CN110492520B - DC voltage slope control strategy based on converter capacity and regulation speed - Google Patents
DC voltage slope control strategy based on converter capacity and regulation speed Download PDFInfo
- Publication number
- CN110492520B CN110492520B CN201910775890.6A CN201910775890A CN110492520B CN 110492520 B CN110492520 B CN 110492520B CN 201910775890 A CN201910775890 A CN 201910775890A CN 110492520 B CN110492520 B CN 110492520B
- Authority
- CN
- China
- Prior art keywords
- direct
- current voltage
- power
- capacity
- converter station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000011217 control strategy Methods 0.000 title claims abstract description 17
- 230000033228 biological regulation Effects 0.000 title claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000012937 correction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a direct-current voltage slope control strategy based on converter capacity and regulation speed, which overcomes the defect that a converter station with smaller power margin easily enters a full-load state when power fluctuation occurs in the direct-current voltage fixed slope control strategy of a multi-terminal flexible direct-current power transmission system, so that the response capability to the current change of a direct-current network is lost. The invention corrects the fixed slope coefficient of the multi-terminal flexible direct current transmission direct current voltage, does not need communication among converter stations, ensures that the converter stations with smaller power margin share less unbalanced power, ensures that the converter stations with larger power margin bear more unbalanced power, and avoids the situation that the converter stations with smaller power margin are switched into a fixed power mode due to full load caused by power fluctuation, thereby being a direct current voltage self-adaptive slope control strategy based on converter capacity and adjusting speed. The multiple converter stations of the multi-terminal flexible direct current transmission system have power flow regulation capability and capability of quickly stabilizing direct current network power in transient state.
Description
Technical Field
The invention relates to a multi-terminal flexible direct current transmission multi-point direct current voltage control strategy which is suitable for a multi-terminal flexible direct current transmission system.
Background
Along with the development of the flexible direct current transmission technology, related theoretical research is continuously perfected, equipment manufacturing technology is continuously improved, capacity is improved, voltage class is continuously extended, and flexible direct current transmission is widely applied to various fields from a power distribution network, a high-voltage power network, an ultra-high voltage power network to an ultra-high voltage power network. The flexible direct current transmission takes a voltage source converter of a fully-controlled semiconductor material insulated gate bipolar transistor (Insulated Gate Bipolar Transistor IGBT) as a main body, and is becoming a research focus of domestic and foreign power planning units, scientific research institutes and manufacturing units. Compared with the traditional power transmission mode, the high-voltage direct current power transmission based on the voltage source converter has the advantages of rapid independent control of active power and reactive power, certain dynamic reactive compensation capability, improvement of power quality, power supply to a passive network, easy realization of power flow overturning, construction of a multi-terminal flexible direct current power transmission system (Voltage source converter based Multi-terminal HVDC, VSC-MTDC), great increase of the transmission capacity of the same power transmission corridor and the like.
In a multi-terminal flexible DC power transmission system, a converter station at one end is required to adopt fixed DCThe current voltage control is called a main converter station, mainly plays a role in stabilizing the power of a system and balancing the power of the system, and when unbalanced power occurs in the system, the main station performs power balance adjustment; if the dominant converter station loses the control capability of the direct current voltage, the power flow of the whole flexible direct current transmission system is unstable, so that the reliability of a single-point direct current voltage control strategy is poor; for multipoint direct-current voltage control, namely, a plurality of converter stations in a direct-current power transmission system have direct-current voltage control capability, the multipoint direct-current voltage control is divided into master-slave control and direct-current voltage deviation control according to whether communication equipment between the converter stations is required or not; the master-slave control is a control mode requiring communication between converter stations, and realizes the stabilization of direct-current voltage by using a communication system between the converter stations; the direct-current voltage deviation control is a control mode without communication among converter stations, namely, after the fixed direct-current station fails and exits from operation, the backup fixed direct-current voltage station can detect larger deviation of the direct-current voltage and transfer the larger deviation into the fixed direct-current voltage operation simulation to ensure the stability of the direct-current voltage; the dc voltage slope control is a dc voltage control system which has been attracting attention in recent years, and a multi-terminal flexible dc power transmission system using a dc voltage slope controller has independent dc power and dc voltage P at each converter station dc -U dc And the relation curve distributes the task of stabilizing the direct current voltage to a plurality of converter stations, so that the converter stations operating under the strategy search new operating points along the respective independent slope characteristic curves to realize the rapid balance and distribution of the direct current power, but the control strategy does not consider the actual operating conditions of the converter stations, and for the converter stations with small power margin, if the fluctuating power quantity is born according to a fixed slope, the converter stations can be fully loaded, thereby switching into constant power operation and losing the capability of responding to the change of the direct current network power flow.
Disclosure of Invention
The invention provides a direct-current voltage slope control strategy based on converter capacity and regulation speed, which overcomes the defect that a converter station with smaller power margin easily enters a full-load state when power fluctuation occurs in the direct-current voltage fixed slope control strategy of a multi-terminal flexible direct-current power transmission system, so that the response capability to the current change of a direct-current network is lost.
The invention solves the technical problems by the following technical proposal:
the general conception of the invention is that: the invention corrects the fixed slope coefficient of the multi-terminal flexible direct current transmission direct current voltage, does not need communication among converter stations, ensures that the converter stations with smaller power margin share less unbalanced power, ensures that the converter stations with larger power margin bear more unbalanced power, and avoids the situation that the converter stations with smaller power margin are switched into a fixed power mode due to full load caused by power fluctuation, thereby being a direct current voltage self-adaptive slope control strategy based on converter capacity and adjusting speed.
A direct-current voltage slope control strategy based on converter capacity and regulation speed is based on a direct-current voltage self-adaptive slope control end converter station in a four-terminal flexible direct-current power transmission system, and comprises the following steps:
the method comprises the steps of firstly, obtaining rated capacity S of a certain direct-current voltage self-adaptive slope control end converter station;
step two, obtaining a direct-current voltage fixed slope coefficient K of a direct-current voltage self-adaptive slope control end converter station;
step three, when the power of the converter station at a certain direct-current voltage self-adaptive slope control end is 0, the capacity margin of the converter station is 100%; when the power of a converter station at a certain direct-current voltage self-adaptive slope control end is rated power, the capacity margin of the converter station is 0%, and the capacity margin is divided into ten equal parts eta 1 、η 2 …η 10 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the adjusting speed v corresponding to ten capacity margins 1 、v 2 …v 10 ；
Fourth step, capacity margin eta based on ten equal parts 1 、η 2 …η 10 Adjustment speed v corresponding to ten capacity margins obtained 1 、v 2 …v 10 Fitting a capacity margin function curve f (eta);
fifthly, obtaining the actual running power P of a certain direct-current voltage self-adaptive slope control end converter station;
according to the publicThe formula:
calculating capacity margin eta of converter station p ；
Sixth step, capacity margin eta p Is carried into a capacity margin function curve f (eta) to obtain a capacity margin eta p Capacity margin function curve f (eta) p ) And uses the formula: k (K) * ＝f(η p ) XK, correcting the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station obtained in the second step to obtain a corrected value K of the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station * And a minimum correction value K of K *min And maximum correction value K of K *max And thus constitutes a DC voltage adaptive slope controller.
The direct-current voltage fixed slope control slope value K of a direct-current voltage self-adaptive slope control end converter station is calculated according to the following formula:
wherein: in order to ensure that the direct-current voltage slope curve is within the limit value of voltage fluctuation, 0 < beta is less than or equal to 1, wherein beta=0.75 is taken;
U dcmax is the maximum allowable value of the direct current voltage;
U dcref controlling a reference value for the direct current voltage;
s is the rated capacity of a converter station at a certain direct-current voltage self-adaptive slope control end.
The invention utilizes the direct-current voltage self-adaptive slope control strategy to enable a plurality of converter stations of the multi-terminal flexible direct-current transmission system to have power flow regulation capability and capability of quickly stabilizing direct-current network power in transient state.
Drawings
FIG. 1 is a flow chart of a DC voltage adaptive slope control strategy of the present invention;
FIG. 2 shows the present inventionFour-terminal direct current transmission system adopted by explicit control strategy, wherein S 1 、S 2 The two ends of the structure diagram are operated in the direct-current voltage self-adaptive slope control;
FIG. 3 is a schematic diagram of a DC voltage adaptive slope controller according to the present invention;
FIG. 4 is a simulation diagram of steady state simulation 1 in an embodiment of the present invention;
FIG. 5 is a simulation diagram of steady state simulation 2 in an embodiment of the present invention;
FIG. 6 is a simulation diagram of steady state simulation 3 in an embodiment of the present invention;
fig. 7 is a simulation diagram of a dc side fault in an embodiment of the present invention.
Detailed Description
A direct-current voltage slope control strategy based on converter capacity and regulation speed is based on a direct-current voltage self-adaptive slope control end converter station in a four-terminal flexible direct-current power transmission system, and comprises the following steps:
the method comprises the steps of firstly, obtaining rated capacity S of a certain direct-current voltage self-adaptive slope control end converter station;
step two, obtaining a direct-current voltage fixed slope coefficient K of a direct-current voltage self-adaptive slope control end converter station;
step three, when the power of the converter station at a certain direct-current voltage self-adaptive slope control end is 0, the capacity margin of the converter station is 100%; when the power of a converter station at a certain direct-current voltage self-adaptive slope control end is rated power, the capacity margin of the converter station is 0%, and the capacity margin is divided into ten equal parts eta 1 、η 2 …η 10 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the adjusting speed v corresponding to ten capacity margins 1 、v 2 …v 10 ；
Fourth step, capacity margin eta based on ten equal parts 1 、η 2 …η 10 Adjustment speed v corresponding to ten capacity margins obtained 1 、v 2 …v 10 Fitting a capacity margin function curve f (eta);
fifthly, obtaining the actual running power P of a certain direct-current voltage self-adaptive slope control end converter station;
according to the formula:
calculating capacity margin eta of converter station p ；
Sixth step, capacity margin eta p Is carried into a capacity margin function curve f (eta) to obtain a capacity margin eta p Capacity margin function curve f (eta) p ) And uses the formula: k (K) * ＝f(η p ) XK, correcting the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station obtained in the second step to obtain a corrected value K of the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station * And a minimum correction value K of K *min And maximum correction value K of K *max And thus constitutes a DC voltage adaptive slope controller.
The direct-current voltage fixed slope control slope value K of a direct-current voltage self-adaptive slope control end converter station is calculated according to the following formula:
wherein: in order to ensure that the direct-current voltage slope curve is within the limit value of voltage fluctuation, 0 < beta is less than or equal to 1, wherein beta=0.75 is taken;
U dcmax is the maximum allowable value of the direct current voltage;
U dcref controlling a reference value for the direct current voltage;
s is the rated capacity of a converter station at a certain direct-current voltage self-adaptive slope control end.
The four-terminal flexible direct current transmission simulation system basic parameter table comprises the following components:
the invention relates to a calculation parameter table of a direct current voltage fixed slope control slope value K of a convertor station:
| maximum fluctuation value of direct current power supply | β |
| ±7.5％ | 0.75 |
；
The invention fits a curve parameter table based on capacity margin and adjusting speed:
| power margin η/% | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 |
| Adjusting the speed v | 10 | 10 | 5 | 2.5 | 2 | 1.667 | 1.25 | 1 | 1 |
；
The fitted functional relationship is: f (η) = 0.2922 η 2 -1.4422η+1.1619。
The drawings that are needed in the description of the embodiments or prior art are briefly introduced above, and it is obvious that the drawings in the description are only embodiments of the present invention, and that other drawings can be obtained without inventive effort by a person skilled in the art according to the provided drawings without inventive effort.
Claims (1)
1. A direct-current voltage slope control strategy based on converter capacity and regulation speed is based on a direct-current voltage self-adaptive slope control end converter station in a four-terminal flexible direct-current power transmission system, and comprises the following steps:
the method comprises the steps of firstly, obtaining rated capacity S of a certain direct-current voltage self-adaptive slope control end converter station;
step two, obtaining a direct-current voltage fixed slope coefficient K of a direct-current voltage self-adaptive slope control end converter station; the calculation method of the K value is as follows:
wherein: in order to ensure that the direct-current voltage slope curve is within the limit value of voltage fluctuation, 0 < beta is less than or equal to 1, wherein beta=0.75 is taken;
U dcmax is the maximum allowable value of the direct current voltage;
U dcref controlling a reference value for the direct current voltage;
s is the rated capacity of a converter station at a certain direct-current voltage self-adaptive slope control end;
step three, when the power of the converter station at a certain direct-current voltage self-adaptive slope control end is 0, the capacity margin of the converter station is 100%; when the power of a converter station at a certain direct-current voltage self-adaptive slope control end is rated power, the capacity margin of the converter station is 0%, and the capacity margin is divided into ten equal parts eta 1 、η 2 …η 10 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the adjusting speed v corresponding to ten capacity margins 1 、v 2 …v 10 ；
Fourth step, capacity margin eta based on ten equal parts 1 、η 2 …η 10 Adjustment speed v corresponding to ten capacity margins obtained 1 、v 2 …v 10 Fitting a capacity margin function curve f (eta);
fifthly, obtaining the actual running power P of a certain direct-current voltage self-adaptive slope control end converter station; according to the formula:
calculating capacity margin eta of converter station p ；
Sixth step, capacity margin eta p Is carried into a capacity margin function curve f (eta) to obtain a capacity margin eta p Capacity margin function curve f (eta) p ) And uses the formula: k (K) * ＝f(η p ) XK, correcting the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station obtained in the second step to obtain a corrected value K of the direct-current voltage fixed slope coefficient K of the direct-current voltage self-adaptive slope control end converter station * And a minimum correction value of K
And maximum correction value of K->
And thus constitutes a DC voltage adaptive slope controller. />
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775890.6A CN110492520B (en) | 2019-08-21 | 2019-08-21 | DC voltage slope control strategy based on converter capacity and regulation speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775890.6A CN110492520B (en) | 2019-08-21 | 2019-08-21 | DC voltage slope control strategy based on converter capacity and regulation speed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110492520A CN110492520A (en) | 2019-11-22 |
| CN110492520B true CN110492520B (en) | 2023-05-26 |
Family
ID=68552659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910775890.6A Active CN110492520B (en) | 2019-08-21 | 2019-08-21 | DC voltage slope control strategy based on converter capacity and regulation speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110492520B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371115B (en) * | 2020-04-02 | 2021-07-13 | 清华大学 | Load margin evaluation method and system for alternating current-direct current series-parallel power system |
| CN112542850B (en) * | 2020-11-27 | 2022-06-28 | 清华四川能源互联网研究院 | Active power balance-based multi-terminal direct-current distribution network voltage difference-free control method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022522A (en) * | 2014-06-09 | 2014-09-03 | 山东大学 | Method for cooperatively controlling multiport flexible DC power transmission system |
| CN104901301A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Coordination control method for multi-terminal flexible DC power transmission system |
| CN105896517A (en) * | 2014-12-31 | 2016-08-24 | 国家电网公司 | Voltage droop control method of DC power grid |
| WO2017198724A1 (en) * | 2016-05-20 | 2017-11-23 | General Electric Technology Gmbh | Control of voltage source converters |
| CN108923448A (en) * | 2018-06-19 | 2018-11-30 | 东南大学 | A kind of Multi-end flexible direct current transmission control method for coordinating and system |
| CN109120005A (en) * | 2018-06-22 | 2019-01-01 | 华北电力大学（保定） | A kind of Multi-end flexible direct current transmission system power coordination control method |
| CN109274113A (en) * | 2018-09-06 | 2019-01-25 | 华北电力大学（保定） | A kind of Polynuclear complex mission nonlinear droop control method |
| CN110086193A (en) * | 2019-05-21 | 2019-08-02 | 上海电力学院 | Adaptive droop control method suitable for flexible direct current distribution system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2485378A1 (en) * | 2011-02-08 | 2012-08-08 | Converteam Technology Ltd | Control arrangement and method for regulating the output voltage of a dc source power converter connected to a multi-source dc system |
| JP6390535B2 (en) * | 2015-06-26 | 2018-09-19 | 株式会社デンソー | Power conversion control device |
-
2019
- 2019-08-21 CN CN201910775890.6A patent/CN110492520B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901301A (en) * | 2014-03-04 | 2015-09-09 | 国家电网公司 | Coordination control method for multi-terminal flexible DC power transmission system |
| CN104022522A (en) * | 2014-06-09 | 2014-09-03 | 山东大学 | Method for cooperatively controlling multiport flexible DC power transmission system |
| CN105896517A (en) * | 2014-12-31 | 2016-08-24 | 国家电网公司 | Voltage droop control method of DC power grid |
| WO2017198724A1 (en) * | 2016-05-20 | 2017-11-23 | General Electric Technology Gmbh | Control of voltage source converters |
| CN108923448A (en) * | 2018-06-19 | 2018-11-30 | 东南大学 | A kind of Multi-end flexible direct current transmission control method for coordinating and system |
| CN109120005A (en) * | 2018-06-22 | 2019-01-01 | 华北电力大学（保定） | A kind of Multi-end flexible direct current transmission system power coordination control method |
| CN109274113A (en) * | 2018-09-06 | 2019-01-25 | 华北电力大学（保定） | A kind of Polynuclear complex mission nonlinear droop control method |
| CN110086193A (en) * | 2019-05-21 | 2019-08-02 | 上海电力学院 | Adaptive droop control method suitable for flexible direct current distribution system |
Non-Patent Citations (1)
| Title |
|---|
| 考虑功率裕度与系统稳定性的直流电网自适应下垂控制;彭乔，刘天琪，张英敏，李保宏，唐铄雅;《中国电机工程学报》;20180620;第38卷(第12期);3498-3506 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110492520A (en) | 2019-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109120005B (en) | Power coordination control method for multi-terminal flexible direct current transmission system | |
| CN110492520B (en) | DC voltage slope control strategy based on converter capacity and regulation speed | |
| WO2015131602A1 (en) | Method for coordinating and controlling multi-terminal flexible direct current transmission system | |
| CN109274113B (en) | Nonlinear droop control method for hybrid multi-terminal direct current transmission system | |
| CN106451515B (en) | Broad sense droop control method suitable for Multi-end flexible direct current transmission system | |
| US10840702B2 (en) | Direct current power grid voltage control method | |
| CN106208031B (en) | It can inhibit the improvement droop control method and system of circulation in direct-current micro-grid | |
| KR20200042018A (en) | Method and device for controlling voltage and current in a DC power transmission system | |
| CN105406488A (en) | Overvoltage inhibition method based on reactive power regulation of photovoltaic inverter | |
| CN116169705A (en) | Multipoint direct-current voltage non-difference coordination control method for VSC-MTDC system | |
| CN115940656A (en) | Droop coefficient self-adaptive parallel resonant converter control method | |
| CN112086985A (en) | Coordination control strategy of hybrid dual-feed system considering active transmission capacity | |
| CN104410312A (en) | Paralleled current sharing control method of photovoltaic inverter | |
| Ahmadinia et al. | Coordinated Control of STATCOM and ULTC to Reduce Capacity of STATCOM | |
| CN107370173B (en) | Additional frequency rate-voltage damping control method | |
| US20210126462A1 (en) | Coordinated control method and device for series voltage source converter valve group | |
| CN103107789B (en) | The variable gain amplifier that a kind of common-mode feedback resistor shares | |
| CN107612000B (en) | Primary frequency modulation bidirectional slip power correction control method for thermal generator set | |
| CN112531763A (en) | Nonlinear droop control method applied to direct-current power distribution network converter station | |
| KR102533075B1 (en) | Capacitor-less low dropout regulator using dual feedback loop structure | |
| CN110994669B (en) | Control method and system for centralized inverter of photovoltaic power station | |
| JP5917950B2 (en) | Distribution line voltage adjustment method and voltage regulator | |
| CN110137997B (en) | DC voltage cooperative control method for series-parallel connection type AC-DC conversion device | |
| CN113572384A (en) | Inverter variable-step load reduction control method | |
| CN109361221B (en) | Method and system for calculating reactive power reserve margin of minimum area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |