A transient power angle stability control system and control method for a power system

Abstract

The application discloses a transient power angle stability control system and method of a power system, which comprises a power type energy storage device and / or a hydrogen fuel power generation device; the power type energy storage device is arranged at a first preset position in the power system to absorb electric energy when the power system is cleared from failure; and / or the hydrogen fuel power generation device is arranged at a second preset position in the power system to release electric energy when the power system is cleared from failure, so as to realize transient power angle stability control of the power system. That is, the application can realize transient power angle stability control of the power system by means of the power type energy storage device and / or the hydrogen fuel power generation device, effectively avoid transient power angle instability of the power system, solve the problem that power angle instability of a generator set in the existing power system causes large-area power failure and seriously affects production and life of users, and fill the blank that hydrogen energy storage cannot be applied to research on transient power angle stability control of the power system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power stability control, in particular to a transient power angle stability control system and method for a power system. BACKGROUND

[0002] The stability problem is a very complex problem in a power system. Nowadays, due to the historical trend of large system interconnection in the development of the power industry, and the repeated occurrence of large system stability destruction accidents, the stability problem has become a focus problem that attracts much attention.

[0003] According to different research points, the stability problem can be generally classified into voltage stability and power angle stability. Among them, the power angle instability is fundamentally caused by the imbalance between the input and output power of the generator set in the power system. If the power angle instability occurs in part of the generator set in the power system, it will also cause the rotor of other units to lose synchronization and destroy the stable operation of the system, and long-term power angle instability will cause the protection of the power grid to malfunction, causing a large area power outage, which seriously affects the production and life of users. SUMMARY

[0004] Based on the deficiencies of the prior art, the present application provides a transient power angle stability control system and method for a power system to solve the problem that the power angle instability of the generator set in the existing power system will cause the protection of the power grid to malfunction, causing a large area power outage, which seriously affects the production and life of users.

[0005] In order to achieve the above purpose, the present application provides the following technical solutions:

[0006] The first aspect of the present application provides a transient power angle stability control system for a power system, comprising: a power type energy storage device and / or a hydrogen fuel power generation device;

[0007] The power type energy storage device is installed at a first preset position in the power system to absorb electrical energy when the power system is cleared of faults;

[0008] And / or, the hydrogen fuel power generation device is installed at a second preset position in the power system to release electrical energy when the power system is cleared of faults, so as to realize the transient power angle stability control of the power system.

[0009] Optionally, in the above-mentioned transient power angle stability control system for a power system, the first preset position is a first generator set in the power system, and the second preset position is a second generator set in the power system;

[0010] The number of the first generator set and the second generator set is at least one, the first generator set is a generator set with a comprehensive participation factor greater than a first preset value, the second generator set is a generator set with a comprehensive participation factor less than a second preset value, the first preset value is greater than 0, and the second preset value is less than 0.

[0011] Optionally, in the transient power angle stability control system of the power system, the determination process of the comprehensive participation factor of the generator set comprises:

[0012] determining a transient power angle instability fault set of the power system; the transient power angle instability fault set comprises a plurality of transient power angle instability faults;

[0013] calculating the participation factor of each generator set in each transient power angle instability fault in the power system;

[0014] for each generator set, calculating the comprehensive participation factor of each generator set in the power system according to the participation factor of the generator set in each transient power angle instability fault and the fault risk corresponding to the transient power angle instability fault.

[0015] Optionally, in the transient power angle stability control system of the power system, determining the transient power angle instability fault set of the power system comprises:

[0016] respectively simulating each expected fault in the power system to obtain the dominant mode identification result of each expected fault;

[0017] based on the dominant mode identification result of each expected fault, obtaining the transient power angle instability fault set: for each expected fault with the same dominant mode identification result, selecting one of the expected faults into the transient power angle instability fault set; for each expected fault with different dominant mode identification results, directly including each expected fault into the transient power angle instability fault set.

[0018] Optionally, in the transient power angle stability control system of the power system, calculating the participation factor of each generator set in each transient power angle instability fault in the power system comprises:

[0019] determining the group attribute of each generator set in each transient power angle instability fault in the power system; the group attribute comprises a leading group and a remaining group;

[0020] calculating the participation factor of each generator set in each transient power angle instability fault according to the group attribute of the generator set in each transient power angle instability fault;

[0021] If the group attribute of the generator set in the transient power angle instability fault is the leading group, the maximum acceleration kinetic energy of each generator set in the leading group when the equivalent disturbed trajectory passes through a dynamic saddle point (DSP) is taken as a reference value, and a ratio of the acceleration kinetic energy of the generator set itself when the equivalent disturbed trajectory passes through the DSP to the reference value is taken as the participation factor of the generator set.

[0022] If the group attribute of the generator set in the transient power angle instability fault is the remaining group, the maximum acceleration kinetic energy of each generator set in the leading group when the equivalent disturbed trajectory passes through the DSP is also taken as the reference value, and an inverse of a ratio of the deceleration kinetic energy of the generator set itself when the equivalent disturbed trajectory passes through the DSP to the reference value is taken as the participation factor of the generator set.

[0023] Optionally, in the transient power angle stability control system of the power system, for each generator set, a comprehensive participation factor of each generator set in the power system is obtained by calculating a participation factor of the generator set in each transient power angle instability fault and a fault risk corresponding to the transient power angle instability fault, including:

[0024] The product of the participation factor of each generator set in each transient power angle instability fault and the fault risk corresponding to the transient power angle instability fault is calculated respectively;

[0025] For each generator set, the product of the participation factor of the generator set in each transient power angle instability fault and the fault risk corresponding to the transient power angle instability fault is accumulated to obtain the comprehensive participation factor of each generator set.

[0026] Optionally, in the transient power angle stability control system of the power system, the fault risk of the transient power angle instability fault is obtained by calculating an occurrence probability and a control cost of the transient power angle instability fault.

[0027] Optionally, in the transient power angle stability control system of the power system, the system further comprises a hydrogen production device installed at a preselected installation node in the power system, and the hydrogen production device is configured to provide power generation fuel for the hydrogen fuel power generation device.

[0028] Optionally, in the transient power angle stability control system of the power system, the hydrogen fuel power generation device comprises a hydrogen storage device and a hydrogen fuel cell.

[0029] The hydrogen storage device is configured to store hydrogen produced by the hydrogen production device, and the hydrogen fuel cell is configured to generate power by taking hydrogen from the hydrogen storage device.

[0030] Optionally, in the aforementioned transient power angle stability control system for the power system, the selection process for the pre-selected installation node includes:

[0031] A topology analysis is performed on the power network of the power system to obtain the current and voltage data of each node in the power network;

[0032] From the current and voltage data of each node in the power network, the node with the smallest current and voltage fluctuation is selected as the pre-selected installation node.

[0033] Optionally, in the aforementioned transient power angle stability control system for the power system, the selection process for the pre-selected installation node includes:

[0034] Identify the ordinary nodes and special nodes of the power network in the power system; the ordinary nodes are all other nodes in the power network besides the special nodes.

[0035] Calculate the electrical distance between each of the ordinary nodes and each of the special nodes respectively;

[0036] From all the ordinary nodes, select those ordinary nodes with the largest electrical distance from each of the special nodes as the pre-selected installation nodes.

[0037] Optionally, in the aforementioned transient power angle stability control system of the power system, the ordinary nodes and special nodes of the power network in the power system are determined as follows:

[0038] Obtain the annual number of disturbances for each node in the power network;

[0039] The nodes that are disturbed more than a preset number of times per year and the new energy nodes are respectively designated as special nodes, and the remaining nodes are designated as ordinary nodes.

[0040] Optionally, in the transient power angle stability control system of the above-mentioned power system, the electrical distance between each of the ordinary nodes and each of the special nodes is calculated, including:

[0041] Calculate the node admittance matrix of the power network;

[0042] The node impedance matrix of the power network is obtained by inverting the node admittance matrix.

[0043] Based on the node impedance matrix, the electrical distance between each of the ordinary nodes and each of the special nodes is obtained.

[0044] A second aspect of this application provides a transient power angle stability control method for a power system, applied to a transient power angle stability control system for a power system as disclosed in any of the claims of the first aspect, the method comprising:

[0045] determining whether the fault in the power system is cleared in real time;

[0046] if it is determined that the fault in the power system is cleared, controlling the hydrogen fuel power generation device in the transient power angle stability control system to release electric energy and / or the power-type energy storage device to absorb electric energy.

[0047] The application provides a transient power angle stability control system of a power system, comprising: a power-type energy storage device and / or a hydrogen fuel power generation device; the power-type energy storage device is arranged at a first preset position in the power system to absorb electric energy when the power system is cleared of a fault; and / or the hydrogen fuel power generation device is arranged at a second preset position in the power system to release electric energy when the power system is cleared of a fault, so as to realize transient power angle stability control of the power system, that is, the application can make the power-type energy storage device and / or the hydrogen fuel power generation device participate in the transient power angle stability control of the power system by reasonably setting the positions of the power-type energy storage device and / or the hydrogen fuel power generation device, so that the transient power angle instability of the power system can be effectively avoided, the problem that the power angle instability of a generator set in the existing power system can cause misoperation of power grid protection, and serious power accidents and large-area power outages can occur, which seriously affects the production and life of users is solved, and the blank that hydrogen energy storage cannot be applied to the research on transient power angle stability control of the power system is filled. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0049] Figure 1 A preselected installation node selection flowchart provided for the embodiments of the application;

[0050] Figure 2 Another preselected installation node selection flowchart provided for the embodiments of the application;

[0051] Figure 3 A general node and special node determination flowchart provided for the embodiments of the application;

[0052] Figure 4 A general node and special node determination flowchart provided for the embodiments of the application;

[0053] Figure 5 A generator set comprehensive participation factor determination flowchart provided for the embodiments of the application;

[0054] Figure 6 A transient power angle instability fault set determination flowchart provided for an embodiment of the present application;

[0055] Figure 7 A generator set participation factor calculation flowchart provided for an embodiment of the present application;

[0056] Figure 8 A comprehensive generator set participation factor calculation flowchart provided for an embodiment of the present application;

[0057] Figure 9 A transient power angle stability control method flowchart of a power system provided for an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0059] The embodiments of the present application provide a transient power angle stability control system of a power system to solve the problem that the power angle instability of a generator set in the existing power system will cause misoperation of power grid protection, trigger large-area power outage, and seriously affect user production and life.

[0060] The transient power angle stability control system of the power system mainly includes: a power-type energy storage device and / or a hydrogen fuel power generation device.

[0061] Among them, the power-type energy storage device is installed at a first preset position in the power system to absorb electric energy when the power system is cleared of faults; and / or the hydrogen fuel power generation device is installed at a second preset position in the power system to release electric energy when the power system is cleared of faults, so as to realize transient power angle stability control of the power system.

[0062] Specifically, the power-type energy storage device can be a flywheel energy storage, a super capacitor energy storage, or an electrochemical energy storage; the specific type of the power-type energy storage device is not specifically limited in the present application, and all are within the protection scope of the present application, as long as the specific application environment and user demand are determined.

[0063] In some embodiments, the transient power angle stability control system further includes a hydrogen production device installed at a preselected installation node in the power system, and the hydrogen production device is used to provide power generation fuel for the hydrogen fuel power generation device.

[0064] In practical applications, the hydrogen production device can be a water electrolysis hydrogen production device or other existing type of hydrogen production device, and the present application does not limit the same, which is within the protection scope of the present application.

[0065] In some embodiments, the hydrogen production device is generally installed at a preselected installation node in the power system.

[0066] The preselected installation node can be selected according to the following steps as shown in Figure 1 The preselected installation node can be selected according to the following steps as shown in

[0067] S100, topological analysis is performed on the power network in the power system to obtain current and voltage data of each node in the power network.

[0068] In practical applications, the topological analysis can be performed on the voltage and current flow direction and size of each node in the power network to obtain the current and voltage data of each node in the power network.

[0069] S102, selecting a node with the smallest fluctuation from the current and voltage data of each node in the power network as the preselected installation node.

[0070] In practical applications, in order to ensure the stable operation of the hydrogen production device, the node with smaller current and voltage fluctuation is preferentially selected for installation, and therefore, after obtaining the current and voltage data of each node in the power network, the node with the smallest current and voltage fluctuation can be selected as the preselected installation node.

[0071] Of course, in addition to the preselected installation node selection method shown above, in some embodiments, the preselected installation node selection process can also include the following steps as shown in Figure 2 The preselected installation node can be selected according to the following steps as shown in

[0072] S200, determining the ordinary nodes and special nodes of the power network in the power system.

[0073] The ordinary nodes are other nodes of the power network except the special nodes, and the number of special nodes is greater than 1.

[0074] In practical applications, the specific process of performing step S200 to determine the ordinary nodes and special nodes of the power network in the power system can include steps S300 and S302 as shown in Figure 3 The preselected installation node can be selected according to the following steps as shown in

[0075] S300, obtaining the annual disturbance frequency of each node in the power network.

[0076] In some embodiments, the disturbance frequency of each node in the power network within a year can be counted to obtain the annual disturbance frequency of each node in the power network.

[0077] S302, respectively, the node whose annual disturbance frequency is greater than the preset frequency, the new energy node as a special node, and the remaining nodes as ordinary nodes.

[0078] The new energy node can be a node whose type is a wind power node and a node whose type is a photovoltaic node.

[0079] The specific value of the preset frequency can be determined according to the application environment and user demand, for example, the preset frequency is 1, 2, 3, 5, etc. Regardless of the value of the preset frequency, it is within the protection scope of the present application.

[0080] It should be noted that in practice, the node whose annual disturbance statistical probability is greater than σ, the node whose type is a wind power node, and the node whose type is a photovoltaic node can also be special nodes, and the remaining nodes can be ordinary nodes. Wherein σ can be 0.01, of course, not limited to this, but also can be determined according to the specific application environment and user demand, the present application does not make specific limitation, all belong to the protection scope of the present application.

[0081] S202, respectively, the electrical distance between each ordinary node and each special node is calculated.

[0082] In some embodiments, the specific process of performing step S202, respectively, the electrical distance between each ordinary node and each special node is calculated, which can be as shown in Figure 4 , mainly including steps S400 to S404.

[0083] S400, the node admittance matrix of the power network is obtained.

[0084] In practical applications, the admittance between each node of the power network in the power system can be calculated first, and then a matrix is formed to obtain the node admittance matrix. The specific obtaining process can be referred to the existing scheme, which will not be repeated here.

[0085] S402, the node admittance matrix is inversely calculated to obtain the node impedance matrix of the power network.

[0086] In practical applications, the node admittance matrix can be inversely calculated to obtain the node impedance matrix of the power network. The specific inverse process can be referred to the existing scheme, which will not be repeated here.

[0087] S404, according to the node impedance matrix, the electrical distance between each ordinary node and each special node is obtained.

[0088] In practical applications, the electrical distance between each ordinary node and each special node can be obtained from the node impedance matrix.

[0089] Suppose the number of ordinary nodes is m, and they are arranged in order as 1, 2, …, m respectively; the number of special nodes is n, and they are arranged in order as m+1, m+2, …, m+n respectively, then the electrical distance between each ordinary node and each special node can be represented by matrix A:

[0090]

[0091] S204, from all ordinary nodes, select those ordinary nodes with the largest electrical distance from each special node as pre-selected installation nodes.

[0092] In actual application, after obtaining the electrical distance between each ordinary node and each special node in the power network, the ordinary nodes farthest from each special node are selected as pre-selected installation nodes.

[0093] Suppose the electrical distance between ordinary nodes and each special node in the power network is matrix A, then for matrix A, the largest element in each column vector can be selected and recorded as the ordinary node farthest from the special node in the column. Among them, suppose the largest element selected in the column vector is a j,m+i , then it is recorded as the ordinary node j farthest from the m+i th special node.

[0094] The set of ordinary nodes farthest away is obtained by combining all n column vectors in matrix A, and then one or more ordinary nodes are selected from the set of ordinary nodes farthest away as pre-selected installation nodes.

[0095] As can be understood from the above, the selection of the installation location of the hydrogen production device generally selects an area with smaller current and voltage fluctuations, that is, an area far from wind power nodes, photovoltaic nodes and nodes with high annual disturbance frequency.

[0096] In some embodiments, the power-type energy storage device is generally installed at a first generator set in the power system, and the hydrogen fuel power generation device is generally installed at a second generator set in the power system. Among them, the number of the first generator set and the second generator set is at least 1, the first generator set can be a generator set with a comprehensive participation factor greater than a first preset value, and the second generator set can be a generator set with a comprehensive participation factor less than a second preset value.

[0097] Specifically, the first preset value can be greater than 0, and the second preset value can be less than 0. Of course, the specific values of the first preset value and the second preset value are not limited to the above, but can be determined according to the specific application environment and user demand, which are not limited in the present application, and are within the protection scope of the present application.

[0098] It can be understood that the first preset position can be a first generator set in the power system, and the second preset position can be a second generator set in the power system.

[0099] Generally, the power system includes a plurality of generator sets, and the integrated participation factor of each generator set can be determined by, for example, Figure 5 The main process is as follows:

[0100] S500, determining a transient power angle instability fault set of the power system.

[0101] The transient power angle instability fault set includes a plurality of transient power angle instability faults.

[0102] In some embodiments, the specific process of performing step S500, determining the transient power angle instability fault set of the power system, can be as shown in Figure 6 , mainly including steps S600 to S602.

[0103] S600, respectively simulating each expected fault in the power system to obtain a dominant mode identification result of each expected fault.

[0104] In actual application, transient power angle stability analysis can be performed on all possible fault scenarios in the power system, that is, each expected fault in the power system is simulated to obtain a dominant mode identification result of each expected fault.

[0105] It should be noted that the expected fault is all possible fault scenarios in the power system, and the specific possible fault scenarios can be referred to in the prior art, which will not be described herein.

[0106] It should be further noted that the dominant mode identification result is used to represent the distribution of the leading group and the remaining group of each generator set in the power system under each expected fault state. Among them, the generator set with relatively advanced power angle belongs to the leading group, and the generator set with relatively lagging power angle belongs to the remaining group.

[0107] S602, obtaining a transient power angle instability fault set based on the dominant mode identification result of each expected fault.

[0108] Among them, for each expected fault with the same dominant mode identification result, one expected fault is selected from the expected faults with the same dominant mode identification result as a transient power angle instability fault in the transient power angle instability fault set; for each expected fault with different dominant mode identification results, each expected fault is directly taken as a transient power angle instability fault in the transient power angle instability fault set.

[0109] Specifically, the same dominant mode identification result means the same distribution of the leading group and the remaining group.

[0110] It can be understood that each transient power angle instability fault in the transient power angle instability fault set is obtained according to the dominant mode recognition result. When there are multiple same dominant mode recognition results, one of the multiple same dominant mode recognition results needs to be selected as a representative fault from the expected faults corresponding to the multiple same dominant mode recognition results, and the representative fault is taken as an element in the transient power angle instability fault set. When a certain dominant mode recognition result is different from other dominant mode recognition results, the expected fault corresponding to the dominant mode recognition result is directly taken as an element in the transient power angle instability fault set.

[0111] S502, calculate the participation factor of each generator set in each transient power angle instability fault in the power system.

[0112] In actual application, the specific process of performing step S502 to calculate the participation factor of each generator set in each transient power angle instability fault in the power system can be as shown in FIG. 7, mainly including steps S700 and S702: Figure 7

[0113] S700, determine the group attribute of each generator set in each transient power angle instability fault in the power system.

[0114] The group attribute includes a leading group and a remaining group.

[0115] It should be noted that the group attribute of each generator set in each transient power angle instability fault in the power system can be determined according to the dominant mode result corresponding to the transient power angle instability fault.

[0116] It should be noted that if the power angle of the generator set at the equilibrium point in the power system is leading, then the group attribute of the generator set is the leading group; if the power angle of the generator set at the equilibrium point in the power system is lagging, then the group attribute of the generator set is the remaining group.

[0117] S702, calculate according to the group attribute of the generator set in each transient power angle instability fault to obtain the participation factor of each generator set in each transient power angle instability fault.

[0118] If the group attribute of the generator set in the transient power angle instability fault is the leading group, then the maximum acceleration kinetic energy of each generator set in the attribute leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP is taken as the reference value, and the ratio of the acceleration kinetic energy of the generator set itself to the reference value when the equivalent disturbed trajectory passes through the dynamic saddle point DSP is taken as the participation factor of the generator set.

[0119] Specifically, the calculation formula of the participation factor of the generator set in the leading group can be: P​i P represents the participation factor of the generator set with the group attribute as the leading group, S represents the leading group, represents the maximum acceleration kinetic energy of the generator set with the group attribute as the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP. represents the maximum acceleration kinetic energy of the generator set with the group attribute as the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP.

[0120] If the group attribute of the generator set in the transient power angle instability fault is the remaining group, the maximum acceleration kinetic energy of each generator set with the group attribute as the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP is also taken as the reference value, and the opposite number of the ratio of the deceleration kinetic energy of the generator set when the equivalent disturbed trajectory passes through the dynamic saddle point DSP to the reference value is taken as the participation factor of the generator set.

[0121] Specifically, the calculation formula of the participation factor of the generator set with the group attribute as the remaining group can be: P k P represents the participation factor of the generator set with the group attribute as the leading group, S represents the leading group, represents the maximum acceleration kinetic energy of the generator set with the group attribute as the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP. represents the maximum acceleration kinetic energy of the generator set with the group attribute as the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point DSP.

[0122] S504, for each generator set, the participation factor of the generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault are calculated to obtain the comprehensive participation factor of each generator set in the power system.

[0123] The fault risk of the transient power angle instability fault can be calculated according to the occurrence probability and the control cost of the transient power angle instability fault. Specifically, the occurrence probability and the control cost of the transient power angle instability fault can be multiplied to obtain the fault risk of the transient power angle instability fault.

[0124] It should be noted that the occurrence probability of the transient power angle instability fault can be obtained by probability statistics, and the control cost of the transient power angle instability fault can be obtained by iterative simulation; of course, it is not limited to this, and other existing ways can also be used to obtain the occurrence probability and the control cost of the transient power angle instability fault, respectively, which are not limited in the present application, and are within the protection scope of the present application.

[0125] It should be further noted that the control cost generally refers to the minimum control cost required to restore the power system to stability from the transient power angle instability.

[0126] In actual application, the specific process of performing step S504, calculating the comprehensive participation factor of each generator set in the power system according to the participation factor of the generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault, can be as shown in the following table: Figure 8 As shown in the following table, the specific process mainly includes steps S800 to S802:

[0127] S800, respectively calculating the product of the participation factor of each generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault.

[0128] In actual application, the product of the participation factor of each generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault can be calculated respectively to obtain the product of the participation factor of each generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault.

[0129] S802, for each generator set, adding the product of the participation factor of the generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault to obtain the comprehensive participation factor of each generator set.

[0130] In actual application, the product of the participation factor of each generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault can be added, and the addition result can be taken as the comprehensive participation factor of each generator set.

[0131] It should be noted that in addition to the above-mentioned comprehensive participation factor determination method, the comprehensive participation factor of each generator set in the power system can also be determined by other existing methods. The comprehensive participation factor determination method is not limited in the present application, and is within the protection scope of the present application.

[0132] In some embodiments, the hydrogen fuel power generation device can include a hydrogen storage device and a hydrogen fuel cell. The hydrogen storage device can be used to store hydrogen generated by the hydrogen generation device, and the hydrogen fuel cell can be used to generate electricity by taking hydrogen from the hydrogen storage device.

[0133] In combination with the above, it can be understood that the hydrogen fuel power generation device is generally selected to be installed near the possible remaining group, so as to quickly release hydrogen fuel cell electric energy at the moment of clearing the power system fault, and make up for the insufficient power supply capacity of each generator set in the remaining group; the power type energy storage device is generally selected to be installed near the possible leading group, so as to quickly absorb the kinetic energy of each generator set in the leading group at the moment of clearing the power system fault, and make the power system quickly recover.

[0134] Based on the above principle, the transient power angle stability control system of the power system provided by the embodiment comprises: a power type energy storage device and / or a hydrogen fuel power generation device; the power type energy storage device is installed at a first preset position in the power system to absorb electric energy when the power system is cleared of failure; and / or the hydrogen fuel power generation device is installed at a second preset position in the power system to release electric energy when the power system is cleared of failure, so as to realize the transient power angle stability control of the power system, that is, the present application can make the power type energy storage device and / or the hydrogen fuel power generation device participate in the transient power angle stability control of the power system by reasonably setting the positions of the power type energy storage device and / or the hydrogen fuel power generation device, so as to effectively avoid the transient power angle instability of the power system, solve the problem that the power angle instability of the generator set in the existing power system will cause the misoperation of the power grid protection and cause large-area power failure, and seriously affect the production and life of users, and fill the blank that hydrogen energy storage cannot be applied to the research on the transient power angle stability control of the power system.

[0135] It is worth noting that, compared with other types of energy storage such as supercapacitors or lithium batteries, hydrogen energy storage has better energy density and stronger continuous power supply capability, and can be used as a long-term energy storage unit; and compared with traditional machine cutting loads, hydrogen energy storage can quickly store and release energy, thereby improving energy utilization, so the present application introduces hydrogen energy storage into the power system to build the second and third lines of defense and participate in the safe and stable control of the large power grid, which has a good engineering prospect.

[0136] In addition, since the flywheel energy storage has many advantages such as high energy storage density, high efficiency, large instantaneous power, fast response speed, long service life, and no geographical environment limit, in the energy storage stage, the flywheel body is accelerated to a certain speed by the motor to convert electric energy into kinetic energy, so based on the advantages of flywheel energy storage, the present application introduces flywheel energy storage and hydrogen energy storage into the transient power angle stability control of the power system to play their respective technical and economic advantages and realize complementary advantages.

[0137] It is more worth noting that the present application also provides an optimal scheme for the installation positions of the hydrogen production device, the power type energy storage device and the hydrogen fuel power generation device. By setting the devices at the installation positions shown in the optimal scheme, the transient power angle stability of the power system can be realized with the least resources, and the stability of the system can be maximized; and the installation positions of the hydrogen production device and the hydrogen fuel power generation device can be determined according to their respective purposes, and the two devices do not need to be placed in the same place, which is more conducive to improving the synergistic effect.

[0138] Based on the above-mentioned transient power angle stability control system of the power system, another embodiment of the present application also provides a transient power angle stability control method of a power system, please see Figure 9 , which mainly comprises:

[0139] S900, judging whether the fault in the power system is cleared in real time.

[0140] In practical application, the current state operation data of the power system can be monitored in real time, and whether the fault in the power system is cleared can be judged according to the current operation data.

[0141] Specifically, when the current state operation data changes from abnormality to normality, it can be judged that the fault in the power system is cleared, and otherwise, if the current state operation data is always abnormal, it can be judged that the fault in the power system is not cleared, and the subsequent control step is not executed.

[0142] If it is judged that the fault in the power system is cleared, step S902 can be executed.

[0143] S902, controlling the hydrogen fuel power generation device in the transient power angle stability control system to release electric energy and / or the power type energy storage device to absorb electric energy.

[0144] In practical application, when it is judged that the fault in the power system is cleared, the hydrogen fuel power generation device in the transient power angle stability control system can be controlled to release electric energy in time to make up for the insufficient capacity of the generator set in the power system, and / or the power type energy storage device can be controlled to absorb the excess energy of the generator set in the power system in time, so as to make the system quickly recover to stability.

[0145] In the embodiment, whether the fault in the power system is cleared can be judged in real time, so as to control the hydrogen fuel power generation device and / or the power type energy storage device in the transient power angle stability control system when it is judged that the fault in the power system is cleared, to make up for the insufficient capacity of the generator set in the power system and / or absorb the excess energy of the generator set in the power system, so as to make the system quickly recover to stability.

[0146] Those skilled in the art will further appreciate that the units and algorithms described in connection with the examples disclosed herein can be embodied in electronic hardware, computer software, or combinations of both to perform the various functions described herein. To clearly illustrate this interchangeability of hardware and software, various examples disclosed herein have been described generally in terms of their functionality, without reference to the particular manner in which they are implemented. Those skilled in the art will recognize that the preferred implementations include hardware and software components, and the descriptions above should be understood as being exemplary only. Those skilled in the art will recognize that the embodiments described herein can be implemented in a number of ways, and that the implementations described herein should not be construed as limiting.

[0147] In this application, terms such as first and second, etc., are used merely to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the use of the term "including", "containing", or any other variant thereof, is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or even inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0148] The above description of disclosed embodiments provides enabling concepts for making or using the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transient power angle stability control system for a power system, characterized in that, include: Power-type energy storage devices and / or hydrogen fuel cell power generation devices; The power-type energy storage device is installed at a first preset location in the power system so that the power-type energy storage device absorbs electrical energy when the power system fault is cleared. And / or, the hydrogen fuel power generation device is installed at a second preset location in the power system so that the hydrogen fuel power generation device releases electrical energy when the power system fault is cleared, so as to achieve transient power angle stabilization control of the power system; The first preset location is the first generator set in the power system, and the second preset location is the second generator set in the power system; Wherein, the number of the first generator set and the second generator set is at least 1, the first generator set is a generator set whose comprehensive participation factor is greater than a first preset value, the second generator set is a generator set whose comprehensive participation factor is less than a second preset value, the first preset value is greater than 0, and the second preset value is less than 0; The process of determining the comprehensive participation factor of the generator set includes: determining the set of transient power angle instability faults in the power system; the set of transient power angle instability faults includes several transient power angle instability faults; Calculate the participation factor of each generator unit in the power system in each of the transient power angle instability faults; For each generator set, the comprehensive participation factor of each generator set in the power system is calculated based on the participation factor of the generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault. The fault risk of the transient power angle instability fault is calculated based on the occurrence probability and control cost of the transient power angle instability fault.

2. The transient power angle stability control system for a power system according to claim 1, characterized in that, The set of transient power angle instability faults in the power system is determined, including: Simulations were performed on each anticipated fault in the power system to obtain the dominant pattern identification results for each anticipated fault. Based on the dominant mode identification results of each of the anticipated faults, the transient power angle instability fault set is obtained: for each of the anticipated faults with the same dominant mode identification result, one is selected to be included in the transient power angle instability fault set; for each of the anticipated faults with different dominant mode identification results, each of the anticipated faults is directly included in the transient power angle instability fault set.

3. The transient power angle stability control system for a power system according to claim 1, characterized in that, The participation factors of each generator unit in the power system in each transient power angle instability fault are calculated, including: Determine the group attributes of each generator unit in the power system for each transient power angle instability fault; the group attributes include leading group and remaining group. The participation factor of each generator set in each transient power angle instability fault is calculated based on the group attribute of the generator set in each transient power angle instability fault. If the group attribute of the generator set in the transient power angle instability fault is a leading group, then the maximum acceleration kinetic energy of each generator set in the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point is taken as the benchmark value, and the ratio of the generator set's own acceleration kinetic energy when the equivalent disturbed trajectory passes through the dynamic saddle point to the benchmark value is taken as the participation factor of the generator set. If the group attribute of the generator set in the transient power angle instability fault is the remaining group, then the maximum acceleration kinetic energy of each generator set in the leading group when the equivalent disturbed trajectory passes through the dynamic saddle point is also used as the reference value, and the negative number of the ratio of the generator set's own deceleration kinetic energy when the equivalent disturbed trajectory passes through the dynamic saddle point to the reference value is used as the participation factor of the generator set.

4. The transient power angle stability control system for a power system according to claim 1, characterized in that, For each generator set, the comprehensive participation factor of each generator set in the power system is calculated based on the participation factor of the generator set in each transient power angle instability fault and the fault risk of the corresponding transient power angle instability fault, including: The participation factor of each generator set in each transient power angle instability fault and the product of the fault risk of the corresponding transient power angle instability fault are calculated respectively. For each generator set, the participation factor of the generator set in each transient power angle instability fault is accumulated by multiplying the product of the fault risk of the corresponding transient power angle instability fault to obtain the comprehensive participation factor of each generator set.

5. The transient power angle stability control system for a power system according to claim 1, characterized in that, Also includes: A hydrogen production unit installed at a pre-selected node in the power system, the hydrogen production unit being used to provide fuel for the hydrogen fuel power generation unit.

6. The transient power angle stability control system for a power system according to claim 5, characterized in that, The hydrogen fuel power generation device includes: a hydrogen storage device and a hydrogen fuel cell; The hydrogen storage device is used to store the hydrogen produced by the hydrogen production device; the hydrogen fuel cell is used to draw hydrogen from the hydrogen storage device to generate electricity.

7. The transient power angle stability control system for a power system according to claim 5, characterized in that, The selection process for the pre-selected installation nodes includes: A topology analysis is performed on the power network of the power system to obtain the current and voltage data of each node in the power network; From the current and voltage data of each node in the power network, the node with the smallest current and voltage fluctuation is selected as the pre-selected installation node.

8. The transient power angle stability control system for a power system according to claim 5, characterized in that, The selection process for the pre-selected installation nodes includes: Identify the ordinary nodes and special nodes of the power network in the power system; the ordinary nodes are all other nodes in the power network besides the special nodes. Calculate the electrical distance between each of the ordinary nodes and each of the special nodes respectively; From all the ordinary nodes, select those ordinary nodes with the largest electrical distance from each of the special nodes as the pre-selected installation nodes.

9. The transient power angle stability control system for a power system according to claim 8, characterized in that, The ordinary nodes and special nodes of the power network in the power system are identified as follows: Obtain the annual number of disturbances for each node in the power network; The nodes that are disturbed more than a preset number of times per year and the new energy nodes are respectively designated as special nodes, and the remaining nodes are designated as ordinary nodes.

10. The transient power angle stability control system for a power system according to claim 8, characterized in that, The electrical distances between each of the ordinary nodes and each of the special nodes are calculated separately, including: Calculate the node admittance matrix of the power network; The node impedance matrix of the power network is obtained by inverting the node admittance matrix. Based on the node impedance matrix, the electrical distance between each of the ordinary nodes and each of the special nodes is obtained.

11. A transient power angle stability control method for a power system, characterized in that, The method, applied to a transient power angle stability control system for a power system as described in any one of claims 1-10, comprises: Real-time determination of whether faults in the power system have been cleared; If the fault in the power system is determined to be cleared, the hydrogen fuel power generation device in the transient power angle stabilization control system is controlled to release electrical energy and / or the power storage device absorbs electrical energy.

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