CN112737386A - Constant-power closed-loop control power controller - Google Patents
Constant-power closed-loop control power controller Download PDFInfo
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- CN112737386A CN112737386A CN202011619114.6A CN202011619114A CN112737386A CN 112737386 A CN112737386 A CN 112737386A CN 202011619114 A CN202011619114 A CN 202011619114A CN 112737386 A CN112737386 A CN 112737386A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The invention discloses a power controller for constant power closed-loop control, which comprises: the device comprises a current inner ring control structure, a voltage outer ring control structure, an SVPWM driving module and an inverter circuit; the SVPWM driving module respectively obtains control signals with the current inner ring control structure and the voltage outer ring control structure; the inverter circuit is connected with the SVPWM driving module to obtain a driving signal; collecting three-phase current and voltage signals of a network side; converting the three-phase voltage signal into a voltage signal under a two-phase static coordinate system; the output current value of the current loop approaches to the given current through the given current upper limit value, and the maximum current limit value is realized; by enabling real-time tracking for a given voltage, maximum constant control over power output is achieved.
Description
Technical Field
The invention relates to the technical field of power controllers, in particular to a power controller for constant-power closed-loop control and a control method thereof.
Background
Under the condition that the load impedance is constant, the power controller for adjusting the output power of the network side can dynamically adjust the output power, but when the load side has large power fluctuation, the output power of the previous-stage network side is greatly influenced, even overcurrent is caused, and the overcurrent protection of the network side is triggered. In industrial production occasions, many working condition scene applications put higher requirements on the stability of the output power of the network side.
In the traditional AC/DC conversion process of the network side end, a two-level inverter is often adopted, and the main circuit topology structure is simple, and the control method is developed relatively mature, so the two-level inverter is most widely applied in the industrial field. However, the two-level inverter still faces many problems in the occasions with high power and high power quality, and a transformer is usually needed to be equipped in the high-power occasions to enable the system to work normally, so that the system cost is increased, the volume is enlarged, and the energy consumption is increased. The multi-level inverter can overcome the problems of the two-level inverter to a certain extent.
Therefore, the output power needs to be controlled in a closed loop mode on the basis of the grid-side multi-level inverter, and the requirement of various power occasions is met, and the constant power output is kept.
Disclosure of Invention
The invention provides a power controller for constant-power closed-loop control, which aims to solve the problems of uncontrollable and unstable output power of a network side in the process of outputting energy.
The invention provides a power controller for constant power closed-loop control, which comprises: the device comprises a current inner ring control structure, a voltage outer ring control structure, an SVPWM driving module and an inverter circuit;
the SVPWM driving module is respectively connected with the current inner ring control structure and the voltage outer ring control structure and is used for acquiring a control signal; the inverter circuit is connected with the SVPWM driving module and used for obtaining a driving signal and realizing constant power output through the inverter circuit.
Optionally, the current inner loop control structure includes a sampling conversion module, a phase-locked loop module, a dq conversion module, and a PI regulator;
the phase-locked loop module is connected with the sampling conversion module, and the sampling conversion module outputs voltage signals under a static coordinate system to be decoupled and outputs current angle information of a three-phase network side;
the dq conversion module is connected with the sampling conversion module and used for decoupling the inner loop control current parameter;
the PI regulator is connected with the dq conversion module and used for regulating the inner loop control current parameteriqTo a nominal maximum value i* q；
The voltage outer ring control structure comprises two outer ring PI regulators, and the tracking of the direct current output voltage to the reference voltage is realized through the connection of the two outer ring PI regulators.
Optionally, the voltage outer-loop control structure includes two outer-loop PI regulators, and the two outer-loop PI regulators are connected to track the reference voltage by the dc output voltage.
Optionally, the power controller adopts a double closed loop control manner of a current inner loop at the side of a direct-current voltage outer ring network under a dq synchronous rotation coordinate system, that is, a double closed loop control manner of an output voltage outer ring inductance current inner loop.
Optionally, the present invention provides a control method of a power controller with constant power closed-loop control, including:
Step 2, e of step 1a、ebLeading in a phase-locked loop to obtain a network side voltage phase theta;
step 3, collecting the voltage V of the load sidedcAnd comparing the output voltage with a target set, adjusting the error of the output voltage by a voltage outer ring PI controller, and outputting the output voltage as a set of a current inner ring d axis, wherein the voltage outer ring is used for realizing feedback control of the output voltage.
Step 4, current i on the network side is measureda、ib、icSampling, and obtaining components of current on a d axis and a q axis through d conversion, wherein the d axis is an active component, and the q axis is a reactive component; will real d-axis current component idComparing with a target given value, and sending the error of the target given value to a d-axis current inner loop PI controller; q-axis current iqMaking a difference with the target value 0, and sending the error to a q-axis current inner loop PI controller; decoupling and dq inverse transformation are carried out on the dq axis current loop, a target modulation wave is obtained, and a PWM control signal is obtained through an SVPWM module; by passingReal-time tracking and maximum current limiting for a given voltage are realized, and maximum constant control over power output is realized.
Optionally, the power controller with constant power closed-loop control is characterized in that the current loop output current value i is enabled to be equal to the current upper limit valuedApproaches to a given value i* dMaximum constant control of power output is achieved by achieving real-time tracking and maximum current clipping for a given voltage.
The invention has the beneficial effects that:
1. the voltage outer ring control structure in the technical scheme of the invention can effectively clamp the output voltage and realize the real-time tracking of the target voltage. The fluctuation value of the output voltage is small, and the response tracking speed is high.
2. The technical scheme of the invention adopts a current inner loop control structure, so that the output current is high in quality, harmonic components in the current are effectively inhibited, and the maximum target current value is fully limited, so that the constant power control effect is achieved when the current limiting value is applied to the load side.
3. According to the technical scheme, the decoupled SVPWM is adopted to drive and control the inverter, so that the integration level is high, the cost is low, and the control precision and stability are high.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a flow chart of a constant power control according to the present invention;
FIG. 2 is a block diagram of a constant power closed loop controlled power controller according to the present invention;
FIG. 3 is a block diagram of the rectifier current inner loop control transfer function of the present invention;
FIG. 4 is a block diagram of the transfer function of the rectifier voltage outer loop control of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a power controller for constant power closed-loop control, as shown in fig. 2: the SVPWM driving circuit comprises a current inner ring control structure, a voltage outer ring control structure, an SVPWM driving module and an inverter circuit. The SVPWM driving module respectively obtains control signals with the current inner ring control structure and the voltage outer ring control structure; the inverter circuit is connected with the SVPWM driving module to obtain a driving signal.
The current inner loop control structure comprises a sampling conversion module, a phase-locked loop module, a dq conversion module and a PI regulator. The phase-locked loop module is connected with the sampling conversion module, and the voltage signal output by the sampling conversion module under the static coordinate system is decoupled to output current angle information of the three-phase network side; the dq conversion module is connected with the sampling conversion module and used for decoupling the inner loop control current parameter; the PI regulator is connected with the dq conversion module and is used for regulating an inner loop control current parameter iqTo a nominal maximum value i* q. The voltage outer ring control structure comprises two outer ring PI regulators, and the tracking of the direct current output voltage to the reference voltage is realized through the connection of the two outer ring PI regulators.
The power controller adopts a double closed loop control mode of a current inner ring at the side of a direct-current voltage outer ring network under a dq synchronous rotation coordinate system, namely a double closed loop control mode of an output voltage outer ring inductance current inner ring, as shown in fig. 1, and specifically comprises the following steps:
step S10, collecting a network side current signal ia、ib、ic. Collecting network side voltage signal ea、eb、ecConverting the three-phase network side voltage signal into a voltage signal e under a two-phase static coordinate systemα，eβ。
Step S20, e in step S10a、ebIntroducing a phase-locked loopTaking a network side voltage phase theta;
step S30, collecting the voltage V of the load sidedcAnd comparing with a target set, adjusting the error of the target set by a voltage outer ring PI controller, outputting the error as a set of a current inner ring d axis, and realizing feedback control on output voltage by a voltage outer ring;
the block diagram of the transfer function of the rectifier voltage outer loop control is shown in fig. 3. When the voltage outer ring is designed, the main aim is to realize stable tracking of the direct current side voltage to the reference setting and expect that the voltage outer ring has good anti-jamming capability.
Wherein, the voltage outer loop open loop transfer function:
wherein the intermediate frequency bandwidth hvSatisfy the requirement of
Comprehensively considering the tracking performance and the anti-interference capability of the system, h is usually taken as a reference in engineeringvAs 5, we can get:
h is to bevThe controller parameters can end up being 5 substituted:
the amplitude of the feedback voltage at the load side is monitored while real-time tracking of the given voltage is realized through voltage outer ring control, and the stable control of the voltage is realized through adjusting PWM (pulse width modulation) ratio parameters.
Step S40, comparing the network side current ia、ib、icSampling, and obtaining by d conversionThe components of the current on a d axis and a q axis, wherein the d axis is an active component, and the q axis is a reactive component; will real d-axis current component idComparing with a target given value, and sending the error of the target given value to a d-axis current inner loop PI controller; q-axis current iqMaking a difference with the target value 0, and sending the error to a q-axis current inner loop PI controller; and decoupling and dq inverse transformation are carried out on the dq axis current loop to obtain a target modulation wave, and a PWM control signal is obtained through an SVPWM module.
The block diagram of the rectifier current inner loop control transfer function is shown in fig. 4: wherein, KPWMFor the PWM equivalent gain factor, the value is usually 1. e.g. of the typeaThe current loop closed loop transfer function is:
namely, the current loop can output a current value i by setting a current upper limit valuedApproaches to a given value i* dWhen the switching frequency is high, the dynamic response speed of the current inner loop is high. By enabling real-time tracking and maximum current limiting for a given voltage, the present invention enables maximum constant control of power output.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details shown and described herein without departing from the general concept defined by the claims and their equivalents.
Claims (6)
1. A constant power closed loop controlled power controller, comprising: the device comprises a current inner ring control structure, a voltage outer ring control structure, an SVPWM driving module and an inverter circuit;
the SVPWM driving module is respectively connected with the current inner ring control structure and the voltage outer ring control structure and is used for acquiring a control signal; the inverter circuit is connected with the SVPWM driving module and used for obtaining a driving signal and realizing constant power output through the inverter circuit.
2. The constant-power closed-loop-controlled power controller of claim 1, wherein the current inner loop control structure comprises a sampling transformation module, a phase-locked loop module, a dq transformation module, and a PI regulator;
the phase-locked loop module is connected with the sampling transformation module, and the sampling transformation module is used for decoupling the voltage signal output by the sampling transformation module under the static coordinate system and outputting the current angle information of the three-phase network side;
the dq conversion module is connected with the sampling conversion module and used for decoupling the inner loop control current parameter;
the PI regulator is connected with the dq conversion module and is used for regulating an inner loop control current parameter iqTo a nominal maximum value i* q。
3. The constant-power closed-loop-controlled power controller according to claim 1, wherein the voltage outer-loop control structure comprises two outer-loop PI regulators, and the two outer-loop PI regulators are connected to track the reference voltage by the dc output voltage.
4. The power controller with constant power closed-loop control according to claim 3, wherein the power controller adopts a double closed-loop control mode of the current inner loop at the side of the direct-current voltage outer loop network under the dq synchronous rotation coordinate system, namely a double closed-loop control mode of the output voltage outer loop inductance current inner loop.
5. The constant power closed loop controlled power controller of claim 4, wherein the power control method of the power controller comprises the steps of:
step 1, collecting a network side current signal ia、ib、ic(ii) a Collecting network side voltage signal ea、eb、ecConverting the three-phase network side voltage signal into a voltage signal e under a two-phase static coordinate systemα，eβ；
Step 2, e of step 1α，eβLeading in a phase-locked loop to obtain a network side voltage phase theta;
step 3, collecting the voltage V of the load sidedcAnd comparing with a target set, adjusting the error of the target set by a voltage outer ring PI controller, outputting the error as a set of a current inner ring d axis, and realizing feedback control on output voltage by a voltage outer ring;
step 4, current i on network sidea、ib、icSampling, and obtaining components of current on a d axis and a q axis through d conversion, wherein the d axis is an active component, and the q axis is a reactive component; will real d-axis current component idComparing with a target given value, and sending the error of the target given value to a d-axis current inner loop PI controller; q-axis current iqMaking a difference with the target value 0, and sending the error to a q-axis current inner loop PI controller; and decoupling and dq inverse transformation are carried out on the dq axis current loop to obtain a target modulation wave, and a PWM control signal is obtained through an SVPWM module.
6. The constant-power closed-loop-controlled power controller of claim 5, wherein the current loop output current value i is set by setting a current upper limit valuedApproaches to a given value i* dMaximum constant control of power output is achieved by achieving real-time tracking and maximum current clipping for a given voltage.
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| US20180091037A1 (en) * | 2016-01-27 | 2018-03-29 | Southeast University | Four-port power electronic transformer based on hybrid modular multilevel converter |
| US20190312521A1 (en) * | 2018-04-05 | 2019-10-10 | Nanyang Technological University | Dual voltage and current loop linearization control and voltage balancing control for solid state transformer |
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2020
- 2020-12-31 CN CN202011619114.6A patent/CN112737386A/en active Pending
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| CN102412593A (en) * | 2011-11-02 | 2012-04-11 | 哈尔滨九洲电气股份有限公司 | Grid-connected generation control method for photovoltaic power generation converter |
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