Oscillation monitoring and governing system and method for distributed wind-solar-storage multi-site

Abstract

The application relates to the field of new energy power generation technology, in particular to an oscillation monitoring and treatment system and method for a distributed wind-solar-storage multi-field station, which comprises a distributed wind power field station, a distributed photovoltaic field station, a collection station, a construction / following network type shared energy storage power station, a booster station and a wideband oscillation monitoring and treatment device, so that the oscillation monitoring and treatment of the distributed wind-solar-storage multi-field station can be performed, active power, reactive power and short-circuit capacity adjustment, inertia and transient voltage support, steady-state voltage, frequency and power angle stability, impedance remodeling and oscillation monitoring and treatment can be realized, and the stability of a power system is improved. Therefore, the problems that inertia is lost, strength is weakened, oscillation occurs frequently and synchronous capacity is insufficient when wind power, photovoltaic power and energy storage are connected to a grid through a converter are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy power generation technology, in particular to an oscillation monitoring and treatment system and method for a distributed wind-solar-storage multi-site station. BACKGROUND

[0002] When wind power, photovoltaic, energy storage and the like are connected to the grid through a converter, most of them operate in a grid-following mode, which can easily lead to the following problems:

[0003] 1. Loss of inertia: the converter has no rotating mass and cannot provide physical inertia; the rate of change of system frequency is aggravated, and stability is deteriorated.

[0004] 2. Strength weakening: the short-circuit current supply capability of the converter is limited (usually 1.2-1.5 times the rated current), which leads to a decrease in the equivalent short-circuit capacity of the power grid, forming a weak power grid.

[0005] 3. Oscillation frequency: the fast and nonlinear control loops of the converter (such as phase-locked loop (PLL), current loop) and the power grid impedance and other converters interact in a wide frequency range, which can easily cause subsynchronous, supersynchronous and high-frequency oscillations (5 Hz ~ 2000 Hz).

[0006] 4. Insufficient synchronization capability: grid-following converters rely on PLL to track the grid voltage, and in a weak power grid, the PLL itself may be unstable and unable to establish a stable voltage and frequency reference.

[0007] In summary, in the prior art, when wind power, photovoltaic, energy storage and the like are connected to the grid through a converter, it is easy to cause loss of inertia, strength weakening, oscillation frequency and insufficient synchronization capability, and the like, which need to be solved. SUMMARY

[0008] The present application provides an oscillation monitoring and treatment system and method for a distributed wind-solar-storage multi-site station to solve the problems of loss of inertia, strength weakening, oscillation frequency and insufficient synchronization capability when wind power, photovoltaic, energy storage and the like are connected to the grid through a converter.

[0009] The first aspect embodiment of the present application provides a distributed wind-solar-storage multi-station oscillation monitoring and treatment system, comprising: a distributed wind power station, an output end of the distributed wind power station being connected with a first input end of a preset collection station, for providing wind alternating current; a distributed photovoltaic power station, an output end of the distributed photovoltaic power station being connected with a second input end of the collection station, for providing photovoltaic alternating current; the collection station, an output end of the collection station being connected with a first input end of a preset grid / following network type shared energy storage power station, for collecting the wind alternating current and the photovoltaic alternating current to generate corresponding first initial alternating current, and using a preset wide-frequency oscillation monitoring and early warning software to monitor voltage and current signals in a target frequency range in the first initial alternating current, to extract multiple signal properties of the voltage and current signals, and based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the multiple signal properties, to separate fundamental waves and each harmonic wave of the first initial alternating current, and to perform visual presentation, and based on the fundamental waves and each harmonic wave and a preset frequency-band oscillation identification logic, to judge whether the distributed wind-solar-storage multi-station exists a wide-frequency oscillation risk, wherein, in the case that the wide-frequency oscillation risk exists, a wide-frequency oscillation early warning operation is performed, wherein the multiple signal properties include frequency components, amplitude variation trends, phase relationships and damping characteristics; the grid / following network type shared energy storage power station, an output end of the grid / following network type shared energy storage power station being connected with a preset first bus, for generating second initial alternating current with grid performance according to the first initial alternating current, and simultaneously performing wide-frequency impedance scanning on a whole network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and judging again whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation according to the scanning results, wherein, in the case that the wide-frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not occur oscillation; a booster station, an input end of the booster station being connected with the first bus, and an output end of the booster station being connected with a preset second bus, for increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current of the target voltage level to a target power grid.

[0010] According to the above technical means, the distributed wind-solar-storage multi-station oscillation monitoring and treatment is performed through the distributed wind power station, the distributed photovoltaic power station, the collection station, the grid / following network type shared energy storage power station, the booster station and the wide-frequency oscillation monitoring and treatment device, so that active power, reactive power and short-circuit capacity adjustment, inertia and transient voltage support, steady-state voltage, frequency and power angle stability, impedance remodeling and oscillation monitoring and treatment can be realized, and the stability of the power system is improved.

[0011] Optionally, in one embodiment of this application, the distributed wind power station includes: multiple grid-connected wind turbines for converting wind energy into wind power AC, and a first new energy impedance optimization design system is constructed through a preset grid-connected collaborative control system. The power supply impedance of the wind turbines is dynamically adjusted through the first new energy impedance optimization design system to regulate damping and manage broadband oscillations in the distributed wind-solar-storage multi-station.

[0012] Based on the above-mentioned technical means, the embodiments of this application effectively manage broadband oscillations and improve the operational stability of multiple power stations by coordinating grid-type wind turbines and dynamically optimizing impedance, adjusting damping from the power generation head and matching system impedance. In addition, the embodiments of this application can also enhance the power supply side support capability with grid characteristics, reduce the impact of new energy output fluctuations on the system, and ensure the continuity and reliability of power supply.

[0013] Optionally, in one embodiment of this application, the distributed photovoltaic power station includes: multiple sets of grid-type photovoltaic arrays for converting solar energy into corresponding direct current, and using a preset inverter to convert the direct current into photovoltaic alternating current, and by adjusting the grid-type collaborative control system to construct a second new energy impedance optimization design system, and using the second new energy impedance optimization design system to dynamically adjust the photovoltaic power supply side impedance to adjust the damping to manage the broadband oscillation of the distributed wind-solar-storage multi-station.

[0014] Based on the above-mentioned technical means, the embodiments of this application can realize efficient conversion and stable supply of solar energy to AC power, and improve the operational stability of multiple power stations by dynamically optimizing impedance and adjusting damping to manage broadband oscillations from the source. In addition, the embodiments of this application enhance the support capability of the power supply side through grid characteristics, ensuring the reliability of power supply.

[0015] Optionally, in one embodiment of this application, the collection station includes: an oscillation monitoring device connected to a preset secondary cabinet to perform a Fourier transform on the first initial AC current to separate the harmonics of the first initial AC current and display them visually, and to perform a broadband oscillation early warning operation based on the harmonics and the frequency band oscillation identification logic when the distributed wind-solar-storage multi-site station has the broadband oscillation risk.

[0016] Based on the above technical means, the embodiments of this application achieve accurate separation and visualization of AC harmonics through secondary cabinet access, and rely on frequency band identification logic to quickly warn of broadband oscillation risks, ensuring the stability and reliability of power transmission in multiple sites.

[0017] Optionally, in an embodiment of the present application, the grid-constructing / following network type shared energy storage power station comprises a broadband scanner, which performs broadband impedance scanning on the entire network of the distributed wind-solar-storage multi-station to obtain corresponding entire network impedance scanning data, so as to determine whether broadband oscillation occurs in the distributed wind-solar-storage multi-station according to the entire network impedance scanning data.

[0018] According to the above technical means, the embodiment of the present application realizes entire network impedance scanning through the built-in broadband scanner, accurately acquires system impedance data, thereby providing reliable support for broadband oscillation determination, helps to discover oscillation hidden dangers in time, and improves the stability and safety of the operation of the distributed wind-solar-storage multi-station.

[0019] Optionally, in an embodiment of the present application, the grid-constructing / following network type shared energy storage power station comprises a grid-constructing mode and a grid-following mode, and has a 0.1-2500Hz broadband impedance scanning function to scan the entire network, acquire source side impedance and network side impedance, and visually monitor voltage waveforms of the distributed wind-solar-storage multi-station, extract oscillation characteristics corresponding to the voltage waveforms, determine whether the distributed wind-solar-storage multi-station meets preset waveform oscillation conditions and / or preset scanning oscillation conditions based on the oscillation characteristics, the source side impedance and the network side impedance, and in combination with the Nyquist criterion, and in the case that the preset waveform oscillation conditions and / or the scanning oscillation conditions are met, determine that the distributed wind-solar-storage multi-station occurs broadband oscillation, and adjust the operation weight proportion of the grid-constructing mode and the grid-following mode running at the same time to govern broadband oscillation.

[0020] According to the above technical means, the embodiment of the present application improves the oscillation determination accuracy through double monitoring means, and realizes accurate governance through double mode weight dynamic adjustment, thereby effectively guaranteeing the operation stability of the distributed wind-solar-storage multi-station and the safety of power energy grid connection.

[0021] Optionally, in an embodiment of the present application, when the grid-constructing / following network type shared energy storage power station runs in the grid-following mode, the active power, the reactive power and the short-circuit capacity of the target grid are preset to be adjusted, and when the grid-constructing / following network type shared energy storage power station runs in the grid-constructing mode, the power system inertia and transient voltage support of the target grid, and the adjustment of steady-state voltage, frequency and power angle stability operation are performed.

[0022] According to the above technical means, the embodiment of the present application realizes all-around regulation and control of grid power, capacity and operation reference through on-demand switching of the grid-constructing and grid-following modes, improves the power balance capability and anti-disturbance level of the target grid, guarantees the stability of voltage and frequency, and enhances the reliability of the overall operation of the power system.

[0023] Optionally, in an embodiment of the present application, the grid-forming / grid-following shared energy storage power station adjusts the grid-forming / grid-following ratio to control the wide frequency oscillation, adjusts the EMS controller of the grid-forming / grid-following shared energy storage power station to inject positive or negative current, and adjusts the impedance size.

[0024] According to the above technical means, the embodiments of the present application realize accurate and efficient control of wide frequency oscillation through multiple layers of wide frequency oscillation control strategies, and further improve the response adaptability to oscillation by dynamically regulating virtual damping and impedance, thereby effectively ensuring the operation stability of the distributed wind-solar-storage multi-station.

[0025] Optionally, in an embodiment of the present application, the distributed wind-solar-storage multi-station is composed of a preset device layer and a station control layer, so that the station control layer receives a dispatching instruction of a target power grid through a preset unified control coordinator and determines a full-station operation state of the distributed wind-solar-storage multi-station, and based on the full-station operation state and the dispatching instruction, the distributed wind-solar-storage multi-station allocates power set values to multiple grid-forming units of the device layer to coordinate the action of internal distributed resources and unified grid-forming attributes, wherein the multiple grid-forming units include grid-forming wind turbines, grid-forming photovoltaic devices, and energy storage power stations in grid-forming / grid-following mode.

[0026] According to the above technical means, the embodiments of the present application realize accurate and efficient control through a double-layer architecture, the unified coordinator ensures the cooperation of resource action and grid-forming attribute, and the double-layer grid-forming architecture efficiently responds to the dispatching of the power grid, thereby improving the utilization rate of distributed resources and strengthening the operation stability of the multi-station and the adaptability to the power grid.

[0027] The second aspect embodiment of the application provides a distributed wind-solar-storage multi-station oscillation monitoring and treatment method, including the following steps: providing wind alternating current and photovoltaic alternating current through a preset distributed wind power station and a distributed photovoltaic power station, and collecting the wind alternating current and the photovoltaic alternating current to generate corresponding first initial alternating current, and monitoring voltage and current signals in a target frequency range in the first initial alternating current by using a preset wide-frequency oscillation monitoring and early warning software to extract multiple signal properties of the voltage and current signals; based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the multiple signal properties, separating fundamental waves and each harmonic of the first initial alternating current, and performing visual presentation, and based on the fundamental waves and each harmonic and a preset frequency-band oscillation identification logic, judging whether the distributed wind-solar-storage multi-station exists a wide-frequency oscillation risk, wherein, in the case that the wide-frequency oscillation risk exists, a wide-frequency oscillation early warning operation is performed, wherein the multiple signal properties include frequency components, amplitude variation trends, phase relationships and damping characteristics; generating second initial alternating current with network construction performance from the first initial alternating current, and performing wide-frequency impedance scanning on a full network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and judging again whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation according to the scanning results, wherein, in the case that the wide-frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not oscillate; increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current at the target voltage level to a target power grid.

[0028] The third aspect embodiment of the application provides a distributed wind-solar-storage multi-station oscillation monitoring and treatment device, including: an oscillation monitoring device installed in a preset collection station, connected with a preset secondary cabinet, used for performing Fourier transform on first initial alternating current generated by the collection station to separate fundamental waves and each harmonic of the first initial alternating current, and perform visual display, and based on the fundamental waves and each harmonic and the frequency-band oscillation identification logic, performing a wide-frequency oscillation early warning operation in the case that the distributed wind-solar-storage multi-station exists the wide-frequency oscillation risk; an oscillation treatment device installed in a preset construction / following network type shared energy storage power station, used for using a wide-frequency scanner in the construction / following network type shared energy storage power station to perform wide-frequency impedance scanning on a full network of the distributed wind-solar-storage multi-station to obtain corresponding full network impedance scanning data, to judge whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation according to the full network impedance scanning data, and in the case that the distributed wind-solar-storage multi-station occurs wide-frequency oscillation, performing a preset oscillation treatment operation.

[0029] The fourth aspect of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the distributed wind-solar-storage multi-site oscillation monitoring and treatment method as described in the above embodiments.

[0030] The fifth aspect of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the distributed wind-solar-storage multi-site oscillation monitoring and treatment method as described above.

[0031] Therefore, the embodiments of the present application have the following beneficial effects:

[0032] Embodiments of the present application include a distributed wind power station, the output end of the distributed wind power station is connected with the first input end of a preset collection station, for providing wind power alternating current; a distributed photovoltaic power station, the output end of the distributed photovoltaic power station is connected with the second input end of the collection station, for providing photovoltaic alternating current; the collection station, the output end of the collection station is connected with the first input end of a preset grid-connected / shared type shared energy storage power station, for collecting the wind power alternating current and the photovoltaic alternating current to generate corresponding first initial alternating current, and using a preset wide-frequency oscillation monitoring and early warning software to monitor the voltage and current signals in a target frequency range in the first initial alternating current to extract multiple signal properties of the voltage and current signals, and based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and combining the multiple signal properties, separating each harmonic of the first initial alternating current, and visually presenting, and based on each harmonic and a preset frequency band oscillation identification logic, judging whether the distributed wind-solar-storage multi-field station has a wide-frequency oscillation risk, wherein, in the case of the wide-frequency oscillation risk, a wide-frequency oscillation early warning operation is performed, wherein, the multiple signal properties include frequency components, amplitude variation trends, phase relationships and damping characteristics; the grid-connected / shared type shared energy storage power station, the output end of the grid-connected / shared type shared energy storage power station is connected with a preset first bus, for generating second initial alternating current with grid-connecting performance according to the first initial alternating current, and simultaneously performing wide-frequency impedance scanning on the entire network of the distributed wind-solar-storage multi-field station to obtain corresponding scanning results, and again judging whether the distributed wind-solar-storage multi-field station has wide-frequency oscillation according to the scanning results, wherein, in the case of the wide-frequency oscillation, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-field station does not have oscillation; a booster station, the input end of the booster station is connected with the first bus, and the output end of the booster station is connected with a preset second bus, for increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current at the target voltage level to a target power grid. Through the distributed wind power station, the distributed photovoltaic power station, the collection station, the grid-connected / shared type shared energy storage power station, the booster station, and the wide-frequency oscillation monitoring and treatment device, the present application performs oscillation monitoring and treatment of the distributed wind-solar-storage multi-field station, so as to realize active power, reactive power, short-circuit capacity adjustment, inertia and transient voltage support, steady-state voltage, frequency and power angle stability, impedance remodeling and oscillation monitoring and treatment, and improve the stability of the power system. Thus, the problems of inertia loss, strength weakening, frequent oscillation and insufficient synchronization capability of wind power, photovoltaic power and energy storage through the converter to be connected to the grid are solved.

[0033] Additional aspects and advantages of the present application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which:

[0035] Figure 1 An example diagram of an oscillation monitoring and treatment system of a distributed wind-solar-storage multi-station according to an embodiment of the present application;

[0036] Figure 2 An example diagram of a logic architecture of an oscillation monitoring and treatment method according to an embodiment of the present application;

[0037] Figure 3 An example flowchart of an oscillation monitoring and treatment method of a distributed wind-solar-storage multi-station according to an embodiment of the present application;

[0038] Figure 4 An example diagram of a logic architecture of an oscillation monitoring and treatment device according to an embodiment of the present application;

[0039] Figure 5 An example diagram of a structure of an electronic device according to an embodiment of the present application.

[0040] Wherein, 10-oscillation monitoring and treatment system of a distributed wind-solar-storage multi-station; 100-distributed wind power station, 200-distributed photovoltaic power station, 300-pooling station, 400-constructed / following network type shared energy storage power station, 500-boosting station; 501-memory, 502-processor, 503-communication interface. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0042] The oscillation monitoring and treatment system and method of the distributed wind-solar-storage multi-station according to the embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems mentioned in the background art, the present application provides an oscillation monitoring and treatment system of a distributed wind-solar-storage multi-station. In the system, a distributed wind power station is connected to a first input end of a preset collection station at the output end for providing wind alternating current; a distributed photovoltaic power station is connected to a second input end of the collection station at the output end for providing photovoltaic alternating current; the output end of the collection station is connected to a first input end of a preset grid-following or grid-forming shared energy storage power station for collecting wind alternating current and photovoltaic alternating current to generate corresponding first initial alternating current, and using a preset wideband oscillation monitoring and early warning software to monitor the voltage and current signals in the target frequency range of the first initial alternating current to extract multiple signal properties of the voltage and current signals, and based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the multiple signal properties, to separate each harmonic of the first initial alternating current and visually present it, and based on the fundamental wave and each harmonic and a preset frequency band oscillation identification logic, to determine whether the distributed wind-solar-storage multi-station has a wideband oscillation risk, wherein, in the case of a wideband oscillation risk, a wideband oscillation early warning operation is performed, wherein the multiple signal properties include frequency components, amplitude variation trends, phase relationships, and damping characteristics; the output end of the grid-following or grid-forming shared energy storage power station is connected to a first busbar for generating second initial alternating current with grid-forming performance according to the first initial alternating current, and simultaneously performing wideband impedance scanning on the entire network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and again determining whether the distributed wind-solar-storage multi-station has wideband oscillation according to the scanning results, wherein, in the case of wideband oscillation, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not oscillate; the input end of a booster station is connected to the first busbar, and the output end of the booster station is connected to a second busbar for increasing the second initial alternating current to a target voltage level and inputting the second initial alternating current at the target voltage level to a target power grid. The present application performs oscillation monitoring and treatment of the distributed wind-solar-storage multi-station through the distributed wind power station, the distributed photovoltaic power station, the collection station, the grid-following or grid-forming shared energy storage power station, the booster station, and the wideband oscillation monitoring and treatment device, so as to realize active power, reactive power, short-circuit capacity adjustment, inertia and transient voltage support, steady-state voltage, frequency, and power angle stability, impedance remodeling, oscillation monitoring and treatment, and improve the stability of the power system. Thus, the problems of inertia loss, strength weakening, frequent oscillation, and insufficient synchronization capability of wind power, photovoltaic power, and energy storage when they are connected to the grid through a converter are solved.

[0043] First, the oscillation monitoring and treatment system of the distributed wind-solar-storage multi-station according to the embodiments of the present application is described with reference to the accompanying drawings.

[0044] Specifically, Figure 1 is a block schematic diagram of the oscillation monitoring and treatment system of the distributed wind-solar-storage multi-station of the embodiment of the present application.

[0045] As Figure 1 shown, the oscillation monitoring and treatment system of the distributed wind-solar-storage multi-station 10 comprises a distributed wind power station 100, a distributed photovoltaic power station 200, a collection station 300, a grid / following network type shared energy storage power station 400, and a booster station 500.

[0046] The distributed wind power station 100 is connected to the first input end of the preset collection station 300, and is configured to provide wind alternating current.

[0047] The distributed photovoltaic power station 200 is connected to the second input end of the collection station 300, and is configured to provide photovoltaic alternating current.

[0048] The embodiment of the present application can connect the output end of the distributed wind power station 100 (with N wind power stations) to the first input end of the collection station 300, so as to convert wind energy into corresponding wind alternating current through wind power conversion technology (such as wind turbine capturing wind energy, conversion through a converter), thereby providing stable wind power resources for the power system.

[0049] Secondly, the embodiment of the present application can connect the output end of the distributed photovoltaic power station 200 (with N photovoltaic power stations) to the second input end of the collection station 300, so as to convert solar energy into corresponding photovoltaic alternating current through photoelectric conversion technology (such as photovoltaic components absorbing solar energy, conversion through an inverter), thereby forming complementary power supply with wind power.

[0050] Optionally, in an embodiment of the present application, the distributed wind power station 100 comprises a plurality of grid-connected wind turbines, which are configured to convert wind energy into wind alternating current, and build a first new energy impedance optimization design system through a preset grid-connected collaborative control system, and dynamically adjust the impedance of the wind turbine power supply side through the first new energy impedance optimization design system, so as to adjust the damping to treat the wide-frequency oscillation of the distributed wind-solar-storage multi-station.

[0051] It should be noted that the distributed wind power station 100 in the embodiment of the present application takes a plurality of grid-connected wind turbines as core components; in the embodiment of the present application, the plurality of grid-connected wind turbines can convert wind energy into wind alternating current through photoelectric conversion, thereby providing clean electric energy for the distributed wind-solar-storage multi-station; secondly, the plurality of grid-connected wind turbines can build a first new energy impedance optimization design system relying on a preset grid-connected collaborative control system, so as to dynamically adjust the impedance of the wind turbine power supply side through the system, thereby adjusting the damping characteristics and realizing the treatment of the wide-frequency oscillation of the multi-station.

[0052] Therefore, the embodiment of the present application can effectively control the wide frequency oscillation by adjusting the damping and matching the system impedance from the power generation source, and improve the operation stability of the multi-station. In addition, the embodiment of the present application can also enhance the support ability of the power supply side through the network characteristics, reduce the influence of new energy output fluctuation on the system, and ensure the continuity and reliability of the power supply.

[0053] Optionally, in an embodiment of the present application, the distributed photovoltaic power station 200 comprises: a plurality of groups of network-constructed photovoltaic arrays, which are used to convert solar energy into corresponding direct current, and convert the direct current into photovoltaic alternating current by using a preset inverter, and a network-constructed collaborative control system is adjusted to build a second new energy impedance optimization design system, and the impedance of the photovoltaic power supply side is dynamically adjusted by using the second new energy impedance optimization design system to adjust the damping and control the wide frequency oscillation of the distributed wind-light-storage multi-station.

[0054] As an implementable way, the distributed photovoltaic power station 200 in the embodiment of the present application is composed of a plurality of groups of network-constructed photovoltaic arrays; the embodiment of the present application can convert solar energy into direct current by photoelectric conversion through the plurality of groups of network-constructed photovoltaic arrays, and inversely convert the direct current into photovoltaic alternating current by using a preset inverter, thereby providing clean electric energy for the distributed wind-light-storage multi-station; in addition, the embodiment of the present application can also build a second new energy impedance optimization design system through a network-constructed collaborative control system to dynamically adjust the impedance of the photovoltaic power supply side, and then adjust the damping characteristics to control the wide frequency oscillation of the multi-station.

[0055] Therefore, the embodiment of the present application can realize efficient conversion and stable supply of solar energy to alternating current, and control the wide frequency oscillation from the source end by impedance dynamic optimization and damping adjustment, thereby improving the operation stability of the multi-station; in addition, the embodiment of the present application can enhance the support ability of the power supply side through the network characteristics, thereby ensuring the reliability of the power supply.

[0056] The collection station 300 is connected to the first input end of the preset network-constructed / following network-constructed shared energy storage power station 400, and is used to collect wind alternating current and photovoltaic alternating current to generate corresponding first initial alternating current, and a preset wide frequency oscillation monitoring and early warning software is used to monitor the voltage and current signals in the target frequency range in the first initial alternating current to extract a plurality of signal properties of the voltage and current signals, and based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the plurality of signal properties, each harmonic of the first initial alternating current is separated, and visualized presentation is performed, and based on the fundamental wave and each harmonic and a preset frequency band oscillation identification logic, it is judged whether the distributed wind-light-storage multi-station exists a wide frequency oscillation risk, wherein, in the case that the wide frequency oscillation risk exists, a wide frequency oscillation early warning operation is performed, wherein the plurality of signal properties include frequency components, amplitude variation trend, phase relationship and damping characteristics.

[0057] In actual implementation, the output end of the gathering station 300 in the embodiment of the present application is connected with the first input end of the grid-connected shared energy storage power station 400. The gathering station 300 can gather the wind power alternating current of the distributed wind power station and the photovoltaic alternating current of the distributed photovoltaic power station, integrate to generate first initial alternating current, and is equipped with broadband oscillation monitoring and early warning software. The voltage and current signals in the target frequency range (such as 0.1-2500 Hz) of the first initial alternating current are monitored to extract signal properties such as frequency components, amplitude change trend, phase relationship and damping characteristics. In addition, the embodiment of the present application can also separate the fundamental wave and each harmonic wave and realize continuous visual monitoring of the oscillation component in the key frequency band by using the sliding window fast Fourier transform combined with the spectrum energy accumulation strategy, and judge whether the distributed wind-light-storage multi-station exists broadband oscillation risk based on the preset frequency band oscillation identification logic, so as to perform corresponding early warning operation when there is risk.

[0058] Therefore, the embodiment of the present application realizes multi-source electric energy gathering and broadband oscillation accurate monitoring and early warning, improves the risk judgment accuracy, avoids the oscillation hidden danger in advance, and guarantees the stability and reliability of the multi-station electric energy transmission.

[0059] Optionally, in an embodiment of the present application, the gathering station 300 comprises an oscillation monitoring device connected with the preset secondary cabinet to perform Fourier transform on the first initial alternating current to separate the fundamental wave and each harmonic wave of the first initial alternating current, and to perform visual display, and to perform broadband oscillation early warning operation in the case that the distributed wind-light-storage multi-station exists broadband oscillation risk based on the fundamental wave and each harmonic wave and the frequency band oscillation identification logic.

[0060] It should be noted that in the embodiment of the present application, the gathering station 300 comprises an oscillation monitoring device which can be connected to the preset secondary cabinet to perform Fourier transform on the first initial alternating current generated after gathering the wind power alternating current and the photovoltaic alternating current, separate the fundamental wave and each harmonic wave and perform visual display. At the same time, the embodiment of the present application can judge whether the distributed wind-light-storage multi-station exists broadband oscillation risk based on the separated fundamental wave and each harmonic wave and the frequency band oscillation identification logic, and perform broadband oscillation early warning operation if there is broadband oscillation risk.

[0061] Therefore, the embodiment of the present application realizes accurate separation and visual presentation of alternating current harmonics by connecting the secondary cabinet, and early warns the broadband oscillation risk relying on the frequency band identification logic, and guarantees the stability and reliability of the multi-station electric energy transmission.

[0062] The output end of the grid-constructing / following network type shared energy storage power station 400 is connected with a preset first busbar, and is used for generating second initial alternating current with grid-constructing performance according to the first initial alternating current, simultaneously performing wide frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and judging again whether the distributed wind-solar-storage multi-station occurs wide frequency oscillation according to the scanning results, wherein in the case of wide frequency oscillation, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not occur oscillation.

[0063] The input end of the booster station 500 is connected with the first busbar, and the output end of the booster station 500 is connected with a preset second busbar, and is used for increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current with the target voltage level to the target power grid.

[0064] Further, the output end of the grid-constructing / following network type shared energy storage power station 400 in the embodiment of the application is connected with the first busbar (i.e. 35KV busbar), thereby the grid-constructing / following network type shared energy storage power station 400 in the embodiment of the application can receive the first initial alternating current transmitted by the collection station 300 and convert it into second initial alternating current with grid-constructing performance; in addition, the grid-constructing / following network type shared energy storage power station 400 can simultaneously perform wide frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-station, and judge whether wide frequency oscillation occurs according to the scanning results, if it occurs, the oscillation treatment operation is performed until the oscillation is eliminated.

[0065] Then, the input end of the booster station 500 is connected with the first busbar, and the output end of the booster station 500 is connected with the second busbar (i.e. 220KV busbar), and the main function is to increase the voltage of the second initial alternating current to a target voltage level, and transmit the electric energy with the target voltage level to the target power grid, so as to complete the voltage adaptation before the electric energy is connected to the grid.

[0066] Therefore, the embodiment of the application realizes double prevention of electric energy optimization and oscillation by the energy storage power station, and guarantees the demand of electric energy adaptation to the power grid by the booster station, improves the stability of multi-station operation, governs the oscillation hidden danger, and ensures that the clean electric energy is safely and efficiently connected to the power grid.

[0067] Optionally, in an embodiment of the application, the grid-constructing / following network type shared energy storage power station 400 comprises a wide frequency scanner, which performs wide frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-station to obtain corresponding whole network impedance scanning data, so as to judge whether the distributed wind-solar-storage multi-station occurs wide frequency oscillation according to the whole network impedance scanning data.

[0068] In the embodiment of the present application, the grid-ride-through type shared energy storage power station 400 is configured with a wideband scanner, which can perform wideband impedance scanning on the entire network of the distributed wind-solar-storage multi-station to obtain corresponding wideband impedance scanning data through scanning, and then determine whether the distributed wind-solar-storage multi-station has wideband oscillation according to the wideband impedance scanning data, thereby providing a key basis for system oscillation prevention and control.

[0069] Therefore, the embodiment of the present application realizes wideband impedance scanning through the built-in wideband scanner, accurately obtains system impedance data, thereby providing reliable support for wideband oscillation judgment, helps to discover oscillation hazards in time, and improves the stability and safety of the operation of the distributed wind-solar-storage multi-station.

[0070] Optionally, in an embodiment of the present application, the grid-ride-through type shared energy storage power station 400 includes a grid-ride-through mode and a grid-ride-by mode, and has a 0.1-2500Hz wideband impedance scanning function to scan the entire network, obtain source-side impedance and network-side impedance, and visually monitor the voltage waveform of the distributed wind-solar-storage multi-station, and extract the oscillation characteristics corresponding to the voltage waveform, and based on the oscillation characteristics, the source-side impedance and the network-side impedance, and in combination with the Nyquist criterion, determine whether the distributed wind-solar-storage multi-station meets the preset waveform oscillation condition and / or the preset scanning oscillation condition, so as to determine that the distributed wind-solar-storage multi-station has wideband oscillation when the preset waveform oscillation condition and / or the scanning oscillation condition is met, and adjust the operation weight ratio of the grid-ride-through mode and the grid-ride-by mode running simultaneously to govern the wideband oscillation.

[0071] As an implementable way, the grid-ride-through type shared energy storage power station 400 in the embodiment of the present application has grid-ride-through and grid-ride-by two operation modes and a 0.1-2500Hz wideband impedance scanning function; the grid-ride-through type shared energy storage power station 400 can simultaneously perform wideband impedance scanning and voltage waveform visual monitoring on the entire network to scan and obtain source-side and network-side impedance, and monitor and extract voltage waveform oscillation characteristics; through the Nyquist criterion, it is determined whether the distributed wind-solar-storage multi-station meets the preset waveform or scanning oscillation condition according to the oscillation characteristics, the source-side impedance and the network-side impedance, if any condition is met, it is determined that wideband oscillation occurs, and then the double-mode operation weight ratio is adjusted to realize oscillation governance.

[0072] Therefore, the embodiment of the present application can construct an oscillation monitoring and treatment device of a distributed wind-solar-storage multi-station (i.e., a wide-frequency oscillation scanning treatment device), which is composed of a monitoring part and a treatment part; wherein the monitoring device is installed in the collection station and connected to the secondary cabinet, and after the Fourier transform calculation of the frequency, each harmonic is separated and visually displayed; at the same time, the embodiment of the present application can install a wide-frequency scanner in the build / follow network type shared energy storage power station to perform wide-frequency impedance scanning on the whole network, and when the distributed wind-solar-storage multi-station meets any condition of the preset waveform or scanning oscillation condition, a wide-frequency oscillation treatment operation is performed.

[0073] Therefore, the embodiment of the present application improves the oscillation judgment accuracy through double monitoring means, and realizes accurate treatment through dynamic adjustment of double mode weights, which effectively guarantees the stable operation of the distributed wind-solar-storage multi-station and the safety of power grid connection.

[0074] Optionally, in an embodiment of the present application, the build / follow network type shared energy storage power station 400 performs preset adjustment operation on the active power, reactive power and short-circuit capacity of the target power grid when operating in the follow network mode, and performs power system inertia and transient voltage support of the target power grid, and adjustment of steady-state voltage, frequency and power angle stability operation when operating in the build network mode.

[0075] It should be noted that the build / follow network type shared energy storage power station 400 in the embodiment of the present application has two operation modes of build network and follow network, and different modes correspond to exclusive regulation and control functions of the target power grid. Specifically, in the follow network mode, the power station can perform preset adjustment operation on the active power, reactive power and short-circuit capacity of the target power grid to accurately match the power and capacity demand of the power grid; in the build network mode, the power station undertakes the tasks of power system inertia provision and transient voltage support of the target power grid, and at the same time realizes adjustment of steady-state voltage, frequency and power angle stability control to guarantee the stable operation of the power grid.

[0076] Therefore, the embodiment of the present application realizes all-around regulation and control of power grid power, capacity and operation reference by switching between follow network mode and build network mode as needed, improves the power balance ability and anti-disturbance level of the target power grid, guarantees voltage and frequency stability, and enhances the reliability of the overall operation of the power system.

[0077] Optionally, in an embodiment of the present application, the build / follow network type shared energy storage power station 400 adjusts the build / follow network type ratio to treat wide-frequency oscillation, and adjusts the EMS controller of the build / follow network type shared energy storage power station 400 to inject current in the forward direction or in the reverse direction, and adjusts the impedance size.

[0078] In actual implementation, the grid-constructing / following network type shared energy storage power station 400 in the embodiment of the application can govern the wide frequency oscillation through a three-step coordination strategy. Specifically, the embodiment of the application can first adjust the operation proportion of the grid-constructing mode and the following network mode to preliminarily achieve oscillation governance; the embodiment of the application can change the size of the impedance of the power station EMS controller by adjusting the injected forward or reverse current to form a complete oscillation governance closed loop.

[0079] Therefore, the embodiment of the application realizes accurate and efficient governance of the wide frequency oscillation through multiple wide frequency oscillation governance strategies; in addition, the embodiment of the application improves the response adaptability to the oscillation by dynamically regulating the virtual damping and impedance, and effectively guarantees the operation stability of the distributed wind-solar-storage multi-site.

[0080] Optionally, in an embodiment of the application, the distributed wind-solar-storage multi-site is composed of a preset device layer and a site control layer, so that the site control layer receives the dispatching instruction of the target power grid through the preset unified control coordinator and determines the full-site operation state of the distributed wind-solar-storage multi-site, and based on the full-site operation state and the dispatching instruction, the power setting value is distributed to the multiple grid-constructing units of the device layer to coordinate the action of the internal distributed resources and unify the grid-constructing attribute, wherein the multiple grid-constructing units include the grid-constructing type wind turbine, the grid-constructing type photovoltaic, and the energy storage power station operating in the grid-constructing / following network mode.

[0081] It should be noted that the distributed wind-solar-storage multi-site in the embodiment of the application adopts a double-layer architecture of the device layer combined with the site control layer. The core grid-constructing units of the device layer include the grid-constructing type wind turbine, the grid-constructing type photovoltaic, and the energy storage power station operating in the grid-constructing / following network mode; the site control layer receives the dispatching instruction of the target power grid through the unified control coordinator, combines the full-site operation state of the multi-site, and distributes the power setting value to each grid-constructing unit of the device layer to coordinate the action of the internal distributed resources and unify the grid-constructing attribute.

[0082] Therefore, the embodiment of the application realizes accurate regulation and control through the double-layer architecture, the unified coordinator guarantees the coordination of the resource action and the grid-constructing attribute, and the double-layer grid-constructing architecture efficiently responds to the power grid dispatching, thereby improving the utilization rate of the distributed resources and strengthening the operation stability of the multi-site and the adaptability to the power grid.

[0083] The oscillation monitoring and governing method and the oscillation monitoring and governing device of the application are described below in combination with the accompanying drawings.

[0084] Figure 2 The following is a schematic diagram of the logical architecture of the oscillation monitoring and governing method of the application. As shown in Figure 2 The oscillation monitoring and governing method of the application includes an oscillation monitoring method and an oscillation governance method.

[0085] Among them, the oscillation monitoring method can extract the frequency components, amplitude change trend, phase relationship and damping characteristics of the voltage and current signals in the range of 0.1-2500Hz to construct a frequency band oscillation identification logic, and at the same time, the fundamental wave and multiple harmonic waveform changes are visualized monitored to determine whether wideband oscillation occurs, and a warning reminder is given when wideband oscillation occurs.

[0086] The oscillation treatment method can scan the impedance under each frequency band by a wideband scanner, judge whether there is oscillation, and perform impedance damping remodeling operation; specifically, the application can adjust the ratio of construction / following network type to realize oscillation treatment.

[0087] The oscillation monitoring and treatment system of the distributed wind-solar-storage multi-station according to the embodiment of the present application comprises a distributed wind power station 100, an output end of the distributed wind power station 100 being connected with a first input end of a preset collection station 300 for providing wind alternating current; a distributed photovoltaic power station 200, an output end of the distributed photovoltaic power station 200 being connected with a second input end of the collection station 300 for providing photovoltaic alternating current; the collection station 300, an output end of the collection station 300 being connected with a first input end of a preset grid / following network type shared energy storage power station 400 for collecting the wind alternating current and the photovoltaic alternating current to generate corresponding first initial alternating current, and monitoring the voltage and current signals in a target frequency range in the first initial alternating current by using a preset wide-frequency oscillation monitoring and early warning software to extract multiple signal properties of the voltage and current signals, and separating each harmonic of the first initial alternating current based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy and in combination with the multiple signal properties, and performing visual presentation, and judging whether the distributed wind-solar-storage multi-station exists a wide-frequency oscillation risk based on the fundamental wave and each harmonic and a preset frequency band oscillation identification logic, wherein, in the case that the wide-frequency oscillation risk exists, a wide-frequency oscillation early warning operation is performed, wherein the multiple signal properties comprise frequency components, amplitude variation trends, phase relationships and damping characteristics; the grid / following network type shared energy storage power station 400, an output end of the grid / following network type shared energy storage power station 400 being connected with a preset first busbar for generating second initial alternating current with grid performance according to the first initial alternating current, and performing wide-frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and judging again whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation according to the scanning results, wherein, in the case that the wide-frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not occur oscillation; a booster station 500, an input end of the booster station 500 being connected with the first busbar, and an output end of the booster station 500 being connected with a preset second busbar for increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current with the target voltage level to a target power grid. The distributed wind-solar-storage multi-station is monitored and treated by the distributed wind power station, the distributed photovoltaic power station, the collection station, the grid / following network type shared energy storage power station, the booster station and the wide-frequency oscillation monitoring and treatment device, so that active power, reactive power, short-circuit capacity adjustment, inertia and transient voltage support, steady-state voltage, frequency and power angle stability, impedance remodeling and oscillation monitoring and treatment can be realized, and the stability of the power system is improved.

[0088] Secondly, the oscillation monitoring and treatment method of the distributed wind-solar-storage multi-station according to the embodiment of the present application is described with reference to the accompanying drawings.

[0089] Figure 3 The flowchart of the oscillation monitoring and treatment method of the distributed wind-solar-storage multi-station provided by the embodiment of the present application is shown in the figure.

[0090] As Figure 3 shown, the distributed wind-solar-storage multi-station oscillation monitoring and treatment method includes the following steps:

[0091] In step S301, wind alternating current and solar alternating current are provided by the preset distributed wind power station and distributed solar power station, and the wind alternating current and solar alternating current are collected to generate corresponding first initial alternating current, and the voltage and current signals in the target frequency range in the first initial alternating current are monitored by using the preset wide-frequency oscillation monitoring and early warning software to extract multiple signal properties of the voltage and current signals.

[0092] In step S302, based on the preset sliding window fast Fourier transform strategy and spectrum energy accumulation strategy, and combined with the multiple signal properties, the fundamental wave and each harmonic of the first initial alternating current are separated, and visualized presentation is performed, and based on the fundamental wave and each harmonic and the preset frequency band oscillation identification logic, it is judged whether the distributed wind-solar-storage multi-station exists wide-frequency oscillation risk, wherein, in the case of wide-frequency oscillation risk, wide-frequency oscillation early warning operation is performed, wherein, the multiple signal properties include frequency component, amplitude change trend, phase relationship and damping characteristic.

[0093] In step S303, the second initial alternating current with network construction performance is generated according to the first initial alternating current, and the wide-frequency impedance scanning is performed on the whole network of the distributed wind-solar-storage multi-station to obtain the corresponding scanning result, and whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation is judged again according to the scanning result, wherein, in the case of wide-frequency oscillation, the preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not oscillate.

[0094] In step S304, the second initial alternating current is increased to the target voltage level, and the second initial alternating current of the target voltage level is input to the target power grid.

[0095] It should be noted that the foregoing explanation and description of the distributed wind-solar-storage multi-station oscillation monitoring and treatment system embodiment are also applicable to the distributed wind-solar-storage multi-station oscillation monitoring and treatment method of this embodiment, which will not be described here.

[0096] According to the oscillation monitoring and treatment method of the distributed wind-solar-storage multi-station provided by the embodiment of the application, wind alternating current and photovoltaic alternating current are provided by the preset distributed wind power station and distributed photovoltaic power station, and the wind alternating current and the photovoltaic alternating current are collected to generate corresponding first initial alternating current, and the voltage and current signals in the target frequency range in the first initial alternating current are monitored by using the preset wide-frequency oscillation monitoring and early warning software to extract multiple signal properties of the voltage and current signals; based on the preset sliding window fast Fourier transform strategy and the spectrum energy accumulation strategy, and in combination with the multiple signal properties, the fundamental wave and each harmonic of the first initial alternating current are separated, and visual presentation is performed, and based on the fundamental wave and each harmonic and the preset frequency-band oscillation identification logic, it is judged whether the distributed wind-solar-storage multi-station exists wide-frequency oscillation risk, wherein, in the case that the wide-frequency oscillation risk exists, a wide-frequency oscillation early warning operation is performed, wherein the multiple signal properties include frequency component, amplitude variation trend, phase relationship and damping characteristic; the second initial alternating current with network construction performance is generated according to the first initial alternating current, and wide-frequency impedance scanning is performed on the whole network of the distributed wind-solar-storage multi-station to obtain corresponding scanning results, and whether the distributed wind-solar-storage multi-station occurs wide-frequency oscillation is judged again according to the scanning results, wherein, in the case that the wide-frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-station does not oscillate; the second initial alternating current is increased to a target voltage level, and the second initial alternating current of the target voltage level is input to the target power grid. Through the distributed wind power station, the distributed photovoltaic station, the collection station, the construction / following network type shared energy storage power station, the booster station, the wide-frequency oscillation monitoring and treatment device, etc., the oscillation monitoring and treatment of the distributed wind-solar-storage multi-station is performed, so that the active power, the reactive power, the short-circuit capacity adjustment, the inertia and the transient voltage support, the steady-state voltage, the frequency, the power angle stability, the impedance remodeling, the oscillation monitoring and treatment are realized, and the stability of the power system is improved.

[0097] The embodiment of the application also provides an oscillation monitoring and treatment device of a distributed wind-solar-storage multi-station.

[0098] The oscillation monitoring device (i.e. the oscillation monitoring and early warning software) is installed in the preset collection station and connected with the preset secondary cabinet, is used for performing Fourier transform on the first initial alternating current generated by the collection station to separate the fundamental wave and each harmonic of the first initial alternating current, and performs visual display, and performs a wide-frequency oscillation early warning operation in the case that the distributed wind-solar-storage multi-station exists wide-frequency oscillation risk based on the fundamental wave and each harmonic and the frequency-band oscillation identification logic.

[0099] The oscillation governance device (i.e. the wide frequency scanning and governance device) is installed in the grid / following network type shared energy storage power station, and is used for using the wide frequency scanner in the grid / following network type shared energy storage power station to perform wide frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-station, so as to obtain corresponding whole network impedance scanning data, to judge whether the distributed wind-solar-storage multi-station occurs wide frequency oscillation according to the whole network impedance scanning data, and in the case that the distributed wind-solar-storage multi-station occurs wide frequency oscillation, a preset oscillation governance operation is performed until normal is restored.

[0100] Figure 4 The figure is a logical architecture diagram of the oscillation monitoring and governance device of the present application. As shown in the figure, the oscillation monitoring and governance device of the present application mainly includes an oscillation monitoring and early warning software and a wide frequency scanning and governance device. Figure 4

[0101] The oscillation monitoring and early warning software is installed in the collection station, to visually monitor the fundamental wave and the multiple harmonics, and to perform oscillation early warning.

[0102] The wide frequency scanning and governance device is installed in the grid / following network type shared energy storage power station, and performs wide frequency scanning to further judge whether wide frequency oscillation occurs, and performs governance operation when wide frequency oscillation occurs, until normal is restored.

[0103] Figure 5 The figure is a structural diagram of an electronic device provided in an embodiment of the present application. The electronic device can include:

[0104] The memory 501, the processor 502, and the computer program stored in the memory 501 and executable on the processor 502.

[0105] The processor 502 implements the distributed wind-solar-storage multi-station oscillation monitoring and governance method provided in the above embodiments when executing the program.

[0106] Further, the electronic device further includes:

[0107] The communication interface 503 is used for communication between the memory 501 and the processor 502.

[0108] The memory 501 is used for storing the computer program executable on the processor 502.

[0109] The memory 501 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0110] ​If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected with each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 5 Only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus.

[0111] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can complete communication between each other through an internal interface.

[0112] The processor 502 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0113] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the distributed wind-solar-storage multi-site oscillation monitoring and treatment method.

[0114] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0115] Moreover, the terms "first", "second", "third", etc. are used herein only to describe different steps or claims and do not imply a relative importance or a specific order of steps. Thus, a feature defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless explicitly specified otherwise.

[0116] Any process or method descriptions or blocks in flow charts herein and elsewhere can be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process. Alternate implementations are included within the scope of the preferred embodiments of the present application in which additional functionality can be added or some functionality can be removed, by, for example, adding one or more steps performing a similar or new function, omitting one or more steps, or both. Such modifications and changes can be made to the processes and methods described with the understanding of this disclosure, and it is understood that the preferred embodiments of the present application can be practiced otherwise than as specifically described.

[0117] The logical and / or steps represented in flow charts herein and elsewhere can be considered as a sequence of executable instructions for implementing the functions or steps in the process, and the preferred embodiments of the present application include additional implementations in which the steps are executed in different orders, including substantially concurrently, or in reverse order, depending on the functionality involved, which will be apparent to those skilled in the art of the embodiments described herein.

[0118] It should be understood that parts of the present application can be realized in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. If realized in hardware and in another embodiment, any one or a combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0119] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0120] In addition, the functional units in each embodiment of the present application can be integrated into one processing module, or each unit can be physically present separately, or two or more units can be integrated into one module. The above integrated module can be realized in the form of hardware or in the form of a software functional module. The integrated module, if realized in the form of a software functional module and sold or used as an independent product, can also be stored in a computer readable storage medium.

[0121] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A system for oscillation monitoring and governing of a distributed wind-solar-storage multi-site, characterized in that, The application relates to a distributed wind power station, a distributed photovoltaic power station, a collection station, a grid-connected / sharing energy storage power station, a voltage boosting station and a distributed wind-solar-storage multi-field station. The output end of the distributed wind power station is connected with the first input end of a preset collection station, and the distributed wind power station is used for providing wind alternating current. The output end of the distributed photovoltaic power station is connected with the second input end of the collection station, and the distributed photovoltaic power station is used for providing photovoltaic alternating current. The output end of the collection station is connected with the first input end of a preset grid-connected / sharing energy storage power station, and the collection station is used for collecting the wind alternating current and the photovoltaic alternating current to generate corresponding first initial alternating current, and the first initial alternating current is monitored by using preset wide-frequency oscillation monitoring and early warning software to monitor the voltage and current signals in a target frequency range of the first initial alternating current, to extract a plurality of signal properties of the voltage and current signals, and based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the plurality of signal properties, the fundamental wave and each harmonic wave of the first initial alternating current are separated and visually presented, and based on the fundamental wave and each harmonic wave and a preset frequency-division segment oscillation identification logic, whether the distributed wind-solar-storage multi-field station has a wide-frequency oscillation risk is judged, wherein, in the case that the wide-frequency oscillation risk exists, a wide-frequency oscillation early warning operation is performed, wherein the plurality of signal properties include frequency components, amplitude variation trends, phase relationships and damping characteristics. The output end of the grid-connected / sharing energy storage power station is connected with a preset first bus, and the grid-connected / sharing energy storage power station is used for generating second initial alternating current with grid-connected performance according to the first initial alternating current, and simultaneously performing wide-frequency impedance scanning on the whole network of the distributed wind-solar-storage multi-field station to obtain corresponding scanning results, and according to the scanning results, whether the distributed wind-solar-storage multi-field station has wide-frequency oscillation is judged again, wherein, in the case that the wide-frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-field station does not have oscillation. The input end of the voltage boosting station is connected with the first bus, and the output end of the voltage boosting station is connected with a preset second bus, and the voltage boosting station is used for increasing the second initial alternating current to a target voltage level, and inputting the second initial alternating current with the target voltage level into a target power grid.

2. The system for oscillation monitoring and governance of distributed wind-solar-storage multi-site of claim 1, wherein, The distributed wind power station comprises a plurality of grid-connected wind turbines, which are used for converting wind energy into the wind alternating current, and constructing a first new energy impedance optimization design system through a preset grid-connected collaborative control system, and dynamically adjusting wind turbine power supply side impedance through the first new energy impedance optimization design system to adjust damping to treat the wide-frequency oscillation of the distributed wind-solar-storage multi-field station. The distributed photovoltaic power station comprises a plurality of grid-connected photovoltaic arrays, which are used for converting solar energy into corresponding direct current, and converting the direct current into the photovoltaic alternating current through a preset inverter, and adjusting the grid-connected collaborative control system to construct a second new energy impedance optimization design system, and dynamically adjusting photovoltaic power supply side impedance through the second new energy impedance optimization design system to adjust damping to treat the wide-frequency oscillation of the distributed wind-solar-storage multi-field station.

3. The distributed wind-photovoltaic-storage multi-site oscillation monitoring and governance system of claim 2, wherein, The collection station comprises ​ 4. The system for oscillation monitoring and governance of distributed wind-solar-storage multi-site of claim 1, wherein, ​ An oscillation monitoring device connected to the preset secondary cabinet to perform Fourier transform on the first initial alternating current to separate the fundamental wave and each harmonic wave of the first initial alternating current, and to perform visual display, and to perform wide frequency oscillation early warning operation based on the fundamental wave and each harmonic wave and the frequency band oscillation identification logic in the case that the wide frequency oscillation risk exists in the distributed wind-solar-storage multi-field station.

5. The system for oscillation monitoring and governance of distributed wind-solar-storage multi-site of claim 1, wherein, The construction / following network type shared energy storage power station includes: A wide frequency scanner to perform wide frequency impedance scanning on the entire network of the distributed wind-solar-storage multi-field station to obtain corresponding entire network impedance scanning data to determine whether the distributed wind-solar-storage multi-field station has occurred wide frequency oscillation according to the entire network impedance scanning data.

6. The oscillation monitoring and governing system of distributed wind-solar-storage multi-site of claim 5, wherein, The construction / following network type shared energy storage power station includes a construction network mode and a following network mode, and has a 0.1-2500Hz wide frequency impedance scanning function to scan the entire network, obtain source side impedance and network side impedance, and visually monitor the voltage waveform of the distributed wind-solar-storage multi-field station, and extract the oscillation characteristics corresponding to the voltage waveform, determine whether the distributed wind-solar-storage multi-field station meets the preset waveform oscillation condition and / or the preset scanning oscillation condition based on the oscillation characteristics, the source side impedance and the network side impedance, and combined with the generalized Nyquist criterion, to determine that the distributed wind-solar-storage multi-field station has occurred wide frequency oscillation and adjust the operation weight proportion of the construction network mode and the following network mode running simultaneously to govern wide frequency oscillation.

7. The system of claim 5, wherein the system is configured to: The construction / following network type shared energy storage power station performs preset adjustment operation on the active power, reactive power and short circuit capacity of the target power grid when running in the following network mode, and performs power system inertia and transient voltage support of the target power grid, and adjustment of steady-state voltage, frequency and power angle stability operation when running in the construction network mode.

8. The system of claim 5, wherein the system is configured to: The construction / following network type shared energy storage power station governs wide frequency oscillation by adjusting the construction / following network type proportion, adjusts the EMS controller of the construction / following network type shared energy storage power station to inject current in the forward direction or in the reverse direction, and adjusts the impedance size.

9. The system for oscillation monitoring and governance of distributed wind-solar-storage multi-site of claim 1, wherein, The distributed wind-solar-storage multi-field station is composed of a preset device layer and a field station control layer to receive the dispatching instruction of the target power grid through the preset unified control coordinator at the field station control layer, determine the full station running state of the distributed wind-solar-storage multi-field station, and distribute power set value to multiple construction network units of the device layer based on the full station running state and the dispatching instruction to coordinate the action of internal distributed resources and unified construction network attributes, wherein the multiple construction network units include construction network type wind turbines, construction network type photovoltaic, and construction / following network type energy storage power stations running simultaneously.

10. A method for oscillation monitoring and governing of a distributed wind-solar-storage multi-site, characterized in that, The method comprises the following steps: The wind alternating current and the photovoltaic alternating current are provided by the preset distributed wind power station and the distributed photovoltaic power station, the wind alternating current and the photovoltaic alternating current are collected to generate corresponding first initial alternating current, and the voltage and current signals in a target frequency range in the first initial alternating current are monitored by using a preset wide frequency oscillation monitoring and early warning software to extract a plurality of signal properties of the voltage and current signals; Based on a preset sliding window fast Fourier transform strategy and a spectrum energy accumulation strategy, and in combination with the plurality of signal properties, the fundamental wave and each harmonic of the first initial alternating current are separated, visualized and presented, and based on the fundamental wave and each harmonic and a preset frequency band oscillation identification logic, it is judged whether the distributed wind-solar-storage multi-field station has a wide frequency oscillation risk, wherein, in the case that the wide frequency oscillation risk exists, a wide frequency oscillation early warning operation is performed, wherein the plurality of signal properties include frequency components, amplitude variation trends, phase relationships and damping characteristics; The second initial alternating current with network construction performance is generated according to the first initial alternating current, and wide frequency impedance scanning is performed on the entire network of the distributed wind-solar-storage multi-field station to obtain corresponding scanning results, and whether the distributed wind-solar-storage multi-field station has wide frequency oscillation is judged again according to the scanning results, wherein, in the case that the wide frequency oscillation occurs, a preset oscillation treatment operation is performed until the distributed wind-solar-storage multi-field station does not oscillate; The second initial alternating current is increased to a target voltage level, and the second initial alternating current at the target voltage level is input to a target power grid.

11. A device for oscillation monitoring and governing of a distributed wind-solar-storage multi-site, characterized in that, The oscillation monitoring and treatment method of the distributed wind-solar-storage multi-field station according to claim 10 comprises: The oscillation monitoring device installed in the preset collection station is connected with a preset secondary cabinet, and is used to perform Fourier transform on the first initial alternating current generated by the collection station to separate the fundamental wave and each harmonic of the first initial alternating current, and to perform visual display, and in the case that the distributed wind-solar-storage multi-field station has the wide frequency oscillation risk, a wide frequency oscillation early warning operation is performed based on the fundamental wave and each harmonic and the frequency band oscillation identification logic; The oscillation treatment device installed in the preset construction / following network type shared energy storage power station is used to use the wide frequency scanner in the construction / following network type shared energy storage power station to perform wide frequency impedance scanning on the entire network of the distributed wind-solar-storage multi-field station to obtain corresponding entire network impedance scanning data, to judge whether the distributed wind-solar-storage multi-field station has wide frequency oscillation according to the entire network impedance scanning data, and in the case that the distributed wind-solar-storage multi-field station has wide frequency oscillation, a preset oscillation treatment operation is performed.

12. An electronic device, comprising: It comprises: A memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the oscillation monitoring and treatment method of the distributed wind-solar-storage multi-field station according to claim 10.

13. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the oscillation monitoring and treatment method of the distributed wind-solar-storage multi-field station according to claim 10.

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