CN110766283B - Power grid dispatching system and power grid dispatching method - Google Patents
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Abstract
The invention relates to the field of power dispatching, and provides a power grid dispatching system and a power grid dispatching method. The power grid dispatching system comprises a power grid coordination dispatching system and at least one energy management system which are connected with each other, wherein: the energy management system is configured to determine the external characteristic data of the whole power plant of the power plant and transmit the external characteristic data of the whole power plant to the power grid coordination scheduling system; the power grid coordination scheduling system is configured to optimize the generating power of a generating set of the power plant where the energy management system is located according to the overall external characteristic data of the power plant, and feed back a scheduling result to the energy management system; the energy management system is further configured to operate the power plant in an optimal manner based on the scheduling results. The invention can at least maximize the overall operating efficiency of the power grid.
Description
Technical Field
The invention relates to the field of power dispatching, in particular to a power grid dispatching system and a power grid dispatching method.
Background
For a power grid comprising a cogeneration unit and a renewable energy generator unit such as wind power and photovoltaic power, increasing the overall flexibility of the power grid and improving the overall operation efficiency of the power grid are two main development directions at present. Therefore, various thermal power plants develop different forms of heat supply mode transformation on the coal, gas and oil cogeneration units in the district, such as high back pressure transformation and bypass steam extraction transformation on the extraction condensing cogeneration units, and installation of absorption heat pumps, electric heating devices, heat storage devices and the like.
After the heat supply mode is improved, each unit and other heat supply equipment have different operating efficiency and adjusting capacity. For example, the unit after high back pressure transformation has high operation efficiency but low regulation capacity; the electric heating device has high regulation capacity but low operation efficiency. Meanwhile, the structure of a heating system in the power plant is changed, so that the coupling constraint relationship between each unit and other heating equipment in the same power plant is more complicated.
The existing power grid dispatching system cannot consider the coupling constraint relation between each unit and other heating equipment in the same power plant, is difficult to make full use of the flexibility of each unit and other heating equipment, and is not beneficial to maximizing the overall operation efficiency of a power grid.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a power grid dispatching system and a power grid dispatching method so as to at least maximize the overall operation efficiency of a power grid.
According to an aspect of the present invention, there is provided a grid dispatching system comprising a grid coordination dispatching system and at least one energy management system connected to each other, wherein: the energy management system is configured to determine the external characteristic data of the power plant and transmit the external characteristic data of the power plant to the power grid coordination scheduling system; the power grid coordination scheduling system is configured to optimize the generating power of a generating set of the power plant where the energy management system is located according to the external characteristic data of the power plant, and feed back a scheduling result to the energy management system; the energy management system is further configured to operate the power plant in an optimal manner based on the scheduling results.
According to an embodiment of the invention, the energy management system is further configured to: collecting operating parameters of one or more generator sets and other heating equipment in the power plant to determine overall external characteristic data of the power plant reflecting coupling relations between the generator sets and the other heating equipment.
According to an embodiment of the invention, the energy management system is further configured to: and according to the scheduling result, coordinating the operation parameters of one or more generator sets and other heating equipment in the power plant so as to enable the power plant to operate in an optimal mode.
According to the embodiment of the invention, the power grid dispatching system comprises a plurality of energy management systems, wherein the energy management systems are respectively connected with the power grid coordination dispatching system.
According to an embodiment of the invention, the generator set comprises: one or more of an extraction condensing type thermoelectric unit, a back pressure type thermoelectric unit, an extraction condensing type thermoelectric unit after low-pressure cylinder near-zero output transformation, and an extraction condensing type or back pressure type thermoelectric unit after bypass extraction transformation; the other heating apparatus includes: one or more of an electric heat pump, an absorption heat pump, an electric heating device, and a heat storage device; the operating parameters include: one or more of temperature, pressure, flow, valve opening, and liquid level at key nodes of the system.
According to an embodiment of the invention, the plant global external characteristic data comprises: one or more of an upper limit and a lower limit of the overall generated power of the power plant, and a functional relationship between the overall operating efficiency of the power plant and the overall generated power.
According to an embodiment of the invention, the energy management system is further configured to: determining the operation feasibility of the power plant under different power generation and heat supply loads; determining the optimal operation mode and the corresponding overall operation efficiency of the power plant under different power generation and heat supply loads based on an operation parameter optimization algorithm so as to determine the overall external characteristic data of the power plant; and coordinating the operation parameters of one or more generator sets and other heating equipment in the power plant to maximize the operation efficiency of the power plant, wherein the operation parameter optimizing algorithm comprises a heuristic algorithm, and the heuristic algorithm comprises a genetic algorithm, a simulated annealing algorithm or a sequential quadratic programming algorithm.
According to an embodiment of the invention, the grid coordination scheduling system is further configured to: on the basis of a power grid scheduling algorithm, under the condition of meeting the overall power balance and power flow constraint of a power grid and the operation feasibility of a power plant, the overall power generation power of the power plant where each energy management system is located is calculated by taking the maximum overall operation efficiency of the power grid as an optimization target, wherein the power grid scheduling algorithm comprises a Lagrange relaxation method, a mixed integer programming method, a genetic algorithm or a particle swarm optimization algorithm.
According to another aspect of the present invention, there is provided a power grid dispatching method, including: determining integral external characteristic data of a power plant of the power plant through an energy management system, and transmitting the integral external characteristic data of the power plant to a power grid coordination scheduling system; according to the external characteristic data of the whole power plant, optimizing the generating power of a generating set of the power plant where the energy management system is located through the power grid coordination scheduling system, and feeding back a scheduling result to the energy management system; and according to the scheduling result, the power plant is operated in an optimal mode through the energy management system.
According to the embodiment of the invention, the power grid dispatching method further comprises the following steps: collecting, by the energy management system, operating parameters of one or more generator sets and other heating equipment in the power plant to determine external characteristic data of the power plant that reflects a coupling relationship between the generator sets and the other heating equipment; and according to the scheduling result, coordinating the operation parameters of one or more generator sets and other heating equipment in the power plant through the energy management system so as to enable the power plant to operate in an optimal mode.
The invention has the beneficial effects that:
in the power grid dispatching system and the power grid dispatching method provided by the invention, the energy management system in the power plant can determine the external characteristic data of the whole power plant of the power plant, and transmit the external characteristic data of the whole power plant to the power grid coordination dispatching system. Furthermore, the power grid coordination scheduling system can optimize the generating power of a generating set of the power plant where the energy management system is located according to the external characteristic data of the whole power plant, and feeds back the scheduling result to the energy management system; the energy management system may then proceed to operate the power plant in an optimal manner based on the scheduling results. Therefore, the overall operation efficiency of the power grid can be maximized through the coordination action of the power grid coordination scheduling system and the energy management system.
Furthermore, the external characteristic data of the whole power plant reflecting the coupling relation between the generator sets and other heat supply equipment is obtained by collecting the operating parameters of the generator sets and the heat supply equipment in the power plant and analyzing, so that the generating power of the generator sets in the power grid can be optimized and scheduled, the flexibility of the generator sets and the heat supply equipment is fully utilized, and the overall operating efficiency of the power grid is further maximized on the premise of meeting the flexibility requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power grid dispatching system according to an embodiment of the invention.
Fig. 2 is a flowchart of a power grid dispatching method according to an embodiment of the invention.
Reference numerals:
1: an energy management system; 2: a power grid coordination scheduling system; 3: a thermal power plant; 4: a generator set; 5: a heating device; 100: a power grid dispatching method; 102. 104, 106: and (4) carrying out various steps.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, unless otherwise specified, "plurality", "plural groups" means two or more, and "several", "several groups" means one or more.
Referring to the embodiments shown in fig. 1 and fig. 2, exemplary embodiments of the power grid dispatching system and the power grid dispatching method provided by the invention are described in detail.
As shown in fig. 1, a schematic structural diagram of a power grid dispatching system according to an embodiment of the invention is shown. Specifically, the grid dispatching system generally includes at least one energy management system 1 and a grid coordination dispatching system 2 connected to each other. In the embodiment shown in fig. 1, a power plant is described as a thermal power plant, and the energy management system 1 is also referred to as a plant-level integrated energy management system. In alternative embodiments, the power plant may also include a wind power plant or a photovoltaic power plant, etc.; that is, the kind of the power plant is not limited to the present invention. In addition, the system and method of the present invention may be applied to a single kind of power plant (e.g., including multiple thermal power plants) or to multiple kinds of power plants (e.g., including a combination of thermal power plants, wind power plants, and photovoltaic power plants), as the case may be, without departing from the scope of the present invention.
Further, as shown in fig. 1, the energy management system 1 may be disposed in each thermal power plant 3, for example, and the grid coordination scheduling system 2 may be connected to a plurality of energy management systems 1. That is, the grid dispatching system may include a plurality of energy management systems 1, and the plurality of energy management systems 1 are respectively connected to the grid coordination dispatching system 2. It should be understood, however, that the number of energy management systems 1 and the number of corresponding power plants are not limited to a particular number, but may be case-specific, and thus the present invention is not limited thereto.
With continued reference to FIG. 1, in one embodiment, the energy management system 1 may be configured to determine plant wide external characteristic data for the located plant and transmit the plant wide external characteristic data to the grid coordination scheduling system 2. And the power grid coordination scheduling system 2 may be configured to optimize the generated power of the generator set of the power plant where the energy management system 1 is located according to the external characteristic data of the whole power plant, and feed back the scheduling result to the energy management system 1. Further, the energy management system 1 may be configured to operate the power plant in an optimal manner according to the feedback scheduling result.
Therefore, the overall operation efficiency of the power grid can be maximized through the coordination of the power grid coordination scheduling system 2 and the energy management system 1.
Further, in an embodiment of the present invention, the energy management system 1 may be further configured to: operating parameters of one or more generator sets 4 and other heating equipment 5 within the plant are collected to determine the above-described overall plant external characteristic data reflecting the coupling relationship between the generator sets 4 and other heating equipment 5. Additionally, in one embodiment, the energy management system 1 may be further configured to: and according to the feedback scheduling result, coordinating the operation parameters of one or more generator sets 4 and other heating equipment 5 in the power plant so as to enable the power plant to operate in an optimal mode.
Therefore, the external characteristic data of the whole power plant reflecting the coupling relation between the generator set 4 and the other heat supply equipment 5 is obtained by collecting the operating parameters of each generator set 4 and each heat supply equipment 5 in the power plant and analyzing, so that the generating power of each generator set in the power grid can be optimized and scheduled, the flexibility of each generator set and each heat supply equipment is fully utilized, and the overall operating efficiency of the power grid is further maximized on the premise of meeting the flexibility requirement.
In an alternative embodiment, the generator set 4 as described above may for example comprise: the low-pressure cylinder is close to zero and goes out of the work and reform transform the condensing thermoelectric unit, back pressure thermoelectric unit, low-pressure cylinder, the condensing or back pressure thermoelectric unit of condensing or back pressure thermoelectric unit after the bypass steam extraction reforms transform one or more.
In another alternative embodiment, the other heating apparatuses 5 may for example comprise: one or more of an electric heat pump, an absorption heat pump, an electric heating device, and a heat storage device.
In other alternative embodiments, the above-mentioned operating parameters may include, for example: one or more of temperature, pressure, flow, valve opening, and liquid level at key nodes of the system.
In further alternative embodiments, the plant global external characteristic data may include, for example: one or more of an upper limit and a lower limit of the overall generated power of the power plant, and a functional relationship between the overall operating efficiency of the power plant and the overall generated power.
It should be understood here that the above described choices of the generator set 4, the other heating equipment 5, the operating parameters and the plant overall external characteristic data are only illustrative and may also include other options not shown in the embodiments of the invention but still suitable for the application of the invention. In other words, the invention is not limited to any particular choice or number of choices.
Further, in one embodiment, the energy management system 1 may also be configured to: determining the operation feasibility of the power plant under different power generation and heat supply loads; determining the optimal operation mode and the corresponding overall operation efficiency of the power plant under different power generation and heat supply loads based on an operation parameter optimization algorithm so as to determine the overall external characteristic data of the power plant; and coordinating operating parameters of one or more generator sets 4 and other heating equipment 5 within the site to maximize the site's operating efficiency.
In an alternative embodiment, the operating parameter optimization algorithm as described above may, for example, comprise a heuristic algorithm. Further optionally, the heuristic algorithm may comprise, for example, a genetic algorithm, a simulated annealing algorithm, or a sequence quadratic programming algorithm.
On the other hand, in one embodiment, the grid coordination scheduling system 2 may be further configured to: based on a power grid scheduling algorithm, under the condition of meeting the overall power balance and the power flow constraint of a power grid and the operation feasibility of a power plant, the overall power generation power of the power plant where each energy management system 1 is located is calculated by taking the maximum overall operation efficiency of the power grid as an optimization target.
In alternative embodiments, the grid scheduling algorithm as described above may for example comprise a lagrangian relaxation method, a mixed integer programming method, a genetic algorithm or a particle swarm optimization algorithm.
It should be understood that the above-described operating parameter optimization algorithm and grid dispatching algorithm are also merely exemplary, and are not intended to limit the present invention in any way. Other embodiments of the invention may choose other corresponding applicable methods according to the circumstances without departing from the scope of the invention.
On the other hand, as shown in fig. 2, an embodiment of the present invention further provides a power grid dispatching method 100. Specifically, the power grid dispatching method 100 may include the following steps:
first, at step 102, the external characteristic data of the power plant of the located power plant is determined by the energy management system 1, and the external characteristic data of the power plant is transmitted to the grid coordination scheduling system 2.
Then, at step 104, according to the external characteristic data of the power plant, the power generation power of the generator set of the power plant where the energy management system 1 is located is optimized through the power grid coordination scheduling system 2, and the scheduling result is fed back to the energy management system 1.
Next, at step 106, the plant is operated in an optimal manner by the energy management system 1 according to the scheduling results as described above.
Further, in an embodiment, the power grid dispatching method may further include the steps of:
collecting operation parameters of one or more generator sets 4 and other heating equipment 5 in the power plant through the energy management system 1 to determine external characteristic data of the power plant reflecting the coupling relation between the generator sets 4 and the other heating equipment 5; and
according to the scheduling result, the operation parameters of one or more generator sets 4 and other heating equipment 5 in the power plant are coordinated through the energy management system 1 so that the power plant operates in an optimal manner.
Therefore, in the power grid scheduling method 100 provided in the embodiment of the present invention, the external characteristic data of the whole power plant reflecting the coupling relationship between the generator set 4 and the other heat supply equipment 5 is obtained by collecting the operating parameters of each generator set 4 and each heat supply equipment 5 in the power plant and analyzing the operating parameters, so that the power generation power of each generator set in the power grid can be optimally scheduled, the flexibility of each generator set and each heat supply equipment is fully utilized, and the overall operating efficiency of the power grid is further maximized on the premise of meeting the flexibility requirement.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A grid dispatching system, comprising a grid coordination dispatching system and at least one energy management system connected to each other, wherein:
the energy management system is configured to collect power generation and heat supply operation parameters of one or more power generating sets and other heat supply equipment in the power plant, determine external characteristic data of the power plant, which reflect the coupling relation between the power generating sets and the other heat supply equipment, and transmit the external characteristic data of the power plant to the power grid coordination scheduling system, wherein the external characteristic data of the power plant comprises: one or more of the upper limit and the lower limit of the overall generated power of the power plant and the functional relationship between the overall operating efficiency of the power plant and the overall generated power;
the power grid coordination scheduling system is configured to determine the generating power of a generating set of the power plant where the energy management system is located according to the external characteristic data of the power plant, with the aim of maximizing the overall operation efficiency of the power grid, and feed back a scheduling result to the energy management system;
the energy management system is further configured to coordinate operation parameters of one or more generator sets and other heat supply equipment in the power plant according to the scheduling result, so that the power plant can maximize the operation efficiency on the premise of meeting the power grid regulation requirement.
2. The grid dispatching system of claim 1, comprising a plurality of the energy management systems, wherein the plurality of energy management systems are respectively connected to the grid coordination dispatching system.
3. The grid dispatching system of claim 1,
the generator set comprises: one or more of an extraction condensing type thermoelectric unit, a back pressure type thermoelectric unit, an extraction condensing type thermoelectric unit after low-pressure cylinder near-zero output transformation, and an extraction condensing type or back pressure type thermoelectric unit after bypass extraction transformation;
the other heating apparatus includes: one or more of an electric heat pump, an absorption heat pump, an electric heating device, and a heat storage device;
the operating parameters include: one or more of temperature, pressure, flow, valve opening, and liquid level at key nodes of the system.
4. The power grid dispatching system of claim 1, wherein the energy management system is further configured to:
determining the operation feasibility of the power plant under different power generation and heat supply loads;
determining the optimal operation mode and the corresponding overall operation efficiency of the power plant under different power generation and heat supply loads based on an operation parameter optimization algorithm so as to determine the overall external characteristic data of the power plant;
coordinating operating parameters of one or more power generating units and other heat supplying equipment within the site to maximize the site operating efficiency,
the operation parameter optimizing algorithm comprises a heuristic algorithm, wherein the heuristic algorithm comprises a genetic algorithm, a simulated annealing algorithm or a sequence quadratic programming algorithm.
5. The power grid dispatching system of claim 1, wherein the power grid coordination dispatching system is further configured to: based on a power grid scheduling algorithm, under the condition of meeting the overall power balance and the power flow constraint of a power grid and the operation feasibility of a power plant, the overall power generation power of the power plant where each energy management system is located is calculated by taking the overall operation efficiency of the power grid as an optimization target,
the power grid scheduling algorithm comprises a Lagrange relaxation method, a mixed integer programming method, a genetic algorithm or a particle swarm optimization algorithm.
6. A power grid dispatching method is characterized by comprising the following steps:
the method comprises the steps of collecting power generation and heat supply operation parameters of one or more generator sets and other heat supply equipment in a power plant through an energy management system, determining external characteristic data of the power plant, which reflect the coupling relation between the generator sets and the other heat supply equipment, of the power plant, and transmitting the external characteristic data of the power plant to a power grid coordination scheduling system, wherein the external characteristic data of the power plant comprises the following steps: one or more of the upper limit and the lower limit of the overall generated power of the power plant and the functional relationship between the overall operating efficiency of the power plant and the overall generated power;
according to the external characteristic data of the power plant, with the aim of maximizing the overall operation efficiency of a power grid, determining the generating power of a generating set of the power plant where the energy management system is located through the power grid coordination scheduling system, and feeding back a scheduling result to the energy management system;
and according to the scheduling result, coordinating the operation parameters of one or more generator sets and other heat supply equipment in the power plant through the energy management system so as to maximize the operation efficiency of the power plant on the premise of meeting the power grid regulation requirement.
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| 基于自适应系统优化算法的机组组合;张晓花等;《电力自动化设备》;20091031;第29卷(第10期);93-97 * |
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