CN202563019U - Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter - Google Patents
Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter Download PDFInfo
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- CN202563019U CN202563019U CN2012201190391U CN201220119039U CN202563019U CN 202563019 U CN202563019 U CN 202563019U CN 2012201190391 U CN2012201190391 U CN 2012201190391U CN 201220119039 U CN201220119039 U CN 201220119039U CN 202563019 U CN202563019 U CN 202563019U
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Abstract
The invention discloses a utility model of an experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter. The experimental system consists of a rectifier side unit and a main control module connected with the rectifier side unit. The main control module consists of an alternating voltage sensor, an alternating current sensor, a direct voltage sensor, a direct voltage control module, an alternating voltage control module, a reactive power control module, an active power control module, an inner ring current control module, a frequency control module, a two-phase switch, a three-phase switch, a first adder, and a second adder. The utility model employs double closed-loop direct current control for controlling axis d current and axis q current based on the d model and q model of converter station, so as to realizes reactive power control and active power control, reduce steady state error and improve dynamic characteristics. It has simple main circuit topological structure, and is suitable for testing small and medium power systems.
Description
Technical field
The utility model relates to a kind of pilot system of power converter technical field; Belong to wind electric converter control field; Specifically be a kind of busbar voltage and current characteristics and power control characteristic that is used to test the output of current transformer rectifier terminal, to obtain the pilot system of rectification effect preferably.
Background technology
Flexible DC power transmission techniques make use voltage source converter and insulated gate bipolar transistor with self-switching-off capability; Owing to adopt all-controlling power electronics device IGBT as switching device; System has the ability from cut-off current; Can be operated in the passive inverter mode, receiving-end system can be a passive network; Control flexiblely, can simultaneously and control active power and reactive power respectively independently; Employing pulse width modulation controlled technology, switching frequency is higher relatively.This technology is well suited for being applied to fields such as regenerative resource is incorporated into the power networks, distributed power generation is incorporated into the power networks, isolated island is supplied power, urban distribution network is supplied power, asynchronous AC network is interconnected.Because it is exactly that it is intermittent and uncertain that new forms of energy such as wind energy, solar electrical energy generation insert the biggest obstacle of electrical network; And the flexible DC power transmission technology can effectively solve it and is interrupted and problem such as waveform flickering because of uncertain harmonic pollution, voltage that causes, is the best way of generally acknowledging new forms of energy access electrical network.
Retrieval through to the prior art document is found; " Implementation and Control of Distributed PWM Cascaded Multilevel Inverters With Minimal Harmonic Distortion and Common-Mode Voltage " (" realization and control with cascade connection multi-level PWM transmission system of minimum harmonic wave and common mode voltage ") that people such as Poh Chiang Loh deliver on IEEE TRANSACTIONS ON POWER ELECTRONICS periodical has designed a kind of PWM current transformer of many level; With the DSP digital signal processor is core; Through main circuit, testing circuit, trigger circuit and control method are integrated in one, the checking multilevel system triggers algorithm.But also there is following shortcoming in this scheme for the actual product development& testing: 1) system's main circuit partly adopts Y-connection, does not have the public direct-current side, and transmission brings certain difficulty to active power; 2) only for it triggers the proof of algorithm design, capacity is less for pilot system, makes pilot system have certain difficulty to the conversion of actual product; 3) main circuit is the cascade connection multi-level structure, is applicable to the high-power system design, and for the middle low power system, this structure is too complicated, and system cost is too high.To sum up, this experimental system design scheme can not be as the general-purpose platform of current transformer product design and development and performance test, and main circuit topological structure is too complicated, is not suitable for the middle low power system.
Summary of the invention
The purpose of the utility model is to overcome the defective of prior art and a kind of pilot system that detects the offshore wind power flexible DC power transmission current transformer characteristic is provided, and this pilot system main circuit topological structure is simple, is applicable to the middle low power system.
The purpose of the utility model is achieved in that
A kind of pilot system that detects the offshore wind power flexible DC power transmission current transformer characteristic of the utility model; Comprise rectification side unit and the main control module that is attached thereto; Said rectification side unit comprises the isolating transformer that links to each other successively; Reactor and current transformer and input end are connected between isolating transformer and the reactor; The filtration module of output head grounding; Isolating transformer links to each other with the wind energy turbine set AC system; Said main control module comprises AC voltage sensor; AC current sensor; The DC voltage sensor; The DC voltage control module; The alternating voltage control module; The Reactive Power Control module; The active power control module; Interior circular current control module; Frequency control module; Either-or switch; Three elections switch; First adder and second adder; Wherein
The input end of described AC voltage sensor is connected between wind energy turbine set AC system and the isolating transformer, and its output terminal links to each other with the ac voltage input of the input end of described first adder, the ac voltage input of Reactive Power Control module, interior circular current control module, the ac voltage input of frequency control module and the ac voltage input of active power control module respectively;
The input end of described AC current sensor is connected between wind energy turbine set AC system and the isolating transformer, and its output terminal links to each other with the alternating current input end of the alternating current input end of described Reactive Power Control module, interior circular current control module, the alternating current input end of frequency control module and the alternating current input end of active power control module respectively;
The output terminal of described first adder links to each other with the input end of described alternating voltage control module;
The output terminal of described alternating voltage control module links to each other with first moving contact of described either-or switch;
The output terminal of described Reactive Power Control module links to each other with second moving contact of described either-or switch;
The static contact of described either-or switch links to each other with the reactive current input end of described interior circular current control module;
The input end of described DC voltage sensor is connected between described current transformer two output terminals, and its output terminal links to each other with the input end of described second adder;
The output terminal of described second adder links to each other with the input end of described DC voltage control module;
The output terminal of described DC voltage control module links to each other with first moving contact of described three elections switch;
The output terminal of described frequency control module links to each other with second moving contact of described three elections switch;
The output terminal of described active power control module links to each other with the 3rd moving contact of described three elections switch;
The static contact of described three elections switch links to each other with the active current input end of described interior circular current control module;
The output terminal of circular current control module links to each other with the driving signal input of described converter in described.
Above-mentioned a kind of pilot system that detects the offshore wind power flexible DC power transmission current transformer characteristic, wherein, described filtration module comprises the resistance and the electric capacity of series connection successively, an end ground connection of described resistance.
The utility model compared with prior art has following beneficial effect:
1. adopt double-close-loop direct to connect Current Control, control the d axle respectively based on the dq model of current conversion station and realize control respectively, reduced the steady-state error of controlling unit, the perfect dynamic perfromance of controlling unit meritorious and reactive power with the q shaft current.Simultaneously, solved offshore wind farm since its intermittent and uncertain and network process in the harmonic pollution, the voltage that cause be interrupted and problem such as waveform flickering;
2. utilize this pilot system, can test busbar voltage, current characteristics and the power control characteristic of rectifier terminal output, satisfy rectification control requirement, and main circuit topological structure is simple, is applicable to the middle low power system.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
To combine accompanying drawing that the utility model is described further below.
See also Fig. 1; The pilot system of the utility model detection offshore wind power flexible DC power transmission current transformer characteristic has been shown among the figure; Comprise rectification side unit and the main control module 2 that is attached thereto; The rectification side unit comprises the isolating transformer 12 that links to each other successively; Reactor 13 and current transformer 14 and input end are connected between isolating transformer 12 and the reactor 13; The filtration module 15 of output head grounding; Isolating transformer 12 links to each other with wind energy turbine set AC system 11; Main control module 2 comprises AC voltage sensor 21; AC current sensor 22; DC voltage sensor 23; First adder 24; Second adder 25; Either-or switch 26; Three elections switch 27; Alternating voltage control module 3; DC voltage control module 6; Reactive Power Control module 4; Active power control module 8; Interior circular current control module 5 and frequency control module 7; Wherein
The input end of AC voltage sensor 21 is connected between wind energy turbine set AC system 11 and the isolating transformer 12, and its output terminal links to each other with the ac voltage input of the input end of first adder 24, the ac voltage input of Reactive Power Control module 4, interior circular current control module 5, the ac voltage input of frequency control module 7 and the ac voltage input of active power control module 8 respectively;
The input end of AC current sensor 22 is connected between wind energy turbine set AC system 11 and the isolating transformer 12, and its output terminal links to each other with the alternating current input end of the alternating current input end of Reactive Power Control module 4, interior circular current control module 5, the alternating current input end of frequency control module 7 and the alternating current input end of active power control module 8 respectively;
The output terminal of first adder 24 links to each other with the input end of alternating voltage control module 3;
The output terminal of alternating voltage control module 3 links to each other with first moving contact of either-or switch 26;
The output terminal of Reactive Power Control module 4 links to each other with second moving contact of either-or switch 26;
The static contact of either-or switch 26 links to each other with the reactive current input end of interior circular current control module 5;
The input end of DC voltage sensor 23 is connected between 14 liang of output terminals of current transformer, and its output terminal links to each other with the input end of second adder 25;
The output terminal of second adder 25 links to each other with the input end of DC voltage control module 6;
The output terminal of DC voltage control module links to each other with first moving contact of three elections switch 27;
The output terminal of frequency control module 7 links to each other with second moving contact of three elections switch 27;
The output terminal of active power control module 8 links to each other with the 3rd moving contact of three elections switch 27;
The static contact of three elections switch 27 links to each other with the active current input end of interior circular current control module 5;
The output terminal of interior circular current control module 5 links to each other with the driving signal input of converter 14.
In the pilot system of above-mentioned detection offshore wind power flexible DC power transmission current transformer characteristic, filtration module 15 comprises the resistance and the electric capacity of series connection successively, wherein an end ground connection of resistance.
The utility model adopts double-close-loop direct to connect Current Control, controls the d axle respectively based on the dq model of current conversion station and realizes the control respectively to meritorious and reactive power with the q shaft current, has reduced the steady-state error of controlling unit, the perfect dynamic perfromance of controlling unit.Simultaneously, solved offshore wind farm since its intermittent and uncertain and network process in the harmonic pollution, the voltage that cause be interrupted and problem such as waveform flickering.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technician in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.
Claims (2)
1. pilot system that detects the offshore wind power flexible DC power transmission current transformer characteristic; Comprise rectification side unit and the main control module that is attached thereto; Said rectification side unit comprises that isolating transformer, reactor and the current transformer and the input end that link to each other successively are connected between isolating transformer and the reactor, the filtration module of output head grounding; Isolating transformer links to each other with the wind energy turbine set AC system; It is characterized in that; Said main control module comprises AC voltage sensor, AC current sensor, DC voltage sensor, DC voltage control module, alternating voltage control module, Reactive Power Control module, active power control module, interior circular current control module, frequency control module, either-or switch, three elections switch, first adder and second adder, wherein
The input end of described AC voltage sensor is connected between wind energy turbine set AC system and the isolating transformer, and its output terminal links to each other with the ac voltage input of the input end of described first adder, the ac voltage input of Reactive Power Control module, interior circular current control module, the ac voltage input of frequency control module and the ac voltage input of active power control module respectively;
The input end of described AC current sensor is connected between wind energy turbine set AC system and the isolating transformer, and its output terminal links to each other with the alternating current input end of the alternating current input end of described Reactive Power Control module, interior circular current control module, the alternating current input end of frequency control module and the alternating current input end of active power control module respectively;
The output terminal of described first adder links to each other with the input end of described alternating voltage control module;
The output terminal of described alternating voltage control module links to each other with first moving contact of described either-or switch;
The output terminal of described Reactive Power Control module links to each other with second moving contact of described either-or switch;
The static contact of described either-or switch links to each other with the reactive current input end of described interior circular current control module;
The input end of described DC voltage sensor is connected between described current transformer two output terminals, and its output terminal links to each other with the input end of described second adder;
The output terminal of described second adder links to each other with the input end of described DC voltage control module;
The output terminal of described DC voltage control module links to each other with first moving contact of described three elections switch;
The output terminal of described frequency control module links to each other with second moving contact of described three elections switch;
The output terminal of described active power control module links to each other with the 3rd moving contact of described three elections switch;
The static contact of described three elections switch links to each other with the active current input end of described interior circular current control module;
The output terminal of circular current control module links to each other with the driving signal input of described converter in described.
2. a kind of pilot system that detects the offshore wind power flexible DC power transmission current transformer characteristic as claimed in claim 1 is characterized in that, described filtration module comprises the resistance and the electric capacity of series connection successively, an end ground connection of described resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201190391U CN202563019U (en) | 2012-03-27 | 2012-03-27 | Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter |
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| CN2012201190391U CN202563019U (en) | 2012-03-27 | 2012-03-27 | Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter |
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| CN202563019U true CN202563019U (en) | 2012-11-28 |
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| CN2012201190391U Expired - Lifetime CN202563019U (en) | 2012-03-27 | 2012-03-27 | Experimental system for testing characteristics of offshore wind electric flexible direct current transmission converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728508A (en) * | 2013-12-05 | 2014-04-16 | 国家电网公司 | Device and method for testing steady-state operation of MMC flexible direct current sub-module |
| CN104007398A (en) * | 2014-06-12 | 2014-08-27 | 国家电网公司 | Test method for transverter subunit full working condition closed-loop control |
| CN109709434A (en) * | 2019-01-29 | 2019-05-03 | 上海交通大学 | The test circuit of cascade converter multi-tool block multi-state simulation |
| CN109709363A (en) * | 2019-01-29 | 2019-05-03 | 上海交通大学 | The control method and system of cascade converter multi-tool block multi-state simulation device |
-
2012
- 2012-03-27 CN CN2012201190391U patent/CN202563019U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728508A (en) * | 2013-12-05 | 2014-04-16 | 国家电网公司 | Device and method for testing steady-state operation of MMC flexible direct current sub-module |
| CN104007398A (en) * | 2014-06-12 | 2014-08-27 | 国家电网公司 | Test method for transverter subunit full working condition closed-loop control |
| CN104007398B (en) * | 2014-06-12 | 2016-08-31 | 国家电网公司 | A kind of inverter subelement full working scope closed loop control test method |
| CN109709434A (en) * | 2019-01-29 | 2019-05-03 | 上海交通大学 | The test circuit of cascade converter multi-tool block multi-state simulation |
| CN109709363A (en) * | 2019-01-29 | 2019-05-03 | 上海交通大学 | The control method and system of cascade converter multi-tool block multi-state simulation device |
| CN109709434B (en) * | 2019-01-29 | 2020-06-16 | 上海交通大学 | Test circuit for multi-submodule and multi-working-condition simulation of cascaded converter |
| CN109709363B (en) * | 2019-01-29 | 2020-06-16 | 上海交通大学 | Control method and system of cascade type converter multi-submodule multi-working-condition simulation device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121128 |