CN112415887A - Voltage loop control method and system of full-quadrant converter considering power loss - Google Patents
Voltage loop control method and system of full-quadrant converter considering power loss Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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Abstract
The embodiment of the invention provides a voltage loop control method and system of a full-quadrant converter considering power loss, and belongs to the technical field of control of voltage loops of converters. The voltage loop control method comprises the following steps: obtaining system parameters of a converter system, wherein the system parameters comprise a direct current side voltage reference u of the converterDC *Input power PinOutput power PoutD.c. side current iDCAnd an equivalent loss resistance Rloss(ii) a According to the output power PoutDetermining a current reference id *(ii) a According to the current reference id *Determining a transform coefficient K1And a transform coefficient K2(ii) a According to the transformation coefficient K1Determining a state feedback coefficient K of a voltage loop of the convertersf(ii) a According to the transformation coefficient K1Determining a ratio of PI controllers of the voltage loopExample coefficient Kp(ii) a According to the proportionality coefficient KpDetermining an integral coefficient K of the PI controlleri(ii) a The state feedback coefficient K is measuredsfCoefficient of proportionality KpAnd an integral coefficient KiUpdating into the voltage loop to control the voltage loop.
Description
Technical Field
The invention relates to the technical field of control of a converter voltage loop, in particular to a voltage loop control method and system of a full-quadrant converter considering power loss.
Background
For a full-quadrant operation AC/DC grid-connected converter, besides performing active power energy interaction and providing reactive power support with a power grid on an AC side, it is often necessary to control the stabilization of a DC side voltage so as to maintain the stabilization of a DC bus. Therefore, on the basis of controlling the system current inner loop, a voltage outer loop is added to realize the voltage stabilization control of the direct current voltage, and the power at the direct current end of the converter is active power, so that the applied voltage outer loop is the outer loop of the active current inner loop.
In the control process of the voltage loop, the state feedback coefficient KsfCoefficient of proportionality KpAnd an integral coefficient KiIs the most common key parameter. For the traditional voltage loop control method, the influence of power loss in a circuit is not considered during parameter design, so that the designed parameters can realize ideal voltage stabilization performance only under the condition that the power loss of the circuit is extremely small. In a practical application scenario, power loss of the converter cannot be ignored, and parameters designed by a traditional design scheme can cause actual dynamic and steady-state performance of a voltage loop to be inconsistent with a theoretical design target.
In addition, when the converter operates in full quadrant, the active current is not 0, and the reactive current also causes the loss of the circuit, which causes the performance of the converter voltage loop to change with the difference of the operating quadrants under the traditional control method, which causes the stability and reliability of the system to be reduced.
Disclosure of Invention
The invention aims to provide a voltage loop control method and a system of a full-quadrant converter considering power loss, wherein the voltage loop control method and the system control a state feedback coefficient K when a voltage loop is controlled by correctingsfCoefficient of proportionality KpAnd an integral coefficient KiThe technical defects of poor stability and reliability caused by inaccurate coefficient determination in the prior art are overcome.
In order to achieve the above object, an embodiment of the present invention provides a voltage loop control method for a full-quadrant converter in which power loss is taken into account, the voltage loop control method including:
obtaining system parameters of a converter system, wherein the system parameters comprise a direct current side voltage reference u of the converterDC *Input power PinOutput power PoutD.c. side current iDCAnd an equivalent loss resistance Rloss；
According to the output power PoutDetermining a current reference id *；
According to the current reference id *Determining a transform coefficient K1And a transform coefficient K2；
According to the transformation coefficient K1Determining a state feedback coefficient K of a voltage loop of the convertersf；
According to the transformation coefficient K1Determining a proportionality coefficient K of a PI controller of the voltage loopp；
According to the proportionality coefficient KpDetermining an integral coefficient K of the PI controlleri；
The state feedback coefficient K is measuredsfCoefficient of proportionality KpAnd an integral coefficient KiUpdating into the voltage loop to control the voltage loop.
Optionally, the acquiring the system parameter of the converter system specifically includes:
reading the DC side voltage reference u by the converter systemDC *；
Passing powerThe analyzer obtains the input power PinAnd the output power Pout；
Obtaining the current i at the direct current side through a current sensor preset at the direct current side of the converter systemDC；
Calculating the equivalent loss resistance R according to formula (1)loss，
Wherein idAnd iqThe three-phase alternating current of the converter is subjected to coordinate transformation.
Optionally, according to the output power PoutDetermining a current reference id *The method specifically comprises the following steps:
determining the current reference i according to equation (2)d *，
Wherein e isdThe active component of the grid voltage where the converter is located.
Optionally, according to the current reference id *Determining a transform coefficient K1And a transform coefficient K2The method specifically comprises the following steps:
determining the transformation coefficient K according to equation (3)1And a transform coefficient K2，
Optionally, according to the transformation coefficient K1Determining a state feedback coefficient K of a voltage loop of the convertersfThe method specifically comprises the following steps:
determining the state feedback coefficient K according to equation (4)sf，
And C is the direct current side capacitance of the converter.
Optionally, according to the transformation coefficient K1Determining a proportionality coefficient K of a PI controller of the voltage looppThe method specifically comprises the following steps:
determining the proportionality coefficient K according to equation (5)p，
Optionally according to the proportionality coefficient KpDetermining an integral coefficient K of the PI controlleriThe method specifically comprises the following steps:
calculating the integral coefficient K according to equation (6) and equation (7)i，
Wherein ξVLIs the damping coefficient, omega, of the second order system of the converternIs the natural frequency of the second order system.
In another aspect, the present invention also provides a voltage loop control system of a full-quadrant converter taking power loss into account, the system comprising a processor configured to perform the voltage loop control method as described in any one of the above.
In yet another aspect, the present disclosure also provides a storage medium storing instructions for reading by a machine to cause the machine to perform any of the voltage loop control methods described above.
Through the technical scheme, the voltage loop control method and the system of the full-quadrant converter considering the power loss, provided by the invention, have the advantages that the influence factor of the power loss in the circuit is introduced when the key control parameter of the voltage loop is determined, the technical defect of poor stability and reliability caused by inaccurate coefficient determination in the prior art is overcome, and the stability and the reliability of the converter system are improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow diagram of a voltage loop control method of a full-quadrant converter that accounts for power losses, according to one embodiment of the present invention;
figure 2 is a schematic diagram of a voltage ring according to one embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" is generally used with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a voltage loop control method of a full-quadrant converter in consideration of power loss according to an embodiment of the present invention. In fig. 1, the voltage loop control method may include:
in step S10, system parameters of the converter system are acquired. The system parameter may include a dc-side voltage reference u of the converterDC *Input power PinOutput power PoutD.c. side current iDCAnd an equivalent loss resistance Rloss. Specifically, a voltage ring structure as shown in fig. 2 is taken as an example. In this step S10, the dc-side voltage reference u can be read directly by the converter systemDC *. For input power PinAnd the output power PoutAnd may be obtained by a power analyzer. For direct side current iDCThe current can be obtained by a current sensor preset on the dc side of the converter system. For equivalent loss resistance RlossIt can be calculated according to equation (1),
wherein idAnd iqThe three-phase alternating current of the converter is subjected to coordinate transformation.
In step S11, the output power P is usedoutDetermining a current reference id *. In particular, the current reference i may be determined according to equation (2)d *，
Wherein e isdIs the active component of the grid voltage in which the converter is located. In more application scenarios, the active component may be 311V.
In step S12, according to the current reference id *Determining a transform coefficient K1And a transform coefficient K2. Specifically, the transform coefficient K may be determined according to formula (3)1And a transform coefficient K2，
In step S13, a transform coefficient K is used1Determining a state feedback coefficient K of a voltage loop of a convertersf. In the voltage loop shown in fig. 2, in the conventional state, the transfer function of the voltage loop may be the formula (4-a),
wherein s is a laplace operator.
Without state feedback, i.e. when the state feedback coefficient KsfWhen 0, the transfer function of the voltage loop may be formula (4-b),
it can be seen from the equation (4-b) that without state feedback, the voltage loop is a second order system with a zero. Then, in this embodiment, the state feedback coefficient K may be introduced in order to eliminate the zero point to improve the dynamic performance of the voltage loopsf。
In the introduction of state feedback coefficient KsfIn the case of (2), the voltage loop should satisfy the correspondence of the formula (4-c),
wherein,
is a time constant. The voltage loop is reduced to a first order system by collating the formula (4-c), thereby obtaining a formula (4-d),
and C is the direct current side capacitor of the converter. Therefore, the step S13 can also be expressed as determining the state feedback coefficient K according to the formula (4-d)sf。
In step S14, a transform coefficient K is used1Determining a proportionality coefficient K of a PI controller of a voltage loopp. Specifically, the scaling factor K may be determined according to formula (5)p，
In step S15, the scaling factor K is usedpDetermining an integral coefficient K of a PI controlleri. In this embodiment, since the formula (4-d) gives only the state feedback coefficient KsfCoefficient of proportionality KpAnd integral coefficient KiThe corresponding relationship of (a) and (b) cannot be calculated. Therefore, the calculation of the combination formula (4-b) is required. In the calculation process, a damping coefficient xi of a second-order system of the voltage loop can be introducedVLAnd natural frequency omegan. Specifically, it can be expressed by the formula (6) and the formula (7),
wherein for the damping coefficient ξVLThe damping coefficient xi can be determined according to the condition of the actual converter system, and in more application scenes, the damping coefficient xi isVLMay be 0.707.
In step S16, the state feedback coefficient K is setsfCoefficient of proportionality KpAnd an integral coefficient KiAnd updating the voltage ring to control the voltage ring.
In another aspect, the present invention also provides a voltage loop control system of a full-quadrant converter that accounts for power losses, which may include a processor configured to perform the voltage loop control method as described in any one of the above.
In yet another aspect, the present disclosure also provides a storage medium that may store instructions that are readable by a machine to cause the machine to perform any of the voltage loop control methods described above.
Through the technical scheme, the voltage loop control method and the system of the full-quadrant converter considering the power loss, provided by the invention, have the advantages that the influence factor of the power loss in the circuit is introduced when the key control parameter of the voltage loop is determined, the technical defect of poor stability and reliability caused by inaccurate coefficient determination in the prior art is overcome, and the stability and the reliability of the converter system are improved.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the method for implementing the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, various different embodiments of the present invention may be arbitrarily combined with each other, and the embodiments of the present invention should be considered as disclosed in the disclosure of the embodiments of the present invention as long as the embodiments do not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A voltage loop control method for a full-quadrant converter that accounts for power losses, the voltage loop control method comprising:
obtaining system parameters of a converter system, wherein the system parameters comprise a direct current side voltage reference u of the converterDC *Input power PinOutput power PoutD.c. side current iDCAnd an equivalent loss resistance Rloss；
According to the output power PoutDetermining a current reference id *；
According to the current reference id *Determining a transform coefficient K1And a transform coefficient K2；
According to the transformation coefficient K1Determining a state feedback coefficient K of a voltage loop of the convertersf；
According to the transformation coefficient K1Determining a proportionality coefficient K of a PI controller of the voltage loopp；
According to the proportionality coefficient KpDetermining an integral coefficient K of the PI controlleri；
The state feedback coefficient K is measuredsfCoefficient of proportionality KpAnd an integral coefficient KiUpdating into the voltage loop to control the voltage loop.
2. The voltage loop control method according to claim 1, wherein the acquiring system parameters of the converter system specifically comprises:
reading the DC side voltage reference u by the converter systemDC *；
Obtaining the input power P by a power analyzerinAnd the output power Pout；
Obtaining the current i at the direct current side through a current sensor preset at the direct current side of the converter systemDC；
Calculating the equivalent loss resistance R according to formula (1)loss，
Wherein idAnd iqThe three-phase alternating current of the converter is subjected to coordinate transformation.
3. Voltage loop control method according to claim 1, characterized in that it is dependent on the output power PoutDetermining a current reference id *The method specifically comprises the following steps:
determining the current reference i according to equation (2)d *，
Wherein e isdThe active component of the grid voltage where the converter is located.
4. The voltage loop control method of claim 1, wherein i is based on the current referenced *Determining a transform coefficient K1And a transform coefficient K2The method specifically comprises the following steps:
determining the transformation coefficient K according to equation (3)1And a transform coefficient K2，
5. Voltage loop control method according to claim 1, characterized in that it is based on said transformation coefficient K1Determining a state feedback coefficient K of a voltage loop of the convertersfThe method specifically comprises the following steps:
determining the state feedback coefficient K according to equation (4)sf，
And C is the direct current side capacitance of the converter.
6. Voltage loop control method according to claim 1, characterized in that it is based on said transformation coefficient K1Determining a proportionality coefficient K of a PI controller of the voltage looppThe method specifically comprises the following steps:
determining the proportionality coefficient K according to equation (5)p，
7. Voltage loop control method according to claim 5, characterized in that it is dependent on said proportionality coefficient KpDetermining an integral coefficient K of the PI controlleriThe method specifically comprises the following steps:
calculating the integral coefficient K according to equation (6) and equation (7)i，
Wherein ξVLIs the damping coefficient, omega, of the second order system of the converternIs the natural frequency of the second order system.
8. A voltage loop control system of a full-quadrant converter taking into account power losses, characterized in that it comprises a processor configured to perform the voltage loop control method according to any one of claims 1 to 7.
9. A storage medium storing instructions for reading by a machine to cause the machine to perform a voltage loop control method according to any one of claims 1 to 7.
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| CN117674173A (en) * | 2023-12-19 | 2024-03-08 | 安徽拓界电源科技有限公司 | DC side voltage stabilizing strategy and system of inverter |
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