CN106953357A - A kind of isolated network control method for frequency containing distributed power source at high proportion - Google Patents

A kind of isolated network control method for frequency containing distributed power source at high proportion Download PDF

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Publication number
CN106953357A
CN106953357A CN201710230322.9A CN201710230322A CN106953357A CN 106953357 A CN106953357 A CN 106953357A CN 201710230322 A CN201710230322 A CN 201710230322A CN 106953357 A CN106953357 A CN 106953357A
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frequency
control
voltage
inverter
power source
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CN106953357B (en
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袁敞
丁雨霏
谢佩琳
赵天扬
郝毅
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North China Electric Power University
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North China Electric Power University
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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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

A kind of isolated network control method for frequency containing distributed power source at high proportion, belongs to power converter technical field.On the premise of containing distributed power source at high proportion, by being controlled to inverter, realize when system load is mutated, return to normal range (NR) after system frequency brief fluctuations, realize the stable operation of whole system；It is widely used and isolated island microgrid frequency control field, and distributed power source capacity accounting gradually increases especially in microgrid, in the case that micro-grid system stability declines, realizes isolated island microgrid frequency stability contorting.Advantage is to return to stabilization after system frequency brief fluctuations, obtain good frequency modulation effect, realize the stable operation of whole system.

Description

A kind of isolated network control method for frequency containing distributed power source at high proportion
Technical field
The invention belongs to power converter technical field, more particularly, to a kind of isolated network frequency containing distributed power source at high proportion Control method.
Background technology
With the fast development of new energy, microgrid obtains the frequency stabilization pair of extensive concern and research, wherein microgrid Most important in the operation of piconet island mode stable, various isolated island microgrid control method for frequencies are by widely studied.With distribution Formula power supply capacity gradually increases, and traditional droop control fm capacity is more not enough.The present invention relates to one kind containing distributed at high proportion The isolated network control method for frequency of power supply, it is considered in the case that distributed power source capacity is larger, using proposed control structure, is realized Under piconet island operational mode, when load is undergone mutation, good frequency characteristics control, and stable operation is integrally presented in microgrid.
The content of the invention
It is an object of the invention to propose a kind of isolated network control method for frequency containing distributed power source at high proportion, using this Invention realizes that isolated network frequency stabilization is controlled.The frequency modulation system that the control system can make inverter simulate synchronous generator participates in adjusting Frequently.
The present invention is on the premise of containing distributed power source at high proportion, by being controlled to inverter, realizes when system is negative When carrying mutation, normal range (NR) is returned to after system frequency brief fluctuations, the stable operation of whole system is realized；It is widely used With isolated island microgrid frequency control field, distributed power source capacity accounting gradually increases especially in microgrid, micro-grid system stability In the case of decline, isolated island microgrid frequency stability contorting is realized.Processing step and the technical parameter controlled in process are as follows：
1) designing whole Isolated Network System includes two identical inverters and a synchronous generator, according to conventional isolated network electricity Grade is pressed, inverter rated capacity is set as 0.5MW, and DC voltage is 2.5kV, and AC load side rated voltage is 1kV；Pass System unit capacity is set to 1MW, and rated voltage is 1kV, so as to realize the Isolated Network System containing distributed power source at high proportion.
2) the distributed electrical source inventer in above-mentioned Isolated Network System is directed to, inverter control system is designed.Inverter is exported Control method for frequency simulates synchronous generator rotor inertia and system primary frequency modulation characteristic, and principle equation is as follows：
E=E0+(Qref-Qout)n (3)
Formula (1) is generator amature mechanical equation, and wherein H is inertia coeffeicent, KDFor damped coefficient, ω is mechanical angular frequency Rate, ωgridFor point of common coupling voltage angular frequency；Formula (2) is system primary frequency modulation governing equation, and m is active-frequency droop system Number；Formula (3) is system primary voltage governing equation, and n is the sagging coefficient of idle-voltage.
3) according to said frequencies control principle, by generator amature mechanical equation, system primary frequency modulation governing equation, system The design of primary voltage governing equation obtains control module, as shown in Figure 2.Power component, common point angular frequencypccWith reference angle Frequencies omegarefBetween deviation control to obtain power deviation formula (2) by active-frequency droop, be used as electromagnetism with reference power sum Power Pm, angular frequency is obtained using generator amature mechanical equation formula (1), system changeover angle θ is obtained to ω integrations；Idle portion Point, according to primary voltage governing equation (3), inverter exports idle Q with referring to idle QrefDifference it is sagging through idle-voltage Voltage deviation is controlled to obtain, system PCC point voltage magnitudes E is added0, produce reference voltage amplitude E.
4) the angle of transformation θ and reference voltage amplitude E of whole control system are obtained by above-mentioned control module, is generated using θ and E Reference voltage under the abc coordinate systems of double -loop control；
5) the input reference voltage V that dq conversion obtains double -loop control is carried out to the reference voltage under abc coordinate systemsdAnd Vq；It is double Ring control is using outer voltage, current inner loop control mode；
6) control that output waveform obtains inverter IGBT with 5kHz triangular waves through PWM makers after double -loop control is opened OFF signal, so as to control IGBT conducting and shut-off.
7) load is accessed after three units are in parallel, because only studying FREQUENCY CONTROL, thus resistive load is used.Incipient stage makes System is in steady operational status, and stable operation realizes that system frequency is fluctuated using sudden load change afterwards for a period of time.
8) after sudden load change, inverter and synchronous generator simultaneously participate in system frequency modulation.System is according to sagging coefficient ratio m1P1=m2P2=m3P3Carry out sharing of load, conventional rack and inverter issue additional corresponding active power respectively, conventional rack and The control system of inverter enters line frequency regulation, and stable operation is continued after finally realizing frequency stabilization, system brief fluctuations.
The beneficial effects of the present invention are, containing distributed power source at high proportion on the premise of, by being controlled to inverter, Realize that inverter and synchronous generator simultaneously participate in frequency modulation so that system frequency when system load mutation causes frequency fluctuation Stabilization is returned to after brief fluctuations, good frequency modulation effect is obtained, realizes the stable operation of whole system.
Brief description of the drawings
Fig. 1 is containing distributed power source Isolated Network System figure at high proportion.
Fig. 2 is control system primary method of control schematic diagram.
Fig. 3 is inverter structure and control block diagram.
Fig. 4 is system frequency control effect figure in the case of load changing.
Embodiment
The present invention is on the premise of containing distributed power source at high proportion, by being controlled to inverter, realizes when system is negative When carrying mutation, normal range (NR) is returned to after system frequency brief fluctuations, the stable operation of whole system is realized.
The present invention is elaborated with specific embodiment below in conjunction with the accompanying drawings.
1) designing whole Isolated Network System includes two identical inverters and a synchronous generator, according to conventional isolated network electricity Grade is pressed, inverter rated capacity is set as 0.5MW, and DC voltage is 2.5kV, and AC load side rated voltage is 1kV；Pass System unit capacity is set to 1MW, and rated voltage is 1kV, so as to realize the Isolated Network System containing distributed power source at high proportion, system knot Structure sketch is as shown in Figure 1.
2) the distributed electrical source inventer in above-mentioned Isolated Network System is directed to, inverter control system is designed.Inverter is exported Control method for frequency simulates synchronous generator rotor inertia and system primary frequency modulation characteristic, and principle equation is as follows：
E=E0+(Qref-Qout)n (3)
Formula (1) is generator amature mechanical equation, and wherein H is inertia coeffeicent, KDFor damped coefficient, ω is mechanical angular frequency Rate, ωgridFor point of common coupling voltage angular frequency；Formula (2) is system primary frequency modulation governing equation, and m is active-frequency droop system Number；Formula (3) is system primary voltage governing equation, and n is the sagging coefficient of idle-voltage.
3) according to said frequencies control principle, by generator amature mechanical equation, system primary frequency modulation governing equation, system It is as shown in Figure 1 that the design of primary voltage governing equation obtains control module.Power component, common point angular frequencypccWith referring to angular frequency Rate ωrefBetween deviation control to obtain power deviation (formula 2) by active-frequency droop, be used as electromagnetic work with reference power sum Rate Pm, angular frequency is obtained using generator amature mechanical equation (formula 1), system changeover angle θ is obtained to ω integrations；Idle portion Point, according to primary voltage governing equation (formula 3), inverter exports idle Q with referring to idle QrefDifference it is sagging through idle-voltage Voltage deviation is controlled to obtain, system PCC point voltage magnitudes E is added0, produce reference voltage amplitude E, specific control block diagram such as Fig. 2 institutes Show.
4) the angle of transformation θ and reference voltage amplitude E of whole control system are obtained by above-mentioned control module, is generated using θ and E Reference voltage under the abc coordinate systems of double -loop control；
5) the input reference voltage V that dq conversion obtains double -loop control is carried out to the reference voltage under abc coordinate systemsdAnd Vq；It is double Ring control is using outer voltage, current inner loop control mode；
6) control that output waveform obtains inverter IGBT with 5kHz triangular waves through PWM makers after double -loop control is opened OFF signal, so as to control IGBT conducting and shut-off.Specific control process is as shown in Figure 3.
System design parameter and running are as follows：
1) according to conventional isolated network voltage class, inverter capacity is set as 0.5MW, and load-side rated voltage is 1kV, inversion Device DC voltage is 2.5kV；Conventional rack capacity is set to 1MW, and rated voltage is 1kV, so as to realize that distributed power source holds Amount is at high proportion.
2) wave filter uses LC wave filters, is adjusted according to calculating and emulation experiment, finally takes parameter respectively L=10mH, R =0.0005 Ω, C=0.11 μ F, line impedance is respectively L1=1.5mH, R1=0.3852 Ω；L2=1.2mH, R2=0.2568 Ω；L3=0.8mH, R3=0.1926 Ω.
3) load is accessed after three units are in parallel, because only studying FREQUENCY CONTROL, thus resistive load is used.It is prominent using load Change realizes that system frequency is fluctuated, and load original steady-state is 1.2MW.
4) operation 10s afterloads sport 1.6MW.After sudden load change, inverter and synchronous generator simultaneously participate in system Frequency modulation, system is according to sagging coefficient ratio m1P1=m2P2=m3P3Sharing of load is carried out, conventional rack and inverter are issued additional respectively The control system of corresponding power, conventional rack and inverter enters line frequency regulation, finally realizes frequency stabilization, the of short duration ripple of system Continue stable operation after dynamic.
Fig. 4 show system frequency control effect figure in the case of load changing, as seen from the figure, when analogue system operation During to 10s, load is uprushed, and distributed power source participates in system frequency after system frequency modulation, 2.5s and recovers stable, and frequency fluctuation scope Requiring in the range of ± 0.2Hz, meeting and requiring, Isolated Network System can also recover stable operation again.Thus the control system It can realize that distributed power source participates in frequency modulation, and obtain good frequency modulation effect.
The foregoing is intended to be a preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims It is defined.

Claims (1)

1. a kind of isolated network control method for frequency containing distributed power source at high proportion, it is characterised in that processing step and in process The technical parameter of control is as follows：
1) designing whole Isolated Network System includes two identical inverters and a synchronous generator, according to isolated network voltage class, Inverter rated capacity is set as 0.5MW, and DC voltage is 2.5kV, and AC load side rated voltage is 1kV；Conventional rack Capacity is set to 1MW, and rated voltage is 1kV, so as to realize the Isolated Network System containing distributed power source at high proportion；
2) it is directed to step 1) distributed electrical source inventer in Isolated Network System, designs inverter control system；Inverter output frequency Rate control method simulates synchronous generator rotor inertia and system primary frequency modulation characteristic, and equation is as follows：
2 H d ω d t = P m - P o u t - K D ( ω - ω p c c ) - - - ( 1 )
P m - P r e f = 1 m ( ω r e f - ω p c c ) - - - ( 2 )
E=E0+(Qref-Qout)n (3)
Formula (1) is generator amature mechanical equation, and wherein H is inertia coeffeicent, KDFor damped coefficient, ω is mechanical angular frequency, ωgridFor point of common coupling voltage angular frequency；Formula (2) is system primary frequency modulation governing equation, and m is active-frequency droop coefficient； Formula (3) is system primary voltage governing equation, and n is the sagging coefficient of idle-voltage；
3) according to step 2) FREQUENCY CONTROL, it is once electric by generator amature mechanical equation, system primary frequency modulation governing equation, system Pressure governing equation design obtains control module；Power component, common point angular frequencypccWith referring to angular frequencyrefBetween it is inclined Difference controls to obtain power deviation formula (2) by active-frequency droop, and electromagnetic power P is used as with reference power summ, utilize generating Machine rotor mechanical equation formula (1) obtains angular frequency, and system changeover angle θ is obtained to ω integrations；Reactive component, according to primary voltage Governing equation (3), inverter exports idle Q with referring to idle QrefDifference obtain voltage deviation through idle-voltage droop control, Plus system PCC point voltage magnitudes E0, produce reference voltage amplitude E；
4) the angle of transformation θ and reference voltage amplitude E of whole control system are obtained by above-mentioned control module, it is bicyclic using θ and E generations Reference voltage under the abc coordinate systems of control；
5) the input reference voltage V that dq conversion obtains double -loop control is carried out to the reference voltage under abc coordinate systemsdAnd Vq；Bicyclic control System is using outer voltage, current inner loop control mode；
6) controlling switch that output waveform obtains inverter IGBT with 5kHz triangular waves through PWM makers after double -loop control is believed Number, control IGBT conducting and shut-off；
7) load is accessed after three units are in parallel, only research FREQUENCY CONTROL, using resistive load；It is steady that incipient stage is in system Determine running status, stable operation realizes that system frequency is fluctuated using sudden load change afterwards for a period of time；
8) after sudden load change, inverter and synchronous generator simultaneously participate in system frequency modulation；System is according to sagging coefficient ratio m1P1= m2P2=m3P3Sharing of load is carried out, conventional rack and inverter issue additional corresponding active power, conventional rack and inverter respectively Control system enter line frequency regulation, continue stable operation after finally realizing frequency stabilization, system brief fluctuations.
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CN107887927A (en) * 2017-11-13 2018-04-06 珠海格力电器股份有限公司 Micro-grid system and its control method, device
CN113162065A (en) * 2021-03-11 2021-07-23 国网山东省电力公司 Power grid frequency modulation method and system based on cooperative coordination between production loads
CN113765120A (en) * 2021-06-11 2021-12-07 中国电力科学研究院有限公司 Power grid frequency modulation method based on cooperative coordination of industrial park submerged arc furnace and polycrystalline silicon
CN114400640A (en) * 2022-01-17 2022-04-26 河海大学 Power grid distance protection method and device based on power supply constitution duty ratio online identification

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107887927A (en) * 2017-11-13 2018-04-06 珠海格力电器股份有限公司 Micro-grid system and its control method, device
CN113162065A (en) * 2021-03-11 2021-07-23 国网山东省电力公司 Power grid frequency modulation method and system based on cooperative coordination between production loads
CN113765120A (en) * 2021-06-11 2021-12-07 中国电力科学研究院有限公司 Power grid frequency modulation method based on cooperative coordination of industrial park submerged arc furnace and polycrystalline silicon
CN114400640A (en) * 2022-01-17 2022-04-26 河海大学 Power grid distance protection method and device based on power supply constitution duty ratio online identification
CN114400640B (en) * 2022-01-17 2022-09-30 河海大学 Power grid distance protection method and device based on power supply constitution proportion online identification

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