CN112484920A - System and method for monitoring rotational inertia of power system - Google Patents
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Abstract
The invention discloses a system and a method for monitoring rotational inertia of a power system, and belongs to the technical field of power system operation control. The system of the invention comprises: the generator information real-time monitoring and processing module is used for generating a generator admittance matrix and a generator terminal voltage vector aiming at the operation information; the network information real-time monitoring and processing module generates a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix; the disturbance power distribution coefficient calculation module is used for determining a disturbance power distribution coefficient vector; and the equivalent rotational inertia calculation module is used for acquiring the equivalent rotational inertia of the node according to the disturbance power distribution coefficient vector. According to the invention, the system equivalent inertia moment aiming at each power disturbance node can be calculated through the disturbance power distribution coefficient based on the generator information and the network information in the system, and the method can be used for the operation control of the actual power grid and provides a more accurate monitoring effect for the frequency safety and stability characteristics of the system.
Description
Technical Field
The present invention relates to the field of power system operation control technology, and more particularly, to a monitoring system and method for power system rotational inertia.
Background
The energy crisis makes people pay more and more attention to research and utilization of new energy, and new energy power generation is a main way of utilizing new energy. The new energy power generation proportion of China is gradually increasing and will continue to increase. The large-scale new energy power generation replaces the traditional synchronous generator set, so that the rotational inertia of the system is reduced, the transient supporting capacity of the system to the frequency is weakened, and the frequency out-of-limit risk is increased. In addition, with the annual increase of the number and capacity of extra-high voltage direct current transmission projects, the main fault restricting the frequency stability of the power system becomes an extra-high voltage direct current blocking fault, and the system frequency stability level mainly depends on the equivalent moment of inertia of the system: the larger the equivalent moment of inertia, the higher the system frequency stability level.
In order to improve the safe and stable operation level of the system and perform risk early warning and operation guidance on the system, it is necessary to monitor the equivalent rotational inertia of the system. With the replacement of the traditional synchronous generator set by new energy and the adoption of virtual synchronous control by the new energy generator set to provide inertia support for the system, the uneven distribution characteristic of the rotational inertia in the system is more and more obvious, so that the traditional rotational inertia monitoring system adopting a simple addition mode has extremely large error and cannot meet the system operation requirement, and a system rotational inertia monitoring system considering the distribution characteristic does not exist in China at present.
Disclosure of Invention
In view of the above problem, the present invention provides a monitoring system for rotational inertia of an electric power system, including:
the system comprises a generator information real-time monitoring and processing module, a generator information real-time monitoring and processing module and a generator end voltage vector generation module, wherein the generator information real-time monitoring and processing module monitors operation information of a generator set of a power system and generates a generator admittance matrix and a generator end voltage vector aiming at the operation information;
the network information real-time monitoring and processing module acquires monitoring information and generates a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
the disturbance power distribution coefficient calculation module determines a disturbance injection node set of the power system, determines a disturbance current vector aiming at a node in the disturbance injection node set, and determines a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and the equivalent rotational inertia calculation module is used for acquiring the equivalent rotational inertia of the nodes according to the disturbance power distribution coefficient vector aiming at the nodes in the disturbance injection node set, so that the monitoring of the rotational inertia of the power system is completed.
Optionally, the obtaining of the equivalent moment of inertia of the node includes obtaining a minimum equivalent moment of inertia of the node and a region equivalent moment of inertia of the node.
Optionally, the operation information includes: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
Optionally, the monitoring information includes: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
The invention also provides a monitoring method for the rotational inertia of the power system, which comprises the following steps:
monitoring operation information of a generator set of the power system, and generating a generator admittance matrix and a generator terminal voltage vector aiming at the operation information;
acquiring monitoring information, and generating a modified node admittance matrix, a modified load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
determining a disturbance injection node set of the power system, determining a disturbance current vector aiming at nodes in the disturbance injection node set, and determining a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and aiming at the nodes in the disturbance injection node set, obtaining the equivalent moment of inertia of the nodes according to the disturbance power distribution coefficient vector, namely completing the monitoring of the moment of inertia of the power system.
Optionally, the obtaining of the equivalent moment of inertia of the node includes obtaining a minimum equivalent moment of inertia of the node and a region equivalent moment of inertia of the node.
Optionally, the operation information includes: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
Optionally, the monitoring information includes: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
The invention can calculate the system equivalent inertia moment aiming at each power disturbance node through the disturbance power distribution coefficient based on the generator information and the network information in the system, can be used for the operation control of the actual power grid, provides more accurate monitoring effect for the frequency safety and stability characteristics of the system, is simple and easy to operate, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
Drawings
FIG. 1 is a block diagram of a monitoring system for rotational inertia of an electrical power system in accordance with the present invention;
fig. 2 is a flowchart of a method for monitoring rotational inertia of a power system according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
In view of the above problem, the present invention provides a monitoring system for rotational inertia of a power system, as shown in fig. 1, including:
the system comprises a generator information real-time monitoring and processing module, a generator information real-time monitoring and processing module and a generator end voltage vector generation module, wherein the generator information real-time monitoring and processing module monitors operation information of a generator set of a power system and generates a generator admittance matrix and a generator end voltage vector aiming at the operation information;
the network information real-time monitoring and processing module acquires monitoring information and generates a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
the disturbance power distribution coefficient calculation module determines a disturbance injection node set of the power system, determines a disturbance current vector aiming at a node in the disturbance injection node set, and determines a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and the equivalent rotational inertia calculation module is used for acquiring the equivalent rotational inertia of the nodes according to the disturbance power distribution coefficient vector aiming at the nodes in the disturbance injection node set, so that the monitoring of the rotational inertia of the power system is completed.
And acquiring the equivalent rotational inertia of the node, wherein the acquiring includes acquiring the minimum equivalent inertia of the node and the area equivalent rotational inertia of the node.
Run information, including: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
Monitoring information, including: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
The invention is further illustrated by the following examples:
the system of the invention comprises:
generator information real-time monitoring and processing module, mainly used:
a. monitoring generator information:
monitoring the rotational inertia J of all generator setsiSub-transient reactance x'di(including adopting the new energy generating set of the synchronous control, also monitor its fictitious inertia of rotation and equivalent time transient state reactance), generator terminal voltage UgiWherein i is 1,2 … g, and g is the total number of generators in the system;
b. generator information processing;
forming generator admittance matrix YgenAnd terminal voltage vector UgenThe formula is as follows:
Ugen＝[Ug1 Ug2…Ugg]1×n
the network information real-time monitoring and processing module is mainly used for:
the monitoring information comprises a node network incidence matrix A and a node admittance matrix YnetNode voltage UiActive power PiReactive power QiWhere i is 1,2 … n, n is the number of nodes in the system.
The following information is calculated:
a. revised node admittance matrix Ynet’：
b. Load admittance matrix YLPQ：
c. Generator-node association admittance matrix Ygn：
Ygn＝Ygen·A
Wherein,
and the disturbance power distribution coefficient calculation module is mainly used for:
determining a concerned disturbance injection node set D, calculating a disturbance power distribution coefficient for all nodes in the set D, taking a node j as an example, giving a disturbance power delta P injected at the node j, and calculating to obtain the following information:
a. disturbance current vector Δ In：
b. Disturbance power distribution coefficient vector KPDF：
And the equivalent moment of inertia calculation module is mainly used for:
for the nodes in the set D, the equivalent moment of inertia calculation comprises two parts, namely the minimum equivalent moment of inertia Jeq-minAnd area equivalent moment of inertia Jeq-zoneAnd calculating the equivalent moment of inertia of all the nodes in the set D.
a. A minimum equivalent moment of inertia;
the minimum equivalent moment of inertia is the system equivalent moment of inertia corresponding to the maximum frequency change rate of each node in the system after disturbance power is injected at a given node j, and the minimum equivalent moment of inertia represents the weakest link of the disturbance power injected at the given node j, and the calculation formula is as follows:
wherein i is 1,2, … KPDFiIs KPDFThe ith element in (1) is a disturbance power distribution coefficient of the ith generator.
b. The area equivalent moment of inertia;
the area equivalent rotational inertia is equivalent rotational inertia corresponding to the integral frequency change rate of a given area Z in a system after disturbance power is injected at a given node j, and is characterized by the inertia of the given area when the disturbance power is injected at the given node j, and the calculation formula is as follows:
the invention also provides a monitoring method for the rotational inertia of the power system, as shown in fig. 2, including:
monitoring operation information of a generator set of the power system, and generating a generator admittance matrix and a generator terminal voltage vector aiming at the operation information;
acquiring monitoring information, and generating a modified node admittance matrix, a modified load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
determining a disturbance injection node set of the power system, determining a disturbance current vector aiming at nodes in the disturbance injection node set, and determining a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and aiming at the nodes in the disturbance injection node set, obtaining the equivalent moment of inertia of the nodes according to the disturbance power distribution coefficient vector, namely completing the monitoring of the moment of inertia of the power system.
And acquiring the equivalent rotational inertia of the node, wherein the acquiring includes acquiring the minimum equivalent inertia of the node and the area equivalent rotational inertia of the node.
Run information, including: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
Monitoring information, including: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
The invention can calculate the system equivalent inertia moment aiming at each power disturbance node through the disturbance power distribution coefficient based on the generator information and the network information in the system, can be used for the operation control of the actual power grid, provides more accurate monitoring effect for the frequency safety and stability characteristics of the system, is simple and easy to operate, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
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 scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
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.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. A monitoring system for rotational inertia of a power system, the system comprising:
the system comprises a generator information real-time monitoring and processing module, a generator information real-time monitoring and processing module and a generator end voltage vector generation module, wherein the generator information real-time monitoring and processing module monitors operation information of a generator set of a power system and generates a generator admittance matrix and a generator end voltage vector aiming at the operation information;
the network information real-time monitoring and processing module acquires monitoring information and generates a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
the disturbance power distribution coefficient calculation module determines a disturbance injection node set of the power system, determines a disturbance current vector aiming at a node in the disturbance injection node set, and determines a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and the equivalent rotational inertia calculation module is used for acquiring the equivalent rotational inertia of the nodes according to the disturbance power distribution coefficient vector aiming at the nodes in the disturbance injection node set, so that the monitoring of the rotational inertia of the power system is completed.
2. The system of claim 1, the equivalent moment of inertia of the acquisition node comprising a minimum equivalent moment of inertia of the acquisition node and a regional equivalent moment of inertia of the node.
3. The system of claim 1, the operational information comprising: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
4. The system of claim 1, the monitoring information, comprising: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
5. A method for monitoring rotational inertia of a power system, the system comprising:
monitoring operation information of a generator set of the power system, and generating a generator admittance matrix and a generator terminal voltage vector aiming at the operation information;
acquiring monitoring information, and generating a modified node admittance matrix, a modified load admittance matrix and a generator-node association admittance matrix according to the monitoring information and the generator admittance matrix;
determining a disturbance injection node set of the power system, determining a disturbance current vector aiming at nodes in the disturbance injection node set, and determining a disturbance power distribution coefficient vector according to the disturbance current vector, a terminal voltage vector, a modified node admittance matrix, a load admittance matrix and a generator-node association admittance matrix;
and aiming at the nodes in the disturbance injection node set, obtaining the equivalent moment of inertia of the nodes according to the disturbance power distribution coefficient vector, namely completing the monitoring of the moment of inertia of the power system.
6. The method of claim 5, wherein the obtaining the equivalent moment of inertia of the node comprises obtaining a minimum equivalent moment of inertia of the node and a regional equivalent moment of inertia of the node.
7. The method of claim 5, the operational information, comprising: the rotational inertia of the generator set, the sub-transient reactance of the power system and the generator terminal voltage.
8. The method of claim 5, the monitoring information, comprising: the network incidence matrix of the nodes, the node admittance matrix, the node voltages, the active power of the nodes and the reactive power of the nodes.
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