CN116526440A - High-voltage energy storage active power decoupling circuit of electrolytic capacitor-free driving system - Google Patents
High-voltage energy storage active power decoupling circuit of electrolytic capacitor-free driving system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 23
- 230000010349 pulsation Effects 0.000 claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 142
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- 238000003908 quality control method Methods 0.000 abstract description 3
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- 238000011217 control strategy Methods 0.000 description 4
- 239000010409 thin film Substances 0.000 description 3
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Classifications
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a high-voltage energy storage active power decoupling circuit of an electrolytic capacitor-free driving system, wherein the input end of a rectifying circuit unit is connected with a power grid, the positive electrode of the output end of the rectifying circuit is connected with the positive electrode of the input end of a PFC unit, and the negative electrode of the output end of the rectifying circuit is connected with the negative electrode of the input end of the PFC unit; the positive electrode of the output end of the PFC unit is connected with the positive electrode of the input end of the active power decoupling circuit, and the negative electrode of the output end of the PFC unit is connected with the negative electrode of the input end of the active power decoupling circuit; the positive electrode of the output end of the active power decoupling circuit is connected with the positive electrode of the direct current bus, and the negative electrode of the output end of the active power decoupling circuit is connected with the negative electrode of the direct current bus; the positive electrode of the input end of the motor three-phase inverter is connected with the positive electrode of the direct current bus, and the output end of the three-phase inverter is connected with the PMSM three-phase winding of the permanent magnet synchronous motor. The invention realizes the mutual independence of the power quality control of the power grid and the voltage pulsation suppression control of the direct current bus, and reduces the design difficulty of the controller.
Description
Technical Field
The invention relates to design and control of a power converter topology of a motor driving system without electrolytic capacitors, in particular to an active power decoupling circuit structure and bus voltage pulsation suppression, and belongs to the technical field of power electronics.
Background
The permanent magnet synchronous motor has simple structure, high power density and efficiency, and is widely used in the fields of industrial production, transportation, daily life and the like. In order to realize high-performance operation of the permanent magnet motor, a DC bus of a traditional motor driving system needs to be connected with an electrolytic capacitor with a large capacity value in parallel to absorb pulsating power of a power grid and maintain the stability of the voltage of the DC bus. However, electrolytic capacitors have short life and poor thermal stability, and are a major cause of frequent failure of the drive system.
The electrolytic capacitor-free driving system adopts a thin film capacitor to replace a large-capacity electrolytic capacitor, and the reliability of the driving system is obviously improved. However, due to cost and volume constraints, the capacity of the thin film capacitor is only 0.1-0.2 times that of the electrolytic capacitor of the traditional driving system. Practice shows that the technical means of directly replacing the large-capacity electrolytic capacitor by the small-capacity film capacitor cannot effectively absorb the power grid pulsating power, and the direct current bus has the double power grid frequency pulsating voltage with larger amplitude, so that the input power quality and the motor performance of the driving system are deteriorated. More serious, under the dynamic working condition, the input power of the driving system lags behind the power change of the motor, so that the pulsation of the bus voltage of the electrolytic capacitor-free driving system is further increased, the motor performance is rapidly reduced, and even the electrolytic capacitor-free driving system cannot work normally when the motor performance is serious.
The active power decoupling circuit is an effective means for overcoming the problems, and the active power decoupling circuit realizes the ordered control of the power grid pulsating power by controlling the energy flow between the low-capacity film power decoupling capacitor in the decoupling circuit and the direct-current bus film capacitor of the electrolytic capacitor-free driving system, thereby achieving the aim of suppressing the bus voltage pulsation of the electrolytic capacitor-free driving system, and being one of the research hot spot directions in the field of the current motor driving system. However, the power coupling between the power decoupling capacitor and the direct current bus film capacitor of the existing active power decoupling circuit is tight, the control difficulty is high, and the bus voltage pulsation suppression effect is limited. In addition, the active power decoupling circuit has more power devices and passive devices, the cost and the volume of the electrolytic capacitor-free driving system are difficult to further reduce, and the popularization and the application of the electrolytic capacitor-free driving system are limited.
Disclosure of Invention
Aiming at the problems of low power density, tight power coupling and the like of the traditional active power decoupling circuit, the invention provides the active power decoupling circuit with a high-voltage energy storage capacitor and complete decoupling of pulsating power. The decoupling circuit constructs two independent energy flow paths, realizes complete decoupling of pulsating power between the power decoupling capacitor and the direct current bus capacitor, effectively inhibits voltage fluctuation of the direct current bus, and greatly improves dynamic performance of the motor. Meanwhile, compared with similar circuits, the invention can effectively reduce the current harmonic wave of the power grid and realize the remarkable improvement of the comprehensive performance of the motor driving system. In addition, the high-voltage gain characteristic of the active power decoupling circuit greatly improves the working voltage of the pulsating power decoupling capacitor, effectively improves the energy storage density of the unit capacitor, and obviously reduces the capacitance value and the volume of the electroless capacitor.
The invention adopts the following technical scheme to realize the aim:
a novel high-voltage energy storage active power decoupling circuit forms a permanent magnet synchronous motor non-electrolytic capacitor driving system together with a diode single-phase uncontrolled rectifying circuit, a PFC converter, a motor three-phase inverter and a Permanent Magnet Synchronous Motor (PMSM). The input end of the rectifying circuit unit is connected with a power grid, the positive electrode of the output end of the rectifying circuit unit is connected with the positive electrode of the input end of the PFC unit, and the negative electrode of the output end of the rectifying circuit unit is connected with the negative electrode of the input end of the PFC unit; the positive electrode of the output end of the PFC unit is connected with the positive electrode of the input end of the active power decoupling circuit, and the negative electrode of the output end of the PFC unit is connected with the negative electrode of the input end of the active power decoupling circuit; the positive electrode of the output end of the active power decoupling circuit is connected with the positive electrode of the direct current bus, and the negative electrode of the output end of the active power decoupling circuit is connected with the negative electrode of the direct current bus; the positive pole of the input end of the three-phase inverter of the motor is connected with the positive pole of the direct current bus, the negative pole of the input end of the three-phase inverter is connected with the negative pole of the direct current bus, and the output end of the three-phase inverter is connected with a Permanent Magnet Synchronous Motor (PMSM) three-phase winding; the voltage across the first capacitor (C1) is defined as the dc bus voltage.
The rectification circuit unit is a single-phase rectification circuit formed by diodes D1-D4; the PFC unit is constructed based on a Boost circuit and consists of a first inductor (L1), a first switching tube (S1) and a fifth diode (D5); the high-voltage energy storage active power decoupling circuit consists of a second inductor (L2), a first capacitor (C1), a second capacitor (C2), a second switching tube (S2) and a third switching tube (S3); the three-phase motor inverter is composed of power devices T1-T6;
the output positive electrode of the rectifying circuit unit is connected with one end of a first inductor (L1), and the output negative electrode of the rectifying unit is simultaneously connected with the source electrode of a first switching tube (S1), the source electrode of a second switching tube (S2), the negative electrode of a first capacitor (C1) and the input negative electrode of a three-phase inverter bridge; the drain electrode of the first switching tube (S1) is connected with the other end of the first inductor (L1) and the anode of the fifth diode (D5); the positive electrode of the first capacitor (C1) is connected with the cathode of the fifth diode (D5), one end of the second inductor (L2), the negative electrode of the second capacitor (C2) and the input positive electrode of the three-phase inverter bridge; the drain electrode of the second switching tube (S2) is connected with the other end of the second inductor (L2) and the source electrode of the third switching tube (S3); the drain electrode of the third switching tube (S3) is connected with the positive electrode of the second capacitor (C2); the cathode of the second capacitor (C2) is connected with the cathode of the fifth diode (D5), the anode of the first capacitor (C1), one end of the second inductor (L2) and the positive end of the three-phase motor inverter.
The active power decoupling circuit disclosed by the invention constructs two completely independent energy flow paths, so that independent control of power grid pulsating power, direct current bus power and decoupling capacitor power is realized, the influence of the direct current bus voltage by the power grid pulsating power is effectively avoided, and effective suppression of bus voltage pulsation under the condition of no electrolytic capacitor is realized. Furthermore, the high-voltage gain characteristic of the active power decoupling circuit realizes that the working voltage of the power decoupling capacitor is greatly improved, the energy storage density of the unit capacitor is effectively improved, and the capacitance and the volume of the power decoupling capacitor are obviously reduced.
In the PFC converter of the electrolytic capacitor-free driving system, a first switching tube (S1) controls the input current of the driving system to change along with the voltage phase of a power grid, and the driving system achieves the control targets of high power factor and low current harmonic waves.
In the active power decoupling circuit of the electrolytic capacitor-free driving system, a second switching tube (S2) and a third switching tube (S3) are switched on or off according to errors of actual values and given values of direct current bus voltage, and a second inductor (L2) is used as an energy transfer device to realize transfer and control of pulse energy between a first capacitor (C1) and a second capacitor (C2). The second inductor (L2) is designed to work in a current interruption mode, so that the complete decoupling of the pulse energy between the first capacitor (C1) and the second capacitor (C2) is realized, the design of the controller is simplified, and the pulse of the voltage of the direct current bus is effectively reduced.
When the second switching tube (S2) works in a chopping state and the third switching tube (S3) works in an off state, the active power decoupling circuit of the electrolytic capacitor-free driving system can be regarded as a boost circuit taking the first capacitor (C1) as an input power supply and the second capacitor (C2) as a load. Therefore, the voltage of the second capacitor (C2) is far higher than the peak voltage of the power grid, and the energy storage density of the unit capacitor of the second capacitor (C2) is improved. In addition, in the bus voltage ripple suppression control process, the first capacitor (C1) and the second capacitor (C2) can flow alternately, and the current direction of the corresponding second inductor (L2) is changed alternately. Because the inductance current cannot be suddenly changed, the second inductance (L2) is designed to work in a current interruption mode, and energy control decoupling of the first capacitance (C1) and the second capacitance (C2) is realized.
PFC unit control: the first switching tube (S1) works in a chopping state, and the power grid current is tracked to the power grid voltage change by controlling the charge and discharge of the first inductor (L1), so that the low harmonic requirement of a driving system is met. The specific method comprises the following steps: when the power grid outputsCurrent i g Less than the reference current i g * When the first switch tube (S1) is conducted, the current of the first inductor (L1) rises; when the power grid outputs current i g Greater than reference current i g * When the first switching tube (S1) is turned off, the first inductance (L1) is lowered. And through the on and off of the first switching tube (S1), the unit power factor of the power grid current and the low-current harmonic operation are realized.
Dc bus voltage ripple suppression control: the active power decoupling circuit is used for suppressing direct current bus voltage ripple suppression, wherein the switching states of the second switching tube (S2) and the third switching tube (S3) are only related to the voltage of the first capacitor (C1) and the set voltage error and the set threshold value of the direct current bus, and are not related to the state of the first switching tube (S1) in the PFC converter.
When the direct current bus voltage u at the two ends of the first capacitor (C1) DC When the voltage is larger than the set voltage, the second switching tube (S2) works in a chopping state, and the third switching tube (S3) is in an off state: when the second switching tube (S2) is turned on, the energy of the first capacitor (C1) is stored in the second inductor (L2) through the second switching tube (S2). When the second switching tube (S2) is turned off, the second inductor (L2) releases energy to the second capacitor (C2) through the anti-parallel diode of the third switching tube (S3), and the voltage of the second capacitor (C2) rises correspondingly, and the current of the second inductor (L2) is reduced. This phase is until the voltage of the first capacitor (C1) is lower than the set value.
When the direct current bus voltage u at the two ends of the first capacitor (C1) DC When the voltage is smaller than the set voltage, the second switching tube (S2) works in an off state, and the third switching tube (S3) works in a chopping state: when the third switching tube (S3) is turned on, the energy of the second capacitor (C2) is stored in the second inductor (L2) through the third switching tube (S3). When the third switching tube (S3) is turned off, the second inductor (L2) releases energy to the first capacitor (C1) through the anti-parallel diode of the second switching tube (S2), and the voltage of the first capacitor (C1) rises correspondingly, and the current of the second inductor (L2) is reduced. This phase is until the voltage of the first capacitor (C1) is lower than the set value.
The technical effects of the invention after the technical scheme is adopted are as follows:
(1) The active power decoupling circuit provided by the invention is provided with two independent energy flow paths, so that the pulsating power absorption and release among the power grid, the power decoupling capacitor and the direct current bus capacitor are completely independent, the direct current bus voltage pulsation is effectively inhibited, and the high-performance operation of the motor driving system under each working condition is realized.
(2) The active power decoupling circuit provided by the invention has a simple and reliable structure, realizes mutual independence of power quality control of a power grid and voltage pulsation suppression control of a direct current bus, and reduces the design difficulty of a controller. On the premise of ensuring the control effect of the system, the system has higher control freedom.
(3) The unique performance of the structure and the principle of the invention improves the working voltage of the pulse power decoupling capacitor, effectively improves the energy storage density of the unit capacitor and reduces the capacitance value and the volume of the capacitor.
Drawings
FIG. 1 is a schematic diagram of a novel power decoupling circuit based electrolytic capacitor-less driving system according to the present invention;
fig. 2 is a schematic diagram of the rectifier circuit+pfc circuit of fig. 1 when the first switching tube (S1) is turned off;
fig. 3 is a schematic diagram of the rectifier circuit+pfc circuit of fig. 1 when the first switching tube (S1) is turned on;
fig. 4 is a schematic diagram of the active power decoupling circuit in fig. 1 when the second switching tube (S2) is turned on and the third switching tube (S3) is turned off;
fig. 5 is a schematic diagram of the active power decoupling circuit in fig. 1 when the second switching tube (S2) is turned off and the third switching tube (S3) is turned off;
fig. 6 is a schematic diagram of the active power decoupling circuit in fig. 1 when the second switching tube (S2) is turned off and the third switching tube (S3) is turned on;
fig. 7 is a schematic diagram of the active power decoupling circuit in fig. 1 when the second switching tube (S2) is turned off and the third switching tube (S3) is turned off;
fig. 8 is a control strategy block diagram of an active power decoupling circuit according to the present invention:
(a) Grid current and power factor correction control strategies;
(b) A DC bus voltage ripple suppression control strategy;
table 1 is active power decoupling circuit power device control logic as proposed by the present invention.
Detailed Description
The following is a detailed description of the specific technical scheme of the present invention with reference to examples, drawings and tables:
the invention provides a high-voltage energy storage active power decoupling circuit. The circuit is composed of two power devices, two small-capacity film capacitors and an inductor. The characteristic is that: the power between the decoupling capacitor and the direct-current bus capacitor is completely decoupled, and the voltage pulsation value of the direct-current bus is further reduced on the basis that the power quality of the electrolytic capacitor-free driving system meets relevant standards, so that the electrolytic capacitor-free driving system can operate with high performance under dynamic working conditions; the high-voltage gain characteristic of the circuit further reduces the capacity of the decoupling capacitor by improving the working voltage of the decoupling capacitor, reduces the cost and the volume of the non-electrolytic capacitor driving system, and is beneficial to popularization and application of the non-electrolytic capacitor driving system based on the invention.
The power converter of the electrolytic capacitor-free driving system for the permanent magnet synchronous motor is composed of a rectifying circuit, a PFC unit A, a novel active power decoupling circuit B and a three-phase inverter unit C, and is shown in the figure 1. The input ends of the rectifying circuit and the PFC unit A are connected with a power grid, and the output positive electrode of the rectifying circuit and the PFC unit A are connected with one end of a second inductor (L2), the negative electrode of a second capacitor (C2), the positive electrode of a first capacitor (C1) and the positive electrode of the input end of a three-phase inverter bridge; the output cathode of the rectifying circuit and the PFC unit A are simultaneously connected with the source electrode of the second switch (S2), the cathode of the first capacitor (C1) and the input terminal cathode of the three-phase inverter bridge; the drain electrode of the second switching tube (S2) is connected with one end of the second inductor (L2) and the source electrode of the third switching tube (S3); the drain electrode of the third switching tube (S3) is connected with the positive electrode of the second capacitor (C2); the positive electrode of the first capacitor (C1) is connected with the cathode of the fifth diode (D5), the other end of the second inductor (L2), the negative electrode of the second capacitor (C2) and the positive electrode of the input end of the three-phase inverter bridge; the output end of the three-phase inverter C is connected with the three-phase winding of the permanent magnet synchronous motor.
The main control targets of the high-voltage energy storage and full pulsating power decoupling active power decoupling circuit are as follows: controlling the power grid current to track the power grid voltage phase change, and controlling the input power quality of the driving system to meet IEC61000-3-2 harmonic wave and power factor requirements; and the voltage pulsation of the direct current bus is restrained, and the high-performance operation of the motor under the steady-state and dynamic working conditions is realized. The specific implementation process of the invention is as follows:
the first realization step of the control target is as follows: and a direct-current bus voltage outer ring and a power grid current inner ring double closed-loop control strategy are adopted. The specific implementation process comprises the following steps: and sampling and obtaining the average voltage of the direct current bus after an average filtering algorithm, obtaining the average value of the power grid current by a PI controller with a given value error, and obtaining the power grid reference working current by further multiplying the power grid current with the phase of the power grid. The power grid reference current and the feedback current error of the first inductor (L1) generate a modulation signal through a PI controller, and the modulation signal is compared with a high-frequency triangular carrier wave to generate a control signal of the first switching tube (S1). When the first switching tube (S1) is turned on, the current of the first inductor (L1) increases, and when the first switching tube (S1) is turned off, the current of the first inductor (L1) decreases. The first switching tube (S1) is used for controlling the current tracking reference value of the power grid, so that the input power quality of the electrolytic capacitor-free driving system and the average voltage control of the direct current bus are realized, and the control is shown in tables 1, 2, 3 and 8 (a).
TABLE 1
The second control target implementation step is: and controlling the second switching tube (S2) and the third switching tube (S3) to act according to the errors of the set value and the actual value of the DC bus voltage, so as to realize decoupling of the pulsating power and inhibit the DC bus voltage pulsation. Because the active power decoupling circuit and the first capacitor (C1) are completely decoupled in power, the on or off of the first switching tube (S1) does not affect the working state of the later-stage circuit, the working state of the first switching tube (S1) is ignored when the working principle of the active power decoupling circuit is analyzed, and the working states and control flows of the second switching tube (S2) and the third switching tube (S3) of the active power decoupling circuit are shown in the accompanying figures 4-8. According to the on-off states of the two switching tubes (S2) and the third switching tube (S3), the active power decoupling circuit has four working modes, as shown in the table 1.
State one: the voltage of the first capacitor (C1) is larger than the set DC bus voltage. The second switching tube (S2) works in a chopping state, and the third switching tube (S3) is always turned off. When the second switch tube (S2) is conducted, the first capacitor (C1) supplies energy to the second inductor (L2) and the permanent magnet synchronous motor simultaneously, the current of the second inductor (L2) is increased, and the voltage of the first capacitor (C1) is reduced, as shown in figure 4.
When the second switching tube (S2) is turned off, the second inductor (L2) discharges to the second capacitor (C2) through the third switching tube (S3) anti-parallel diode, the voltage of the second capacitor (C2) increases, the first capacitor (C1) stops supplying energy to the second inductor (L2), the energy is continuously supplied to the motor, and the voltage of the first capacitor (C1) continuously decreases, as shown in figure 5. This state is ended until the voltage of the first capacitor (C1) is lower than the set DC bus voltage.
State two: the voltage of the first capacitor (C1) is smaller than the set DC bus voltage. In this state, the second switching tube (S2) is always turned off, and the third switching tube (S3) operates in the chopping state. When the third switching tube (S3) is conducted, the second capacitor (C2) supplies energy to the second inductor (L2) through the third switching tube (S3), and the voltage of the second capacitor (C2) is reduced. At this time, the first capacitor (C1) jointly provides energy to the permanent magnet synchronous motor through the three-phase inverter, and the voltage of the first capacitor (C1) is reduced, as shown in fig. 6.
When the third switching tube (S3) is turned off, the second capacitor (C2) stops outputting energy, and the voltage of the second capacitor (C2) is kept unchanged. Meanwhile, the second inductor (L2) supplies power to the first capacitor (C1) through the second switching tube (S2) anti-parallel diode, the current of the second inductor (L2) is reduced, and the voltage of the first capacitor (C1) is increased. At this time, the first capacitor (C1) and the second inductor (L2) are connected in parallel and jointly provide energy for the permanent magnet synchronous motor through the three-phase inverter, as shown in fig. 7. And in the second state, until the voltage of the first capacitor (C1) is higher than the set DC bus voltage.
When the first and second states work, the current direction of the second inductor (L2) is opposite. In the control process of suppressing bus voltage pulsation, the circuit is frequently switched in the working state. Because the current direction of the inductor cannot be suddenly changed, in order to not influence the switching of two working states and improve the dynamic response capability of the active power decoupling circuit, the second inductor (L2) is designed to work in a current interruption state, so that the complete decoupling of the first state and the second state is realized, and the voltage pulsation suppression effect of the first capacitor (C1) is ensured.
In the above process, the active power decoupling circuit may be regarded as a boost circuit when the first capacitor (C1) transfers energy to the second capacitor (C2). Therefore, the voltage of the second capacitor (C2) is higher than that of the first capacitor (C1), and the high-voltage work of the second capacitor (C2) is realized because the voltage of the first capacitor (C1) is higher than the peak voltage of the power grid, so that the energy storage capacity of the second capacitor (C2) is greatly improved.
In summary, the novel active power decoupling circuit adopts the high-reliability small-capacity thin film capacitor to replace the traditional large-capacity electrolytic capacitor to realize system power decoupling, thereby remarkably improving the reliability and the service life of the motor driving system. The power decoupling circuit greatly improves the working voltage of the pulsating power decoupling capacitor, effectively improves the energy storage density of the unit capacitor, and greatly reduces the capacitance and the volume of the electroless capacitor. Meanwhile, the active power decoupling circuit constructs two independent energy flow paths, so that decoupling of the pulsating power of the decoupling capacitor and the DC bus capacitor is realized, the DC bus voltage pulsation is effectively restrained, and the high-performance operation of the motor driving system under steady-state and dynamic working conditions is realized. In addition, the power decoupling of the active power decoupling circuit and the power quality control strategy of the power grid of the driving system are mutually independent, so that the design difficulty of the controller is effectively reduced.
Claims (9)
1. A high-voltage energy storage active power decoupling circuit of an electrolytic capacitor-free driving system is characterized in that: the power supply comprises a rectifying circuit, a PFC unit, an active power decoupling circuit and a motor three-phase inverter which are sequentially connected; the input end of the rectifying circuit unit is connected with a power grid, the positive electrode of the output end of the rectifying circuit unit is connected with the positive electrode of the input end of the PFC unit, and the negative electrode of the output end of the rectifying circuit unit is connected with the negative electrode of the input end of the PFC unit; the positive electrode of the output end of the PFC unit is connected with the positive electrode of the input end of the active power decoupling circuit, and the negative electrode of the output end of the PFC unit is connected with the negative electrode of the input end of the active power decoupling circuit; the positive electrode of the output end of the active power decoupling circuit is connected with the positive electrode of the direct current bus, and the negative electrode of the output end of the active power decoupling circuit is connected with the negative electrode of the direct current bus; the positive electrode of the input end of the three-phase inverter of the motor is connected with the positive electrode of the direct current bus, the negative electrode of the input end of the three-phase inverter is connected with the negative electrode of the direct current bus, and the output end of the three-phase inverter is connected with the PMSM three-phase winding of the permanent magnet synchronous motor; the voltage across the first capacitor (C1) is defined as the dc bus voltage.
2. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: the rectification circuit unit is a single-phase rectification circuit formed by diodes D1-D4; the PFC unit consists of a first inductor (L1), a first switching tube (S1) and a fifth diode (D5), wherein the first switching tube (S1) is connected between the first inductor (L1) and the fifth diode (D5); the active power decoupling circuit consists of a second inductor (L2), a first capacitor (C1), a second capacitor (C2), a second switching tube (S2) and a third switching tube (S3); the three-phase motor inverter is composed of power devices T1-T6;
the output positive electrode of the rectifying circuit unit is connected with one end of a first inductor (L1), and the output negative electrode of the rectifying unit is simultaneously connected with the source electrode of a first switching tube (S1), the source electrode of a second switching tube (S2), the negative electrode of a first capacitor (C1) and the input negative electrode of a three-phase inverter bridge; the drain electrode of the first switching tube (S1) is connected with the other end of the first inductor (L1) and the anode of the fifth diode (D5); the positive electrode of the first capacitor (C1) is connected with the cathode of the fifth diode (D5), one end of the second inductor (L2), the negative electrode of the second capacitor (C2) and the input positive electrode of the three-phase inverter bridge; the drain electrode of the second switching tube (S2) is connected with the other end of the second inductor (L2) and the source electrode of the third switching tube (S3); the drain electrode of the third switching tube (S3) is connected with the positive electrode of the second capacitor (C2); the cathode of the second capacitor (C2) is connected with the cathode of the fifth diode (D5), the anode of the first capacitor (C1), one end of the second inductor (L2) and the positive end of the three-phase motor inverter.
3. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: in the rectifying circuit and the PFC unit, a first switching tube (S1) controls the input current of the driving system to change along with the voltage phase of the power grid, so that the purposes of high power factor and low current harmonic control of the driving system are achieved, and meanwhile, the first switching tube (S1) controls the voltage of the direct current bus through the duty ratio.
4. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: the first switching tube (S1) works in a chopping state, the power grid current is tracked to the power grid voltage phase change by controlling the charge and discharge of the first inductor (L1), and the driving system meets the related standard harmonic requirement: when the power grid outputs current i g Less than the reference current i g * When the first switch tube (S1) is conducted, the current of the first inductor (L1) rises; when the power grid outputs current i g Greater than reference current i g * When the first switching tube (S1) is turned off, the first inductance (L1) is lowered.
5. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: according to the error between the actual voltage and the set voltage of the first capacitor (C1), the working states of the second switching tube (S2) and the third switching tube (S3) are controlled, and the energy transfer between the first capacitor (C1) and the second capacitor (C2) is realized by using the second inductor (L2), so that the bus voltage pulsation is controlled.
6. The high voltage energy storage active power decoupling circuit of claim 5, wherein: when the voltage of the direct current bus is higher than a set value, the second switching tube (S2) works in a chopping state, and the third switching tube (S3) is turned off; when the second switching tube (S2) is conducted, the energy of the first capacitor (C1) is stored in the second inductor (L2), the voltage of the first capacitor (C1) is reduced, and the current of the second inductor (L2) is increased; when the second switching tube (S2) is turned off, the energy stored in the second inductor (L2) is stored in the second capacitor (C2) through the anti-parallel diode of the third switching tube (S3), the voltage of the second capacitor (C2) is increased, and the current of the second inductor (L2) is reduced.
7. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: when the voltage of the direct current bus is lower than a set value, the second switching tube (S2) works in an off state, and the third switching tube (S3) works in a chopping state; when the third switching tube (S3) is turned on, the energy of the second capacitor (C2) is stored in the second inductor (L2), the voltage of the second capacitor (C2) is reduced, and the current of the second inductor (L2) is increased; when the third switching tube (S3) is turned off, the energy stored in the second inductor (L2) is stored in the first capacitor (C1) through the anti-parallel diode of the second switching tube (S2), the voltage of the first capacitor (C1) is increased, and the current of the second inductor (L2) is reduced.
8. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: the on or off of the first switching tube (S1) can not influence the working states of the second switching tube (S2) and the third switching tube (S3), and the electric energy quality of a power grid and the control decoupling of the voltage of the direct current bus are realized.
9. The high voltage energy storage active power decoupling circuit of an electrolytic capacitor less driving system of claim 1, wherein: when the second switching tube (S2) works in a chopping state and the third switching tube (S3) works in a closing state, the active power decoupling circuit can be regarded as a boost circuit taking the first capacitor (C1) as an input power source and the second capacitor (C2) as a load, and the voltage of the second capacitor (C2) is far higher than that of the first capacitor (C1); the high voltage of the circuit is as follows: the second inductor (L2) is designed to work in a current interruption mode, the working voltage of the second capacitor (C2) is further improved by utilizing the characteristics of the second inductor, the capacitance of the second capacitor (C2) is effectively reduced, and the power density of the active power decoupling circuit is improved.
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| CN117175957A (en) * | 2023-11-02 | 2023-12-05 | 宁波明禾新能源科技有限公司 | Converter, control method of converter and photovoltaic energy storage charging system |
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| CN117175957A (en) * | 2023-11-02 | 2023-12-05 | 宁波明禾新能源科技有限公司 | Converter, control method of converter and photovoltaic energy storage charging system |
| CN117175957B (en) * | 2023-11-02 | 2024-01-26 | 宁波明禾新能源科技有限公司 | Converter, control method of converter and photovoltaic energy storage charging system |
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