CN112260323A - Power grid long-process simulation method and system containing new energy, stored energy and flexible load - Google Patents
Power grid long-process simulation method and system containing new energy, stored energy and flexible load 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
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Abstract
The invention discloses a power grid long process simulation method and system containing new energy, stored energy and flexible load, wherein the method comprises the following steps: 1) hanging the new energy, the stored energy and the flexible load at a hanging point to perform equivalent load processing; 2) obtaining an equivalent load power curve of the hanging point; basic power curves of new energy, stored energy and flexible load; actual power curves of new energy, stored energy and flexible load; 3) calculating equivalent load power P at t moment in long-process closed-loop simulation of the hanging-point power grid based on three curves(ld,t). The invention realizes the long-process simulation of the power grid containing new energy, stored energy and flexible load, provides a vivid simulation environment for a plurality of source grid load storage cooperative control participatory objects with complex characteristics in the power grid, saves the cost of test links, enhances the test verification capability of the power grid in a real operation environment, improves the level of the refinement of power grid control by power grid regulation and control series software and the operation warp of a power grid companyEconomic benefit.
Description
Technical Field
The invention belongs to the field of simulation of power systems, and particularly relates to a simulation method and system for a long process of a power grid containing new energy, stored energy and flexible load.
Background
With the rapid development of large-scale renewable energy sources, the power supply side uncertainty increases greatly. The imbalance of energy production and consumption distribution increases the direct current receiving proportion of a receiving-end power grid; meanwhile, the wind and light power supply cannot provide rotational inertia, so that the rotational inertia of a receiving-end power grid is insufficient, and the system has an increasing demand for rapidly adjusting resources. The adjustable resources on the load side are increasingly abundant, the control mode is mature day by day, and the adjustable potential of the interactive resources on the load side can be fully developed through modes such as marketing load control, an Internet of vehicles platform, a comprehensive energy service provider and large-user direct control. The source network load interactive operation relates to the coordination of multiple systems, multiple levels and multiple roles such as scheduling, trading, marketing, power distribution and the like, the quantity of interactive resources is huge, the characteristics are different, the control means and the performance are different, and the engineering application of the source network load interactive operation also needs to carry out a great deal of analysis, research and verification. Based on the lack of a large number of engineering application examples, different business departments urgently need to develop function research and development and verification of source network load interaction related business by means of a source network load storage simulation platform.
At present, a certain foundation is provided for independent simulation of each link of source network load, and in the aspect of large power grid simulation, PSSE and PSASP are mature; in the aspect of power distribution network simulation, power distribution network trend software OpenDSS is widely used; in the aspect of load side simulation, the Energy Plus of the building Energy consumption simulation engine is also a powerful user-level load simulation tool. A power grid continuous operation simulation software V1.0 (2016SR332198) developed by the institute of Electrical Power science in China can track a specified power generation load curve, and the simulation of the continuous operation process of a power system is realized. On one hand, the simulation software cannot well realize the simulation of the whole flow of the large power grid, and on the other hand, the constructed simulation model is limited to the traditional generator, the load and the like; the simulation of new energy, stored energy and flexible load can not be realized.
Disclosure of Invention
The invention aims to provide a power grid long-process simulation method and system containing new energy, stored energy and flexible load, so as to solve the technical problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for simulating the long process of the power grid containing new energy, stored energy and flexible load comprises the following steps:
1) hanging the new energy, the stored energy and the flexible load at a hanging point to perform equivalent load processing;
2) acquiring a first curve, a second curve and a third curve of a hanging point; the first curve is an equivalent load power curve of the hanging point; the second curve is a basic power curve of the new energy of the hanging point, the stored energy and the flexible load; the third curve is an actual power curve of new energy, stored energy and flexible load at the hanging point;
3) calculating equivalent load power P at the time t in the long-process closed-loop simulation of the hanging point power grid based on the first curve, the second curve and the third curve(ld,t)。
The invention further improves the following steps: the hanging node is arranged on the 220kV side of the transformer.
The invention further improves the following steps: the first curve is generated by the power generation load curve generation function of each region in the power grid.
The invention further improves the following steps: the second curve is obtained through new energy prediction, energy storage planning or load prediction.
The invention further improves the following steps: and the third curve is obtained by presetting power fluctuation meeting the fluctuation characteristic and the power grid control target on the second curve.
The invention further improves the following steps: in step 3), calculating the equivalent load power P at the time t from the first curve, the second curve and the third curve by adopting a linear interpolation method(ld,t)。
The invention further improves the following steps: equivalent load power P at time t(ld,t)The calculation formula of (a) is as follows:
in the formula: pld (curve,t)The power at the moment t of the generated equivalent load power curve is obtained;
the baseline power of the new energy source, the stored energy or the flexible load at time t,
the actual power of the new energy, the stored energy or the flexible load at the moment t after the fluctuation or the receiving of the control instruction; and N is the total number of new energy, stored energy and flexible loads hung on the hanging points.
The invention further improves the following steps: obtaining equivalent load power P at multiple moments in long-process simulation(ld,t)And carrying out smooth connection to obtain a power grid long-process simulation power curve containing new energy, stored energy and flexible load.
The power grid long process simulation system containing new energy, energy storage and flexible load comprises:
the equivalent load processing module is used for hanging the new energy, the stored energy and the flexible load on a hanging point to perform equivalent load processing;
the power curve acquisition module is used for acquiring a first curve, a second curve and a third curve of the hanging point; the first curve is an equivalent load power curve of the hanging point; the second curve is a basic power curve of the new energy of the hanging point, the stored energy and the flexible load; the third curve is an actual power curve of new energy, stored energy and flexible load at the hanging point;
a simulation module used for calculating the equivalent load power P at the time t in the long-process closed-loop simulation of the hanging point power grid based on the first curve, the second curve and the third curve(ld,t)。
The power grid long process simulation system containing new energy, energy storage and flexible load comprises: a processor and a memory coupled to the processor, the memory storing a computer program which, when executed by the processor, implements method steps of a method for long process simulation of a power grid with new energy, stored energy and flexible loads.
Compared with the prior art, the invention has the following beneficial effects:
1. the resources of a new energy power plant, energy storage and flexible load are hung on the 220kV side of the transformer for equivalent load treatment, and the effect of the new energy power plant, the energy storage and the flexible load on the main network is reflected by influencing the power of a hanging point.
2. In order to realize 24-hour power grid long-process simulation, power curves of equivalent loads of the hanging nodes are generated through the power generation load curve generation function of each region.
3. The new energy, the stored energy and the flexible load have 2 curves, wherein 1 curve is a basic power curve (generally obtained by new energy prediction, stored energy planning and load prediction), and the other curve is an actual power curve (disturbance meeting the fluctuation characteristic of the basic power curve and a power grid control target are superposed on the basic power curve).
4. When the simulation cycle runs, the power at the moment t is calculated from an equivalent load curve, a new energy source, an energy storage and flexible load base and an actual power curve by adopting a linear interpolation method according to the current time in the long-process simulation of the power grid.
5. And at the time point when the basic power curve and the actual power curve have deviation, superposing the deviation on the original equivalent load curve, wherein the power value is equal to the sum of the power value of the load curve and the deviation amount of the articulated multi-resource power.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for simulating a long process of a power grid with new energy, stored energy and flexible loads;
fig. 2 is a block diagram of a long-process simulation system of a power grid including new energy, stored energy, and flexible loads in embodiment 2;
fig. 3 is a block diagram of a long-process simulation system of a power grid including new energy, stored energy, and flexible loads in embodiment 3.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
With the development of energy internet, more and more controllable resources such as flexible loads, distributed power supplies and energy storage are accessed into a power grid, and information interaction and coordination control with a dispatching end are realized. The power grid long-process closed-loop simulation method for new energy, stored energy and flexible load needs to be researched, a vivid simulation environment is provided for a plurality of source grid load storage cooperative control participatory objects with complex characteristics in a power grid, the cost of a test link is saved, the test verification capability of the power grid in a real operation environment is enhanced, and the lean level of power grid control by power grid regulation and control series software and the operation economic benefit of a power grid company are improved.
Example 1
The power grid long-process simulation software realizes long-process simulation by loading a multi-stage power grid model, but the model and data of a power distribution network (generally 10kV or below) with a lower voltage level, which need to be maintained, increase exponentially, and the connection mode of a power grid is greatly different from the connection mode of a power transmission network (more than 10 kV) with a high voltage level. The long-process simulation of the power grid is difficult to realize the unified calculation of the transmission and distribution network, and the power grid model adopted by the current simulation is generally established to the high/low voltage side of a 220kV transformer.
Referring to fig. 1, the method for simulating the long process of the power grid including new energy, stored energy and flexible load of the present invention includes the following steps:
new energy power plants, energy storage and flexible loads are usually located at low voltage levels, and the power grid model is not generally modeled to the low voltage levels. Therefore, the invention directly hangs the new energy, the stored energy and the flexible load on the hanging point of the 220kV side of the transformer for equivalent load treatment, and embodies the effect of the new energy, the stored energy and the flexible load on the main network by influencing the power of the hanging point. In order to realize 24-hour power grid long-process simulation, equivalent load power curves of the hanging nodes are generated through the generation load curve generation function of each region. When the new energy, the stored energy and the flexible load do not fluctuate and do not participate in the instruction of the active control of the power grid, the equivalent load connected with the resources (the new energy, the stored energy and the flexible load) obtains the power of the next moment from the curve according to the current time, and the simulation of the long process of the power grid is realized.
On one hand, the actual new energy, the stored energy and the flexible load show volatility and randomness in the operation process, and on the other hand, the actual new energy, the stored energy and the flexible load can also receive the active control instruction of the power grid. Therefore, the new energy, the stored energy and the flexible load have 2 curves, 1 is a basic power curve (obtained through new energy prediction, stored energy planning or load prediction), and the other is an actual power curve (artificially preset, disturbance meeting the fluctuation characteristics of the basic power curve and a power grid control target are superposed on the basic power curve). The basic power curve is stored by 1 point in 15 minutes, the total time is 1 day, and the total time is 96 points, the actual power curve is stored by one point in 15 minutes, the total time is 1 day, and the total time is 96 points, and the CIME file is adopted.
When the simulation cycle runs, the power at the moment t is calculated from an equivalent load power curve, a new energy source, an energy storage and flexible load base and an actual power curve by adopting a linear interpolation method according to the current time in the long-process simulation of the power grid.
At the time point when the basic power curve and the actual power curve have deviation, namely the time point when power fluctuation occurs or a control instruction is received, the deviation is superposed on the original equivalent load power curve, and the power value at the time t is equal to the sum of the equivalent load power curve power value and the deviation amount of the hooked multi-resource power:
in the formula: p(ld,t)The equivalent load power at the time t in the long-process closed-loop simulation of the power grid is obtained; pld (curve,t)The power at the moment t of the generated equivalent load power curve is obtained;
the baseline power of the new energy source, the stored energy or the flexible load at time t,
the actual power of the new energy, the stored energy or the flexible load at the moment t after the fluctuation or the receiving of the control instruction; and N is the total number of new energy, stored energy and flexible loads hung on the hanging points.
Obtaining equivalent load power P at multiple moments in long-process simulation(ld,t)And carrying out smooth connection to obtain a power grid long-process simulation power curve containing new energy, stored energy and flexible load.
Example 2
Referring to fig. 2, the present invention further provides a power grid long process simulation system including new energy, stored energy and flexible load according to the present invention, including:
the equivalent load processing module is used for hanging the new energy, the stored energy and the flexible load on a hanging point to perform equivalent load processing;
the power curve acquisition module is used for acquiring a first curve, a second curve and a third curve of the hanging point; the first curve is an equivalent load power curve of the hanging point; the second curve is a basic power curve of the new energy of the hanging point, the stored energy and the flexible load; the third curve is an actual power curve of new energy, stored energy and flexible load at the hanging point;
a simulation module used for calculating the equivalent load power P at the time t in the long-process closed-loop simulation of the hanging point power grid based on the first curve, the second curve and the third curve(ld,t)。
Example 3
Referring to fig. 3, the present invention further provides a power grid long process simulation system including new energy, stored energy and flexible load according to the present invention, the system includes: a processor and a memory coupled to the processor, the memory storing a computer program which, when executed by the processor, implements the method steps of the method for simulating a long process of a power grid with new energy, stored energy and flexible loads of embodiment 1.
In this embodiment, the method steps executed by the processor are the same as those in embodiment 1, and are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The method for simulating the long process of the power grid containing new energy, stored energy and flexible load is characterized by comprising the following steps:
1) hanging the new energy, the stored energy and the flexible load at a hanging point to perform equivalent load processing;
2) acquiring a first curve, a second curve and a third curve of a hanging point; the first curve is an equivalent load power curve of the hanging point; the second curve is a basic power curve of the new energy of the hanging point, the stored energy and the flexible load; the third curve is an actual power curve of new energy, stored energy and flexible load at the hanging point;
3) calculating equivalent load power P at the time t in the long-process closed-loop simulation of the hanging point power grid based on the first curve, the second curve and the third curve(ld,t)。
2. The method for long-process simulation of a power grid with new energy, stored energy and flexible loads according to claim 1, wherein the hanging node is on the 220kV side of the transformer.
3. The method for simulating the long process of the power grid with the new energy, the stored energy and the flexible load according to claim 1, wherein the first curve is generated by the generation load curve generation function of each region in the power grid.
4. The method for long-process simulation of a power grid with new energy, stored energy and flexible load according to claim 1, wherein the second curve is obtained by new energy prediction, stored energy planning or load prediction.
5. The method for simulating the long process of the power grid with the new energy, the stored energy and the flexible load according to claim 1, wherein the third curve is obtained by presetting power fluctuation meeting fluctuation characteristics and a power grid control target on the second curve.
6. The method for simulating the long process of the power grid with the new energy, the stored energy and the flexible load according to claim 1, wherein in the step 3), the equivalent load power P at the time t is calculated from the first curve, the second curve and the third curve by using a linear interpolation method(ld,t)。
7. The method for simulating the long process of the power grid with the new energy, the stored energy and the flexible load according to claim 1, wherein the equivalent load power P at the time t is(ld,t)The calculation formula of (a) is as follows:
in the formula: pld (curve,t)The power at the moment t of the generated equivalent load power curve is obtained;
the baseline power of the new energy source, the stored energy or the flexible load at time t,
the actual power of the new energy, the stored energy or the flexible load at the moment t after the fluctuation or the receiving of the control instruction; and N is the total number of new energy, stored energy and flexible loads hung on the hanging points.
8. The method for simulating the long process of the power grid with the new energy, the stored energy and the flexible load according to claim 1, wherein equivalent load power P at a plurality of moments is obtained in the long process simulation(ld,t)And carrying out smooth connection to obtain a power grid long-process simulation power curve containing new energy, stored energy and flexible load.
9. Long process simulation system of electric wire netting that contains new forms of energy, energy storage and flexible load, its characterized in that includes:
the equivalent load processing module is used for hanging the new energy, the stored energy and the flexible load on a hanging point to perform equivalent load processing;
the power curve acquisition module is used for acquiring a first curve, a second curve and a third curve of the hanging point; the first curve is an equivalent load power curve of the hanging point; the second curve is a basic power curve of the new energy of the hanging point, the stored energy and the flexible load; the third curve is an actual power curve of new energy, stored energy and flexible load at the hanging point;
a simulation module used for calculating the equivalent load power P at the time t in the long-process closed-loop simulation of the hanging point power grid based on the first curve, the second curve and the third curve(ld,t)。
10. Long process simulation system of electric wire netting that contains new forms of energy, energy storage and flexible load, its characterized in that includes: a processor and a memory coupled to the processor, the memory storing a computer program which, when executed by the processor, implements the method steps of the new energy, energy storage and flexible load containing grid long process simulation method of any of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767845A (en) * | 2018-04-27 | 2018-11-06 | 中国电力科学研究院有限公司 | A kind of flexible simulated method and system |
| US20180366952A1 (en) * | 2017-06-20 | 2018-12-20 | National Technology & Engineering Solutions Of Sandia, Llc | Nonlinear power flow control for networked AC/DC microgrids |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20180366952A1 (en) * | 2017-06-20 | 2018-12-20 | National Technology & Engineering Solutions Of Sandia, Llc | Nonlinear power flow control for networked AC/DC microgrids |
| CN108767845A (en) * | 2018-04-27 | 2018-11-06 | 中国电力科学研究院有限公司 | A kind of flexible simulated method and system |
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Application publication date: 20210122 |