CN110544939A - Power grid low-frequency load shedding optimal configuration method and system suitable for high-proportion new energy - Google Patents
Power grid low-frequency load shedding optimal configuration method and system suitable for high-proportion new energy Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
the invention provides a power grid low-frequency load shedding optimal configuration method and system suitable for high-proportion new energy, which comprises the following steps: calculating the output ratio of the new energy under the current operation mode of the power grid; when the power grid fails, selecting a low-frequency deloading configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid; wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme. The technical scheme provided by the invention considers the output ratio of the new energy in the current operation mode, and ensures that the low-frequency load shedding can not be operated mistakenly to cut off a large amount of loads after the safety and stability control device of the power grid acts.
Description
Technical Field
the invention relates to the field of power systems, in particular to a power grid low-frequency load shedding optimal configuration method and system suitable for high-proportion new energy.
Background
Because the new energy distribution and the load distribution are unbalanced, part of areas show obvious high occupancy ratio characteristics of the new energy, the occupancy ratio of the thermal power generating unit and the geothermal power generating unit is small, and the thermal power generating unit is generally only used as a cold standby unit. With the rapid development of new energy power generation, the large-scale new energy centralized grid connection brings increasingly serious challenges to the operation of a power grid, and on one hand, a new energy unit does not have primary frequency modulation capability and cannot dynamically adjust active power in response to the frequency change of the power grid; on the other hand, after a large number of new energy source machines are connected into the power grid, the power grid can replace a conventional power source to generate power, so that the inertia of the system can be reduced, and when the power grid is in power shortage, the smaller the inertia of the system is, the larger the frequency drop amplitude is. In order to solve the above problems, various countries make relevant regulations according to the safety and actual conditions of a power grid, taking the 'automatic low-frequency load reduction technical regulation of a power system' formulated in China as an example, according to the requirements in the 'automatic low-frequency load reduction technical regulation of the power system' (DL/T428-.
taking the Tibet region of China as an example, the Tibet region is the region with the most abundant solar energy resources in China, the potential of photovoltaic power generation is huge, and in recent years, Tibet power grids are successively put into operation to a large number of photovoltaic power stations, wherein most of the Tibet power grids are connected to the Tibet power grid. By the end of 2018, the photovoltaic grid-connected capacity of the Tibet power grid is increased to 995MW, the water and electricity in the power supply structure of the Tibet power grid are about 60%, the photovoltaic is over 30%, and the obvious high-occupancy characteristic of new energy is presented. Aiming at a global small power grid with a high new energy ratio and a weak receiving end similar to a Tibet region, the small power grid has the characteristics of long line, light load, small inertia, weak grid frame, small power grid scale and the like, after a power receiving channel is broken, a safety and stability control device acts to cut off the load, and as the frequency drop amplitude of the power grid is large and the recovery speed is slow after a large amount of new energy is accessed, the system frequency can still trigger a third defense line to cause low-frequency load shedding action and cause load loss, and in order to avoid the low-frequency load shedding action after the safety and stability control device acts correctly, the current low-frequency load shedding configuration scheme needs to be optimized.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a power grid low-frequency load shedding optimal configuration method suitable for high-proportion new energy, which comprises the following steps:
Calculating the output ratio of the new energy under the current operation mode of the power grid;
When the power grid fails, selecting a low-frequency deloading configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid;
Wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
Preferably, the generating of the low frequency configuration scheme table includes:
simulating different fault types in electromechanical transient simulation software based on the topological structure of the power grid;
respectively generating a low-frequency load shedding configuration scheme based on different new energy output occupation ratios under each fault type;
Setting a configuration parameter value for each low-frequency load shedding configuration scheme based on the obtained existing low-frequency load shedding configuration scheme of the power grid;
Generating a low-frequency configuration scheme table based on the low-frequency load shedding configuration schemes corresponding to all the new energy output ratios;
wherein the configuration parameter values include: a multi-wheel basic wheel and a multi-wheel special wheel; the basic wheel comprises basic wheel first wheel action frequency, level difference and time delay; the special wheel comprises special wheel first wheel action frequency, level difference and time delay.
preferably, the basic first-wheel operating frequency in each low-frequency load shedding scheme is set as follows:
In the formula: fj1-newK is the first wheel action frequency of the basic wheel corresponding to the new energy output ratio K; fj1 is the first wheel action frequency of the basic wheel in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; j1 is the basic first wheel in the existing low-frequency load shedding scheme of the power grid.
preferably, the special first-wheel operating frequency in each low-frequency load shedding scheme is set as follows:
In the formula: ft1-newK is the special wheel first wheel action frequency corresponding to the new energy output ratio K; ft1 is the special first wheel action frequency in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; t1 is the special first wheel in the existing low-frequency load shedding scheme of the power grid.
Preferably, the basic wheel first-wheel action level difference in each low-frequency load shedding configuration scheme is set as the value of the basic wheel first-wheel action level difference in the existing low-frequency load shedding configuration scheme of the power grid;
and the first wheel action delay of the basic wheel in each low-frequency load shedding configuration scheme is set as the value of the first wheel action delay of the basic wheel in the existing low-frequency load shedding configuration scheme of the power grid.
Preferably, the first-wheel action level difference of the special wheel in each low-frequency load shedding configuration scheme is set as the value of the first-wheel action level difference of the special wheel in the existing low-frequency load shedding configuration scheme of the power grid;
and the special first-wheel action delay in each low-frequency load shedding configuration scheme is set as the value of the special first-wheel action delay in the existing low-frequency load shedding configuration scheme of the power grid.
preferably, the fault types include:
the AC power receiving channel is disconnected, a large power plant in the power grid is lost, and the DC bipolar latch-up is failed.
Preferably, the ratio of the new energy output is calculated according to the following formula:
in the formula, K is the ratio of the new energy, PN is the active power generated by the new energy, and PG is the active power generated by all power supplies.
Based on the same invention concept, the invention also provides a power grid low-frequency load shedding optimal configuration system suitable for high-proportion new energy, which comprises the following steps:
the calculation module is used for calculating the output ratio of the new energy under the current operation mode of the power grid;
the selection module is used for selecting a low-frequency load shedding configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid when the power grid fails;
wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
preferably, the system further comprises a generating module, configured to generate the low frequency configuration scheme table;
The generation module comprises:
the simulation unit is used for simulating different fault types in electromechanical transient simulation software based on the topological structure of the power grid;
the first generating unit is used for respectively generating a low-frequency load shedding configuration scheme based on different new energy output ratios under each fault type;
The assignment unit is used for setting a configuration parameter value for each low-frequency load shedding configuration scheme based on the obtained existing low-frequency load shedding configuration scheme of the power grid;
the second generation unit is used for generating a low-frequency configuration scheme table based on the low-frequency load shedding configuration schemes corresponding to all the new energy output ratios;
Wherein the configuration parameter values include: a multi-wheel basic wheel and a multi-wheel special wheel; the basic wheel comprises basic wheel first wheel action frequency, level difference and time delay; the special wheel comprises special wheel first wheel action frequency, level difference and time delay.
Compared with the prior art, the invention has the beneficial effects that:
According to the technical scheme provided by the invention, the output ratio of new energy under the current operation mode of the power grid is calculated; when the power grid fails, selecting a low-frequency deloading configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid; wherein the low frequency load shedding configuration scheme table comprises: the scheme considers the new energy output ratio under the current operation mode, and ensures that the low-frequency load shedding can not be operated mistakenly to cut off a large amount of loads after the safety and stability control device of the power grid acts.
according to the technical scheme provided by the invention, when the three-permanent-magnet N-1 fault of the alternating current line, the three-permanent-magnet N-2 fault of the alternating current line, the locking fault of the direct current single machine and the locking fault of the direct current double pole occur in a new energy high-ratio area, the low-frequency load shedding action after the safety and stability control device correctly acts is avoided, and the current low-frequency load shedding configuration scheme needs to be optimized.
the invention provides a reliable low-frequency load shedding optimal configuration method for a new energy high-occupancy weak receiving end power grid for power grid dispatching personnel.
Drawings
Fig. 1 is a detailed flowchart of a power grid low-frequency load shedding optimal configuration method suitable for high-proportion new energy provided by the invention;
FIG. 2 is a diagram of Tibet power grid geography wiring in an embodiment of the invention;
FIG. 3 is a schematic diagram of a frequency change condition under different ratios of new energy output according to an embodiment of the present invention;
FIG. 4 is a schematic diagram comparing the prior art scheme with the optimized scheme provided by the present invention;
fig. 5 is a flowchart of a power grid low-frequency load shedding optimal configuration method suitable for high-proportion new energy provided by the invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
example 1
as shown in fig. 5, the method for optimally configuring the low-frequency load shedding of the power grid adapted to the high-proportion new energy provided by the invention comprises the following steps:
S1, calculating the output ratio of the new energy under the current operation mode of the power grid;
s2, when the power grid fails, selecting a low-frequency load shedding configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid;
Wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
As shown in fig. 1, the method specifically comprises the following steps:
(1) establishing a model for researching horizontal annual power grid load flow calculation and stability calculation;
And establishing a power grid load flow calculation and stability calculation model, wherein the power grid load flow calculation and stability calculation model comprises new energy, conventional hydropower and thermal power installed capacity and output, generator and excitation system thereof, speed regulator, power system stabilizer data, alternating current transmission line parameters, transformer parameters, network interconnection topological structure, direct current transmission system control mode and controller parameters and the like.
(2) acquiring an existing low-frequency load shedding configuration scheme of a power grid;
the low-frequency load shedding configuration scheme comprises n basic wheels and n special wheels, wherein the first wheel action frequency of the basic wheels is fj1, the first wheel action level difference of the basic wheels is delta fj, and the first wheel action delay of the basic wheels is tj; the first wheel action frequency of the special wheel is ft1, the first wheel action step difference of the special wheel is delta ft, and the first wheel action delay of the special wheel is tt.
(3) Calculating a low-frequency load shedding configuration scheme under different new energy output ratio conditions;
and calculating a low-frequency load shedding configuration scheme under the conditions of different new energy output ratios by using safety and stability analysis and calculation software of the power system, keeping the load in the power grid and the exchange active power with an external power grid unchanged, and changing the new energy output ratio K by increasing, opening and closing a conventional power supply and a new energy unit with the same capacity.
in the formula, PN is active power generated by the new energy, and PG is active power generated by all power supplies.
Considering the situation that the new energy output ratio K is 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%, respectively, calculating the maximum power shortage fault and adopting the frequency variation after the safety and stability control device cuts off the equivalent load measures.
the maximum power deficit fault includes: the AC power receiving channel is disconnected, a large power plant in the power grid is lost, and the DC bipolar latch-up is failed.
and 9 groups of low-frequency load shedding configuration schemes and 9 groups of low-frequency load shedding configuration scheme parameters are obtained, and as shown in table 1, a low-frequency load shedding configuration scheme table is generated based on the new energy output ratio, the 9 groups of low-frequency load shedding configuration schemes and the 9 groups of low-frequency load shedding configuration scheme parameters.
TABLE 1 Low-frequency deloading configuration scheme Table
the calculation method of the basic wheel first wheel motion frequency fj1-new 10-fj 1-new90 and the special wheel first wheel motion frequency ft1-new 10-ft 1-new90 is as follows:
When the new energy output ratio K is 10%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew10, and comparing the values of fnew10 and fj1, if fnew10 is not less than fj1, fj1-new10 is fj1, and if fnew10 is less than fj1, fj1-new10 is fnew 10; comparing the sizes of fnew10 and ft1, if fnew10 is not less than ft1, ft1-new10 is ft1, and if fnew10 is less than ft1, ft1-new10 is fnew 10.
when the new energy output ratio K is 20%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew20, and comparing the values of fnew20 and fj1, if fnew20 is not less than fj1, fj1-new20 is fj1, and if fnew20 is less than fj1, fj1-new20 is fnew 20; comparing the sizes of fnew20 and ft1, if fnew20 is not less than ft1, ft1-new20 is ft1, and if fnew20 is less than ft1, ft1-new20 is fnew 20.
When the new energy output ratio K is 30%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew30, and comparing the values of fnew30 and fj1, if fnew30 is not less than fj1, fj1-new30 is fj1, and if fnew30 is less than fj1, fj1-new30 is fnew 30; comparing the sizes of fnew30 and ft1, if fnew30 is not less than ft1, ft1-new30 is ft1, and if fnew30 is less than ft1, ft1-new30 is fnew 30.
when the new energy output ratio K is 40%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew40, and comparing the values of fnew40 and fj1, if fnew40 is not less than fj1, fj1-new40 is fj1, and if fnew40 is smaller than fj1, fj1-new40 is fnew 40; comparing the sizes of fnew40 and ft1, if fnew40 is not less than ft1, ft1-new40 is ft1, and if fnew40 is less than ft1, ft1-new40 is fnew 40.
When the new energy output ratio K is 50%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew50, and comparing the values of fnew50 and fj1, if fnew50 is not less than fj1, fj1-new50 is fj1, and if fnew50 is smaller than fj1, fj1-new50 is fnew 50; comparing the sizes of fnew50 and ft1, if fnew50 is not less than ft1, ft1-new50 is ft1, and if fnew50 is less than ft1, ft1-new50 is fnew 50.
When the new energy output ratio K is 60%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew60, and comparing the values of fnew60 and fj1, if fnew60 is not less than fj1, fj1-new60 is fj1, and if fnew60 is smaller than fj1, fj1-new60 is fnew 60; comparing the sizes of fnew60 and ft1, if fnew60 is not less than ft1, ft1-new60 is ft1, and if fnew60 is less than ft1, ft1-new60 is fnew 60.
When the new energy output ratio K is 70%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew70, and comparing the values of fnew70 and fj1, if fnew70 is not less than fj1, fj1-new70 is fj1, and if fnew70 is smaller than fj1, fj1-new70 is fnew 70; comparing the sizes of fnew70 and ft1, if fnew70 is not less than ft1, ft1-new70 is ft1, and if fnew70 is less than ft1, ft1-new70 is fnew 70.
When the new energy output ratio K is 80%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew0, and comparing the values of fnew80 and fj1, if fnew80 is not less than fj1, fj1-new80 is fj1, and if fnew80 is smaller than fj1, fj1-new80 is fnew 80; comparing the sizes of fnew80 and ft1, if fnew80 is not less than ft1, ft1-new80 is ft1, and if fnew80 is less than ft1, ft1-new80 is fnew 80.
When the new energy output ratio K is 90%, simulating that the maximum power shortage fault occurs in a power grid and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency of the power grid is fnew90, and comparing the values of fnew90 and fj1, if fnew90 is not less than fj1, fj1-new90 is fj1, and if fnew90 is smaller than fj1, fj1-new90 is fnew 90; comparing the sizes of fnew90 and ft1, if fnew90 is not less than ft1, ft1-new90 is ft1, and if fnew90 is less than ft1, ft1-new90 is fnew 90.
In summary, the basic first wheel operating frequency in each low-frequency load shedding scheme is set as follows:
in the formula: fj1-newK is the first wheel action frequency of the basic wheel corresponding to the new energy output ratio K; fj1 is the first wheel action frequency of the basic wheel in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; j1 is the basic first wheel in the existing low-frequency load shedding scheme of the power grid.
The setting of the special first wheel action frequency in each low-frequency load shedding configuration scheme is as follows:
In the formula: ft1-newK is the special wheel first wheel action frequency corresponding to the new energy output ratio K; ft1 is the special first wheel action frequency in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; t1 is the special first wheel in the existing low-frequency load shedding scheme of the power grid.
The basic wheel step difference delta fj and the time delay tj are the same as the existing low-frequency load shedding scheme. The special wheel step difference delta ft and the time delay tt are the same as those of the existing low-frequency load shedding scheme.
(4) Calculating the output ratio of the new energy under the current operation mode of the power grid;
And reading the active power actually sent by the new energy in the power grid and the active power sent by all power supplies, and calculating the ratio K of the output of the new energy.
(5) detecting whether a system fails;
The detection of whether the system has a fault includes: three-permanent-N-1 fault of an alternating current line, three-permanent-N-2 fault of the alternating current line, direct current single machine lockout fault and direct current bipolar lockout fault. And (5) if the system is detected to be in fault, executing the step (6), and if the system is not detected to be in fault, returning to the step (4).
(6) selecting a low-frequency load shedding configuration scheme according to the action condition of the safety and stability control device;
And (4) if the safety and stability control device operates correctly after the fault, selecting a low-frequency load shedding scheme according to the new energy output ratio K obtained in the step (4). When K is more than 0 and less than or equal to 10 percent, adopting a scheme 1; when K is less than or equal to 20% by 10%, adopting a scheme 2; when the K is less than or equal to 20% and less than or equal to 30%, adopting a scheme 3; when K is less than or equal to 40% by 30%, adopting a scheme 4; when K is less than or equal to 50% by 40%, adopting a scheme 5; when K is less than or equal to 60% and is 50%, adopting a scheme 6; when K is less than or equal to 70% by 60%, adopting a scheme 7; when the K is less than or equal to 70% and less than or equal to 80%, adopting a scheme 8; when the K is less than or equal to 80% and less than or equal to 90%, the scheme 9 is adopted.
and after the fault, if the safety and stability control device does not act correctly, adopting the original low-frequency load shedding scheme.
The three defense lines of the power grid are respectively as follows: relay protection, overload cutting load stabilizing and controlling device and low-frequency low-voltage out-of-step disconnection device. The technical scheme of the invention is provided to prevent the low-frequency load shedding action after the safety and stability control device acts on the power grid, ensure that the low-frequency load shedding does not malfunction to cut off a large amount of loads, and provide a reliable low-frequency load shedding optimal configuration method for the power grid of the new energy high-occupancy weak-receiving end for power grid dispatching personnel.
example 2
The embodiment takes a Tibet power grid as an example, and describes implementation steps of a power grid low-frequency load shedding optimal configuration method suitable for high-proportion new energy:
(1) Establishing a model for researching horizontal annual power grid load flow calculation and stability calculation;
Taking the Tibet power grid with higher photovoltaic new energy output ratio as an example, collecting 2019 year data of the Tibet power grid, including parameters of an alternating current transmission line and a transformer, network topology interconnection data, power generation unit output and load power data, and data of a generator and an excitation and speed regulation system thereof. And establishing a Tibet power grid load flow steady-state simulation calculation model and an electromechanical transient simulation calculation model, wherein a Tibet power grid geographical wiring diagram is shown in FIG. 2.
(2) Scheme for obtaining existing low-frequency load shedding configuration of power grid
The current Tibet power grid low frequency load shedding scheme is shown in the following table.
table 2 Tibet power grid low frequency load shedding scheme
The Tibet power grid low-frequency load shedding configuration scheme comprises 9 basic wheels and 2 special wheels, wherein the first wheel action frequency fj1 of the basic wheels is 48.8Hz, the level difference delta fj is 0.2Hz, and the time delay tj is 0.3 s; the first wheel action frequency ft1 of the special wheel is 49Hz, the step difference is 0.2Hz, and the time delay tt is 10 seconds.
(3) Low-frequency load shedding configuration scheme under condition of calculating different new energy output ratios
The PSD-BPA electromechanical transient simulation software is utilized to simulate the maximum power shortage fault of the Tibet power grid and take a measure of removing equivalent load by a safety and stability control device, the maximum power transmission power of the BATANG-Mankang line to the Tibet power grid is 350MW, and therefore the maximum power shortage fault is a three-permanent-N-2 fault of the BATANG-Mankang line. As shown in fig. 3, the frequency variation condition under different new energy output ratio conditions is calculated while keeping the load and the diesel-pull direct-current active power in the Tibet grid unchanged.
According to FIG. 3, basic wheel first wheel operating frequencies fj1-new 10-fj 1-new90 and special wheel first wheel operating frequencies ft1-new 10-ft 1-new90 can be obtained.
When the output duty ratio K of the new energy is 10%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off an equivalent load measure, wherein the lowest frequency fnew10 of a power grid is 49.5Hz, as fnew10 is not less than fj1, fj1-new10 is 48.8Hz, and as fnew10 is not less than ft1, ft1-new10 is 49 Hz.
When the output duty ratio K of the new energy is 20%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off an equivalent load measure, wherein the lowest frequency fnew20 of a power grid is 49.6Hz, as fnew20 is not less than fj1, fj1-new20 is 48.8Hz, and as fnew20 is not less than ft1, ft1-new20 is 49 Hz.
When the output percentage K of the new energy is 30%, simulating the triple-permanent N-2 fault of the Batang-Mikang line and taking a safety and stability control device to cut off an equivalent load measure, wherein the lowest frequency fnew30 of the power grid is 49Hz, as fnew30 is not less than fj1, fj1-new30 is 48.8Hz, and as fnew30 is not less than ft1, ft1-new30 is 49 Hz.
When the new energy output ratio K is 40%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew40 of the power grid is 48.7Hz, fj1-new40 is 48.7Hz because fnew40 is smaller than fj1, and ft1-new40 is 48.7Hz because fnew40 is smaller than ft 1.
When the output duty ratio K of the new energy is 50%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew50 of a power grid is 48.6Hz, fj1-new50 is 48.6Hz because fnew50 is smaller than fj1, and ft1-new50 is 48.6Hz because fnew50 is smaller than ft 1.
when the new energy output ratio K is 60%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew60 of the power grid is 48.5Hz, fj1-new60 is 48.5Hz because fnew60 is smaller than fj1, and ft1-new60 is 48.5Hz because fnew60 is smaller than ft 1.
When the new energy output ratio K is 70%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew70 of the power grid is 48.4Hz, fj1-new70 is 48.4Hz because fnew70 is smaller than fj1, and ft1-new70 is 48.4Hz because fnew70 is smaller than ft 1.
when the new energy output ratio K is 80%, simulating the triple-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew80 of the power grid is 48.2Hz, fj1-new80 is 48.2Hz because fnew80 is smaller than fj1, and ft1-new80 is 48.2Hz because fnew80 is smaller than ft 1.
when the new energy output ratio K is 90%, simulating the Tri-permanent N-2 fault of a Batang-Mikang line and taking a safety and stability control device to cut off equivalent load measures, wherein the lowest frequency fnew90 of the power grid is 48Hz, fj1-new 90-48 Hz is obtained when fnew90 is smaller than fj1, and ft1-new 90-48 Hz is obtained when fnew90 is smaller than ft 1.
table 3 table of low frequency configuration scheme for Tibet power grid
(4) calculating the ratio of new energy output to the current operation mode of the power grid
reading the active power actually sent by the new energy in the Tibet power grid and the active power sent by all power supplies to be 550MW and 1000MW respectively, and calculating to obtain the output ratio K of the new energy to be 55%.
(5) detecting whether a system is malfunctioning
And (5) if the system is detected to have a three permanent N-2 fault of the Barpool-Manuk line, executing the step (6).
(6) selecting a low-frequency load shedding configuration scheme according to the action condition of the safety and stability control device
And after the three permanent N-2 faults of the Barpond-Manuk line occur, the safety and stability control device acts correctly, the power transmitted by the Barpond-Manuk line to the Tibet power grid is 350MW, and the load of the Tibet power grid is cut off at 350 MW. And (5) selecting a low-frequency load shedding scheme according to the new energy output ratio K obtained in the step (4). K is 55%, and K is less than or equal to 60% in a ratio of 50%, and scheme 6 is adopted.
The parameters of the low-frequency load shedding configuration scheme are obtained as follows: the first wheel action frequency of the basic wheel is 48.5Hz, the level difference is 0.2Hz, and the time delay is 0.3 second; the first wheel action frequency of the special wheel is 48.5Hz, the step difference is 0.2Hz, and the time delay is 10 seconds.
Fig. 4 is a comparison of the original low frequency load shedding scheme and the optimization scheme. If the existing low-frequency load shedding configuration scheme is adopted, when the three permanent N-2 of the Barbang-Mankang line fails and a safety and stability control device is adopted to cut off an equivalent load measure, the system frequency falls below 48.8Hz, the 1 st low-frequency load shedding action is triggered, the Tibet power grid load is cut off by 61.7MW, and the steady-state frequency of the system is increased to 50.3 Hz. After the low-frequency load shedding configuration is optimized by adopting the embodiment, load loss is avoided, and the system frequency can be recovered to the operation level before the fault.
The low-frequency load shedding configuration method provided by the embodiment of the invention is not a general principle, but a principle that high-proportion new energy is accessed into a power grid is considered.
Example 3
Based on the same inventive concept, the embodiment further provides a power grid low-frequency load shedding optimal configuration system suitable for high-proportion new energy, which comprises:
the calculation module is used for calculating the output ratio of the new energy under the current operation mode of the power grid;
The selection module is used for selecting a low-frequency load shedding configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid when the power grid fails;
Wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
In an embodiment, the system further comprises a generating module, configured to generate a low frequency configuration scheme table;
The generation module comprises:
The simulation unit is used for simulating different fault types in electromechanical transient simulation software based on the topological structure of the power grid;
The first generating unit is used for respectively generating a low-frequency load shedding configuration scheme based on different new energy output ratios under each fault type;
The assignment unit is used for setting a configuration parameter value for each low-frequency load shedding configuration scheme based on the obtained existing low-frequency load shedding configuration scheme of the power grid;
The second generation unit is used for generating a low-frequency configuration scheme table based on the low-frequency load shedding configuration schemes corresponding to all the new energy output ratios;
wherein the configuration parameter values include: a multi-wheel basic wheel and a multi-wheel special wheel; the basic wheel comprises basic wheel first wheel action frequency, level difference and time delay; the special wheel comprises special wheel first wheel action frequency, level difference and time delay.
as will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
the present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. a power grid low-frequency load shedding optimal configuration method suitable for high-proportion new energy is characterized by comprising the following steps:
calculating the output ratio of the new energy under the current operation mode of the power grid;
When the power grid fails, selecting a low-frequency deloading configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid;
wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
2. the method of claim 1, wherein the generating of the low frequency profile table comprises:
simulating different fault types in electromechanical transient simulation software based on the topological structure of the power grid;
respectively generating a low-frequency load shedding configuration scheme based on different new energy output occupation ratios under each fault type;
setting a configuration parameter value for each low-frequency load shedding configuration scheme based on the obtained existing low-frequency load shedding configuration scheme of the power grid;
Generating a low-frequency configuration scheme table based on the low-frequency load shedding configuration schemes corresponding to all the new energy output ratios;
wherein the configuration parameter values include: a multi-wheel basic wheel and a multi-wheel special wheel; the basic wheel comprises basic wheel first wheel action frequency, level difference and time delay; the special wheel comprises special wheel first wheel action frequency, level difference and time delay.
3. The method of claim 2, wherein the basic first-wheel operating frequency in each low-frequency derating configuration is set by the following equation:
In the formula: fj1-newK is the first wheel action frequency of the basic wheel corresponding to the new energy output ratio K; fj1 is the first wheel action frequency of the basic wheel in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; j1 is the basic first wheel in the existing low-frequency load shedding scheme of the power grid.
4. The method of claim 2, wherein the frequency of the special first-wheel operation in each low frequency offloading configuration is set by:
in the formula: ft1-newK is the special wheel first wheel action frequency corresponding to the new energy output ratio K; ft1 is the special first wheel action frequency in the existing low-frequency load shedding configuration scheme of the power grid; fnewK is the lowest frequency of the power grid corresponding to the maximum power shortage fault of the power grid when the new energy output accounts for K and the equivalent load is removed by adopting a safety and stability control device; t1 is the special first wheel in the existing low-frequency load shedding scheme of the power grid.
5. the method of claim 2, wherein the basic first-wheel action difference in each low-frequency load shedding scheme is set to a value of the basic first-wheel action difference in the existing low-frequency load shedding scheme of the power grid;
and the first wheel action delay of the basic wheel in each low-frequency load shedding configuration scheme is set as the value of the first wheel action delay of the basic wheel in the existing low-frequency load shedding configuration scheme of the power grid.
6. the method of claim 2, wherein the special first-wheel action level difference in each low-frequency load shedding scheme is set to a value of the special first-wheel action level difference in the existing low-frequency load shedding scheme of the power grid;
and the special first-wheel action delay in each low-frequency load shedding configuration scheme is set as the value of the special first-wheel action delay in the existing low-frequency load shedding configuration scheme of the power grid.
7. the method of claim 2, wherein the type of fault comprises:
The AC power receiving channel is disconnected, a large power plant in the power grid is lost, and the DC bipolar latch-up is failed.
8. The method of claim 1, wherein the new energy output ratio is calculated as:
In the formula, K is the ratio of the new energy, PN is the active power generated by the new energy, and PG is the active power generated by all power supplies.
9. a power grid low-frequency load shedding optimal configuration system adapting to high-proportion new energy is characterized by comprising:
the calculation module is used for calculating the output ratio of the new energy under the current operation mode of the power grid;
The selection module is used for selecting a low-frequency load shedding configuration scheme from a pre-generated low-frequency configuration scheme table based on the new energy output ratio and the action condition of the safety and stability control device in the current operation mode of the power grid when the power grid fails;
Wherein the low frequency load shedding configuration scheme table comprises: the new energy output ratio, the low-frequency configuration scheme and the configuration parameter value corresponding to the low-frequency configuration scheme.
10. The system of claim 9, further comprising a generation module to generate a low frequency configuration scheme table;
The generation module comprises:
the simulation unit is used for simulating different fault types in electromechanical transient simulation software based on the topological structure of the power grid;
the first generating unit is used for respectively generating a low-frequency load shedding configuration scheme based on different new energy output ratios under each fault type;
The assignment unit is used for setting a configuration parameter value for each low-frequency load shedding configuration scheme based on the obtained existing low-frequency load shedding configuration scheme of the power grid;
The second generation unit is used for generating a low-frequency configuration scheme table based on the low-frequency load shedding configuration schemes corresponding to all the new energy output ratios;
Wherein the configuration parameter values include: a multi-wheel basic wheel and a multi-wheel special wheel; the basic wheel comprises basic wheel first wheel action frequency, level difference and time delay; the special wheel comprises special wheel first wheel action frequency, level difference and time delay.
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