CN104600735A - Circulating current restraining method based on flexible direct current transmission control system - Google Patents
Circulating current restraining method based on flexible direct current transmission control system Download PDFInfo
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- CN104600735A CN104600735A CN201510009328.4A CN201510009328A CN104600735A CN 104600735 A CN104600735 A CN 104600735A CN 201510009328 A CN201510009328 A CN 201510009328A CN 104600735 A CN104600735 A CN 104600735A
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- H02J13/0096—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
A circulating current restraining method based on a flexible direct current transmission control system belongs to the technical field of distributed power generation. The method carries out circulation suppression through a coordination controller; each local controller sends the voltage reference, the frequency reference and the working mode of the local controller to the coordination controller through communication, the coordination controller comprehensively calculates the voltage reference and the frequency reference which are output by each local control system, the voltage reference and the frequency reference are sent to each local control system through communication, the local control systems carry out adjustment according to the voltage reference and the frequency reference sent by the coordination controller, and therefore the purpose of restraining circulation current is achieved, and the control method has good universality.
Description
Technical field:
The invention belongs to field of power, relate to the electricity generation system containing distributed power source, be specially a kind of circulation inhibition method based on flexible direct-current transmission control system.
Background technology:
Along with the development of distributed energy generation technology, the electricity generation system containing distributed power source is suggested as a kind of organizational form that can play distributed power source potential.Containing the electricity generation system of distributed power source as a controllable, can realize from controlling, protection and energy management, effectively can coordinate the relation with bulk power grid, realize the fast development of electrical network.
Containing electricity generation system the supplementing not only as bulk power grid of distributed power source, and as independently system cloud gray model, the developing direction that electric power system is new can be represent.Along with the development of power control techniques, power system capacity is increasing, and the capacity development of converter corresponding with it shows slightly delayed.Electricity generation system containing distributed power source is usually operated under net state, because converter holds quantitative limitation, must cause needing many cover converters simultaneously from the situation of network operation.
Many converters remains from the circulation problem during network operation bottleneck that restriction develops containing the electricity generation system of distributed power source simultaneously.During electricity generation system independent operating containing distributed power source, if many converters can not synchronous operation, by the stability that influential system runs, time serious, system crash can be caused.
Summary of the invention:
The present invention proposes a kind of circulation inhibition method based on flexible direct-current transmission control system, circulation when can eliminate the electricity generation system independent operating containing distributed power source easily between many converters.
The present invention is concrete by the following technical solutions
Based on a circulation inhibition method for flexible direct-current transmission control system, it is characterized in that:
Circulation inhibition method based on flexible direct-current transmission control system is configured with tuning controller, by high speed fibre respectively with the Converter controller in flexible direct current power transmission system, namely Local Controller carries out communication, complete data interaction, all converter ACs are connected in parallel on ac bus, tuning controller calculates voltage reference value and frequency reference respectively according to the difference of control model, send to Converter controller by optical fiber, converter is according to the output voltage of the reference value adjustment received self and output frequency.
Based on a circulation inhibition method for flexible direct-current transmission control system, it is characterized in that, said method comprising the steps of:
Based on a circulation inhibition method for flexible direct-current transmission control system, it is characterized in that, said method comprising the steps of:
(1) each Converter controller in flexible direct-current transmission control system, namely each Local Controller by the mode of operation of converter, voltage reference value and frequency reference by high speed fibre gives tuning controller; Mode of operation comprises constant frequency and constant voltage and controls (V/F control) pattern, droop control pattern, when all converters are operated in constant frequency and constant voltage control model, enter step (2), when all converters are operated in droop control pattern, enter step (3);
(2) when all converters are operated in constant frequency and constant voltage control model, each converter adopts opened loop control, and each converter voltage reference value and frequency reference issue by tuning controller is unified; Tuning controller gathers ac bus voltage, carries out closed-loop control, expects to calculate each converter required voltage reference value and corresponding angle value with the three-phase voltage collected, be handed down to each converter by high speed fibre according to voltage;
(3) when all converters are operated in droop control pattern, each converter closed loop controls, Local Controller corresponding to each converter adjusts the output frequency of each converter automatically according to the meritorious sagging curve of load active power and setting, if output frequency exceeds the frequency range of setting, then need to adjust meritorious frequency droop curve, make the output frequency of converter in the frequency range of setting, simultaneously Local Controller is by the frequency reference after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (4);
(4) when converter is operated in droop control control model, each converter closed loop controls, the Local Controller that each converter is corresponding adjusts output voltage automatically according to the idle sagging curve of reactive load power and setting, if output voltage exceeds the voltage range of setting, then need adjustment reactive voltage sagging curve, make output voltage in the scope of setting, simultaneously Local Controller is by the voltage reference value after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (5);
(5) after tuning controller receives frequency reference that each converter sends, voltage reference value and mode of operation, the voltage reference value send the converter being operated in sagging pattern and frequency reference are averaged, then mean value is handed down to Local Controller corresponding to each converter by high speed fibre, then enters step (6);
(6) voltage reference value that issues according to tuning controller of each converter and the automatic regulation output voltage of frequency reference and frequency, now each Local Controller independently carries out closed-loop control.
Beneficial effect of the present invention
Present invention achieves the parallel running of each converter during the electricity generation system independent operating containing distributed power source, improve the reliability of power supply.
The present invention, when converter is in VF control model, by tuning controller unified calculation Voltage Reference and frequency reference, effectively reduces the circulation between each converter.
The present invention, when converter is in droop control, is averaged process by tuning controller to the Voltage Reference of each converter and frequency reference, the circulation between each converter that effectively inhibit sagging operation.
Control method that the present invention carries has universality.
Accompanying drawing explanation
Fig. 1 is tuning controller of the present invention and Local Controller communication connection diagram;
Fig. 2 is VF control flow schematic diagram of the present invention;
Fig. 3 is droop control frequency inverter control flow schematic diagram of the present invention;
Fig. 4 is droop control converter voltage control schematic flow sheet of the present invention;
Tuning controller control flow schematic diagram when Fig. 5 is droop control of the present invention;
Converter adjustment schematic flow sheet when Fig. 6 is droop control of the present invention.
Embodiment
According to Figure of description, technical scheme of the present invention is stated further in detail below.
Circulation inhibition method based on flexible direct-current transmission control system is configured with tuning controller, by high speed fibre respectively with the Converter controller in flexible direct current power transmission system, namely Local Controller carries out communication, complete data interaction, all converter ACs are connected in parallel on ac bus, tuning controller calculates ac bus voltage reference value and frequency reference respectively in real time according to the difference of control model, send to Converter controller by optical fiber, Converter controller is according to the output voltage of the reference value adjustment received self and output frequency.Described method comprises the steps:
(1) each Converter controller in flexible direct-current transmission control system, namely each Local Controller by the mode of operation of converter, voltage reference value and frequency reference by high speed fibre gives tuning controller; Mode of operation comprises constant frequency and constant voltage and controls (V/F control) pattern, droop control pattern, when all converters are operated in constant frequency and constant voltage control model, enter step (2), when all converters are operated in droop control pattern, enter step (3);
Fig. 1 is tuning controller of the present invention and Local Controller communication connection diagram.Tuning controller is connected by high speed fibre with each Local Controller, realizes the mutual fast of information.Interactive information comprises the mode of operation of voltage reference value, frequency reference and converter, and mode of operation comprises constant frequency and constant voltage control, droop control.Tuning controller and Local Controller all carry out data interaction at each Sampling interrupt, to ensure the real-time of data.
(2) when all converters are operated in constant frequency and constant voltage control model, each converter adopts opened loop control, and each converter voltage reference value and frequency reference issue by tuning controller is unified; Tuning controller gathers ac bus voltage, carries out closed-loop control, expects to calculate each converter required voltage reference value and corresponding angle value with the three-phase voltage collected, be handed down to each converter by high speed fibre according to voltage;
Fig. 2 is constant frequency and constant voltage control flow schematic diagram of the present invention.Described control method is when converter is operated in constant frequency and constant voltage control model, and each converter adopts opened loop control, and voltage and frequency reference are issued by tuning controller; Tuning controller collects ac bus three-phase voltage, and expect poor with voltage, difference calculates the voltage reference value of converter through pi regulator; Then current angle is calculated according to frequency reference; Finally the voltage reference value calculated, frequency reference and angle value are handed down to each converter.AC three-phase voltage collection, voltage reference value calculate, frequency reference calculates and issues and completes in a control cycle.
(3) when all converters are operated in droop control pattern, each converter closed loop controls, Local Controller corresponding to each converter adjusts the output frequency of each converter automatically according to the meritorious sagging curve of load active power and setting, if output frequency exceeds the frequency range of setting, then need to adjust meritorious frequency droop curve, make the output frequency of converter in the frequency range of setting, simultaneously Local Controller is by the frequency reference after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (4);
Fig. 3 is droop control frequency inverter control flow schematic diagram of the present invention.Described control method is when converter is operated in droop control pattern, and each converter independently carries out closed-loop control.The active power that Local Controller exports according to AC three-phase voltage and Current calculation self, according to active power frequency droop curve adjustment converter output frequency; Then judge whether output frequency exceedes the frequency range of setting, if exceed the frequency range of setting, it is poor actual frequency and frequency to be expected, difference exports the frequency reference after adjustment through pi regulator, make actual frequency maintain in the frequency range of setting, give tuning controller by the frequency reference after adjustment simultaneously.
(4) when converter is operated in droop control control model, each converter closed loop controls, the Local Controller that each converter is corresponding adjusts output voltage automatically according to the idle sagging curve of reactive load power and setting, if output voltage exceeds the voltage range of setting, then need adjustment reactive voltage sagging curve, make output voltage in the scope of setting, simultaneously Local Controller is by the voltage reference value after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (5);
Fig. 4 is droop control converter voltage control schematic flow sheet of the present invention.Described control method is when converter is operated in droop control pattern, and each converter independently carries out closed-loop control.The reactive power that converter exports according to AC three-phase voltage Current calculation self, according to reactive voltage sagging curve adjustment inverter output voltage; Then judge whether output voltage exceedes the voltage range of setting, if exceed the voltage range of setting, it is poor virtual voltage and voltage to be expected, difference exports the voltage reference value after adjustment through pi regulator, make voltage maintain in the scope of setting, give tuning controller by the voltage reference value after adjustment simultaneously.
(5) after tuning controller receives frequency reference that each converter sends, voltage reference value and mode of operation, the voltage reference value send the converter being operated in sagging pattern and frequency reference are averaged, then mean value is handed down to Local Controller corresponding to each converter by high speed fibre, then enters step (6);
Tuning controller control flow schematic diagram when Fig. 5 is droop control of the present invention.Described control method, after tuning controller receives the operation information of each Converter controller transmission, first judges whether converter is in droop control pattern; If it is the voltage reference value that this converter send and frequency reference are added up summation, until the converter Voltage Reference being in sagging pattern by all and frequency reference have added up, finally accumulated value be averaging and be handed down to the converter being respectively in droop control pattern.
(6) voltage reference value that issues according to tuning controller of each converter and the automatic regulation output voltage of frequency reference and frequency, now each Local Controller independently carries out closed-loop control;
Converter adjustment schematic flow sheet when Fig. 6 is droop control of the present invention.After converter receives the Voltage Reference and frequency reference that tuning controller issues, if judge self to be in droop control pattern, then according to reference value adjustment output voltage and frequency, otherwise abandon this data.
Claims (2)
1., based on a circulation inhibition method for flexible direct-current transmission control system, it is characterized in that:
Circulation inhibition method based on flexible direct-current transmission control system is configured with tuning controller, by high speed fibre respectively with the Converter controller in flexible direct current power transmission system, namely Local Controller carries out communication, complete data interaction, all converter ACs are connected in parallel on ac bus, tuning controller calculates ac bus voltage reference value and frequency reference respectively in real time according to the difference of control model, send to Converter controller by optical fiber, converter is according to the output voltage of the reference value adjustment received self and output frequency.
2. based on a circulation inhibition method for flexible direct-current transmission control system, it is characterized in that, said method comprising the steps of:
(1) each Converter controller in flexible direct-current transmission control system, namely each Local Controller by the mode of operation of converter, voltage reference value and frequency reference by high speed fibre gives tuning controller; Mode of operation comprises constant frequency and constant voltage and controls (V/F control) pattern, droop control pattern, when all converters are operated in constant frequency and constant voltage control model, enter step (2), when all converters are operated in droop control pattern, enter step (3);
(2) when all converters are operated in constant frequency and constant voltage control model, each converter adopts opened loop control, and each converter voltage reference value and frequency reference issue by tuning controller is unified; Tuning controller gathers ac bus voltage, carries out closed-loop control, expects to calculate each converter required voltage reference value and corresponding angle value with the three-phase voltage collected, be handed down to each converter by high speed fibre according to voltage;
(3) when all converters are operated in droop control pattern, each converter closed loop controls, Local Controller corresponding to each converter adjusts the output frequency of each converter automatically according to the meritorious sagging curve of load active power and setting, if output frequency exceeds the frequency range of setting, then need to adjust meritorious frequency droop curve, make the output frequency of converter in the frequency range of setting, simultaneously Local Controller is by the frequency reference after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (4);
(4) when converter is operated in droop control control model, each converter closed loop controls, the Local Controller that each converter is corresponding adjusts output voltage automatically according to the idle sagging curve of reactive load power and setting, if output voltage exceeds the voltage range of setting, then need adjustment reactive voltage sagging curve, make output voltage in the scope of setting, simultaneously Local Controller is by the voltage reference value after adjustment and mode of operation by high speed fibre gives tuning controller, then enters step (5);
(5) after tuning controller receives frequency reference that each converter sends, voltage reference value and mode of operation, the voltage reference value send the converter being operated in sagging pattern and frequency reference are averaged, then mean value is handed down to Local Controller corresponding to each converter by high speed fibre, then enters step (6);
(6) voltage reference value that issues according to tuning controller of each converter and the automatic regulation output voltage of frequency reference and frequency, now each Local Controller independently carries out closed-loop control.
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| CN201510009328.4A CN104600735A (en) | 2015-01-08 | 2015-01-08 | Circulating current restraining method based on flexible direct current transmission control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039718A (en) * | 2017-11-17 | 2018-05-15 | 中国电力科学研究院有限公司 | A kind of improved flexible direct current voltage control method and system |
| CN110086192A (en) * | 2019-03-22 | 2019-08-02 | 南方电网科学研究院有限责任公司 | Frequency consistency control method for two-region flexible direct current interconnection system |
-
2015
- 2015-01-08 CN CN201510009328.4A patent/CN104600735A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039718A (en) * | 2017-11-17 | 2018-05-15 | 中国电力科学研究院有限公司 | A kind of improved flexible direct current voltage control method and system |
| CN108039718B (en) * | 2017-11-17 | 2023-09-22 | 中国电力科学研究院有限公司 | An improved flexible DC voltage control method and system |
| CN110086192A (en) * | 2019-03-22 | 2019-08-02 | 南方电网科学研究院有限责任公司 | Frequency consistency control method for two-region flexible direct current interconnection system |
| CN110086192B (en) * | 2019-03-22 | 2022-12-06 | 南方电网科学研究院有限责任公司 | Frequency consistency control method for two-region flexible direct current interconnection system |
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Application publication date: 20150506 |