CN113644734A - Power grid monitoring system, device, computer equipment and storage medium - Google Patents

Power grid monitoring system, device, computer equipment and storage medium Download PDF

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Publication number
CN113644734A
CN113644734A CN202110542385.4A CN202110542385A CN113644734A CN 113644734 A CN113644734 A CN 113644734A CN 202110542385 A CN202110542385 A CN 202110542385A CN 113644734 A CN113644734 A CN 113644734A
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inverter
power
parameter
impedance
power parameter
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Inventor
姜臻
于力
张斌
郭志诚
席禹
陈煜敏
符健
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China Southern Power Grid Digital Grid Technology Guangdong Co ltd
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Southern Power Grid Digital Grid Research Institute 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • 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
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The application relates to a power grid monitoring system, a power grid monitoring device, computer equipment and a storage medium. The power grid monitoring system comprises a power generation device, a power distribution network, an inverter, a measuring device and an intelligent gateway; the measuring device is used for injecting measuring signals to the output end of the inverter and the first input end of the power distribution network and measuring power parameters of the output end and the first input end of the inverter; sending the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal to the intelligent gateway; the intelligent gateway is used for determining the impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal, and sending a parameter adjustment strategy to the inverter according to the impedance interaction phase angle margin to instruct the inverter to adjust the equivalent output impedance according to the number adjustment strategy. By adopting the method, the operation stability of the power grid can be monitored, and the continuous and stable operation of the power grid is ensured.

Description

Power grid monitoring system, device, computer equipment and storage medium
Technical Field
The application relates to the technical field of power distribution networks, in particular to a power grid monitoring system, a power grid monitoring device, computer equipment and a storage medium.
Background
New energy is more and more widely applied to a power grid, and new energy power grids are gradually derived by surfing the Internet with new energy electric energy through inverters. In order to ensure that the new energy power grid can safely and stably operate, the operation condition of the new energy power grid needs to be monitored and controlled.
With more and more new energy power being incorporated into the power distribution network, the inverter impedance and the impedance of the power distribution network are changed, which may affect the stable operation of the power distribution network. The main body is that the operation mode of the power grid is likely to be switched at any time, the impedance of the power grid itself is changed due to the change of the operation mode of the power grid, and the impedance of the inverter is changed due to the change of the output power of the new energy power generation device, so that the power grid cannot be continuously and stably operated.
Disclosure of Invention
Therefore, it is necessary to provide a power grid monitoring system, a device, a computer device, and a storage medium for the above technical problem, which can monitor the impedance interaction phase angle margin of the inverter at the new energy power generation end and the power distribution network, so as to monitor the stability of the power grid operation according to the impedance interaction phase angle margin and ensure the continuous and stable operation of the power grid.
A power grid monitoring system, comprising:
power generation facility, distribution network, inverter, measuring device and intelligent gateway.
The measuring device is used for measuring the power parameter of the output end of the inverter and the power parameter of the first input end after injecting measuring signals to the output end of the inverter and the first input end of the power distribution network; the first input end is an input end of the power distribution network corresponding to the power generation device;
the measuring device is also used for sending the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measuring signal to the intelligent gateway;
the intelligent gateway is used for receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal sent by the measurement device, and determining the impedance intersection angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal;
the intelligent gateway is further used for determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin value and sending the parameter adjustment strategy to the inverter, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the parameter adjustment strategy.
According to the power grid monitoring system, the power grid monitoring device, the computer equipment and the storage medium, the measuring device injects measuring signals to the output end of the inverter and the first input end of the power distribution network to measure the power parameters of the output end of the inverter and the power parameters of the first input end; the first input end is an input end of the power distribution network corresponding to the power generation source; then, the measuring device sends the power parameters of the output end of the inverter, the power parameters of the first input end and the power parameters of the measuring signals to the intelligent gateway; the intelligent gateway receives the power parameters of the output end of the inverter, the power parameters of the first input end and the power parameters of the measurement signals sent by the measurement device, and determines the impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameters of the output end of the inverter, the power parameters of the first input end and the power parameters of the measurement signals; and finally, the intelligent gateway determines a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the parameter adjustment strategy, so that the continuous and stable operation of the power grid is ensured.
Drawings
Fig. 1 is a schematic application environment diagram of a power grid monitoring system according to an embodiment of the present application;
fig. 2 is a schematic diagram of interaction of a power grid monitoring system device provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of a power grid monitoring system provided in an embodiment of the present application;
fig. 4 is a schematic flow chart of a power grid monitoring system provided in an embodiment of the present application;
fig. 5 is a schematic diagram of calculating a phase angle margin of a power grid monitoring system according to an embodiment of the present application;
fig. 6 is a schematic flow chart of a power grid monitoring system provided in an embodiment of the present application;
fig. 7 is a schematic flow chart of a method for providing a power grid monitoring system according to an embodiment of the present application;
fig. 8 is a block diagram of an intelligent gateway according to an embodiment of the present disclosure;
fig. 9 is an internal structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The power grid monitoring system provided by the embodiment of the application can be applied to a power distribution network shown in fig. 1. Referring to fig. 1, the power distribution network may include: the system comprises a power grid physical grid frame, an intelligent gateway, a measuring device, a power generation device, an inverter and the like. The grid physical grid comprises lines, a circuit breaker (CB0), switches (QF1, … and QFK) and a plurality of loads. The power generation device is used for converting energy in other forms into electric energy, and can be a traditional energy power generation device or a new energy power generation device. For example, the new energy power generation device may be a wind power generation device, a photovoltaic power generation device, or the like, which is not limited in the embodiments of the present application, and fig. 1 only illustrates single-phase photovoltaic power generation (PV 1, …, PV k).
The inverter is used for inputting the power generation device into the grid physical grid frame.
The intelligent gateway may be a server based on edge computing and may interact with other devices in the power distribution network. The interaction means includes, but is not limited to, a wired communication means or a wireless communication means.
The measuring device can inject voltage signals or current signals into two sides of a grid-connected point of an inverter in the power distribution network, and can also measure the voltage or the current on the two sides of the grid-connected point.
In one embodiment, the various devices in the system shown in fig. 1 may interactively implement monitoring of the operating conditions of the power grid. Referring to fig. 2, the grid monitoring system includes a power generation device, a distribution network, an inverter, a measurement device, and an intelligent gateway.
For example, the measuring device may inject a measuring signal into the output of the inverter and into the first input of the power distribution network. After the measurement device injects the measurement signal, the voltage or current at the output of the inverter and at the first input of the distribution network may change. The measuring device may also measure the current or voltage before and after the output of the inverter and the first input of the distribution network. Specifically, the measurement device may measure the power parameter at the output end of the inverter and the power parameter at the first input end after injecting the measurement signal to the output end of the inverter and the first input end of the power distribution network.
In one possible implementation, the power parameter may be a voltage or a current. The first input of the distribution network may be an input of the distribution network corresponding to the power generation device, i.e. the end of the distribution network to which the inverter is connected.
The measuring device can inject measuring signals into two sides of an inverter grid-connected point in the power distribution network, and measure the voltage or current on the two sides of the inverter grid-connected point. The measurement signal may be a voltage disturbance signal or a current disturbance signal.
In the specific implementation, when the measurement signal is a voltage disturbance signal, the measurement device also measures the current values of the inverter and the output end of the first input end before and after the voltage disturbance signal is injected; in this implementation, the power parameter at the output of the inverter and at the first input of the distribution network is the current.
When the measurement signal is a current disturbance signal, the measurement device also measures the voltage values of the inverter and the output end of the first input end before and after the current disturbance signal is injected.
In this implementation, the power parameter at the output of the inverter and at the first input of the distribution network is a voltage.
The measuring device is further used for sending the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measuring signal to the intelligent gateway.
The intelligent gateway can be a server based on edge calculation, various relay protection element applications are configured, and micro-services based on various relay protection elements can be realized. The intelligent power distribution gateway can collect, process and transmit data collected and uploaded by various sensing devices, metering devices and the like in the power grid monitoring system, and can upload the processed data to the Internet of things platform to realize cloud storage and application of power grid data.
For example, the measuring device may upload the measured power parameter of the output end of the inverter, the measured power parameter of the first input end, and the measured power parameter data of the measurement signal to the intelligent gateway, so that the intelligent gateway performs operation and processing based on the received power parameter, thereby monitoring the operation state of the power grid according to the data processing result.
The intelligent gateway is used for receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal sent by the measurement device, and determining the impedance intersection angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal;
the phase angle margin is generally referred to as a phase margin, and is an important index in circuit design, and is mainly used for measuring the stability of a negative feedback system and predicting overshoot of a step response of a closed loop system. A well-behaved control system should have a phase margin with a value around 45 deg..
Furthermore, the intelligent power distribution gateway can receive the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal which are sent by the measurement device, and can calculate the impedance interaction phase angle margin of the inverter and the power distribution network through a data processing function, so that the stability of the power grid system is measured.
The intelligent gateway is further used for determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin value and sending the parameter adjustment strategy to the inverter, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the parameter adjustment strategy.
The parameter adjusting strategy of the inverter can be a specific scheme with the function of adjusting inverter parameters, and the inverter parameters can be adjusted through the scheme; the preset value may be an empirical value of the impedance interaction phase angle margin for measuring the adaptive setting of the grid operating state, for example, the preset value may be 30 °, which is not limited herein.
Further, if the phase angle margin calculated by the intelligent gateway does not exceed the preset value, the power grid system stability margin is low, instability is easy to occur, and the intelligent gateway can improve the phase angle margin through adjusting the inverter operation parameters until the phase angle margin exceeds the preset value, so that the stability of power grid operation is guaranteed.
In the power grid monitoring system, measurement signals are injected into the output end of the inverter and the first input end of the power distribution network through the measurement device, and the power parameter of the output end of the inverter and the power parameter of the first input end are measured; then, the measuring device sends the measured power parameters of the output end of the inverter, the measured power parameters of the first input end and the measured power parameters of the signal to the intelligent gateway; the intelligent gateway determines the impedance interaction phase angle margin of the inverter and the power distribution network by receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal, which are sent by the measurement device; finally, the intelligent gateway determines a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin, so that the impedance interaction phase angle margin exceeds a preset value, and the continuous and stable operation of the power grid is guaranteed. Meanwhile, the processing of impedance measurement data of all inverters and the calculation of phase angle margin are realized by the intelligent gateway edge calculation function, so that no extra operation chip is needed in the disturbance signal injection and measurement device, and the equipment cost can be reduced.
In one embodiment, the power parameter at the output of the inverter comprises the power parameter before the measurement signal is injected at the output of the inverter and the power parameter after the measurement signal is injected at the output of the inverter; (ii) a The power parameter of the first input terminal comprises a power parameter before the measurement signal is injected into the first input terminal and a power parameter after the measurement signal is injected into the first input terminal.
The power parameter of the output end of the inverter can be two voltage data or two current data of the output end of the inverter before and after the injection of the measurement signal; the power parameter of the first input end can be two voltage data or two current data of the first input end before and after the measured signal is injected.
According to the power grid monitoring system, the measuring device can upload the power parameters of the output end of the inverter and the first input end of the power distribution network before and after the injection of the measuring signals and the power parameters of the measuring signals, and the impedance interaction phase angle margin of the inverter and the power distribution network is calculated through the intelligent gateway, so that a judgment basis is provided for the running state of the power grid.
In one embodiment, referring to the step of confirming the impedance interaction phase angle margin through the intelligent gateway, fig. 3 is a schematic flowchart of the procedure of confirming the impedance interaction phase angle margin through the intelligent gateway, and the impedance interaction phase angle margin of the inverter and the power distribution network is determined according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal, and the method includes:
s301, calculating the admittance of the inverter according to the power parameter before the measurement signal is injected into the output end of the inverter and the power parameter after the measurement signal is injected into the output end of the inverter.
The impedance interaction phase angle margin of the inverter and the power distribution network can measure the stability of the power grid system after the inverter is connected to the power grid.
Further, in order to calculate the impedance interaction phase angle margin of the inverter and the power distribution network, the admittance of the inverter and the power grid impedance need to be calculated first. For the inverter, the measurement device may inject a measurement signal into the output end of the inverter, for example, the injected measurement signal is a voltage disturbance signal, and then measure the current value before and after the injection of the measurement signal into the output end of the inverter, and the intelligent gateway may calculate the equivalent output impedance of the inverter according to the ohm's theorem; the injected measurement signal may also be a current disturbance signal, and at this time, the measurement device measures the voltage value before and after the measurement signal is injected into the output end of the inverter, and similarly, the intelligent gateway may also calculate the equivalent output impedance of the inverter according to the ohm's theorem, which is not limited herein. The inverse of the inverter impedance is the inverter admittance.
S302, calculating the impedance of the first input end according to the power parameter before the measurement signal is injected into the first input end and the power parameter after the measurement signal is injected into the first input end.
The method for calculating the impedance of the first input end of the power distribution network may be the same as the method for calculating the impedance of the inverter in step S301, and details are not described herein.
And S303, calculating the impedance interaction phase angle margin of the inverter and the power distribution network according to the admittance of the inverter and the impedance of the first input end.
It should be noted that the impedance interaction phase angle margin between two circuit elements is related to the impedance of the two circuit elements. Therefore, in step S303, an impedance interaction phase angle margin between the inverter and the power distribution network may be calculated according to the admittance of the inverter and the impedance of the first input terminal.
For example, the intelligent gateway may calculate the impedance interaction phase angle margin between the inverter and the first input terminal of the power distribution network according to the admittance of the inverter and the impedance of the first input terminal.
According to the power grid monitoring system, the intelligent gateway calculates the inverter admittance and the impedance of the first input end of the power distribution network through the power parameters uploaded by the measuring device, and then calculates the impedance interaction phase angle margin of the inverter and the first input end of the power distribution network, so that the running stability of the power grid under the current state is measured. Meanwhile, the processing of all inverter impedance measurement data and the calculation of the phase angle margin are realized by the intelligent gateway edge calculation function, and an additional operation chip is not needed in the measurement device, so that the equipment cost can be reduced.
In one embodiment, the specific steps involved in calculating the impedance interaction phase angle margin according to the admittance of the inverter and the impedance of the first input end of the power distribution grid, as shown in fig. 4, include:
s401, calculating loop gain between the inverter and the first input end of the power distribution network according to the admittance of the inverter and the impedance of the first input end;
if the k-th inverter admittance is Yk and the corresponding first input impedance of the distribution network is Zk, the loop gain Lk between the inverter and the first input impedance of the distribution network is YkZk.
Further, the intelligent gateway can calculate the loop gain between the inverter and the first input end according to the admittance of the inverter and the impedance of the first input end of the power distribution network.
S402, determining a target frequency according to the intersection point of the Nyquist curve of the loop gain and the unit circle, and determining an impedance interaction phase angle margin according to the target frequency.
As shown in fig. 5, if the target frequency is fPM, the target frequency is the intersection frequency of the nyquist curve of the loop gain Lk and the unit circle, and the calculation expression of the phase angle margin PMk between the kth photovoltaic inverter and the grid impedance is as follows:
Figure BDA0003072085400000071
in the formula, arctan represents an arctangent function, and | ImLk | and | ReLk | represent absolute values of imaginary and real parts of the loop gain Lk at a frequency of fPM, respectively. The unit of the phase angle margin PMk calculated according to the formula (1) is radian (expressed by rad), and the unit of the phase angle margin PMk is degree (expressed by DEG) obtained by multiplying 180/pi.
Furthermore, the intelligent gateway can determine a target frequency according to the intersection point of the Nyquist curve of the loop gain and the unit circle, and then can determine the impedance interaction phase angle margin according to the target frequency.
According to the power grid monitoring system, the intelligent gateway calculates the loop gain between the inverter and the power distribution network according to the admittance of the inverter and the impedance of the first input end of the power distribution network, and confirms the target frequency through the intersection point of the Nyquist curve of the loop gain and the unit circle, so that the impedance interaction phase angle tolerance of the inverter and the power distribution network is obtained, and a data basis is provided for judging the stability of the power grid.
In one embodiment, as shown in fig. 6, the specific steps involved in determining the parameter adjustment strategy by impedance interaction phase angle margin include:
s601, judging whether the margin of the impedance interaction phase angle exceeds a preset value;
the preset value can be an empirical value of an impedance intersection angle margin which is adaptively set for measuring the stability of the power grid.
And further, according to the phase angle margin of the inverter and the power distribution network impedance interaction calculated by the intelligent gateway, the current stable operation state of the power grid can be judged after the phase angle margin is compared with the preset value.
S602, if the impedance interaction phase angle margin does not exceed a preset value, determining a parameter adjustment strategy to instruct the inverter to adjust the equivalent output impedance, so that the impedance interaction phase angle margin meets the preset value.
And if the impedance interaction phase angle margin of the inverter and the power distribution network does not exceed a preset value, the current power distribution network operation stability is poor.
Furthermore, the intelligent gateway can send a control command to the corresponding inverter to adjust the equivalent output impedance of the corresponding inverter, so that the impedance interaction phase angle margin is improved, and the stable operation of the power grid system is guaranteed.
According to the power grid monitoring system, the intelligent gateway monitors the running stability of the power grid by judging whether the impedance interaction phase angle margin of the inverter and the power distribution network exceeds a preset value. When the impedance interaction phase angle margin of the inverter and the power distribution network does not exceed the preset value, the intelligent gateway sends a control instruction to the corresponding inverter, so that the running stability margin of the inverter is improved, and the safe and stable running of the power grid is guaranteed.
In one embodiment, a parameter adjustment strategy involving an inverter may include: adjusting the output power of the inverter, and/or adjusting the current inner loop pi parameter of the inverter, and/or adjusting the phase-locked loop pi parameter of the inverter.
For example, the strategy for adjusting the inverter parameters may be that the intelligent gateway sends a command to the corresponding photovoltaic maximum power tracking module to reduce the output power of the inverter to 70% of the original output power, or that the intelligent gateway sends a command to appropriately adjust the corresponding photovoltaic inverter control parameters (e.g., reduce the inverter current inner loop pi parameter), which is not limited herein.
Furthermore, the purpose of improving the impedance interactive stability margin of the inverter and the power distribution network can be achieved by adopting the adjustment strategy of the inverter.
According to the power grid monitoring system, when the impedance interaction phase angle margin of the inverter and the power distribution network is lower than a preset value, the intelligent gateway can send a command to the inverter to reduce the output power of the inverter or reduce the pi parameter of the current inner loop, and the like, so that the impedance interaction phase angle margin of the inverter and the power distribution network is improved, and the running stability of the power grid is improved.
The embodiment of the present application further provides a whole process for monitoring the power grid according to the impedance interaction phase angle margin, as shown in fig. 7, the process includes the following steps:
and S1, injecting a measuring signal by the measuring device and uploading power parameter data on two sides of the grid-connected point of the inverter.
And S2, calculating the inverter admittance and the distribution network impedance.
And S3, calculating the phase angle margin of the inverter and the power distribution network impedance interaction.
And S4, judging whether the impedance interaction phase angle margin of the inverter and the distribution network exceeds a preset value.
And S5, if the mutual phase angle margin of the inverter and the power distribution network impedance exceeds a preset value, returning to the step S1 after waiting for t time.
And if the impedance interaction phase angle margin of the inverter and the power distribution network exceeds a preset value, the current power distribution network operation stability is good, and regulation and control are not needed. t may be a preset time length, which may be a monitoring period of the power grid monitoring system when the power distribution network is stably operated, and is not limited herein.
And S6, if the impedance interaction phase angle margin of the inverter and the distribution network does not exceed the preset value, determining a parameter adjustment strategy, improving the impedance interaction phase angle margin of the inverter and the distribution network, and immediately returning to the step S1.
If the impedance interaction phase angle margin of the inverter and the power distribution network does not exceed a preset value, the current stability of the power distribution network operation is poor, and regulation and control are needed. And (5) after the mutual phase angle margin of the inverter and the power distribution network impedance is improved through a parameter adjusting strategy, immediately returning to the step S1, and detecting whether the current power grid running state is stable.
According to the monitoring process of the power grid system, under the condition that the impedance interaction phase angle margin of the inverter and the power distribution network exceeds a preset value, the intelligent gateway controls the measuring device to inject measuring signals into the output end and the first input end of the inverter, so that the impedance interaction margin is monitored in a new period, and the periodic dynamic monitoring of the power grid operation is realized. Meanwhile, under the condition that the impedance interaction phase angle margin of the inverter and the power distribution network does not exceed a preset value, the step S1 is immediately returned until the power distribution network system stably operates after the impedance interaction phase angle margin of the inverter and the power distribution network is improved through a parameter adjusting strategy.
It should be understood that, although the steps in the flowcharts of fig. 3, 4 and 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 3, 4, and 6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
In another embodiment, as shown in fig. 8, there is provided a smart gateway, which is applied to a power grid monitoring system, wherein the power grid monitoring system includes a power generation source, a power distribution network, an inverter, a measurement device, and a smart gateway, and the smart gateway includes a communication unit 10 and a processing unit 20, wherein:
a communication unit 10, configured to receive the power parameter of the output end of the inverter, the power parameter of the first input end of the power distribution network, and the power parameter of the measurement signal, which are sent by the measurement device; the power parameter of the output end of the inverter is obtained after the measuring device injects a measuring signal into the output end of the inverter, the first input end is an input end of the power distribution network corresponding to the power generation source, and the power parameter of the first input end is obtained after the measuring device injects the measuring signal into the first input end;
the processing unit 20 is used for determining an impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal;
the processing unit 20 is further configured to determine a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin;
the communication unit 10 is further configured to send a parameter adjustment policy to the inverter, where the parameter adjustment policy is used to instruct the inverter to adjust the equivalent output impedance according to the parameter adjustment policy.
In one embodiment, the power parameter at the output of the inverter comprises a power parameter before the measurement signal is injected at the output of the inverter and a power parameter after the measurement signal is injected at the output of the inverter;
the power parameter of the first input terminal comprises a power parameter before the measurement signal is injected into the first input terminal and a power parameter after the measurement signal is injected into the first input terminal.
In one embodiment, the processing unit 20 is specifically configured to calculate the admittance of the inverter from the power parameter before the injection of the measurement signal at the output of the inverter and from the power parameter after the injection of the measurement signal at the output of the inverter; or, calculating the admittance of the inverter according to the power parameter change value after the output end of the inverter injects the measuring signal;
calculating the impedance of the first input end according to the power parameter before the measurement signal is injected into the first input end and the power parameter after the measurement signal is injected into the first input end; or calculating the impedance of the first input end according to the power parameter change value after the measurement signal is injected into the first input end;
and calculating the impedance intersection angle margin of the inverter and the power distribution network according to the admittance of the inverter and the impedance of the first input end.
In one embodiment, the processing unit 20 is specifically configured to determine a loop gain between the inverter and the first input terminal based on the admittance of the inverter and the impedance of the first input terminal;
and determining a target frequency according to the intersection point of the Nyquist curve of the loop gain and the unit circle, and determining an impedance interaction phase angle margin according to the target frequency.
In one embodiment, the processing unit 20 is specifically configured to determine whether the margin value of the impedance interaction phase angle exceeds a preset value;
and if the tolerance value of the impedance interaction phase angle does not exceed the preset value, determining a parameter adjusting strategy to instruct the inverter to adjust the equivalent output impedance.
In one embodiment, the parameter adjustment strategy includes: adjusting the output power of the inverter, and/or adjusting the current inner loop pi parameter of the inverter, and/or adjusting the phase-locked loop pi parameter of the inverter.
In one embodiment, the communication unit 10 is further configured to instruct the measuring device to inject the measurement signal to the output of the inverter and the first input after a preset time period if the impedance interaction phase angle margin exceeds a preset value.
Specifically, the intelligent gateway provided by the above embodiment may be applied to the above power grid operation monitoring system, and the implementation principle and the technical effect thereof are similar and will not be described herein again.
The above modules used in the intelligent gateway may be implemented wholly or partially by software, hardware, or a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 9. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing positioning information data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of processing positioning information.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In another embodiment, there is also provided a computer device comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program being configured to perform the steps of:
receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal sent by the measurement device, and determining the impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal; and determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin value, and sending the parameter adjustment strategy to the inverter, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the parameter adjustment strategy.
In another embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when executed by a processor, performs the steps of:
receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal sent by the measurement device, and determining the impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal; and determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin value, and sending the parameter adjustment strategy to the inverter, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the parameter adjustment strategy.
The implementation principle and technical effect of the computer-readable storage medium provided by this embodiment are similar to those of the above-described method embodiment, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (10)

1. The power grid monitoring system is characterized by comprising a power generation device, a power distribution network, an inverter, a measuring device and an intelligent gateway;
the measuring device is used for injecting measuring signals to the output end of the inverter and the first input end of the power distribution network, and measuring the power parameter of the output end of the inverter and the power parameter of the first input end; the first input end is the input end of the power distribution network corresponding to the power generation device;
the measuring device is further used for sending the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measuring signal to the intelligent gateway;
the intelligent gateway is used for receiving the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal sent by the measurement device, and determining the impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal;
the intelligent gateway is further used for determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin and sending the parameter adjustment strategy to the inverter, wherein the parameter adjustment strategy is used for indicating the inverter to adjust the equivalent output impedance according to the number adjustment strategy.
2. The system of claim 1, wherein the power parameter at the output of the inverter comprises a power parameter before the measurement signal is injected at the output of the inverter and a power parameter after the measurement signal is injected at the output of the inverter;
the power parameter of the first input includes a power parameter before the measurement signal is injected by the first input and a power parameter after the measurement signal is injected by the first input.
3. The system according to claim 2, characterized in that the intelligent gateway is in particular configured to calculate the admittance of the inverter from the power parameter of the measurement signal, the power parameter before the injection of the measurement signal by the output of the inverter, and the power parameter after the injection of the measurement signal by the output of the inverter;
calculating the impedance of the first input end according to the power parameter of the measuring signal, the power parameter before the measuring signal is injected into the first input end and the power parameter after the measuring signal is injected into the first input end;
and calculating the impedance interaction phase angle margin of the inverter and the power distribution network according to the admittance of the inverter and the impedance of the first input end.
4. The system of claim 3, wherein the smart gateway is specifically configured to determine a loop gain between the inverter and the first input based on an admittance of the inverter and an impedance of the first input;
and determining a target frequency according to the intersection point of the Nyquist curve of the loop gain and a unit circle, and determining the impedance interaction phase angle margin according to the target frequency.
5. The system of claim 1, wherein the intelligent gateway is specifically configured to determine whether the impedance interaction phase angle margin value exceeds the preset value;
if the impedance interaction phase angle margin value does not exceed the preset value, determining that the parameter adjusting strategy instructs the inverter to adjust the equivalent output impedance, so that the impedance interaction phase angle margin value exceeds the preset value.
6. The system of claim 5, wherein the parameter adjustment strategy comprises: adjusting the output power of the inverter, and/or adjusting the current inner loop pi parameter of the inverter, and/or adjusting the phase-locked loop pi parameter of the inverter.
7. The system of claim 5, wherein the intelligent gateway is further configured to instruct the measurement device to inject the measurement signal into the output of the inverter and the first input after a preset time period if the impedance interaction phase angle margin exceeds the preset value.
8. The utility model provides an intelligent gateway, its characterized in that, intelligent gateway is applied to electric wire netting monitored control system, electric wire netting monitored control system includes power generation facility, distribution network, inverter, measuring device and intelligent gateway, intelligent gateway includes:
the communication unit is used for receiving the power parameter of the output end of the inverter, the power parameter of the first input end of the power distribution network and the power parameter of the measurement signal, which are sent by the measurement device; the power parameter of the output end of the inverter is obtained after the measurement device injects the measurement signal into the output end of the inverter, the first input end is an input end of the power distribution network corresponding to the power generation source, and the power parameter of the first input end is obtained after the measurement device injects the measurement signal into the first input end;
the processing unit is used for determining an impedance interaction phase angle margin of the inverter and the power distribution network according to the power parameter of the output end of the inverter, the power parameter of the first input end and the power parameter of the measurement signal;
the processing unit is further used for determining a parameter adjustment strategy of the inverter according to the impedance interaction phase angle margin;
the communication unit is further configured to send the parameter adjustment policy to the inverter, where the parameter adjustment policy is used to instruct the inverter to adjust the equivalent output impedance according to the parameter adjustment policy.
9. A computer arrangement comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program performs the steps performed by the intelligent gateway of any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of any one of claims 1 to 7, as performed by the intelligent gateway.
CN202110542385.4A 2021-05-18 2021-05-18 Power grid monitoring system, device, computer equipment and storage medium Pending CN113644734A (en)

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