CN114070028A - Voltage-sharing control method of cascade bidirectional converter device - Google Patents
Voltage-sharing control method of cascade bidirectional converter device Download PDFInfo
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 230000003044 adaptive effect Effects 0.000 claims description 29
- 210000001061 forehead Anatomy 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 3
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- 238000005457 optimization Methods 0.000 abstract 1
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- 238000011217 control strategy Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The voltage-sharing control method of the cascade type bidirectional converter device comprises the following steps of firstly, making a difference between the voltage at the direct current side of each bidirectional converter unit and the average value of the voltages at the direct current sides of all the bidirectional converter units, and solving the deviation amount of the voltage at the direct current side; and then setting different functions for solving the self-adaptive current instruction regulating coefficient for the rectification and inversion working modes, and finally multiplying the current instruction regulating coefficient by the current instruction of closed-loop control to realize the control of the unit work of the bidirectional converter. The voltage-sharing control method of the cascade bidirectional converter device can ensure that the cascade bidirectional converter device is not biased when operating at different power sections, can adapt to topological structures with different cascade numbers and different parallel numbers of bidirectional converter modules in each stage, plays a key role in the safety and stability operation of a system, optimization and upgrade and the adaptability of device topological structure change, and greatly improves the flexibility of product development.
Description
Technical Field
The invention relates to a voltage-sharing control method, in particular to a voltage-sharing control method of a cascade bidirectional converter device.
Background
The voltage-sharing control of the existing cascade type converter generally adopts a mode of fixedly adjusting the current instruction size, and the mode has the biggest advantage of simple control, but certain disadvantages exist in the fixed adjusting coefficient. Firstly, the operation condition of the equipment cannot be completely adapted: when the equipment runs in different rectifying or inverting working modes, the required regulating quantity is different even if the voltage deviation quantity is the same; when the equipment works in a low current working condition, an excessive regulating coefficient can have the problem of excessive compensation so as to cause bias voltage. Secondly, the topological structure of different parallel numbers of each stage cannot be completely adapted, when a plurality of modules are connected in parallel in each stage, the sensitivity of the power of each stage to a current instruction is increased, and when the equipment runs in different power sections, the fixed regulating coefficient may have the problem of over-compensation or under-compensation.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a voltage-sharing control method of a cascade type bidirectional converter device.
The invention relates to a voltage-sharing control method of a cascade type bidirectional converter device, wherein the cascade type bidirectional converter device is formed by connecting m bidirectional converter units in series, each bidirectional converter unit is formed by connecting n power units in parallel, and the power units can selectively work in a rectification mode or an inversion mode; one end of the cascade type bidirectional converter device is connected to a direct current traction power grid, and the other end of the cascade type bidirectional converter device is connected to an alternating current power grid through a transformer; when the power unit works in a rectification mode, electric energy on the alternating current power grid is input into the direct current traction power grid, and when the power unit works in an inversion mode, the electric energy on the direct current traction power grid is input into the alternating current power grid; the voltage-sharing control method of the cascade bidirectional converter device is characterized by comprising the following steps: firstly, the voltage of the direct current side of each bidirectional converter unit is differed from the average value of the voltages of the direct current sides of all the bidirectional converter units, and the deviation value of the voltage of the direct current side of each bidirectional converter unit is calculated; and finally, multiplying the current instruction regulating coefficient by a current instruction of closed-loop control to realize the control of the working state of the bidirectional converter units so as to realize the power balance and the direct current side voltage balance of the m bidirectional converter units.
The invention relates to a voltage-sharing control method of a cascade type bidirectional converter device, which is realized by the following steps:
a) acquiring direct-current side voltage, acquiring direct-current side voltage of each bidirectional converter unit, and recording the direct-current side voltage of m bidirectional converter units as U respectively1、U2、…、Um；
b) Calculating the deviation amount of the DC-side voltage, taking the average value of the DC-side voltages of the m bidirectional converter units as a voltage target value, taking the difference value of the DC-side voltage and the voltage target value of each bidirectional converter unit as the real-time deviation amount of the DC-side voltage, and calculating the real-time deviation amount delta U of the DC-side voltage of each bidirectional converter unit by using a formula (1)i：
△Ui=Ui－（U1+U2+…+Um）/m （1）
Wherein, Delta UiThe real-time deviation value of the direct-current side voltage of the bidirectional converter unit i is Ui, the direct-current side voltage of the bidirectional converter unit i is m, the total cascade number of the bidirectional converter unit is m, and i =1,2, …, m;
c) obtaining an inversion mode adjustment coefficient, and when the cascade type bidirectional converter device works in an inversion working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (2):
yi= (b/a)*△Ui＋1 （2）
wherein, yiFor the adaptive current command adjustment factor of the bidirectional converter unit i, b is an adaptive current command adjustment factor increment for adjustingA current command, a is a direct current side voltage protection value of each stage of bidirectional converter unit and is used for defining a direct current side voltage deviation limit of each stage, i =1,2, …, m;
d) obtaining a rectification mode adjustment coefficient, and when the cascade type bidirectional converter device works in a rectification working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (3):
yi= －(b/a)*△Ui＋1 （3）
wherein, yiThe method comprises the steps that an adaptive current command adjustment coefficient of a bidirectional converter unit i is obtained, b is an adaptive current command adjustment coefficient increment used for adjusting a current command, a is a direct-current side voltage protection value of each stage of bidirectional converter unit and used for limiting a direct-current side voltage deviation limit of each stage, and i =1,2, …, m;
e) dynamic adjustment of the output, according to the operating mode of the cascaded bidirectional converter arrangement, using the adaptive current command adjustment coefficient y obtained in step c) or step d)iAnd multiplying the current instruction of the closed-loop control to calculate a current instruction of a bidirectional converter unit i, and controlling the output of each bidirectional converter unit by using the obtained current instruction so as to realize power balance and direct-current side voltage balance of the m bidirectional converter units.
The invention discloses a voltage-sharing control method of a cascade bidirectional converter device, which comprises the following steps of: the cascade type bidirectional converter device is arranged according to the AC network side voltage U and the DC side voltage U of the m bidirectional converter units1、U2、…、UmThe current command of the closed-loop control obtained by the PI control is i x, the adaptive current command adjustment coefficients obtained by the m bidirectional converter units according to the formula (2) or the formula (3) are m1, m2, … and mm, and the current commands of the m bidirectional converter units are i x m1, i x m2, … and i x mm.
The invention relates to a voltage-sharing control method of a cascade type bidirectional converter device, which sets the rated voltage of a direct-current traction power grid as UForehead (forehead)The value of the adaptive current instruction adjustment coefficient increment b meets the following requirements: b is more than 0 and less than 0.5, and the direct current of each stage of bidirectional converter unitThe side voltage protection value a satisfies: (U)Forehead (forehead)/m)*10%＜a＜(UForehead (forehead)/m)*20%。
The invention has the beneficial effects that: the voltage-sharing control method of the cascade type bidirectional converter device comprises the following steps of firstly, obtaining the average value of the direct-current side voltages of all bidirectional converter units, and using the average value as a target voltage value; then, the direct current side voltage of each bidirectional converter unit is differenced with the target voltage value to obtain the deviation value of the direct current side voltage of each bidirectional converter; then, different self-adaptive current instruction regulating coefficient functions are established for a rectifying working mode and an inverting working mode of the converter device by taking the deviation amount as a variable, a self-adaptive current instruction regulating system in the working state of the rectifying or inverting mode is obtained according to the established self-adaptive current instruction regulating coefficient functions, and finally, the current instruction of each bidirectional converter unit is obtained by multiplying the current instruction regulating coefficient with a current instruction of closed-loop control, so that the control of the working state of the bidirectional converter units is realized.
It can be seen that, because different adaptive current instruction adjustment coefficient functions are established for the rectification working mode and the inversion working mode of the bidirectional converter device, under the condition that the difference value between the direct-current side voltage of the bidirectional converter unit and the target voltage value is the same, if the bidirectional converter unit is in different working modes, the current instructions output by the controller are also different, and the problem of over-compensation or under-compensation caused by the mode of fixedly adjusting the current instruction size is solved. The flexibility of product development is greatly improved.
Drawings
Fig. 1 is a topology structure diagram of a three-level cascade five-group parallel bidirectional converter in the embodiment of the invention;
FIG. 2 is a graph of an inversion mode scaling factor function and a rectification mode scaling factor function established in the present invention;
fig. 3 is a schematic view of a voltage-sharing control scheme of the cascaded bidirectional converter apparatus according to the present invention;
fig. 4 is a measured data diagram of the three-stage cascade five groups of parallel bidirectional converters in the embodiment of the present invention.
In the figure: the system comprises a direct current traction power grid 1, an alternating current power grid 2, a bidirectional converter unit 3, a power unit 4 and a transformer 5.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a topological structure diagram of a three-level cascaded five-group parallel bidirectional converter in an embodiment of the present invention is given, one end of the cascaded bidirectional converter device is connected to a dc traction network 1, the other end of the cascaded bidirectional converter device is connected to an ac power grid 2 through a transformer 5, the cascaded bidirectional converter device is formed by connecting three bidirectional converter units 3 in series, each bidirectional converter unit 3 is formed by five power units 4, the cascaded five-group parallel topological structure is the three-level cascaded five-group parallel converter device, and the power units 4 can work in a rectification mode and an inversion mode under the control of a control signal. When the power unit works in a rectification mode, electric energy on the alternating current power grid is input into the direct current traction power grid, and when the power unit works in an inversion mode, electric energy on the direct current traction power grid is input into the alternating current power grid.
The voltage-sharing control method of the cascade type bidirectional converter device is realized by the following steps:
a) acquiring direct-current side voltage, acquiring direct-current side voltage of each bidirectional converter unit, and recording the direct-current side voltage of m bidirectional converter units as U respectively1、U2、…、Um；
b) Calculating the deviation amount of the DC-side voltage, taking the average value of the DC-side voltages of the m bidirectional converter units as a voltage target value, taking the difference value of the DC-side voltage and the voltage target value of each bidirectional converter unit as the real-time deviation amount of the DC-side voltage, and calculating the real-time deviation amount delta U of the DC-side voltage of each bidirectional converter unit by using a formula (1)i：
△Ui=Ui－（U1+U2+…+Um）/m （1）
Wherein, Delta UiThe real-time deviation value of the direct-current side voltage of the bidirectional converter unit i is Ui, the direct-current side voltage of the bidirectional converter unit i is m, the total cascade number of the bidirectional converter unit is m, and i =1,2, …, m;
c) obtaining an inversion mode adjustment coefficient, and when the cascade type bidirectional converter device works in an inversion working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (2):
yi= (b/a)*△Ui＋1 （2）
wherein, yiThe method comprises the steps that an adaptive current command adjustment coefficient of a bidirectional converter unit i is obtained, b is an adaptive current command adjustment coefficient increment used for adjusting a current command, a is a direct-current side voltage protection value of each stage of bidirectional converter unit and used for limiting a direct-current side voltage deviation limit of each stage, and i =1,2, …, m;
d) obtaining a rectification mode adjustment coefficient, and when the cascade type bidirectional converter device works in a rectification working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (3):
yi= －(b/a)*△Ui＋1 （3）
wherein, yiThe method comprises the steps that an adaptive current command adjustment coefficient of a bidirectional converter unit i is obtained, b is an adaptive current command adjustment coefficient increment used for adjusting a current command, a is a direct-current side voltage protection value of each stage of bidirectional converter unit and used for limiting a direct-current side voltage deviation limit of each stage, and i =1,2, …, m;
as shown in fig. 2, a graph of the inverter mode regulation coefficient function and the rectifier mode regulation coefficient function established in the present invention is given, where a graph (a) in fig. 2 is an inverter mode regulation coefficient function curve, and a graph (b) is a rectifier mode regulation coefficient function curve, and it can be seen that, under the condition that the difference between the dc-side voltage of the bidirectional converter unit and the target voltage value is the same, if the bidirectional converter unit is in different operation modes, the obtained adaptive current command regulation coefficients are also different.
e) Dynamic adjustment of the output, according to the operating mode of the cascaded bidirectional converter arrangement, using the adaptive current command adjustment coefficient y obtained in step c) or step d)iAnd multiplying the current instruction of the closed-loop control to calculate a current instruction of a bidirectional converter unit i, and controlling the output of each bidirectional converter unit by using the obtained current instruction so as to realize power balance and direct-current side voltage balance of the m bidirectional converter units.
As shown in fig. 3, a voltage-sharing control strategy diagram of the cascaded bidirectional converter device of the present invention is provided, and the method thereof is as follows: the cascade type bidirectional converter device is arranged according to the AC network side voltage U and the DC side voltage U of the m bidirectional converter units1、U2、…、UmThe current command of the closed-loop control obtained by the PI control is i x, the adaptive current command adjustment coefficients obtained by the m bidirectional converter units according to the formula (2) or the formula (3) are m1, m2, … and mm, and the current commands of the m bidirectional converter units are i x m1, i x m2, … and i x mm.
Let the rated voltage of the DC traction network 1 be UForehead (forehead)The value of the adaptive current instruction adjustment coefficient increment b meets the following requirements: b is more than 0 and less than 0.5, and the direct-current side voltage protection value a of each stage of bidirectional converter unit meets the following requirements: (U)Forehead (forehead)/m)*10%＜a＜(UForehead (forehead)/m)*20%。
As shown in fig. 4, a measured data diagram of a three-level cascaded five-group parallel bidirectional converter in the embodiment of the present invention is given, where Ud is a total voltage on a dc side; ua1/ia1 are respectively phase A voltage/phase A current in the winding 1; ud 1/Ud 2/Ud 3 are the DC side voltage of each stage respectively; the Δ Ud1/Δ Ud2/Δ Ud3 is the real-time deviation amount of the DC side voltage of each level. From the actual measurement result, when the cascade type bidirectional converter device switches the working modes according to the bidirectional conversion control strategy and the running power is constantly changed, the voltage of each level of direct current side can be normally stable without bias voltage problem.
Claims (4)
1. A voltage-sharing control method of a cascade type bidirectional converter device is characterized in that the cascade type bidirectional converter device is formed by connecting m bidirectional converter units (3) in series, each bidirectional converter unit is formed by connecting n power units (4) in parallel, and the power units can selectively work in a rectification mode or an inversion mode; one end of the cascade type bidirectional converter device is connected to a direct current traction power grid (1), and the other end of the cascade type bidirectional converter device is connected to an alternating current power grid through a transformer (5); when the power unit works in a rectification mode, electric energy on the alternating current power grid is input into the direct current traction power grid, and when the power unit works in an inversion mode, the electric energy on the direct current traction power grid is input into the alternating current power grid; the voltage-sharing control method of the cascade bidirectional converter device is characterized by comprising the following steps: firstly, the voltage of the direct current side of each bidirectional converter unit is differed from the average value of the voltages of the direct current sides of all the bidirectional converter units, and the deviation value of the voltage of the direct current side of each bidirectional converter unit is calculated; and finally, multiplying the current instruction regulating coefficient by a current instruction of closed-loop control to realize the control of the working state of the bidirectional converter units so as to realize the power balance and the direct current side voltage balance of the m bidirectional converter units.
2. The voltage-sharing control method of the cascaded bidirectional converter device according to claim 1, wherein the voltage-sharing control method of the cascaded bidirectional converter device is specifically realized by the following steps:
a) acquiring direct-current side voltage, acquiring direct-current side voltage of each bidirectional converter unit, and recording the direct-current side voltage of m bidirectional converter units as U respectively1、U2、…、Um；
b) Calculating the deviation amount of the DC-side voltage, taking the average value of the DC-side voltages of the m bidirectional converter units as a voltage target value, taking the difference value of the DC-side voltage and the voltage target value of each bidirectional converter unit as the real-time deviation amount of the DC-side voltage, and calculating the real-time deviation amount delta U of the DC-side voltage of each bidirectional converter unit by using a formula (1)i：
△Ui=Ui－（U1+U2+…+Um）/m （1）
Wherein, Delta UiThe real-time deviation value of the direct-current side voltage of the bidirectional converter unit i is Ui, the direct-current side voltage of the bidirectional converter unit i is m, the total cascade number of the bidirectional converter unit is m, and i =1,2, …, m;
c) obtaining an inversion mode adjustment coefficient, and when the cascade type bidirectional converter device works in an inversion working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (2):
yi= (b/a)*△Ui＋1 （2）
wherein, yiThe method comprises the steps that an adaptive current command adjustment coefficient of a bidirectional converter unit i is obtained, b is an adaptive current command adjustment coefficient increment used for adjusting a current command, a is a direct-current side voltage protection value of each stage of bidirectional converter unit and used for limiting a direct-current side voltage deviation limit of each stage, and i =1,2, …, m;
d) obtaining a rectification mode adjustment coefficient, and when the cascade type bidirectional converter device works in a rectification working mode, obtaining an adaptive current instruction adjustment coefficient y of a bidirectional converter unit iiThe calculation is performed by equation (3):
yi= －(b/a)*△Ui＋1 （3）
wherein, yiThe method comprises the steps that an adaptive current command adjustment coefficient of a bidirectional converter unit i is obtained, b is an adaptive current command adjustment coefficient increment used for adjusting a current command, a is a direct-current side voltage protection value of each stage of bidirectional converter unit and used for limiting a direct-current side voltage deviation limit of each stage, and i =1,2, …, m;
e) dynamic adjustment of the output, according to the operating mode of the cascaded bidirectional converter arrangement, using the adaptive current command adjustment coefficient y obtained in step c) or step d)iAnd multiplying the current instruction of the closed-loop control to calculate a current instruction of a bidirectional converter unit i, and controlling the output of each bidirectional converter unit by using the obtained current instruction so as to realize power balance and direct-current side voltage balance of the m bidirectional converter units.
3. The voltage-sharing control method of the cascade bidirectional converter device according to claim 2, wherein the dynamic adjustment method of the output in step e) is as follows: the cascade type bidirectional converter device is arranged according to the AC network side voltage U and the DC side voltage U of the m bidirectional converter units1、U2、…、UmThe current command of the closed-loop control obtained by the PI control is i x, the adaptive current command adjustment coefficients obtained by the m bidirectional converter units according to the formula (2) or the formula (3) are m1, m2, … and mm, and the current commands of the m bidirectional converter units are i x m1, i x m2, … and i x mm.
4. Method for voltage-sharing control of a cascaded bidirectional converter arrangement according to claim 2, characterized in that the rated voltage of the dc traction network (1) is set to UForehead (forehead)The value of the adaptive current instruction adjustment coefficient increment b meets the following requirements: b is more than 0 and less than 0.5, and the direct-current side voltage protection value a of each stage of bidirectional converter unit meets the following requirements: (U)Forehead (forehead)/m)*10%＜a＜(UForehead (forehead)/m)*20%。
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