CN117871929A - Method and device for determining maximum current of SVG during transient overvoltage suppression - Google Patents
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Abstract
A method and apparatus for determining a maximum current of an SVG during transient overvoltage suppression, the method comprising: acquiring a virtual internal potential and a virtual phase angle; obtaining a three-phase voltage component according to the virtual internal potential and the virtual phase angle; according to the three-phase voltage components, configuring SVG control signals, and acquiring reactive power of a new energy unit and reactive power of the new energy unit at the maximum value of transient overvoltage; and obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value. By the method and the device provided by the embodiment of the invention, the response of the SVG to the system change is changed from passive to active, the maximum current of the SVG in the transient overvoltage suppression period is obtained according to calculation, the voltage reactive power supporting capability of the SVG is ensured by selecting proper equipment, and the voltage supporting capability of the SVG is enhanced.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a device for determining the maximum current of SVG in a transient overvoltage suppression period.
Background
The new energy collection area is generally positioned at the tail end of the power grid, and the grid frame of the system is weak. When faults such as short circuits or direct current faults and the like which are easy to cause low voltage occur in the areas, reactive surplus can occur on the station side to cause transient overvoltage problems, and large-scale off-grid of the new energy unit is caused, so that the method is an important factor for restricting large-scale development of new energy. Among them, the reactive power compensation device is a large source of surplus reactive power, and the most commonly used reactive power compensation device in the current power system is an SVG (static var generator, SVG) dynamic reactive power compensation device.
The control mode of the SVG commonly used at the present stage and the synchronization of the power grid require a phase-locked loop (phase locked loop, PLL) to measure the phase information of a public coupling point (point of common coupling, PCC), and the SVG is in a passive response mode to the power grid change and cannot be actively supported. And the voltage support strength of the new energy station has an important influence on the transient overvoltage.
Therefore, how to inhibit the influence of SVG on the transient overvoltage of the new energy station is a problem to be solved at present.
Disclosure of Invention
In view of this, the invention provides a method and a device for determining the maximum current of SVG in the transient overvoltage suppression period, which aims to solve the problem that the current SVG control presents a passive response mode to the change of the power grid and cannot actively support.
In a first aspect, an embodiment of the present invention provides a method for determining a maximum current of an SVG during transient overvoltage suppression, including: acquiring a virtual internal potential and a virtual phase angle; obtaining a three-phase voltage component according to the virtual internal potential and the virtual phase angle; according to the three-phase voltage components, configuring SVG control signals, and acquiring reactive power of a new energy unit and reactive power of the new energy unit at a transient overvoltage maximum value; and obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value.
Further, the virtual internal potential is obtained as follows:
wherein E is SVG virtual internal potential, K p Is a proportion link coefficient, T i Is the integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
Further, the virtual phase angle is obtained by:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is a preset SVG active power value, P e And θ is the virtual phase angle of the SVG.
Further, deriving a three-phase voltage component from the virtual internal potential and the virtual phase angle, comprising: respectively performing dq conversion on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle; obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle; the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation between the reference value and the actual value of the active and reactive current components; and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
Further, obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle, wherein the reference values comprise: the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
Further, by PI control of the deviation of the reference values and the actual values of the active and reactive current components, the dq axis component of the virtual internal potential of the SVG is obtained, including: the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by SVG grid connection point, < >>Respectively the active and reactive current component reference values, i d ，i q The actual current acquired by SVG grid-connected points, kp and Ki are proportional integral control parameters of a current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
Further, the reactive power of the new energy unit is obtained by adopting the following modes:
Q i ＝I q (U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
Further, the reactive power of the new energy unit at the transient overvoltage maximum value is obtained by adopting the following modes:
Q′ i ＝0.3S ac.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
Further, obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value comprises the following steps: the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
In a second aspect, an embodiment of the present invention further provides an apparatus for determining a maximum current of an SVG during transient overvoltage suppression, including: a first acquisition unit configured to acquire a virtual internal potential and a virtual phase angle; the first processing unit is used for obtaining three-phase voltage components according to the virtual internal potential and the virtual phase angle; the second acquisition unit is used for configuring SVG control signals according to the three-phase voltage components and acquiring reactive power of the new energy unit and reactive power of the new energy unit when the transient overvoltage is at the maximum value; and the second processing unit is used for obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value.
Further, the virtual internal potential is obtained as follows:
wherein E is SVG virtual internal potential, K p Is a proportional link coefficient, ti is an integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
Further, the virtual phase angle is obtained by:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is a preset SVG active power value, P e And θ is the virtual phase angle of the SVG.
Further, the first processing unit is further configured to: respectively performing dq conversion on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle; obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle; the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation between the reference value and the actual value of the active and reactive current components; and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
Further, obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle, wherein the reference values comprise: the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
Further, by PI control of the deviation of the reference values and the actual values of the active and reactive current components, the dq axis component of the virtual internal potential of the SVG is obtained, including: the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by SVG grid connection point, < >>Respectively the active and reactive current component reference values, i d ，i q The actual current acquired by SVG grid-connected points, kp and Ki are proportional integral control parameters of a current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
Further, the reactive power of the new energy unit is obtained by adopting the following modes:
Q i ＝I q (U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
Further, the reactive power of the new energy unit at the transient overvoltage maximum value is obtained by adopting the following modes:
Q′ i ＝0.3S ac.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
Further, the second processing unit is further configured to: the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
In a third aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method provided by the above embodiments.
In a fourth aspect, an embodiment of the present invention further provides an electronic device, including: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the methods provided in the foregoing embodiments.
According to the method and the device for determining the maximum current of the SVG in the transient overvoltage suppression period, according to the virtual internal potential and the virtual phase angle, a three-phase voltage component is obtained, according to the three-phase voltage component, SVG control signals are configured, reactive power of a new energy unit and reactive power of the new energy unit in the transient overvoltage maximum value are obtained, and according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value, the maximum current of the SVG in the transient overvoltage suppression period is obtained.
Drawings
FIG. 1 illustrates an exemplary flowchart of a method of determining a maximum current of SVG during transient overvoltage suppression according to an embodiment of the invention;
FIG. 2 illustrates an exemplary block diagram of voltage-source SVG control that suppresses transient overvoltage of a new energy field station, according to an embodiment of the invention;
fig. 3 shows a schematic structural diagram of an apparatus for determining a maximum current of SVG during transient overvoltage suppression according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 illustrates an exemplary flow chart of a method of determining a maximum current of SVG during transient overvoltage suppression according to an embodiment of the invention.
As shown in fig. 1, the method includes:
step S101: a virtual internal potential and a virtual phase angle are acquired.
Further, the virtual internal potential is obtained as follows:
wherein E is SVG virtual internal potential, K p Is a proportion link coefficient, T i Is the integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
Further, the virtual phase angle is obtained as follows:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is a preset SVG active power value, P e And θ is the virtual phase angle of the SVG.
Fig. 2 illustrates an exemplary block diagram of voltage-source SVG control to suppress transient overvoltage of a new energy station in accordance with an embodiment of the present invention. As shown in fig. 2, with virtual excitation control, when the voltage of the power system fluctuates, the voltage deviation is changed to the internal potential by PI control, to obtain the virtual internal potential of SVG, and the virtual phase angle of the electromotive force is obtained by simulating the equation of motion of the rotor. Wherein, the preset SVG active power value P of the general SVG ref ＝0。
Step S102: and obtaining three-phase voltage components according to the virtual internal potential and the virtual phase angle.
Further, deriving a three-phase voltage component from the virtual internal potential and the virtual phase angle, comprising:
respectively performing dq transformation on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle;
obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle;
the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation of the reference value and the actual value of the active and reactive current components;
and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
Further, deriving active and reactive current component reference values from dq-axis components of the virtual internal potential and the virtual phase angle, comprising:
the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
As shown in fig. 2, in the above embodiment, the output current reference value is calculated by the virtual circuit.
Further, by PI control of deviations of the reference values and the actual values of the active and reactive current components, the dq axis component of the SVG virtual internal potential is obtained, including:
the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by SVG grid connection point, < >>Respectively the active and reactive current component reference values, i d ，i q The actual current acquired by SVG grid-connected points, kp and Ki are proportional integral control parameters of a current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
As shown in fig. 2, in the above embodiment, the dq axis component of the SVG virtual internal potential is obtained by the current inner loop control.
Step S103: and configuring SVG control signals according to the three-phase voltage components, and acquiring reactive power of the new energy unit and reactive power of the new energy unit in the transient overvoltage maximum value.
In the above embodiment, the corresponding SVG control signal is obtained by PWM modulation based on the three-phase voltage components.
Further, the reactive power of the new energy unit is obtained by adopting the following modes:
Q i ＝I q (U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
Further, the reactive power of the new energy unit at the transient overvoltage maximum value is obtained by adopting the following modes:
Q′ i ＝0.3S ac.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
Step S104: and obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value.
Further, obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value comprises the following steps:
the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
Specifically, for steps S103 and S104, after the low voltage ride through, the new energy unit may have a transient overvoltage condition due to reactive surplus, and at this time, the new energy unit has reactive power:
Q i ＝I q (U N +ΔU i )
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q For reactive current of new energy units, I is preferable because reactive priority is given to low voltage ride through period q ＝I N ，ΔU i Is the voltage increment during transient overvoltage.
After SVG is configured, the standard requirement of the withstand voltage of wind-powered photovoltaic is 1.3pu, and an approximation algorithm is adopted to calculate the highest transient overvoltage (delta U) i_max =0.3 p.u) new energy unit reactive power:
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i Short-circuit capacity of the new energy station grid-connected point,x i the equivalent reactance between the new energy station collection points for the alternating current system.
Therefore, the maximum reactive power support which is required to be provided by the SVG in the transient overvoltage process can be obtained, and the maximum current of the SVG is calculated:
wherein Q is SVG_max For the maximum reactive support that SVG should provide during transient overvoltage, I SVG_max Maximum current for SVG.
According to the embodiment, according to the virtual internal potential and the virtual phase angle, the three-phase voltage component is obtained, the SVG control signal is configured according to the three-phase voltage component, the reactive power of the new energy unit and the reactive power of the new energy unit when the transient overvoltage is maximum are obtained, the maximum current of the SVG in the transient overvoltage suppression period is obtained according to the reactive power of the new energy unit and the reactive power of the new energy unit when the transient overvoltage is maximum, and the control mode provided by the embodiment of the invention is different from the traditional SVG control in which the power injection is regulated by controlling the active current and the reactive current.
Fig. 3 shows a schematic structural diagram of an apparatus for determining a maximum current of SVG during transient overvoltage suppression according to an embodiment of the present invention.
As shown in fig. 3, the apparatus includes:
a first acquisition unit 301 for acquiring a virtual internal potential and a virtual phase angle;
a first processing unit 302, configured to obtain a three-phase voltage component according to the virtual internal potential and the virtual phase angle;
a second obtaining unit 303, configured to configure an SVG control signal according to the three-phase voltage component, and obtain reactive power of the new energy unit and reactive power of the new energy unit when the transient overvoltage is at a maximum value;
the second processing unit 304 is configured to obtain a maximum current of the SVG during the transient overvoltage suppression according to the reactive power of the new energy unit and the reactive power of the new energy unit during the transient overvoltage maximum value.
Further, the virtual internal potential is obtained as follows:
wherein E is SVG virtual internal potential, K p Is a proportion link coefficient, T i Is the integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
Further, the virtual phase angle is obtained as follows:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is a preset SVG active power value, P e And θ is the virtual phase angle of the SVG.
Further, the first processing unit 302 is further configured to:
respectively performing dq transformation on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle;
obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle;
the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation of the reference value and the actual value of the active and reactive current components;
and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
Further, deriving active and reactive current component reference values from dq-axis components of the virtual internal potential and the virtual phase angle, comprising:
the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
Further, by PI control of deviations of the reference values and the actual values of the active and reactive current components, the dq axis component of the SVG virtual internal potential is obtained, including:
the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by SVG grid connection point, < >>Respectively the active and reactive current component reference values, i d ，i q The actual current acquired by SVG grid-connected points, kp and Ki are proportional integral control parameters of a current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
Further, the reactive power of the new energy unit is obtained by adopting the following modes:
Q i ＝I q (U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
Further, the reactive power of the new energy unit at the transient overvoltage maximum value is obtained by adopting the following modes:
Q′ i ＝0.3S aAC.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
Further, the second processing unit 304 is further configured to:
the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
According to the embodiment, according to the virtual internal potential and the virtual phase angle, the three-phase voltage component is obtained, the SVG control signal is configured according to the three-phase voltage component, the reactive power of the new energy unit and the reactive power of the new energy unit when the transient overvoltage is maximum are obtained, the maximum current of the SVG in the transient overvoltage suppression period is obtained according to the reactive power of the new energy unit and the reactive power of the new energy unit when the transient overvoltage is maximum, and the control mode provided by the embodiment of the invention is different from the traditional SVG control in which the power injection is regulated by controlling the active current and the reactive current.
It should be noted that, when the apparatus provided in the foregoing embodiment performs the functions thereof, only the division of the foregoing functional modules is used as an example, in practical application, the foregoing functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above. In addition, the apparatus and the method embodiments provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the apparatus and the method embodiments are detailed in the method embodiments and are not repeated herein.
Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of determining a maximum current of an SVG during transient overvoltage suppression provided by the above embodiments.
The embodiment of the invention also provides electronic equipment, which comprises: a processor; a memory for storing processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method for determining a maximum current of the SVG during transient overvoltage suppression provided by the above embodiments.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (20)
1. A method of determining a maximum current of an SVG during transient overvoltage suppression, comprising:
acquiring a virtual internal potential and a virtual phase angle;
obtaining a three-phase voltage component according to the virtual internal potential and the virtual phase angle;
according to the three-phase voltage components, configuring SVG control signals, and acquiring reactive power of a new energy unit and reactive power of the new energy unit at a transient overvoltage maximum value;
and obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value.
2. The method according to claim 1, characterized in that the virtual internal potential is obtained in the following way:
wherein E is SVG virtual internal potential, K p Is a proportion link coefficient, T i Is the integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
3. The method of claim 1, wherein the virtual phase angle is obtained by:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is a preset SVG active power value, P e And θ is the virtual phase angle of the SVG.
4. The method of claim 1, wherein deriving a three-phase voltage component from the virtual internal potential and the virtual phase angle comprises:
respectively performing dq conversion on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle;
obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle;
the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation between the reference value and the actual value of the active and reactive current components;
and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
5. The method of claim 4, wherein deriving the active and reactive current component reference values from the dq-axis components of the virtual internal potential and virtual phase angle comprises:
the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
6. The method of claim 4, wherein deriving the dq-axis component of the virtual internal potential of the SVG by PI control of the deviation of the active and reactive current component reference values from actual values comprises:
the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by the SVG grid-connected point,respectively the active and reactive current component reference values, i d ，i q Kp is the actual current acquired by SVG grid connection pointKi is proportional integral control parameter of the current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
7. The method according to claim 1, characterized in that the reactive power of the new energy unit is obtained in the following way:
Q i ＝I q U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
8. The method according to claim 1, wherein the reactive power of the new energy unit at the transient overvoltage maximum is obtained by:
Q′ i ＝0.3S ac.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
9. The method of claim 1, wherein deriving the maximum current of the SVG during transient overvoltage suppression based on the reactive power of the new energy unit and the reactive power of the new energy unit at the transient overvoltage maximum value comprises:
the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
10. An apparatus for determining a maximum current of an SVG during transient overvoltage suppression, comprising:
a first acquisition unit configured to acquire a virtual internal potential and a virtual phase angle;
the first processing unit is used for obtaining three-phase voltage components according to the virtual internal potential and the virtual phase angle;
the second acquisition unit is used for configuring SVG control signals according to the three-phase voltage components and acquiring reactive power of the new energy unit and reactive power of the new energy unit when the transient overvoltage is at the maximum value;
and the second processing unit is used for obtaining the maximum current of the SVG in the transient overvoltage suppression period according to the reactive power of the new energy unit and the reactive power of the new energy unit in the transient overvoltage maximum value.
11. The apparatus of claim 10, wherein the virtual internal potential is obtained by:
wherein E is SVG virtual internal potential, K p Is a proportion link coefficient, T i Is the integral link time constant, v ac V is the actual voltage of SVG grid connection point ac * And rated voltage is set for SVG grid connection points.
12. The apparatus of claim 10, wherein the virtual phase angle is obtained by:
wherein T is j Is a virtual moment of inertia time constant omega 0 For the system angular velocity, ω is the SVG virtual angular velocity, P ref Is the preset SVG active powerPower value, P e And θ is the virtual phase angle of the SVG.
13. The apparatus of claim 10, wherein the first processing unit is further configured to:
respectively performing dq conversion on the virtual internal potential and the virtual phase angle to obtain dq axis components of the virtual internal potential and the virtual phase angle;
obtaining active and reactive current component reference values according to dq axis components of the virtual internal potential and the virtual phase angle;
the dq axis component of the virtual internal potential of the SVG is obtained through PI control on the deviation between the reference value and the actual value of the active and reactive current components;
and performing park inverse transformation on the dq axis component of the SVG virtual internal potential according to the virtual phase angle to obtain a three-phase voltage component.
14. The apparatus of claim 13, wherein deriving the active and reactive current component reference values from the dq-axis components of the virtual internal potential and virtual phase angle comprises:
the active and reactive current component reference values are obtained by adopting the following steps:
wherein,respectively, active and reactive current component reference values, < ->The dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage acquired by SVG grid connection point, R, X is the actual impedance parameter, R v 、X v Is a virtual impedance parameter.
15. The apparatus of claim 13, wherein deriving the dq-axis component of the SVG virtual internal potential by PI control of the deviation of the active and reactive current component reference values from actual values comprises:
the dq axis component of the SVG virtual internal potential was obtained using the following:
wherein,the dq-axis component, v, of the virtual internal potential of SVG d ，v q Is the actual voltage collected by the SVG grid-connected point,respectively the active and reactive current component reference values, i d ，i q The actual current acquired by SVG grid-connected points, kp and Ki are proportional integral control parameters of a current inner loop, ωLi q 、ωLi d Is the current feedforward decoupling amount.
16. The apparatus of claim 10, wherein the reactive power of the new energy unit is obtained by:
Q i ＝I q (U N +ΔU i )；
wherein Q is i Reactive power of new energy unit, U N At nominal voltage, I q Is reactive current of new energy unit, delta U i Is the voltage increment during transient overvoltage.
17. The device according to claim 10, wherein the reactive power of the new energy unit at the transient overvoltage maximum is obtained by:
Q′ i ＝0.3S ac.i ；
wherein Q' i Is reactive power of the new energy unit at the maximum value of transient overvoltage, S ac.i And the capacity of short circuit of the new energy station grid-connected point is obtained.
18. The apparatus of claim 10, wherein the second processing unit is further configured to:
the maximum current of SVG during transient overvoltage suppression is obtained using:
wherein Q is i Is reactive power of new energy unit, Q' i The reactive power of the new energy unit at the maximum value of the transient overvoltage is U N Is the nominal voltage.
19. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of any of claims 1-9.
20. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor being configured to read the executable instructions from the memory and execute the executable instructions to implement the method of any one of claims 1-9.
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