaq2、i* cbq
=-ibq1-ibq2And i* ccq=-icq1-icq2。
4. system according to claim 3, which is characterized in that the calculating harmonic component and reactive component unit are based on wink
Shi Wugong theoretical calculation harmonic component and reactive component.
5. a kind of electric power supply system for subway electric energy quality control method, which comprises the steps of:
Obtain the voltage and current of high-pressure side and low-pressure side；
According to the voltage and current got, harmonic current compensation value and reactive-current compensation value, the harmonic wave electricity is calculated
Flow the opposite number that offset is equal to the sum of harmonic current components of on high-tension side harmonic current components and low-pressure side, the idle electricity
Flow the opposite number that offset is equal to the sum of reactive current component of on high-tension side reactive current component and low-pressure side；
Obtain the rated capacity of active filter；
According to the harmonic current compensation value, the rated capacity of the reactive-current compensation value and the active filter, determine
The operating mode of the active filter；
Electricity is generated according to the operating mode of the active filter, the harmonic current compensation value and the reactive-current compensation value
Stream compensating instruction is simultaneously sent to the active filter；
It is described that electricity is generated according to the operating mode of active filter, the harmonic current compensation value and the reactive-current compensation value
The step of flowing compensating instruction includes: the current compensation instruction are as follows: i* ca=A × i* cah+B×i* caq；i* cb=A × i* cbh+B×
i* cbq；i* cc=A × i* cch+B×i* ccq, wherein the specific value of 0≤A≤1,0≤B≤1, A and B are worked by active filter
Mode determines；
Wherein: i* cah、i* cbh、i* cchFor harmonic current compensation value；i* caq、i* cbq、i* ccqFor reactive-current compensation value；
It is described according to the harmonic current compensation value, the rated capacity of the reactive-current compensation value and the active filter,
The step of determining the operating mode of the active filter include:
Calculate harmonic wave ratio Kh and idle ratio Kq；
As the harmonic wave ratio Kh >=100%, the active filter, which works in, only mends harmonic mode, the value of A and B are as follows: A
=1, B=0；
When the 100% > Kh > first threshold of harmonic wave ratio, the active filter works in harmonic wave mode of priority, A and B
Value are as follows: 0 < B < A < 1；
It is when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq > third threshold value or described
Harmonic wave ratio Kh < second threshold and when the idle ratio Kq < 100%, the active filter works in idle preferential
The value of mode, A and B are as follows: 0 < A < B < 1；
It is described active when the harmonic wave ratio first threshold >=Kh >=second threshold and the idle ratio Kq≤third threshold value
Filter works in full compensation model, the value of A and B are as follows: A=1, B=1；
When the harmonic wave ratio Kh < second threshold and the idle ratio Kq >=100%, the active filter is worked in
Only mend idle mode, the value of A and B are as follows: A=0, B=1.
6. according to the method described in claim 5, it is characterized in that, the voltage and current for obtaining high-pressure side and low-pressure side
Step includes:
Obtain on high-tension side three-phase voltage ua1、ub1、uc1With three-phase current ia1、ib1、ic1；With
Obtain the three-phase voltage u of low pressure lateral loada2、ub2、uc2With three-phase current ia2、ib2、ic2；
Wherein, voltage signal and the equal synchronous acquisition of current signal.
7. according to the method described in claim 6, it is characterized in that, the calculating harmonic current compensation value and reactive-current compensation
The step of value includes:
According to the on high-tension side three-phase voltage and three-phase current got, the harmonic component of high-pressure side three-phase current is calculated
iah1、ibh1And ich1And the reactive component i of high-pressure side three-phase currentaq1、ibq1And icq1；And according to the low-pressure side got
The harmonic component i of low-pressure side three-phase current is calculated in three-phase voltage and three-phase currentah2、ibh2And ich2And low-pressure side three
The reactive component i of phase currentaq2、ibq2And icq2；
According to the harmonic component of high-pressure side and low-pressure side three-phase current, the harmonic current compensation value: i is obtained* cah=-iah1-
iah2、i* cbh=-ibh1-ibh2And i* cch=-ich1-ich2；According to the reactive component of high-pressure side and low-pressure side three-phase current, institute is obtained
State reactive-current compensation value: i* caq=-iaq1-iaq2、i* cbq=-ibq1-ibq2And i* ccq=-icq1-icq2。
8. the method according to the description of claim 7 is characterized in that calculating harmonic component and idle point based on Instantaneous Power Theory
Amount.
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| CN109617088B (en) * | 2018-11-27 | 2022-11-11 | 中电普瑞科技有限公司 | Reactive power and harmonic compensation method and system |
| CN110676851B (en) * | 2019-09-24 | 2020-12-04 | 北京星航机电装备有限公司 | Low-voltage modular high-power electric energy management device and compensation method thereof |
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