CN111293920A - Control device and control method of inverter circuit - Google Patents

Control device and control method of inverter circuit Download PDF

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Publication number
CN111293920A
CN111293920A CN202010112844.0A CN202010112844A CN111293920A CN 111293920 A CN111293920 A CN 111293920A CN 202010112844 A CN202010112844 A CN 202010112844A CN 111293920 A CN111293920 A CN 111293920A
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current
voltage
value
inverter circuit
control module
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CN202010112844.0A
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CN111293920B (en
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王梁
冯孝伟
王辉
于安博
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Hefei Yangguang Electric Power Technology Co ltd
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Hefei Yangguang Electric Power Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The embodiment of the invention discloses a control device and a control method of an inverter circuit, wherein the device comprises a signal acquisition module, a current outer ring control module and a signal control module; the signal acquisition module is used for acquiring the inductive current and the output voltage of the inverter circuit, and the current outer ring control module is used for outputting a voltage reference value according to the inductive current when the inductive current effective value is greater than the inductive current rated value; the signal control module is used for generating a driving control signal of the inverter circuit according to the voltage reference value. According to the technical scheme provided by the embodiment of the invention, when the load is overloaded, the output power of the inverter circuit is reduced, the heating value of the system is controlled within a safety range, and the influence on the use of the electric appliance caused by the shutdown of the system is avoided.

Description

Control device and control method of inverter circuit
Technical Field
The embodiment of the invention relates to the technical field of power electronic protection, in particular to a control device and a control method of an inverter circuit.
Background
With the rapid development of electric vehicles, people have higher and higher requirements on electric vehicles, and the electric vehicles are expected to have a discharging function, that is, electric energy output by batteries of the electric vehicles can be converted into alternating current to supply power to electric appliances.
At present, the conversion between the electric energy of the battery and the alternating current can be realized by adopting an on-board charger (OBC) of a charging vehicle. The bidirectional OBC works in the forward direction to realize AC-DC conversion, and the power grid voltage is converted into direct current to charge a power battery of the electric automobile; the bidirectional OBC works reversely to realize the conversion of DC-AC, and the electric energy is reversely inverted from the power battery and converted into alternating current for the use of an electric appliance. In the prior art, a voltage and current double-closed-loop control mode is adopted in the reverse inversion process, the control mode is usually limited by referring to the national standard of an off-grid inverter when a load is overloaded, and when the overload occurs, a reverse inversion circuit carries out overload protection in a short time, so that the shutdown is caused, and the normal use of an electric appliance is seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a control device and a control method of an inverter circuit, which are used for performing power limiting protection when a load is overloaded, so that the system cannot easily generate an overload shutdown event, and the operation capacity and reliability of the system are improved.
In a first aspect, an embodiment of the present invention provides a control device for an inverter circuit, configured to perform a power-limited operation when an output of the inverter circuit is overloaded, where the control device includes: the device comprises a signal acquisition module, a current outer ring control module and a signal control module; the input end of the signal acquisition module is electrically connected with the inverter circuit, the first output end of the signal acquisition module is electrically connected with the feedback end of the current outer ring control module, the second output end of the signal acquisition module is electrically connected with the feedback end of the signal control module, the output end of the current outer ring control module is electrically connected with the input end of the signal control module, and the output end of the signal control module is electrically connected with the inverter circuit;
the signal acquisition module is used for acquiring the inductive current of the inverter circuit and the output voltage of the inverter circuit in real time, feeding the inductive current back to the current outer loop control module and feeding the output voltage back to the signal control module;
the current outer ring control module is used for outputting a voltage reference value according to the inductive current when the inductive current effective value is larger than the inductive current rated value;
the signal control module is used for generating a driving control signal of the inverter circuit according to the voltage reference value.
Optionally, the signal control module includes a voltage outer loop control module and a current inner loop control module;
the input end of the voltage outer ring control module is electrically connected with the output end of the current outer ring control module, the output end of the voltage outer ring control module is electrically connected with the input end of the current inner ring control module, and the output end of the current inner ring control module is electrically connected with the inverter circuit;
the voltage outer ring control module is used for outputting an inductive current reference value from an output end of the voltage outer ring control module according to the voltage reference value; and the current inner ring control module is used for outputting a driving control signal of the inverter circuit from an output end of the current inner ring control module according to the inductive current reference value.
Optionally, the current outer loop control module includes a current computing unit, a control component, a signal generator, and a multiplier;
the current calculating unit is connected with the signal acquisition module and is used for converting the inductive current into an inductive current effective value;
the input end of the control component is connected with the current calculation unit and used for outputting a voltage effective value according to the inductance current effective value;
the output end of the signal generator is connected with the first input end of the multiplier and is used for generating the amplitude value
Figure BDA0002390605870000031
The sinusoidal signal of (2);
the second input end of the multiplier is connected with the output end of the control component, the output end of the multiplier is connected with the input end of the voltage outer loop control module, and the multiplier is used for multiplying the voltage effective value and the sinusoidal signal to obtain the voltage reference value.
Optionally, the control assembly comprises a first control unit;
the first control unit is used for calculating a preset inductance current reference value and an inductance current effective value and limiting amplitude to obtain the voltage effective value when the inductance current effective value is greater than or equal to the preset inductance current value; and the preset inductance current value is larger than the rated value of the inductance current.
Optionally, the first control module includes a first comparator, a first controller, and a first limiter;
the input end of the comparator inputs a preset inductive current reference value, the feedback receiving end of the comparator inputs the inductive current effective value, and the comparator is used for comparing the preset inductive current reference value with the inductive current effective value to make a difference and outputting a first difference value;
the input end of the first controller is connected with the output end of the comparator, and is used for adjusting the first difference value and outputting a first voltage effective value;
the input of first amplitude limiter with the output of first controller is connected, the output of first amplitude limiter with the second input of multiplier is connected, first amplitude limiter is used for right the first voltage effective value carries out the amplitude limit, and exports the voltage effective value.
Optionally, the control assembly further comprises a second control unit;
and the second control module is used for calculating the voltage under the rated output power according to the inductive current effective value and limiting the amplitude when the inductive current effective value is larger than the inductive current rated value and smaller than the preset inductive current value to obtain the voltage effective value.
Optionally, the second control unit includes a voltage calculating unit and a second limiter;
the input end of the voltage calculation unit inputs the inductive current effective value, and the voltage calculation unit is used for outputting a second voltage effective value according to the rated output power and the inductive current effective value;
the input of second amplitude limiter with the output of voltage calculation unit is connected, the output of second amplitude limiter with the second input of multiplier is connected, the second amplitude limiter is used for right the second voltage effective value carries out the amplitude limit, and exports the voltage effective value.
Optionally, the signal control module further includes a third amplitude limiter; and the third amplitude limiter is connected with the output end of the voltage outer ring control module.
Optionally, the current outer loop control module is further configured to output a rated voltage of the inverter circuit when the inductive current effective value is smaller than or equal to the inductive current rated value.
In a second aspect, an embodiment of the present invention further provides a method for controlling an inverter circuit, where the method for controlling the inverter circuit includes:
acquiring an inductive current of the inverter circuit and an output voltage of the inverter circuit;
when the inductive current is larger than the rated inductive current value, calculating a voltage reference value according to the inductive current;
and generating a driving control signal of the inverter circuit according to the voltage reference value.
According to the embodiment of the invention, the signal module is used for acquiring the inductive current and the output voltage of the inverter circuit in real time, the current outer ring control module takes the inductive current effective value as the feedback quantity, when the inductive current effective value is larger than the inductive current rated value, the voltage reference value of the voltage outer ring control module is output according to the inductive current, and the signal control module outputs the driving control signal of the inverter circuit according to the voltage reference value and the output voltage to change the output voltage and the output current of the inverter circuit, so that the power reduction protection of the inverter circuit is realized. When the load is overloaded, the output power of the inverter circuit is reduced, the heating value of the system is controlled within a safety range, and the system is prevented from being stopped, so that the normal use of the electric appliance is influenced.
Drawings
Fig. 1 is a block diagram of a control device of an inverter circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of another control device of an inverter circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of another control device of an inverter circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of another control device of an inverter circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of another control device of an inverter circuit according to an embodiment of the present invention;
fig. 6 is a block diagram of another control device of an inverter circuit according to an embodiment of the present invention;
fig. 7 is a flowchart of a control method of an inverter circuit according to an embodiment of the present invention;
fig. 8 is a flowchart of another inverter circuit control method according to an embodiment of the present invention;
fig. 9 is a flowchart of another inverter circuit control method according to an embodiment of the present invention;
fig. 10 is a control block diagram of an inverter circuit according to an embodiment of the present invention;
fig. 11 is a schematic diagram of power region division according to an embodiment of the present invention;
fig. 12 is waveforms of an output voltage and an inductor current of an inverter circuit according to an embodiment of the present invention;
fig. 13 is a waveform diagram of an inductance current effective value and a voltage effective value of an output voltage of an inverter circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a control device of an inverter circuit according to an embodiment of the present invention, where the control device of the inverter circuit according to the embodiment of the present invention is configured to perform a power-limited operation when an output of the inverter circuit is overloaded. Referring to fig. 1, the control device of the inverter circuit includes: the device comprises a signal acquisition module 10, a current outer loop control module 20 and a signal control module 200; an input end B1 of the signal acquisition module 10 is electrically connected with the inverter circuit 100, a first output end B2 of the signal acquisition module 10 is electrically connected with a feedback end C1 of the current outer-loop control module 20, a second output end B3 of the signal acquisition module 10 is electrically connected with a feedback end F3 of the signal control module 200, an output end C2 of the current outer-loop control module 20 is electrically connected with an input end F1 of the signal control module 200, and an output end F2 of the signal control module 200 is electrically connected with the inverter circuit 100;
the signal acquisition module 10 is used for acquiring the inductive current I of the inverter circuit 100 in real timeLAnd the output voltage U of the inverter circuit 100oAnd the inductor current I is measuredLFeedback to the current outer loop control module 20 and output voltage UoFeedback to the signal control module 30;
the current outer loop control module 20 is used for controlling the effective value I of the inductive currentL-RMSGreater than rated value of inductor current IL-NAccording to the inductor current ILReference value U of output voltageo-ref；
The signal control module is used for generating a driving control signal of the inverter circuit according to the voltage reference value.
Specifically, the inverter circuit 100 is configured to convert the dc power input from the input terminal a1 into ac power and output the ac power from the output terminal a2 for the power utilization. The topology of the inverter circuit 100 generally includes a dc source, a single-phase full bridge, an inductor-capacitor filter, and an ac load, and when the ac load is a medium load or above, the output current of the inverter circuit 100 and the inductor current ILCan be treated equivalently, so that the inductor current I can be usedLInstead of the output current of the inverter circuit 100, closed-loop control is performed. The signal acquisition module 10 acquires the output voltage U of the inverter circuit 100 in real timeoAnd the inductor current ILAnd the inductor current I is measuredLFeedback end C of feedback to current outer loop control module 201, will output voltage UoTo the feedback terminal F3 of the signal control module. . The current outer loop control module 20 converts the inductor current ILConversion into an effective value of the inductor current IL-RMSAnd the effective value of the inductive current IL-RMSAs the feedback quantity of the current outer loop control module 20, when the effective value of the inductive current is IL-RMSGreater than rated value of inductor current IL-NThat is, when the inverter circuit 100 is overloaded, the current outer loop control module 20 controls the inverter circuit according to the inductor current ILReference value U of output voltageo-refTo input F1 of signal control module 200. Wherein the voltage reference value Uo-refIs the maximum value of the output voltage of the current outer loop control module 20, the voltage reference value Uo-refAnd the output voltage U of the inverter circuit 100oAnd (4) associating.
The signal control module 200 may be a closed loop adjusting module for adjusting the voltage reference U according to the output voltage of the current outer loop control module 20o-refOutput voltage U to inverter circuit 100oClosed-loop regulation, e.g. of the output voltage U of the inverter circuit 100oAnd performing PI regulation. When the load of the inverter circuit 100 is overloaded, the current outer loop control module 20 outputs the inductive current I collected by the signal collection module 10LConversion into an effective value of the inductor current IL-RMSAnd the effective value of the inductive current IL-RMSPerforming PI calculation as the feedback quantity of the current outer loop control module 20 and outputting a voltage reference value Uo-refTo the signal control module 200, the signal control module 200 is according to the voltage reference value Uo-refAnd the output voltage U collected by the signal collection module 10oPerforming PI calculation, and outputting a driving control signal of the inverter circuit 100, wherein the inverter circuit 100 changes the operation state according to the driving control signal to regulate the output voltage UoAnd the inductor current ILSo that the output power is reduced to a safe range to eliminate the overload phenomenon.
According to the embodiment of the invention, the signal module is used for acquiring the inductive current and the output voltage of the inverter circuit in real time, the current outer ring control module takes the inductive current effective value as the feedback quantity, when the inductive current effective value is larger than the inductive current rated value, the voltage reference value of the voltage outer ring control module is output according to the inductive current, and the signal control module outputs the driving control signal of the inverter circuit according to the voltage reference value and the output voltage to change the output voltage and the output current of the inverter circuit, so that the power reduction protection of the inverter circuit is realized. When the load is overloaded, the output power of the inverter circuit is reduced, the heating value of the system is controlled within a safety range, and the system is prevented from being stopped, so that the normal use of the electric appliance is influenced.
Optionally, fig. 2 is a block diagram of a structure of another inverter circuit control device according to an embodiment of the present invention, and referring to fig. 2, on the basis of the foregoing embodiment, the signal control module 200 includes a voltage outer loop control module 30 and a current inner loop control module 40;
an input end D1 of the voltage outer ring control module 30 is electrically connected with an output end C2 of the current outer ring control module 20, an output end D2 of the voltage outer ring control module 30 is electrically connected with an input end of the current inner ring control module E1, and an output end E2 of the current inner ring control module 40 is electrically connected with the inverter circuit 100;
the voltage outer loop control module 30 is used for controlling the voltage according to the voltage reference value Uo-refThe inductor current reference value I is output from the output end D2L-ref(ii) a The current inner loop control module 40 is used for controlling the current according to the inductor current reference value IL-refThe drive control signal of the inverter circuit 100 is output from an output terminal E2 thereof.
Specifically, the signal acquisition module 10 acquires the output voltage U of the inverter circuit 100 in real timeoAnd the inductor current ILAnd output the voltage UoFeedback as feedback quantity to feedback terminal D3 of voltage outer loop control module 30 to feed back the inductive current ILTo the feedback terminal C1 of the current outer loop control module 20 and the feedback terminal E3 of the current inner loop control module 40. The current outer loop control module 20 converts the inductor current ILConversion into an effective value of the inductor current IL-RMSAnd the effective value of the inductive current IL-RMSAs the feedback quantity of the current outer loop control module 20, when the effective value of the inductive current is IL-RMSGreater than rated value of inductor current IL-NThat is, when the inverter circuit 100 is overloaded, the current outer loop control module 20 controls the inverter circuit according to the inductor current ILReference value U of output voltageo-refTo voltage outer ringInput D1 of control module 30.
The voltage outer loop control module 30 uses the voltage reference value Uo-refAs a reference, the output voltage UoAs feedback quantity, obtaining the reference value I of the inductance current by calculationL-refThe input E1 of the input current inner loop control module 40 may be calculated, for example, by Proportional Integral (PI) or Proportional Integral Derivative (PID). The current inner loop control module 40 uses the inductive current ILPI calculation is carried out for the feedback quantity according to the reference value I of the inductive currentL-refAnd the inductive current ILOutputs a driving control signal of the inverter circuit 100 to adjust the output voltage U of the inverter circuit 100oAnd the inductor current IL。
Optionally, fig. 3 is a block diagram of a structure of another control device of an inverter circuit according to an embodiment of the present invention, and referring to fig. 3, on the basis of the above embodiment, the current outer loop control module 20 includes a current calculating unit 201, a control component 202, a signal generator 203, and a multiplier 204;
the current calculating unit 201 is connected to the signal collecting module 10, and is used for calculating the inductive current ILConversion into an effective value of the inductor current IL-RMS；
The input terminal of the control component 202 is connected to the current calculating unit 201 for calculating the effective value I of the inductor currentL-RMSEffective value of output voltage Uo-RMS；
An output of the signal generator 203 is connected to a first input of a multiplier 204 for generating a signal having an amplitude of
Figure BDA0002390605870000091
The sinusoidal signal of (2);
a second input terminal of the multiplier 204 is connected to the output terminal of the control component 202, an output terminal of the multiplier 204 is connected to the input terminal D1 of the voltage outer loop control module 30, and the multiplier 204 is used for converting the voltage effective value U too-RMSMultiplying with sine signal to obtain voltage reference value Uo-ref。
Specifically, the current calculating unit 201 is used for calculating the inductive current I collected by the signal collecting module 10LConversion into inductive electricityEffective value of the flow IL-RMSThe output is sent to the control component 202, and the control component 202 generates the effective value I of the inductive current according to the effective value I of the inductive currentL-RMSCalculating the effective value U of the voltageo-RMSThen the effective value of the voltage U is calculatedo-RMSMultiplied by an amplitude of
Figure BDA0002390605870000092
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o-ref. Illustratively, the control component 202 may adjust the inductor current to an effective value IL-RMSObtaining a voltage effective value U through PI calculationo-RMS。
Optionally, fig. 4 is a block diagram of a structure of another control device of an inverter circuit according to an embodiment of the present invention, and on the basis of the foregoing embodiment, referring to fig. 4, the control component 202 includes a first control unit 205;
the first control unit 205 is used for controlling the effective value of the inductor current IL-RMSWhen the current value is larger than or equal to the preset inductance current value I, the preset inductance current reference value I is setrefWith the effective value of the inductor current IL-RMSCalculating and limiting amplitude to obtain a voltage effective value Uo-RMS(ii) a Wherein the preset inductance current value I is larger than the rated value I of the inductance currentL-N。
Specifically, when the output of the inverter circuit 100 is overloaded, the output power and the output current of the inverter circuit both exceed the rated values, so that when the circuit hardware is designed, the heat dissipation capacity and the overcurrent capacity of the hardware device are both large when the circuit hardware is selected, and the output current of the inverter circuit 100 can be allowed to exceed the rated current value in a certain range. Illustratively, the embodiment of the invention selects the rated value I of the inductance current with the preset inductance current value I being 1.2 timesL-NA predetermined inductor current reference value IrefAs a reference for the first control unit 205, wherein the inductor current reference I is presetrefEqual to 1.2 times the effective value of the inductor current rating. The first control unit 205 is configured to control the first inductor according to a predetermined inductor current reference value IrefAnd the effective value of the inductive current IL-RMSPerforming PI calculation and amplitude limiting to obtain a voltage effective value Uo-RMS。
Alternatively, on the basis of the above-described embodiment, with continued reference to fig. 4, the first control unit 205 includes a first comparator 2051, a first controller 2052, and a first limiter 2053;
the input terminal of the first comparator 2051 inputs a preset inductor current reference value IrefThe feedback receiving end of the first comparator 2051 inputs the effective value of the inductor current IL-RMSThe first comparator 2051 is used for presetting an inductor current reference value IrefWith the effective value of the inductor current IL-RMSComparing and making difference, and outputting a first difference value;
an input end of the first controller 2052 is connected to an output end of the first comparator 2051, and is configured to adjust the first difference and output a first voltage effective value;
an input end of the first limiter 2053 is connected to an output end of the first controller 2052, an output end of the first limiter 2053 is connected to a second input end of the multiplier 204, and the first limiter 2053 is configured to limit the first voltage effective value and output the voltage effective value Uo-RMS。
Specifically, the first comparator 2051 is used for presetting the inductor current reference value IrefWith the effective value of the inductor current IL-RMSComparing and subtracting, and outputting a first difference value, wherein the reference value of the inductor current I is presetrefEqual to 1.2 times the effective value of the inductor current rating. The first difference is a preset inductor current reference value IrefWith the effective value of the inductor current IL-RMSThe effective value of the inductive current I collected by the signal collecting module 10 can be obtained by the first controller 2052L-RMSLimiting the inductor current rating I to 1.2L-NThe first PI controller 2052 includes, but is not limited to, a PI controller. The first voltage effective value output by the first controller 2052 is limited to 5/6 times the rated output voltage effective value U by the first limiter 2053oNThe output power of the inverter circuit 100 is limited to the rated power P as followsoThe overload power limit protection of the inverter circuit 100 is realized when the inductance current has an effective value IL-RMSWhen the current value is larger than or equal to the preset inductance current value I, the output power of the inverter circuit 100 is reduced to realize the non-stop operation of the system without influencing the normal use of the electric applianceThe application is as follows.
Optionally, fig. 5 is a block diagram of a structure of another control device of an inverter circuit according to an embodiment of the present invention, and on the basis of the foregoing embodiment, referring to fig. 5, the control assembly 202 further includes a second control unit 206;
the second control unit 206 is used for controlling the effective value of the inductor current IL-RMSGreater than rated value of inductor current IL-NAnd when the value is less than the preset inductance current value I, the effective value I of the inductance current is obtainedL-RMSCalculating rated output power PoThe lower voltage is subjected to amplitude limiting to obtain a voltage effective value Uo-RMS。
Specifically, the preset inductance current value I is 1.2 times of the rated inductance current value IL-NWhen the effective value of the inductive current I is collected by the signal collection module 10L-RMSGreater than rated value of inductor current IL-NAnd when the current value is smaller than the preset inductance current value I, the power reduction protection is performed through the second control unit 206, so as to realize the non-stop operation of the system.
Alternatively, on the basis of the above-described embodiment, with continued reference to fig. 5, the second control unit 206 includes a voltage calculation unit 2061 and a second limiter 2062;
the input end of the voltage calculation unit 2061 inputs the inductance current effective value IL-RMSThe voltage calculation unit 2061 is used for calculating the rated output power PoWith the effective value of the inductor current IL-RMSAnd outputting a second voltage effective value;
an input terminal of the second limiter 2062 is connected to the output terminal of the voltage calculating unit 2061, an output terminal of the second limiter 2062 is connected to the second input terminal of the multiplier 204, and the second limiter 2062 is configured to limit the second voltage effective value and output the voltage effective value Uo-RMS。
Specifically, the input terminal of the voltage calculating unit 2061 is electrically connected to the output terminal of the current calculating unit 201, and receives the effective value I of the inductive current output by the current calculating unit 201L-RMSAnd calculating the rated output power P according to a power calculation formulaoWith the effective value of the inductor current IL-RMSTo obtain a second voltage effective value, the second voltage is applied via a second limiter 2062The voltage effective value is limited to the rated output voltage effective value U of the inverter circuit 100oNRated output voltage effective value U equal to 5/6 timesoNBetween, the effective value of the output voltage Uo-RMS. Effective value of voltage Uo-RMSMultiplied by an amplitude of
Figure BDA0002390605870000121
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o-ref。
Optionally, fig. 6 is a block diagram of a structure of another control device of an inverter circuit according to an embodiment of the present invention, and on the basis of the foregoing embodiment, referring to fig. 6, the signal control module 200 further includes a third amplitude limiter 50;
the third limiter 50 is connected to the output of the voltage outer loop control module 30.
Specifically, the third limiter 50 is disposed in the signal control module 200 and connected to the output end D2 of the voltage outer loop control module 30. Using effective value of inductive current IL-RMSAs the control quantity of the current outer loop control module 20, the bandwidth of the current outer loop control module 20 is lower than the bandwidth of the current inner loop control module 40 using the inductor current as the control quantity, and therefore, the current outer loop control module 20 needs 1-2 power frequency cycles to complete the dynamic response. During the dynamic response of the current outer loop control module 20, the situation of excessive inductor current may occur, which is easy to damage the device, therefore, the third limiter 50 is added to the output end D2 of the voltage outer loop control module 30 to provide the reference value I of the inductor current output by the voltage outer loop control module 30L-refAnd amplitude limiting is carried out, so that the inductive current is not too large, the heat productivity of the inverter circuit 100 is in a controllable range, and the long-time operation without shutdown of the system is realized.
Optionally, on the basis of the above embodiment, with continuing reference to fig. 6, the current outer loop control module 20 is further configured to determine the effective inductor current value IL-RMSLess than or equal to the rated value of the inductive current IL-NThe rated voltage U of the inverter circuit 100 is outputtedoN。
Specifically, when the signal acquisition module 10 acquires the effective value of the inductive currentIL-RMSLess than or equal to the rated value of the inductive current IL-NWhen the inverter circuit 100 is not overloaded, the current outer loop control module 20 directly uses the effective value of the rated voltage value output by the inverter circuit 100 as the voltage effective value Uo-RMSOutputs the voltage and outputs the voltage effective value U through a multiplier 204o-RMSMultiplied by an amplitude of
Figure BDA0002390605870000131
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o--ref. The voltage outer loop control module 30 is based on the voltage reference Uo-refAnd the output voltage U collected by the signal collection module 10oThe reference value I of the inductive current is output through PI regulationL-refAnd the inductor current is referenced to the value IL-refAs a reference for the current inner loop control module 40, the current inner loop control module 40 is based on the inductor current reference IL-refAnd the inductive current I collected by the signal collection module 10LThe driving control signal of the inverter circuit 100 is output to adjust the duty ratio of the transistors in the inverter circuit 100, so that the output current and the output voltage of the inverter circuit 100 are changed, and the inverter circuit 100 can operate for a long time without stopping under the condition of overload.
Optionally, fig. 7 is a flowchart of a control method of an inverter circuit according to an embodiment of the present invention, and with reference to fig. 6 and fig. 7 on the basis of the above embodiment, the control method of the inverter circuit according to the embodiment of the present invention includes:
and step 710, acquiring the inductive current of the inverter circuit and the output voltage of the inverter circuit.
Specifically, the topology of the inverter circuit 100 generally includes a dc source, a single-phase full bridge, an inductor-capacitor filter, and an ac load, and when the ac load is a medium load or above, the output current of the inverter circuit 100 and the inductor current ILCan be treated equivalently, so that the inductor current I can be usedLInstead of the output current of the inverter circuit 100, closed-loop control is performed. The signal acquisition module 10 acquires the output voltage U of the inverter circuit 100 in real timeoAnd the inductor current ILAnd output the voltage UoFeedback as feedback quantity to feedback terminal D3 of voltage outer loop control module 30 to feed back the inductive current ILTo the feedback terminal C1 of the current outer loop control module 20 and the feedback terminal E3 of the current inner loop control module 40.
And 720, when the inductive current is larger than the rated value of the inductive current, calculating a voltage reference value according to the inductive current.
Specifically, the current outer loop control module 20 adjusts the inductor current ILConversion into an effective value of the inductor current IL-RMSAnd the effective value of the inductive current IL-RMSAs the feedback quantity of the current outer loop control module 20, when the effective value of the inductive current is IL-RMSGreater than rated value of inductor current IL-NThat is, when the inverter circuit 100 is overloaded, the current outer loop control module 20 controls the inverter circuit according to the inductor current ILReference value U of output voltageo-refTo input D1 of voltage outer loop control module 30. Wherein the voltage reference value Uo-refIs the maximum value of the output voltage of the current outer loop control module 20, the voltage reference value Uo-refAnd the output voltage U of the inverter circuit 100oAnd (4) associating.
And step 730, generating a driving control signal of the inverter circuit according to the voltage reference value.
Specifically, the signal control module 200 is configured to control the output according to the voltage reference Uo-refThe driving control signal of the inverter circuit 100 is generated, and the signal control module 200 includes a voltage outer loop control module 30 and a current inner loop control module 40. The voltage outer loop control module 30 uses the voltage reference value Uo-refAs a reference, the output voltage UoAs a feedback quantity, an inductance current reference value I is calculated by Proportional Integral (PI) or Proportional Integral Derivative (PID)L-refAnd can make the output voltage UoCan track the voltage reference value U wello-refMaking the effective value of the output voltage be a voltage reference value Uo-refOutput voltage UoThe waveform of (a) is a sine wave.
The voltage outer loop control module 30 calculates the reference value I of the inductor current by Proportional Integral (PI) or Proportional Integral Derivative (PID)L-refInput terminal E1 of current inner loop control module 40, current inner loop control module 40Inductive current ILPI calculation is carried out for the feedback quantity according to the reference value I of the inductive currentL-refAnd the inductive current ILOutputs a driving control signal of the inverter circuit 100 to adjust the output voltage U of the inverter circuit 100oAnd the inductor current IL. The current inner loop control module 40 can quickly respond to the influence of load change on the output characteristic of the inverter circuit, and can improve the dynamic response characteristic of the system.
Optionally, fig. 8 is a flowchart of another control method of an inverter circuit according to an embodiment of the present invention, and with reference to fig. 8 on the basis of the foregoing embodiment, the control method of the inverter circuit according to the embodiment includes:
and step 810, acquiring the inductive current of the inverter circuit and the output voltage of the inverter circuit.
And 820, when the inductance current effective value is larger than or equal to the preset inductance current value, calculating and limiting the preset inductance current reference value and the inductance current effective value to obtain a voltage effective value, wherein the preset inductance current value is larger than the inductance current rated value.
Specifically, when the output of the inverter circuit 100 is overloaded, the output power and the output current of the inverter circuit both exceed the rated values, so that when the circuit hardware is designed, the heat dissipation capacity and the overcurrent capacity of the hardware device are both large when the circuit hardware is selected, and the output current of the inverter circuit 100 can be allowed to exceed the rated current value in a certain range. Illustratively, the embodiment of the invention selects the rated value I of the inductance current with the preset inductance current value I being 1.2 timesL-NA predetermined inductor current reference value IrefAs a reference for the first control unit 205, wherein the inductor current reference I is presetrefEqual to 1.2 times the effective value of the inductor current rating. The first control unit 205 is configured to control the first inductor according to a predetermined inductor current reference value IrefAnd the effective value of the inductive current IL-RMSCarrying out proportional integral calculation and amplitude limiting to obtain a voltage effective value Uo-RMS。
The first comparator 2051 outputs a predetermined inductor current reference value IrefWith the effective value of the inductor current IL-RMSComparing and subtracting, and outputting a first difference valueIn the method, an inductor current reference value I is presetrefEqual to 1.2 times the effective value of the inductor current rating. The first difference is a preset inductor current reference value IrefWith the effective value of the inductor current IL-RMSThe effective value of the inductive current I collected by the signal collecting module 10 can be obtained by the first controller 2052L-RMSLimiting the inductor current rating I to 1.2L-N. The first voltage effective value output by the first controller 2052 is limited to 5/6 times the rated output voltage effective value U by the first limiter 2053oNThe output power of the inverter circuit 100 is limited to the rated power P as followsoThe overload power limit protection of the inverter circuit 100 is realized when the inductance current has an effective value IL-RMSWhen the current value is larger than or equal to the preset inductance current value I, the output power of the inverter circuit 100 is reduced, so that the system can run without stopping, and the normal use of the electric appliance can not be influenced.
Step 830, make the voltage effective value and amplitude value as
Figure BDA0002390605870000161
The sinusoidal signals of (a) are multiplied to obtain a voltage reference value.
Specifically, the current calculating unit 201 is used for calculating the inductive current I collected by the signal collecting module 10LConversion into an effective value of the inductor current IL-RMSThe output is sent to the control component 202, and the control component 202 generates the effective value I of the inductive current according to the effective value I of the inductive currentL-RMSCalculating the effective value U of the voltageo-RMSThen the effective value of the voltage U is calculatedo-RMSMultiplied by an amplitude of
Figure BDA0002390605870000162
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o-ref。
And 840, generating a driving control signal of the inverter circuit according to the voltage reference value.
Optionally, fig. 9 is a flowchart of another control method of an inverter circuit according to an embodiment of the present invention, and with reference to fig. 9 on the basis of the foregoing embodiment, the control method of the inverter circuit according to the embodiment includes:
and step 910, acquiring an inductive current of the inverter circuit and an output voltage of the inverter circuit.
And 920, when the inductance current effective value is larger than the inductance current rated value and smaller than the preset inductance current value, calculating the voltage under the rated output power according to the inductance current effective value and limiting the amplitude to obtain a voltage effective value.
Specifically, the preset inductance current value I is 1.2 times of the rated inductance current value IL-NWhen the effective value of the inductive current I is collected by the signal collection module 10L-RMSGreater than rated value of inductor current IL-NAnd when the current value is smaller than the preset inductance current value I, the power reduction protection is performed through the second control unit 206, so as to realize the non-stop operation of the system. The input terminal of the voltage calculating unit 2061 is electrically connected to the output terminal of the current calculating unit 201, and receives the effective value I of the inductive current output by the current calculating unit 201L-RMSAnd calculates to obtain a second voltage effective value according to the power calculation formula, and limits the second voltage effective value to the rated output voltage effective value U of the inverter circuit 100 through the second limiter 2062oNRated output voltage effective value U equal to 5/6 timesoNBetween, the effective value of the output voltage Uo-RMS. Effective value of voltage Uo-RMSMultiplied by an amplitude of
Figure BDA0002390605870000171
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o-ref。
Step 930, setting the voltage effective value and amplitude value to be
Figure BDA0002390605870000172
The sinusoidal signals of (a) are multiplied to obtain a voltage reference value.
And 940, generating a driving control signal of the inverter circuit according to the voltage reference value.
According to the embodiment of the invention, the inductive current and the output voltage of the inverter circuit are acquired in real time through the signal module, the current outer ring control module takes the inductive current effective value as the feedback quantity, when the inductive current effective value is larger than the inductive current rated value, the voltage reference value of the voltage outer ring control module is output according to the inductive current, the voltage outer ring control module calculates the current reference value of the current inner ring control module according to the voltage reference value and the output voltage, the current inner ring control module outputs the driving control signal of the inverter circuit to change the output voltage and the output current of the inverter circuit, and the power reduction protection of the inverter circuit is realized. Can quick response when the load transships to reduce inverter circuit's output current through reducing power, control the heating value of system in safety range, avoid the system to shut down, thereby influence the normal use of electrical apparatus.
Optionally, fig. 10 is a control block diagram of an inverter circuit according to an embodiment of the present invention, and with reference to fig. 6 and fig. 10 on the basis of the above embodiment, a specific operating principle of a control method of an inverter circuit according to an embodiment of the present invention is as follows:
when the output load of the inverter circuit is overloaded, if the output voltage U isoNot changing, e.g. output voltage UoThe voltage can be 220V, the output current of the inverter circuit is larger than the rated current, the risk of too fast temperature rise or overcurrent burning exists, and the longer the overload running time of the inverter circuit is, the greater the risk of damage is. Therefore, the control device of the inverter circuit provided by the embodiment of the invention can be used for carrying out power reduction protection operation on the inverter circuit when the inverter circuit is overloaded, so that the system can continuously operate without shutdown. In order to realize the overload power-down protection, the current outer control module 20 is added on the basis of the voltage outer loop control module 30 and the current inner loop control module 40, and the effective value I of the inductive current is usedL-RMSThe current external control module 20 outputs a voltage effective value U as a feedback quantityo-RMSAnd applying the effective value U of the voltageo-RMSMultiplied by the amplitude value by the multiplier 204
Figure BDA0002390605870000181
The sinusoidal signal of (a) is obtained as the voltage reference value U of the voltage outer loop control module 30o-ref. A third limiter 50 is added to the output of the voltage outer loop control module 30 to prevent the inductor current from being too large. When the circuit hardware is designed, the heat dissipation capacity and the overcurrent capacity of the hardware device are large when the hardware device is selected, and the circuit hardware can be designedTo allow the output current of the inverter circuit 100 to exceed a certain range of rated current values. The preset inductance current value I can be 1.2 times of the inductance current rated value IL-NHowever, especially the input power of the inverter circuit is limited by the subsequent circuit, and cannot exceed the rated power P for a long timeoTherefore, in order to enable the inverter circuit to operate without stopping for a long time, the embodiment of the invention divides the power into three regions. Fig. 11 is a schematic diagram of power region division according to an embodiment of the present invention, referring to fig. 11, when an inductor current effective value I is obtainedL-RMSLess than rated value of inductor current IL-NWhen the inverter circuit works in a constant voltage mode CV in a normal operation area; when the effective value of the inductive current IL-RMSGreater than or equal to 1.2 times the rated value of the inductive current IL-NWhen the inverter circuit works in a constant current mode CC of an overload power reduction operation area; when the effective value of the inductive current IL-RMSGreater than rated value of inductor current IL-NAnd less than 1.2 times the rated value of the inductor current IL-NWhen the inverter circuit is operated in the constant power mode CP of the overload power reduction operation area.
The first comparator 2051 is used for presetting an inductor current reference value IrefWith the effective value of the inductor current IL-RMSComparing and subtracting, and outputting a first difference value, wherein the reference value of the inductor current I is presetrefEqual to 1.2 times the effective value of the inductor current rating. The first difference is a preset inductor current reference value IrefWith the effective value of the inductor current IL-RMSThe effective value of the inductive current I collected by the signal collecting module 10 can be obtained by the first controller 2052L-RMSLimiting the inductor current rating I to 1.2L-N. The first voltage effective value output by the first controller 2052 is limited to 5/6 times the rated output voltage effective value U by the first limiter 2053oNBelow (i.e., 183.3V), and not lower than 110V, so as to limit the output power of the inverter circuit 100 to the rated power PoThe following. If the load exceeds 200% of the rated load, the output voltage U of the inverter circuit at the momentoHas reached 110V, at which time the output voltage U is due to the action of the first limiter 2053oNo longer reduced, output current (inductor current)IL) It will increase again, at which point the over-current protection of the system is active. When the load is reduced to the rated value range, the output voltage U of the inverter circuitoAnd can be restored to 220V. Using effective value of inductive current IL-RMSAs the control quantity of the current outer loop control module 20, the bandwidth of the current outer loop control module 20 is lower than the bandwidth of the current inner loop control module 40 using the inductor current as the control quantity, and therefore, the current outer loop control module 20 needs 1-2 power frequency cycles to complete the dynamic response. During the dynamic response of the current outer loop control module 20, the situation of excessive inductor current may occur, which is easy to damage the device, therefore, the third limiter 50 is added to the output end D2 of the voltage outer loop control module 30 to provide the reference value I of the inductor current output by the voltage outer loop control module 30L-refAnd amplitude limiting is carried out, so that the inductive current is not too large, the heat productivity of the inverter circuit 100 is in a controllable range, and the long-time operation without shutdown of the system is realized.
Illustratively, the embodiment of the invention is further illustrated by taking an off-grid inverter circuit in a bidirectional OBC with a rated power of 3.3kW as an example. Fig. 12 is a waveform diagram of an output voltage and an inductive current of an inverter circuit according to an embodiment of the present invention, and fig. 13 is a waveform diagram of an inductive current effective value and a voltage effective value of an output voltage of an inverter circuit according to an embodiment of the present invention, where it should be noted that the inductive current in fig. 12 is a current value enlarged by 5 times, so as to clearly display the inductive current. Referring to fig. 12 and 13, when the inverter circuit is operated to 0.03s, the load of the inverter circuit is switched from the 75% rated load (R19.56 Ω) to the 150% rated load (R9.78 Ω), and is switched from the 150% rated load to the 75% rated load at 0.13 s; the load was switched from 75% rated load (R19.56 Ω) to 120% rated load (R12.22 Ω) at 0.20s, and from 120% rated load to 75% rated load at 0.30 s.
After the load is switched from 75% of rated load to 150% of rated load within 0.05s, the inductive current ILAbruptly changing into rated current IL-N1.5 times of the reference value of the inductor current IL-ref(the output of the voltage outer-loop control module 30 plus the third limiter 50), the inductive current I of the inverter circuitLIs limited and truncated to ensure the inductive current ILThe device can not be burnt too much. And the inductance current effective value I of the inverter circuitL-RMSContinuously rising, and receiving the action of the current outer ring control module 20 when the inductive current effective value IL-RMSGreater than 15A (rated value of inductive current I)L-N) The effective value U of the voltage output by the current outer loop control module 20o-RMSDuring the descent, when the current outer loop control module 20 switches from the CV mode to the CP mode, when the inductor current has an effective value IL-RMSGreater than 18A (1.2 times the rated value I of the inductive current)L-N) The current outer loop control module 20 switches to CC mode again.
The current outer loop control module 20 is finally stopped in the CC mode, and the effective voltage value U output by the current outer loop control module 20o-RMSFinally, the voltage is stabilized at 176V, and the inductive current effective value IL-RMSAlso stabilizes at 18A, the inverter circuit is limited by the power reduction in the overload stage, and the inductive current I output by the inverter circuitLConstant, output voltage UoDecrease due to the effective value of the inductive current IL-RMSThe current outer loop control module 20 responds slower, so that the effective value of the inductor current I is lowerL-RMSDuring this overload process, an excess of 1.2 times the rated value I of the inductor current occursL-NThe peak phenomenon of (a). Reference value of inductor current IL-refThe third limiter 50 acts to generate a topping phenomenon, the load is switched to 75% of rated load after 0.15s, and the output voltage U of the inverter circuitoGradually returns to 220V, and the inductive current ILAlso drops to 75% of rated current.
At 0.25s, after the load is switched from 75% of rated load to 120% of rated load, the current outer loop control module 20 is switched from CV mode to CP mode, and finally stays in CP mode, and the output voltage U is outputoFinally, the voltage is stabilized at 201V, and the inductive current effective value IL-RMSAlso stabilizes at 16.4A, and at 0.35s, the load is switched back to 75% of rated load, and the output voltage U isoAnd returns to 220V.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (11)

1. A control apparatus for an inverter circuit for performing a power-limited operation when an overload occurs in an output of the inverter circuit, comprising: the device comprises a signal acquisition module, a current outer ring control module and a signal control module; the input end of the signal acquisition module is electrically connected with the inverter circuit, the first output end of the signal acquisition module is electrically connected with the feedback end of the current outer ring control module, the second output end of the signal acquisition module is electrically connected with the feedback end of the signal control module, the output end of the current outer ring control module is electrically connected with the input end of the signal control module, and the output end of the signal control module is electrically connected with the inverter circuit;
the signal acquisition module is used for acquiring the inductive current of the inverter circuit and the output voltage of the inverter circuit in real time, feeding the inductive current back to the current outer loop control module and feeding the output voltage back to the signal control module;
the current outer ring control module is used for outputting a voltage reference value according to the inductive current when the inductive current effective value is larger than the inductive current rated value;
the signal control module is used for generating a driving control signal of the inverter circuit according to the voltage reference value.
2. The control device of the inverter circuit according to claim 1, wherein the signal control module comprises a voltage outer loop control module and a current inner loop control module;
the input end of the voltage outer ring control module is electrically connected with the output end of the current outer ring control module, the output end of the voltage outer ring control module is electrically connected with the input end of the current inner ring control module, and the output end of the current inner ring control module is electrically connected with the inverter circuit;
the voltage outer ring control module is used for outputting an inductive current reference value from an output end of the voltage outer ring control module according to the voltage reference value; and the current inner ring control module is used for outputting a driving control signal of the inverter circuit from an output end of the current inner ring control module according to the inductive current reference value.
3. The control device of the inverter circuit according to claim 2, wherein the current outer loop control module comprises a current calculation unit, a control component, a signal generator and a multiplier;
the current calculating unit is connected with the signal acquisition module and is used for converting the inductive current into an inductive current effective value;
the input end of the control component is connected with the current calculation unit and used for outputting a voltage effective value according to the inductance current effective value;
the output end of the signal generator is connected with the first input end of the multiplier and is used for generating the amplitude value
Figure FDA0002390605860000021
The sinusoidal signal of (2);
the second input end of the multiplier is connected with the output end of the control component, the output end of the multiplier is connected with the input end of the voltage outer loop control module, and the multiplier is used for multiplying the voltage effective value and the sinusoidal signal to obtain the voltage reference value.
4. The control device of the inverter circuit according to claim 3, wherein the control component includes a first control unit;
the first control unit is used for calculating a preset inductance current reference value and an inductance current effective value and limiting amplitude to obtain the voltage effective value when the inductance current effective value is greater than or equal to the preset inductance current value; and the preset inductance current value is larger than the rated value of the inductance current.
5. The control device of the inverter circuit according to claim 4, wherein the first control unit block includes a first comparator, a first controller, and a first limiter;
the input end of the first comparator inputs the preset inductive current reference value, the feedback receiving end of the first comparator inputs the inductive current effective value, and the first comparator is used for comparing the preset inductive current reference value with the inductive current effective value to make a difference and outputting a first difference value;
the input end of the first controller is connected with the output end of the first comparator, and is used for adjusting the first difference value and outputting a first voltage effective value;
the input of first amplitude limiter with the output of first controller is connected, the output of first amplitude limiter with the second input of multiplier is connected, first amplitude limiter is used for right the first voltage effective value carries out the amplitude limit, and exports the voltage effective value.
6. The control device of the inverter circuit according to claim 4, wherein the control component further comprises a second control unit;
and the second control unit is used for calculating the voltage under the rated output power according to the inductive current effective value and limiting the amplitude when the inductive current effective value is larger than the inductive current rated value and smaller than the preset inductive current value to obtain the voltage effective value.
7. The control device of the inverter circuit according to claim 6, wherein the second control unit includes a voltage calculation unit and a second limiter;
the input end of the voltage calculation unit inputs the inductive current effective value, and the voltage calculation unit is used for outputting a second voltage effective value according to the rated output power and the inductive current effective value;
the input of second amplitude limiter with the output of voltage calculation unit is connected, the output of second amplitude limiter with the second input of multiplier is connected, the second amplitude limiter is used for right the second voltage effective value carries out the amplitude limit, and exports the voltage effective value.
8. The control device of the inverter circuit according to claim 2, wherein the signal control module further comprises a third limiter;
and the third amplitude limiter is connected with the output end of the voltage outer ring control module.
9. The control device of the inverter circuit according to claim 3, wherein the current outer loop control module is further configured to output a rated voltage of the inverter circuit when the effective value of the inductor current is less than or equal to the rated value of the inductor current.
10. A control method of an inverter circuit, comprising:
acquiring an inductive current of the inverter circuit and an output voltage of the inverter circuit;
when the inductive current is larger than the rated inductive current value, calculating a voltage reference value according to the inductive current;
and generating a driving control signal of the inverter circuit according to the voltage reference value.
11. The method of claim 10, wherein calculating a voltage reference from the inductor current when the inductor current is greater than the inductor current rating comprises:
when the inductance current effective value is larger than or equal to a preset inductance current value, calculating and limiting a preset inductance current reference value and the inductance current effective value to obtain a voltage effective value, wherein the preset inductance current value is larger than an inductance current rated value;
the effective value and the amplitude of the voltage are set to be
Figure FDA0002390605860000041
Multiplying the sinusoidal signals to obtain the voltage reference value;
when the inductance current effective value is larger than the inductance current rated value and smaller than the preset inductance current value, calculating the voltage under the rated output power according to the inductance current effective value and limiting the amplitude to obtain a voltage effective value;
the effective value and the amplitude of the voltage are set to be
Figure FDA0002390605860000042
The sinusoidal signals are multiplied to obtain the voltage reference value.
CN202010112844.0A 2020-02-24 2020-02-24 Control device and control method of inverter circuit Active CN111293920B (en)

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CN1807148A (en) * 2005-01-21 2006-07-26 广西新未来信息产业股份有限公司 Parellel inversion power system for railway
CN102185509A (en) * 2011-05-26 2011-09-14 广东金华达电子有限公司 Photovoltaic grid connected inverter output current control system
CN103178769A (en) * 2013-04-03 2013-06-26 哈尔滨工业大学 Parameter offline identification method for permanent magnet synchronous motor under condition of rest
CN103956922A (en) * 2014-05-13 2014-07-30 湖南大学 Switch power supply and control method thereof
CN104079007A (en) * 2014-03-06 2014-10-01 西安理工大学 Distributed grid-connected photovoltaic power generation control method for inhibiting overvoltage of low-voltage feeder line
WO2019046939A1 (en) * 2017-09-05 2019-03-14 The Governing Council Of The University Of Toronto Electric vehicle power-hub and operating modes thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1807148A (en) * 2005-01-21 2006-07-26 广西新未来信息产业股份有限公司 Parellel inversion power system for railway
CN102185509A (en) * 2011-05-26 2011-09-14 广东金华达电子有限公司 Photovoltaic grid connected inverter output current control system
CN103178769A (en) * 2013-04-03 2013-06-26 哈尔滨工业大学 Parameter offline identification method for permanent magnet synchronous motor under condition of rest
CN104079007A (en) * 2014-03-06 2014-10-01 西安理工大学 Distributed grid-connected photovoltaic power generation control method for inhibiting overvoltage of low-voltage feeder line
CN103956922A (en) * 2014-05-13 2014-07-30 湖南大学 Switch power supply and control method thereof
WO2019046939A1 (en) * 2017-09-05 2019-03-14 The Governing Council Of The University Of Toronto Electric vehicle power-hub and operating modes thereof

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