CN111864816A - Power supply control method and device, electronic equipment and storage medium - Google Patents
Power supply control method and device, electronic equipment and storage medium Download PDFInfo
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
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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
- H02M3/00—Conversion of dc power input into dc 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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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
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Abstract
The invention discloses a power supply control method, a power supply control device, electronic equipment and a storage medium, wherein the method comprises the following steps: calculating the target power of each bidirectional power conversion unit at a direct current bus node; distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power; and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value. The method can solve the problems that overload occurs to part of bidirectional power conversion units in the alternating current and direct current hybrid power supply system or power is not distributed according to expectation, and can avoid the problems that uncertain paths exist to the power flow of the multi-port hybrid power supply system and the power distribution is unbalanced.
Description
Technical Field
The present invention relates to the field of power electronics technologies, and in particular, to a power supply control method and apparatus, an electronic device, and a storage medium.
Background
In a system with hybrid power supply of alternating current and direct current electric energy sources, the power electronic conversion device is expected to flow in two directions at each energy port like an energy pipeline to form an alternating current and direct current hybrid energy pipeline system. Most of the traditional power electronic conversion units are unidirectional, energy flows in one direction fixedly, and only when the load is over-powered, the over-power of the power electronic conversion unit can be caused; the single bidirectional power electronic conversion unit has only two ports, and the flow path of energy is fixed. However, in a multi-port energy conduit system, if each individual bidirectional power electronic conversion unit is controlled independently according to a conventional control method, there is a problem in that energy flows freely between the individual energy ports, easily resulting in overload of local modules or an undesirable energy flow direction.
Disclosure of Invention
The invention provides a power supply control method, a power supply control device, electronic equipment and a storage medium, wherein the power supply control method can solve the problems that overload occurs or power is not distributed according to expectation in a part of bidirectional power conversion units in an alternating current and direct current hybrid power supply system, and can avoid the problems that an uncertain path occurs to power flow of a multi-port hybrid power supply system and power distribution is unbalanced.
In a first aspect, an embodiment of the present invention provides a power supply control method, which is applied to an ac/dc power source hybrid power supply system, where the system includes a plurality of bidirectional power conversion units and a dc bus, first ends of the plurality of bidirectional power conversion units are all connected to the dc bus, and second ends of the plurality of bidirectional power converters are connected to different power sources, where the control method includes:
calculating the target power of each bidirectional power conversion unit at a direct current bus node;
distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power;
and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value.
In one possible embodiment, the determining the target power of each of the bidirectional power conversion units at the dc bus node includes:
collecting a voltage value and a current value of a first end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit.
In one possible embodiment, the determining the target power of each of the bidirectional power conversion units at the dc bus node includes:
acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit.
In one possible embodiment, the preset power allocation scheme includes one or more of the following:
the given power is not more than the rated power distribution of the bidirectional power conversion unit;
distributing according to a preset power distribution proportion;
are assigned in a preset priority order.
In a possible implementation, the controlling that an absolute value of a difference between the power of each of the bidirectional power conversion units and the given power is not greater than a preset threshold includes:
And carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
In a second aspect, an embodiment of the present invention provides a power supply control apparatus, including:
the calculation module is used for calculating the target power of each bidirectional power conversion unit at a direct current bus node;
the power distribution module is used for distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power;
and the control module is used for controlling the absolute value of the difference value between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value.
In a possible implementation manner, the calculation module is specifically configured to:
collecting a voltage value and a current value of a first end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit.
In a possible implementation manner, the calculation module is specifically configured to:
acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit;
And calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit.
In one possible embodiment, the preset power allocation scheme includes one or more of the following:
the given power is not more than the rated power distribution of the bidirectional power conversion unit;
distributing according to a preset power distribution proportion;
are assigned in a preset priority order.
In a possible implementation, the control module is specifically configured to: and carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
a memory for storing program instructions;
a processor for calling the program instructions stored in said memory and for executing the steps comprised in the method as described in the various possible designs of the first aspect in accordance with the obtained program instructions.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing a computer program comprising program instructions which, when executed by a computer, cause the computer to perform the steps included in the method as set forth in the various possible designs of the first aspect.
The power supply control method provided by the embodiment of the invention comprises the steps of calculating the target power of each bidirectional power conversion unit at a direct current bus node; distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power; and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value. In the control method, an alternating current-direct current hybrid power supply system consisting of a plurality of bidirectional power conversion units is regarded as an energy pipeline system, each bidirectional power conversion unit is regarded as a power valve of the energy pipeline system, given power of each bidirectional power conversion unit at a direct current bus node is distributed according to a preset power distribution scheme, the absolute value of the difference value between the power of each bidirectional power conversion unit and the given power is controlled not to be larger than a preset threshold value, energy at the direct current bus node is dispatched in a centralized mode, the problem that part of the bidirectional power conversion units in the alternating current-direct current hybrid power supply system are overloaded or power is not distributed according to expectation can be solved, and the problem that the power of the multi-port hybrid power supply system flows out of uncertain paths and the power distribution is unbalanced can be avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an AC/DC hybrid power supply system;
fig. 2 is a schematic circuit structure diagram of an ac-dc hybrid power supply system according to an embodiment of the present invention;
fig. 3 is a flowchart of a power supply control method according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of an ac-dc hybrid power supply system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a process for allocating constant power according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a process of driving the third switch and the fourth switch according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a closed-loop control of a first bi-directional AC/DC conversion unit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a closed-loop control of a second bi-directional AC/DC conversion unit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a closed-loop control of a DC/DC converter unit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a power supply control device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the technical solution of the embodiment of the present invention can be applied to various ac and dc hybrid power supply systems. For example, fig. 1 shows an AC-DC hybrid power supply system, which has two AC power ports and one DC power port, where the first AC power port and the second AC power port are respectively coupled to an AC power source, the DC power port is coupled to a DC power source, and the three power ports are respectively coupled to a common DC bus through three bidirectional power conversion units, specifically, the first AC power port, the second AC power port, and the DC power port are respectively coupled to the common DC bus through a first bidirectional AC/DC conversion unit 01, a second bidirectional AC/DC conversion unit 02, and a bidirectional DC/DC conversion unit 03, and the common DC bus plays a role of bus energy buffering. In the ac-dc hybrid power supply system, ac power can flow in both directions between the first ac power port and the second ac power port, and dc power can flow in both directions between the first dc power port and the first ac power port and between the first dc power port and the second ac power port.
According to different devices coupled to each power supply port, the alternating current and direct current hybrid power supply system is widely applied, for example, a first alternating current power supply port is connected with commercial power, a second alternating current power supply port is connected with a load with an energy feedback system, such as a motor load, and a first direct current power supply port is connected with a direct current energy storage device. In another application, the first alternating current power supply port is connected to the mains supply, the second alternating current power supply port is connected to another path of alternating current power supply (wind power generation, an oil engine and an uninterruptible power supply), and the first direct current power supply port is connected with the direct current energy storage device; when the second alternating current power supply port is connected to the wind power generation device, a micro-grid power generation system can be formed; when the second alternating current power supply port is connected to the oil engine device, a starting and generating device shared by alternating current and direct current can be formed; when the second alternating current power supply port is connected to the uninterruptible power supply device, a stable and reliable direct current power supply device can be formed at the first direct current power supply port.
In a specific embodiment, fig. 2 is a circuit structure diagram of an ac-dc hybrid power supply system, which includes a three-phase H-bridge circuit unit 100, a bus capacitor C, a first full-bridge network 200, a resonance unit 300, and a second full-bridge network 400 connected in sequence;
the three-phase H-bridge circuit unit 100 comprises a first bridge arm, a second bridge arm, a third bridge arm, a first inductor L1, a second inductor L2 and a third inductor L3, wherein the first bridge arm comprises a first switch S1 and a second switch S2 which are connected in series, the second bridge arm comprises a third switch S3 and a fourth switch S4 which are connected in series, the third bridge arm comprises a fifth switch S5 and a sixth switch S6 which are connected in series, the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel and respectively bridged at two ends of a bus capacitor C, a first end of a first inductor L1 is connected with a midpoint of the first bridge arm, a first end of a second inductor L2 is connected with a midpoint of the second bridge arm, and a first end of a third inductor L3 is connected with a midpoint of the third bridge arm; the midpoint of the first bridge arm is a series point of a first switch and a second switch, the midpoint of the second bridge arm is a series point of a third switch and a fourth switch, the second end of the first inductor L1 and the second end of the second inductor L2 are coupled to the first alternating current power supply port, and the second end of the second inductor L2 and the second end of the third inductor L3 are coupled to the second alternating current power supply port;
The first full-bridge network 200 comprises a fourth bridge arm and a fifth bridge arm, wherein the fourth bridge arm comprises a seventh switch S7 and an eighth switch S8 which are connected in series, the fifth bridge arm comprises a ninth switch S9 and a tenth switch S10 which are connected in series, and the fourth bridge arm and the fifth bridge arm are connected in parallel and are respectively bridged at two ends of a bus capacitor C;
the second full-bridge network 400 comprises a sixth bridge arm and a seventh bridge arm which are connected in parallel, the sixth bridge arm comprises an eleventh switch S11 and a twelfth switch S12 which are connected in series, the seventh bridge arm comprises a thirteenth switch S13 and a fourteenth switch S14 which are connected in series, and two ends of the sixth bridge arm and the seventh bridge arm of the second full-bridge network 400, which are connected in parallel, are coupled to a direct-current power supply port;
the input end of the resonance unit 300 is connected with the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm, respectively, and the output end of the resonance unit 300 is connected with the midpoint of the sixth bridge arm and the midpoint of the seventh bridge arm, respectively. The midpoint of the fourth leg is a series connection point of a seventh switch S7 and an eighth switch S8, the midpoint of the fifth leg is a series connection point of a ninth switch S9 and a tenth switch S10, the midpoint of the seventh leg is a series connection point of an eleventh switch S11 and a twelfth switch S12, and the eighth leg is a series connection point of a thirteenth switch S13 and a fourteenth switch S14.
In a specific embodiment, the resonance unit 300 may include a resonance inductance Lr, a resonance capacitance Cr, a transformer T, and an excitation inductance Lm.
The three-phase H-bridge circuit unit 100 forms two bidirectional AC/DC conversion units, specifically, the first bridge arm, the first inductor L1, the second bridge arm, and the second inductor L2 form a first full-bridge rectifier/inverter, and the third bridge arm, the third inductor L3, the second bridge arm, and the second inductor L2 form a second full-bridge rectifier/inverter; the first full-bridge rectifier/inverter and the second full-bridge rectifier/inverter can both adopt a unipolar modulation mode, and both use the second bridge arm as a power frequency conduction bridge arm; the third switch S3 and the fourth switch S4 are in power frequency complementary conduction to clamp the first end voltage of the second inductor L2 to one end or the other end potential of the bus capacitor C, the first switch S1 and the second switch S2 are also in high-frequency complementary conduction after being modulated according to sine wave signals, and the first full-bridge rectifier/inverter forms a first bidirectional AC/DC conversion unit; meanwhile, the third switch S3 and the fourth switch S4 are in power frequency complementary conduction to clamp the voltage at one end of the second inductor L2 to the potential at one end or the other end of the bus capacitor C, respectively, the fifth switch S5 and the sixth switch S6 are also in high frequency complementary conduction after being modulated according to sine wave signals, and the second full-bridge rectifier/inverter constitutes a second bidirectional AC/DC conversion unit.
The first full-bridge network 200, the resonant unit 300, and the second full-bridge network 400 form a bidirectional DC/DC conversion unit, and specifically, when the first full-bridge network 200 and the second full-bridge network 400 are modulated in a synchronous modulation mode, the first full-bridge network 200 and the second full-bridge network 400 maintain a synchronous on-time in a high frequency switching cycle, during the on-time, a DC-side voltage of the first full-bridge network 200 is coupled to an input terminal of the resonant unit 300 to form a voltage V1, and a DC-side voltage of the second full-bridge network 400 is coupled to an output terminal of the resonant unit 300 to form a voltage V2, the resonant unit 300 exhibits a certain impedance characteristic due to an inductance element or a combination of an inductance element and a capacitance element, the voltage V1 and the voltage V2 form a certain voltage difference across the resonant unit 300, and the direction of an average current flowing through the resonant unit 300 is determined according to the positive and negative of the voltage difference, the high frequency impedance characteristic of the resonant unit 300 can limit the current from rising rapidly, avoiding current runaway. Specifically, the first full-bridge network 200 and the second full-bridge network 400 are controlled according to a synchronous modulation mode, and during a high-frequency synchronous on-time, the voltage on the dc side of the first full-bridge network 200 coupled to the resonant unit 300 is V1, and the voltage on the dc side of the second full-bridge network 400 coupled to the other side of the resonant unit 300 is V2, provided that the transformation ratio of the transformer TT is N: 1, when V1 is greater than nxv 2, the working state of the first full-bridge network 200 is equivalent to a half-bridge chopping mode, the resonant inductor Lr, the resonant capacitor Cr, the transformer T, and the excitation inductor Lm form an LLC resonant cavity unit to generate a soft switching effect, the working state of the second full-bridge network 400 is equivalent to a full-bridge rectification mode, and the flowing direction of active energy is from the first full-bridge network 200 to the second full-bridge network 400; when V1 is smaller than nxv 2, the working state of the first full-bridge network 200 is equivalent to a voltage-doubling rectification state, the resonant inductor Lr, the resonant capacitor Cr, the transformer T, and the excitation inductor Lm form an LLC resonant cavity unit to generate a soft switching effect, the working state of the second full-bridge network 400 is equivalent to a full-bridge rectification mode, and the flowing direction of active energy is from the second full-bridge network 400 to the first full-bridge network 200.
If the second terminal of the first inductor L1 is connected to the live line of the utility power, the third inductor L3 is connected to the energy feedback type load, the second terminal of the second inductor L2 is connected to the neutral line of the utility power and the energy feedback type load, and the switches S11 to S14 are coupled to a dc energy storage device, such as a battery cell. When the energy feedback type load is instantly loaded, the situation of overpower can occur, and in severe cases, the motor is failed to start, but if the first bidirectional AC/DC conversion unit and the bidirectional DC/DC converter supply power simultaneously, the problem that the system is locally crashed due to instant overpower can be solved. When the mains voltage is lower than the rated voltage, the current of the first bidirectional AC/DC converter is increased, and the efficiency of the system is reduced, and at this time, if the power of the bidirectional DC/DC converter is properly increased, so that the power of the first bidirectional AC/DC converter is reduced, the system can be kept to continuously operate at higher efficiency. When an energy regenerative load is operating in a generator mode, it is desirable to store energy preferentially in the dc energy storage device, and efficient control of power is required. It can be seen that for such a multi-port bidirectional power converter, a new control method needs to be used to solve the problem of uncontrollable power flow.
Based on this, an embodiment of the present invention provides a power supply control method, as shown in fig. 3, including:
s301: calculating the target power of each bidirectional power conversion unit at a direct current bus node;
in particular, the target power may be an instantaneous power at the dc bus node of each bidirectional power conversion unit or an average power at the dc bus node of each bidirectional power conversion unit.
S302: distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power;
s303: and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value.
In a possible implementation manner, the step S301 of determining the target power of each bidirectional power conversion unit at the dc bus node may specifically be performed as the following steps:
s1: collecting a voltage value and a current value of a first end of each bidirectional power conversion unit; specifically, the first end of each bidirectional power conversion unit is an end located at a node of the dc bus, and as shown in fig. 4, a voltage value V at the node of the dc bus is collected busAnd collecting current values I of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit at a direct current bus nodeDC1、IDC2、IDC3。
S2: and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit. Specifically, the voltage value of each bidirectional power conversion unit at the node of the direct current bus is multiplied by the current value, so that the instantaneous power flowing into or out of the direct current bus by each bidirectional power conversion unit can be calculated; in addition, the average power of each bidirectional conversion unit can also be calculated through the voltage value and the current value of each bidirectional power conversion unit at the direct-current bus node. For example, in the AC-DC hybrid power supply system shown in fig. 4, the voltage value V at the DC bus node may be obtained by the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit, and the bidirectional DC/DC unitbusAnd the current values I of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit at the DC bus nodeDC1、IDC2And IDC3And calculating target power of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit at the direct current bus node.
In another possible implementation, the determining the target power of each bidirectional power conversion unit at the dc bus node may specifically be performed as the following steps:
s1': acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit; specifically, as shown in fig. 4, the voltage values V of the second ends of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit, and the bidirectional DC/DC unit may be respectively collectedac1、Vac2、Vdc1And a current value IL1、IL3、IDC4。
S2': and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit. Specifically, the instantaneous power at the second end of each bidirectional power conversion unit can be calculated by multiplying the voltage value and the current value at the second end of each bidirectional power conversion unit, and the instantaneous power at the second end of each bidirectional power conversion unit can be calculated by the voltage value and the current value at the second end of each bidirectional power conversion unitAnd calculating the average power of the second end of each bidirectional power conversion unit. The calculated power of the second end of each bidirectional power conversion unit can be converted into the target power of each bidirectional power conversion unit at the direct-current bus node through efficiency conversion. For example, in the AC-DC hybrid power supply system shown in fig. 4, the voltage value V at the second end of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit can be obtained ac1、Vac2、Vdc1And a current value IL1、IL3、IDC4And calculating the power of the second ends of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit respectively, and then calculating the target power of the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC unit at the direct current bus node respectively through efficiency conversion. Specifically, in the calculation process of the efficiency conversion, the power at the second end of one bidirectional AC/DC conversion unit may be multiplied by the AC-to-DC conversion efficiency of the bidirectional AC/DC conversion unit to obtain the target power, or divided by the DC-to-AC conversion efficiency of the bidirectional AC/DC conversion unit to obtain the target power.
Specifically, step S302 allocates a given power to each of the bidirectional power conversion units according to a preset power allocation scheme based on the target power, as shown in fig. 5, which may be based on a voltage value VbusAnd a current value IDC1、IDC2And IDC3Distributing given power for the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC conversion unit respectively according to a preset power distribution scheme by the three calculated target powers; or based on the voltage value Vac1、Vac2、Vdc1And a current value IL1、IL3、IDC4And distributing given power for the first bidirectional AC/DC conversion unit, the second bidirectional AC/DC conversion unit and the bidirectional DC/DC conversion unit according to a preset power distribution scheme.
The preset power allocation scheme in step S302 may specifically include one or more of the following manners:
the first method is as follows: the given power is not more than the rated power distribution of the bidirectional power conversion unit; specifically, the given power of each bidirectional power conversion unit is distributed according to the rated power of the bidirectional power conversion unit, when the calculated target power of one bidirectional power conversion unit is smaller than the rated power of the bidirectional power conversion unit, the given power of the bidirectional power conversion unit is equal to the calculated target power, and when the calculated target power of one bidirectional power conversion unit exceeds the rated power, the given power of the bidirectional power conversion unit is limited to the rated power. The essence of the power allocation scheme is that the actual power required by the power of each bidirectional power conversion unit is what, the given power is allocated, and if the actual power exceeds the rated power, the given power is limited to the rated power. According to the power distribution scheme, the problem of instantaneous power imbalance is not considered, the response time and the equivalent impedance of each bidirectional power conversion unit are considered to be different, the power imbalance condition exists, but each bidirectional power conversion unit can operate within the rated power, and overpower cannot be caused. When one of the bidirectional power conversion units reaches the rated power, the redundant power flows to the other bidirectional power conversion units.
The second method comprises the following steps: distributing according to a preset power distribution proportion; specifically, when a predetermined condition is satisfied, the given power of each bidirectional power conversion unit may be allocated in a certain ratio. For example, in fig. 4, the second end of the first inductor and the second end of the second inductor are respectively connected to a live line and a neutral line of a commercial power, and it may be set that when a voltage of the commercial power is lower than 10% of a rated voltage, the first bidirectional AC/DC conversion unit and the bidirectional DC/DC conversion unit simultaneously provide power to the second bidirectional AC/DC conversion unit according to a preset ratio, so that it may be avoided that when the commercial power is at a low voltage, the first bidirectional AC/DC conversion unit provides power to the second bidirectional AC/DC conversion unit and needs to provide power to the bidirectional DC/DC conversion unit at the same time, and a situation that the first bidirectional AC/DC conversion unit operates at a low voltage and a large current, and both system efficiency and system reliability are reduced is avoided.
The third method comprises the following steps: distributing in a preset priority order; specifically, when a predetermined condition is satisfied, a specific bidirectional power conversion unit may be selected to preferentially supply power in order of priority, and when an upper limit value of the supplied power is reached, the power is continuously supplied by the bidirectional power conversion unit of lower priority. In one embodiment, when the energy feedback type load coupled to the second bidirectional AC-DC conversion unit operates in a generator state, the bidirectional DC/DC converter may be set to preferentially provide the maximum absorption power, that is, preferentially charge the DC energy storage device, but the charging process is limited by the maximum absorption power of the DC energy storage device, and the excess power is absorbed by the first bidirectional AC/DC conversion unit and fed back to the grid.
For example, in the process of charging a battery, normal charging is divided into two stages of constant-current charging and constant-voltage charging, wherein in the constant-current charging stage, the charging current is constant, the charging voltage gradually rises, the charging voltage is converted into constant-voltage charging after reaching a set value, and the charging current gradually falls in the constant-current charging stage, so that the charging power slowly rises in the constant-current charging stage, the charging power gradually decreases in the constant-voltage charging stage, and the power of a generator may be constant in the constant-voltage charging stage, so that the excessive power is absorbed by the first bidirectional AC/DC converter and fed back to a power grid.
In a possible implementation manner, the step S303 of controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be greater than a preset threshold may specifically be performed as the following steps:
and carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
Specifically, a proportional-integral PI control system includes a power loop controller, a voltage loop controller, and a current loop controller. The closed-loop control process of each bidirectional power conversion unit may specifically be: firstly, calculating target power at a direct current bus node through the acquired voltage value and current value at the direct current bus node, comparing given power with the calculated value of the target power at the direct current bus node, calculating a power error, and sending the power error to a power loop controller for closed-loop regulation to obtain power loop output quantity; then, comparing the output quantity of the power loop with the acquired voltage value, and sending the obtained difference value to a voltage loop controller to obtain the output quantity of the voltage loop; and then comparing the output quantity of the voltage loop with the acquired current value, and sending the obtained difference value to a current loop controller to obtain the output quantity of the current loop. And finally, converting the output quantity of the current loop into a driving signal for regulating the power of the bidirectional power conversion unit. The power loop controller, the voltage loop controller and the current loop controller are PI controllers, the PI controllers comprise amplitude limiting links, and when the output amplitude of the PI controllers exceeds a threshold value, the output values of the PI controllers are limited to the threshold value.
In the closed-loop control of the target power of each bidirectional power conversion unit through the proportional-integral PI control system, the current control is used as an inner loop to play a role in quick response, the voltage control is used as an intermediate loop to keep a voltage control object stable, the voltage loop and current loop double-loop controller can keep each bidirectional power conversion unit to work stably, and the power control is used as an outer loop to adjust the power of each discrete bidirectional power conversion unit so that the power of each bidirectional power conversion unit at a direct-current bus node can operate in a set expectation. By the control strategy, the problems of uncertain paths and power distribution unbalance of the power flow of the multi-port bidirectional power converter can be avoided.
In a specific embodiment, as shown in fig. 4, 5, 6 and 7, for the first bidirectional AC/DC conversion unit, first, the current value I on the DC bus side of the first bidirectional AC/DC conversion unit is collectedDC1Voltage value VbusAnd a voltage value V on the AC sideac1The current value I of the first inductor L1L1Calculating the target power of the first bidirectional AC/DC conversion unit at the direct current bus node, then comparing the given power with the calculated value of the target power at the direct current bus node, calculating the power error, sending the power error to the power loop controller for closed-loop regulation to obtain the output quantity of the power loop, and the output quantity of the power loop and the voltage value V busComparing to obtain a difference value, sending the difference value into a voltage loop controller to obtain a voltage loop output quantity, a voltage loop output quantity and a current value IL1Comparing to obtain a difference value, sending the difference value into a current loop controller to obtain a current loop output quantity, finally converting the current loop output quantity into a PWM (pulse-width modulation) driving signal, and adjusting a given voltage V at a bus capacitor1setAnd in turn, the power at the DC bus node of the first bi-directional AC/DC conversion unit.
Specifically, the driving signals for driving the first bidirectional AC/DC conversion unit include two sets of driving signals, wherein one set of driving signals complementary to each other in power frequency is used for driving the switch S3 and the switch S4, the potential of the zero line is clamped to the positive terminal or the negative terminal of the bus capacitor C in each power frequency period, the other set of driving signals complementary to each other in high frequency is used for driving the switch S1 and the switch S2, the set of driving signals can be modulated according to sine wave signals, and the voltage V at the AC side is stable in the circuit stateac1And the voltage V at the two ends of the DC bus capacitor CbusThe relationship of (1) is: vac1＝D×VbusAnd the duty ratio D is obtained by dividing the on-time Ton of the driving signal by the switching period time T in the high-frequency switching period, namely D equals to Ton/T. In a stable state, the voltage corresponding relation and the current flowing through the first bidirectional AC/DC conversion unit can be changed by changing the opening time Ton of the driving signal in the high-frequency period, so that the power of the first bidirectional AC/DC conversion unit at the direct-current bus node is effectively controlled. If the bi-directional power converter is considered a power valve, then this process amounts to adjusting the size of the power valve.
As shown in fig. 4, 5, and 8, for the second bidirectional AC/DC conversion unit, first, the current value I on the DC bus side of the second bidirectional AC/DC conversion unit is acquiredDC2Voltage value VbusAnd a voltage value V on the AC sideac2A current value I of the third inductor L3L3Calculating the target power of the second bidirectional AC/DC conversion unit at the direct current bus node, then comparing the given power with the calculated value of the target power at the direct current bus node, calculating the power error, sending the power error to the power loop controller for closed-loop regulation to obtain the power loop outputOutput, power loop output and voltage value Vac2Comparing to obtain a difference value, sending the difference value into a voltage loop controller to obtain a voltage loop output quantity, a voltage loop output quantity and a current value IL3Comparing to obtain a difference value, sending the difference value into a current loop controller to obtain a current loop output quantity, finally converting the current loop output quantity into a PWM (pulse-width modulation) driving signal, and adjusting a given value V of an effective value of the voltage at the alternating current side of the second bidirectional AC/DC conversion unit2setAnd in turn, the power at the DC bus node of the second bi-directional AC/DC conversion unit.
Specifically, the driving signals for driving the second bidirectional AC/DC conversion unit include two groups of driving signals, and include a group of driving signals with complementary power frequencies for driving the switch S3 and the switch S4, and in each power frequency cycle, the potential of the zero line is clamped to the positive end or the negative end of the bus capacitor C, and the first AC/DC conversion unit and the second AC/DC conversion unit provide a common power frequency bridge arm, so as to create a bipolar condition. Another set of high frequency complementary drive signals is used to drive switch S5 and switch S6, which are also modulated in accordance with a sine wave signal, the same adjustment mechanism as the high frequency complementary drive signals used to drive switch S1 and switch S2.
As shown in fig. 4, 5, and 9, first, a current value I on the DC bus side of the bidirectional DC/DC conversion unit is acquiredDC3Voltage value VbusAnd the side voltage value V of the direct current energy storage devicedc1Current value IDC4Calculating the target power of the bidirectional DC/DC conversion unit at the node of the direct current bus, then comparing the given power with the calculated value of the target power, calculating the power error, sending the power error to the power loop controller for closed-loop regulation to obtain the output quantity of the power loop, and the output quantity of the power loop and the voltage value Vdc1Comparing to obtain a difference value, sending the difference value into a voltage loop controller to obtain a voltage loop output quantity, a voltage loop output quantity and a current value IDC4Comparing to obtain a difference value, sending the difference value into a current loop controller to obtain a current loop output quantity, finally converting the current loop output quantity into a PWM (pulse width modulation) driving signal, and adjusting a direct current voltage value V of the bidirectional DC/DC conversion unit on the direct current energy storage device side3setFurther adjust the bidirectional DC/DC conversion unit to be in the on-line statePower at the flow bus node.
Specifically, the driving signals for driving the bidirectional DC/DC conversion unit include a set of high-frequency complementary driving signals, one of which drives switch S7, switch S10, switch S11 and switch S14, and the complementary signals drive switch S8, switch S9, switch S12 and switch S13. When one drive is switched on, the voltage on the direct current bus side is coupled to one end of the LLC resonant cavity through the switch S7 and the switch S10, and the direct current voltage on the direct current energy storage side is coupled to the other end of the LLC resonant cavity through the switch S11 and the switch S14; when the complementary drive is switched on, the voltage on the direct current bus side is coupled to one end of the LLC resonant cavity through the switch S8 and the switch S9, and the direct current voltage on the direct current energy storage side is coupled to the other end of the LLC resonant cavity through the switch S12 and the switch S13; under the high-frequency switching state, the LLC resonant cavity presents certain impedance characteristics, and the voltage difference between two ends of the LLC resonant cavity is divided by the impedance of the LLC resonant cavity to obtain the current of the resonant cavity; in a stable state of the circuit, the corresponding relation of the voltage and the current flowing through the bidirectional DC/DC conversion unit can be changed by changing the opening time Ton of the driving signal in a high-frequency period, so that the power of the bidirectional DC/DC conversion unit is effectively controlled.
The power supply control method provided by the embodiment of the invention comprises the steps of calculating the target power of each bidirectional power conversion unit at a direct current bus node; distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power; and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value. In the control method, an alternating current-direct current hybrid power supply system consisting of a plurality of bidirectional power conversion units is regarded as an energy pipeline system, each bidirectional power conversion unit is regarded as a power valve of the energy pipeline system, given power of each bidirectional power conversion unit at a direct current bus node is distributed according to a preset power distribution scheme, the absolute value of the difference value between the power of each bidirectional power conversion unit and the given power is controlled not to be larger than a preset threshold value, energy at the direct current bus node is dispatched in a centralized mode, the problem that part of the bidirectional power conversion units in the alternating current-direct current hybrid power supply system are overloaded or power is not distributed according to expectation can be solved, and the problem that the power of the multi-port hybrid power supply system flows out of uncertain paths and the power distribution is unbalanced can be avoided.
Based on the same inventive concept, an embodiment of the present invention further provides a power supply control device, where specific implementation of the power supply control device may refer to related description of the above method, and repeated details are not repeated, as shown in fig. 10, which is a schematic structural diagram of the power supply control device provided in the embodiment of the present invention, and the power supply control device mainly includes:
a calculation module 101, operable to calculate a target power at a dc bus node for each of the bidirectional power conversion units;
a power allocation module 102, configured to allocate a given power to each bidirectional power conversion unit according to a preset power allocation scheme based on the target power;
the control module 103 is configured to control an absolute value of a difference between the power of each of the bidirectional power conversion units and the given power to be not greater than a preset threshold.
In a possible implementation, the computing module 101 is specifically configured to:
collecting a voltage value and a current value of a first end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit.
In a possible implementation, the computing module 101 is specifically configured to:
acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit.
In one possible embodiment, the preset power allocation scheme includes one or more of the following:
the given power is not more than the rated power distribution of the bidirectional power conversion unit;
distributing according to a preset power distribution proportion;
are assigned in a preset priority order.
In a possible implementation, the control module 103 is specifically configured to: and carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
The embodiment of the invention provides a power supply control device, which can calculate the target power of each bidirectional power conversion unit at a direct current bus node, allocate given power to each bidirectional power conversion unit according to a preset power allocation scheme based on the target power, and control the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold. In the power supply control device, an alternating current and direct current hybrid power supply system composed of a plurality of bidirectional power conversion units is regarded as an energy pipeline system, each bidirectional power conversion unit is regarded as a power valve of the energy pipeline system, given power of each bidirectional power conversion unit at a direct current bus node is distributed according to a preset power distribution scheme, the absolute value of the difference value between the power of each bidirectional power conversion unit and the given power is controlled not to be larger than a preset threshold value, energy at the direct current bus node is dispatched in a centralized mode, the problem that overload occurs or power is not distributed according to expectation in part of the bidirectional power conversion units in the alternating current and direct current hybrid power supply system can be solved, and the problem that uncertain paths and power distribution imbalance occur in power outflow of the multi-port hybrid power supply system can be avoided.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A power supply control method is applied to an alternating current and direct current hybrid power supply system, the system comprises a plurality of bidirectional power conversion units and a direct current bus, first ends of the bidirectional power conversion units are connected to the direct current bus, second ends of the bidirectional power converters are connected with different power supplies, and the control method comprises the following steps:
calculating the target power of each bidirectional power conversion unit at a direct current bus node;
distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power;
and controlling the absolute value of the difference between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value.
2. The method of claim 1, wherein the determining the target power of each of the bidirectional power conversion units at a dc bus node comprises:
Collecting a voltage value and a current value of a first end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit.
3. The method of claim 1, wherein the determining the target power of each of the bidirectional power conversion units at a dc bus node comprises:
acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit.
4. The method of claim 1, wherein the preset power allocation scheme comprises one or more of:
the given power is not more than the rated power distribution of the bidirectional power conversion unit;
distributing according to a preset power distribution proportion;
are assigned in a preset priority order.
5. The method of claim 1, wherein the controlling that an absolute value of a difference between the power of each of the bidirectional power conversion units and a given power is not greater than a preset threshold comprises:
And carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
6. A power supply control device characterized by comprising:
the calculation module is used for calculating the target power of each bidirectional power conversion unit at a direct current bus node;
the power distribution module is used for distributing given power to each bidirectional power conversion unit according to a preset power distribution scheme based on the target power;
and the control module is used for controlling the absolute value of the difference value between the power of each bidirectional power conversion unit and the given power not to be larger than a preset threshold value.
7. The apparatus of claim 6, wherein the computing module is specifically configured to:
collecting a voltage value and a current value of a first end of each bidirectional power conversion unit;
and calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the first end of each bidirectional power conversion unit.
8. The apparatus of claim 6, wherein the computing module is specifically configured to:
acquiring a voltage value and a current value of a second end of each bidirectional power conversion unit;
And calculating the target power of each bidirectional power conversion unit at the direct current bus node based on the voltage value and the current value of the second end of each bidirectional power conversion unit.
9. The apparatus of claim 6, wherein the preset power allocation scheme comprises one or more of:
the given power is not more than the rated power distribution of the bidirectional power conversion unit;
distributing according to a preset power distribution proportion;
are assigned in a preset priority order.
10. The apparatus of claim 6, wherein the control module is specifically configured to: and carrying out closed-loop control on the power of each bidirectional power conversion unit through a proportional-integral (PI) control system.
11. An electronic device, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory and for executing the steps comprised by the method of any one of claims 1 to 5 in accordance with the obtained program instructions.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions which, when executed by a computer, cause the computer to carry out the steps comprised by the method according to any one of claims 1-5.
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