CN105183999A - Method for calculating maximum short circuit current of electric power system with photovoltaic power station - Google Patents
Method for calculating maximum short circuit current of electric power system with photovoltaic power station Download PDFInfo
- Publication number
- CN105183999A CN105183999A CN201510592005.2A CN201510592005A CN105183999A CN 105183999 A CN105183999 A CN 105183999A CN 201510592005 A CN201510592005 A CN 201510592005A CN 105183999 A CN105183999 A CN 105183999A
- Authority
- CN
- China
- Prior art keywords
- current
- photovoltaic plant
- photovoltaic
- voltage
- electric
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 238000010586 diagram Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a method for calculating the maximum short circuit current of an electric power system with a photovoltaic power station, and relates to the technical field of new energy electric power system setting calculation. The method includes the following steps that 1, connection of the photovoltaic power station is not considered, and the voltage of a grid connection point of the photovoltaic power station and a three-phase short circuit current of a fault point are calculated with an existing method; 2, it is only considered that the photovoltaic power station is connected in a fully-loaded running mode, a calculation model is switched according to the voltage of the grid connection point of the photovoltaic power station and low-voltage ride-through curve obtaining conditions, and an injection current of the photovoltaic power station is calculated; 3, the current, flowing to the fault point in a divided mode, of the injection current is calculated, in-phase adding is carried out on the current and the current, calculated in the step 1, of the fault point, and the total current of the fault point is obtained; in other words, the maximum short circuit current of the electric power system with the photovoltaic power station is obtained. According to the method, the calculation process is simple and accurate, and a good foundation is laid for work such as protection and setting of the electric power system with the photovoltaic power station.
Description
Technical field
The present invention relates to New-energy power system adaptive setting technical field, particularly relate to a kind of electric system maximum short circuit current computing method containing photovoltaic plant.
Background technology
In recent years, along with the continuous expansion of parallel network power generation scale, photovoltaic generation also starts to receive much concern on the impact of electrical network, especially on the impact of electric grid relay protection.Power System Shortcuts Current calculation is the basis of carrying out relay protection setting calculation; but the short circuit calculation model of photovoltaic plant is still not clear; ignored or be used as normal power supplies process and will certainly be caused comparatively big error, affected relay protection fixed value setting, and then threatened the safe operation of whole system.Therefore, study photovoltaic plant fault characteristic and then obtain its short circuit calculation model, and the Power System Shortcuts current calculation method provided containing photovoltaic plant is significant.
One of Power System Shortcuts Current calculation containing photovoltaic plant is crucial is photovoltaic plant short circuit calculation model, but there is no unified computation model at present.The short circuit calculation model of common photovoltaic plant mainly contains several as follows: (1) impedance expression under outer shroud PI control, inner ring P derive inverter frequency domain under controlling, thus photovoltaic DC-to-AC converter equivalence is become the voltage source of series impedance; (2) on the basis of (1), when after photovoltaic DC-to-AC converter current inner loop amplitude limit, equivalence is constant current supply; (3) equivalent one-tenth constant power source (Voltage-controlled Current Source) during the non-amplitude limit of current inner loop, converts constant current supply to when current limit.There is control block diagram, difficult parameters to obtain in these models, the criterion of models switching is indefinite, and problems such as counting short dot is shunted or superposed to Injection Current how in actual computation.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of electric system maximum short circuit current computing method containing photovoltaic plant, and described method computation process is simple, accurately, for good basis has been established in the protection of the electric system containing photovoltaic plant, the work such as to adjust.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of electric system maximum short circuit current computing method containing photovoltaic plant, is characterized in that described method comprises the steps:
1) do not consider the access of photovoltaic plant, adopt existing method to calculate photovoltaic electric station grid connection point voltage and trouble spot three short circuit current;
2) only consider that photovoltaic electric is packed and send out access, and switch computation model according to photovoltaic electric station grid connection point voltage and low-voltage crossing curve acquisition situation, calculate photovoltaic plant Injection Current;
3) calculate Injection Current and branch to the electric current of trouble spot, and with step 1) current in the fault point that calculates carries out cophase stacking, obtain the total current of trouble spot, namely obtain the electric system maximum short circuit current containing photovoltaic plant.
Further technical scheme is: described step 2) be further: the access only considering photovoltaic plant, and suppose that photovoltaic plant is in full hair-like state, switch computation model according to photovoltaic electric station grid connection point voltage and low-voltage crossing curve acquisition situation, calculate the electric current that photovoltaic plant injects.
Further technical scheme is: described step 2) be specially:
(1) kind method: under not obtaining actual low-voltage crossing curve condition, according to the electric current of the lower voltage ride-through requirement calculating photovoltaic plant injection that Grid code specifies; The short-circuit current that photovoltaic plant provides calculates according to formula (1), when photovoltaic electric station grid connection point voltage is lower than 0.2pu, need not consider short circuit current contribution; When photovoltaic electric station grid connection point voltage is between 0.2pu to 1/kpu, constant current supply model is adopted to calculate Injection Current kpu; When photovoltaic plant site voltage is higher than 1/kpu, adopt constant power source model to calculate Injection Current, now, current value and grid-connected point voltage are inversely proportional to:
In formula, I
pvfor photovoltaic plant Injection Current; U
pccfor photovoltaic electric station grid connection point voltage;
(2) kind method: under obtaining actual low-voltage crossing curve condition, according to the electric current that actual light overhead utility low-voltage crossing capacity calculation photovoltaic plant injects; Photovoltaic plant can realize no-voltage pass through time, the difference of computing method and (1) kind method is that grid-connected point voltage also calculates Injection Current by constant current supply lower than 0.2pu in the case, namely such as formula shown in (2):
In formula, I
pvfor photovoltaic plant Injection Current; U
pccfor photovoltaic electric station grid connection point voltage.
Further technical scheme is: described step 3) be specially: obtain photovoltaic plant Injection Current I
pvafter calculate again and branch to the electric current I of trouble spot
k2, and with step 1) in the current in the fault point value I that calculates
k1carry out cophase stacking, obtain the total current I of trouble spot
k, namely obtain the electric system maximum short circuit current containing photovoltaic plant, wherein I
k=I
k1+ I
k2.
The beneficial effect that produces of technique scheme is adopted to be: described method computation process is simple, accurately, for good basis has been established in the protection of the electric system containing photovoltaic plant, the work such as to adjust.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the Traditional control block diagram of photovoltaic DC-to-AC converter;
Fig. 2 is photovoltaic plant typical case grid connected structure figure;
Fig. 3 be Voltage Drop not serious time photovoltaic DC-to-AC converter phase voltage analogous diagram;
Fig. 4 be Voltage Drop not serious time photovoltaic DC-to-AC converter phase current analogous diagram;
Fig. 5 be Voltage Drop not serious time photovoltaic inverter active power, reactive power and applied power analogous diagram;
Fig. 6 be Voltage Drop serious time photovoltaic DC-to-AC converter phase voltage analogous diagram;
Fig. 7 be Voltage Drop serious time photovoltaic DC-to-AC converter phase current analogous diagram;
Fig. 8 be Voltage Drop serious time photovoltaic inverter active power, reactive power and applied power analogous diagram;
Fig. 9 is the example of the Power System Shortcuts Current calculation containing photovoltaic plant;
Figure 10 is time transient magnetic when not considering photovoltaic plant;
Figure 11 is time transient magnetic when only considering photovoltaic plant.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
The invention discloses a kind of electric system maximum short circuit current computing method containing photovoltaic plant, concrete analysis and calculation procedure as follows:
Under Traditional control strategy, photovoltaic DC-to-AC converter equivalence is the theoretical analysis of constant current supply or constant power source:
Based on the combining inverter of grid voltage orientation control structure as shown in Figure 1, control system is made up of outer voltage and current inner loop.The effect of outer voltage is stable DC voltage, by pi regulator control realization.Outer voltage pi regulator exports the reference value i being current inner loop active current
d*, thus to inverter export active power regulate, current inner loop reactive current reference value i
q* then need given, as given i according to electrical network
qwhen *=0, combining inverter runs on unity power factor state, namely only to electrical network conveying active power.In order to prevent photovoltaic DC-to-AC converter electric current out-of-limit, often add clipping module in current inner loop, amplitude is set to the k of rated current doubly (generally getting 1.2 ~ 1.5).
The short trouble characteristic of photovoltaic plant depends primarily on the control of inverter, when electric system generation three-phase shortcircuit catastrophic failure but grid-connected point voltage falls not serious time, electric current does not reach current limit and thinks that irradiation does not change before and after short circuit, therefore inverter can control according to meritorious before fault and idle reference value, namely power remains unchanged, and therefore photovoltaic plant can equivalent one-tenth constant power source.When electric current reaches current limit, outer voltage controls destroyed, and current inner loop controls electric current and is no more than given limit value, and namely current constant is constant, and therefore photovoltaic plant can equivalent one-tenth constant current supply.
Under Traditional control strategy, photovoltaic DC-to-AC converter equivalence is the simulation analysis of constant current supply or constant power source:
Based on above-mentioned theory analysis, in PowerFactory software, built the photovoltaic plant typical case shown in Fig. 2 and pessimistic concurrency control, wherein photovoltaic plant rated power is 30MW, and original state is set to full sending out, and inverter current amplitude limit is 1.5 times of rated current.
(1) Fig. 3-5 be Voltage Drop not serious time photovoltaic DC-to-AC converter phase voltage, phase current and active-power P, reactive power Q and applied power S simulation result.Contravarianter voltage falls not serious, and output current increases little, the value before active power approximates fault after half cycle 10ms occurs fault.Now can think that photovoltaic plant can equivalent one-tenth constant power source.
(2) Fig. 6-8 be Voltage Drop serious time photovoltaic DC-to-AC converter phase voltage, phase current and active-power P, reactive power Q and applied power S simulation result.Contravarianter voltage falls seriously, output current increase increase, electric current after a failure about half cycle 10ms basic controlling in limit value 1.5 times of rated current.Now can think that photovoltaic plant can equivalent one-tenth constant current supply.
The concrete implementation step of this programme is as follows:
Step one: do not consider that Three-phase Power Systems calculation of short-circuit current is carried out in the access of photovoltaic plant, adopts classic method to calculate the voltage of photovoltaic electric station grid connection point and the electric current I of trouble spot
k1.
Step 2: consider only have photovoltaic plant access and suppose that photovoltaic plant is in full hair-like state, specify according to Grid code or the size I of actual light overhead utility low-voltage crossing capacity calculation photovoltaic plant Injection Current
pv.
(1) lower voltage ride-through requirement specified according to Grid code calculates.When State Grid Corporation of China company standard Q/GDW617-2011 " photovoltaic plant access electric power network technique specifies " requires that grid-connected point voltage drops to the nominal voltage of 20% to big-and-middle-sized photovoltaic plant, photovoltaic plant can ensure the 1s that is uninterruptedly incorporated into the power networks, photovoltaic electric station grid connection point voltage can return to 90% of nominal voltage after falling in 3s time, photovoltaic plant can ensure uninterruptedly to be incorporated into the power networks, and can stop to power network line power transmission at grid-connected point voltage outline line less photovoltaic power station.Therefore, the short-circuit current that photovoltaic plant provides can calculate according to formula (1), when grid-connected point voltage is lower than 0.2pu, need not consider short circuit current contribution; Grid-connected point voltage is (current limit is kpu) between 0.2pu to 1/kpu, adopts constant current supply model to calculate Injection Current kpu; Grid-connected point voltage is higher than 1/kpu, and adopt constant power source model to calculate Injection Current, current value and grid-connected point voltage are inversely proportional to.
In formula, I
pvfor photovoltaic plant Injection Current; U
pccfor photovoltaic electric station grid connection point voltage.
(2) according to actual light overhead utility low-voltage crossing capacity calculation.Current existing a lot of photovoltaic plant can realize no-voltage and pass through, and the difference of computing method and (1) kind method is that grid-connected point voltage also calculates Injection Current by constant current supply lower than 0.2pu in the case.That is:
Step 3: obtain photovoltaic plant Injection Current I
pvafter calculate again and branch to the electric current I of trouble spot
k2, and the current in the fault point I calculated with step one
k1superposition, finally obtains trouble spot maximum current value.
In order to the embodiment of above-mentioned three steps is better described, give the example shown in Fig. 9, wherein device parameter values is the value of time transient state, and has counted the impact of load.The method is used to calculate maximum short circuit current process as follows:
Before fault, photovoltaic electric is packed and is sent out, and supposes, at f point, three-phase metallic short circuit fault occurs.Figure 10 and Figure 11 is respectively the short circuit calculation equivalent circuit do not considered and only consider photovoltaic plant access.In figure, E
sfor distribution system equivalence primary power; Z
sfor the equiva lent impedance of primary power; Z
l1for circuit L
1impedance; Z
l2for circuit L
2impedance; Z
lD1for load equiva lent impedance; I
pVfor the electric current that photovoltaic plant injects; Z
tfor the impedance of photovoltaic plant step-up transformer.
By Figure 11 calculate do not consider that photovoltaic plant accesses time, fault place electric current is
Photovoltaic electric station grid connection point voltage is
The electric current I that photovoltaic plant injects
pVcalculate according to formula (1) or formula (2).
When calculating only consideration photovoltaic plant access by Figure 11, branching to fault place electric current is
By superposition principle, the maximum short circuit current at fault place is
I
k＝I
k1+I
k2(6)
Described method computation process is simple, accurately, for good basis has been established in the protection of the electric system containing photovoltaic plant, the work such as to adjust.
Claims (4)
1., containing electric system maximum short circuit current computing method for photovoltaic plant, it is characterized in that described method comprises the steps:
1) do not consider the access of photovoltaic plant, adopt existing method to calculate photovoltaic electric station grid connection point voltage and trouble spot three short circuit current;
2) only consider that photovoltaic electric is packed and send out access, and switch computation model according to photovoltaic electric station grid connection point voltage and low-voltage crossing curve acquisition situation, calculate photovoltaic plant Injection Current;
3) calculate Injection Current and branch to the electric current of trouble spot, and with step 1) current in the fault point that calculates carries out cophase stacking, obtain the total current of trouble spot, namely obtain the electric system maximum short circuit current containing photovoltaic plant.
2. the electric system maximum short circuit current computing method containing photovoltaic plant as claimed in claim 1, it is characterized in that described step 2) be further: the access only considering photovoltaic plant, and suppose that photovoltaic plant is in full hair-like state, switch computation model according to photovoltaic electric station grid connection point voltage and low-voltage crossing curve acquisition situation, calculate the electric current that photovoltaic plant injects.
3. the electric system maximum short circuit current computing method containing photovoltaic plant as claimed in claim 1, is characterized in that described step 2) be specially:
(1) kind method: under not obtaining actual low-voltage crossing curve condition, according to the electric current of the lower voltage ride-through requirement calculating photovoltaic plant injection that Grid code specifies; The short-circuit current that photovoltaic plant provides calculates according to formula (1), when photovoltaic electric station grid connection point voltage is lower than 0.2pu, need not consider short circuit current contribution; When photovoltaic electric station grid connection point voltage is between 0.2pu to 1/kpu, constant current supply model is adopted to calculate Injection Current kpu; When photovoltaic plant site voltage is higher than 1/kpu, adopt constant power source model to calculate Injection Current, now, current value and grid-connected point voltage are inversely proportional to:
In formula, I
pvfor photovoltaic plant Injection Current; U
pccfor photovoltaic electric station grid connection point voltage;
(2) kind method: under obtaining actual low-voltage crossing curve condition, according to the electric current that actual light overhead utility low-voltage crossing capacity calculation photovoltaic plant injects; Photovoltaic plant can realize no-voltage pass through time, the difference of computing method and (1) kind method is that grid-connected point voltage also calculates Injection Current by constant current supply lower than 0.2pu in the case, namely such as formula shown in (2):
In formula, I
pvfor photovoltaic plant Injection Current; U
pccfor photovoltaic electric station grid connection point voltage.
4. the electric system maximum short circuit current computing method containing photovoltaic plant as claimed in claim 1, is characterized in that described step 3) be specially: obtain photovoltaic plant Injection Current I
pvafter calculate again and branch to the electric current I of trouble spot
k2, and with step 1) in the current in the fault point value I that calculates
k1carry out cophase stacking, obtain the total current I of trouble spot
k, namely obtain the electric system maximum short circuit current containing photovoltaic plant, wherein I
k=I
k1+ I
k2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510592005.2A CN105183999B (en) | 2015-09-17 | 2015-09-17 | Electric system maximum short circuit current computational methods containing photovoltaic plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510592005.2A CN105183999B (en) | 2015-09-17 | 2015-09-17 | Electric system maximum short circuit current computational methods containing photovoltaic plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105183999A true CN105183999A (en) | 2015-12-23 |
| CN105183999B CN105183999B (en) | 2018-06-29 |
Family
ID=54906078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510592005.2A Expired - Fee Related CN105183999B (en) | 2015-09-17 | 2015-09-17 | Electric system maximum short circuit current computational methods containing photovoltaic plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105183999B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356819A (en) * | 2016-09-27 | 2017-01-25 | 华北电力大学 | Method for protecting collection system line in large-scale photovoltaic power station |
| CN105048459B (en) * | 2015-08-21 | 2017-07-07 | 南京工程学院 | Meter and the inverse type power supply symmetrical short-circuit of low-voltage control simplify modeling method |
| CN107508322A (en) * | 2017-09-22 | 2017-12-22 | 广东电网有限责任公司电力调度控制中心 | A kind of short-circuit fault of power system computational methods for considering photovoltaic electric station grid connection |
| CN109546682A (en) * | 2018-12-05 | 2019-03-29 | 广东电网有限责任公司 | A kind of photo-voltaic power supply short circuit calculation method |
| CN110930263A (en) * | 2019-11-15 | 2020-03-27 | 广东电网有限责任公司 | Medium-voltage distribution network short-circuit current calculation method containing photovoltaic power supply and induction motor based on black hole particle swarm algorithm |
| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077449A (en) * | 2014-07-02 | 2014-10-01 | 中国南方电网有限责任公司 | Method for calculating inverse DG penetration level on basis of particle swarm optimization |
| CN104242348A (en) * | 2014-09-24 | 2014-12-24 | 天津大学 | Calculation method for penetration level of inverter-based DG (distributed generation) |
-
2015
- 2015-09-17 CN CN201510592005.2A patent/CN105183999B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077449A (en) * | 2014-07-02 | 2014-10-01 | 中国南方电网有限责任公司 | Method for calculating inverse DG penetration level on basis of particle swarm optimization |
| CN104242348A (en) * | 2014-09-24 | 2014-12-24 | 天津大学 | Calculation method for penetration level of inverter-based DG (distributed generation) |
Non-Patent Citations (2)
| Title |
|---|
| 谭会征等: "带低电压穿越特性的逆变型分布式电源对配电网短路电流的影响", 《电力自动化设备》 * |
| 陈晓龙等: "含逆变型分布式电源的配电网自适应正序电流速断保护", 《电力***自动化》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048459B (en) * | 2015-08-21 | 2017-07-07 | 南京工程学院 | Meter and the inverse type power supply symmetrical short-circuit of low-voltage control simplify modeling method |
| CN106356819A (en) * | 2016-09-27 | 2017-01-25 | 华北电力大学 | Method for protecting collection system line in large-scale photovoltaic power station |
| CN107508322A (en) * | 2017-09-22 | 2017-12-22 | 广东电网有限责任公司电力调度控制中心 | A kind of short-circuit fault of power system computational methods for considering photovoltaic electric station grid connection |
| CN107508322B (en) * | 2017-09-22 | 2018-06-08 | 广东电网有限责任公司电力调度控制中心 | A kind of short-circuit fault of power system computational methods for considering photovoltaic electric station grid connection |
| CN109546682A (en) * | 2018-12-05 | 2019-03-29 | 广东电网有限责任公司 | A kind of photo-voltaic power supply short circuit calculation method |
| CN109546682B (en) * | 2018-12-05 | 2021-07-13 | 广东电网有限责任公司 | Photovoltaic power supply short circuit calculation method |
| CN110930263A (en) * | 2019-11-15 | 2020-03-27 | 广东电网有限责任公司 | Medium-voltage distribution network short-circuit current calculation method containing photovoltaic power supply and induction motor based on black hole particle swarm algorithm |
| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
| CN112255567B (en) * | 2020-10-16 | 2023-05-09 | 西安石油大学 | Short-circuit current rapid determination method for power distribution network containing photovoltaic power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105183999B (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11791632B2 (en) | High-frequency uncontrolled rectifier-based DC transmission system for offshore wind farm | |
| CN105183999A (en) | Method for calculating maximum short circuit current of electric power system with photovoltaic power station | |
| CN112421670B (en) | Intermediate-frequency flexible direct-current power transmission system suitable for sending out wind power from open sea and control method thereof | |
| CN103064023B (en) | For grid-connected proving installation and the method for testing thereof of wind-powered electricity generation and photovoltaic | |
| CN102916437B (en) | The soft combination method of a kind of grid-connected converter | |
| CN103091578A (en) | Island detection method of photovoltaic grid-connected system | |
| CN104734191A (en) | Photovoltaic grid-connected inverter low-voltage ride through method based on reactive current injection | |
| CN107069809A (en) | A kind of directly driven wind-powered current transformer high voltage crossing control method | |
| CN107732905A (en) | The short-circuit current calculation method of current transformer grid type distributed power source | |
| CN104111406A (en) | Frequency feedback disturbance-based island detection method and apparatus | |
| CN103618308A (en) | Alternating current line power flow automatic control method of alternating current and flexible direct current parallel power transmission system | |
| Li et al. | Voltage support strategy of SNOP under fault circumstance | |
| CN103972921B (en) | A kind of permanent-magnet synchronous wind energy turbine set low voltage crossing control method for coordinating based on power-balance | |
| CN103501010B (en) | The wind energy turbine set reactive power support method of a kind of pair of Hysteresis control | |
| WO2024037429A1 (en) | Method and system for calculating main-loop parameters of slcc, and readable medium | |
| CN106816889B (en) | Gird-connected inverter power decoupled method and device | |
| CN103812133A (en) | Grid-connected photovoltaic power station power control system and remote control method thereof | |
| CN204030623U (en) | The power control system at grid-connected photovoltaic power generation station | |
| Xi et al. | STATCOM control and operation with series connected transformer based 48-pulse VSC | |
| Li et al. | The realization of flexible photovoltaic power grid-connection μ-synthesis robust control in microgrid | |
| Kumar et al. | A case study on self healing of smart grid with islanding and inverter volt-var function | |
| Vignali | The impact of renewable energy on voltage stability and fault level in power systems | |
| CN220775399U (en) | Intelligent parallel-off-network frequency modulation management system | |
| Ding et al. | Detailed modeling of China-Russia Heihe back-to-back HVDC project using PSCAD/EMTDC | |
| Wei et al. | Fault model of inverter interfaced distributed generator adopting pq control strategy considering current tracking capability of converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 Termination date: 20180917 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |