CN107947152B - Medium-and-long-term dynamic simulation stability strategy modeling method based on virtual power grid - Google Patents
Medium-and-long-term dynamic simulation stability strategy modeling method based on virtual power grid Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a medium-and-long-term dynamic simulation stability strategy modeling method based on a virtual power grid, and relates to the technical field of safety and stability analysis and evaluation of power systems. The method for modeling the medium-long term dynamic simulation stability strategy based on the virtual power grid realizes the bridge crossing switching of fault discrimination conditions and control measure signals in a PSD-FDS program safety automatic device model and a stability control strategy model by constructing the virtual power grid consisting of virtual electric elements such as a virtual circuit, a virtual load and a virtual generator, further completes the combined calling of the safety automatic device model and the stability control strategy model, and realizes the modeling and verification of a multi-criterion stability strategy of the complex power grid.
Description
Technical Field
The invention belongs to the technical field of analysis and evaluation of safety and stability of a power system, and particularly relates to a medium-and-long-term dynamic simulation stability strategy modeling method based on a virtual power grid.
Background
The power industry is the basic industry of modern society, the operation of electric power system has to the various aspects of social economic life, and safe, economic, lasting, stable power supply is the basic requirement to electric power work. Various devices of the power system, including primary devices such as a generator, a transformer, a power transmission line and a circuit breaker and secondary devices matched with the primary devices, have different types of faults, so that the normal operation of the power system and the normal power supply to users are influenced. In order to ensure the safe operation of the power system, a safety and stability control device and a system (hereinafter referred to as a safety and stability system) which are matched with each other are usually arranged at important nodes of the power system, the real-time operation state of the power grid is monitored on line, and real-time early warning and dynamic decision are implemented according to a preset safety and stability strategy (hereinafter referred to as a safety and stability strategy) aiming at various possible faults, so that the accident of the power grid is prevented from being expanded, and the reliable guarantee is provided for the safe operation of the power system.
In order to ensure the safety and stability of the power system in actual operation, the dynamic behavior of the power system is inconvenient to be researched by adopting an online physical disturbance test method. At present, the dynamic behaviors of the power system and the device are mainly simulated and researched by using an off-line calculation method of power system simulation software. Models for power system stability strategies can be divided into six categories: device class, monitoring class, pressure plate class, public data class, control measure class and stability control strategy class. The dynamic simulation program (PSD-FDS) of the whole process of the power system can organically unify the electromechanical transient, medium-term and long-term dynamic processes of the power system for digital simulation, and is the only simulation calculation tool which can implement the stability strategy modeling at present.
PSD-FDS provides a safety automatic device model and a stability control strategy model 2, which are used for modeling a stability strategy. The safety automatic device model comprises an overload control device model (STAB OL), a low-frequency load shedding (splitting) model (STAB LF), a low-voltage load shedding (splitting) (STAB LV), a high-frequency splitting (splitting) model (STAB HF), an overvoltage splitting (splitting) (STAB HV) and an OUT-of-step splitting (STAB OS) model, and the modes of a safety automatic device function model (such as a STAB LF card and the like) and a control measure model (STAB OUT card) are adopted to jointly form a complete model, so that the functions of corresponding devices in an actual system can be well covered. A complete safety and stability control strategy model is generally composed of a station information card, a plurality of section information cards, a cutter sequence card, a load shedding proportion distribution card, a strategy card and a control measure card. Wherein, a complete control strategy realizes the control function by a plurality of strategy trigger condition cards (and logic among strategies) and a plurality of control measure cards (corresponding to different control objects). The safety automatic device model does not support parallel condition judgment, and the stability control strategy model supports combinational logic judgment of trigger conditions; the control measure cards of the safety automatic device model and the stability control strategy model are not overlapped in function, and the functions cannot be mutually covered.
Due to the functional limitations of the PSD-FDS program itself, the safety robot model and the stability control strategy model cannot be used in a mixed manner. The method comprises the steps of judging fault N-M, judging branch fault type, judging AC branch switching state, judging AC branch transmission power, judging section transmission power and judging fault judging conditions (overload, low frequency, low voltage, high frequency and overvoltage) in a safety automatic device model, wherein the fault judging conditions are provided by a stability control strategy triggering condition model (STAB COND), and the safety automatic device model and the stability control strategy model have relatively independent control measure cards and cannot be called mutually. In view of the fact that a stability strategy in actual operation of a modern power system is generally composed of a plurality of strategy starting judgment objects and a plurality of anti-error criteria in a certain logical relationship, and complex control measures are implemented, a model provided in the PSD-FDS is not enough to completely cover the complex stability strategy and control action in the actual system at present.
Based on the method, the medium-and-long-term dynamic simulation stability strategy modeling method based on the virtual power grid is provided, a gap bridge circuit is built by means of the virtual power grid, the function of an intermediate relay is realized, the problem of hybrid modeling of a safety automatic device model and a stability control strategy model is solved, and the application range of PSD-FDS for realizing complex power network stability strategy modeling is expanded.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a medium-and-long-term dynamic simulation stability strategy modeling method based on a virtual power grid in order to realize the evaluation of a complex stability strategy consisting of a plurality of criteria on the safe operation state of a power system.
The invention solves the technical problems through the following technical scheme: a middle-long term dynamic simulation stability strategy modeling method based on a virtual power grid is characterized in that virtual elements which do not exist relative to an actual simulation power grid are added in a flow data file of PSD-FDS middle-long term simulation, the virtual power grid used for transmitting stability control signals is constructed, and interconnection and mutual calling of a safety automatic device model and a stability control strategy model are achieved by means of bridging of the virtual power grid.
Further, the virtual elements comprise virtual lines, virtual loads and virtual generators.
Further, the stability control strategy model detects the running state of the actual power grid, implements combinational logic judgment, and outputs corresponding control measures; if the stability control strategy model meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, control measures are output to the virtual power grid, the running state of the virtual power grid is changed, the state of the virtual power grid is further detected by the safety automatic device, and the control measures which cannot be directly implemented by the stability control strategy model are executed. The constructed virtual power grid and the actual power grid are isolated from each other, the control output of the stability control strategy model does not influence the state of the actual power grid, but a fault judgment condition triggering the action of the safety automatic device can be constructed by changing the operation of a line, a load and a generator in the virtual power grid, the safety automatic device model further acts after detecting the change of the state of the virtual power grid, and the control operations of load shedding, generator tripping, splitting and the like of the actual power grid are implemented in turns.
Further, the stability control strategy model respectively carries out combined logic judgment according to the section N-M fault, the branch fault, the operation state of the alternating current branch, the section transmission power and the branch transmission power, and outputs corresponding control measures of the generator tripping, load shedding, branch shedding and direct current bus line locking.
Further, the safety automatic device model detects the running state of the actual power grid and outputs corresponding control measures; if the safety automatic device model meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, the control measures are output to the virtual power grid, the running state of the virtual power grid is changed, the virtual and actual power grid states are further detected by the stability control strategy model, the combinational logic judgment which cannot be directly realized by the safety automatic device is completed, and then the appropriate control measures are output. The constructed virtual power grid and the actual power grid are isolated from each other, the control output of the safety automatic device does not influence the state of the actual power grid, but a fault judgment condition triggering the action of the stability control strategy model can be constructed by changing the operation of a line, a load and a generator in the virtual power grid, the stability control strategy model further acts after detecting the state change of the virtual power grid, and the control operations such as branch cutting, load cutting, generator cutting, direct current circuit locking and the like of the actual power grid are implemented.
Further, the safety automatic device model carries out fault discrimination according to the overload control device model, the low-frequency load reduction model, the low-voltage load reduction model, the high-frequency cutting machine model, the overvoltage cutting machine model and the out-of-step disconnection model respectively, and outputs corresponding control measures of wheel cutting, load cutting, branch cutting and disconnection.
Furthermore, the stability control strategy model and the safety and stability strategy of the safety automatic device model are cross-combined, so that the interconnection and mutual calling of the safety automatic device model and the stability control strategy model are realized under the condition of ensuring clear signal transmission logic relation, and the support for the complex stability and stability combination logic judgment condition and the output measure of the actual power grid is realized.
Compared with the prior art, the medium-and-long-term dynamic simulation stability strategy modeling method based on the virtual power grid has the following beneficial effects:
1. a virtual element for constructing a virtual network provides a bridge signal to realize the control measure of calling a safety automatic device model by a stability control strategy model or the control measure of calling the stability control strategy model by the safety automatic device model;
2. a virtual element for constructing a virtual network provides a bridge signal, and a stable control strategy model utilizes a fault judgment condition of a safety automatic device model, or the safety automatic device model calls the stable control strategy model to complete logic combination of trigger conditions;
3. the virtual network adopts a plurality of strategies to be combined in a cross mode, the support range of the modeling of the safety and stability strategy of the actual power grid is expanded, undefined complex logic combination and control output models in the PSD-FDS can be simulated, and the implementation difficulty of the modeling of the complex safety and stability strategy is reduced;
4. the virtual power grid and the actual power grid are mutually independent, the virtual power grid only plays a role in bridging intermediate signals, and the load flow, stability, transient state and medium-long term dynamic simulation calculation of the actual power grid are not influenced;
5. the modularization of the virtual power grid and the combinational logic can be realized, and the stability strategy modeling process of the actual power grid is accelerated.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a medium-and-long-term dynamic simulation stability strategy modeling method based on a virtual power grid;
wherein: 1-stability control strategy model, 2-safety automatic device model;
fig. 2 is a system wiring diagram of an embodiment of the invention.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the modeling method of the safety and stability strategy for the medium and long term dynamic simulation based on the virtual power grid provided by the invention is that virtual elements such as virtual circuits, virtual loads, virtual generators and the like which do not exist in the actual simulation power grid are added in a load flow data file of the PSD-FDS for the long term simulation, so as to construct the virtual power grid for transmitting the stability control signal, and the interconnection and the mutual calling of the safety automatic device model 2 and the stability control strategy model 1 are realized by bridging of the virtual power grid.
The stability control strategy model 1 detects the running state of an actual power grid, carries out combined logic judgment according to the fault N-M of the section, the fault of the branch, the running state of the AC branch, the transmission power of the section and the transmission power of the branch, and outputs corresponding control measures of a generator tripping, load shedding, branch shedding and direct current bus line locking; if the stability control strategy model 1 meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, control measures are output to the virtual power grid, the running state of the virtual power grid is changed, the state of the virtual power grid is further detected by the safety automatic device model 2, and the control measures which cannot be directly implemented by the stability control strategy model 1 are executed.
The safety automatic device model 2 detects the running state of an actual power grid, carries out fault judgment according to an overload control device model, a low-frequency load reduction model, a low-voltage load reduction model, a high-frequency generator tripping model, an overvoltage generator tripping model and an out-of-step tripping model respectively, and outputs corresponding wheel-dividing secondary generator tripping, load cutting, branch cutting and tripping control measures; if the safety automatic device model 2 meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, control measures are output to the virtual power grid, the running state of the virtual power grid is changed, the virtual and actual power grid states are further detected by the stability control strategy model 1, the combinational logic judgment which cannot be directly realized by the safety automatic device is completed, and then appropriate control measures are output.
The stability control strategy model 1 and the safety automatic device model 2 are combined in a cross mode, interconnection and mutual calling of the safety automatic device model 2 and the stability control strategy model 1 are achieved under the condition that the clear signal transmission logic relation is guaranteed, and support for the complex stability combination logic judgment condition and the output measure of the actual power grid is achieved.
Taking the stability policy of a certain area in Guangxi as an example for explanation, the wiring diagram is shown in FIG. 2;
starting conditions are as follows: overload and low voltage are applied to the lines I and II of the greeting roads;
the anti-error criterion is as follows: stopping the transportation of the congratulatory lane III line, the congratulatory bus I line and the congratulatory bus II line;
and (4) policy action: the loads of the curbstone, the Huifeng, the Xindu and the Fujian navigation station are cut off in turns.
Because the PSD-FDS stability strategy does not support direct bus load shedding, the load shedding in turns is realized by using 2 stability strategies in a mode of adding virtual intermediate relays, and the low-voltage detection of the intermediate relays is realized by adding virtual power grid branches.
Adding virtual nodes HEZHOUV5 and 5 virtual lines in the tide data file dat, configuring the impedances of the first 3 virtual lines to be 0.00002, 0.00002 and 0.00001 respectively, triggering the virtual line 3 with small impedance to be cut after the first policy action, and causing the other virtual line 1 to be overloaded to realize load cutting. The relevant description is as follows:
1. setting impedance to make the ratio of current flowing through the virtual line 1: 1: 2, the current of the virtual lines 1 and 2 is doubled after the virtual line 3 is cut, and the current of the virtual line 1 is doubled after the virtual line 2 is cut again.
2. And adding virtual nodes, wherein the virtual load on the nodes is 0.1 MW.
B HEZHOUV5525.N10.1
3. Add virtual line number 1, impedance 0.00002, line across balanced node BJZ500 and virtual node.
L BJZ500 525.HEZHOUV5525.1.01 .00002
4. Add virtual line number 2, impedance 0.00002, line across balanced node BJZ500 and virtual node.
L BJZ500 525.HEZHOUV5525.2.01 .00002
5. Add virtual line number 3, impedance 0.00001, line across balanced node BJZ500 and virtual node.
L BJZ500 525.HEZHOUV5525.3.01 .00001
6. And a low-voltage protection LV bridge line, low-voltage protection jump virtual lines 4 and 5 and a phase detection non-fault jump virtual line 3 in the PSD-FDS are added to realize parallel condition judgment.
7. A number 4 virtual line is added, impedance 99999, with the line connected across balanced node BJZ500 and the virtual node.
L BJZ500 525.HEZHOUV5525.4.01 99999.
8. A number 5 virtual line is added, impedance 99999, with the line connected across balanced node BJZ500 and the virtual node.
L BJZ500 525.HEZHOUV5525.5.01 99999.
9. No. 4 and No. 5 virtual circuits are used for low-voltage detection, only play the role of an intermediate relay, and have no influence on the virtual network tide before and after the virtual circuits are cut off.
Since the balance node can be regarded as an infinite power supply, and the virtual node hezhou 5 has no other connection with the actual power grid, the dynamic process and the dynamic process of the actual power grid can be regarded as 2 mutually independent processes, namely, the addition of the virtual line and the node has no influence on the calculation of the actual power grid.
The low voltage of the congratulatory road I and II is judged by using a STAB LV safety automatic device strategy, and is respectively transmitted to the No. 4 virtual line and the No. 5 virtual line, and the judgment of the low voltage of the congratulatory road I and II can be realized by judging the on-off state of the virtual lines. The corresponding strategy is implemented as follows:
1. and adding a low-voltage protection LV gap bridge line, jumping a virtual line under low-voltage protection, and detecting three phases without fault jumping in a stability control strategy to realize parallel condition judgment.
2. Judging the low voltage of the I line of the greeting road and cutting the No. 4 virtual line
3. Judging the low voltage of II lines of the congratulatory road, and cutting the virtual line No. 5
In the stability control strategy, the state of disconnection of the virtual line No. 4 and 5 is detected by using STAB COND 0 to judge whether the voltage is low, 2 strategies are used for realizing load shedding in turns according to the overload process, and the corresponding strategies are realized as follows:
STAB SIF A Taoist stone station normal mode
Using 2 strategies to realize load shedding in turns according to the degree of overload
Stopping the operation of the third line of the congratulatory road, the first line and the second line of the congratulatory road
Low voltage of I, II line of greeting road
Greeting I line overload
Greeting II line overload
Cut virtual network line 3 to realize triggering and cutting off load of road stone, Huifeng, Xindu and Min navigation station in turn
Stopping the operation of the third line of the congratulatory road, the first line and the second line of the congratulatory road
Low voltage of I, II line of greeting road
Greeting I line overload
Greeting II line overload
Cut virtual network lines 2 and 3 to realize round-by-round cutting off load of road stone, Huifeng, Xindu and Min navigation station
By cutting off the No. 2 and No. 3 virtual lines respectively, the control of the tide flowing through the No. 1 virtual line can be realized, and the gears of the No. 1 virtual line are respectively 0.025MW, 0.0333MW, 0.05MW and 0.1 MW. According to the line impedance configuration, when the virtual line 3 is cut off alone, the power flow of the virtual line 1 becomes 0.05MW, when the virtual line 2 is cut off alone, the power flow of the virtual line 1 becomes 0.0333MW, and when the virtual lines 2 and 3 are cut off at the same time, the power flow of the virtual line 1 becomes 0.1 MW. When 3 virtual circuits are operated in parallel, the power flow of the virtual circuit 1 is 0.025 MW. The first strategy causes the power flow of the virtual line 1 to become 0.05MW, and the second strategy causes the power flow of the virtual line 1 to become 0.1 MW.
And judging the overload state of the No. 1 virtual line by utilizing a STAB OL strategy of a safety automatic device, cutting loads in different proportions by utilizing different overload degrees on the virtual line 1, and cutting off loads of a road stone, a Huifeng, a Xindu and a Fujian station in turns. The corresponding strategy is implemented as follows:
cutting a virtual line, setting data requirements: dropping STAB OUT F A, no action of Haizhou stability strategy, and removing action
The first round of removing the road stone, the Huifeng, the Xindu, the Fujian navigation station has 50% of load, and the switch action time of each station is different
The second round of removing 100% of the load of the navigation station, Huifeng, Xindu, Min, and the switch action time of each station is different
The overload thresholds of the virtual line 1 with 2-round actions are respectively set to be 0.04MW and 0.07MW, loads in different areas are cut off at different times by setting the switching action time, and the load cutting proportion of 2 rounds is respectively 50% and 100%.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (5)
1. A middle-long term dynamic simulation stability strategy modeling method based on a virtual power grid is characterized in that a virtual element which does not exist relative to an actual simulation power grid is added in a flow data file of PSD-FDS middle-long term simulation, a virtual power grid for transmitting stability control signals is constructed, and interconnection and mutual calling of a safety automatic device model and a stability control strategy model are realized by bridging of the virtual power grid;
the stability control strategy model detects the running state of an actual power grid, carries out combinational logic judgment and outputs corresponding control measures; if the stability control strategy model meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, control measures are output to the virtual power grid, the running state of the virtual power grid is changed, the state of the virtual power grid is further detected by the safety automatic device, and the control measures which cannot be directly implemented by the stability control strategy model are executed.
2. The virtual power grid-based medium and long term dynamic simulation stability strategy modeling method according to claim 1, wherein the virtual elements comprise virtual lines, virtual loads and virtual generators.
3. The virtual power grid-based medium and long term dynamic simulation stability strategy modeling method according to claim 1, wherein the stability control strategy model implements combinational logic judgment according to section N-M faults, branch faults, AC branch commissioning status, section transmission power and branch transmission power, and outputs corresponding control measures of generator tripping, load shedding, branch shedding and DC bus line locking.
4. The virtual power grid-based medium and long term dynamic simulation stability strategy modeling method according to claim 1 or 2, wherein the safety automatic device model detects an operation state of an actual power grid and outputs a corresponding control measure; if the safety automatic device model meets the actual power grid requirement, directly outputting a control measure to the actual power grid; if the actual power grid constraint judgment and output control conditions are not met, outputting control measures to the virtual power grid, changing the running state of the virtual power grid, further detecting the virtual and actual power grid states by the stability control strategy model, completing the combinational logic judgment which cannot be directly realized by the safety automatic device, and outputting appropriate control measures;
and the safety automatic device model carries out fault judgment according to the overload control device model, the low-frequency load shedding model, the low-voltage load shedding model, the high-frequency cutting machine model, the overvoltage cutting machine model and the out-of-step splitting model respectively, and outputs corresponding control measures of the wheel splitting secondary cutting machine, the load cutting, the branch cutting and the splitting.
5. The virtual power grid-based medium and long term dynamic simulation stability strategy modeling method according to claim 1, wherein the stability control strategy model and the stability control strategy of the safety automatic device model are cross-combined to realize interconnection and mutual calling of the safety automatic device model and the stability control strategy model.
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