CN102270925B - Insulation coordinating method of module unit of modularized multi-level voltage source converter - Google Patents
Insulation coordinating method of module unit of modularized multi-level voltage source converter Download PDFInfo
- Publication number
- CN102270925B CN102270925B CN201110225939.4A CN201110225939A CN102270925B CN 102270925 B CN102270925 B CN 102270925B CN 201110225939 A CN201110225939 A CN 201110225939A CN 102270925 B CN102270925 B CN 102270925B
- Authority
- CN
- China
- Prior art keywords
- module unit
- modular unit
- metallic support
- voltage source
- equipotential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009413 insulation Methods 0.000 title claims abstract description 19
- 239000011800 void material Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 8
- 230000001052 transient effect Effects 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 108010022579 ATP dependent 26S protease Proteins 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000005684 electric field Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 230000001172 regenerating effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003012 network analysis Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an insulation coordinating method of a module unit of a modularized multi-level voltage source converter, and belongs to the field of alternating current/direct current conversion and power transmission and distribution of a voltage source converter. A voltage source converter (VSC) is adopted as the module unit; when the insulating method provided by the invention is adopted, all equipment of the module unit can meet the insulating requirement of the system and exert self characteristics of the equipment to the maximum extent simultaneously, the cost of the module unit and the structural design difficulty are reduced, and the running robustness of the VSC system is improved; and the electric field of the module unit is distributed uniformly, and the influence of primary main equipment on a secondary control and protection system is reduced. The insulating method comprises the steps of: selecting insulating equipment and metal equipment according to the parameters of the module unit in various working conditions, and performing the structural design and electric design on the module unit to ensure the module unit to operate safely, reliably and economically under the voltage stress.
Description
Technical field
The invention belongs to ac-dc conversion and the power transmission and distribution field of voltage source converter, specifically relate to a kind of insulation coordination method of modularized multi-level voltage source transverter module unit.
Background technology
In order to alleviate the problems such as energy shortage, environmental pollution, large-scale developing and utilizing of the regenerative resources such as wind energy, solar energy is trend of the times.But the regenerative resource such as wind energy, solar energy has dispersiveness, intermittent shortcoming, wind power generation and photovoltaic generation can bring a series of problem to electric power system when adopting traditional UHV AC transmission technique or conventional HVDC Transmission Technology grid-connected, and this problem becomes increasingly conspicuous the expansion along with renewable energy utilization scale.
Technology of HVDC based Voltage Source Converter is a kind of new technology based on full-control type device and pulse-width modulation, and voltage source converter (voltage source converter is called for short VSC) is the Core equipment of flexible DC power transmission system.Control mode and the operational mode of flexible DC power transmission are flexible, and the active power of transmission and reactive power can independently be controlled, and the operation of the system of applicable middle low power, and existing 12 flexible DC power transmission engineerings are in operation at present.Generating electricity by way of merging two or more grid systems of the regenerative resources such as the wind-force of the very applicable different scales of the technical and economic characteristic that flexible DC power transmission was had that the VSC of take is convertor unit, solar energy.The regenerative resource that voltage source converter can the meet different scales demand of generating electricity by way of merging two or more grid systems, also can meet the requirement of safe, stable, the economical operation of whole electrical network, avoids the adverse effect because adopting other power transmission modes to produce electrical network.
Modular multi-electrical-level voltage source current converter is a kind of New Topological of VSC, and being effectively to increase converter level output number, reduction output waveform aberration rate at present, can be applicable to again the power conversion of high-power, the topological structure of transmission occasion.Modular multi-electrical-level voltage source current converter; both positive and negative polarity cascade by the identical basic functional units of a series of 26S Proteasome Structure and Functions (abbreviation modular unit) forms, the organic whole of primary equipment, linear quadratic control protection system, structure, cooling system and shielding harness that has been integrated.Each modular unit is a complete VSC, can realize all functions such as unsteady flow, communication; Simultaneously even hundreds of mutual cascades of modular unit controlling by system coordination of independent, several in modular unit structure, dozens of, realize the change of current function of high voltage grade, relatively high power.
The VSC modular unit of above-mentioned this high integration, its insulating method is most important, and insulating method is not only related to the safety of modular unit equipment of itself, even can affect whole system and even can coupled electric power system reliability service.Design a good insulation coordination scheme, be conducive to give full play to the ability to work of device itself, the cost that reduces modular unit and structural design difficulty, improve the robustness of VSC system operation.This is also by the commercialization of propulsion module blocking voltage with multiple levels source converter technology faster and better.Yet the professional and technology of insulation coordination design is all very strong; not only to comprehensively analyze complex electromagnetic environment that maximum steady state voltage stress under modular unit steady state condition, the maximum transient under transient operating mode and loss surge characteristic and device speed-sensitive switch cause etc., also need protection logic and the protection configuration parameter of adjustment System repeatedly with designer.
Summary of the invention
The present invention sets by modular unit voltage stress, Analysis of Electromagnetic Environment and system configuration, a kind of insulation coordination method of modularized multi-level voltage source transverter module unit is provided, when described insulating method makes each modular unit of voltage source converter all can meet system insulation requirement, bring into play to greatest extent self-characteristic, reduce cost and the structural design difficulty of modular unit, improve the robustness of VSC system operation, also make in addition modular unit Electric Field Distribution balanced, reduced the impact on secondary control system of main equipment.
For achieving the above object, the technical scheme that the present invention takes is as follows:
A kind of insulation coordination method of modularized multi-level voltage source transverter module unit, described modular unit is formed by the identical submodule both positive and negative polarity cascade of 26S Proteasome Structure and Function, its improvements are to be provided with insulating material between described adjacent submodule, and modular unit is provided with metallic support and radome; Described insulation coordination method step is as follows:
1) the maximum steady state withstand voltage U under the various operating conditions in determination module unit
surely, maximum transient withstand voltage U
temporarily, maximum instantaneous overvoltage U
crosswith maximum carrying capacity I
max;
2) selection of insulating material and metallic support:
The surface resistivity R of described insulating material
s> 1.0 * 10
14Ω, specific insulation R
v> 1.0 * 10
14Ω m, water absorption rate < 0.2%; The selection of described metallic support area of section a is according to being:
I wherein
0: unit are ampacity, I
0≤ 2.5A/mm
2;
3) structural design of modular unit:
Minimum creep distance d between adjacent submodule and between submodule and metallic support
1,
D
1=k
1* U
surely* d
0;
K wherein
1: margin of safety, span 1.1-1.3,
D0: unit creepage distance, span 20-25mm/kV;
Minimum air void d between different potentials point in modular unit
4, d
4=max (d
2, d
3);
Wherein:
D
2: maximum switching overvoltage U
switchingcorresponding minimum air void, d
2=k
2* U
switching* d
0,
D
3: maximum lightning overvoltage U
lightingcorresponding minimum air void, d
3=k
3* U
lingting* d
0,
K
2, k
3: margin of safety, span 1.1-1.3;
And then with steep wave overvoltage and protection of arrester level etc., come verification minimum air void whether to meet the demands respectively, if do not meet the demands, get higher value.
4) electrical design of modular unit:
Left end metallic support is adjacent the negative pole equipotential of submodule, and right-hand member metallic support is adjacent the anodal equipotential of submodule;
The radome of modular unit and described left end metallic support equipotential, the radome of modular unit and described right-hand member metallic support equipotential, the negative pole equipotential of M submodule in the middle of the radome of modular unit and described modular unit.
Another optimal technical scheme of the present invention is: modular unit is provided with cooling circuit, the coolant in described cooling circuit and described right-hand member metallic support equipotential.
Another optimal technical scheme of the present invention is: described cooling circuit is installed equipotential pin, and described equipotential pin is for controlling the current potential of coolant.
Owing to having taked technique scheme, compared with prior art, beneficial effect of the present invention is:
1, reduce modular unit cost
When modularization multi-level converter adopts the insulating method of the present invention's proposition, when all meeting system insulation requirement, bring into play to greatest extent the equipment such as modular unit the characteristic of equipment self, the performance utilance that is modular unit improves, meeting under the prerequisite of identical voltage levels, the identical high-power change of current function cost of modular unit;
2, reduce modular unit structural design difficulty
Modular multi-electrical-level voltage source current converter be by several, dozens of even hundreds of the mutual cascades of modular unit form, the characteristic of modular unit self performs to greatest extent, the quantity that forms the modular unit of modular multi-electrical-level voltage source current converter reduces, this has just simplified the requirement to spatial volume of modular unit, reduces modular unit structural design difficulty;
3, improve the robustness of VSC system operation
Insulating method of the present invention, makes adjacent block unit Electric Field Distribution balanced, has reduced the impact on linear quadratic control protection system of main equipment, has guaranteed modular unit safety, reliable and economical operation, improves the robustness of VSC system operation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is modularized multi-level voltage source transverter module unit electric hookup;
Fig. 2 is modularized multi-level voltage source transverter module unit functional structure chart.
Reference numeral:
1-left end metallic support, 2-right-hand member metallic support, 3-insulating material, 4-cooling circuit, 5-left end radome, 6-right-hand member radome, 7-bottom radome, 8-submodule;
U
surely: maximum steady state withstand voltage,
U
temporarily: maximum transient withstand voltage,
U
cross: maximum instantaneous overvoltage,
I
max: maximum carrying capacity,
A: metallic support area of section,
I
0: unit are ampacity,
D: minimum creep distance,
K: margin of safety,
U
switching: maximum switching overvoltage,
U
lighting: maximum lightning overvoltage.
Embodiment
Below in conjunction with example, the present invention will be described in detail.
The object of the invention is to for modularized multi-level voltage source transverter module unit provides a kind of insulating method, when modular unit adopts this insulation coordination scheme, both support equipment safety and system were reliable, fully reduced again the cost of modular unit.
According to the method shown in Fig. 1 (a), modular unit is carried out to network analysis, to determine maximum steady state, transient state and instantaneous overvoltage level and the maximum carrying capacity I of different components and parts actual capabilities tolerances
max; In order to try one's best, discharge capacity is put, the insulating material that option table surface resistivity is high, specific insulation is high and water absorption rate is low in reduction equipment office; Cross-sectional area of conductor area a generally adjusts according to the following formula, wherein unit are ampacity I
0generally be not more than 2.5A/mm
2.
Submodule in modular unit is arranged on several insulating supporting beams in an orderly manner, and a side interconnects by wire, and opposite side interconnects by water route.According to the maximum steady state withstand voltage U between adjacent submodule and between submodule and left and right end metallic support
n, determine between adjacent submodule and submodule and left and right end metallic support between minimum creep distance d
1.For security consideration, generally reserve certain margin of safety k
1(generally getting 1.1～1.3), the creep distance d of unit
0generally get 20～25mm/kV.
d
1＝k
1*U
N*d
0
According to the maximum transient between different potentials point and instantaneous overvoltage in module, determine the minimum air void d between different potentials point
4.During calculating generally respectively with switching overvoltage U
switchingwith lightning overvoltage U
lightingcalculate its corresponding minimum air void d
2and d
3, the two gets its higher value, and reserved certain margin of safety k
2, k
3(generally getting 11～1.3), and then carry out verification with steep wave overvoltage, protection of arrester level etc.
d
4＝max(d
2，d
3)
d
2＝k
2*U
switching*d
0
d
3＝k
3*U
lingting*d
0
Modularized multi-level voltage source transverter module unit functional structure chart as shown in Figure 2, the left end metallic support 1 of modular unit is adjacent the negative pole equipotential of submodule 8, and right-hand member metallic support 2 is adjacent the anodal equipotential of submodule 8.
The cooling circuit 4 of modular unit is installed equipotential pin, and acting as of equipotential pin guarantees coolant water and modular unit right-hand member metallic support 2 equipotentials.
Radome 5 and left end metallic support 1 equipotential of modular unit; Radome 6 and right-hand member metallic support 2 equipotentials of modular unit; The radome 7 of modular unit and the negative pole equipotential of M submodule 8 of this modular unit, wherein
round the number of the submodule 8 that N representation module unit comprises.
According to specific exemplary embodiment, invention has been described herein.It will be apparent under not departing from the scope of the present invention, carrying out to one skilled in the art suitable replacement or revise.Exemplary embodiment is only illustrative, rather than the restriction to scope of the present invention, and scope of the present invention is defined by appended claim.
Claims (3)
1. the insulation coordination method of a modularized multi-level voltage source transverter module unit, described modular unit is formed by the identical submodule of 26S Proteasome Structure and Function (8) both positive and negative polarity cascade, it is characterized in that being provided with insulating material (3) between adjacent described submodule (8), modular unit is provided with metallic support (1,2) and radome 5,6,7; Described insulation coordination method step is as follows:
1) the maximum steady state withstand voltage U under the various operating conditions in determination module unit
surely, maximum transient withstand voltage U
temporarily, maximum instantaneous overvoltage U
crosswith maximum carrying capacity I
max;
2) selection of insulating material (3) and metallic support (1,2):
The surface resistivity R of described insulating material (3)
s> 1.0 * 10
14Ω, specific insulation R
v> 1.0 * 10
14Ω m, water absorption rate < 0.2%;
The selection of described metallic support (1,2) area of section a is according to being:
I wherein
0: unit are ampacity, I
0≤ 2.5A/mm
2;
3) structural design of modular unit:
Minimum creep distance d between adjacent submodule (8) and between submodule (8) and metallic support (1,2)
1,
D
1=k
1* U
surely* d
0;
K wherein
1: margin of safety, span 1.1-1.3,
D
0: unit creepage distance, span 20-25mm/kV;
Minimum air void d between different potentials point in modular unit
4, d
4=max (d
2, d
3);
Wherein:
D
2: maximum switching overvoltage U
switchingcorresponding minimum air void, d
2=k
2* U
switching* d
0,
D
3: maximum lightning overvoltage U
lightingcorresponding minimum air void, d
3=k
3* U
lingting* d
0,
K
2, k
3: margin of safety, span 1.1-1.3;
And then with steep wave overvoltage and protection of arrester level etc., come verification minimum air void whether to meet the demands respectively, if do not meet the demands, get higher value;
4) electrical design of modular unit:
Left end metallic support (1) is adjacent the negative pole equipotential of submodule (8), and right-hand member metallic support (2) is adjacent the anodal equipotential of submodule (8);
Radome 5 and described left end metallic support (1) equipotential of modular unit, radome 6 and described right-hand member metallic support (2) equipotential of modular unit, the radome 7 of modular unit and the negative pole equipotential of middle M the submodule of described modular unit.
2. the insulation coordination method of a kind of modularized multi-level voltage source transverter module unit as claimed in claim 1, it is characterized in that modular unit is provided with cooling circuit (4), coolant and described right-hand member metallic support (2) equipotential in described cooling circuit (4).
3. the insulation coordination method of a kind of modularized multi-level voltage source transverter module unit as claimed in claim 2, is characterized in that described cooling circuit (4) installation equipotential pin, and described equipotential pin is for controlling the current potential of coolant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110225939.4A CN102270925B (en) | 2011-08-08 | 2011-08-08 | Insulation coordinating method of module unit of modularized multi-level voltage source converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110225939.4A CN102270925B (en) | 2011-08-08 | 2011-08-08 | Insulation coordinating method of module unit of modularized multi-level voltage source converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102270925A CN102270925A (en) | 2011-12-07 |
| CN102270925B true CN102270925B (en) | 2014-02-12 |
Family
ID=45053118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110225939.4A Active CN102270925B (en) | 2011-08-08 | 2011-08-08 | Insulation coordinating method of module unit of modularized multi-level voltage source converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102270925B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063903B (en) * | 2012-12-10 | 2014-02-19 | 国网智能电网研究院 | Overvoltage computing method of modular multi-level converter |
| CN103336163B (en) * | 2013-06-18 | 2015-06-17 | 中国科学院电工研究所 | Converter-valve AC/DC voltage test circuit of flexible high-voltage DC transmission system |
| CN112532072B (en) * | 2020-03-26 | 2022-03-29 | 南京南瑞继保电气有限公司 | Modular multi-level submodule, valve tower and alternating current withstand voltage test method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242132A (en) * | 2007-12-05 | 2008-08-13 | 国网直流工程建设有限公司 | Trigger angle control policy for ultra-high voltage DC startup |
| CN101995557A (en) * | 2010-10-14 | 2011-03-30 | 中国科学院等离子体物理研究所 | Method for testing bearing capability of short trouble in high-power converter |
| CN102130609A (en) * | 2011-03-10 | 2011-07-20 | 中国电力科学研究院 | Method for realizing insulation coordination of basic functional units of voltage source converter (VSC) based on half bridge circuit |
-
2011
- 2011-08-08 CN CN201110225939.4A patent/CN102270925B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242132A (en) * | 2007-12-05 | 2008-08-13 | 国网直流工程建设有限公司 | Trigger angle control policy for ultra-high voltage DC startup |
| CN101995557A (en) * | 2010-10-14 | 2011-03-30 | 中国科学院等离子体物理研究所 | Method for testing bearing capability of short trouble in high-power converter |
| CN102130609A (en) * | 2011-03-10 | 2011-07-20 | 中国电力科学研究院 | Method for realizing insulation coordination of basic functional units of voltage source converter (VSC) based on half bridge circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102270925A (en) | 2011-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Qu et al. | Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai | |
| Liu et al. | Coordinated control of distributed energy storage system with tap changer transformers for voltage rise mitigation under high photovoltaic penetration | |
| CN105896603B (en) | A kind of wind-solar-storage joint electricity generation system and method | |
| Byeon et al. | A research on the characteristics of fault current of DC distribution system and AC distribution system | |
| Katić et al. | Impact of V2G operation of electric vehicle chargers on distribution grid during voltage dips | |
| CN102270925B (en) | Insulation coordinating method of module unit of modularized multi-level voltage source converter | |
| WO2024093152A1 (en) | Distributed voltage clamping method for 100%-new-energy sending-end power grid | |
| Yaqobi et al. | Control and energy management strategy of standalone DC microgrid cluster using PV and battery storage for rural application | |
| Wang et al. | Simulation research on the operation characteristics of a DC microgrid | |
| Wen et al. | Control and protection of dc microgird with battery energy storage system | |
| Sonder et al. | Voltage analysis on MV/LV distribution networks with the integration of DC fast chargers | |
| Li et al. | A Comparison of Energy Efficiency in AC and DC Microgrid with New Energy | |
| Zhang et al. | An energy management strategy based on state machine with power compensation for photovoltaic-PEMFC-lithium battery power system | |
| Varghese | Integration of Distributed Generation System and Electric Vehicle Charger in V2G mode for Grid Voltage Sag Mitigation | |
| Mrehel et al. | Effect of Large-scale PV system on Load Flow short circuit and harmonics in Libyan Electrical Network | |
| Lao et al. | Power electronic converters for low-frequency HVac transmission: functions and challenges | |
| Meridji et al. | High-voltage dc conversion: Boosting transmission capacity in the grid | |
| He et al. | Simulation of large-scale energy storage to improve high-voltage DC stability | |
| Alsharif et al. | Photovoltaic generators interfacing a dc micro-grid: design considerations for a double-stage boost power converter system | |
| Hou et al. | Design of smart energy converter with distribution and storage integrated for LVDC distribution grid | |
| Salehi et al. | Sizing and operation of BESS to increase loadability of a weak distribution feeder | |
| Yang et al. | The DC Microgrid-Based SoC Adaptive Droop Control Algorithm | |
| de Toledo Silva et al. | Use of DC/DC converters modeled as AC-DC converters in HVDC Grids | |
| CN215990216U (en) | Offshore booster station electrical system and offshore wind farm system | |
| Zhou et al. | Study on the fault ride through control for AC-DC hybrid distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130520 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130520 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: State Grid Corporation of China Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |