CN219760647U - Broadband oscillation telecontrol monitoring control device for new energy power transmission system - Google Patents
Broadband oscillation telecontrol monitoring control device for new energy power transmission system Download PDFInfo
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Abstract
The utility model relates to the technical field of power systems, in particular to a broadband oscillation telecontrol monitoring control device of a new energy power transmission system, which comprises the following components: the first calculation module is used for calculating first equivalent admittances corresponding to the new energy unit groups in all modes; the second calculation module is used for calculating second equivalent admittances corresponding to all modes; and the control module is used for judging that the broadband oscillation stability problem does not exist at the corresponding monitoring point when the real part of the second equivalent admittance corresponding to all modes is larger than zero, otherwise, judging that the broadband oscillation risk exists. The embodiment of the utility model can acquire the node data of the power transmission system in real time to monitor the potential risk of broadband oscillation, thereby effectively inhibiting the broadband oscillation of the node, leading the broadband oscillation monitoring to be more targeted, ensuring the safe and stable operation of the power system and being more efficient.
Description
Technical Field
The utility model relates to the technical field of power systems, in particular to a broadband oscillation telecontrol monitoring control device of a new energy power transmission system.
Background
The new energy generator sets such as wind power, photovoltaic and the like have special requirements on site selection of the station, so that most of the new energy generator sets are connected into a power grid through a line with a certain length, and part of broadband oscillation problems can penetrate through a long-distance wide-area power grid to influence stability.
In the related art, the new energy station can realize on-site monitoring or perform wide-area monitoring towards a power system or a regional power grid.
However, the related technology cannot realize the telemechanical monitoring and control of the broadband oscillation of the new energy power transmission system, is difficult to effectively prevent the negative influence of the broadband oscillation from spreading in a large area in the power grid, cannot ensure the safety and stable operation of the novel power system equipment, reduces the efficiency of finding and inhibiting the broadband oscillation of the power transmission system, has insufficient safety, and needs to be solved urgently.
Disclosure of Invention
The utility model provides a broadband oscillation telemechanical monitoring control device of a new energy power transmission system, which aims to solve the problems that the prior art cannot realize telemechanical monitoring and control on the broadband oscillation of the new energy power transmission system, the negative influence of the broadband oscillation is difficult to effectively prevent from spreading in a large area in a power grid, the safety and stable operation of novel power system equipment cannot be ensured, the efficiency of finding and inhibiting the broadband oscillation problem of the power transmission system is reduced, the safety is insufficient and the like.
The utility model provides a broadband oscillation telecontrol monitoring control device of a new energy power transmission system, which comprises: the first calculation module is used for collecting broadband voltage measurement data of the bus of the new energy station and broadband current phasor measurement data of the feeder line of the new energy unit group at intervals of a preset period so as to calculate first equivalent admittances corresponding to the new energy unit groups in all modes; the control module is connected with the second calculation module and is used for collecting bus broadband voltage phasors corresponding to all modes at monitoring points of the power transmission line and broadband current phasors of the power transmission line of the new energy station so as to calculate second equivalent admittances corresponding to all modes and judging whether the real parts of the second equivalent admittances corresponding to all modes are larger than zero or not; and the control module is connected with the second calculation module and is used for judging that the broadband oscillation stability problem does not exist at the corresponding monitoring point when the real part of the second equivalent admittance corresponding to all modes is larger than zero, or judging that the broadband oscillation risk exists at the frequency corresponding to the mode with the real part smaller than or equal to zero at the corresponding monitoring point.
Specifically, the control module is further used for switching a unit in the remote new energy station so as to optimize broadband oscillation stability of the corresponding monitoring point according to the first equivalent admittance of the previous period.
Specifically, the calculation formula of the first equivalent admittance is:
wherein Y is ik For the equivalent admittance corresponding to the kth mode of the ith new energy unit group feeder,broadband voltage phasors of buses corresponding to kth mode of new energy station are +.>The method comprises the steps of providing broadband current phasors corresponding to the kth mode of a new energy unit group feeder i, wherein i=1, m, k=1, n, m is the total number of new energy unit group feeders of a bus, and n is the total number of modes of the bus.
Specifically, the calculation formula of the second equivalent admittance is:
wherein Y is 0k Is the equivalent admittance at the monitoring point of the transmission line corresponding to the kth mode,broadband current phasors of new energy station transmission lines corresponding to the kth mode are +.>And (3) obtaining broadband voltage phasors of the bus at monitoring points of the power transmission line corresponding to the kth mode, wherein k=1.
Specifically, in one embodiment of the present utility model, the optimization objective of the broadband oscillation stability is:
wherein Y is 0k For the equivalent admittance at the transmission line monitoring point corresponding to the kth mode, nc is the number of the feeder lines of the new energy unit group which are cut off, k=1.
Optionally, the control module includes: and the cutting unit is used for selecting and cutting off the new energy unit group with the minimum real part in the equivalent admittance corresponding to the mode with the real part smaller than or equal to zero according to the first equivalent admittance of the previous period.
In addition, the device further comprises: the new energy unit group admittance measuring device is connected with the first calculation module to acquire the new energy station bus broadband voltage measurement data and the new energy unit group feeder broadband current phasor measurement data
The method and the system can acquire the node data of the power transmission system in real time to monitor the potential risk of broadband oscillation, thereby effectively inhibiting the broadband oscillation of the node, leading the broadband oscillation monitoring to be more targeted, ensuring the safe and stable operation of the power system and being more efficient. Therefore, the problems that the related technology cannot realize telemechanical monitoring and control of broadband oscillation of a new energy power transmission system, is difficult to effectively prevent the negative influence of the broadband oscillation from spreading in a large area in a power grid, cannot ensure the safety and stable operation of novel power system equipment, reduces the efficiency of finding and inhibiting the broadband oscillation of the power transmission system, and is insufficient in safety are solved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a broadband oscillation telecontrol monitoring control device of a new energy power transmission system according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a new energy power transmission broadband oscillation telecontrol monitoring control system according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a process of broadband oscillation telecontrol monitoring control of a new energy power transmission system according to an embodiment of the present utility model;
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
The broadband oscillation telemechanical monitoring control device of the new energy power transmission system of the embodiment of the utility model is described below with reference to the accompanying drawings. Aiming at the problems that the related technology mentioned in the background art cannot realize the telemechanical monitoring and control of the broadband oscillation of the new energy power transmission system, is difficult to effectively prevent the negative influence of the broadband oscillation from spreading in a large area in a power grid, cannot guarantee the safety and stable operation of novel power system equipment, reduces the efficiency of finding and inhibiting the broadband oscillation problem of the power transmission system and the problem of insufficient safety, the utility model provides the telemechanical monitoring and control method of the broadband oscillation of the new energy power transmission system, which can acquire the node data of the power transmission system in real time, and switch a unit in a remote new energy station when the broadband oscillation problem or potential risk is monitored, thereby effectively inhibiting the broadband oscillation of the node, leading the broadband oscillation optimization of a monitoring point to have more pertinence, and guaranteeing the safe and stable operation of the power system. Therefore, the problems that the related technology cannot realize telemechanical monitoring and control of broadband oscillation of a new energy power transmission system, is difficult to effectively prevent the negative influence of the broadband oscillation from spreading in a large area in a power grid, cannot ensure the safety and stable operation of novel power system equipment, reduces the efficiency of finding and inhibiting the broadband oscillation of the power transmission system, and is insufficient in safety are solved.
Specifically, fig. 1 is a schematic structural diagram of a broadband oscillation telecontrol device for a new energy power transmission system according to an embodiment of the present utility model.
As shown in fig. 1, the broadband oscillation telemonitoring control device 10 of the new energy transmission system includes: a first computing module 100, a second computing module 200, and a control module 300.
The first calculation module 100 is configured to collect broadband voltage measurement data of the new energy station bus and broadband current phasor measurement data of the new energy unit group feeder line at intervals of a preset period, so as to calculate first equivalent admittances corresponding to each new energy unit group in each mode.
It can be understood that in the embodiment of the utility model, broadband voltage measurement data of the new energy station bus and broadband current phasor measurement data of the new energy unit group feeder line can be collected and measured at regular intervals through an equivalent admittance measurer.
It should be noted that the preset period is set by a person skilled in the art according to the actual situation, and is not specifically limited herein.
In some embodiments, an equivalent admittance measurer may be installed in the new energy station, and the measured broadband voltage measurement data of the bus of the new energy station and the measured broadband current phasor measurement data of the feeder line of the new energy unit group are collected at regular intervals, and the equivalent admittances corresponding to the new energy unit groups in each mode are calculated to obtain the first equivalent admittance.
The embodiment of the utility model can acquire broadband voltage measurement data of the bus of the new energy station and broadband current phasor measurement data of the feeder line of the new energy unit group at intervals of a preset period so as to calculate the first equivalent admittance corresponding to each new energy unit group in each mode, thereby acquiring the monitoring data of the new energy station in a certain time interval and providing a required data basis for the telemechanical monitoring control of the monitoring points of the power transmission system.
Specifically, in one embodiment of the present utility model, the first equivalent admittance is calculated as:
wherein Y is ik For the equivalent admittance corresponding to the kth mode of the ith new energy unit group feeder,broadband voltage phasors of buses corresponding to kth mode of new energy station are +.>The method comprises the steps of providing broadband current phasors corresponding to the kth mode of a new energy unit group feeder i, wherein i=1, m, k=1, n, m is the total number of new energy unit group feeders of a bus, and n is the total number of modes of the bus.
It can be understood that in the embodiment of the utility model, n modes can be provided, and bus broadband voltage phasors corresponding to the kth mode are obtained through the collected new energy station monitoring data as followsThe bus is provided with m new energy unit group feeder lines in total, and broadband current phasors of the new energy unit group feeder line i are obtained according to the collected new energy station monitoring data to be +.>And obtaining a first equivalent admittance result corresponding to each mode of the new energy station through the calculation.
The second calculation module 200 is connected with the first calculation module 100, and is used for collecting the broadband voltage phasors of the bus corresponding to each mode at the monitoring point of the power transmission line and the broadband current phasors of the power transmission line of the new energy station, so as to calculate the second equivalent admittance corresponding to each mode, and judging whether the real part of the second equivalent admittance corresponding to each mode is larger than zero.
It can be understood that in the embodiment of the utility model, the broadband voltage phasors of the bus corresponding to each mode at the monitoring point of the power transmission line and the broadband current phasors of the power transmission line of the new energy station can be obtained through the broadband oscillation telecontrol monitoring controller.
In some embodiments, a broadband oscillation telecontrol monitoring controller is installed at a new energy power transmission line monitoring point to obtain broadband voltage phasors of buses and broadband current phasors of a new energy station power transmission line corresponding to all modes at the power transmission line monitoring point in real time, calculate equivalent admittances corresponding to all modes at the new energy power transmission line monitoring point to obtain a second equivalent admittance result, and judge whether the equivalent admittance with the real part larger than zero exists.
The embodiment of the utility model can acquire the broadband voltage phasors of the bus corresponding to each mode at the monitoring point of the power transmission line and the broadband current phasors of the power transmission line of the new energy station so as to calculate the second equivalent admittance corresponding to each mode and judge whether the real part of the second equivalent admittance corresponding to each mode is greater than zero, thereby acquiring the broadband oscillation condition of the monitoring point by calculation based on the actual monitoring data at the monitoring point of the new energy power transmission line and improving the timeliness and accuracy of monitoring the broadband oscillation of the power transmission line.
Specifically, in one embodiment of the present utility model, the second equivalent admittance is calculated by the formula:
wherein Y is 0k Is the equivalent admittance at the monitoring point of the transmission line corresponding to the kth mode,broadband current phasors of new energy station transmission lines corresponding to the kth mode are +.>And (3) obtaining broadband voltage phasors of the bus at monitoring points of the power transmission line corresponding to the kth mode, wherein k=1.
It may be appreciated that in the embodiment of the present utility model, n modes may be provided, by using the busbar broadband voltage phasors corresponding to each mode at the monitoring point of the power transmission line, the busbar broadband voltage phasors corresponding to the monitoring point of the power transmission line corresponding to the kth mode are obtained, and by using the broadband current phasors of the power transmission line of the new energy station, the broadband current phasors of the power transmission line of the new energy station corresponding to the kth mode are obtained, so that the second equivalent admittance results corresponding to each mode at the monitoring point of the power transmission line are obtained by the calculation of the above formula, and whether the equivalent admittance corresponding to each mode is greater than zero is determined
Re(Y 0k )>0，
Wherein Y is 0k For the equivalent admittance at the transmission line monitoring point corresponding to the kth mode, k=1, 2.
According to the embodiment of the utility model, the real-time data can be used for calculation processing, so that the monitoring data at the monitoring point of the power transmission line can be processed efficiently, and the broadband oscillation stability at the monitoring point of the power transmission line can be further judged.
The control module 300 is connected with the second calculation module 200, and is used for judging that the broadband oscillation stability problem does not exist at the corresponding monitoring point when the real part of the second equivalent admittance corresponding to all modes is larger than zero, or judging that the broadband oscillation risk exists at the frequency corresponding to the mode with the real part smaller than or equal to zero at the corresponding monitoring point.
In the actual execution process, if the real parts of equivalent admittances corresponding to all modes at the monitoring points of the power transmission line are larger than zero, the broadband oscillation stability at the monitoring points meets the requirement, and the next period is monitored. If the real part of the equivalent admittance corresponding to the mode at the monitoring point of the power transmission line is smaller than or equal to zero, the risk of broadband oscillation stability of the monitoring point of the power transmission line is judged, namely broadband oscillation can occur in the mode corresponding to the mode at the monitoring point of the power transmission line, wherein the real part of the equivalent admittance is smaller than or equal to zero.
According to the embodiment of the utility model, when the real part of the second equivalent admittance corresponding to all modes is larger than zero, the problem of broadband oscillation stability at the corresponding monitoring point is judged, otherwise, the risk of broadband oscillation is judged, so that the equipment safety and stable operation of the novel power system are ensured, and the practicability is higher.
Specifically, in one embodiment of the present utility model, the control module 300 is further configured to switch the unit in the remote new energy station to optimize the broadband oscillation stability of the corresponding monitoring point according to the first equivalent admittance of the previous period.
Specifically, in one embodiment of the present utility model, the optimization objective of broadband oscillation stability is:
wherein Y is 0k For the equivalent admittance at the monitoring point of the transmission line corresponding to the kth mode, N c For the number of new energy unit group feeder lines cut off, k=1.
From the above, the optimization objective is that the equivalent admittance at the monitoring points of the power transmission line corresponding to each mode is larger than zero, and the number of the cut-off new energy unit group feeder lines is kept to be the minimum value, so that the broadband oscillation stability of the monitoring points is effectively improved and the safety and stability of the power system are maintained under the condition that the minimum number of the cut-off new energy unit group feeder lines are ensured.
Optionally, in one embodiment of the present utility model, the control module 300 includes: and a cutting unit.
And the cutting-off unit is used for selecting and cutting off the new energy unit group with the minimum real part in the equivalent admittance corresponding to the mode with the real part smaller than or equal to zero according to the first equivalent admittance of the previous period.
In the actual execution process, the new energy unit group with the smallest real part in the equivalent admittance corresponding to the mode can be cut off by combining the first equivalent admittances corresponding to the new energy unit groups in each mode in the new energy station updated in the previous period, wherein the real part of the equivalent admittance at the monitoring point of the power transmission line is smaller than or equal to the mode corresponding to zero, namely
min[Re(Y ip )]i＝1，2，...，m
Wherein Y is ik And (3) the equivalent admittance corresponding to the kth mode of the ith new energy unit group feeder line, i=1. And cutting off the corresponding new energy unit group, and monitoring the next period after the broadband oscillation stability of the monitoring point meets the requirement.
The embodiment of the utility model can select and cut off the new energy machine group with the smallest real part in the equivalent admittance corresponding to the mode with the real part smaller than or equal to zero according to the first equivalent admittance of the previous period, thereby effectively reducing the number of the cut-off new energy machine group feeder lines, further maintaining the stable operation of the power system,
in addition, in one embodiment of the present utility model, the method further includes: the new energy unit group admittance measuring device is connected with the first calculation module 100 to acquire the new energy station bus broadband voltage measurement data and the new energy unit group feeder broadband current phasor measurement data
The working of the embodiment of the present utility model will be described in detail in the following.
Fig. 2 is a schematic structural diagram of a broadband oscillation remote monitoring control system for new energy power transmission according to an embodiment of the present utility model, which includes a broadband oscillation remote monitoring controller ((1)) and a new energy unit group admittance measurer ((2)).
The broadband oscillation telecontrol monitoring controller is used for the following purposes: (a) The broadband oscillation stability monitoring system is used for combining actual measurement data of the bus and the power transmission line of the monitoring point so as to analyze and monitor broadband oscillation stability of the monitoring point. (b) And the device is used for analyzing and controlling the group feeder switch in the new energy station by combining the periodically updated equivalent admittance data of the new energy group after detecting that the monitoring point has the problem of broadband oscillation stability so as to improve the broadband oscillation stability of the monitoring point. The input is divided into two parts: (a) measured data: monitoring point bus broadband voltage phasor data and broadband current phasor data of a new energy station transmission line; (b) periodically updating data: and the new energy unit group admittance measuring device measures and integrates the new energy unit group equivalent admittance data. The output is a control signal for the new energy station group feeder switch.
The new energy unit group admittance measurer has the purposes that: and (3) calculating the equivalent admittance of each new energy machine group at regular intervals delta T based on the bus voltage of the new energy station and the feeder current data of each new energy machine group, and integrating and then sending the equivalent admittance to the step (1). The input of the new energy station bus voltage measurement data and the current measurement data of the feeder lines of each new energy machine group are the equivalent admittance of each new energy machine group at present.
Further, the operation steps of the broadband oscillation telecontrol monitoring control system of the new energy power transmission system are generally divided into two parts which are operated in parallel. And (2) measuring and calculating equivalent admittances corresponding to the new energy unit groups in each mode at intervals of delta T, and transmitting the integrated admittances to (1).
And the second part is arranged at the monitoring point (1), monitors the broadband oscillation stability of the monitoring point based on the input data, and controls the switching of the new energy unit group feeder line when the broadband oscillation stability problem is detected so as to improve the broadband oscillation stability of the monitoring point.
The specific steps are shown in fig. 3, which is a schematic diagram of a process of broadband oscillation telecontrol monitoring control of the new energy power transmission system according to an embodiment of the present utility model.
Step S301: the broadband oscillation telemechanical monitoring controller (1) is arranged at a monitoring point in the system, and the equivalent admittance measurer (2) is arranged in the new energy station.
Step S302: (2) and (3) measuring and calculating equivalent admittances corresponding to the new energy unit groups in each mode at intervals of delta T, and transmitting the integrated admittances to the step (1).
Step S303: (1) measuring broadband voltage phasor measurement data of bus at monitoring point, broadband current phasor measurement data of new energy station transmission line, and calculating equivalent admittance Y corresponding to each mode 0k 。
Step S304: judging the equivalent admittance Y corresponding to each mode 0k Whether the real part is greater than 0. If both conditions are satisfied, step S306 is performed. If the real part of admittance is not greater than zero, the monitoring point is considered to have a broadband oscillation risk on the frequency corresponding to the mode p, and the broadband oscillation stability of the monitoring point needs to be optimized, so that step S305 is executed.
Step S305: combining new energy station data updated in the previous period, cutting off Re (Y) ip ) And outputting a cut-off control signal to a controller of the new energy station by the minimum new energy unit group feeder line, and performing step S303.
Step S306: the broadband oscillation stability of the new energy power transmission system is considered to meet the requirement and the next period is monitored.
According to the broadband oscillation telecontrol monitoring control device for the new energy power transmission system, which is provided by the embodiment of the utility model, the node data of the power transmission system can be obtained in real time to monitor the potential risk of broadband oscillation, so that the broadband oscillation of the node is effectively inhibited, the broadband oscillation monitoring is more targeted, and the safe and stable operation of the power system is ensured to be more efficient. . Therefore, the problems that the related technology cannot realize telemechanical monitoring and control of broadband oscillation of a new energy power transmission system, is difficult to effectively prevent the negative influence of the broadband oscillation from spreading in a large area in a power grid, cannot ensure the safety and stable operation of novel power system equipment, reduces the efficiency of finding and inhibiting the broadband oscillation of the power transmission system, and is insufficient in safety are solved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 at least one such feature. In the description of the present utility model, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present utility model.
Claims (7)
1. A broadband oscillation telecontrol monitoring control device of a new energy power transmission system is characterized by comprising:
the first calculation module is used for collecting broadband voltage measurement data of the bus of the new energy station and broadband current phasor measurement data of the feeder line of the new energy unit group at intervals of a preset period so as to calculate first equivalent admittances corresponding to the new energy unit groups in all modes;
the second calculation module is connected with the first calculation module to acquire bus broadband voltage phasors corresponding to all modes at monitoring points of the power transmission line and broadband current phasors of the power transmission line of the new energy station, so as to calculate second equivalent admittances corresponding to all modes, and judge whether the real parts of the second equivalent admittances corresponding to all modes are larger than zero or not;
and the control module is connected with the second calculation module so as to judge that the broadband oscillation stability problem does not exist at the corresponding monitoring point when the real part of the second equivalent admittance corresponding to all modes is larger than zero, or else, judge that the broadband oscillation risk exists at the frequency corresponding to the mode with the real part smaller than or equal to zero at the corresponding monitoring point.
2. The apparatus of claim 1, wherein the control module is further configured to optimize broadband oscillation stability of the corresponding monitoring point according to the first equivalent admittance of the previous cycle by switching the unit in the remote new energy station.
3. The apparatus of claim 1, wherein the first equivalent admittance is calculated by the formula:
wherein Y is ik For the equivalent admittance corresponding to the kth mode of the ith new energy unit group feeder,broadband voltage phasors of buses corresponding to kth mode of new energy station are +.>The method comprises the steps of providing broadband current phasors corresponding to the kth mode of a new energy unit group feeder i, wherein i=1, m, k=1, n, m is the total number of new energy unit group feeders of a bus, and n is the total number of modes of the bus.
4. The apparatus of claim 1, wherein the second equivalent admittance is calculated by the formula:
wherein Y is 0k Is the equivalent admittance at the monitoring point of the transmission line corresponding to the kth mode,broadband current phasors of new energy station transmission lines corresponding to the kth mode are +.>And (3) obtaining broadband voltage phasors of the bus at monitoring points of the power transmission line corresponding to the kth mode, wherein k=1.
5. A device according to claim 3, characterized in that the optimization objective of the broadband oscillation stability is:
wherein Y is 0k For the equivalent admittance at the monitoring point of the transmission line corresponding to the kth mode, N c For the number of new energy unit group feeder lines cut off, k=1.
6. The apparatus of claim 2, wherein the control module comprises:
and the cutting unit is used for selecting and cutting off the new energy unit group with the minimum real part in the equivalent admittance corresponding to the mode with the real part smaller than or equal to zero according to the first equivalent admittance of the previous period.
7. The apparatus as recited in claim 1, further comprising:
the new energy unit group admittance measuring device is connected with the first calculation module to acquire the new energy station bus broadband voltage measuring data and the new energy unit group feeder broadband current phasor measuring data.
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