CN111537794A - Topological system, control method and storage medium of three-port impedance frequency sweeping device - Google Patents

Topological system, control method and storage medium of three-port impedance frequency sweeping device Download PDF

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CN111537794A
CN111537794A CN202010433570.5A CN202010433570A CN111537794A CN 111537794 A CN111537794 A CN 111537794A CN 202010433570 A CN202010433570 A CN 202010433570A CN 111537794 A CN111537794 A CN 111537794A
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voltage
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CN111537794B (en
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姜云龙
袁宇波
杨景刚
史明明
司鑫尧
张宸宇
刘瑞煌
袁晓冬
葛雪峰
苏伟
肖小龙
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • 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
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The invention discloses a topological system, a control method and a storage medium of a three-port impedance frequency sweeping device, wherein the system comprises two direct current ports, a parallel branch and two series branches, the two series branches are connected between the two direct current ports in series, and the parallel branch is connected between the two series branches in parallel; the two serial branches are respectively provided with a three-phase alternating current input port and a harmonic disturbance voltage output port, the three-phase alternating current input ports of the two serial branches are connected in parallel to form an alternating current port of the frequency sweeping device, and the harmonic disturbance voltage output ports of the two serial branches are connected in series at a node; the parallel branch circuit is provided with a harmonic disturbance current output port which is connected to a node. The invention can simultaneously carry out impedance frequency sweep experiments of two tested devices, has two functions of series voltage disturbance injection and parallel current disturbance injection, and is suitable for testing various impedance characteristics of devices.

Description

Topological system, control method and storage medium of three-port impedance frequency sweeping device
Technical Field
The invention relates to the field of direct current test equipment, in particular to a topological system, a control method and a storage medium of a three-port impedance frequency sweeping device.
Background
A large number of power electronic devices exist in the flexible direct current system, and the resonance mechanism of the direct current system can be accurately analyzed by researching the impedance frequency characteristics of each device. The existing engineering frequency sweeping means mainly comprises two types: one type is a controller based on a power electronic device, a detailed model is built by combining a semi-physical simulation platform, impedance frequency characteristics are obtained through simulation, but the accuracy of the scheme depends on the obtaining of device parameters, and the implementation of the scheme depends on the provision of controller interface parameters by a device manufacturer. The other type is based on an independent impedance frequency sweeping device, harmonic disturbance signals are injected into the system, and the impedance frequency characteristics of the device are directly measured.
The existing impedance measuring device is divided into a parallel current harmonic disturbance injection type and a series voltage harmonic disturbance injection type. The voltage disturbance type generally needs to realize the injection of disturbance signals in a mode that a transformer is connected in series into a system, so that direct current flows into a disturbance injection device during steady-state work, the transformer is easily subjected to magnetic saturation, and a measuring device is inconvenient to disassemble. The current disturbance type has a problem of disturbance distribution unevenness. The distribution of the current disturbance is uniquely determined by the impedance across the system disturbance. When the input impedance of the DC/DC converter which operates independently is measured, the source converter is a nearly ideal direct current power supply which is used for providing a direct current working point, and if a current parallel injection method is adopted, almost all current flows into the direct current source, so that the measurement is failed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects that an impedance measuring device in the prior art is single in function, a parallel current harmonic disturbance injection type is not suitable for measuring a load type device, and a series voltage harmonic disturbance injection type is not suitable for measuring a power supply type device, a topological system and a control method of a three-port impedance frequency sweeping device are provided, and the three-port impedance frequency sweeping device is suitable for testing various impedance characteristic devices, improves the testing experiment efficiency, and reduces the size of the device.
The technical scheme is as follows: in order to achieve the above object, the present invention provides a topology system of a three-port impedance frequency-sweeping device, comprising two dc ports, a parallel branch and two series branches, wherein the two series branches are connected in series between the two dc ports, and the parallel branch is connected in parallel between the two series branches;
the two serial branches are respectively provided with a three-phase alternating current input port and a harmonic disturbance voltage output port, the three-phase alternating current input ports of the two serial branches are connected in parallel to form an alternating current port of the frequency sweeping device, and the harmonic disturbance voltage output ports of the two serial branches are connected in series to a node O;
the parallel branch circuit is provided with a harmonic disturbance current output port, and the harmonic disturbance current output port is connected to a node O.
Furthermore, the parallel branch is formed by connecting a plurality of parallel branch submodules and an inductor in series, the type of the submodules is not fixed, and the parallel branch can be formed by mixing a part of full-bridge submodules and a part of half-bridge submodules but is not fixed in a sub-module type.
Furthermore, the series branch is formed by connecting a plurality of series branch submodules with an inductor in series, and the three-phase alternating current input side of each submodule is connected in parallel after passing through the multi-winding phase-shifting transformer to be used as an alternating current port of the series branch. The sub-module structure is that the H-bridge module is connected with a capacitor in series and then connected with a three-phase rectifier bridge module in series. The three-phase rectifier bridge module adopts a three-phase controllable rectifier module or a three-phase uncontrollable rectifier module.
The invention provides a control method of a three-port impedance frequency sweeping device, which comprises the following steps:
s1: parallel current disturbance injection control: taking the sum of sub-module energy of the parallel branch as the feedback quantity of an energy outer ring, making a difference with given energy, taking the difference as a given value of a current inner ring after passing through an energy outer ring PI controller, making a difference between the given value of the current inner ring and the current of the parallel branch, and obtaining a voltage modulation signal for controlling the disturbance injection of the parallel current after passing through a current ring PI controller;
series voltage disturbance injection control: taking the sum of the output voltages of the two series branches as a voltage loop feedback quantity, making a difference with a given voltage, and obtaining a voltage modulation signal for series voltage disturbance injection control after passing through a voltage loop PI controller;
s2: calculating the modulation voltage of the three ports by adopting a modulation function according to the voltage modulation signal
For the parallel branch, the modulation voltage is the sum of half values of the voltages of the two direct current ports, and then the modulation voltage for part of parallel current disturbance injection control is subtracted;
setting the two serial branches as a first serial branch and a second serial branch respectively, and setting the corresponding two direct current ports as a first direct current port and a second direct current port respectively;
for the first series branch, the modulation voltage is obtained by subtracting the half value of the second direct current port voltage from the half value of the first direct current port voltage, adding half of the modulation voltage controlled by the series voltage disturbance injection, and subtracting the modulation voltage controlled by part of the parallel current disturbance injection;
for the second series branch, the modulation voltage is obtained by subtracting the half value of the first direct current port voltage from the half value of the second direct current port voltage, subtracting the half value of the modulation voltage of the series voltage disturbance injection control, and subtracting the modulation voltage of part of the parallel current disturbance injection control.
In another aspect, the present invention provides a control system for a three-port impedance frequency-sweeping device, the system comprising a memory and a processor; wherein the content of the first and second substances,
the memory to store computer program instructions operable on the processor;
the processor, when executing the computer program instructions, is configured to perform the steps of a method for controlling a three-port impedance frequency sweeping device.
In another aspect, the present invention provides a computer storage medium storing a program of a method of controlling a three-port impedance sweeping device, the program implementing the steps of the method of controlling a three-port impedance sweeping device when executed by at least one processor.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the frequency sweep test method can be used for simultaneously carrying out impedance frequency sweep experiments on two tested devices, has two functions of series voltage disturbance injection and parallel current disturbance injection, and is suitable for testing various devices with impedance characteristics.
2. The voltage of the submodule can be maintained to be stable in operation, the submodule in a cold standby state is not available, and the testing experiment efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a main circuit topology of a three-port impedance frequency-sweeping device;
FIG. 2 is a schematic diagram of a parallel branch topology;
fig. 3 and 4 are schematic diagrams of two types of parallel branch sub-module topologies respectively;
FIG. 5 is a schematic diagram of a series branch topology;
FIGS. 6 and 7 are schematic diagrams of two types of serial branch submodule topologies, respectively;
FIG. 8 is a block diagram of parallel current disturbance injection control;
FIG. 9 is a block diagram of series voltage disturbance injection control;
FIG. 10 is a diagram of modulation functions for parallel branches;
FIG. 11 is a diagram illustrating modulation functions of a first serial branch;
FIG. 12 is a diagram of the modulation function of the second series arm;
FIG. 13 is a plot of disturbance current waveforms under parallel current disturbance injection;
FIG. 14 is a graph of disturbance voltage waveforms under series voltage disturbance injection.
Detailed Description
The invention is further elucidated with reference to the drawings and the embodiments.
As shown in fig. 1, the present invention provides a topology system of a three-port impedance frequency sweep apparatus, including a first dc port, a second dc port, a parallel branch, a first series branch and a second series branch, where the first series branch and the second series branch are connected in series between the first dc port and the second dc port, the parallel branch is connected in parallel between the first series branch and the second series branch, both the first series branch and the second series branch have a three-phase ac input port and a harmonic disturbance voltage output port, the three-phase ac input ports of the two series branches are connected in parallel to form an ac port U, V, W of the frequency sweep apparatus, the harmonic disturbance voltage output ports of the two series branches are connected in series to a node O, and the series voltage disturbance output port of the entire frequency sweep apparatus is A, B; the parallel branch is provided with a harmonic disturbance current output port, one end of the parallel branch is connected to the node O, and the parallel current disturbance output port of the whole frequency sweeping device is N.
As shown in fig. 2, the parallel branch is formed by connecting a plurality of parallel branch submodules in series with an inductor, and the submodule types are not fixed and can beThe device is formed by mixing a part of full-bridge sub-modules and a part of half-bridge sub-modules. As shown in FIG. 3, the switch is a half-bridge structure and comprises two switching tubes Q1、Q2And an energy storage capacitor. Or a full-bridge structure, as shown in FIG. 4, comprising four switching tubes Q1、Q2、Q3、Q4And an energy storage capacitor. But not fixed to a sub-module type; in this embodiment, the parallel branch route includes N half-bridge sub-modules or full-bridge sub-modules SMa1～SMaNIn series with an inductor.
As shown in fig. 5, the series branch is formed by connecting a plurality of series branch submodules in series with an inductor, and the three-phase ac input side of each series branch submodule is connected in parallel as the ac port of the series branch after passing through the multi-winding phase-shifting transformer. The series branch submodule has the structure that an H-bridge module is connected with a capacitor in series and then is connected with a three-phase rectifier bridge module in series. The three-phase rectifier bridge module can adopt three-phase controllable rectification or three-phase uncontrollable rectification. In this embodiment, the parallel branch is formed by connecting M sub-modules using three-phase controllable rectification or three-phase uncontrolled rectification SMb 1-SMbM and an inductor in series. As shown in FIG. 6, the H-bridge module is connected with the capacitor in series and then connected with the three-phase controllable rectifier bridge module in series, and the H-bridge module is composed of four switching tubes Q1、Q2、Q3、Q4The three-phase controllable rectifier bridge module consists of six switching tubes Q5、Q6、Q7、Q8、Q9、Q10Is connected with three inductors in series. The three-phase bridge rectifier module can also be a three-phase uncontrolled rectifier module, as shown in FIG. 7, and comprises six diodes D1、D2、D3、D4、D5、D6Three inductors are connected in series.
In this embodiment, the three-port impedance frequency sweep device topology system is used to control the three-port modulation voltage, and the specific process is as follows:
for parallel current disturbance injection control:
taking the energy sum of the sub-modules of the parallel branch as the feedback quantity of an energy outer ring, making a difference with given energy, and taking the difference as the given value of a current inner ring after passing through an energy outer ring PI controller; and (3) making a difference between the obtained given value of the current inner loop and the current of the parallel branch circuit, and obtaining a voltage modulation signal for controlling the disturbance injection of the parallel current after passing through a current loop PI controller. As shown in fig. 8, a cascade control structure of a voltage outer loop and a current inner loop is adopted. The control equation for the current inner loop is:
Figure BDA0002501388390000041
and the current inner loop adopts PI control. In the formula up *Injection of controlled modulation voltage, K, for parallel current disturbanceP_i_p、KI_i_pFor PI control parameters, ip_refFor given value of inner loop current, ipIs the current of the parallel branch. The governing equation of the energy outer loop is:
Figure BDA0002501388390000042
and the voltage outer ring adopts PI control. In the formula umidIs a voltage u1And u2Average value of (1), KP_u_p、KI_u_pFor PI control parameters, ep_refGiven value of energy sum of sub-modules of parallel branch, epThe sub-module energy sum of the parallel branch is obtained.
ep_refThe calculation formula of (2) is as follows:
ep_ref＝Ep_ref+eharmonic_ref
in the formula, eharmonic_refFor the given value of disturbance energy, an open-loop feedforward control method is adopted, and the calculation formula is
eharmonic_ref＝f(ω)umidiharmonic_ref
Figure BDA0002501388390000043
In the formula iharmonic_refGiven value of disturbance current, Lp、RpThe sum of equivalent inductance and equivalent resistance of the parallel branch and a half of the series branch respectively, and omega is the angular frequency of disturbance current.
For series voltage disturbance injection control:
and taking the sum of the output voltages of the first series branch and the second series branch as a voltage loop feedback quantity, and obtaining a voltage modulation signal for series voltage disturbance injection control after the difference between the voltage loop feedback quantity and the given voltage is processed by a voltage loop PI controller. As shown in fig. 9, the control equation for the voltage loop is:
Figure BDA0002501388390000051
in the formula, KP_u_s、KI_u_s、KR_u_sTo control the parameter, uharmonic_refFor a given value of the disturbance voltage, omega is the angular frequency of the disturbance current, u1Is the port voltage of the first DC port, u2Is the port voltage of the second dc port.
The modulation voltage of the three ports is calculated by using a modulation function:
as shown in fig. 10-12, which are modulation functions of the parallel branch, the first series branch, and the second series branch, respectively, in the figures,
Figure BDA0002501388390000052
the resulting modulated voltage is injected for parallel current disturbance,
Figure BDA0002501388390000053
the resulting modulated voltage is injected for series voltage disturbance control. And calculating a modulation function by using the actual value of the capacitance voltage of the submodule.
For the first series branch, its modulation voltage us1Is composed of
Figure BDA0002501388390000054
For the second series branch, its modulation voltage us2Is composed of
Figure BDA0002501388390000055
For the parallel branch, its modulation voltage upIs composed of
Figure BDA0002501388390000056
And the coefficient k is a distribution coefficient of the modulation voltage obtained by parallel current disturbance injection control between the first and second series branches and the parallel branch. An optimal coefficient k is selected according to a target value u of the sum of the capacitor voltages of the parallel branchesC_sum_p_refRated value u of sum of capacitor voltages of series branchC_sum_s_refIs set, i.e.
Figure BDA0002501388390000057
In this embodiment, the disturbance current waveform under parallel current disturbance injection and the disturbance voltage waveform under series voltage disturbance injection are finally obtained, as shown in fig. 13 and 14, respectively. As can be seen from FIG. 13, the actual output 500Hz disturbance current has an amplitude of 50A; as can be seen from FIG. 14, the actual output 500Hz disturbance voltage has an amplitude of 1865V.
The embodiment also provides a control system of the three-port impedance frequency sweeping device, which comprises a network interface, a memory and a processor; the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements; a memory for storing computer program instructions executable on the processor; a processor for, when executing the computer program instructions, performing the steps of the consensus method described above.
The present embodiment also provides a computer storage medium storing a computer program that when executed by a processor can implement the method described above. The computer-readable medium may be considered tangible and non-transitory. Non-limiting examples of a non-transitory tangible computer-readable medium include a non-volatile memory circuit (e.g., a flash memory circuit, an erasable programmable read-only memory circuit, or a mask read-only memory circuit), a volatile memory circuit (e.g., a static random access memory circuit or a dynamic random access memory circuit), a magnetic storage medium (e.g., an analog or digital tape or hard drive), and an optical storage medium (e.g., a CD, DVD, or blu-ray disc), among others. The computer program includes processor-executable instructions stored on at least one non-transitory tangible computer-readable medium. The computer program may also comprise or rely on stored data. The computer programs may include a basic input/output system (BIOS) that interacts with the hardware of the special purpose computer, a device driver that interacts with specific devices of the special purpose computer, one or more operating systems, user applications, background services, background applications, and the like.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (9)

1. A topological system of a three-port impedance frequency sweeping device is characterized in that: the device comprises two direct current ports, a parallel branch and two series branches, wherein the two series branches are connected between the two direct current ports in series, and the parallel branch is connected between the two series branches in parallel;
the two serial branches are respectively provided with a three-phase alternating current input port and a harmonic disturbance voltage output port, the three-phase alternating current input ports of the two serial branches are connected in parallel to form an alternating current port of the frequency sweeping device, and the harmonic disturbance voltage output ports of the two serial branches are connected in series to a node O;
the parallel branch circuit is provided with a harmonic disturbance current output port, and the harmonic disturbance current output port is connected to a node O.
2. A three-port impedance swept apparatus topology system as claimed in claim 1, wherein: the parallel branch is formed by connecting a plurality of parallel branch submodules with an inductor in series.
3. A three-port impedance swept apparatus topology system as claimed in claim 1, wherein: the series branch is formed by connecting a plurality of series branch submodules in series with an inductor.
4. A topology system of a three-port impedance frequency-sweeping device as claimed in claim 3, wherein: the series branch submodule comprises an H-bridge module, a capacitor and a three-phase rectifier bridge module which are sequentially connected in series.
5. A control method of a three-port impedance frequency sweep device is characterized in that: the method comprises the following steps:
s1: taking the sum of sub-module energy of the parallel branch as the feedback quantity of an energy outer ring, making a difference with given energy, taking the difference as a given value of a current inner ring after passing through an energy outer ring PI controller, making a difference between the given value of the current inner ring and the current of the parallel branch, and obtaining a voltage modulation signal for controlling the disturbance injection of the parallel current after passing through a current ring PI controller;
taking the sum of the output voltages of the two series branches as a voltage loop feedback quantity, making a difference with a given voltage, and obtaining a voltage modulation signal for series voltage disturbance injection control after passing through a voltage loop PI controller;
s2: and respectively calculating the modulation voltages of the parallel branch and the two serial branches by adopting a modulation function according to the voltage modulation signal.
6. A method for controlling a three-port impedance sweeping device according to claim 5, wherein: the modulation voltages of the parallel branch and the two series branches are calculated as follows:
setting the two serial branches as a first serial branch and a second serial branch respectively, and setting the corresponding two direct current ports as a first direct current port and a second direct current port respectively;
for the first series branch, itModulating voltage us1Is composed of
Figure FDA0002501388380000011
For the second series branch, its modulation voltage us2Is composed of
Figure FDA0002501388380000012
For the parallel branch, its modulation voltage upIs composed of
Figure FDA0002501388380000021
Wherein u is1Is the port voltage of the first DC port, u2Is the port voltage of the second dc port,
Figure FDA0002501388380000022
the resulting modulated voltage is injected for parallel current disturbance,
Figure FDA0002501388380000023
and k is the distribution coefficient of the modulation voltage obtained by the parallel current disturbance injection control among the first series branch, the second series branch and the parallel branch.
7. A method for controlling a three-port impedance sweeping device according to claim 6, wherein: the selection method of the distribution coefficient k comprises the following steps: rated value u based on sum of capacitance and voltage of parallel branchC_sum_p_refRated value u of sum of capacitor voltages of series branchC_sum_s_refIs set, i.e.
Figure FDA0002501388380000024
8. A control system of a three-port impedance frequency sweep device is characterized in that: the system includes a memory and a processor; wherein the content of the first and second substances,
the memory to store computer program instructions operable on the processor;
the processor, when executing the computer program instructions, is configured to perform the steps of a method for controlling a three-port impedance frequency sweeping apparatus according to any one of claims 5 to 7.
9. A computer storage medium, characterized in that: the computer storage medium stores a program of a method of controlling a three-port impedance sweeping device, the program implementing the steps of a method of controlling a three-port impedance sweeping device as claimed in any one of claims 5 to 7 when executed by at least one processor.
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Title
ZHIYU SHEN等: "Three-phase AC System Impedance Measurement Unit (IMU) using Chirp Signal Injection", 《2013 TWENTY-EIGHTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION(APEC)》 *
谢志为等: "双模式扰动下新能源发电装备的宽频带序阻抗在线精确测量方法", 《中国电机工程学报》 *

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