CN116780641A - Virtual synchronous parameter self-adaption method and device for flexible direct current output island system - Google Patents
Virtual synchronous parameter self-adaption method and device for flexible direct current output island system Download PDFInfo
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Abstract
The application relates to a virtual synchronous parameter self-adaption method, device and equipment of a flexible direct current output island system, wherein the method comprises the steps of obtaining first power data, connection impedance data, rotational inertia data and second power data of the flexible direct current output island system; calculating a power conversion coefficient according to the first power data, the connection impedance data and the second power data; calculating to obtain an inertia coefficient according to the connection impedance data and the rotational inertia data; the first direct current output power according to the first power data, the second direct current output power according to the second power data, the power conversion coefficient and the inertia coefficient are used as control parameters of virtual synchronous control. According to the method, the first direct current output power, the second direct current output power, the power conversion coefficient and the inertia coefficient are used as control parameters of virtual synchronous control in the flexible direct current output island system, and the phenomenon that the flexible direct current output island system is unstable in power angle due to the fact that the inertia time constant of the virtual synchronous control is set improperly is avoided.
Description
Technical Field
The application relates to the technical field of control of power systems, in particular to a virtual synchronization parameter self-adaption method, device and equipment of a flexible direct current output island system.
Background
The large-scale new energy resource is located in desert, gobi and remote desert areas, the local power grid is weak, and the operation difficulty of the new energy island is high. Therefore, the large-scale new energy can be weakly connected with the local power grid and then sent out through flexible direct current. In a large-scale new energy weak networking sending system, the local power grid is long in electrical distance, and is insufficient in new energy supporting capability, and flexible direct current networking is often required. The flexible direct current adopts fixed-amplitude and fixed-frequency control (VF control). The fixed frequency control adopts a given value and virtual synchronous control. Virtual synchronization control is divided into two types: and setting frequency deviation control according to the power deviation and a certain proportion coefficient, and dynamically adjusting the frequency control according to the power deviation and a certain inertia time constant.
The problems of adopting fixed-amplitude and fixed-frequency control in a large-scale new energy weak network sending system are as follows:
the flexible direct current frequency controlled by the fixed frequency is constant, the primary frequency modulation cannot be participated, and if the local power network has high-power disturbance such as cutting machine/cutting load, the flexible direct current bears a large amount of unbalanced power. When the cut-off/cut-off load power is greater than the flexible direct current adjustability, the flexible direct current converter station power will saturate, resulting in control failure and further risk for safe operation of the delivery system.
The flexible direct current frequency adopting virtual synchronous control can be adjusted according to unbalanced power, and the bearing amount of unbalanced power can be reduced, but if the inertia time constant is improperly set, the flexible direct current phase angle is easily swung out too much after the fault, so that the power angle instability occurs between the flexible direct current phase angle and a weak current network.
Disclosure of Invention
The embodiment of the application provides a virtual synchronization parameter self-adaption method, device and equipment of a flexible direct current output island system, which are used for solving the technical problem that the existing new energy weak networking is easy to generate power angle instability after faults occur due to improper setting of inertia time constants by adopting virtual synchronization control in the flexible direct current output island system.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
on the one hand, a virtual synchronous parameter self-adaption method of a flexible direct current output island system is provided, and the method comprises the following steps:
acquiring first power data, connection impedance data, rotational inertia data and second power data of a power transmission line in the flexible direct current output island system, wherein the second power data is obtained by low-pass filtering the transmission power of the power transmission line in the flexible direct current output island system;
calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system;
calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control;
and controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient as control parameters of virtual synchronous control.
Preferably, the first power data includes a first outgoing power, a first direct current output power and a first tie line power of each synchronous cluster, the second power data includes a second outgoing power, a second direct current output power and a second tie line power of each synchronous cluster, the first tie line power and the second tie line power are tie line powers of a flexible direct current outgoing island system and a local synchronous grid of the power system, the tie impedance data includes cluster tie impedance and synchronous tie impedance of each synchronous cluster, and the moment of inertia data includes cluster moment of inertia and synchronous grid moment of inertia of each synchronous cluster.
Preferably, the calculating according to the first power data, the connection impedance data and the second power data, to obtain a power conversion coefficient of virtual synchronization control in the flexible direct current output island system includes:
calculating the first output power of each synchronous machine group and the second output power corresponding to the first output power to obtain the output power difference value of each synchronous machine group;
calculating the first direct current output power and the second direct current output power to obtain a direct current output power difference value; calculating the first tie line power and the second tie line power to obtain a tie line power difference value;
calculating the sending power difference value of each synchronous cluster and the corresponding cluster connection impedance to obtain first data of each synchronous cluster; calculating the tie line power difference value and the synchronous tie impedance to obtain second data;
and calculating the difference values of all the first data, the second data and the direct current output power to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system.
Preferably, the virtual synchronization parameter adaptive method of the flexible direct current output island system comprises the following steps: calculating by a power conversion coefficient calculation formula according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system, wherein the power conversion coefficient calculation formula is as follows:
wherein K is p Is a power conversion systemThe number n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid For the second link power, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
Preferably, calculating, according to the connection impedance data and the moment of inertia data, an inertia coefficient of virtual synchronization control includes:
calculating the cluster connection impedance of each synchronous cluster and the corresponding cluster moment of inertia thereof to obtain first inertia data of each synchronous cluster;
calculating the synchronous connection impedance and the rotational inertia of the synchronous power grid to obtain second inertial data;
and calculating according to all the first inertial data and the second inertial data to obtain the inertial coefficient of the virtual synchronous control.
Preferably, the virtual synchronization parameter adaptive method of the flexible direct current output island system comprises the following steps: calculating by adopting an inertia coefficient calculation formula according to the connection impedance data and the moment of inertia data to obtain an inertia coefficient of virtual synchronous control; the inertial coefficient calculation formula is as follows:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
In still another aspect, a virtual synchronization parameter adaptive device of a flexible direct current output island system is provided, which comprises a data acquisition module, a first calculation module, a second calculation module and an execution control module;
the data acquisition module is used for acquiring first power data, connection impedance data, rotational inertia data and second power data of the power transmission line in the flexible direct current output island system, wherein the second power data is obtained by low-pass filtering the transmission power of the power transmission line in the flexible direct current output island system;
the first calculation module is used for calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system;
the second calculation module is used for calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control;
the execution control module is used for controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient as control parameters of virtual synchronous control.
Preferably, the first calculation module is further configured to calculate, according to the first power data, the connection impedance data, and the second power data, by using a power conversion coefficient calculation formula, a power conversion coefficient of virtual synchronization control in the flexible direct current output island system, where the power conversion coefficient calculation formula is:
wherein K is p For the power conversion coefficient, n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid Is a second connecting linePower, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
Preferably, the second calculation module is further configured to calculate, according to the connection impedance data and the moment of inertia data, by using an inertia coefficient calculation formula, to obtain an inertia coefficient of virtual synchronization control; the inertial coefficient calculation formula is as follows:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
In yet another aspect, a terminal device is provided that includes a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
and the processor is used for executing the virtual synchronous parameter self-adaption method of the flexible direct current output island system according to the instructions in the program codes.
From the above technical solutions, the embodiment of the present application has the following advantages: the method comprises the steps of obtaining first power data, connection impedance data, rotational inertia data and second power data of a power transmission line in the flexible direct current output island system; calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system; calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control; and controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient serving as control parameters of virtual synchronous control. According to the virtual synchronization parameter self-adaption method of the flexible direct current output island system, the power conversion coefficient and the inertia coefficient of virtual synchronization control are obtained through calculation of the obtained first power data, the connection impedance data, the rotational inertia data and the second power data, the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient are used as control parameters of the virtual synchronization control, the virtual synchronization control of the flexible direct current output island system controls the flexible direct current output island system to operate according to the control parameters, the phenomenon that the inertia time constant of the virtual synchronization control is improper is avoided, the phenomenon that the flexible direct current output island system is unstable in power angle after a fault occurs is avoided, and the technical problem that the existing new energy weak networking is unstable in power angle due to the fact that the inertia time constant is improper in virtual synchronization control is adopted by the flexible direct current output island system is solved.
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In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of steps of a method for adapting virtual synchronization parameters of a flexible dc output island system according to an embodiment of the present application;
fig. 2 is a schematic topology diagram of a flexible dc output island system in a virtual synchronization parameter adaptive method of the flexible dc output island system according to an embodiment of the present application;
fig. 3 is a schematic diagram of a framework of virtual synchronization control of the flexible dc output island system in the method for adapting virtual synchronization parameters of the flexible dc output island system according to the embodiment of the present application;
fig. 4 is a frame diagram of a virtual synchronization parameter adaptive device of a flexible dc output island system according to an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
The embodiment of the application provides a virtual synchronization parameter self-adaption method, device and equipment of a flexible direct current output island system, which are used for solving the technical problem that the existing new energy weak networking is easy to generate power angle instability after faults occur due to improper setting of inertia time constants by adopting virtual synchronization control in the flexible direct current output island system.
Embodiment one:
fig. 1 is a flow chart of steps of a method for adapting virtual synchronization parameters of a flexible dc output island system according to an embodiment of the present application, fig. 2 is a schematic topology diagram of the flexible dc output island system in the method for adapting virtual synchronization parameters of the flexible dc output island system according to the embodiment of the present application, and fig. 3 is a schematic framework diagram of virtual synchronization control of the flexible dc output island system in the method for adapting virtual synchronization parameters of the flexible dc output island system according to the embodiment of the present application.
As shown in fig. 1, the embodiment of the application provides a virtual synchronization parameter self-adapting method of a flexible direct current output island system, which comprises the following steps:
s1, acquiring first power data, connection impedance data, rotational inertia data and second power data of a power transmission line in a flexible direct current output island system, wherein the second power data is obtained by low-pass filtering the transmission power of the power transmission line in the flexible direct current output island system.
It should be noted that, in step S1, data required by virtual synchronization parameters of the flexible dc output island system are obtained, the first power data includes a first output power, a first dc output power, and a first link power of each synchronous cluster, the second power data includes a second output power, a second dc output power, and a second link power of each synchronous cluster, the first link power and the second link power are both link powers of the flexible dc output island system and a local synchronous power grid of the power system, the link impedance data includes a cluster link impedance and a synchronous link impedance of each synchronous cluster, and the rotational inertia data includes a cluster rotational inertia and a synchronous power grid rotational inertia of each synchronous cluster. In this embodiment, transmission power on a transmission line of the flexible direct current output island system is obtained at regular intervals as first power data, and transmission power on the transmission line of the flexible direct current output island system is obtained in real time and is obtained as second power data through low-pass filtering processing with a bandwidth smaller than 10 Hz.
In the embodiment of the present application, as shown in fig. 2, the virtual synchronization parameter adaptive method of the flexible dc output island system uses the flexible dc output island systems of two synchronous clusters as a case description, and the acquired first power data includes the first output power P of the synchronous cluster 1 sg1(0) First power P of synchronous machine group 2 sg2(0) First DC output power P hvdc(0) First tie line power P grid(0) The second power data includes the second power P of the synchronous machine group 1 sg1 Second power P of synchronous machine group 2 sg2 Second DC output power P hvdc Second link power P grid The communication impedance data includes a cluster communication impedance X of the synchronous cluster 1 sg1 Group connection impedance X of synchronous group 2 sg2 Synchronous connection impedance X grid The moment of inertia data includes a cluster moment of inertia J of the synchronous cluster 1 sg1 Cluster moment of inertia J of synchronous cluster 2 sg2 And synchronous grid moment of inertia J grid 。
S2, calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system.
In step S2, a power conversion coefficient of the virtual synchronization control of the flexible dc output island system is obtained by performing calculation according to the data obtained in step S1.
S3, calculating according to the connection impedance data and the rotational inertia data to obtain the inertia coefficient of the virtual synchronous control.
In step S3, the inertia coefficient of the virtual synchronization control of the flexible dc output island system is obtained by performing calculation according to the data obtained in step S1.
S4, controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient serving as control parameters of virtual synchronous control.
In the step S4, the first dc output power obtained in the step S1, the second dc output power, the power conversion coefficient obtained in the step S2 and the inertia coefficient obtained in the step S3 are used as control parameters of the virtual synchronization control, and the virtual synchronization control of the flexible dc output island system controls the flexible dc output island system to operate according to the control parameters, so that the phenomenon of power angle instability of the flexible dc output island system after the fault occurs due to improper setting of an inertia time constant of the virtual synchronization control is avoided. In this embodiment, the virtual synchronization control of the virtual synchronization parameter adaptive method of the flexible dc output island system is performed according to the control structure shown in fig. 3.
The application provides a virtual synchronization parameter self-adaption method of a flexible direct current output island system, which comprises the steps of obtaining first power data, connection impedance data, rotational inertia data and second power data of a power transmission line in the flexible direct current output island system; calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system; calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control; and controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient serving as control parameters of virtual synchronous control. According to the virtual synchronization parameter self-adaption method of the flexible direct current output island system, the power conversion coefficient and the inertia coefficient of virtual synchronization control are obtained through calculation of the obtained first power data, the connection impedance data, the rotational inertia data and the second power data, the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient are used as control parameters of the virtual synchronization control, the virtual synchronization control of the flexible direct current output island system controls the flexible direct current output island system to operate according to the control parameters, the phenomenon that the inertia time constant of the virtual synchronization control is improper is avoided, the phenomenon that the flexible direct current output island system is unstable in power angle after a fault occurs is avoided, and the technical problem that the existing new energy weak networking is unstable in power angle due to the fact that the inertia time constant is improper in virtual synchronization control is adopted by the flexible direct current output island system is solved.
In one embodiment of the present application, calculating, according to the first power data, the connection impedance data, and the second power data, a power conversion coefficient for virtual synchronization control in a flexible direct current output island system includes:
calculating the first output power of each synchronous machine group and the second output power corresponding to the first output power to obtain the output power difference value of each synchronous machine group;
calculating the first direct current output power and the second direct current output power to obtain a direct current output power difference value; calculating the first link power and the second link power to obtain a link power difference value;
calculating the sending power difference value of each synchronous cluster and the corresponding cluster connection impedance to obtain first data of each synchronous cluster; calculating the power difference value of the connecting line and the synchronous connecting impedance to obtain second data;
and calculating the difference value of all the first data, the second data and the direct current output power to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system.
The difference between the output powers of the synchronous clusters is calculated by subtracting the first output power of each synchronous cluster from the second output power of the corresponding synchronous cluster. The dc output power difference is calculated from the first dc output power minus the second dc output power. The link power difference is calculated from the first link power subtracted from the second link power. The first data is calculated by multiplying the difference of the sending power of each synchronous machine group by the cluster connection impedance of each synchronous machine group. The second data is calculated from the link power difference multiplied by the synchronous link impedance. The power conversion coefficient is calculated by dividing the data obtained by adding the second data to all the first data by the direct current output power difference value.
In one embodiment of the present application, the method for adapting virtual synchronization parameters of the flexible direct current output island system includes: calculating by adopting a power conversion coefficient calculation formula according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system, wherein the power conversion coefficient calculation formula is as follows:
wherein K is p For the power conversion coefficient, n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid For the second link power, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
It should be noted that, the adaptive method for virtual synchronization parameters of the flexible dc output island system uses the flexible dc output island system shown in fig. 2 to calculate the power conversion coefficient of virtual synchronization control in the flexible dc output island system as follows:
the synchronization cluster of this calculated power conversion coefficient is two.
In one embodiment of the present application, calculating the inertia coefficient for virtual synchronization control from the tie impedance data and the moment of inertia data includes:
calculating the cluster connection impedance of each synchronous cluster and the corresponding cluster moment of inertia thereof to obtain first inertia data of each synchronous cluster;
calculating the synchronous connection impedance and the rotational inertia of the synchronous power grid to obtain second inertial data;
and calculating according to all the first inertial data and the second inertial data to obtain the inertial coefficient of the virtual synchronous control.
The first inertia data is calculated by multiplying the cluster connection impedance of a synchronous cluster by the cluster moment of inertia of the synchronous cluster. The second inertial data is calculated from the synchronous connection impedance multiplied by the synchronous grid moment of inertia. The inertia coefficient of the virtual synchronous control is obtained by adding all the first inertia data and the second inertia data.
In one embodiment of the present application, a virtual synchronization parameter adaptive method of a flexible direct current output island system includes: calculating by adopting an inertia coefficient calculation formula according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control; the inertia coefficient calculation formula is:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
It should be noted that, the adaptive method for virtual synchronization parameters of the flexible dc output island system uses the flexible dc output island system shown in fig. 2 to calculate the power conversion coefficient of virtual synchronization control in the flexible dc output island system as follows: j (J) hvdc ＝J sg1 X sg1 +J sg2 X sg2 +J grid X grid 。
Embodiment two:
fig. 4 is a frame flow chart of a virtual synchronization parameter adaptive device of a flexible direct current output island system according to an embodiment of the application.
As shown in fig. 4, the embodiment of the present application provides a virtual synchronization parameter adaptive device of a flexible dc output island system, which includes a data acquisition module 10, a first calculation module 20, a second calculation module 30, and an execution control module 40;
the data acquisition module 10 is configured to acquire first power data, connection impedance data, moment of inertia data and second power data of a power transmission line in the flexible direct current output island system, where the second power data is obtained by low-pass filtering transmission power of the power transmission line in the flexible direct current output island system;
the first calculation module 20 is configured to calculate, according to the first power data, the connection impedance data, and the second power data, a power conversion coefficient of virtual synchronization control in the flexible direct current output island system;
a second calculation module 30, configured to calculate, according to the connection impedance data and the moment of inertia data, an inertia coefficient of the virtual synchronization control;
the execution control module 40 is configured to control operation of the flexible dc output island system according to the first dc output power of the first power data, the second dc output power of the second power data, the power conversion coefficient, and the inertia coefficient as control parameters of the virtual synchronization control.
In the embodiment of the present application, the first calculation module 20 is further configured to calculate, according to the first power data, the connection impedance data, and the second power data, by using a power conversion coefficient calculation formula, a power conversion coefficient of virtual synchronization control in the flexible direct current output island system, where the power conversion coefficient calculation formula is:
wherein K is p For the power conversion coefficient, n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid For the second link power, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
In the embodiment of the present application, the second calculation module 30 is further configured to calculate, according to the connection impedance data and the moment of inertia data, by using an inertia coefficient calculation formula, to obtain an inertia coefficient of the virtual synchronization control; the inertia coefficient calculation formula is:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
It should be noted that, the module in the second device corresponds to the steps in the method in the first embodiment, the content of the virtual synchronization parameter adaptive method of the flexible dc output island system has been described in detail in the first embodiment, and the content of the module in the second device will not be described in detail in the second embodiment.
Embodiment III:
the embodiment of the application provides terminal equipment, which comprises a processor and a memory;
a memory for storing program code and transmitting the program code to the processor;
and the processor is used for executing the virtual synchronous parameter self-adaption method of the flexible direct current output island system according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the embodiment of the virtual synchronization parameter adaptive method of the flexible dc-out island system according to the instructions in the program code. In the alternative, the processor, when executing the computer program, performs the functions of the modules/units in the system/apparatus embodiments described above.
For example, a computer program may be split into one or more modules/units, which are stored in a memory and executed by a processor to perform the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.
The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the terminal device is not limited and may include more or less components than those illustrated, or may be combined with certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown 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 units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The virtual synchronous parameter self-adaption method of the flexible direct current output island system is characterized by comprising the following steps of:
acquiring first power data, connection impedance data, rotational inertia data and second power data of a power transmission line in the flexible direct current output island system, wherein the second power data is obtained by low-pass filtering the transmission power of the power transmission line in the flexible direct current output island system;
calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system;
calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control;
and controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient as control parameters of virtual synchronous control.
2. The method for adapting virtual synchronization parameters of a flexible direct current outgoing island system according to claim 1, wherein the first power data comprises a first outgoing power, a first direct current outgoing power and a first link power of each synchronous cluster, the second power data comprises a second outgoing power, a second direct current outgoing power and a second link power of each synchronous cluster, the first link power and the second link power are both link powers of the flexible direct current outgoing island system and a local synchronous grid of a power system, the link impedance data comprises a cluster link impedance and a synchronous link impedance of each synchronous cluster, and the rotational inertia data comprises a cluster rotational inertia and a synchronous grid rotational inertia of each synchronous cluster.
3. The method for adapting virtual synchronization parameters of a flexible direct current output island system according to claim 2, wherein calculating, according to the first power data, the connection impedance data, and the second power data, a power conversion coefficient of virtual synchronization control in the flexible direct current output island system comprises:
calculating the first output power of each synchronous machine group and the second output power corresponding to the first output power to obtain the output power difference value of each synchronous machine group;
calculating the first direct current output power and the second direct current output power to obtain a direct current output power difference value; calculating the first tie line power and the second tie line power to obtain a tie line power difference value;
calculating the sending power difference value of each synchronous cluster and the corresponding cluster connection impedance to obtain first data of each synchronous cluster; calculating the tie line power difference value and the synchronous tie impedance to obtain second data;
and calculating the difference values of all the first data, the second data and the direct current output power to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system.
4. The virtual synchronization parameter adaptation method of a flexible direct current outgoing island system according to claim 2, comprising: calculating by a power conversion coefficient calculation formula according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system, wherein the power conversion coefficient calculation formula is as follows:
wherein K is p For the power conversion coefficient, n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid For the second link power, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
5. The method for adapting virtual synchronization parameters of a flexible dc-out island system according to claim 2, wherein calculating, based on the connection impedance data and the moment of inertia data, an inertia coefficient for virtual synchronization control comprises:
calculating the cluster connection impedance of each synchronous cluster and the corresponding cluster moment of inertia thereof to obtain first inertia data of each synchronous cluster;
calculating the synchronous connection impedance and the rotational inertia of the synchronous power grid to obtain second inertial data;
and calculating according to all the first inertial data and the second inertial data to obtain the inertial coefficient of the virtual synchronous control.
6. The virtual synchronization parameter adaptation method of a flexible direct current outgoing island system according to claim 2, comprising: calculating by adopting an inertia coefficient calculation formula according to the connection impedance data and the moment of inertia data to obtain an inertia coefficient of virtual synchronous control; the inertial coefficient calculation formula is as follows:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
7. The virtual synchronous parameter self-adaptive device of the flexible direct current out-island system is characterized by comprising a data acquisition module, a first calculation module, a second calculation module and an execution control module;
the data acquisition module is used for acquiring first power data, connection impedance data, rotational inertia data and second power data of the power transmission line in the flexible direct current output island system, wherein the second power data is obtained by low-pass filtering the transmission power of the power transmission line in the flexible direct current output island system;
the first calculation module is used for calculating according to the first power data, the connection impedance data and the second power data to obtain a power conversion coefficient of virtual synchronous control in the flexible direct current output island system;
the second calculation module is used for calculating according to the connection impedance data and the rotational inertia data to obtain an inertia coefficient of virtual synchronous control;
the execution control module is used for controlling the operation of the flexible direct current out-island system according to the first direct current output power of the first power data, the second direct current output power of the second power data, the power conversion coefficient and the inertia coefficient as control parameters of virtual synchronous control.
8. The device for adapting virtual synchronization parameters of a flexible direct current output island system according to claim 7, wherein the first calculation module is further configured to calculate a power conversion coefficient for virtual synchronization control in the flexible direct current output island system according to a power conversion coefficient calculation formula according to the first power data, the connection impedance data, and the second power data, where the power conversion coefficient calculation formula is:
wherein K is p For the power conversion coefficient, n is the total number of synchronous clusters in the flexible direct current output island system, P sgi(0) First power output for the ith synchronous cluster, P sgi Second power output for the ith synchronous cluster, P grid(0) For the first tie-line power, P grid For the second link power, X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, P hvdc(0) For a first DC output power, P hvdc And is the second dc output power.
9. The adaptive device for virtual synchronization parameters of a flexible direct current output island system according to claim 7, wherein the second calculation module is further configured to calculate an inertia coefficient by using an inertia coefficient calculation formula according to the connection impedance data and the moment of inertia data, so as to obtain an inertia coefficient of virtual synchronization control; the inertial coefficient calculation formula is as follows:
wherein J is the inertia coefficient of virtual synchronous control, n is the total number of synchronous clusters in the flexible direct current output island system, and X sgi Group connection impedance, X, for the ith synchronous group grid To synchronize the connection impedance, J sgi Group moment of inertia, J, for the ith synchronous group grid To synchronize the moment of inertia of the grid.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the virtual synchronization parameter adaptation method of the flexible direct current output island system according to the instructions in the program code.
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