CN117335677A - Voltage stabilization control method for energy storage converter - Google Patents
Voltage stabilization control method for energy storage converter Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 230000006641 stabilisation Effects 0.000 title description 4
- 238000011105 stabilization Methods 0.000 title description 4
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000011217 control strategy Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a voltage stability control method of an energy storage converter, which is controlled by inductance current and capacitance voltage of an LC filter; generating a voltage reference value through voltage frequency droop control calculation, and controlling by adopting a voltage outer ring and a current inner ring, wherein the voltage ring and the current ring both adopt PI controllers; the difference between the nonlinear load sampling current and the nonlinear load rated current is fed forward to the current loop to change the reference value of the current loop. The robust droop control method for the voltage of the energy storage converter can reduce the intermediate frequency band impedance of the energy storage converter, solve the problem of serious voltage distortion when the energy storage converter is provided with a nonlinear load, realize the function of voltage stable control of the energy storage converter and effectively improve the power quality of power supply of the energy storage converter.
Description
Technical Field
The invention belongs to the field of control of power electronic converters, and relates to a voltage stability control method of an energy storage converter, which is suitable for control of the power electronic converter.
Background
At present, the energy storage converter is widely applied as a mobile power supply, and the energy storage converter has limited capacity, so that the problem of voltage distortion easily occurs to the energy storage converter under load disturbance, the voltage stability control of the energy storage converter can improve the power quality of power supply, and the normal operation of an electric load is ensured, so that the energy storage converter has important research value and significance.
The energy storage converter adopting droop control can automatically adjust output voltage according to load power, but under nonlinear load disturbance, the energy storage converter adopting droop control can have serious voltage distortion problem, and the quality of power supply of the energy storage converter is seriously affected. Nonlinear loads are common power loads, active filters are commonly adopted at present to compensate harmonic currents of the nonlinear loads, and the active filters are used for improving the power supply quality of the energy storage converter. However, some energy storage converter power supply systems are not equipped with active filters. Therefore, the voltage stability control method of the energy storage converter is provided, the problem of voltage distortion under the disturbance of the nonlinear load of the energy storage converter is solved, and the stability of output voltage is ensured.
Disclosure of Invention
The invention provides a voltage stability control method of an energy storage converter, which improves the power supply quality of the energy storage converter and solves the problem of voltage distortion of the energy storage converter under nonlinear load disturbance. The invention comprises the following steps:
step (1): collecting inductance current i of LC filter a ,i b ,i c And capacitance voltage v a ,v b ,v c Carrying out power calculation to obtain instantaneous output power P and Q of the energy storage converter, wherein the instantaneous output active power P and reactive power Q of the energy storage converter are as follows:
in the formula, v d And v q For LC filter capacitance voltage v a ,v b ,v c Values in dq coordinate system, i d And i q Inductance current i for LC filter a ,i b ,i c Values in dq coordinate system;
the amplitude and the frequency of the voltage reference value are generated through voltage frequency droop control calculation, and the amplitude V and the frequency f of the voltage reference value are as follows:
wherein f 0 For the rated frequency of the output voltage of the energy storage converter, V 0 For rated amplitude of output voltage of the energy storage converter, m is active power droop coefficient, n is reactive power droop coefficient, P 0 Rated active power of energy storage converter, Q 0 Rated reactive power of the energy storage converter;
calculating a three-phase voltage reference value V through the voltage reference value amplitude V and the voltage reference value frequency f aref ,v bref ,v cref Voltage reference v aref ,v bref ,v cref The method comprises the following steps:
wherein pi is a circumference ratio coefficient, t is a time coefficient, cos () is a cosine function;
through voltage reference v aref ,v bref ,v cref Calculating voltage reference v in dq domain dref And v qref Voltage v dref And v qref The method comprises the following steps:
wherein sin () is a sine function;
step (2): voltage v dref And v qref And voltage v d And v q Respectively, by applying a difference to the voltage difference (v dref -v d ) And (v) qref -v q ) PI calculation is carried out to obtain a control current i dv And i qv Current i dv And i qv The method comprises the following steps:
wherein G is v (s) is the transfer function, ω, of the voltage loop PI controller n Rated angular frequency of output voltage of energy storage converter, C f A filter capacitance value of the LC filter;
collecting current i on nonlinear load na ,i nb ,i nc Current i na ,i nb ,i nc Performing abc/dq conversion to obtain current i dn And i qn Current i dn And i qn The method comprises the following steps:
rated active power P by energy storage converter 0 And rated reactive power Q 0 Obtaining rated current I under dq axis dn And I qn Rated current I dn And I qn The method comprises the following steps:
capacitor voltage v through LC filter d 、v q And filter capacitor C f Calculating the d-axis filter capacitance current i cd And q-axis filter capacitance current i cq The method comprises the following steps:
where s is a differential operator, C f Is the filter capacitance of the LC filter, v d And v q Is v a ,v b ,v c Voltage in dq coordinate system;
according to the current I dn 、i dn 、i cd 、i dv Calculating to obtain d-axis current loop instruction i dref According to the current I qn 、i qn 、i cq 、i qv Calculating to obtain a q-axis current loop instruction i qref Current loop instruction i dref And i qref The method comprises the following steps:
step (3): current i dref And i qref And current i d And i q Respectively, by differencing the current differences (i dref -i d ) And (i) qref -i q ) PI calculation is performed to obtain a control voltage e d And e q Voltage e d And e q The method comprises the following steps:
wherein G is i (s) is the transfer function of the current loop PI controller, L f The filter inductance value of the LC filter;
pass voltage e d And e q Calculating an internal voltage signal e a ,e b ,e c Internal voltage signal e a ,e b ,e c The method comprises the following steps:
by an internal voltage signal e a ,e b ,e c Calculating a modulated signal s a ＝e a /(V dc /2)，s b ＝e b /(V dc /2)，s c ＝e c /(V dc /2)，V dc Is the DC side voltage of the energy storage converter, according to the modulation signal s a ,s b ,s c PWM modulation is carried out, and the on and off of a switching tube of the energy storage converter are controlled;
step (4): obtaining voltage v through a sequential impedance modeling method d ,v q Current i d ,i q The frequency domain expression of (2) is:
wherein e is a natural constant, j is an imaginary unit, ω p Is the angular frequency omega of disturbance voltage of the energy storage converter 1 Is the angular frequency delta of the fundamental voltage of the energy storage converter p1 Is the initial phase angle of the output voltage of the energy storage converter, beta 1 Is the initial phase angle alpha of the output voltage of the energy storage converter under the dq coordinate system p1 Phase angle of nonlinear load current, V p1 Is the rated amplitude of the output voltage of the energy storage converter, I p1 A nominal magnitude of the nonlinear load current;
the relation of the energy storage converter circuit can be obtained by the figure 1, which is:
wherein R is f Is the resonance damping resistance of the LC filter;
according to equations (1) - (14), the impedance of the energy storage converter under the control strategy can be obtained:
wherein Z is in (s) is an impedance analysis expression of the energy storage converter, ω n Is the angular frequency of the rated voltage of the energy storage converter.
Compared with the prior art, the method has the following advantages and effects:
(1) Under the non-linear load disturbance, the energy storage converter can actively compensate harmonic current, so that the voltage stability control method and system of the energy storage converter can stably operate, and the total harmonic quantity of the output voltage of the energy storage converter is less than 5%;
(2) Because the method does not need to use a filter to extract harmonic waves, compared with an active filter harmonic wave treatment technology, the method has small calculated amount;
(3) Compared with an energy storage converter adopting droop control, the energy storage converter adopting the droop control has smaller intermediate frequency impedance, is more similar to an ideal voltage source in the intermediate frequency, and has stronger capability of inhibiting intermediate frequency harmonic waves.
Drawings
Fig. 1 is a block diagram of a method and a system for controlling voltage stability of an energy storage converter.
Fig. 2 is a graph showing the impedance frequency characteristics of the energy storage converter under the control method and the droop control method.
Fig. 3 is an experimental waveform diagram of an energy storage converter under droop control.
Fig. 4 is an experimental waveform diagram of the energy storage converter under control.
Detailed Description
The voltage stability control method for the energy storage converter provided by the application is described in detail below with reference to the accompanying drawings:
fig. 1 is a block diagram of the energy storage converter voltage stabilization control method and system. Collecting inductance current i of LC filter a ,i b ,i c And capacitance voltage v a ,v b ,v c Carrying out power calculation to obtain instantaneous output power P and Q of the energy storage converter, wherein the instantaneous output active power P and reactive power Q of the energy storage converter are as follows:
in the formula, v d And v q For LC filter capacitance voltage v a ,v b ,v c Values in dq coordinate system, i d And i q Inductance current i for LC filter a ,i b ,i c Values in dq coordinate system;
the amplitude and the frequency of the voltage reference value are generated through voltage frequency droop control calculation, and the amplitude V and the frequency f of the voltage reference value are as follows:
wherein f 0 For the rated frequency of the output voltage of the energy storage converter, V 0 For rated amplitude of output voltage of the energy storage converter, m is active power droop coefficient, n is reactive power droop coefficient, P 0 Rated active power of energy storage converter, Q 0 Rated reactive power of the energy storage converter;
calculating a three-phase voltage reference value V through the voltage reference value amplitude V and the voltage reference value frequency f aref ,v bref ,v cref Voltage reference v aref ,v bref ,v cref The method comprises the following steps:
wherein pi is a circumference ratio coefficient, t is a time coefficient, cos () is a cosine function;
through voltage reference v aref ,v bref ,v cref Calculating voltage reference v in dq domain dref And v qref Voltage v dref And v qref The method comprises the following steps:
wherein sin () is a sine function;
voltage v dref And v qref And voltage v d And v q Respectively, by applying a difference to the voltage difference (v dref -v d ) And (v) qref -v q ) PI calculation is carried out to obtain a control current i dv And i qv Current i dv And i qv The method comprises the following steps:
wherein G is v (s) is the transfer function, ω, of the voltage loop PI controller n Rated angular frequency of output voltage of energy storage converter, C f A filter capacitance value of the LC filter;
collecting current i on nonlinear load na ,i nb ,i nc Current i na ,i nb ,i nc Performing abc/dq conversion to obtain current i dn And i qn Current i dn And i qn The method comprises the following steps:
rated active power P by energy storage converter 0 And rated reactive power Q 0 Obtaining rated current I under dq axis dn And I qn Rated current I dn And I qn The method comprises the following steps:
capacitor voltage v through LC filter d 、v q And filter capacitor C f Calculating the d-axis filter capacitance current i cd And q-axis filter capacitance current i cq The method comprises the following steps:
where s is a differential operator, C f Is the filter capacitance of the LC filter, v d And v q Is v a ,v b ,v c Voltage in dq coordinate system;
according to the current I dn 、i dn 、i cd 、i dv Calculating to obtain d-axisCurrent loop instruction i dref According to the current I qn 、i qn 、i cq 、i qv Calculating to obtain a q-axis current loop instruction i qref Current loop instruction i dref And i qref The method comprises the following steps:
current i dref And i qref And current i d And i q Respectively, by differencing the current differences (i dref -i d ) And (i) qref -i q ) PI calculation is performed to obtain a control voltage e d And e q Voltage e d And e q The method comprises the following steps:
wherein G is i (s) is the transfer function of the current loop PI controller, L f The filter inductance value of the LC filter;
pass voltage e d And e q Calculating an internal voltage signal e a ,e b ,e c Internal voltage signal e a ,e b ,e c The method comprises the following steps:
by an internal voltage signal e a ,e b ,e c Calculating a modulated signal s a ＝e a /(V dc /2)，s b ＝e b /(V dc /2)，s c ＝e c /(V dc /2)，V dc Is the DC side voltage of the energy storage converter, according to the modulation signal s a ,s b ,s c PWM modulation is carried out, and the on and off of a switching tube of the energy storage converter are controlled;
obtaining voltage v through a sequential impedance modeling method d ,v q Current i d ,i q The frequency domain expression of (2) is:
wherein e is a natural constant, j is an imaginary unit, ω p Is the angular frequency omega of disturbance voltage of the energy storage converter 1 Is the angular frequency delta of the fundamental voltage of the energy storage converter p1 Is the initial phase angle of the output voltage of the energy storage converter, beta 1 Is the initial phase angle alpha of the output voltage of the energy storage converter under the dq coordinate system p1 Phase angle of nonlinear load current, V p1 Is the rated amplitude of the output voltage of the energy storage converter, I p1 A nominal magnitude of the nonlinear load current;
the relation of the energy storage converter circuit can be obtained by the figure 1, which is:
wherein R is f Is the resonance damping resistance of the LC filter;
according to equations (1) - (14), the impedance of the energy storage converter under the control strategy can be obtained:
wherein Z is in (s) is an impedance analysis expression of the energy storage converter, ω n Is the angular frequency of the rated voltage of the energy storage converter.
Fig. 2 shows a comparison graph of impedance frequency characteristics of the energy storage converter under the control method and the droop control method, and as can be seen from fig. 2, in the harmonic frequency band, the impedance amplitude of the energy storage converter under the control method is smaller, that is, the equivalent internal resistance of the energy storage converter is smaller, the energy storage converter is more similar to an ideal voltage source, and the stability of output voltage is also stronger.
According to fig. 1, an experimental platform of a dSPACE-based energy storage converter voltage stabilization control method and system is built, experimental results are shown in fig. 3 and 4, wherein fig. 3 is an experimental waveform diagram under a droop control strategy, and fig. 4 is an experimental waveform diagram under the control strategy. As can be seen from the experimental result of fig. 3, the total voltage distortion rate of the energy storage converter under the droop control strategy is 6.38% after the nonlinear load is added, which is higher than the national standard by 5%; as can be seen from the experimental result of fig. 4, the total voltage distortion rate of the energy storage converter under the control strategy is 3.15% after the nonlinear load is added, and meets the national power quality requirement. Therefore, the method and the system for controlling the voltage stability of the energy storage converter can inhibit the harmonic voltage of the alternating current test of the energy storage converter with high quality, and improve the quality of the electric energy output by the energy storage converter.
Claims (6)
1. The voltage stability control method for the energy storage converter is characterized by improving the stability of the output voltage of the energy storage converter under load disturbance, and comprises the following steps of:
(1) Collecting inductance current i of LC filter a ,i b ,i c And capacitance voltage v a ,v b ,v c Carrying out power calculation to obtain instantaneous output power P and Q of the energy storage converter; according to instantaneous output power P and Q of the energy storage converter, calculating and generating amplitude V and frequency f of a voltage reference value through voltage frequency droop control; calculating a three-phase voltage reference value V through the voltage reference value amplitude V and the voltage reference value frequency f aref ,v bref ,v cref The method comprises the steps of carrying out a first treatment on the surface of the Through voltage reference v aref ,v bref ,v cref Obtaining a voltage reference value v through abc/dq conversion dref And v qref ；
(2) Voltage v dref And v qref And voltage v a ,v b ,v c Voltage v in dq coordinate system d And v q Respectively, by applying a difference to the voltage difference (v dref -v d ) And (v) qref -v q ) PI calculation is carried out to obtain a control current i dv And i qv The method comprises the steps of carrying out a first treatment on the surface of the Collecting current i on nonlinear load na ,i nb ,i nc Current i na ,i nb ,i nc Performing abc/dq conversion to obtain current i dn And i qn The method comprises the steps of carrying out a first treatment on the surface of the Rated active power P by energy storage converter 0 And rated reactive power Q 0 Calculating to obtain rated current I under dq axis dn And I qn The method comprises the steps of carrying out a first treatment on the surface of the By filtering the capacitor voltage v d 、v q And filter capacitor C f Calculating the filter capacitance current i under dq coordinate system cd And i cq The method comprises the steps of carrying out a first treatment on the surface of the According to the current I dn 、i dn 、i cd And i dv Calculating to obtain d-axis current loop instruction i dref According to the current I qn 、i qn 、i cq And i qv Calculating to obtain a q-axis current loop instruction i qref ；
(3) Current i dref And i qref And current i a ,i b ,i c Current i in dq coordinate system d And i q Respectively, by differencing the current differences (i dref -i d ) And (i) qref -i q ) PI calculation is performed to obtain a control voltage e d And e q The method comprises the steps of carrying out a first treatment on the surface of the Pass voltage e d And e q Calculating an internal voltage signal e a ,e b ,e c The method comprises the steps of carrying out a first treatment on the surface of the By an internal voltage signal e a ,e b ,e c Calculating a modulated signal s a ＝e a /(V dc /2)，s b ＝e b /(V dc /2)，s c ＝e c /(V dc /2)，V dc Is the DC side voltage of the energy storage converter, according to the modulation signal s a ,s b ,s c PWM modulation is carried out, and the on and off of a switching tube of the energy storage converter are controlled; the stability of the output voltage of the energy storage converter can be improved;
(4) Obtaining voltage v through a sequential impedance modeling method d ,v q Current i d ,i q Is a frequency domain expression of (2); according to the relation of the energy storage converter circuit and the voltage v d ,v q Current i d ,i q The impedance Z of the energy storage converter under the control strategy can be obtained by the frequency domain expression of (2) in (s)。
2. The method of claim 1, wherein in step (1), the three-phase voltage reference v is aref ,v bref ,v cref The method comprises the following steps:
wherein V is the reference voltage amplitude generated by droop control calculation, pi is the circumference ratio coefficient, t is the time coefficient, and cos () is the cosine function.
3. The method for stabilizing and controlling voltage of energy storage converter according to claim 1, wherein the d-axis rated current I in step (2) dn And q-axis rated current I qn The method comprises the following steps:
wherein V is 0 To output voltage amplitude, P 0 And Q 0 The rated active power and the rated reactive power of the energy storage converter are respectively.
4. The method of claim 1, wherein the d-axis filter capacitor current i in step (2) cd And q-axis filter capacitance current i cq The method comprises the following steps:
where s is a differential operator, C f Is the filter capacitance of the LC filter, v d And v q Is v a ,v b ,v c Voltage in dq coordinate system.
5. The method of claim 1, wherein the current loop command value i in step (2) dref And i qref The method comprises the following steps:
wherein i is dv And i qv For the voltage outer loop output value, i dn And i qn I is the nonlinear load current in dq coordinate system dv And i qv For the control current obtained for the voltage outer loop.
6. The method of claim 1, wherein the impedance analysis value of the energy storage converter in the step (4) is:
wherein Z is in (s) is an impedance analysis expression of the energy storage converter, j is an imaginary unit, omega p Is the angular frequency omega of disturbance voltage of the energy storage converter n For the rated angular frequency of the output voltage of the energy storage converter, L f Is the filtering inductance value of the LC filter, C f Is the filter capacitance value of the LC filter, R f Is the resonance damping resistance of the LC filter, G i (s) is the transfer function of the current loop PI controller, G v (s) is the transfer function of the voltage loop PI controller.
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| CN118050631A (en) * | 2024-04-16 | 2024-05-17 | 三峡金沙江川云水电开发有限公司 | Output stability control method of light 30kA current generating device |
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| CN118050631A (en) * | 2024-04-16 | 2024-05-17 | 三峡金沙江川云水电开发有限公司 | Output stability control method of light 30kA current generating device |
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