CN107451756A - Flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy - Google Patents

Flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy Download PDF

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CN107451756A
CN107451756A CN201710711566.9A CN201710711566A CN107451756A CN 107451756 A CN107451756 A CN 107451756A CN 201710711566 A CN201710711566 A CN 201710711566A CN 107451756 A CN107451756 A CN 107451756A
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submodule
voltage
until
excision
input
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阳岳希
杨杰
许韦华
涂莉
江伟
杜镇宇
季明晶
黄道姗
张慧瑜
杨双飞
辛业春
王威儒
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Global Energy Interconnection Research Institute
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
Northeast Electric Power University
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Northeast Dianli University
Global Energy Interconnection Research Institute
Electric Power Research Institute of State Grid Fujian Electric Power Co Ltd
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Abstract

The present invention relates to a kind of flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy, belong to technical field of electric power.For the modulation of high-voltage large-capacity modularization multi-level converter and submodule input, excision problem, it is proposed that reduce the packet sequencing modulator approach of submodule capacitor voltage sort operation amount.It is optimal for target with capacitance voltage sort operation amount, determine the optimal group quantity of converter bridge arm submodule；The submodule capacitor voltage matrix established after packet, and it is carried out longitudinally sort in group, organize between laterally sort, form the submodule block matrix using submodule capacitor voltage as sequence；Each controlling cycle, according to bridge arm current parameter, direction is raised and lowered according to submodule voltage, carries out submodule input, excision control.The control of submodule capacitor voltage deviation is introduced simultaneously, to prevent that capacitance voltage deviation is excessive and reduce power device switching frequency.

Description

Flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of flexible direct current power transmission system overhead transmission line submodule packet Sort modulation strategy.Suitable for the Modularized multi-level converter sub-module modulation strategy of flexible direct current power transmission system, son is reduced Module switch number, simplify system operations complexity.
Background technology
2001, modularization multi-level converter was proposed by German scholar R.Marquardt and A.Lesnicar, was promoted The development of high voltage dc transmission technology.So far, China's Technology of HVDC based Voltage Source Converter is quickly grown, the exemplary work to have put into operation Journey includes：Shanghai Nanhui demonstration project, Nan'ao engineering, Zhoushan engineering and Xiamen engineering etc..Above-mentioned engineering uses direct current cables Transmission of electricity, but compared with overhead line, cable cost is high, and failure is mostly permanent, is not easy to overhaul and safeguards.So will be soft Property HVDC Transmission Technology to overhead line field of power transmission extension be power network future development a trend.In addition, with new energy electricity Power demand constantly increases, and the MMC-HVDC systems of true dipolar configuration have played larger in the transmission of electricity occasion of high voltage, Large Copacity Advantage.At present, the soft straight engineerings of Zhangbei County 500kV that will be built just are transmitted electricity using overhead line, and its current conversion station topology is true bipolar junction Structure.
Because each submodule electric capacity is independent in MMC, to realize capacitance voltage equilibrium, how each controlling cycle is to submodule It is that MMC controls have to solve the problems, such as to carry out the input of selectivity and excision.Basic submodule control method is to submodule Block capacitance voltage is ranked up, and bridge arm current puts into capacitance voltage minimum some submodules when being more than zero, and bridge arm current is less than Some submodules of voltage highest are put into when zero.For submodule capacitor voltage sequence, how to reduce power device switching frequency It is the emphasis for needing to solve.
The content of the invention
It is an object of the invention to provide a kind of flexible direct current power transmission system overhead transmission line submodule packet sequencing to modulate plan Slightly, solves above mentioned problem existing for prior art.The present invention for high-voltage large-capacity modularization multi-level converter modulation and Submodule input, excision problem, it is proposed that reduce the packet sequencing modulator approach of submodule capacitor voltage sort operation amount.With electricity Hold the optimal optimal group quantity for being target, determining converter bridge arm submodule of voltage sort operation amount；The son established after packet Module capacitance voltage matrix, and it is carried out longitudinally sort in group, organize between laterally sort, formed using submodule capacitor voltage as sequence Submodule block matrix；Each controlling cycle, according to bridge arm current parameter, direction is raised and lowered according to submodule voltage, carries out Submodule input, excision control.The control of submodule capacitor voltage deviation is introduced simultaneously, to prevent that capacitance voltage deviation is excessive and drops Low power devices switching frequency.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
Flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy, comprises the following steps：
Step 1) is optimal for target with capacitance voltage sort operation amount, determines the optimal group number of converter bridge arm submodule Amount；
The submodule capacitor voltage matrix that step 2) is established after packet, and it is carried out longitudinally sort in group, organize between laterally Sequence, forms the submodule block matrix using submodule capacitor voltage as sequence；
The each controlling cycle of step 3), according to bridge arm current parameter, direction is raised and lowered according to submodule voltage, carries out Submodule input, excision control；
Step 4) submodule capacitor voltage deviation controls, to prevent that capacitance voltage deviation is excessive and reduce power device switch Frequency.
The optimal group quantity of determination converter bridge arm submodule described in step 1) is：Each bridge arm submodule is averaged It is divided into M groups, every group is n including submodule quantity
Submodule block matrix of the formation using submodule capacitor voltage as sequence described in step 2) be：It is right in each packet first N submodule capacitor voltage carries out longitudinal sequence, and it is SM to numberi(i ∈ [1, n]), then to each group sequence number identical submodule Block laterally sorted between capacitance voltage group, i.e., is all sequence number SM by each groupiThe capacitance voltage of submodule is ranked up, and is numbered For SMij(j ∈ [1, M])；After being sorted between each group same sequence number submodule capacitor voltage group, you can big according to submodule capacitor voltage Small formation submodule block matrix；In matrix, each row from top to bottom, organize internal sort, and submodule capacitor voltage reduces successively；Per a line From left to right, sorted between group, submodule capacitor voltage reduces successively.
Direction is raised and lowered according to submodule voltage described in step 3), carries out submodule input, excision control is：Can To determine, the submodule capacitor voltage highest positioned at upper left, the submodule capacitor voltage positioned at bottom right is minimum, and from a left side in matrix It is above reduction trend to bottom right submodule capacitor voltage general trend；During control submodule input, excision, need to use up can The higher or lower submodule of capacitance voltage can be inquired soon, therefore is defined inquiry direction and be：
1. from SM11Start to gradually decrease down SMnMInquiry direction be defined as voltage reduce direction；
2. from SMnMStart to gradually rise up to SM11Inquiry direction be defined as voltage rise direction.
Submodule capacitor voltage deviation described in step 4) controls：The control of capacitance voltage deviation needs the moment to exchange electric capacity The voltage submodule devious in different inputs, excision state；In order to further reduce power device switching frequency, work as institute When the two submodule capacitor voltage deviations to be exchanged are less than setting value, then its working condition is not changed；Define the shape that need to exchange jobs Two submodule capacitor voltage difference absolute values of state are δ U；Acceptable maximum deviation permissible value UZ, coordinate sort algorithm to be adjusted System, the modulator approach of bridge arm submodule is as follows under various experiment conditions：
1) submodule quantity that needs are put into is equal with the submodule quantity put into
Bridge arm current iSM>0, then from SM11Start to reduce direction query to voltage, until finding the son in input state Module, and from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes；
Bridge arm current iSM<0, then from SM11Start to reduce direction query to voltage, until finding the son in excision state Module, and from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes；
2) the submodule δ that should increase input is N number of
Bridge arm current iSM>0, from SMnMStart to raise direction query to voltage, if running into the submodule in excision state Then put into, until the input N number of submodules of δ；Continue to raise direction query to voltage, until finding the son in excision state Module, and from SM11Start to reduce direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes；
Bridge arm current iSM<0, from SM11Start to reduce direction query to voltage, if running into the submodule in excision state Then put into, until the input N number of submodules of δ；Continue to reduce direction query to voltage, until finding the son in excision state Module, and from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes；
3) it is N number of that input submodule δ should be reduced
Bridge arm current iSM>0, from SM11Start to reduce direction query to voltage, if running into the submodule in input state Then cut off, until the excision N number of submodules of δ；Continue to reduce direction query to voltage, until finding the son in input state Module, and from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes；
Bridge arm current iSM<0, from SMnMStart to raise direction query to voltage, if running into the submodule in input state Then cut off, until the excision N number of submodules of δ；Continue to raise direction query to voltage, until finding the son in input state Module, and from SM11Start to reduce direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
The beneficial effects of the present invention are：Method proposed by the present invention can effectively reduce the amount of calculation of sort algorithm, have Beneficial to the Control System Design being controlled using microprocessor；The fluctuation of transverter submodule capacitor voltage and power are reduced simultaneously Device loss.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright illustrative example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is the ordering strategy schematic diagram of the present invention；
Fig. 2 is the submodule block matrix of the present invention；
The submodule that Fig. 3, Fig. 4 are the present invention inquires about direction；
Fig. 5 is the submodule block sequencing and switching flow chart of the present invention；
Fig. 6 is the submodule submodule packet control trigger waveform of the present invention.
Embodiment
The detailed content and its embodiment of the present invention is further illustrated below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Fig. 6, flexible direct current power transmission system overhead transmission line submodule packet sequencing of the invention modulates plan Slightly, it is optimal for target with capacitance voltage sort operation amount, determine the optimal group quantity of converter bridge arm submodule；Establish packet Submodule capacitor voltage matrix afterwards, and it is carried out longitudinally sort in group, organize between laterally sort, formed with submodule electric capacity electricity Press the submodule block matrix for sequence；Each controlling cycle, according to bridge arm current parameter, according to the submodule voltage side of being raised and lowered To progress submodule input, excision control.The control of submodule capacitor voltage deviation is introduced simultaneously, to prevent capacitance voltage deviation It is excessive and reduce power device switching frequency.Detailed process is as follows：
Each bridge arm submodule is equally divided into M groups, every group is including submodule quantity n
Longitudinal sequence is carried out to n submodule capacitor voltage first in each packet, and it is SM to numberi(i ∈ [1, N]), laterally sorted then carrying out capacitance voltage group to each group sequence number identical submodule, i.e., be all sequence number SM by each groupiSon The capacitance voltage of module is ranked up, and it is SM to numberij(j ∈ [1, M]), control strategy schematic diagram is as shown in Figure 1.
After being sorted between each group same sequence number submodule capacitor voltage group, you can form son according to submodule capacitor voltage size Modular matrix is as shown in Figure 2.In matrix, from top to bottom, submodule capacitor voltage reduces (group internal sort) each row successively；It is each From left to right, submodule capacitor voltage reduces (sorted between group) successively row.
It was determined that the submodule capacitor voltage highest positioned at upper left, the submodule capacitor voltage positioned at bottom right is minimum, and From submodule capacitor voltage general trend left to bottom right it is reduction trend in matrix.During control submodule switching, The higher or lower submodule of capacitance voltage need to be inquired as quickly as possible, therefore it is as shown in Figure 3 to define inquiry direction.
1. from SM11Start to gradually decrease down SMnMInquiry direction as shown in Figure 3, which is defined as voltage, reduces direction.
2. from SMnMStart to gradually rise up to SM11Inquiry direction as shown in Figure 4 is defined as voltage rise direction.
Pressure and Control need the moment to exchange the capacitance voltage submodule devious in different inputs, excision state.For Further reduction power device switching frequency, when the two submodule capacitor voltage deviations to be exchanged are less than certain value, then Its working condition is not changed.The two submodule capacitor voltage difference absolute values for defining the state that need to exchange jobs are δ U；It is acceptable most Large deviation permissible value UZ, coordinate above-mentioned sort algorithm to be modulated, the modulator approach of bridge arm submodule under various experiment conditions It is as follows：
1) submodule quantity that needs are put into is equal with the submodule quantity put into
Bridge arm current iSM>0, then from SM11Start to reduce direction query to voltage, until finding the son in input state Module, and from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
Bridge arm current iSM<0, then from SM11Start to reduce direction query to voltage, until finding the son in excision state Module, and from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
2) the submodule δ that should increase input is N number of
Bridge arm current iSM>0, from SMnMStart to raise direction query to voltage, if running into the submodule in excision state Then put into, until the input N number of submodules of δ.Continue to raise direction query to voltage, until finding the son in excision state Module, and from SM11Start to reduce direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
Bridge arm current iSM<0, from SM11Start to reduce direction query to voltage, if running into the submodule in excision state Then put into, until the input N number of submodules of δ.Continue to reduce direction query to voltage, until finding the son in excision state Module, and from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
3) it is N number of that input submodule δ should be reduced
Bridge arm current iSM>0, from SM11Start to reduce direction query to voltage, if running into the submodule in input state Then cut off, until the excision N number of submodules of δ.Continue to reduce direction query to voltage, until finding the son in input state Module, and from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
Bridge arm current iSM<0, from SMnMStart to raise direction query to voltage, if running into the submodule in input state Then cut off, until the excision N number of submodules of δ.Continue to raise direction query to voltage, until finding the son in input state Module, and from SM11Start to reduce direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange Two submodule switching states, continue to inquire about, until the inquiry of whole submodules finishes.
Specifically sequence and switching flow are as shown in Figure 4 for submodule.
Experiment shows, using the switching frequency that submodule is considerably reduced after above-mentioned control strategy, submodule triggering arteries and veins Punching is as shown in Figure 5.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for the technology of this area For personnel, the present invention can have various modifications and variations.All any modification, equivalent substitution and improvements made for the present invention etc., It should be included in the scope of the protection.

Claims (5)

  1. A kind of 1. flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy, it is characterised in that：Including as follows Step：
    Step 1) is optimal for target with capacitance voltage sort operation amount, determines the optimal group quantity of converter bridge arm submodule；
    The submodule capacitor voltage matrix that step 2) is established after packet, and it is carried out longitudinally sort in group, organize between laterally sort, Form the submodule block matrix using submodule capacitor voltage as sequence；
    The each controlling cycle of step 3), according to bridge arm current parameter, direction is raised and lowered according to submodule voltage, carries out submodule Block input, excision control；
    Step 4) submodule capacitor voltage deviation controls, to prevent that capacitance voltage deviation is excessive and reduce power device switch frequency Rate.
  2. 2. flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy according to claim 1, it is special Sign is：The optimal group quantity of determination converter bridge arm submodule described in step 1) is：Each bridge arm submodule is averaged It is divided into M groups, every group is n including submodule quantity
    <mrow> <mi>n</mi> <mo>=</mo> <mfrac> <mi>N</mi> <mi>M</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>.</mo> </mrow>
  3. 3. flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy according to claim 1, it is special Sign is：Submodule block matrix of the formation using submodule capacitor voltage as sequence described in step 2) be：First to n in each packet Individual submodule capacitor voltage carries out longitudinal sequence, and it is SM to numberi(i ∈ [1, n]), then to each group sequence number identical submodule Laterally sorted between capacitance voltage group, i.e., be all sequence number SM by each groupiThe capacitance voltage of submodule is ranked up, and is numbered and be SMij(j ∈ [1, M])；After being sorted between each group same sequence number submodule capacitor voltage group, you can according to submodule capacitor voltage size Form submodule block matrix；In matrix, each row from top to bottom, organize internal sort, and submodule capacitor voltage reduces successively；Per a line from It is left-to-right, sorted between group, submodule capacitor voltage reduces successively.
  4. 4. flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy according to claim 1, it is special Sign is：Direction is raised and lowered according to submodule voltage described in step 3), carries out submodule input, excision control is：Can To determine, the submodule capacitor voltage highest positioned at upper left, the submodule capacitor voltage positioned at bottom right is minimum, and from a left side in matrix It is above reduction trend to bottom right submodule capacitor voltage general trend；During control submodule input, excision, need to use up can The higher or lower submodule of capacitance voltage can be inquired soon, therefore is defined inquiry direction and be：
    1. from SM11Start to gradually decrease down SMnMInquiry direction be defined as voltage reduce direction；
    2. from SMnMStart to gradually rise up to SM11Inquiry direction be defined as voltage rise direction.
  5. 5. flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy according to claim 1, it is special Sign is：Submodule capacitor voltage deviation described in step 4) controls：The control of capacitance voltage deviation needs the moment to exchange electric capacity The voltage submodule devious in different inputs, excision state；In order to further reduce power device switching frequency, work as institute When the two submodule capacitor voltage deviations to be exchanged are less than setting value, then its working condition is not changed；Define the shape that need to exchange jobs Two submodule capacitor voltage difference absolute values of state are δ U；Acceptable maximum deviation permissible value UZ, coordinate sort algorithm to be adjusted System, the modulator approach of bridge arm submodule is as follows under various experiment conditions：
    1) submodule quantity that needs are put into is equal with the submodule quantity put into
    Bridge arm current iSM>0, then from SM11Start to reduce direction query to voltage, until the submodule in input state is found, And from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes；
    Bridge arm current iSM<0, then from SM11Start to reduce direction query to voltage, until the submodule in excision state is found, And from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes；
    2) the submodule δ that should increase input is N number of
    Bridge arm current iSM>0, from SMnMStart to raise direction query to voltage, by it if the submodule in excision state is run into Input, until the input N number of submodules of δ；Continue to raise direction query to voltage, until the submodule in excision state is found, And from SM11Start to reduce direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes；
    Bridge arm current iSM<0, from SM11Start to reduce direction query to voltage, by it if the submodule in excision state is run into Input, until the input N number of submodules of δ；Continue to reduce direction query to voltage, until the submodule in excision state is found, And from SMnMStart to raise direction query to voltage, until the submodule in input state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes；
    3) it is N number of that input submodule δ should be reduced
    Bridge arm current iSM>0, from SM11Start to reduce direction query to voltage, by it if the submodule in input state is run into Excision, until the excision N number of submodules of δ；Continue to reduce direction query to voltage, until the submodule in input state is found, And from SMnMStart to raise direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes；
    Bridge arm current iSM<0, from SMnMStart to raise direction query to voltage, by it if the submodule in input state is run into Excision, until the excision N number of submodules of δ；Continue to raise direction query to voltage, until the submodule in input state is found, And from SM11Start to reduce direction query to voltage, until the submodule in excision state is found, if δ U>UZ, exchange two submodules Block switching state, continue to inquire about, until the inquiry of whole submodules finishes.
CN201710711566.9A 2017-08-18 2017-08-18 Flexible direct current power transmission system overhead transmission line submodule packet sequencing modulation strategy Pending CN107451756A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109687499A (en) * 2018-12-27 2019-04-26 华北电力大学 A kind of voltage balancing control method of flexible direct current converter station series connection converter valve
CN111478341A (en) * 2020-04-27 2020-07-31 广东明阳龙源电力电子有限公司 Cascade system, static voltage-sharing method and control device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109687499A (en) * 2018-12-27 2019-04-26 华北电力大学 A kind of voltage balancing control method of flexible direct current converter station series connection converter valve
CN111478341A (en) * 2020-04-27 2020-07-31 广东明阳龙源电力电子有限公司 Cascade system, static voltage-sharing method and control device
CN111478341B (en) * 2020-04-27 2022-05-03 广东明阳龙源电力电子有限公司 Cascade system, static voltage-sharing method and control device

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