CN115276128B - Synchronous stability verification method and device for new energy and camera-adjusting combined system - Google Patents

Synchronous stability verification method and device for new energy and camera-adjusting combined system Download PDF

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CN115276128B
CN115276128B CN202210815891.0A CN202210815891A CN115276128B CN 115276128 B CN115276128 B CN 115276128B CN 202210815891 A CN202210815891 A CN 202210815891A CN 115276128 B CN115276128 B CN 115276128B
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new energy
camera
active power
combined system
power
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CN115276128A (en
Inventor
李善颖
谢欢
赵天骐
辛焕海
严乙桉
吴涛
刘蔚
梁浩
沈广进
金海峰
曹天植
李长宇
黄天啸
刘瑛琳
卢文清
易姝娴
辛光明
张广韬
赵焱
秦川
史扬
罗婧
郝婧
夏雪
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a synchronous stability verification method and device of a combined system of new energy and a camera, and relates to the technical field of new energy. The method comprises the following steps: calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter; and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared. The apparatus performs the above method. The method and the device provided by the embodiment of the invention can accurately check the synchronization stability of the combined system of the new energy and the camera.

Description

Synchronous stability verification method and device for new energy and camera-adjusting combined system
Technical Field
The invention relates to the technical field of new energy, in particular to a synchronous stability verification method and device of a combined system of new energy and a camera.
Background
At present, with the increase of the installed capacity of new energy, the local part of a power grid at a transmitting end is characterized by a low short-circuit ratio weak power grid, and the problem of voltage out-of-limit and broadband oscillation easily occurs when a large-scale new energy base is remotely transmitted, so that a new energy unit is off-grid. In order to improve the voltage supporting capability of the new energy base, a camera with a certain capacity is arranged in a near zone of the new energy base, so that the new energy base is widely applied.
In the prior art, the distributed camera is connected into the new energy station, so that the voltage supporting strength of the power grid can be effectively improved, and the broadband oscillation of the new energy can be inhibited. When the new energy base is sent out through the direct current system, the centralized camera is arranged at the sending-end converter station, so that the risk of off-grid of the new energy due to overvoltage is reduced. The capacity and the position of the distributed and centralized cameras are reasonably selected, so that the new energy consumption capability is improved.
Unlike traditional synchronous units, the phase-change machine is usually used as a special synchronous motor which only generates reactive power, and when the phase-change machine is singly connected to a passive node of a system, the problem of power angle instability caused by unbalance of mechanical power and electromagnetic power does not exist when the system is in fault. However, when the camera is connected to a large new energy base, the power angle characteristics of the camera are changed, and the influence of wind power on the power angle characteristics of the synchronous unit is similar to that of wind power under the wind power and fire bundling combined outgoing scene. Under the wind-fire bundling combined transmission scene, as wind power occupies a transmission channel, the power angle curve of the synchronous machine moves downwards when the infinite bus phase is used as a reference. The camera may also have transient power angle instability problems under failure. Compared with a synchronous machine set, the inertia of the idling camera is smaller, and the problem of power angle instability is more serious, so that the problem of power angle instability of the new energy post-adjustment camera is necessary to be considered.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a synchronous stability verification method and device for a combined system of new energy and a camera, which can at least partially solve the problems in the prior art.
On one hand, the invention provides a synchronous stability verification method of a combined system of a new energy source and a camera, which comprises the following steps:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
The power grid parameters comprise equivalent connection reactance between a public coupling point, to which a new energy source and a regulator are connected through a step-up transformer, and an infinite bus;
Correspondingly, the calculating the short-circuit ratio of the equivalent synchronous unit to the combined system according to the new energy active power and the power grid parameter comprises the following steps:
And taking the inverse of the product of the active power of the new energy and the equivalent contact reactance as the short-circuit ratio.
Wherein,
The power grid parameters comprise a preset static stable reserve coefficient and a transient potential amplitude of an equivalent transient reactance of a phase-change modulator, and the related parameters of the combined system comprise the equivalent transient reactance of the phase-change modulator, a phase-change modulator capacity, a capacity conversion coefficient of a new energy source and a synchronous unit and a new energy source active power;
correspondingly, the calculating the critical short-circuit ratio according to the related parameters of the combined system and the power grid parameters comprises the following steps:
And calculating a critical short-circuit ratio according to the preset static stable reserve coefficient, the transient potential amplitude, the equivalent transient reactance of the regulator, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy.
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
And calculating the preset static stable reserve coefficient according to a constant C, the capacity of the camera, the equivalent connection reactance between a public coupling point which is accessed after the camera and the camera are respectively connected through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy.
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
and taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit.
The checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing comprises the following steps:
And checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing by using an equal area rule transient stability checking method.
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
And if the short circuit ratio is greater than or equal to the critical short circuit ratio, generating a prompt message for reinforcing the risk of synchronous instability.
On one hand, the invention provides a synchronous stability checking device of a combined system of new energy and a camera, which comprises the following components:
The first calculation unit is used for calculating the active power output by the steady-state time-setting camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
The second calculation unit is used for calculating the short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameters, and calculating the critical short-circuit ratio according to the related parameters of the combined system and the power grid parameters;
And the verification unit is used for verifying the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared if the short circuit ratio is determined to be smaller than the critical short circuit ratio.
In yet another aspect, an embodiment of the present invention provides a computer device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following method when executing the computer program:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
An embodiment of the present invention provides a computer-readable storage medium including:
The computer readable storage medium stores a computer program which, when executed by a processor, performs the following method:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, performs the following method:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
According to the synchronous stability verification method and device for the combined system of the new energy and the camera, the active power output by the camera in steady state is calculated according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter; if the short-circuit ratio is smaller than the critical short-circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared, and accurately checking the synchronous stability of the combined system of the new energy and the camera.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
Fig. 1 is a flow chart of a method for verifying synchronization stability of a combined system of a new energy source and a camera according to an embodiment of the present invention.
Fig. 2 is a flow chart of a method for verifying synchronization stability of a combined system of a new energy source and a camera according to another embodiment of the present invention.
Fig. 3 is a schematic diagram of a combined system power angle instability waveform according to an embodiment of the present invention.
Fig. 4 is a schematic waveform diagram of new energy provided by the embodiment of the invention under critical capacity without occurrence of synchronization instability.
Fig. 5 is a schematic diagram of a power angle waveform of a new energy source above a critical capacity for generating synchronous instability according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a synchronous stability checking device of a combined system of a new energy source and a camera according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a physical structure of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present application and their descriptions herein are for the purpose of explaining the present application, but are not to be construed as limiting the application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
Fig. 1 is a flow chart of a method for verifying synchronization stability of a combined system of a new energy source and a camera according to an embodiment of the present invention, as shown in fig. 1, where the method for verifying synchronization stability of a combined system of a new energy source and a camera according to an embodiment of the present invention includes:
step S1: calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power.
Step S2: and calculating the short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating the critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter.
Step S3: and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
In the step S1, the device calculates the active power output by the steady-state time-setting camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power. The apparatus may be a computer device or the like, for example a server, performing the method. The technical scheme of the application obtains, stores, uses, processes and the like the data, which all meet the relevant regulations of national laws and regulations.
The power grid parameters comprise transient potential amplitude E' of an equivalent transient reactance X sc of the phase-regulating machine, infinite bus voltage amplitude U 0, an equivalent connection reactance X g between a public coupling point, to which the new energy source and the phase-regulating machine are connected after the phase-regulating machine passes through the step-up transformer, and the infinite bus.
The related parameters of the combined system comprise active power P sc output by a steady-state time-varying camera, the capacity S sc of the time-varying camera and a constant C which meet a relation S scXsc =C; the power angle delta sc of the camera, the phase deviation delta (P w,Qw) of the power angle of the camera caused by the new energy after the new energy is accessed, the amplitude deviation delta P (P w,Qw) of the active power of the power angle of the camera caused by the new energy after the new energy is accessed, the new energy active power P w and the new energy reactive power Q w; correspondingly, the active power P sc output by the steady-state time-varying camera is calculated by the following formula:
The content of the formula can be referred to the above description, and will not be repeated. The formula is a model representing a combined system of new energy and a camera.
When Q w =0, the active power P sc output by the steady state time adjustment camera is calculated according to the following formula:
The content of the formula can be referred to the above description, and will not be repeated. X represents X sc and X g in parallel.
In the step S2, the device calculates a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculates a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter. The power grid parameters comprise equivalent connection reactance between a public coupling point to which a new energy source and a regulator are connected through a step-up transformer and an infinite bus;
Correspondingly, the calculating the short-circuit ratio of the equivalent synchronous unit to the combined system according to the new energy active power and the power grid parameter comprises the following steps:
And taking the inverse of the product of the active power of the new energy and the equivalent contact reactance as the short-circuit ratio. Namely, the short-circuit ratio γ SCR0 is calculated by the following formula:
the content of the formula can be referred to the above description, and will not be repeated.
The power grid parameters comprise a preset static stable reserve coefficient and a transient potential amplitude of an equivalent transient reactance of a phase-change modulator, and the related parameters of the combined system comprise the equivalent transient reactance of the phase-change modulator, a phase-change modulator capacity, a capacity conversion coefficient of a new energy source and a synchronous unit and a new energy source active power;
correspondingly, the calculating the critical short-circuit ratio according to the related parameters of the combined system and the power grid parameters comprises the following steps:
And calculating a critical short-circuit ratio according to the preset static stable reserve coefficient eta 0, the transient potential amplitude E', the camera equivalent transient reactance X SC, the camera capacity S SC, the new energy and synchronous unit capacity conversion coefficient alpha and the new energy active power P w. Namely, the critical short ratio γ CSCR is calculated by the following formula:
the content of the formula can be referred to the above description, and will not be repeated.
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
Calculating the preset static stable reserve coefficient according to a constant C, a capacity of a camera, an equivalent connection reactance between a public coupling point which is accessed by the new energy and the camera after passing through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, the capacity conversion coefficient of the new energy and a synchronous unit and the active power of the new energy, namely calculating the preset static stable reserve coefficient through the following formula:
the content of the formula can be referred to the above description, and will not be repeated.
Wherein, the deduction process of the formula is as follows:
P max is an intermediate variable, and P SCE is active power output by the equivalent tone camera; for other contents in the formula, reference may be made to the above description, and no further description is given.
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
And taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit. The capacity conversion coefficient alpha of the new energy and the synchronous unit is calculated by the following formula:
Wherein, P TE is equivalent mechanical power, which can be calculated according to the following formula:
the content of the formula can be referred to the above description, and will not be repeated.
In the step S3, if the device determines that the short-circuit ratio is smaller than the critical short-circuit ratio, the device checks the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared. As shown in fig. 2, if the short-circuit ratio is less than the critical short-circuit ratio, i.e., the short-circuit ratio condition is met, it is indicated that the combined system is not at risk of instability.
If the short circuit ratio is greater than or equal to the critical short circuit ratio, namely the short circuit ratio condition is not met, the combined system is indicated to have the instability risk, and a prompt message for reinforcing the synchronous instability risk can be generated so as to enable related personnel to take countermeasures in time.
The checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing comprises the following steps:
And checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing by using an equal area rule transient stability checking method.
The description is as follows:
If S ac≤Sde is satisfied, the synchronization stability check is passed, otherwise, the synchronization stability check is not passed.
Specifically, the acceleration area S ac after the occurrence of the failure is:
Sac＝Pw(δc-δ0)
Wherein, delta 0 is the stable operating point of the power angle of the camera when the input mechanical power is zero, delta c is the power angle at the moment of fault removal, and the power angle is calculated according to the following formula:
Where Δt is the fault duration and ω n is the system nominal angular frequency. C' satisfies the following relationship:
wherein T J is the camera inertia time constant.
The deceleration area after fault clearing is as follows:
And the active power output by the camera is zero, namely the unstable balance point delta u.Pscu of the combined system can be obtained to be the active power output by the camera after the fault is cleared, and the calculation method is the same as the calculation method P SC, and represents the active power output by the camera in the stage time after the fault is cleared.
The method of the embodiment of the invention is specifically implemented and explained as follows:
In order to analyze electromagnetic transient characteristics of the combined system, the combined system is built based on an MATLAB/Simulink platform, rated capacity of a single distributed type camera is 50MVA, and capacity of camera access can be changed by changing the number of cameras connected in parallel. The actual access capacity of the new energy can be changed by adjusting the number of the parallel networks.
Firstly, the phase modulator can be verified from the dimension of small interference stability to improve the strength of the power grid. As shown in table 1:
TABLE 1
When the camera is not connected, the short circuit ratio of the system is 1.389 by adjusting X g; when the camera is connected, the system short-circuit ratio is raised to 3.336. A small disturbance of voltage was applied to the common connection point (PCC point) for a duration of 0.05s when the simulation had run time t=0.2 s. When the camera is not connected, new energy under the weak power grid is subjected to oscillation instability due to small disturbance. After the camera is connected, the system short circuit ratio is improved by 1.947, and the voltage waveform is quickly converged after the small disturbance occurs, so that the connection of the camera effectively improves the power grid strength of the system. However, since the system short-circuit ratio before the camera is accessed is smaller than the critical short-circuit ratio, the combined system still has a transient power angle instability risk.
In order to verify the power angle stability characteristic of the combined system, the combined system is built on the basis of an electromechanical simulation software PSD-BPA platform, and simulation parameters are the same as those of the MATLAB/Simulink platform. Three-phase short-circuit faults are set to occur on an infinite bus, and the simulated running time is t=1s, and the fault duration Δt=0.1s.
As can be seen from fig. 3, rad in fig. 3 is radian, pu is per unit value, and when the active power of the new energy source is higher before the fault, the transient power angle instability phenomenon of the combined system occurs. At this time, the new energy does not enter the low voltage ride through state, the active power output by the phase-change regulator is basically unchanged, the active power output by the phase-change regulator during the fault period is a negative value, the absolute value of the active power is just the output power of the new energy, and the absolute value is consistent with the analysis result that the active power of the new energy is injected into the phase-change regulator during the fault period in theory.
At the time when the simulation has been run for t=1s, the fault duration Δt=0.1s, the critical capacity Pw' of the new energy source obtainable by the simulation is 1.101p.u., and the simulation value of γ CSCR is 1.513. Solving the problem that the critical capacity of the new energy source is 1.051p.u. when the system is critical and stable, the analysis value of gamma CSCR is 1.586, and the steady reserve coefficient of the equivalent synchronous machine is 33.7%. The main reason for the difference between the two is that the power outer loop and current inner loop dynamic processes of the new energy source are ignored during the fault. And the error between them is only about 5%.
As shown in fig. 4, when the active power of the new energy source is 1.10p.u., the combined system fails, a new stable operating point can be reached. As shown in FIG. 5, when the active power of the new energy source is 1.11p.u., the transient power angle instability phenomenon occurs in the combined system after the fault.
Therefore, the time domain simulation proves that the short-circuit ratio requirement of the system before the camera is connected in a certain working condition is about 1.5. This indicates that when the camera is connected to a system with a short-circuit ratio less than 1.5, the transient power angle stability may rise as one of the main constraint conditions, and the camera will not be able to perform the function of improving the new energy carrying capacity. In order to fully play the function of the camera, new energy and parameters such as capacity, inertia time constant and the like of the camera are further controlled when the weak current network is planned, so that transient power angle instability of the camera under the weak current network is avoided.
According to the synchronous stability verification method of the combined system of the new energy and the camera, the active power output by the camera in steady state is calculated according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter; if the short-circuit ratio is smaller than the critical short-circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared, and accurately checking the synchronous stability of the combined system of the new energy and the camera.
Further, the power grid parameters comprise equivalent connection reactance between a public coupling point, to which the new energy source and the regulator are connected after passing through the step-up transformer, and an infinite bus;
Correspondingly, the calculating the short-circuit ratio of the equivalent synchronous unit to the combined system according to the new energy active power and the power grid parameter comprises the following steps:
and taking the inverse of the product of the active power of the new energy and the equivalent contact reactance as the short-circuit ratio. Reference is made to the above description and will not be repeated.
Further, the power grid parameters comprise transient potential amplitude values of preset static stable reserve coefficients and transient state reactance equivalent to a regulator, and the related parameters of the combined system comprise transient state reactance equivalent to the regulator, capacity of the regulator, capacity conversion coefficients of new energy and synchronous units and new energy active power;
correspondingly, the calculating the critical short-circuit ratio according to the related parameters of the combined system and the power grid parameters comprises the following steps:
and calculating a critical short-circuit ratio according to the preset static stable reserve coefficient, the transient potential amplitude, the equivalent transient reactance of the regulator, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy. Reference is made to the above description and will not be repeated.
Further, the synchronization stability verification method of the combined system of the new energy and the camera further comprises the following steps:
And calculating the preset static stable reserve coefficient according to a constant C, the capacity of the camera, the equivalent connection reactance between a public coupling point which is accessed after the camera and the camera are respectively connected through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy. Reference is made to the above description and will not be repeated.
Further, the synchronization stability verification method of the combined system of the new energy and the camera further comprises the following steps:
and taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit. Reference is made to the above description and will not be repeated.
Further, the verifying the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing comprises:
and checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing by using an equal area rule transient stability checking method. Reference is made to the above description and will not be repeated.
Further, the synchronization stability verification method of the combined system of the new energy and the camera further comprises the following steps:
And if the short circuit ratio is greater than or equal to the critical short circuit ratio, generating a prompt message for reinforcing the risk of synchronous instability. Reference is made to the above description and will not be repeated.
Fig. 6 is a schematic structural diagram of a synchronization stability verification device of a combined system of a new energy source and a camera according to an embodiment of the present invention, as shown in fig. 6, where the synchronization stability verification device of a combined system of a new energy source and a camera according to an embodiment of the present invention includes a first calculation unit 601, a second calculation unit 602, and a verification unit 603, where:
The first calculation unit 601 is configured to calculate active power output by the steady-state time-adjustment camera according to the relevant parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; the second calculating unit 602 is configured to calculate a short-circuit ratio of the equivalent synchronous unit to access the combined system according to the active power of the new energy and the grid parameter, and calculate a critical short-circuit ratio according to the related parameter of the combined system and the grid parameter; and the verification unit 603 is configured to verify the limit value of the active power of the new energy according to the related parameter of the combined system, the power grid parameter and the active power output by the camera after the fault is cleared if the short-circuit ratio is determined to be smaller than the critical short-circuit ratio.
Specifically, a first calculating unit 601 in the device is configured to calculate, according to the related parameters of the combined system and the power grid parameters, active power output by the steady-state time adjustment camera; the related parameters of the combined system comprise new energy active power; the second calculating unit 602 is configured to calculate a short-circuit ratio of the equivalent synchronous unit to access the combined system according to the active power of the new energy and the grid parameter, and calculate a critical short-circuit ratio according to the related parameter of the combined system and the grid parameter; and the verification unit 603 is configured to verify the limit value of the active power of the new energy according to the related parameter of the combined system, the power grid parameter and the active power output by the camera after the fault is cleared if the short-circuit ratio is determined to be smaller than the critical short-circuit ratio.
According to the synchronous stability verification device of the combined system of the new energy and the camera, the active power output by the camera in steady state is calculated according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter; if the short-circuit ratio is smaller than the critical short-circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared, and accurately checking the synchronous stability of the combined system of the new energy and the camera.
Further, the power grid parameters comprise equivalent connection reactance between a public coupling point, to which the new energy source and the regulator are connected after passing through the step-up transformer, and an infinite bus;
accordingly, the second computing unit 602 is specifically configured to:
And taking the inverse of the product of the active power of the new energy and the equivalent contact reactance as the short-circuit ratio.
Further, the power grid parameters comprise transient potential amplitude values of preset static stable reserve coefficients and transient state reactance equivalent to a regulator, and the related parameters of the combined system comprise transient state reactance equivalent to the regulator, capacity of the regulator, capacity conversion coefficients of new energy and synchronous units and new energy active power;
accordingly, the second computing unit 602 is specifically configured to:
And calculating a critical short-circuit ratio according to the preset static stable reserve coefficient, the transient potential amplitude, the equivalent transient reactance of the regulator, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy.
The synchronous stability verification device of the combined system of the new energy and the camera is also used for:
And calculating the preset static stable reserve coefficient according to a constant C, the capacity of the camera, the equivalent connection reactance between a public coupling point which is accessed after the camera and the camera are respectively connected through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, the capacity conversion coefficient of the new energy and the synchronous unit and the active power of the new energy.
The synchronous stability verification device of the combined system of the new energy and the camera is also used for:
and taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit.
Further, the verification unit 603 is specifically configured to:
And checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after fault clearing by using an equal area rule transient stability checking method.
Further, the synchronous stability checking device of the combined system of the new energy and the camera is specifically used for:
And if the short circuit ratio is greater than or equal to the critical short circuit ratio, generating a prompt message for reinforcing the risk of synchronous instability.
The embodiment of the synchronization stability verification device of the combined system of the new energy source and the camera provided by the embodiment of the invention can be particularly used for executing the processing flow of each method embodiment, and the functions of the synchronization stability verification device are not repeated herein, and can be referred to the detailed description of the method embodiments.
Fig. 7 is a schematic diagram of an entity structure of a computer device according to an embodiment of the present invention, as shown in fig. 7, where the computer device includes: memory 701, processor 702, and a computer program stored on memory 701 and executable on processor 702, which processor 702 when executing the computer program implements the method of:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
The present embodiment discloses a computer program product comprising a computer program which, when executed by a processor, implements the method of:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
The present embodiment provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of:
Calculating the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power;
Calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter;
and if the short circuit ratio is smaller than the critical short circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared.
Compared with the technical scheme in the prior art, the embodiment of the invention calculates the active power output by the steady-state time-adjustment camera according to the related parameters of the combined system and the power grid parameters; the related parameters of the combined system comprise new energy active power; calculating a short-circuit ratio of the equivalent synchronous unit to the combined system according to the active power of the new energy and the power grid parameter, and calculating a critical short-circuit ratio according to the related parameter of the combined system and the power grid parameter; if the short-circuit ratio is smaller than the critical short-circuit ratio, checking the limit value of the active power of the new energy according to the related parameters of the combined system, the power grid parameters and the active power output by the camera after the fault is cleared, and accurately checking the synchronous stability of the combined system of the new energy and the camera.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present specification, reference to the terms "one embodiment," "one particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (6)

1. A synchronous stability verification method of a new energy and camera combination system is characterized by comprising the following steps:
Satisfying the relation S scXsc =c according to the constant C including the camera capacity S sc; the method comprises the steps of calculating the active power output by a camera in a steady state according to a power angle delta sc of the camera, a phase shift delta (P w,Qw) of the power angle of the camera caused by the access of a new energy, an amplitude shift delta P (P w,Qw) of the active power of the power angle of the camera caused by the access of the new energy, a combined system related parameter of the active power P w of the new energy and the reactive power Q w of the new energy, a transient potential amplitude E' comprising an equivalent transient reactance X sc of the camera, an infinite bus voltage amplitude U 0, and a power grid parameter of an equivalent connection reactance X g between a public coupling point of the access of the new energy and the camera after the access of the booster transformer;
Taking the reciprocal of the product of the active power of the new energy and the equivalent contact reactance X g as a short-circuit ratio; calculating a critical short-circuit ratio according to the related parameters of a combined system comprising an equivalent transient reactance of a phase-change regulator, a capacity conversion coefficient of a new energy and a synchronous unit and active power of the new energy and the power grid parameters comprising a preset static stable reserve coefficient and a transient potential amplitude of the equivalent transient reactance of the phase-change regulator;
if the short-circuit ratio is determined to be smaller than the critical short-circuit ratio, satisfying a relation S scXsc =c according to a constant C including a camera capacity S sc; the method comprises the steps of setting a power angle delta sc of a camera, a phase shift delta (P w,Qw) of the power angle of the camera caused after a new energy is connected, a magnitude shift delta P (P w,Qw) of active power of the power angle of the camera caused after the new energy is connected, joint system related parameters of the active power P w of the new energy and the reactive power Q w of the new energy, a transient potential amplitude E' comprising an equivalent transient reactance X sc of the camera, an infinite bus voltage amplitude U 0, a grid parameter of an equivalent connection reactance X g between a public coupling point of the new energy and an infinite bus of the camera after the new energy is connected through a step-up transformer, and checking the limit value of the active power of the new energy after fault clearing;
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
calculating the preset static stable reserve coefficient according to a constant C, a capacity of a camera, an equivalent connection reactance between a public coupling point which is accessed after the camera passes through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, a capacity conversion coefficient of the new energy and a synchronous unit and the active power of the new energy;
The synchronous stability verification method of the combined system of the new energy and the camera also comprises the following steps:
and taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit.
2. The method for verifying the synchronization stability of a combined system of a new energy source and a camera according to claim 1, wherein the relation S scXsc =c is satisfied according to a constant C including a capacity S sc of the camera; the power angle delta sc of the phase-change regulator, the phase shift delta (P w,Qw) of the power angle of the phase-change regulator after the new energy is connected, the amplitude shift delta P (P w,Qw) of the active power of the power angle of the phase-change regulator after the new energy is connected, the related parameters of a combined system of the active power P w of the new energy and the reactive power Q w of the new energy, the transient potential amplitude E' comprising the equivalent transient reactance X sc of the phase-change regulator, the infinite bus voltage amplitude U 0, the equivalent connection reactance X g between the common coupling point of the new energy and the infinite bus after the phase-change regulator is connected through a step-up transformer, and the limit value of the active power of the new energy after the fault is cleared, and the limit value of the active power of the phase-change regulator are verified, and the method comprises the following steps:
The transient stability checking method is utilized by the equal area rule, and the relation S scXsc =C is satisfied according to the parameters including the capacity S sc of the camera and the constant C; the power angle delta sc of the phase-change regulator, the phase shift delta (P w,Qw) of the power angle of the phase-change regulator after the new energy is connected, the amplitude shift delta P (P w,Qw) of the active power of the power angle of the phase-change regulator after the new energy is connected, the related parameters of a combined system of the active power P w of the new energy and the reactive power Q w of the new energy, the transient potential amplitude E' comprising the equivalent transient reactance X sc of the phase-change regulator, the infinite bus voltage amplitude U 0, the equivalent connection reactance X g between the common coupling point of the new energy and the infinite bus after the phase-change regulator is connected through a step-up transformer, and the limit value of the active power of the new energy after the fault is cleared.
3. The synchronization stability verification method of a combined system of a new energy source and a camera according to claim 1, wherein the synchronization stability verification method of a combined system of a new energy source and a camera further comprises:
And if the short circuit ratio is greater than or equal to the critical short circuit ratio, generating a prompt message for reinforcing the risk of synchronous instability.
4. The utility model provides a synchronous stability verifying attachment of combined system of new energy and camera which characterized in that includes:
A first calculation unit for satisfying a relation S scXsc =c according to a constant C including a camera capacity S sc; the method comprises the steps of calculating the active power output by a camera in a steady state according to a power angle delta sc of the camera, a phase shift delta (P w,Qw) of the power angle of the camera caused by the access of a new energy, an amplitude shift delta P (P w,Qw) of the active power of the power angle of the camera caused by the access of the new energy, a combined system related parameter of the active power P w of the new energy and the reactive power Q w of the new energy, a transient potential amplitude E' comprising an equivalent transient reactance X sc of the camera, an infinite bus voltage amplitude U 0, and a power grid parameter of an equivalent connection reactance X g between a public coupling point of the access of the new energy and the camera after the access of the booster transformer;
The second calculation unit is used for taking the reciprocal of the product of the active power of the new energy source and the equivalent contact reactance X g as a short-circuit ratio; calculating a critical short-circuit ratio according to the related parameters of a combined system comprising an equivalent transient reactance of a phase-change regulator, a capacity conversion coefficient of a new energy and a synchronous unit and active power of the new energy and the power grid parameters comprising a preset static stable reserve coefficient and a transient potential amplitude of the equivalent transient reactance of the phase-change regulator;
A verification unit, configured to, if it is determined that the short-circuit ratio is smaller than the critical short-circuit ratio, satisfy a relation S scXsc =c according to a constant C including a camera capacity S sc; the method comprises the steps of setting a power angle delta sc of a camera, a phase shift delta (P w,Qw) of the power angle of the camera caused after a new energy is connected, a magnitude shift delta P (P w,Qw) of active power of the power angle of the camera caused after the new energy is connected, joint system related parameters of the active power P w of the new energy and the reactive power Q w of the new energy, a transient potential amplitude E' comprising an equivalent transient reactance X sc of the camera, an infinite bus voltage amplitude U 0, a grid parameter of an equivalent connection reactance X g between a public coupling point of the new energy and an infinite bus of the camera after the new energy is connected through a step-up transformer, and checking the limit value of the active power of the new energy after fault clearing;
The synchronous stability verification device of the combined system of the new energy and the camera is also used for:
calculating the preset static stable reserve coefficient according to a constant C, a capacity of a camera, an equivalent connection reactance between a public coupling point which is accessed after the camera passes through a step-up transformer and an infinite bus, the transient potential amplitude, the infinite bus voltage amplitude, a capacity conversion coefficient of the new energy and a synchronous unit and the active power of the new energy;
The synchronous stability verification device of the combined system of the new energy and the camera is also used for:
and taking the ratio of the equivalent mechanical power to the active power of the new energy as the capacity conversion coefficient of the new energy and the synchronous unit.
5. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 3 when executing the computer program.
6. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method of any of claims 1 to 3.
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