CN115912341A - Power flow control method based on unified power quality controller - Google Patents
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Abstract
The invention provides a power flow control method based on a unified power quality controller, wherein the unified power quality controller comprises a pre-stage parallel converter, a post-stage series converter and an intermediate-stage direct current link, and the power flow control method comprises a series converter control method and a parallel converter control method. The invention can realize accurate and effective power flow control of the power grid system, thereby greatly improving the quality of electric energy.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a power flow control method based on a unified power quality controller.
Background
With the increasingly prominent energy and environmental problems and the continuous development of the society, the power system faces more new challenges, for example, the installed scale of new energy such as photovoltaic wind power is greatly increased, and the power grid faces the following problems in the development process: the new energy has volatility and randomness, and the incoming calls outside the region change seasonally, so that the power grid has uneven power flow distribution, insufficient transmission capacity of a key transmission section, complicated and variable power flow, difficulty in control and insufficient dynamic reactive power support capacity.
Therefore, it is necessary to provide an effective scheme for controlling the power flow of the power grid and improving the power quality.
Disclosure of Invention
The invention provides a power flow control method based on a unified power quality controller to solve the technical problems, and the power flow control method can realize accurate and effective power flow control on a power grid system, thereby greatly improving the power quality.
The technical scheme adopted by the invention is as follows:
a power flow control method based on a unified power quality controller, wherein the unified power quality controller comprises a pre-stage parallel converter, a post-stage series converter and an intermediate-stage direct-current link, the power flow control method comprises a series converter control method and a parallel converter control method, and the series converter control method comprises the following steps: setting reference active power and reference reactive power of a line at the output side of the series converter, and calculating a d-axis current reference value and a q-axis current reference value of the line at the output side of the series converter according to instantaneous complex power definition; detecting the actual current of the output side line of the series converter, and decomposing to obtain a d-axis current actual value and a q-axis current actual value of the output side line of the series converter; according to a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of a line on an output side of the series converter, calculating by using a control equation under a dq coordinate system of a series converter terminal to obtain a first d-axis voltage component and a first q-axis voltage component, and generating a signal for driving the series converter according to the first d-axis voltage component and the first q-axis voltage component so as to drive the series converter to output a compensation voltage with controllable phase angle and amplitude, wherein the parallel converter control method comprises the following steps of: setting reference active power and reference reactive power of a line at the input side of a parallel converter, and calculating a q-axis current reference value of the line at the input side of the parallel converter according to instantaneous complex power definition; setting a reference voltage of the direct-current link, detecting an actual voltage of the direct-current link, and acquiring a d-axis current reference value of a line on the input side of the parallel converter according to the reference voltage and the actual voltage of the direct-current link; detecting the actual current of the input side line of the parallel converter, and decomposing to obtain the d-axis current actual value and the q-axis current actual value of the input side line of the parallel converter; and calculating a second d-axis voltage component and a second q-axis voltage component by using a control equation under a dq coordinate system of the parallel converter end according to the d-axis current reference value, the d-axis current actual value, the q-axis current reference value and the q-axis current actual value of the input side line of the parallel converter, and generating a signal for driving the parallel converter according to the second d-axis voltage component and the second q-axis voltage component so as to drive the parallel converter to output a compensation current with controllable phase angle and amplitude.
The discrete form of the control equation in the dq coordinate system at the end of the series converter is as follows:
wherein, V sd And V sq Respectively representing a first d-axis voltage component and a first q-axis voltage component, V 1d And V 1q Respectively representing the d-and q-axis components, V, of the grid voltage 2d And V 2q Representing the d-and q-axis components of the load voltage, I, respectively sd *、I sd 、I sq * And I sq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of the output side line of the series converter, R s Representing the equivalent resistance, L, of the line on the output side of the series converter s Representing the equivalent inductance, T, of the line on the output side of the series converter s Representing discrete sampling periodsω represents the grid system angular frequency, k represents the current time, and k +1 represents the next time.
The discrete form of the control equation under the dq coordinate system of the parallel converter terminal is as follows:
wherein, V pd And V pq Respectively representing a second d-axis voltage component and a second q-axis voltage component, V 1d And V 1q Respectively representing the d-and q-axis components of the grid voltage, I pd *、I pd 、I pq * And I pq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of the input side line of the parallel converter, R p Representing the equivalent resistance, L, of the input-side line of the parallel converter p Representing the equivalent inductance, T, of the input-side line of the parallel converter s And the discrete sampling period is represented, omega represents the angular frequency of the power grid system, k represents the current moment, and k +1 represents the next moment.
Obtaining a d-axis current reference value of the input side line of the parallel converter according to the reference voltage and the actual voltage of the direct current link, specifically comprising: and (3) making a difference between the actual voltage of the direct current link and the reference voltage, inputting the difference into a PI controller, and obtaining a d-axis current reference value of the input side circuit of the parallel converter through PI control.
Wherein SVPWM control is performed according to the first d-axis voltage component and the first q-axis voltage component to generate a PWM signal for driving the series converter.
And performing SVPWM control according to the second d-axis voltage component and the second q-axis voltage component to generate a PWM signal for driving the parallel converter.
The invention has the beneficial effects that:
according to the power flow control method based on the unified power quality controller, the series converter and the parallel converter are respectively controlled according to the parameters of the circuit on the output side of the series converter and the parameters of the circuit on the input side of the parallel converter, so that accurate and effective power flow control of a power grid system can be realized, and the power quality is greatly improved.
Drawings
FIG. 1 is a topology diagram of a power grid system including a unified power quality controller in accordance with an embodiment of the present invention;
FIG. 2 is an equivalent circuit diagram of a power grid system including a unified power quality controller according to an embodiment of the present invention;
FIG. 3 is a flow chart of a unified power quality controller based power flow control method according to an embodiment of the present invention;
fig. 4 is a control architecture diagram corresponding to a series converter control method according to an embodiment of the present invention;
fig. 5 is a control architecture diagram corresponding to a parallel converter control method according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the unified power quality controller according to the embodiment of the present invention is applied to a three-phase power grid system, which is disposed between a three-phase power grid and a load, and the three-phase power grid system further includes a multi-winding transformer and a necessary bypass switch. The unified power quality controller comprises a pre-stage parallel converter, a post-stage series converter and a middle-stage direct current link, the multi-winding transformer comprises three windings, a winding 1 is a primary side three-phase input winding and is respectively connected with a three-phase input power grid, a winding 2 and a winding 3 are secondary side output windings, the winding 2 is used for being connected with a load, and the winding 3 is used as an input winding of the series-parallel converter and an input winding of the parallel-series converter to provide power input for the power electronic converter through a filter inductor. The alternating current side of the preceding stage parallel converter is connected with the output side of the winding 3 through the filter inductor, which is equivalent to a three-phase full bridge rectifier, so that the rectification process from alternating current to direct current is realized, and the parallel converter can realize real-time reactive current compensation. The rear-stage series converter comprises three single-phase full-bridge inverters, the output ends of the three single-phase full-bridge inverters are connected with three phase lines of a load through corresponding LC filter circuits respectively, and the series converters can be connected in series into a three-phase power grid in a capacitance coupling mode respectively to achieve real-time voltage compensation. The intermediate-stage direct-current link maintains voltage stability in a capacitive energy storage mode and is a place for energy exchange and alternating current-direct current conversion.
As shown in FIG. 2, the parallel converter and the series converter can be respectively equivalent to a controllable current source I p And a controllable voltage source V s In the figure, V 1 Representing a three-phase network, V 2 The equivalent resistance and the equivalent inductance of the input side line of the parallel converter representing the load are respectively R p 、L p The equivalent resistance and the equivalent inductance of the output side line of the series converter are respectively R s 、L s . The implementation of the embodiment of the invention is equivalent to the control scheme of the power flow control method of the invention for the controllable current source I p And a controllable voltage source V s And (5) controlling.
The power flow control method based on the unified power quality controller comprises a series converter control method and a parallel converter control method.
As shown in fig. 3, the series converter control method includes:
and S11, setting reference active power and reference reactive power of a line at the output side of the series converter, and calculating a d-axis current reference value and a q-axis current reference value of the line at the output side of the series converter according to the instantaneous complex power definition.
And S12, detecting the actual current of the output side line of the series converter, and decomposing to obtain the d-axis current actual value and the q-axis current actual value of the output side line of the series converter.
And S13, calculating a first d-axis voltage component and a first q-axis voltage component by using a control equation under a dq coordinate system of the output side of the series converter according to the d-axis current reference value, the d-axis current actual value, the q-axis current reference value and the q-axis current actual value of the line of the output side of the series converter, and generating a signal for driving the series converter according to the first d-axis voltage component and the first q-axis voltage component so as to drive the series converter to output a compensation voltage with controllable phase angle and amplitude.
In an embodiment of the present invention, a control architecture corresponding to the series converter control method is shown in fig. 4.
In one embodiment of the invention, the reference line power flow, i.e. the reference active power P and the reference reactive power Q, of the series converter can be set according to the load condition of the line on the output side of the series converter.
The instantaneous complex power is defined as:
from the instantaneous complex power definition, the calculation of the d-axis current reference and the q-axis current reference can be obtained:
wherein, I d * And I q * Respectively representing d-axis and q-axis current reference values, V d And V q Respectively representing d-axis voltage and q-axis voltage, V d And V q Can be obtained by detection.
After the reference active power P and the reference reactive power Q of the output side circuit of the series converter are set, and the d-axis voltage and the Q-axis voltage of the output side circuit of the series converter are obtained through detection and conversion, the d-axis current reference value I of the output side circuit of the series converter can be calculated according to the calculation formula sd * And q-axis current reference value I sq *。
As shown in FIG. 4, the d-axis current parameter of the output side line of the series converter is calculatedExamination value I sd * And q-axis current reference value I sq * And obtaining the d-axis current actual value I of the output side line of the series converter through detection and conversion sd And the actual value of q-axis current I sq Then, calculation can be carried out by utilizing a control equation under a dq coordinate system at the end of the series converter to obtain a first d-axis voltage component V sd And a first q-axis voltage component V sq . The control equation under the dq coordinate system at the end of the series converter is as follows:
discretizing the equation by adopting a forward difference method, and obtaining a discrete form of a control equation under a dq coordinate system at the end of the series converter as follows:
wherein, V sd And V sq Respectively representing a first d-axis voltage component and a first q-axis voltage component, V 1d And V 1q Respectively representing the d-and q-axis components, V, of the grid voltage 2d And V 2q Representing the d-and q-axis components of the load voltage, I, respectively sd *、I sd 、I sq * And I sq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of a line at the output side of the series converter, R s Representing the equivalent resistance, L, of the line on the output side of the series converter s Representing the equivalent inductance, T, of the line on the output side of the series converter s And the discrete sampling period is represented, omega represents the angular frequency of the power grid system, k represents the current moment, and k +1 represents the next moment.
In the embodiment of the present invention, the set reference value is used as the predicted value of the next time, that is, the d-axis current reference value and the q-axis current reference value of the line on the output side of the series converter are calculated according to the set reference active power and the set reference reactive power, and the d-axis current reference value and the q-axis current reference value are used as the predicted values of the next time, and the d-axis current reference value and the q-axis current reference value are used as the predicted values of the line on the output side of the series converterCurrent reference value and q-axis current reference value I sd *、I sq * And (6) performing calculation.
The calculated first d-axis voltage component V sd And a first q-axis voltage component V sq Is the amount used to achieve voltage compensation. As shown in fig. 4, may be based on the first d-axis voltage component V sd And a first q-axis voltage component V sq Performing SVPWM control to generate PWM signal S for driving series converter Ba 、S Bb 、S Bc The phase-change bridge driving circuit is used for driving the switching tubes of the phase-change bridges a, b and c in the series converter respectively to enable the series converter to output compensation voltage with controllable phase angle and amplitude, and therefore control over the power flow of a circuit on the output side of the series converter is achieved.
As shown in fig. 3, the parallel converter control method includes:
and S21, setting reference active power and reference reactive power of the input side line of the parallel converter, and calculating a q-axis current reference value of the input side line of the parallel converter according to the instantaneous complex power definition.
And S22, setting a reference voltage of the direct current link, detecting an actual voltage of the direct current link, and acquiring a d-axis current reference value of the input side circuit of the parallel converter according to the reference voltage and the actual voltage of the direct current link.
And S23, detecting the actual current of the input side line of the parallel converter, and decomposing to obtain the d-axis current actual value and the q-axis current actual value of the input side line of the parallel converter.
And S24, according to the d-axis current reference value, the d-axis current actual value, the q-axis current reference value and the q-axis current actual value of the input side line of the parallel converter, calculating by using a control equation under a dq coordinate system of the parallel converter end to obtain a second d-axis voltage component and a second q-axis voltage component, and generating a signal for driving the parallel converter according to the second d-axis voltage component and the second q-axis voltage component so as to drive the parallel converter to output a compensation current with controllable phase angle and amplitude.
In an embodiment of the present invention, a control architecture corresponding to the parallel converter control method is shown in fig. 5.
Parallel converter input side line in step S21The q-axis current reference value of (2) is calculated in the same manner as the q-axis current reference value of the output side line of the series converter in step S11. Namely, after the reference active power and the reference reactive power of the input side line of the parallel converter are set according to the load condition of the input side line of the parallel converter, the d-axis voltage and the q-axis voltage of the input side line of the parallel converter are obtained through detection and conversion, and then the q-axis current reference value I of the input side line of the parallel converter can be calculated according to the calculation formula of the q-axis current reference value pq *。
Meanwhile, a reference voltage U of the DC link is set dc * And detecting the actual voltage U of the DC link dc And a reference voltage U according to the DC link dc * And the actual voltage U dc Obtaining d-axis current reference value I of input side line of parallel converter pd *。
As shown in fig. 5, the actual voltage U of the dc link can be adjusted dc And a reference voltage U dc * And performing PI control to obtain d-axis current reference value I of input side line of parallel converter pd * . Calculating a d-axis current reference value I of an input side line of the parallel converter pd * And q-axis current reference value I pq * And obtaining the d-axis current actual value I of the input side circuit of the parallel converter through detection and conversion pd And the actual value of q-axis current I pq Then, calculation can be carried out by utilizing a control equation under a dq coordinate system at the end of the parallel converter to obtain a second d-axis voltage component V pd And a second q-axis voltage component V pq . The control equation under the dq coordinate system of the parallel converter terminal is as follows:
discretizing the equation by adopting a forward difference method, wherein the discrete form of the control equation under the dq coordinate system at the parallel converter end is obtained by:
wherein, V pd And V pq Respectively representing a second d-axis voltage component and a second q-axis voltage component, V 1d And V 1q Representing the d-and q-axis components, I, of the grid voltage, respectively pd *、I pd 、I pq * And I pq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of a line at the input side of the parallel converter, R p Representing the equivalent resistance, L, of the input-side line of the parallel converter p Representing the equivalent inductance, T, of the input-side line of the parallel converter s And the discrete sampling period is represented, omega represents the angular frequency of the power grid system, k represents the current moment, and k +1 represents the next moment.
In the embodiment of the present invention, the set reference value is used as the predicted value of the next time, that is, the q-axis current reference value of the input-side line of the parallel converter is calculated according to the set reference active power and the set reference reactive power, the d-axis current reference value of the input-side line of the parallel converter is calculated according to the set reference voltage of the dc link, and the d-axis current reference value and the q-axis current reference value I are used pd *、I pq * And (4) performing calculation.
The calculated second d-axis voltage component V pd And a second q-axis voltage component V pq Is a quantity used to implement current compensation. As shown in fig. 5, may be based on the second d-axis voltage component V pd And a second q-axis voltage component V pq Performing SVPWM control to generate PWM signal for driving parallel converter, S Ea 、S Eb 、S Ec The phase-change bridge driving circuit is used for driving the switching tubes of the phase-change bridges a, b and c in the parallel converter respectively to enable the parallel converter to output compensating current with controllable phase angle and amplitude, and therefore control over the line power flow at the input side of the parallel converter is achieved.
According to the power flow control method based on the unified power quality controller, the parameters of the output side circuit of the series converter and the parameters of the input side circuit of the parallel converter are used for respectively controlling the series converter and the parallel converter, so that accurate and effective power flow control of a power grid system can be realized, and the power quality is greatly improved.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless explicitly defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A power flow control method based on a unified power quality controller is characterized in that the unified power quality controller comprises a pre-stage parallel converter, a post-stage series converter and an intermediate-stage direct current link, the power flow control method comprises a series converter control method and a parallel converter control method, wherein,
the series converter control method includes:
setting reference active power and reference reactive power of a line at the output side of the series converter, and calculating a d-axis current reference value and a q-axis current reference value of the line at the output side of the series converter according to instantaneous complex power definition;
detecting the actual current of the output side line of the series converter, and decomposing to obtain the d-axis current actual value and the q-axis current actual value of the output side line of the series converter;
according to a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of a line at the output side of the series converter, calculating by using a control equation under a dq coordinate system at the end of the series converter to obtain a first d-axis voltage component and a first q-axis voltage component, and generating a signal for driving the series converter according to the first d-axis voltage component and the first q-axis voltage component so as to drive the series converter to output a compensation voltage with controllable phase angle and amplitude,
the parallel converter control method comprises the following steps:
setting reference active power and reference reactive power of a line at the input side of a parallel converter, and calculating a q-axis current reference value of the line at the input side of the parallel converter according to instantaneous complex power definition;
setting a reference voltage of the direct-current link, detecting an actual voltage of the direct-current link, and acquiring a d-axis current reference value of a line on the input side of the parallel converter according to the reference voltage and the actual voltage of the direct-current link;
detecting the actual current of the input side line of the parallel converter, and decomposing to obtain the d-axis current actual value and the q-axis current actual value of the input side line of the parallel converter;
and calculating a second d-axis voltage component and a second q-axis voltage component by using a control equation under a dq coordinate system of the parallel converter end according to the d-axis current reference value, the d-axis current actual value, the q-axis current reference value and the q-axis current actual value of the input side line of the parallel converter, and generating a signal for driving the parallel converter according to the second d-axis voltage component and the second q-axis voltage component so as to drive the parallel converter to output a compensation current with controllable phase angle and amplitude.
2. The unified power quality controller based power flow control method according to claim 1, wherein the discrete form of the control equation in the dq coordinate system at the series converter end is:
wherein, V sd And V sq Respectively representing a first d-axis voltage component and a first q-axis voltage component, V 1d And V 1q Respectively representing the d-and q-axis components, V, of the grid voltage 2d And V 2q Representing the d-and q-axis components of the load voltage, I, respectively sd *、I sd 、I sq * And I sq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of the output side line of the series converter, R s Representing the equivalent resistance, L, of the line on the output side of the series converter s Representing the equivalent inductance, T, of the line on the output side of the series converter s And the discrete sampling period is represented, omega represents the angular frequency of the power grid system, k represents the current moment, and k +1 represents the next moment.
3. The unified power quality controller based power flow control method according to claim 1, wherein the discrete form of the control equation in the dq coordinate system at the parallel converter end is:
wherein, V pd And V pq Respectively representing a second d-axis voltage component and a second q-axis voltage component, V 1d And V 1q Respectively representing the d-and q-axis components of the grid voltage, I pd *、I pd 、I pq * And I pq Respectively representing a d-axis current reference value, a d-axis current actual value, a q-axis current reference value and a q-axis current actual value of the input side line of the parallel converter, R p Represents the equivalent resistance of the input side line of the parallel converter, L p Representing the equivalent inductance, T, of the input-side line of the parallel converter s And represents a discrete sampling period, omega represents the angular frequency of the power grid system, k represents the current moment, and k +1 represents the next moment.
4. The unified power quality controller-based power flow control method according to claim 1, wherein the obtaining of the d-axis current reference value of the input-side line of the parallel converter according to the reference voltage and the actual voltage of the dc link specifically comprises:
and (3) making a difference between the actual voltage of the direct current link and the reference voltage, inputting the difference into a PI controller, and obtaining a d-axis current reference value of the input side circuit of the parallel converter through PI control.
5. The unified power quality controller-based power flow control method of claim 1, wherein SVPWM control is performed based on the first d-axis voltage component and the first q-axis voltage component to generate PWM signals for driving the series converter.
6. The unified power quality controller-based power flow control method of claim 1, wherein SVPWM control is performed based on the second d-axis voltage component and the second q-axis voltage component to generate PWM signals for driving the parallel converters.
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| CN (1) | CN115912341A (en) |
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2022
- 2022-11-18 CN CN202211448787.9A patent/CN115912341A/en active Pending
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