CN105552946B - Direct-current voltage control method and system of flexible ring network controller - Google Patents
Direct-current voltage control method and system of flexible ring network controller Download PDFInfo
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- CN105552946B CN105552946B CN201511024959.XA CN201511024959A CN105552946B CN 105552946 B CN105552946 B CN 105552946B CN 201511024959 A CN201511024959 A CN 201511024959A CN 105552946 B CN105552946 B CN 105552946B
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- 238000004891 communication Methods 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
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- 230000010355 oscillation Effects 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
The invention relates to an active power control method and a control system of a flexible ring network controller, comprising the following steps: generating a DC voltage reference value U at a constant DC voltage control sidedcref(ii) a Reference value U of DC voltagedcrefAfter passing through a PI link of a direct current voltage controller, generating an active current reference value idref_opp(ii) a Reference value id of active currentref_oppThe communication optical fiber is transmitted to a converter station at the fixed active power side; reference signal P for generating active power of converter station on fixed active power control sideref(ii) a Receiving an active current reference value id by a fixed active power side converter stationref_oppTransmitting it to the active power controller as an additional control signal; generating positive sequence d-axis current reference value i by using fixed active power side converter stationd*. The technical scheme provided by the invention utilizes inter-station communication to generate an additional signal of an active power controller of a fixed power control side converter station from a direct-current voltage signal of the fixed direct-current voltage side converter station, and realizes the rapid regulation of the active power transmitted by the flexible ring network controller through the coordination control of the two end converter stations.
Description
Technical Field
The invention relates to a control strategy of a flexible ring network controller, in particular to a direct-current voltage control method and a direct-current voltage control system of the flexible ring network controller.
Background
The flexible ring network controller is back-to-back flexible direct current, the control system structure is symmetrical, and the commonly used outer ring controller has the following forms: constant direct current voltage control, constant active power control, constant reactive power control, constant alternating current voltage control and the like. The constant dc voltage control is very important, and for the flexible ring network controller system, one end of the flexible ring network controller system must adopt the constant dc voltage control for balancing the active power of the flexible ring network controller system and maintaining the dc side voltage stable. When the active power of the alternating current systems on the two sides connected with the flexible ring network controller is unbalanced, the fluctuation of the direct current voltage is caused, and at the moment, the active current charges (or discharges) the capacitor on the direct current side until the direct current voltage is stabilized at a set value. Therefore, the constant dc voltage controlled converter station acts as an active balancing node. In the designed constant direct current voltage controller, direct current voltage and direct current voltage command deviation are used as reference of active current after being subjected to PI regulation, and then direct current voltage of the flexible ring network controller is regulated.
When the flexible ring network controller is required to boost or drop the direct-current voltage in a short time due to the change of the operation working condition, when the command value of the direct-current voltage changes suddenly, the original control strategy only depends on the converter station at the fixed direct-current voltage side to adjust the direct-current voltage, and the change response of the direct-current voltage has certain time delay and has disadvantages.
Disclosure of Invention
In order to solve the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a method for controlling a dc voltage of a flexible ring network controller and a control system thereof.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a direct current voltage control method of a flexible ring network controller, which is improved in that the method comprises the following steps:
step (1): generating a DC voltage reference value U at a constant DC voltage control sidedcref；
Step (2): reference value U of DC voltagedcrefAfter passing through a PI link of a direct current voltage controller, generating an active current reference value idref_opp；
And (3): reference value id of active currentref_oppThe communication optical fiber is transmitted to a converter station at the fixed active power side;
and (4): reference signal P for generating active power of converter station on fixed active power control sideref；
And (5): receiving an active current reference value id by a fixed active power side converter stationref_oppTransmitting it to the active power controller as an additional control signal;
and (6): generating positive sequence d-axis active current reference value i by using fixed active power side converter stationd*。
Further, in the step (1), the dc voltage control module of the fixed dc voltage side converter station receives the upper dc voltage command value UdcsetGenerating a DC voltage reference value U according to the system running state through a DC voltage regulation linkdcref(ii) a Different direct current voltage regulation links and upper and lower limit values are designed according to requirements.
Further, in the step (2), a converter in a constant direct current voltage control mode is used for balancing active power of the direct current system and keeping voltage on the direct current side stable; when neglecting R and converter loss, the active power on both sides of the converter AC and DC is kept balanced, i.e.
At steady state:
wherein: p is active power of AC system, Us、isdRespectively, AC voltage and active current, Pdc、udc、idcRespectively direct voltage, direct current and direct active power, iLDirect current at steady state;
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and the DC voltage command deviation are used as the reference value of the active current after being regulated by PI
Further, in the step (3), the active current reference value id is obtained by utilizing inter-station communicationref_oppAnd the communication optical fiber is used for transmitting the signals from the converter station at the fixed direct voltage side to the converter station at the opposite side, namely the converter station at the fixed active power side.
Further, in the step (4), the active power controller of the converter station at the fixed active power control side receives the active scheduling command PsetGenerating a reference signal P of active power through an active command regulation linkref；
The Active scheduling instruction Pset and the modulation Active signal Pm for restraining low-frequency oscillation and realizing the emergency Power support purpose generate a Reference signal Pref of Active Power through an Active Power instruction Regulation link (Active Power Reference Regulation), and different Active instruction Regulation links and upper and lower limit values can be designed according to requirements.
Further, in the step (6), the reference signal P of active powerrefGenerating an active current reference value and an additional control signal id through an active power controllerref_oppAdding the two values, and generating a positive sequence d-axis active current reference value i of the converter station at the fixed active power side through an amplitude limiting link and a conversion linkd*；
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value i is generatedsd *_opp，
Wherein: p is active power of AC system, Us、isdRespectively alternating voltage and active current.
The control system of the direct-current voltage control method of a flexible ring network controller is improved in that the control system comprises a fixed active power side converter station and a fixed direct-current voltage side converter station which are communicated in sequence;
the converter station at the fixed active power control side comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value isd * _opp；
The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the invention provides a control strategy for quickly adjusting direct current voltage by introducing the semaphore of a converter station at a fixed direct current voltage side as an additional signal into an active power controller based on communication, which has the following remarkable effects:
1. the method adopts communication to generate the direct-current voltage signal of the converter station at the fixed direct-current voltage side into the additional signal of the active power controller of the converter station at the fixed power control side, and simulation results show that the change time of direct-current voltage can be reduced by at least about 190ms, the control response speed is rapid, and the effect is obvious.
2. The method distributes the task of controlling the direct-current voltage to the two converter stations, and the traditional single converter station is changed into the two converter stations, so that the control flexibility is improved, the stable operation capability of the system is enhanced, and the economy and the safety are improved.
Drawings
FIG. 1 shows an additional signal P at a side of a fixed DC voltage based on communication introduction provided by the present inventionref_oppActive power controller logic diagram of (1);
fig. 2 is a diagram of a simulation result of the dc voltage fast adjustment control provided by the present invention, wherein: (a) a direct current voltage command value; (b) the direct-current voltage is quickly adjusted and controlled;
fig. 3 is a flowchart of an active power control method of a flexible ring network controller provided in the present invention;
FIG. 4 is a diagram of a DC reference value U generated by a converter station at a fixed DC voltage side according to the present inventiondcrefA logic diagram of (a);
FIG. 5 shows the DC voltage and the DC voltage command deviation as the reference value of the active current after PI regulation
A logic diagram of (a);
FIG. 6 is a logic diagram of the reference signal Pref for generating active power provided by the present invention;
FIG. 7 shows the generation of the active current reference value i provided by the present inventionsd *OPP.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The flexible ring network controller is formed by connecting two voltage source converters to an alternating current power grid transmission line in a back-to-back mode, and functions of electromagnetic ring network disconnection, fault isolation, reactive support and the like are achieved through independent control over active power and reactive power of an alternating current system.
In order to enable a flexible ring network controller to more quickly adjust a direct-current voltage, the invention provides a method for introducing an intermediate control quantity generated by a fixed direct-current voltage side converter station into an active power controller of the fixed active side converter station as an additional signal based on inter-station communication to realize quick adjustment control of the direct-current voltage, wherein a flow chart of the method is shown in fig. 3 and specifically comprises the following steps:
step (1): the DC voltage control module at the constant DC voltage control side receives the upper DC voltage command value and adjusts the DC voltage regulation loopGenerating a DC voltage reference value U according to the system running statedcref(ii) a A direct-current voltage control module of the fixed direct-current voltage side converter station receives a superior direct-current voltage scheduling command Udcset, and generates a direct-current voltage reference signal Udcref through a direct-current voltage regulation link; different direct current voltage regulation links and upper and lower limit values are designed according to requirements. Generating DC voltage reference value U by fixed DC voltage side converter stationdcrefIs shown in fig. 4.
Step (2): u in step (1)dcrefGenerating an active current reference value idref _ opp after passing through a PI link of a direct current voltage controller; a current converter adopting a constant direct-current voltage control mode is used for balancing the active power of a direct-current system and keeping the voltage of a direct-current side stable; when neglecting R and converter loss, the active power on both sides of the converter AC and DC is kept balanced, i.e.
At steady state:
wherein: p is active power of AC system, Us、isdRespectively, AC voltage and active current, Pdc、udc、idcRespectively direct voltage, direct current and direct active power, iLDirect current at steady state;
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and the DC voltage command deviation are used as the reference value of the active current after being regulated by PI
DC voltage and DC voltage command deviationThe reference value is used as the reference value of active current after PI regulation
Is shown in fig. 5.
And (3): using inter-station communication to convert the id of step (2)ref_oppThe communication optical fiber is used for transmitting the direct current voltage from the converter station at the fixed direct current voltage side to the converter station at the opposite side, namely the converter station at the fixed active power side;
and (4): an active power controller of a converter station at the fixed active power control side receives an active scheduling instruction PsetGenerating a reference signal P of active power through an active command regulation linkref(ii) a The Active scheduling instruction Pset and the modulation Active signal Pm for restraining low-frequency oscillation and realizing the emergency power support purpose generate a reference signal Pref of Active power through an Active instruction regulation link (Active Power Reference Regulation), and different Active instruction regulation links and upper and lower limit values can be designed according to requirements. The logic diagram of the reference signal Pref generating the active power is shown in fig. 6.
And (5): receiving id of converter station at fixed active power sideref_oppTransmitting it to the active power controller as an additional control signal; a logic diagram of an active power controller based on the communication of the incoming fixed dc voltage side additional signal idref _ opp is shown in fig. 1.
And (6): reference signal P of active power in step (4)refGenerating an active current reference value through the active power controller, and comparing the active current reference value with the additional control signal id in the step (5)ref_oppAdding the two values, and generating a positive sequence d-axis active current reference value i of the converter station at the fixed active power side through an amplitude limiting link and a conversion linkd*；
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value i is generatedsd *_opp，
Wherein: p is active power of AC system, Us、isdRespectively alternating voltage and active current.
Fig. 2 shows a simulation result diagram of the dc voltage fast adjustment control, where: (a) a direct current voltage command value; (b) the direct current voltage quickly adjusts and controls the effect. Generating an active current reference value isd *The logic diagram for _ opp is shown in FIG. 7.
The invention also provides a control system of the direct-current voltage control method of the flexible ring network controller, which comprises a fixed active power side converter station and a fixed direct-current voltage side converter station which are communicated in sequence;
the fixed active power control side converter station comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value isd * _opp(ii) a The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
The invention transfers the intermediate control quantity generated by the direct-current voltage controller of the fixed direct-current voltage side converter station to the fixed power side converter station by means of inter-station communication, and the intermediate control quantity is introduced as an additional control signal of the active power controller, so that when the direct-current voltage command value changes, the active power can be quickly adjusted to the opposite side converter station to be matched with the change of the direct-current voltage, coordination control is realized, and the actual direct-current voltage is quickly changed.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (6)
1. A method for controlling dc voltage of a flexible ring network controller, the method comprising:
step (1): generating a DC voltage reference value U at a constant DC voltage control sidedcref；
Step (2): reference value U of DC voltagedcrefAfter passing through a PI link of a direct current voltage controller, generating an active current reference value idref_opp；
And (3): reference value id of active currentref_oppThe communication optical fiber is transmitted to a converter station at the fixed active power side;
and (4): reference signal P for generating active power of converter station on fixed active power control sideref；
And (5): receiving an active current reference value id by a fixed active power side converter stationref_oppTransmitting it to the active power controller as an additional control signal;
and (6): generating positive sequence d-axis active current reference value i by using fixed active power side converter stationd*。
2. The direct-current voltage control method according to claim 1, wherein in the step (1), the direct-current voltage control module of the fixed direct-current voltage side converter station receives an upper direct-current voltage command value UdcsetGenerating a DC voltage reference value U according to the system running state through a DC voltage regulation linkdcref(ii) a Different direct current voltage regulation links and upper and lower limit values are designed according to requirements.
3. The dc voltage control method according to claim 1, wherein in the step (2), the inverter with a constant dc voltage control mode is used for balancing the active power of the dc system and keeping the dc-side voltage stable; when neglecting R and transverter loss, the active power of transverter alternating current-direct current both sides keeps balanced, promptly:
at steady state:
wherein: p is active power of AC system, Us、isdRespectively, AC voltage and active current, Pdc、udc、idcRespectively direct voltage, direct current and direct active power, iLDirect current at steady state;
when active power on the AC side and the DC side of the VSC is unbalanced, the fluctuation of DC voltage is caused, and at the moment, the active current charges or discharges a capacitor on the DC side until the DC voltage is stabilized at a set value; for a converter controlled by constant direct current voltage, the converter is equivalent to an active balance node; in the designed constant DC voltage controller, the DC voltage and the DC voltage command deviation are used as the reference value of the active current after being regulated by PI
4. The dc voltage control method according to claim 1, wherein in the step (4), the active power controller of the fixed active power control side converter station receives an active scheduling command PsetGenerating a reference signal P of active power through an active command regulation linkref；
The active power control method comprises the steps of active scheduling instruction Pset, modulating an active signal Pm for restraining low-frequency oscillation and achieving emergency power support, generating a reference signal Pref of active power through an active instruction adjusting link, and designing different active instruction adjusting links and upper and lower limit values according to needs.
5. The direct voltage control method according to claim 1, wherein in the step (6), there is active powerReference signal P of powerrefGenerating an active current reference value and an additional control signal id through an active power controllerref_oppAdding the two values, and generating a positive sequence d-axis active current reference value i of the converter station at the fixed active power side through an amplitude limiting link and a conversion linkd*；
Under the condition of three-phase power grid voltage balance, the direction of a power grid voltage vector Us is a d-axis direction, an outer-loop active power controller is designed, and an active current reference value is generated
Wherein: p is active power of AC system, Us、isdRespectively alternating voltage and active current.
6. A control system of a DC voltage control method of a flexible ring network controller according to any of claims 1-5, characterized in that the control system comprises a fixed active power side converter station and a fixed DC voltage side converter station which communicate in sequence;
the converter station at the fixed active power control side comprises an active power control module and an outer ring active power controller module which are communicated in sequence; the active power control module is used for receiving a superior active power instruction value PsetThe active power reference value generation module is used for generating an active power reference value Pref(ii) a The outer loop active power controller module is based on the active power reference value PrefGenerating an active current reference value
The fixed direct-current voltage side converter station comprises a direct-current voltage control module; the direct-current voltage control module is used for receiving a superior direct-current voltage scheduling instruction Udcset(ii) a And generates a reference signal U of a direct current voltagedcref。
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| CN105932706B (en) * | 2016-05-31 | 2018-07-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of control method for coordinating for improving mixing back-to-back DC system |
| CN106058842A (en) * | 2016-07-25 | 2016-10-26 | 国家电网公司 | DC power grid voltage control method |
| CN106685222B (en) * | 2017-01-06 | 2019-06-21 | 许继电气股份有限公司 | A kind of DC/DC converter and DC/DC converter internal direct current busbar voltage balance control method |
| CN107612013B (en) * | 2017-09-13 | 2020-07-28 | 南京南瑞继保电气有限公司 | Direct-current power grid voltage range control method |
| CN108039718B (en) * | 2017-11-17 | 2023-09-22 | 中国电力科学研究院有限公司 | Improved flexible direct-current voltage control method and system |
| CN109818376B (en) * | 2017-11-20 | 2022-07-22 | 国网江苏省电力公司徐州供电公司 | Active power control method for power supply system of flexible distribution network |
| CN112018801B (en) * | 2020-08-06 | 2022-01-21 | 江苏省电力试验研究院有限公司 | Receiving-end cascade hybrid direct current coordination control method based on dynamic amplitude limiting |
| CN114629126B (en) * | 2022-04-18 | 2024-04-26 | 广东电网有限责任公司电力调度控制中心 | Control method and system for two-area system through alternating current and multi-circuit direct current interconnection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0554804A1 (en) * | 1992-01-30 | 1993-08-11 | Hitachi, Ltd. | Control equipment for high voltage direct current transmission system |
| JP2002112533A (en) * | 2000-09-29 | 2002-04-12 | Meiji Natl Ind Co Ltd | Constant-power control device |
| CN102354969A (en) * | 2011-09-26 | 2012-02-15 | 中国电力科学研究院 | Control device for flexible direct current (DC) transmission system of modular multilevel converter (MMC) |
| CN104269861A (en) * | 2014-10-13 | 2015-01-07 | 国家电网公司 | Electromagnetic looped network reactive power ring current optimal control method based on flexible looped network controller |
-
2015
- 2015-12-30 CN CN201511024959.XA patent/CN105552946B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0554804A1 (en) * | 1992-01-30 | 1993-08-11 | Hitachi, Ltd. | Control equipment for high voltage direct current transmission system |
| JP2002112533A (en) * | 2000-09-29 | 2002-04-12 | Meiji Natl Ind Co Ltd | Constant-power control device |
| CN102354969A (en) * | 2011-09-26 | 2012-02-15 | 中国电力科学研究院 | Control device for flexible direct current (DC) transmission system of modular multilevel converter (MMC) |
| CN104269861A (en) * | 2014-10-13 | 2015-01-07 | 国家电网公司 | Electromagnetic looped network reactive power ring current optimal control method based on flexible looped network controller |
Non-Patent Citations (1)
| Title |
|---|
| 用于ＶＳＣ－ＨＶＤＣ互联***的附加频率控制策略;朱瑞可等;《电力***自动化》;20140825;第38卷(第16期);第81-87页 * |
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