CN105610145B - Power feedback active full-harmonic arc extinction control method and system - Google Patents
Power feedback active full-harmonic arc extinction control method and system Download PDFInfo
- Publication number
- CN105610145B CN105610145B CN201511032262.7A CN201511032262A CN105610145B CN 105610145 B CN105610145 B CN 105610145B CN 201511032262 A CN201511032262 A CN 201511032262A CN 105610145 B CN105610145 B CN 105610145B
- Authority
- CN
- China
- Prior art keywords
- current
- value
- voltage
- harmonic
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008033 biological extinction Effects 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 41
- 238000003672 processing method Methods 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 52
- 230000001629 suppression Effects 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to the technical field of control methods of arc extinction equipment, and particularly provides a control method and a system for active full-harmonic compensation arc extinction with feedback power, wherein the method comprises the following steps: 1) a voltage processing method of a three-phase power grid; 2) a method for processing the direct-current voltage; 3) a method of compensating for ground fault current; the system comprises a control module, and a grid-connected voltage sampling module, a grid-connected current sampling module, a direct-current voltage sampling module, a power grid side power compensation module and a fault current sampling module which are connected with the control module. Compared with the prior art, the invention can realize the rapid detection of the fundamental wave reactive power, the harmonic active power and the fundamental wave active current, fully compensate the fundamental wave reactive power, the harmonic reactive power and the harmonic active power, and simultaneously feed back the active power to the side of the power grid, thereby improving the compensation speed and precision during the earth fault to a great extent and greatly improving the operation safety of the power system.
Description
Technical Field
The invention relates to a control method of arc extinction equipment, in particular to an active full-harmonic arc extinction control method with feedback power and a system thereof.
Background
With the acceleration of urbanization, in recent years, the power distribution network generally develops towards a large-capacity and multi-line direction. The widespread use of urban cable networks has further exacerbated this capacity expansion trend. Meanwhile, the continuously advancing society also puts higher and higher requirements on power supply reliability, and the power supply reliability becomes an important standard for measuring the success of power supply enterprises. Under the large background, the power distribution network mainly adopts a mode that a neutral point is grounded through an arc suppression coil. A conventional neutral point resonance-grounded power grid is shown in fig. 1, and when a ground fault occurs, capacitive current IC due to distributed capacitance of a cable is removed from a power system0In addition, the harmonic current I also contains a large componenthAnd active current, wherein the active current component is mainly caused by leakage current of the power equipment, active loss in a zero sequence loop, corona loss, active loss of an arc suppression coil and the like. An important source of higher harmonics is the nonlinear loads containing iron cores and rectifying elements in the power system. The arc suppression coil is usually adopted and is a passive power frequency reactive current compensation device, as the name suggests, namely, the arc suppression coil only compensates the power frequency reactive capacitance current component in the grounding fault current, and only outputs the inductive current for the resistive current and the high-frequency current has no function, which is one of the existing arc suppression coils in principleIt is not enough. With the continuous development of industrialization, the power distribution network is continuously enlarged, the pollution caused by the factors is increasingly aggravated when power electronic transformation equipment, particularly new energy grid-connected equipment is increased, the traditional arc extinction device has no compensation capability for the part of current, so that the compensation failure is easily caused, the electric arc is reignited, and safety accidents such as tripping or fire are caused. As can be seen from the above analysis, the damage caused by the active component and harmonic component in the current is not negligible when the ground fault occurs. In order to eliminate the residual current, realize true full compensation and improve the power supply reliability of the power grid, the full compensation technology of the ground fault current is required to be adopted to compensate the residual current including active current and harmonic current. The full compensation requirement for the grounding current compensates the active component, the reactive component and the harmonic component together, and obviously the requirement cannot be met only by relying on the arc suppression coil. The active inversion technology is a power electronic technology widely applied to the fields of harmonic suppression, reactive power compensation, alternating current and direct current hybrid power transmission, new energy grid connection and the like. The active inverter is characterized in that a control command can be generated by detecting the state of a working system, and a compensation waveform is generated by controlling an electronic switch. The method overcomes the defect that the passive compensation technology can only compensate the waveform with fixed frequency and amplitude, and can track and compensate the waveform with variable frequency and amplitude. Because the self-state tracking, detecting and controlling algorithm is provided, the reactive power and harmonic components can be compensated at will according to requirements, and the re-grid connection of active power can be realized, thereby truly realizing full compensation. To realize full harmonic compensation and grid feedback of active power, a grid connection strategy suitable for a fault grid and a current generation mechanism with high speed and accuracy are required.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power feedback active full-harmonic arc extinction control method and a power feedback active full-harmonic arc extinction control system, so as to solve the technical problems that all harmonic currents in a ground fault cannot be quickly and completely eliminated and the active power current cannot be fed back by a power grid in the conventional power grid fault ground arc extinction technology.
The invention is realized by the following technical scheme:
the invention provides a power feedback control method for active full-harmonic compensation arc extinction, which comprises the following steps of:
step S1: voltage processing method of three-phase power grid
Step S101: line voltage U of three-phase power gridAB、UBCClark conversion is carried out firstly, and then phase angles of three-phase power grid line voltages AB are obtainedCarrying out Park + and Park-conversion of positive and negative sequences to obtain direct-current voltage components under a positive sequence coordinate system
And DC voltage component under negative sequence coordinate system
Step S102: will be provided with
And
respectively carrying out voltage positive and negative sequence decoupling filtering processing to obtain voltage decoupling value
Step S103: will be provided with
Performing feedforward processing to obtain fundamental voltage value V of space vector pulse width modulation SV _ PWMg_FF_d1、Vg_FF_q1；
Step S2: method for processing direct current voltage
Step S201: will actually be the DC voltage UDCAnd the set ideal DC voltage
Subtracting and performing proportional integral to obtain positive sequence fundamental wave active current given value
Step S202: input current I of three-phase power gridSA、ISB、ISCClark transformation is firstly carried out, and then the phase of the three-phase power grid phase voltage A is determinedCarrying out Park + and Park-conversion of positive and negative sequences to obtain direct current components under a positive sequence coordinate system
And DC current component in negative sequence coordinate system
Step S203: will be provided with
Andrespectively carrying out current positive and negative sequence decoupling filtering processing to obtain a current decoupling value
Will be provided with
And
subtracting and performing proportional integral to obtain q-axis regulating voltage
Step S204: will be provided with
And VgOutputting the _ FF _ q1 to an SV _ PWM module to generate a rectified pulse signal;
step S3: method for compensating earth fault current
Step S301: will compensate the current IZMinus the fault current I0Obtaining an error value I of the compensation currentg；
Step S302: using band-pass filter pair IgBPF1-BPF50 harmonic calculation is respectively carried out to obtain harmonic current values I of each orderEn；
Step S303: according to the respective order IEnAnd its corresponding lead angle thetanCalculating the leading current value IEn_θnEach time IEn_θnMultiplying the system impedance Z under the harmonic frequency of the corresponding order to obtain a reference voltage value V under each harmonicEn(ii) a Wherein the lead angle θnFor each harmonic current lag voltage angle, lead angle thetanThe system impedance Z and the system impedance Z are both intrinsic parameters of system hardware;
step S304: reference voltage value V of each timeEnAdding to obtain total compensation voltage VEWill VEAnd outputting the signal to an H-bridge pulse width modulation (H _ PWM) module to generate an inversion pulse signal.
In the step S102, the step
And
the specific calculation method for respectively carrying out positive and negative sequence decoupling filtering processing comprises the following steps:
in the formula (I), the compound is shown in the specification,
the angle of the fundamental negative sequence rotating to the fundamental positive sequence,
is composed of
Is detected by the filter value of (a),is composed of
Is detected by the filter value of (a),is composed of
Is detected by the filter value of (a),
is composed of
The filtered value of (a); each filtering value is obtained by a simple low-pass filter, and the specific calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value of the one or more of,for the last calculation cycle
The value of the one or more of,
for the calculation period of the bookThe value of the one or more of,for the last calculation cycle
The value of the one or more of,for the calculation period of the book
The value of the one or more of,for the last calculation cycleThe value of the one or more of,for the calculation period of the book
The value is obtained.
In step S103, a specific calculation method of the feedforward processing is as follows:
in the formula, Kfeed_forwordIn order to be a feed-forward coefficient,the angle of the fundamental negative sequence rotating to the fundamental positive sequence,
for the corrected angle of the negative sequence of the fundamental wave rotating to the positive sequence of the fundamental wave, the initial value is
θCMPIs the amount of angular correction due to sampling and calculating delay.
In step S203, the calculation method of the current positive and negative sequence decoupling process specifically includes:
in the formula (I), the compound is shown in the specification,the angle of the fundamental negative sequence rotating to the fundamental positive sequence.
In the step S302, a second-order Butterworth band-pass filter pair I is utilizedgCarrying out harmonic operation, wherein the specific formula is as follows:
IEn＝a0*IEn_x_k+a1*IEn_x_(k-1)+a2*IEn_x_(k-2)+b1*IEn_y_(k-1)+b2*IEn_y_(k-2)
in the formula, a0、a1、a2、b1、b2Is a filter coefficient, IEn_xK is the actual sample value of the calculation cycle, IEn_x(k-1) is the actual sampled value of the previous calculation cycle, IEn_x(k-2) is the actual sample value of the previous 2 calculation cycles; i isEn_y(k-1) is the filtered value of the previous calculation cycle, IEn_yAnd (k-2) is the filtered value for the first 2 calculation cycles. I isEnThe initial value is zero.
The invention also provides an active full-harmonic arc extinction system with power feedback, which comprises a control module, and a grid-connected voltage sampling module, a grid-connected current sampling module, a direct-current voltage sampling module, a power grid side power compensation module and a fault current sampling module which are connected with the control module, wherein:
the power grid side power compensation module comprises a rectifier bridge circuit and an inverter bridge circuit which are sequentially connected, wherein the input end of the rectifier bridge circuit is connected to the three-phase power grid through a reactance, and the output end of the inverter bridge circuit is connected with an arc suppression coil of the three-phase power grid in series through a compensation transformer;
the grid-connected voltage sampling module is used for collecting line voltage U of a three-phase power gridABAnd UBC；
The grid-connected current sampling module is used for collecting input current I of a three-phase power gridSA、ISB、ISC；
The direct-current voltage sampling module is used for collecting actual voltageDC voltage UDC；
The fault current sampling module is used for collecting the fault current I of the three-phase power grid0And a compensation current IZ；
The rectification pulse output end of the control module is connected with the rectification bridge circuit, the inversion pulse output end of the control module is connected with the inversion bridge circuit, and the control module is used for collecting line voltage UABAnd UBCInput current ISA、ISB、ISCTrue DC voltage UDCFault current I0And a compensation current IZGenerating a rectified pulse signal and an inverted pulse signal.
Compared with the prior art, the invention has the following advantages: the invention provides a power feedback active full-harmonic arc extinction control method and a system thereof, the method can realize the rapid detection of fundamental wave reactive power, harmonic active power and fundamental wave active current, fully compensate the fundamental wave reactive power, the harmonic reactive power and the active power, and simultaneously feed back part of the active power to the side of a power grid, thereby improving the compensation speed and precision during ground fault to a great extent and greatly improving the operation safety of a power system.
Drawings
FIG. 1 is a schematic circuit diagram of an active full harmonic compensation arc suppression system with power feedback;
fig. 2 is a system configuration block diagram of a control method of power feedback active full harmonic compensation arc extinction.
FIG. 3- (1) faulted phase voltage;
FIG. 3- (2) non-faulted phase voltage;
FIG. 3- (3) full compensation current;
FIG. 3- (4) harmonic compensation current;
FIG. 3- (5) fundamental active power;
FIG. 3- (6) fundamental reactive power;
FIG. 4- (1) Pre-Compensation fault Current;
FIG. 4- (2) residual current after compensation.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The invention also provides a power feedback active full-harmonic arc extinction system which has a structure shown in figure 1 and comprises a control module, a grid-connected voltage sampling module, a grid-connected current sampling module, a direct current voltage sampling module, a power grid side power compensation module and a fault current sampling module, wherein the grid-connected voltage sampling module, the grid-connected current sampling module, the direct current voltage sampling module, the power grid side power compensation module and the fault current sampling module are connected with the control module, and the power feedback active:
the power compensation module at the power grid side comprises a rectifier bridge circuit and an inverter bridge circuit which are sequentially connected, the input end of the rectifier bridge circuit is connected to a three-phase power grid through a reactance group L2, and the output end of the inverter bridge circuit is connected in series with an arc suppression coil of the three-phase power grid through a compensation transformer T1;
the grid-connected voltage sampling module comprises two groups of grid-connected voltage sampling sensors PT2 and PT3 and is used for collecting line voltage U of a three-phase power gridABAnd UBC；
The grid-connected current sampling module comprises three groups of grid-connected current sampling sensors CT2, CT3 and CT4 and is used for collecting input current I of a three-phase power gridSA、ISB、ISC；
The direct-current voltage sampling module comprises a direct-current voltage sampling sensor PT1, and a signal acquisition end of the direct-current voltage sampling sensor PT1 is connected to a signal output end of the rectifier bridge circuit and used for acquiring actual direct-current voltage UDC；
The fault current sampling module comprises fault current sampling sensors CT1 and CT5, wherein a signal acquisition end of the fault current sampling sensor CT1 is connected to an arc suppression coil L1 of the three-phase power grid and is used for acquiring fault current I of the three-phase power grid0The signal acquisition end of the fault current sampling sensor CT5 is connected to the signal output end of the inverter bridge circuit and is used for acquiring a compensation current IZ；
The rectification pulse output end of the control module is connected with the rectifier bridge circuit, and the inversion pulse output end of the control module is connected with the rectifier bridge circuitThe end is connected with an inverter bridge circuit, and the control module is used for collecting line voltage UABAnd UBCInput current ISA、ISB、ISCTrue DC voltage UDCFault current I0And a compensation current IZGenerating a rectified pulse signal and an inverted pulse signal.
The active full-harmonic compensation arc extinction system with the power feedback function can realize rapid detection of fundamental wave reactive power, harmonic active power and fundamental wave active current, complete compensation of the fundamental wave reactive power, the harmonic reactive power and the harmonic active power and partial feedback of the active power to the power grid side, and the specific control method comprises the following steps:
step S1: voltage processing method of three-phase power grid
Step S101: line voltage U of three-phase power gridAB、UBCClark conversion is carried out firstly, and then phase angles of three-phase power grid line voltages AB are obtained
Carrying out Park + and Park-conversion of positive and negative sequences to obtain direct-current voltage components under a positive sequence coordinate system
And DC voltage component under negative sequence coordinate system
Step S102: will be provided with
Andinputting the voltage to a D _ Couple module for voltage positive and negative sequence decoupling filtering processing to obtain a voltage decoupling value
The specific calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
the angle of the fundamental negative sequence rotating to the fundamental positive sequence,
is composed ofIs detected by the filter value of (a),
is composed ofIs detected by the filter value of (a),
is composed ofIs detected by the filter value of (a),
is composed of
The filtered value of (a); each filtering value is obtained by a simple low-pass filter, and the specific calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value of the one or more of,
for the last calculation cycle
The value of the one or more of,
for the calculation period of the bookThe value of the one or more of,for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value of the one or more of,
for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
A value;
step S103: will be provided with
Inputting the voltage into a Feed forward module for Feed forward processing to obtain a fundamental voltage value V of SV _ PWMg_FF_d1、VgThe specific calculation method of _ FF _ q1 is as follows:
in the formula, Kfeed_forwordIn order to be a feed-forward coefficient,
for the corrected angle of the negative sequence of the fundamental wave rotating to the positive sequence of the fundamental wave, the initial value is
θCMPThe amount of angular correction due to sampling and calculating delay is about 2 °.
Step S2: method for processing direct current voltage
Step S201: will actually be the DC voltage UDCAnd the set ideal DC voltage
Subtracting and performing proportional integral to obtain positive sequence fundamental wave active current given value
Step S202: input current I of three-phase power gridSA、ISB、ISCClark transformation is firstly carried out, and then the phase of the three-phase power grid phase voltage A is determinedCarrying out Park + and Park-conversion of positive and negative sequences to obtain direct current components under a positive sequence coordinate system
And DC current component in negative sequence coordinate system
Step S203: will be provided with
And
inputting the current to a D _ Comple module for current positive and negative sequence decoupling filtering processing to obtain a current decoupling valueThe specific calculation method comprises the following steps:
then, willAndsubtracting and performing proportional integral to obtain q-axis regulating voltage
Step S204: will be provided with
And VgOutputting the _ FF _ q1 to an SV _ PWM module to generate a rectified pulse signal;
step S3: method for compensating earth fault current
Step S301: will compensate the current IZMinus the fault current I0Obtaining an error value I of the compensation currentg；
Step S302: using a second order Butterworth bandpass filter pair IgBPF1-BPF50 subharmonic calculation is respectively carried out, and the specific formula is as follows:
IEn＝a0*IEn_x_k+a1*IEn_x_(k-1)+a2*IEn_x_(k-2)+b1*IEn_y_(k-1)+b2*IEn_y_(k-2)
in the formula: a is0、a1、a2、b1、b2Is a filter coefficient, IEn_xK is the actual sample value of the calculation cycle, IEn_x(k-1) is the actual sampled value of the previous calculation cycle, IEn_x(k-2) is the actual sample value of the previous 2 calculation cycles; i isEn_y(k-1) is the filtered value of the previous calculation cycle, IEn_yAnd (k-2) is the filtered value for the first 2 calculation cycles. I isEnThe initial value is zero;
step S303: according to the respective order IEnAnd its corresponding lead angle thetanCalculating the leading current value IEn_θnEach one isSub IEn_θnMultiplying the system impedance Z under the harmonic frequency of the corresponding order to obtain a reference voltage value V under each harmonicEn(ii) a Wherein the lead angle θnFor each harmonic current lag voltage angle, lead angle thetanThe system impedance Z and the system impedance Z are both intrinsic parameters of system hardware;
step S304: reference voltage value V of each timeEnAdding to obtain total compensation voltage VEWill VEAnd outputting the signal to an H _ PWM module to generate an inversion pulse signal.
The active full-harmonic arc extinction system with the feedback power shown in fig. 1 is taken as an experimental object, the system voltage is 10kV, the single-phase ground capacitance is 25uF, and the damping rate is 10%, assuming that a single-phase ground fault occurs at time t1, fig. 3- (1) a fault phase voltage, fig. 3- (2) a non-fault phase voltage, and fig. 3- (3) a full compensation current, and after the full compensation current is decomposed, the harmonic compensation current shown in fig. 3- (4) can be obtained, and fig. 3- (5) fundamental active power and fig. 3- (6) fundamental reactive power; and as can be seen from comparison between the fault current before compensation in fig. 4- (1) and the residual current after compensation in fig. 4- (2), the compensation method can compensate most of the fault current, so that arc is rapidly extinguished, and the system safety is guaranteed.
Claims (4)
1. The utility model provides a power repayment active full harmonic compensation arc extinction control method, wherein power repayment active full harmonic arc extinction system, including control module, and grid-connected voltage sampling module, grid-connected current sampling module, direct current voltage sampling module, electric wire netting side power compensation module and fault current sampling module connected with it, wherein:
the power grid side power compensation module comprises a rectifier bridge circuit and an inverter bridge circuit which are sequentially connected, wherein the input end of the rectifier bridge circuit is connected to the three-phase power grid through a reactance, and the output end of the inverter bridge circuit is connected with an arc suppression coil of the three-phase power grid in series through a compensation transformer;
the grid-connected voltage sampling module is used for collecting line voltage U of a three-phase power gridABAnd UBC；
The grid-connected current sampling module is used for collecting input electricity of a three-phase power gridStream ISA、ISB、ISC；
The direct current voltage sampling module is used for collecting actual direct current voltage UDC；
The fault current sampling module is used for collecting the fault current I of the three-phase power grid0And a compensation current IZ；
The rectification pulse output end of the control module is connected with the rectification bridge circuit, the inversion pulse output end of the control module is connected with the inversion bridge circuit, and the control module is used for collecting line voltage UABAnd UBCInput current ISA、ISB、ISCTrue DC voltage UDCFault current I0And a compensation current IZGenerating a rectified pulse signal and an inverted pulse signal, wherein the control method comprises the steps of:
step S1: voltage processing method of three-phase power grid
Step S101: line voltage U of three-phase power gridAB、UBCClark conversion is carried out firstly, and then phase angles of three-phase power grid line voltages AB are obtained
Carrying out Park + and Park-conversion of positive and negative sequences to obtain direct-current voltage components under a positive sequence coordinate system
And DC voltage component under negative sequence coordinate system
Step S102: will be provided with
And
respectively carrying out voltage positive and negative sequence decoupling filtering processing to obtain voltage decoupling value
Step S103: will be provided with
Performing feedforward processing to obtain fundamental voltage value V of space vector pulse width modulation SV _ PWMg_FF_d1、Vg_FF_q1；
Step S2: method for processing direct current voltage
Step S201: will actually be the DC voltage UDCAnd the set ideal DC voltage
Subtracting and performing proportional integral to obtain positive sequence fundamental wave active current given value
Step S202: input current I of three-phase power gridSA、ISB、ISCClark transformation is firstly carried out, and then the phase of the three-phase power grid phase voltage A is determined
Carrying out Park + and Park-conversion of positive and negative sequences to obtain direct current components under a positive sequence coordinate system
And DC current component in negative sequence coordinate system
Step S203: will be provided with
And
respectively carrying out current positive and negative sequence decoupling filtering processing to obtain a current decoupling value
Will be provided with
And
subtracting and performing proportional integral to obtain q-axis regulating voltage
Step S204: will be provided with
And VgOutputting the _ FF _ q1 to an SV _ PWM module to generate a rectified pulse signal;
step S3: method for compensating earth fault current
Step S301: will compensate the current IZMinus the fault current I0Obtaining an error value I of the compensation currentg；
Step S302: using band-pass filter pair IgBPF1-BPF50 harmonic calculation is respectively carried out to obtain harmonic current values I of each orderEn；
Step S303: according to the respective order IEnAnd its corresponding lead angle thetanCalculating the leading current value IEn_θnEach time IEn_θnMultiplying the system impedance Z under the harmonic frequency of the corresponding order to obtain a reference voltage value V under each harmonicEn(ii) a Wherein the lead angle θnFor each harmonic current lag voltage angle, lead angle thetanThe system impedance Z and the system impedance Z are both intrinsic parameters of system hardware;
step S304: reference voltage value V of each timeEnAdding to obtain total compensation voltage VEWill VEOutput to H bridge pulse width modulation H _ PWM module to generate inverted pulse signal。
2. The method as claimed in claim 1, wherein in step S102, the step of controlling the reactive power full harmonic compensation arc extinction is performed
And
the specific calculation method for respectively carrying out positive and negative sequence decoupling filtering processing comprises the following steps:
in the formula (I), the compound is shown in the specification,
the angle of the fundamental negative sequence rotating to the fundamental positive sequence,
is composed of
Is detected by the filter value of (a),
is composed of
Is detected by the filter value of (a),
is composed ofIs detected by the filter value of (a),
is composed of
The filtered value of (a); each filtering value is obtained by a simple low-pass filter, and the specific calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value of the one or more of,for the last calculation cycle
The value of the one or more of,for the calculation period of the bookThe value of the one or more of,for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value of the one or more of,for the last calculation cycle
The value of the one or more of,
for the calculation period of the book
The value is obtained.
3. The method as claimed in claim 1, wherein the step S203 of calculating the decoupling process of positive and negative current sequences includes:
in the formula (I), the compound is shown in the specification,
the angle of the fundamental negative sequence rotating to the fundamental positive sequence.
4. The method as claimed in claim 1, wherein in step S302, a second-order Butterworth band-pass filter is used to couple I to the first-order Butterworth band-pass filtergCarrying out harmonic operation, wherein the specific formula is as follows:
IEn＝a0*IEn_x_k+a1*IEn_x_(k-1)+a2*IEn_x_(k-2)+b1*IEn_y_(k-1)+b2*IEn_y_(k-2)
in the formula, a0、a1、a2、b1、b2Is a filter coefficient, IEn_xK is the actual sample value of the calculation cycle, IEn_x(k-1) is the actual sampled value of the previous calculation cycle, IEn_x(k-2) is the actual sample value of the previous 2 calculation cycles; i isEn_y(k-1) is the filtered value of the previous calculation cycle, IEn_y(k-2) is the filtered value of the first 2 calculation cycles, IEnThe initial value is zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511032262.7A CN105610145B (en) | 2015-12-31 | 2015-12-31 | Power feedback active full-harmonic arc extinction control method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511032262.7A CN105610145B (en) | 2015-12-31 | 2015-12-31 | Power feedback active full-harmonic arc extinction control method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105610145A CN105610145A (en) | 2016-05-25 |
| CN105610145B true CN105610145B (en) | 2020-01-07 |
Family
ID=55989777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511032262.7A Active CN105610145B (en) | 2015-12-31 | 2015-12-31 | Power feedback active full-harmonic arc extinction control method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105610145B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347046B (en) * | 2017-01-24 | 2019-08-06 | 中国石油化工股份有限公司 | A kind of small current grounding fault New Method of Active Electronic Compensation and system |
| CN109709390B (en) * | 2018-12-19 | 2021-10-01 | 深圳市中电电力技术股份有限公司 | Three-phase high-precision harmonic electric energy meter |
| CN111181145A (en) * | 2020-02-26 | 2020-05-19 | 安徽一天电气技术股份有限公司 | Arc suppression system and method |
| CN114142451B (en) * | 2021-11-19 | 2022-09-23 | 广东福德电子有限公司 | Power distribution network ground fault voltage reduction active arc suppression power supply and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715695A (en) * | 2013-12-24 | 2014-04-09 | 国家电网公司 | Intelligent power distribution network neutral point grounding active full-compensation control system |
| CN204905858U (en) * | 2015-08-03 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Flexible control ground connection arc extinction device of distribution network zero -sequence voltage |
-
2015
- 2015-12-31 CN CN201511032262.7A patent/CN105610145B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715695A (en) * | 2013-12-24 | 2014-04-09 | 国家电网公司 | Intelligent power distribution network neutral point grounding active full-compensation control system |
| CN204905858U (en) * | 2015-08-03 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Flexible control ground connection arc extinction device of distribution network zero -sequence voltage |
Non-Patent Citations (1)
| Title |
|---|
| 配电网三相不平衡过电压有源抑制方法研究;曾祥君等;《电工技术学报》;20150531;第30卷(第9期);第61-69页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105610145A (en) | 2016-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104953606B (en) | Networked layered compensation method for voltage unbalance of PCC (Point of Common Coupling) of islanded microgrid | |
| CN105610145B (en) | Power feedback active full-harmonic arc extinction control method and system | |
| CN102664545B (en) | Restraining method of inverter voltage feed-forward direct-current components and control method for inverter | |
| CN106532749B (en) | A kind of micro-capacitance sensor imbalance power and harmonic voltage compensation system and its application | |
| CN110231793B (en) | Full-power test control method for direct-current ice melting device | |
| CN110429603B (en) | Six-switch seven-level active power filter and compensation method | |
| CN202888833U (en) | Power quality control system merged with active electric power filter and reactive compensation device | |
| CN113839388A (en) | Current double-loop control method of active power filter based on hybrid load | |
| CN105244882A (en) | Compensation method of three-phase three-wire system active power filter for power grid harmonic current | |
| CN101963787B (en) | Dual feedback loop control method of power active filter | |
| CN106208063A (en) | The Auto-disturbance-rejection Control of a kind of Active Power Filter-APF and Active Power Filter-APF | |
| CN103457267B (en) | Space vector pulse width modulation control method of three-phase parallel active electric filter | |
| Memon et al. | Design of three-phase hybrid active power filter for compensating the harmonic currents of three-phase system | |
| CN106253276B (en) | A kind of three-phase tri-level active filter control method of fusion disturbance rejection technology | |
| CN104993487A (en) | SAPF control method for voltage source type non-linear load harmonic compensation | |
| Huang et al. | The study of Active Power Filter using a universal harmonic detection method | |
| Xiu et al. | Voltage sag detection method based on dq transform and complex wavelet transform | |
| CN109149579B (en) | Control method for HAPF harmonic compensation and resonance suppression based on network side current sampling | |
| Das et al. | Power quality improvement of three phase system using shunt active power filter | |
| CN103094916A (en) | Three-phase three-wire system interphase balance method based on electric power active power filter | |
| Kumar et al. | Comparative performance analysis of single-phase grid-connected converters | |
| CN108899906B (en) | Built-in repetitive dead beat control method for three-phase four-wire APF | |
| Priyashree et al. | Harmonic suppression in a non-linear load using three phase shunt active power filter | |
| CN106253284A (en) | A kind of active filter based on port voltage detection and control method | |
| Xiuhe et al. | Harmonic current detection of electric arc furnace system based on the method of eliminating zero-sequence component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220424 Address after: No.99, Yonghe Road, high tech Zone, Hefei City, Anhui Province, 230088 Patentee after: ANHUI ONESKY ELECTRICAL TECHNOLOGY CO.,LTD. Address before: 230088 no.97-1, Yonghe Road, high tech Zone, Hefei City, Anhui Province Patentee before: ANHUI ONESKY POWER QUALITY TECH. Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231120 Address after: No. 97-1, Yonghe Road, High tech Zone, Hefei, Anhui 230000 Patentee after: ANHUI XINLI ELECTRICAL EQUIPMENT Co.,Ltd. Address before: No.99, Yonghe Road, high tech Zone, Hefei City, Anhui Province, 230088 Patentee before: ANHUI ONESKY ELECTRICAL TECHNOLOGY CO.,LTD. |