CN109212352B - Simulation test method for identifying flexible direct current nonlinear power characteristics - Google Patents
Simulation test method for identifying flexible direct current nonlinear power characteristics Download PDFInfo
- Publication number
- CN109212352B CN109212352B CN201811107271.1A CN201811107271A CN109212352B CN 109212352 B CN109212352 B CN 109212352B CN 201811107271 A CN201811107271 A CN 201811107271A CN 109212352 B CN109212352 B CN 109212352B
- Authority
- CN
- China
- Prior art keywords
- flexible direct
- direct current
- power
- power grid
- alternating current
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- 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
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a simulation test method for identifying the nonlinear power characteristic of flexible direct current, which comprises the steps of establishing a simulation model of a flexible direct current and alternating current power grid series-parallel system, connecting a flexible direct current converter station with an alternating current power grid Thevenin equivalent system, and connecting the flexible direct current converter station with a flexible direct current control system; simulating the electric potential in the Thevenin equivalent system of the alternating current power grid to perform half-cycle falling and lifting; potential disturbance is applied to the Thevenin equivalent system of the alternating current power grid, and response data of the voltage amplitude of the flexible direct current converter bus, the active power and the reactive power output by the flexible direct current converter station and relevant electrical quantity inside the flexible direct current control system are extracted through time domain simulation calculation; and drawing characteristic curves of active power, reactive power and the like of the converter station along with the change of the voltage of the converter bus. The invention can intuitively and clearly inspect the flexible direct current control mode and the like, and is beneficial to mastering the characteristics of a series-parallel system.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a simulation test method for identifying flexible direct current nonlinear power characteristics.
Background
The converter has the technical advantages of independent control of active power and reactive power, no commutation failure, capability of supplying power to a passive power grid and the like, so the flexible direct-current power transmission based on the fully-controlled device has wide application prospect in a power system. In recent years, with the rapid development of high-capacity power electronic devices and advanced control technologies, the voltage level and the power transmission capacity of flexible direct current power transmission are both greatly improved, and the application of the flexible direct current power transmission in a main power transmission network is increasing day by day, such as a north-expanding flexible direct current power transmission project in a north China power grid, a flexible direct current asynchronous interconnection project in a south-west power grid, and the like.
With the rapid development and application of flexible direct current, the dynamic interactive coupling characteristic of the flexible direct current and an alternating current power grid, the stability characteristic and the control strategy under the large disturbance of a flexible direct current and alternating current power grid hybrid system become key points and hot points of attention in academic circles and engineering circles increasingly. When the power grid is subjected to large disturbance impact which causes the voltage of a converter bus to change remarkably due to short-circuit fault and the like, active power and reactive power which are dynamically interacted between the flexible direct current converter station and the power grid can show nonlinear change characteristics, and therefore alternating-direct current coupling interaction is formed, and dynamic behavior and stability of a series-parallel power grid are more complex.
Due to the fact that the active power and reactive power exchanged between the flexible direct current converter station and the alternating current power grid under the large disturbance impact have nonlinear characteristics in change, the large disturbance power characteristics are difficult to obtain through an analytical method. In order to overcome the above problems, the existing chinese invention patent (107102567A) discloses a simulation test system and a test method, including: the device comprises a real-time simulator, a power module characteristic simulation device and a flexible direct current control protection device; the real-time simulator is connected with the power module characteristic simulation device through Aurora communication; the power module characteristic simulation device is connected with the flexible direct current control protection device in an optical fiber communication mode; the real-time simulator is used for simulating the working states of an alternating current power grid, a direct current power grid and the flexible direct current power transmission device, and the power module characteristic simulation device is used for simulating the working characteristics of a power module in the flexible direct current power transmission device. Although the performance of the flexible direct current control protection device can be tested, the flexible direct current control mode and the mechanism of mutual influence between the alternating current power grid voltage and the flexible power cannot be intuitively and clearly investigated, and therefore the characteristics of a series-parallel system cannot be mastered, and effective stable control measures cannot be formulated.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art that the characteristics of the hybrid system cannot be effectively mastered and effective stability control measures cannot be formulated, so as to provide a simulation test method for identifying the flexible dc nonlinear power characteristics, which effectively masters the characteristics of the hybrid system and formulates effective stability control measures.
In order to solve the technical problem, the simulation test method for identifying the nonlinear power characteristic of the flexible direct current is characterized in that a flexible direct current and alternating current power grid series-parallel system simulation model is established, so that a flexible direct current converter station is connected with an alternating current power grid Thevenin equivalent system, and the flexible direct current converter station is connected with a flexible direct current control system; simulating the potential in the Thevenin equivalent system of the alternating current power grid to perform half-cycle dropping and lifting; potential disturbance is applied to the Thevenin equivalent system of the alternating current power grid, and response data of the voltage amplitude of the flexible direct current converter bus, the active power and the reactive power output by the flexible direct current converter station and relevant electrical quantity inside the flexible direct current control system are extracted through time domain simulation calculation; and drawing characteristic curves of active power, reactive power and the like of the converter station along with the change of the voltage of the converter bus.
In an embodiment of the present invention, the method for establishing the simulation model of the flexible dc-ac grid series-parallel system includes: and establishing a simulation model by using power system simulation software PSD-BPA or power system simulation comprehensive program PSASP.
In an embodiment of the invention, the flexible dc converter station is connected to the alternating current grid thevenin equivalent system through an alternating current grid thevenin equivalent internal reactance.
In one embodiment of the invention, the potential in the Thevenin equivalent system of the alternating current power grid is Es, and
wherein E s0 、ΔE s And omega s Respectively representing the steady-state initial value, disturbance amplitude and disturbance angular frequency t of the internal potential of the Thevenin equivalent system of the alternating current power grid f Is the disturbance start time.
In one embodiment of the present invention, after said step S4 is completed, the influence of the control parameter on the characteristic curve is considered.
In one embodiment of the invention, the effect of the flexible dc operating power level on the characteristic curve is further considered.
In an embodiment of the invention, the operation conditions of the series-parallel system under different strengths of the alternating current power grid are further considered.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the simulation test method for identifying the flexible direct current nonlinear power characteristic draws characteristic curves of active power, reactive power and the like of the converter station changing along with the voltage of the converter bus, can visually and clearly investigate the influence of a flexible direct current control mode and controller parameters on the voltage amplitude of the flexible direct current converter bus, the active power and the reactive power output by the flexible direct current converter station and a mutual influence mechanism between the voltage amplitude of the flexible direct current converter bus and the active power and the reactive power output by the flexible direct current converter station, and provides a technical support means for mastering the characteristics of a hybrid system and making effective stable control measures.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a flow chart of a simulation test method for identifying the non-linear power characteristic of the flexible DC power of the present invention;
FIG. 2 is a simulation model of the flexible DC and AC power grid series-parallel system of the present invention;
FIG. 3 illustrates the flexible DC converter bus voltage large disturbance excitation and its AC current response;
FIG. 4 illustrates the voltage large disturbance excitation and the active and reactive responses of the flexible DC converter bus according to the present invention;
FIG. 5 is a characteristic curve of the flexible DC constant active and constant reactive modes of the present invention;
FIG. 6 is a characteristic curve of the present invention in a flexible DC constant active and constant voltage mode;
FIG. 7 is the effect of parameters in FRTS on the flexible DC characteristic;
FIG. 8 is an effect of initial operating power on a flexible DC characteristic;
fig. 9 shows typical operation conditions of the series-parallel system under different strengths of the ac power grid.
Detailed Description
As shown in fig. 1 and fig. 2, the present embodiment provides a simulation test method for identifying flexible dc nonlinear power characteristics, which includes the following steps: step S1: establishing a simulation model of a flexible direct current and alternating current power grid series-parallel system, so that a flexible direct current converter station 10 is connected with an alternating current power grid Thevenin equivalent system 20, and the flexible direct current converter station 10 is connected with a flexible direct current control system; step S2: simulating the electric potential in the alternating current power grid Thevenin equivalent system 20 to perform half-cycle dropping and lifting; and step S3: potential disturbance is applied to the Thevenin equivalent system 20 of the alternating current power grid, and response data of the voltage amplitude of the flexible direct current converter bus, the active power and the reactive power output by the flexible direct current converter station and relevant electrical quantity inside the flexible direct current control system are extracted through time domain simulation calculation; and step S4: and drawing characteristic curves of active power, reactive power and the like of the converter station along with the change of the voltage of the converter bus.
In the simulation test method for identifying the flexible direct current nonlinear power characteristic in this embodiment, in step S1, a flexible direct current and alternating current power grid series-parallel system simulation model is established for testing a large disturbance power response characteristic of a flexible direct current converter station, the flexible direct current converter station is connected to an alternating current power grid thevenin equivalent system, and the flexible direct current converter station is connected to a flexible direct current control system, so that the flexible direct current control system is connected to the alternating current power grid thevenin equivalent system; in the step S2, the electric potential in the alternating current power grid Thevenin equivalent system 20 is simulated to perform half-cycle falling and lifting, and large disturbance excitation is implemented; in the step S3, by applying potential disturbance to the thevenin equivalent system 20 of the alternating current power grid, and performing time domain simulation calculation, the voltage amplitude of the flexible direct current converter bus, the active power and the reactive power output by the flexible direct current converter station, and the response data of the related electrical quantity inside the flexible direct current control system are extracted, so that key influence factors are favorably positioned; in the step S4, characteristic curves of the converter station, such as active power and reactive power, which change with the converter bus voltage are drawn, so that the influence of the flexible direct-current control mode and the controller parameters on the flexible direct-current converter bus voltage amplitude and the active power and reactive power output by the flexible direct-current converter station, and the interaction mechanism between the flexible direct-current converter bus voltage amplitude and the active power and reactive power output by the flexible direct-current converter station can be visually and clearly examined, and an effective stable control measure is formulated for mastering the characteristics of the hybrid system, and a technical support means is provided.
The method for establishing the simulation model of the flexible direct current and alternating current power grid series-parallel system comprises the following steps: and (3) establishing a simulation model by using Power System simulation Software PSD-BPA (Power System Analysis Software) or a Power System simulation comprehensive program PSASP (Power System Analysis Software Package) so as to test the large disturbance Power response characteristic of the flexible direct current converter station. As shown in fig. 2, the flexible dc converter station 10 is connected to the thevenin equivalent system 20 of the ac power grid through the thevenin equivalent internal reactance of the ac power grid, so as to facilitate testing of large disturbance power response characteristics of the flexible dc converter station.
The potential in the alternating current power grid thevenin equivalent system 20 is Es,and is
Wherein E s0 、ΔE s And ω s Respectively as the steady-state initial value, disturbance amplitude and disturbance angular frequency, t, of the electric potential in the AC power grid Thevenin equivalent system 20 f Is the disturbance start time.
The following describes in detail how to locate the key influencing factors by means of the potential Es in the said alternating current network thevenin equivalent system 20. When Δ E s ＝1.0pu、ω s ＝0.3927rad/s、t f Converter bus voltage U of =1.0s s Disturbance excitation of large-amplitude falling and rising, and large disturbance transient response of d-axis and q-axis currents output by the VSC are shown in figure 3, so that dq-axis components of the large disturbance excitation and alternating currents of the flexible direct current converter are determined, wherein the VSC usually adopts a double-loop decoupling controller with an outer loop and an inner loop, and in addition, links such as voltage and current amplitude limiting and fault ride-through strategies need to be simulated and functions such as overvoltage and overcurrent protection are required facing to VSC-HVDC practical engineering; when Δ E s ＝1.0pu、ω s ＝0.3927rad/s、t f Converter bus voltage U of =1.0s s The disturbance excitation of large-amplitude drop and rise is carried out, the active power and the reactive power absorbed by the flexible direct current converter from the alternating current power grid are shown in the attached figure 4, and therefore the active power and the reactive power exchanged between the flexible direct current converter and the alternating current power grid are determined; u under flexible direct current fixed active power and fixed reactive power control mode obtained by using large disturbance excitation method s -P c And U s -Q c Characteristic curves, as shown in FIG. 5, to determine U in flexible DC constant active and constant reactive power control mode s -P c And U s -Q c A characteristic curve; identifying the obtained U in a flexible direct current constant active power and constant voltage control mode by using a large disturbance excitation method s -P c And U s -Q c Characteristic curve, as shown in FIG. 6, to determine U in flexible DC constant active and constant voltage control mode s -P c And U s -Q c Characteristic curve.
In addition, the flexible direct current converter adopts a fixed active power P c And fixed reactive Q c Control mode, reference value P cref And Q cref 1250MW and 200MVar respectively, and the related parameter value in the fault ride-through logic is U sL1 ＝0.8pu、U sL2 ＝0.5pu、U sH ＝0.7pu、I cdF ＝0.6pu、I cuplim =1.0pu/s. Delta E in corresponding company Es s ＝1.0pu、ω s ＝0.3927rad/s、t f Converter bus voltage U of =1.0s s Active power P for large disturbance excitation and flexible direct current and alternating current power grid exchange c And reactive Q c Characteristic curve U of s -P c And U s -Q c As shown in fig. 6.
And after the step S4 is finished, considering the influence of the control parameters on the characteristic curve. In particular, the control parameter vs. the characteristic curve U may be further taken into account s -P c And U s -Q c The influence of (c). Corresponding to I in FRTS cdF 3 cases, U, with values of 0.6pu, 0.5pu and 0.4pu s -P c And U s -Q c The comparison curve of (a) is shown in fig. 7. It can be seen that in U s <U sL2 Low voltage operation interval of reducing I cdF The value can be correspondingly reduced by P c And (4) horizontal. In addition, I is reduced cdF Can promote the same P c Corresponding operating voltage U s 。
The effect of the flexible dc operating power level on the characteristic curve is further considered. Specifically, U corresponds to 3 cases with 100%, 80%, and 50% rated power PN for the initial operating power s -P c And U s -Q c The comparison curve of (a) is shown in fig. 8. As can be seen from FIG. 8, at U s <U sL2 In the low voltage operation interval, the P can be correspondingly reduced by reducing the initial operation power c And (4) horizontal. In addition, reducing the initial operating power may boost the same P c Corresponding operating voltage U s 。
The operation conditions of the series-parallel system under different strengths of the alternating current power grid are further considered. Specifically, on the basis of obtaining the flexible direct current nonlinear power characteristic through a large disturbance excitation method, the power transmission characteristic of an alternating current power grid can be combined to analyze the alternating current and direct currentAnd (3) large disturbance stability of a parallel-series system. FIG. 9 shows a power transmission characteristic curve U of an AC power grid with different intensities after a fault s -P s And flexible DC power characteristic curve U s -P c The intersection point condition of the AC-DC hybrid system is the stable operation point condition after large disturbance, the stable characteristics of the hybrid power grid can be correspondingly analyzed and corresponding control strategies can be formulated according to the stable operation point after the fault, wherein (1) to (4) are AC power grids U under different intensities s -P s Characteristic curve.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A simulation test method for identifying flexible direct current nonlinear power characteristics is characterized by comprising the following steps:
step S1: establishing a simulation model of a flexible direct current and alternating current power grid series-parallel system, connecting a flexible direct current converter station with an alternating current power grid Thevenin equivalent system, and connecting the flexible direct current converter station with a flexible direct current control system;
step S2: simulating the potential in the Thevenin equivalent system of the alternating current power grid to perform half-cycle dropping and lifting;
and step S3: potential disturbance is applied to the alternating current power grid Thevenin equivalent system, and response data of the voltage amplitude of the flexible direct current converter bus, active power and reactive power output by the flexible direct current converter station and related electrical quantities inside the flexible direct current control system are extracted through time domain simulation calculation;
and step S4: and drawing characteristic curves of active power and reactive power of the flexible direct current converter station, which are changed along with the voltage of the flexible direct current converter bus.
2. The simulation test method for identifying the flexible direct-current nonlinear power characteristic as claimed in claim 1, wherein: the method for establishing the simulation model of the flexible direct current and alternating current power grid series-parallel system comprises the following steps: and (3) establishing a simulation model by using power system simulation software PSD-BPA or a power system simulation comprehensive program PSASP.
3. The simulation test method for identifying the flexible direct current nonlinear power characteristic as claimed in claim 2, wherein: the flexible direct current converter station is connected with the alternating current power grid Thevenin equivalent system through the alternating current power grid Thevenin equivalent internal reactance.
4. The simulation test method for identifying the flexible direct-current nonlinear power characteristic as claimed in claim 1, wherein: the potential in the Thevenin equivalent system of the alternating current power grid is Es, and
wherein E s0 、△E s And ω s Respectively representing the steady state initial value, disturbance amplitude and disturbance angular frequency t of the internal potential of the Thevenin equivalent system of the alternating current power grid f Is the disturbance start time.
5. The simulation test method for identifying the flexible direct-current nonlinear power characteristic as claimed in claim 1, wherein: and after the step S4 is finished, considering the influence of the control parameters on the characteristic curve.
6. The simulation test method for identifying the flexible direct current nonlinear power characteristic as claimed in claim 1 or 5, wherein: the effect of the flexible dc operating power level on the characteristic curve is further considered.
7. The simulation test method for identifying the flexible direct-current nonlinear power characteristic as claimed in claim 1, wherein: the operation conditions of the series-parallel system under different strengths of the alternating current power grid are further considered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811107271.1A CN109212352B (en) | 2018-09-21 | 2018-09-21 | Simulation test method for identifying flexible direct current nonlinear power characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811107271.1A CN109212352B (en) | 2018-09-21 | 2018-09-21 | Simulation test method for identifying flexible direct current nonlinear power characteristics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109212352A CN109212352A (en) | 2019-01-15 |
| CN109212352B true CN109212352B (en) | 2022-10-11 |
Family
ID=64985354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811107271.1A Active CN109212352B (en) | 2018-09-21 | 2018-09-21 | Simulation test method for identifying flexible direct current nonlinear power characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109212352B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112417671A (en) * | 2020-11-18 | 2021-02-26 | 奇瑞汽车股份有限公司 | Method, device and storage medium for obtaining engine universal characteristic curve data |
| CN115986779B (en) * | 2023-03-21 | 2023-06-27 | 中国电力科学研究院有限公司 | Response-based frequency stability judging and controlling method and system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313850B (en) * | 2011-06-24 | 2014-07-23 | 中国电力科学研究院 | Physical real-time dynamic simulation device for flexible direct current transmission system |
| CN203630230U (en) * | 2013-07-22 | 2014-06-04 | 国家电网公司 | Simulation test system in flexible direct current system and wind farm parallel connection mode |
| CN103728508A (en) * | 2013-12-05 | 2014-04-16 | 国家电网公司 | Device and method for testing steady-state operation of MMC flexible direct current sub-module |
| CN104393617B (en) * | 2014-11-20 | 2016-11-23 | 华北电力大学（保定） | A kind of topological structure of multiterminal flexible direct current power distribution network dynamic simulation experiment system |
| CN204790353U (en) * | 2015-07-08 | 2015-11-18 | 中国南方电网有限责任公司电网技术研究中心 | Hybrid simulation system for hybrid simulation of power system |
| CN106410835A (en) * | 2016-10-12 | 2017-02-15 | 北京科东电力控制***有限责任公司 | Power grid simulation realization method of multi-terminal flexible direct-current transmission system |
| CN107123981B (en) * | 2017-03-31 | 2021-08-06 | 全球能源互联网研究院 | Flexible direct current and direct current power grid electromechanical transient simulation method and system based on MMC |
| CN106953330B (en) * | 2017-04-27 | 2021-04-02 | 上海交通大学 | Power flow controller for flexible direct current power distribution network and control method |
| CN107942172B (en) * | 2017-12-01 | 2020-08-21 | 华北电力科学研究院有限责任公司 | Damping characteristic test system and method for fan and flexible direct current transmission combined system |
| CN108011391B (en) * | 2017-12-13 | 2019-09-17 | 武汉大学 | The flexible DC transmission hybrid simulation system power interface algorithm of virtual resistance compensation |
-
2018
- 2018-09-21 CN CN201811107271.1A patent/CN109212352B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109212352A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018014450A1 (en) | Rt-lab-based real microgrid operation dynamic simulation testing platform | |
| CN203276027U (en) | Digital dynamic closed-loop test system of electricity smooth and steady supply device | |
| WO2013000241A1 (en) | Simulation method for recurrence of power grid fault | |
| CN105429132B (en) | Method for constructing motor load model | |
| CN103605829A (en) | Equivalent model method for performing electromagnetic transient simulation on alternating current/direct current hybrid power grid | |
| CN105429131B (en) | Load model construction method considering load frequency characteristics | |
| CN104578049B (en) | A kind of transient power quality analysis system of electromechanical electromagnetic transient hybrid simulation | |
| CN109212352B (en) | Simulation test method for identifying flexible direct current nonlinear power characteristics | |
| CN112883592B (en) | Full-electromagnetic transient modeling method for power grid | |
| CN115358079A (en) | Method for constructing real-time simulation model of wind power plant station and impedance characteristic evaluation method | |
| CN106950512A (en) | A kind of energy accumulation current converter and off-network characteristic integrated detection system and method | |
| Parizad et al. | Real-time simulator and offline/online closed-loop test bed for power system modeling and development | |
| Li et al. | An integrated online dynamic security assessment system for improved situational awareness and economic operation | |
| CN106505563B (en) | Toughness evaluation method for grid-connected converter under power grid fault | |
| Rolán et al. | Voltage recovery influence on three‐phase grid‐connected inverters under voltage sags | |
| Li et al. | Research on HIL-based HVRT and LVRT automated test system for photovoltaic inverters | |
| Hou et al. | Measurement-based load modeling at distribution level with complete model structure | |
| CN108984847B (en) | Real-time digital hybrid simulation interface method based on frequency division impedance compensation | |
| Gérin-Lajoie et al. | Simulation of an extra large network in EMTP: From electromagnetic to electromechanical transients | |
| CN108233356A (en) | A kind of photovoltaic DC-to-AC converter controller method for assessing consistency and its Evaluation Platform | |
| CN113437732B (en) | Pilot protection method and system for photovoltaic power generation grid-connected tie line | |
| CN102946103B (en) | Active electric power filter device with self-testing function and testing method | |
| Su et al. | A new approach for integration of two distinct types of numerical simulator | |
| CN111737875B (en) | Active power unbalance rate analysis and diagnosis method, system and computer equipment | |
| CN113705138A (en) | Online safety assessment method for large-scale alternating current and direct current power grid |
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 |