CN114142743B - Voltage-based control method, device, computer equipment and storage medium - Google Patents
Voltage-based control method, device, computer equipment and storage medium Download PDFInfo
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- CN114142743B CN114142743B CN202111307127.4A CN202111307127A CN114142743B CN 114142743 B CN114142743 B CN 114142743B CN 202111307127 A CN202111307127 A CN 202111307127A CN 114142743 B CN114142743 B CN 114142743B
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000003990 capacitor Substances 0.000 claims description 40
- 238000004590 computer program Methods 0.000 claims description 26
- 230000003068 static effect Effects 0.000 claims description 24
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000012935 Averaging Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
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- 238000013459 approach Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000003062 neural network model Methods 0.000 description 2
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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
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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
- H02M1/14—Arrangements for reducing ripples from dc 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
- 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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Abstract
The application relates to a voltage-based control method, a voltage-based control device, a computer device and a storage medium. The method comprises the following steps: according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, obtaining a circulation actual value of the bridge arm, according to the circulation actual value and the current value of the frequency doubling component, obtaining a voltage error reference value, according to the voltage error reference value and the voltage reference command value, obtaining a voltage reference value, and according to the voltage reference value, controlling circulation of the single-phase modularized multi-level converter. By adopting the method, the circulation components in the bridge arm can be prevented from flowing into the direct current side, and the normal operation of the single-phase modularized multi-level converter is ensured.
Description
Technical Field
The present disclosure relates to the field of power electronics, and in particular, to a voltage-based control method, apparatus, computer device, and storage medium.
Background
With the development of power electronics technology, a direct current system based on a modularized Multi-level converter (Multi-level Modular Converter) has the advantages of being capable of providing reactive power support for a passive network, achieving Multi-drop power supply and the like due to the fact that the direct current system has reactive power and active power independent and rapid control functions, and is gradually applied to transformation and construction of an electrified railway.
The modularized multi-level converter is divided into three phases and single phases, in the prior art, in order not to reduce the output power of a motor of a locomotive, and meanwhile, the construction cost of a contact net and power supply equipment is considered, and an electrified railway in China adopts a single-phase power frequency power supply mode.
In the prior art, a power supply mode of single-phase power frequency can lead a circulation component in a bridge arm to flow into a direct current side, and the single-phase modularized multi-level converter can be damaged.
Disclosure of Invention
In view of the above, it is necessary to provide a voltage-based control method, a voltage-based control device, a voltage-based control computer device, and a voltage-based storage medium that can prevent a circulating current component in a bridge arm from flowing into a dc side.
A voltage-based control method, the method comprising:
according to current values of upper and lower bridge arms of the single-phase modularized multi-level converter, obtaining actual circulation values of the bridge arms of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
And controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
In one embodiment, the obtaining the actual circulation value of the bridge arm according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter includes:
and averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm.
In one embodiment, the obtaining a voltage error reference value according to the circulation current actual value and the frequency doubling component current value includes:
and carrying out two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain the voltage error reference value.
In one embodiment, the performing two-phase stationary and two-phase rotating coordinate conversion on the actual circulation value and the current value of the frequency doubling component to obtain the voltage error reference value includes:
converting the circulation actual value and the double frequency component current value from a two-phase static coordinate system to a two-phase rotating coordinate to obtain a current error value;
converting the current error value into a voltage error value through a PI regulator;
And converting the voltage error value from the two-phase rotation coordinate to the two-phase static coordinate system to obtain the voltage error reference value.
In one embodiment, the method further comprises:
averaging the capacitance voltage of the submodules of the single-phase modularized multi-level converter to obtain an average capacitance voltage value;
and acquiring the voltage reference instruction value according to the capacitance voltage average value and the capacitance voltage reference value.
In one embodiment, the obtaining the voltage reference command value according to the capacitance voltage average value and the capacitance voltage reference value includes:
and regulating the capacitance voltage average value according to the capacitance voltage reference value through a PI regulator to obtain the voltage reference instruction value.
In one embodiment, obtaining the voltage reference value according to the voltage error reference value and the voltage reference command value includes:
if the voltage reference command value is larger than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are subjected to difference to obtain the voltage reference value;
and if the voltage reference command value is smaller than the capacitor voltage reference value, summing the voltage reference command value and the voltage error reference value to obtain the voltage reference value.
A voltage-based control device, the device comprising:
the first acquisition module is used for acquiring the actual circulation value of the bridge arm of the single-phase modularized multi-level converter according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter;
the second acquisition module is used for acquiring a voltage error reference value according to the circulation actual value and the double frequency component current value;
the third acquisition module is used for acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
and the control module is used for controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
according to current values of upper and lower bridge arms of the single-phase modularized multi-level converter, obtaining actual circulation values of the bridge arms of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
Acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
and controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
according to current values of upper and lower bridge arms of the single-phase modularized multi-level converter, obtaining actual circulation values of the bridge arms of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
and controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
According to the control method, the device, the computer equipment and the storage medium based on the voltage, firstly, the circulation actual value of the bridge arm is obtained according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, then the voltage error reference value is obtained according to the circulation actual value and the current value of the frequency doubling component, then the voltage reference value is obtained according to the voltage error reference value and the voltage reference command value, finally the circulation of the single-phase modularized multi-level converter is controlled according to the voltage reference value, the voltage reference command value is input into the controller, the controller generates PWM signals, the on-off of the switching tube is completed according to the PWM signals, and the on-off of the switching tube is used for charging the capacitor of the submodule or not through controlling the voltage error reference value, so that the current value of the frequency doubling component is reduced, the circulation component in the bridge arm is prevented from flowing into the direct current side, and the single-phase modularized multi-level converter can work normally.
Drawings
FIG. 1 is a diagram of an application environment for a voltage-based control method in one embodiment;
FIG. 2 is a flow chart of a voltage-based control method in one embodiment;
fig. 3 is an equivalent circuit schematic diagram of a single-phase modular multilevel converter;
FIG. 4 is a flow chart of a voltage-based control method according to another embodiment;
FIG. 5 is a flow chart of a voltage-based control method according to another embodiment;
FIG. 6 is a flow chart of a voltage-based control method according to another embodiment;
FIG. 7 is a flow chart of a voltage-based control method according to another embodiment;
FIG. 8 is a flow chart of a voltage-based control method according to another embodiment;
FIG. 9 is a block diagram of a voltage-based control device in one embodiment;
FIG. 10 is a block diagram of a voltage-based control apparatus in another embodiment;
FIG. 11 is a block diagram of a voltage-based control apparatus in yet another embodiment;
FIG. 12 is a block diagram of a voltage-based control apparatus in yet another embodiment;
FIG. 13 is a block diagram of a voltage-based control apparatus in yet another embodiment;
FIG. 14 is a block diagram of a voltage-based control apparatus in yet another embodiment;
Fig. 15 is an internal structural diagram of a server in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The voltage-based control method provided by the application can be applied to a power grid system and can be applied to an application environment shown in fig. 1. The application environment can comprise a converter 1 and a server 2, wherein the server 2 can be used for acquiring a circulation current actual value of a bridge arm of the single-phase modularized multi-level converter according to current values of upper and lower bridge arms of the single-phase modularized multi-level converter, acquiring a voltage error reference value according to the circulation current actual value and a double frequency component current value, acquiring a voltage reference value according to the voltage error reference value and a voltage reference command value, and finally controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value. The server may be implemented as a stand-alone server or as a server cluster formed by a plurality of servers.
In one embodiment, as shown in fig. 2, a voltage-based control method is provided, and the method is applied to the server in fig. 1 for illustration, and includes the following steps:
s201, obtaining the actual circulation value of the bridge arm of the single-phase modularized multi-level converter according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter.
The single-phase modularized multi-level converter comprises two phases of four bridge arms, each bridge arm is formed by connecting a plurality of half-bridge submodules with a bridge arm inductor in series, the direct current side of the single-phase modularized multi-level converter is provided with constant direct current voltage by a direct current power supply, and the alternating current side is connected into a single-phase power grid through a network side inductor.
Specifically, the server may average the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modular multilevel converter, and use the obtained average value as the actual circulation value of the bridge arm. Optionally, the server may perform weighted averaging on the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter, and use the obtained weighted average value as the actual circulation value of the bridge arm. This embodiment is not limited thereto.
Exemplary, FIG. 3 is a schematic diagram of an equivalent circuit of a single-phase modular multilevel converter, top is a positive DC bus of the single-phase modular multilevel converter, bot is a negative DC bus of the single-phase modular multilevel converter, U top Is the equivalent voltage of an upper bridge arm of a phase U bot Is equivalent voltage of a lower bridge arm of a phase, i arm,top I is the current flowing through the upper bridge arm of the a phase arm,bot I is the current flowing through the lower bridge arm of the a phase dif For circulating current actual value i flowing through upper and lower bridge arms simultaneously a The a phase outputs alternating current. DC side voltage U in single-phase modularized multi-level converter dc Current i of upper bridge arm arm,top Current i of lower bridge arm arm,bot Bridge arm circulation i dif The relationship between them can be expressed as:
the sum of the output voltages of the upper and lower legs is referred to as the leg output voltage, which can be expressed as U top +U bot DC side voltage U dc With output voltage U of bridge arm top +U bot Is referred to as a voltage difference, which may be denoted as U dc -(U top +U bot ) Bridge arm circulation i in single-phase modularized multi-level converter dif And voltage difference U dc -(U top +U bot ) Bridge arm circulation i in proportional, single-phase modularized multi-level converter dif Inversely proportional to the bridge arm impedance value.
S202, obtaining a voltage error reference value according to the circulation current actual value and the double frequency component current value.
Wherein, the frequency doubling component current value can be expressed by angular frequency, and the frequency doubling component current value can be expressed as:
2θ ref ＝2wt，
w＝2πf
wherein 2 theta ref The current value of the frequency doubling component is, w is the angular frequency, t is the time, f is the signal frequency, and the signal frequency can be 50HZ.
Specifically, the server can convert the actual circulation value and the current value of the frequency doubling component into voltage values through the corresponding relation between the voltage and the current, and the obtained voltage values are used as voltage error reference values. Optionally, the server may convert the actual circulation value and the current value of the frequency doubling component into a voltage value through a PI regulator, and use the obtained voltage value as a voltage error reference value.
S203, acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value.
Specifically, the server may construct a corresponding neural network model, input the voltage error reference value and the voltage reference command value into the neural network model, and output the voltage reference value after training. Alternatively, the server may sum the voltage error reference value with the voltage reference command value to obtain the voltage reference value. For example, when the voltage reference command value is 0.91 and the voltage error reference value is 0.09, the voltage reference command value and the voltage error reference value are summed to obtain a voltage reference value of 1.
S204, controlling the circulation of the single-phase modularized multi-level converter according to the voltage reference value.
Specifically, the converter may include a controller, the voltage reference value is input to a specific controller in the converter, the controller generates a pulse width modulation (Pulse width modulation, PWM) signal according to the voltage reference value, and controls the voltage reference command value to approach the voltage reference value according to the generated PWM signal, so that the voltage error reference value approaches zero, and the current value of the frequency doubling component approaches zero, thereby suppressing the circulation of the single-phase modular multilevel converter.
According to the control method based on the voltage, firstly, the actual circulation value of the bridge arm is obtained according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, then the voltage error reference value is obtained according to the actual circulation value and the current value of the frequency doubling component, then the voltage reference value is obtained according to the voltage error reference value and the voltage reference command value, finally the circulation of the single-phase modularized multi-level converter is controlled according to the voltage reference value, the voltage reference command value is input into the controller, the controller generates PWM signals, whether the capacitors of the sub-modules are charged or not is controlled according to the PWM signals, the voltage error reference value is reduced, the current value of the frequency doubling component is reduced, the circulation component in the bridge arm is prevented from flowing into the direct current side, and the single-phase modularized multi-level converter can work normally.
Optionally, a specific implementation manner of S201 "obtaining the actual circulating current value of the bridge arm of the single-phase modularized multi-level converter according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter" is provided, and the method includes: and averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm.
In particular, the current value of the upper leg of the single-phase modular multilevel converter may be expressed as i arm,top The current value of the lower bridge arm of the single-phase modular multilevel converter can be expressed as i arm,bot The actual value of the loop current of the bridge arm can be expressed as i dif Taking the average value of the current value of the upper bridge arm and the current value of the lower bridge arm as the actual circulating current value of the bridge arm, the actual circulating current value of the bridge arm can be expressed as:
in the voltage-based control method, the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter are averaged, so that the actual circulation value of the bridge arm is more reasonable and accurate.
Optionally, a specific implementation manner of S202 "obtaining a voltage error reference value according to the actual value of the loop current and the current value of the frequency doubling component" is provided, and the method includes: and carrying out two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain a voltage error reference value.
Specifically, the current values of the circulation actual value and the frequency doubling component are input into the two-phase static and two-phase rotating coordinate system to obtain the current error value under the two-phase rotating coordinate system, the current error value under the two-phase rotating coordinate system can be converted into the voltage error value under the two-phase rotating coordinate system through a voltage-current converter, the current error value under the two-phase rotating coordinate system can also be converted into the voltage error value under the two-phase rotating coordinate system through a PI regulator, then the voltage error value under the two-phase rotating coordinate system is converted into the voltage error value under the two-phase static coordinate system, and the voltage error value under the two-phase static coordinate system is used as the voltage error reference value.
In the voltage-based control method, the two-phase stationary and two-phase rotating coordinate conversion is carried out on the circulation current actual value and the double frequency component current value, and the value under the two-phase rotating coordinate system is unique, so that the voltage error reference value obtained through the two-phase stationary and two-phase rotating coordinate conversion is more accurate.
Based on the embodiment shown in fig. 2, as shown in fig. 4, in another embodiment, a specific implementation process of performing two-phase stationary and two-phase rotating coordinate conversion on the actual value of the loop current and the current value of the frequency doubling component to obtain a voltage error reference value is described in detail, including:
s401, converting the circulation current actual value and the frequency doubling component current value from a two-phase static coordinate system to a two-phase rotating coordinate system to obtain a current error value.
Specifically, the two-phase stationary coordinate system refers to an αβ coordinate system, the two-phase rotational coordinate system refers to a dq coordinate system, and the process of converting the circulation current actual value and the frequency doubling component current value from the two-phase stationary coordinate system to the two-phase rotational coordinate system may be expressed as:
furthermore, the obtained current value of the frequency doubling component under the dq coordinate system can be used as a current error value.
S402, converting the current error value into a voltage error value through a PI regulator.
Specifically, the PI regulator is also called an error controller, and when there is an error between the actual measurement value and the standard value, the actual measurement value is moved to the standard value using the PI regulator. The transfer function of the PI regulator can be expressed as:
wherein K is P Is a proportionality coefficient, K i Is an integral coefficient.
Further, the current error value under the two-phase rotation coordinate system is input into the PI regulator, and the voltage error value under the two-phase rotation coordinate system is obtained through transfer function calculation.
S403, converting the voltage error value from the two-phase rotation coordinate to the two-phase static coordinate system to obtain a voltage error reference value.
Specifically, the voltage error value under the two-phase rotation coordinate system is input into the two-phase rotation and two-phase static coordinate system, the voltage error value under the two-phase static coordinate system is obtained, and the voltage error value under the two-phase static coordinate system is used as the voltage error reference value.
In the voltage-based control method, the current error value is obtained by converting the current actual value and the current value of the frequency doubling component from the two-phase static coordinate system to the two-phase rotating coordinate system, then the current error value is converted into the voltage error value through the PI regulator, then the voltage error value is converted from the two-phase rotating coordinate system to the two-phase static coordinate system, the voltage error reference value is obtained, the current error value in the two-phase static coordinate system is unique, and meanwhile the current error value is converted into the voltage error value through the PI regulator, so that the control of the capacitance voltage of the submodule is facilitated.
Based on the embodiment shown in fig. 2, as shown in fig. 5, in another embodiment, how to obtain the voltage reference command value is specifically described, including:
s501, capacitance voltage of the submodules of the single-phase modularized multi-level converter is averaged to obtain an average value of the capacitance voltage.
Specifically, the single-phase modularized multi-level converter comprises a plurality of sub-modules, capacitance voltage values of the sub-modules are summed, the sum result is divided by the number of capacitance voltages of the sub-modules, and the obtained result is used as a capacitance voltage average value. For example, the capacitance voltage of a sub-module of a single-phase modular multilevel converter may be represented as v c,1 ,v c,2 ,…,v c,n The number of the capacitance voltages of the submodules is n, and the average value of the capacitance voltages is sigma v c,n /n。
S502, obtaining a voltage reference instruction value according to the capacitance voltage average value and the capacitance voltage reference value.
The voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter.
Specifically, the server may perform weighted summation on the capacitance voltage average value and the capacitance voltage reference value, and use the obtained summation result as the voltage reference command value. Optionally, the average value of the capacitor voltage may be adjusted by the PI regulator, so that the average value of the capacitor voltage is more similar to the reference value of the capacitor voltage, and the reference command value of the voltage is output by the PI regulator. There is an error between the capacitance voltage average value and the capacitance voltage reference value, and the obtained voltage reference command value is more similar to the capacitance voltage reference value.
Optionally, the step of obtaining the voltage reference command value according to the capacitance voltage average value and the capacitance voltage reference value includes: and regulating the average value of the capacitor voltage according to the capacitor voltage reference value through the PI regulator to obtain a voltage reference instruction value.
Specifically, comparing the capacitance voltage reference value with the capacitance voltage average value, and when the capacitance voltage average value is larger than the capacitance voltage reference value, reducing the capacitance voltage average value through the PI regulator to enable the obtained voltage reference instruction value to be closer to the capacitance voltage reference value; when the average value of the capacitor voltage is smaller than the reference value of the capacitor voltage, the average value of the capacitor voltage is increased through the PI regulator, so that the obtained reference command value of the voltage is closer to the reference value of the capacitor voltage. For example, the average value of the capacitor voltage is 1.2, and the reference value of the capacitor voltage is 1, and in this case, the error between the two values needs to be reduced by the PI regulator, so that the output voltage reference command value is more approximate to 1.
In the voltage-based control method, the PI regulator is used for regulating the average value of the capacitor voltage according to the reference value of the capacitor voltage, so that the voltage reference command value is obtained more accurately.
In the voltage-based control method, firstly, the capacitance voltage of the submodule of the single-phase modularized multi-level converter is averaged to obtain the capacitance voltage average value, so that fluctuation of the capacitance voltage of the submodule in the same bridge arm can be balanced, and then, the obtained voltage reference command value is more accurate according to the capacitance voltage average value and the capacitance voltage reference value.
Optionally, a specific implementation manner of S203 "obtaining the voltage reference value according to the voltage error reference value and the voltage reference command value" is provided, as shown in fig. 6, and the method includes:
s601, judging the magnitude of a voltage reference command value and a capacitance voltage reference value, if so, namely, the voltage reference command value is larger than the capacitance voltage reference value, executing step S602; if not, i.e. the voltage reference command value is smaller than the capacitor voltage reference value, step S603 is performed.
S602, the voltage reference command value and the voltage error reference value are subjected to difference to obtain the voltage reference value.
Specifically, when the voltage reference command value is greater than the capacitor voltage reference value, the voltage reference command value is expressed as v c,ref The voltage error reference value is denoted as v c And (3) performing difference between the voltage reference command value and the voltage error reference value to obtain a voltage reference value, wherein the voltage reference value can be expressed as:
v αβ,ref ＝v c,ref -v c ，
for example, when the voltage reference command value is 1.1, the capacitance voltage reference value is 1.05, the capacitance voltage reference command value is greater than the capacitance voltage reference value, and the voltage error reference value is 0.1, the voltage reference value is 1.1-0.1=1.
S603, summing the voltage reference command value and the voltage error reference value to obtain a voltage reference value.
Specifically, when the voltage reference command value is smaller than the capacitance voltage reference value, the voltage reference value may be expressed as:
v αβ,ref ＝v c,ref +v c ，
for example, when the voltage reference command value is 0.9, the capacitance voltage reference value is 0.95, the capacitance voltage reference command value is greater than the capacitance voltage reference value, and the voltage error reference value is 0.1, the voltage reference value is 0.9+0.1=1.
In the voltage-based control method, if the voltage reference command value is greater than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are differenced to obtain the voltage reference value; if the voltage reference command value is smaller than the capacitor voltage reference value, summing the voltage reference command value and the voltage error reference value to obtain a voltage reference value, and determining the voltage reference value according to the conditions by judging the sizes of the voltage reference command value and the capacitor voltage reference value, so that the determined voltage reference value is more accurate.
In one embodiment, as shown in fig. 7, for ease of understanding to those skilled in the art, a method of project case testing is described in detail below, which may include:
s701, averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm;
S702, converting the circulation current actual value and the frequency doubling component current value from a two-phase static coordinate system to a two-phase rotating coordinate to obtain a current error value;
s703, converting the current error value into a voltage error value through a PI regulator;
s704, converting the voltage error value from the two-phase rotation coordinate to the two-phase static coordinate system to obtain a voltage error reference value;
s705, averaging the capacitance voltage of the sub-modules of the single-phase modularized multi-level converter to obtain an average value of the capacitance voltage;
s706, adjusting the average value of the capacitor voltage according to the reference value of the capacitor voltage through a PI adjuster to obtain a voltage reference instruction value;
s707, acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value;
and S708, controlling the circulation of the single-phase modularized multi-level converter according to the voltage reference value.
It should be noted that, for the description in S701-S708, reference may be made to the description related to the above embodiment, and the effects thereof are similar, which is not repeated here.
Further, the voltage-based control method provided by the present application is described in detail with reference to the flowchart shown in fig. 8, and for the voltage-based control method, the current value i of the upper bridge arm of the single-phase modular multilevel converter is first described arm,top And the current value i of the lower bridge arm arm,bot Averaging to obtain the actual circulation value i of the bridge arm dif Converting the current values of the circulation actual value and the frequency doubling component from an alpha beta coordinate system to a dq coordinate system to obtain a current error value under a two-phase rotation coordinate system, converting the current error value under the two-phase rotation coordinate system into a voltage error value under the two-phase rotation coordinate system through a PI regulator, and converting the voltage error value under the two-phase rotation coordinate system into a voltage error reference value v under a two-phase static coordinate system c Then, the capacitance voltage of the submodule of the single-phase modularized multi-level converter is averaged to obtain a capacitance voltage average value, and the capacitance voltage average value is regulated according to a capacitance voltage reference value through a PI regulator to obtain a voltage reference command value v c,ref Then according to the voltage error reference value v c And a voltage reference command value v c,ref Obtaining a voltage reference value v αβ,ref And finally, controlling the circulation of the single-phase modularized multi-level converter according to the voltage reference value.
In the voltage-based control method, firstly, the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter are averaged to obtain the circulation actual value of the bridge arm, the circulation actual value and the current value of the double frequency component are converted into the two-phase rotation coordinate from the two-phase static coordinate system to obtain the current error value, the current error value is converted into the voltage error value through the PI regulator, the voltage error value is converted into the two-phase static coordinate system to obtain the voltage error reference value, then the capacitance voltage of the sub-module of the single-phase modularized multi-level converter is averaged to obtain the capacitance voltage average value, the capacitance voltage average value is regulated through the PI regulator according to the capacitance voltage reference value to obtain the voltage reference command value, then the voltage reference value is obtained according to the voltage error reference value and the voltage reference command value, and finally the voltage reference value is input into the controller, and the controller generates PWM signal to control the capacitance voltage value of the sub-module, so that the voltage error value of the voltage error value is reduced, namely the current value of the double frequency component is reduced.
It should be understood that, although the steps in the flowcharts of fig. 2 and 4-8 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of fig. 2, 4-8 may include steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
In one embodiment, as shown in fig. 9, there is provided a voltage-based control apparatus comprising: a first acquisition module 11, a second acquisition module 12, a third acquisition module 13, and a control module 14, wherein:
the first obtaining module 11 is configured to obtain a circulation current actual value of the bridge arm according to current values of the upper and lower bridge arms of the single-phase modularized multi-level converter;
A second obtaining module 12, configured to obtain a voltage error reference value according to the actual circulation value and the current value of the frequency doubling component;
a third obtaining module 13, configured to obtain a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the sub-module of the single-phase modularized multi-level converter;
a control module 14 for controlling the circulating current of the single-phase modular multilevel converter according to the voltage reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 10, the first acquisition module 11 includes: a first acquisition unit 111, wherein:
the first obtaining unit 111 is configured to average a current value of an upper bridge arm and a current value of a lower bridge arm of the single-phase modular multilevel converter, so as to obtain a circulation actual value of the bridge arm.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 11, the second acquisition module 12 includes: a second acquisition unit 121 in which:
The second obtaining unit 121 is configured to perform two-phase stationary and two-phase rotating coordinate conversion on the circulation current actual value and the frequency doubling component current value, so as to obtain a voltage error reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
On the basis of the above embodiment, optionally, the second obtaining unit 121 is specifically configured to convert the actual circulation current value and the current value of the frequency doubling component from the two-phase stationary coordinate system to the two-phase rotating coordinate system to obtain a current error value; converting the current error value into a voltage error value through a PI regulator; and converting the voltage error value from the two-phase rotating coordinate to the two-phase stationary coordinate system to obtain a voltage error reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 12, the apparatus further includes: a fourth acquisition module 15, a fifth acquisition module 16, wherein:
a fourth obtaining module 15, configured to average the capacitance voltage of the sub-modules of the single-phase modularized multi-level converter to obtain an average capacitance voltage value;
And a fifth acquiring module 16, configured to acquire a voltage reference command value according to the capacitance voltage average value and the capacitance voltage reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 13, the fifth obtaining module 16 includes: a third acquisition unit 161 in which:
the third obtaining unit 161 is configured to obtain a voltage reference command value by adjusting, by the PI regulator, the average value of the capacitor voltage according to the capacitor voltage reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
In one embodiment, as shown in fig. 14, the third acquisition module 13 includes: a fourth acquisition unit 131, a fifth acquisition unit 132, wherein:
a fourth obtaining unit 131, configured to, when the voltage reference command value is greater than the capacitor voltage reference value, perform a difference between the voltage reference command value and the voltage error reference value to obtain a voltage reference value;
the fifth obtaining unit 132 is configured to sum the voltage reference command value and the voltage error reference value to obtain a voltage reference value when the voltage reference command value is smaller than the capacitor voltage reference value.
The voltage-based control device provided in this embodiment may perform the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.
For specific limitations of the voltage-based control device, reference may be made to the above limitations of the voltage-based control method, and no further description is given here. The various modules in the voltage-based control apparatus described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a server is provided, the internal structure of which may be as shown in fig. 15. The server includes a processor, memory, and a network interface connected by a system bus. Wherein the processor of the server is configured to provide computing and control capabilities. The memory of the server includes nonvolatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the server is used for storing measurement data of the individual elements in the converter. The network interface of the server is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a voltage-based control method.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, obtaining the actual circulation value of the bridge arm of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the sub-module of the single-phase modularized multi-level converter;
and controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
In one embodiment, the processor when executing the computer program further performs the steps of: according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, obtaining the actual circulation value of the bridge arm comprises the following steps:
and averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm.
In one embodiment, the processor when executing the computer program further performs the steps of: obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value, including:
And carrying out two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain a voltage error reference value.
In one embodiment, the processor when executing the computer program further performs the steps of: performing two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain a voltage error reference value, wherein the method comprises the following steps:
converting the circulation current actual value and the frequency doubling component current value from a two-phase static coordinate system to a two-phase rotating coordinate to obtain a current error value;
converting the current error value into a voltage error value through a PI regulator;
and converting the voltage error value from the two-phase rotating coordinate to the two-phase stationary coordinate system to obtain a voltage error reference value.
In one embodiment, the processor when executing the computer program further performs the steps of:
averaging the capacitance voltage of the sub-modules of the single-phase modularized multi-level converter to obtain an average capacitance voltage value;
and obtaining a voltage reference instruction value according to the capacitance voltage average value and the capacitance voltage reference value.
In one embodiment, the processor when executing the computer program further performs the steps of: according to the capacitance voltage average value and the capacitance voltage reference value, obtaining a voltage reference instruction value comprises the following steps:
And regulating the average value of the capacitor voltage according to the capacitor voltage reference value through the PI regulator to obtain a voltage reference instruction value.
In one embodiment, the processor when executing the computer program further performs the steps of: according to the voltage error reference value and the voltage reference command value, obtaining the voltage reference value comprises the following steps:
if the voltage reference command value is larger than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are subjected to difference to obtain a voltage reference value;
and if the voltage reference command value is smaller than the capacitor voltage reference value, summing the voltage reference command value and the voltage error reference value to obtain a voltage reference value.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, obtaining the actual circulation value of the bridge arm of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; the voltage reference command value is determined according to the capacitance voltage of the sub-module of the single-phase modularized multi-level converter;
And controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
In one embodiment, the computer program when executed by the processor further performs the steps of: according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter, obtaining the actual circulation value of the bridge arm comprises the following steps:
and averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm.
In one embodiment, the computer program when executed by the processor further performs the steps of: obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value, including:
and carrying out two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain a voltage error reference value.
In one embodiment, the computer program when executed by the processor further performs the steps of: performing two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain a voltage error reference value, wherein the method comprises the following steps:
converting the circulation current actual value and the frequency doubling component current value from a two-phase static coordinate system to a two-phase rotating coordinate to obtain a current error value;
Converting the current error value into a voltage error value through a PI regulator;
and converting the voltage error value from the two-phase rotating coordinate to the two-phase stationary coordinate system to obtain a voltage error reference value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
averaging the capacitance voltage of the sub-modules of the single-phase modularized multi-level converter to obtain an average capacitance voltage value;
and obtaining a voltage reference instruction value according to the capacitance voltage average value and the capacitance voltage reference value.
In one embodiment, the computer program when executed by the processor further performs the steps of: according to the capacitance voltage average value and the capacitance voltage reference value, obtaining a voltage reference instruction value comprises the following steps:
and regulating the average value of the capacitor voltage according to the capacitor voltage reference value through the PI regulator to obtain a voltage reference instruction value.
In one embodiment, the computer program when executed by the processor further performs the steps of: according to the voltage error reference value and the voltage reference command value, obtaining the voltage reference value comprises the following steps:
if the voltage reference command value is larger than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are subjected to difference to obtain a voltage reference value;
And if the voltage reference command value is smaller than the capacitor voltage reference value, summing the voltage reference command value and the voltage error reference value to obtain a voltage reference value.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A voltage-based control method, the method comprising:
according to current values of upper and lower bridge arms of the single-phase modularized multi-level converter, obtaining actual circulation values of the bridge arms of the single-phase modularized multi-level converter;
obtaining a voltage error reference value according to the circulation actual value and the double frequency component current value;
acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; according to the voltage error reference value and the voltage reference command value, the obtaining the voltage reference value includes: if the voltage reference command value is larger than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are subjected to difference to obtain the voltage reference value; if the voltage reference command value is smaller than the capacitor voltage reference value, summing the voltage reference command value and the voltage error reference value to obtain the voltage reference value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
And controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
2. The method according to claim 1, wherein the obtaining the actual circulating current value of the bridge arm according to the current values of the upper and lower bridge arms of the single-phase modular multilevel converter includes:
and averaging the current value of the upper bridge arm and the current value of the lower bridge arm of the single-phase modularized multi-level converter to obtain the actual circulation value of the bridge arm.
3. The method according to claim 1 or 2, wherein said obtaining a voltage error reference value from said actual value of the circulating current and a value of the doubled component current comprises:
and carrying out two-phase stationary and two-phase rotating coordinate conversion on the circulation actual value and the double frequency component current value to obtain the voltage error reference value.
4. A method according to claim 3, wherein said performing two-phase stationary and two-phase rotating coordinate conversion on said actual value of the circulating current and said current value of the frequency doubling component to obtain said voltage error reference value comprises:
converting the circulation actual value and the double frequency component current value from a two-phase static coordinate system to a two-phase rotating coordinate system to obtain a current error value;
Converting the current error value into a voltage error value through a PI regulator;
and converting the voltage error value from the two-phase rotating coordinate system to the two-phase static coordinate system to obtain the voltage error reference value.
5. The method of claim 4, wherein said converting said current error value to a voltage error value by a PI regulator comprises:
and inputting the current error value into the PI regulator, and obtaining the voltage error value through transfer function calculation.
6. The method according to claim 1 or 2, characterized in that the method further comprises:
averaging the capacitance voltage of the submodules of the single-phase modularized multi-level converter to obtain an average capacitance voltage value;
and acquiring the voltage reference instruction value according to the capacitance voltage average value and the capacitance voltage reference value.
7. The method of claim 6, wherein the obtaining the voltage reference command value from the capacitance voltage average value and the capacitance voltage reference value comprises:
and regulating the capacitance voltage average value according to the capacitance voltage reference value through a PI regulator to obtain the voltage reference instruction value.
8. A voltage-based control device, the device comprising:
the first acquisition module is used for acquiring the actual circulation value of the bridge arm of the single-phase modularized multi-level converter according to the current values of the upper bridge arm and the lower bridge arm of the single-phase modularized multi-level converter;
the second acquisition module is used for acquiring a voltage error reference value according to the circulation actual value and the double frequency component current value;
the third acquisition module is used for acquiring a voltage reference value according to the voltage error reference value and the voltage reference command value; according to the voltage error reference value and the voltage reference command value, the obtaining the voltage reference value includes: under the condition that the voltage reference command value is larger than the capacitor voltage reference value, the voltage reference command value and the voltage error reference value are subjected to difference to obtain the voltage reference value; summing the voltage reference command value and the voltage error reference value to obtain the voltage reference value under the condition that the voltage reference command value is smaller than the capacitor voltage reference value; the voltage reference command value is determined according to the capacitance voltage of the submodule of the single-phase modularized multi-level converter;
And the control module is used for controlling the circulation current of the single-phase modularized multi-level converter according to the voltage reference value.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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