CN112838613B - Control method, device and system for energy storage to participate in power grid frequency correction control - Google Patents

Control method, device and system for energy storage to participate in power grid frequency correction control Download PDF

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CN112838613B
CN112838613B CN202011583792.1A CN202011583792A CN112838613B CN 112838613 B CN112838613 B CN 112838613B CN 202011583792 A CN202011583792 A CN 202011583792A CN 112838613 B CN112838613 B CN 112838613B
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grid
energy storage
power
control
frequency correction
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CN112838613A (en
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周挺
郄朝辉
邹燕
李兆伟
罗凯明
李威
刘福锁
黄慧
丁钊
李海峰
石渠
吴雪莲
聂陆燕
吕亚洲
袁虎玲
刘林
周磊
张倩
赵彦丽
陈珏
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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State Grid Jiangsu Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—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
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a control method, a device and a system for energy storage to participate in power grid frequency correction control, wherein the method comprises the steps of obtaining power grid operation parameters and ranges; acquiring a power grid frequency correction control fixed value; dividing the energy storage control into different stages according to the frequency correction fixed value; and calculating the grid-connected power of the energy storage participation power grid frequency correction control in each stage based on the power grid operation parameters and range, the power grid frequency correction control fixed value and the frequency allowable fluctuation range after the power grid has a fault, controlling the energy storage based on the grid-connected power, and finishing the control of the energy storage participation power grid frequency correction control. The invention can utilize the active power quick response and flexible control capability of the stored energy to solve the problems that the frequency correction control can not be configured or the margin after configuration is low when the power grid has high new energy ratio.

Description

Control method, device and system for energy storage participating in power grid frequency correction control
Technical Field
The invention belongs to the technical field of automatic control of power systems, and particularly relates to a control method, a device and a system for energy storage to participate in power grid frequency correction control.
Background
More than 70% of water energy resources in China are concentrated in the southwest region, more than 80% of land wind energy is in the three-north region, and more than 60% of solar energy resources are in the northwest region and are 1000-4000 km away from the load center in the middle of the east. The basic national situation determines that the central development and remote power transmission of the north energy base in the west are the main part of future energy development in China, and the local development of the middle east is used as supplement. With the continuous development and utilization of new energy, the proportion of new energy in the total installed proportion is expected to be increased from 17% in 2017 to 38% in 2035. With the continuous improvement of the power generation ratio of new energy resources such as wind power, photovoltaic and the like, the direct-current cross-district power transmission scale is continuously enlarged, a large number of thermal power generation equipment is replaced, and the power grid frequency regulation capability is in a descending trend.
The energy storage power station can provide various services such as peak shaving, frequency modulation, standby, black start, demand response support and new energy consumption improvement for the operation of a power grid, and is an important means for improving the flexibility, economy and safety of a traditional power system. In the aspect of power grid frequency modulation, the energy storage power station takes a power electronic element as an interface, has rapid frequency adjustment capability and has great advantages in the aspect of power grid frequency modulation.
Due to the influence of randomness and volatility of new energy, the frequency correction control configuration of the power grid is more and more difficult to meet the requirements of multiple operation modes of the power grid, and the frequency correction control cannot be configured in some cases. The energy storage participating in the frequency correction control of the electrified network has great advantages, and how to improve the frequency correction control margin by the energy storage is not researched yet.
Disclosure of Invention
Aiming at the problems, the invention provides a control method, a device and a system for energy storage to participate in power grid frequency correction control, which can utilize the quick response and flexible control capability of stored functional power and solve the problems that the frequency correction control cannot be configured or the margin after configuration is low when the power grid is in a high new energy ratio.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a control method for energy storage to participate in grid frequency correction control, which includes:
acquiring power grid operation parameters and ranges;
acquiring a power grid frequency correction control fixed value;
dividing the energy storage control into different stages according to the frequency correction fixed value;
and calculating the grid-connected power of the energy storage participation in the grid frequency correction control at each stage based on the power grid operation parameters and ranges, the power grid frequency correction control fixed value and the frequency allowable fluctuation range after the power grid fault, controlling the energy storage based on the grid-connected power, and finishing the control of the energy storage participation in the grid frequency correction control.
Optionally, the grid operating parameters include: generalized rotating standby M of power grid, proportional coefficient K of speed regulator of generator, comprehensive time constant T of speed regulating system, system damping D and comprehensive load regulating effect coefficient K L The ratio of the output of the conventional unit to the total load is calculated;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure BDA0002865756630000021
wherein f is 0 For normal frequency of the grid, J i The rotor moment of inertia of the generator set i, N is the number of generators, and M is the generalized rotation standby of the power grid;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure BDA0002865756630000022
wherein, N 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the formula for calculating the proportional coefficient K of the speed regulator of the generator is as follows:
Figure BDA0002865756630000023
wherein, K i The generator speed regulator proportion coefficient of the generator set i;
the range of the proportional coefficient K of the generator speed regulator is [ K ] 1 ,K 2 ]The calculation formula is as follows:
Figure BDA0002865756630000024
wherein N is 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes; y is the number of the operation modes; n is a radical of 1 ＝N 1 ，N Y ＝N 2 ，
Figure BDA0002865756630000025
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure BDA0002865756630000026
wherein, T i The comprehensive time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure BDA0002865756630000031
the range of the system damping D is [ D ] 1 ,D 2 ]Obtaining according to the operation experience of the power grid;
load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtaining according to the operation experience of the power grid;
the ratio range of the output power of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
Optionally, the grid frequency correction control setpoint comprises a frequency correction setpoint and a load shedding proportion.
Optionally, the energy storage control is divided into different stages according to the frequency correction fixed value, specifically:
dividing the energy storage control into six stages according to the frequency correction constant value, wherein the six stages are respectively [ f 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]。
Optionally, the grid operation mode is adjusted to the grid operation mode S 2 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 2 Setting the load comprehensive regulation effect coefficient to be K L2 Setting the system damping to D 2 Setting the ratio eta of the output power to the total load of the conventional unit 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f ] 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into the β (β ═ 2,3,4,5) th stage (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating modes S 2 Gradually increasing the load cutting to make the steady-state frequency stabilized at fb, and cutting the load delta P by the system b ；
Calculating the absorbed power P of the stored energy in the beta stage 1 β Calculating a frequency correction control margin, wherein a calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein, f L And f H Respectively allowable fluctuation range of frequency after power grid faultMinimum and maximum values of;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure BDA0002865756630000032
Figure BDA0002865756630000041
wherein A is a coefficient operator;
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure BDA0002865756630000042
if it satisfies sigma-chi at [0,0.1]]Within the range, the calculation of the beta (beta is 2,3,4,5) stage of energy storage is completed, wherein chi is the precision of the control margin, and P is 1 β Is continuously iterated to be P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power of the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure BDA0002865756630000043
wherein f is max At the highest frequency of grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of the stored energy, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power at the current stage;
if σ - χ is not [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure BDA0002865756630000044
iteratively calculating the control quantity of the beta stage of energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]Step, the calculation formula of the grid-connected power of the stored energy is as follows;
Figure BDA0002865756630000045
optionally, the control method further includes: adjusting the power grid operation mode to a power grid operation mode S 1 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 1 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 1 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 1 Setting the load comprehensive regulation effect coefficient to be K L1 Setting the system damping to D 1 Setting the ratio eta of the output to the total load of the conventional unit 1 ；
Operating with the mains S 1 Starting from zero, the percentage of the incremental load shedding to the total load of the grid is s 1 ％+s 2 ％+s 3 ％+s 4 ％+s 5 % and whether the frequency of the simulation power grid can be recovered to f L ,f H ]Within the range;
if the grid frequency can be recovered to f L ,f H ]If the range is within, ending;
if the grid frequency cannot be restored to f L ,f H ]Within the range, the control margin χ is reduced by 0.01 each time until the grid frequency can be recovered to [ f [ ] L ,f H ]Within the range.
In a second aspect, the present invention provides a control device for energy storage to participate in grid frequency correction control, including:
the first acquisition module is used for acquiring the operating parameters and the range of the power grid;
the second acquisition module is used for acquiring a power grid frequency correction control fixed value;
the dividing module is used for dividing the energy storage control into different stages according to the frequency correction fixed value;
and the control module is used for calculating the grid-connected power of the energy storage participation in the grid frequency correction control at each stage based on the power grid operation parameters and ranges, the power grid frequency correction control fixed value and the frequency allowable fluctuation range after the power grid fault, controlling the energy storage based on the grid-connected power and finishing the control of the energy storage participation in the grid frequency correction control.
Optionally, the grid operating parameters include: generalized rotating standby M of power grid, proportional coefficient K of speed regulator of generator, comprehensive time constant T of speed regulating system, system damping D and comprehensive load regulating effect coefficient K L The ratio of the output of the conventional unit to the total load is calculated;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure BDA0002865756630000051
wherein, f 0 For normal frequency of the grid, J i The number of the generators is the rotor inertia of a generator set i, N is the number of the generators, and M is the generalized rotation standby of a power grid;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure BDA0002865756630000052
wherein N is 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the calculation formula of the proportional coefficient K of the speed regulator of the generator is as follows:
Figure BDA0002865756630000053
wherein, K i The generator speed regulator proportionality coefficient of the generator set i;
the generator speed regulator has a proportionality coefficient K in the range of[K 1 ,K 2 ]The calculation formula is as follows:
Figure BDA0002865756630000054
wherein N is 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes is set; y is the number of the operation modes; n is a radical of 1 ＝N 1 ，N Y ＝N 2 ，
Figure BDA0002865756630000055
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure BDA0002865756630000061
wherein, T i Synthesizing a time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure BDA0002865756630000062
the range of the system damping D is [ D ] 1 ,D 2 ]Obtaining according to the operation experience of the power grid;
load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtaining according to the operation experience of the power grid;
the ratio range of the output power of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
Optionally, the energy storage control is divided into six stages according to the frequency correction constant value, which are respectively [ f [ ] 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]；
Adjusting the power grid operation mode to a power grid operation mode S 2 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 2 Setting the load comprehensive regulation effect coefficient to be K L2 Setting system damping to D 2 Setting the ratio eta of the output to the total load of the conventional unit 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into the β (β ═ 2,3,4,5) th stage (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating modes S 2 Gradually increasing the load to cut off so as to stabilize the steady-state frequency at fb, wherein the system cuts off the load delta P b ；
Calculating the absorbed power P of the stored energy in the beta stage 1 β Calculating a frequency correction control margin, wherein a calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein f is L And f H Respectively the minimum value and the maximum value of the allowable fluctuation range of the frequency after the power grid fault;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure BDA0002865756630000071
Figure BDA0002865756630000072
wherein A is a coefficient operator;
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure BDA0002865756630000073
if it satisfies sigma-chi at [0,0.1]]Within the range, the calculation of the beta (beta is 2,3,4,5) stage of energy storage is completed, wherein chi is the precision of the control margin, and P is 1 β Is continuously iterated to be P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power of the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure BDA0002865756630000074
wherein f is max At the highest frequency of grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of the stored energy, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power of the current stage;
if σ - χ is not [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure BDA0002865756630000075
iteratively calculating the control quantity of the beta stage of the energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]Step, the calculation formula of the grid-connected power of the stored energy is as follows;
Figure BDA0002865756630000076
in a third aspect, the invention provides a control system for energy storage to participate in grid frequency correction control, which comprises a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of the first aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention brings the stored energy into the frequency correction control of the power grid, can utilize the quick response and flexible control capability of the stored functional power, and solves the problem that the frequency correction control cannot be configured or the margin after configuration is lower when the power grid is in high new energy occupancy.
Drawings
In order that the manner in which the present invention is more fully understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, wherein:
fig. 1 is a flowchart of a control method for energy storage to participate in grid frequency correction control according to an embodiment of the present invention;
fig. 2 is a second flowchart of a control method for energy storage to participate in grid frequency correction control according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The application of the principles of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
The embodiment of the invention provides a control method for energy storage to participate in power grid frequency correction control, which comprises the following steps as shown in figures 1-2:
(1) acquiring power grid operation parameters and ranges;
(2) acquiring a power grid frequency correction control fixed value;
(3) dividing the energy storage control into different stages according to the frequency correction fixed value;
(4) and calculating the grid-connected power of the energy storage participation power grid frequency correction control in each stage based on the power grid operation parameters and range, the power grid frequency correction control fixed value and the frequency allowable fluctuation range after the power grid has a fault, controlling the energy storage based on the grid-connected power, and finishing the control of the energy storage participation power grid frequency correction control.
In a specific implementation manner of the embodiment of the present invention, the power grid operation parameters include: generalized rotation standby M of power grid, proportional coefficient K of speed regulator of generator, comprehensive time constant T of speed regulation system, system damping D and comprehensive load regulation effect coefficient K L The ratio of the output of the conventional unit to the total load is calculated;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure BDA0002865756630000081
wherein f is 0 For the normal frequency of the grid, take f 0 ＝50Hz；J i The rotor moment of inertia of the generator set i can be obtained through generator parameters; n is the number of generators, and M is a power grid generalized rotation standby;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation method is as follows:
obtaining the number of generators in the range of N under different operation modes of the power grid 1 ,N 2 ]The range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure BDA0002865756630000091
wherein N is 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the formula for calculating the proportional coefficient K of the speed regulator of the generator is as follows:
Figure BDA0002865756630000092
wherein, K i The generator speed regulator proportionality coefficient of the generator set i;
the range calculation method of the generator speed regulator proportionality coefficient K comprises the following steps: according to the number range of the generators, the generators are divided into operation modes in Y on average, and the number of the generators is N 1 ,N 2 ,N 3 ...N Y In which N is 1 ＝N 1 ，N Y ＝N 2 ，
Figure BDA0002865756630000093
Wherein j-1, 2,3. The range of the generator speed regulator proportionality coefficient K 1 ,K 2 ]The calculation formula is as follows:
Figure BDA0002865756630000094
wherein, N 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes; y is the number of the operation modes; n is a radical of 1 ＝N 1 ，N Y ＝N 2 ，
Figure BDA0002865756630000095
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure BDA0002865756630000096
wherein, T i Synthesizing a time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure BDA0002865756630000097
the range of the system damping D is [ D ] 1 ,D 2 ]Obtained according to the operation experience of the power grid, and the general range is [0.01,0.03 ]]；
Load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtained according to the operation experience of the power grid, and the general range is
Figure BDA0002865756630000098
The ratio range of the output power of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
In a specific implementation manner of the embodiment of the present invention, the power grid frequency correction control fixed value includes a frequency correction fixed value and a load shedding ratio; the method for acquiring the power grid frequency correction control fixed value specifically comprises the following steps: and acquiring a current frequency correction control operation fixed value of the power grid from a power grid dispatching department. For example, the frequency correction control setting includes five rounds, which are: frequency correction 1 round fixed value f 1 Load-shedding 1-round ratio s 1 % of the total weight of the composition. The rest rounds are analogized in turn.
In a specific implementation manner of the embodiment of the present invention, the dividing the energy storage control into different stages according to the frequency correction fixed value specifically includes:
dividing the energy storage control into six stages according to the frequency correction constant value, wherein the six stages are respectively [ f 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]。
In a specific implementation manner of the embodiment of the present invention, the power grid operation manner is adjusted to the power grid operation manner S 2 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 2 Setting the load comprehensive regulation effect coefficient to be K L2 Setting the system damping to D 2 Setting the total output of the conventional unitRatio eta of load 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f ] 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into the β (β ═ 2,3,4,5) th stage (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating mode S 2 Gradually increasing the load to cut off and stabilizing the steady-state frequency at f b At this time, the system cuts off the load Δ P b (ii) a The energy storage is then guaranteed in the 2,3.. beta. -1 phase to determine the method action.
Calculating the absorbed power P of the stored energy in the beta stage 1 β Taking P for the first time in general 1 β 0. Calculating a frequency correction control margin, which comprises the following specific steps:
first, the formula M of the frequency correction control coefficient is given P Comprises the following steps:
Figure BDA0002865756630000101
wherein A is a coefficient operator.
The calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein f is L And f H Respectively the minimum value and the maximum value of the allowable fluctuation range of the frequency after the power grid fault;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure BDA0002865756630000111
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure BDA0002865756630000112
if the sigma-chi is satisfied at [0, 0.1%]Within the range, the beta (beta) stage of energy storage is completed by 2,3,4,5), wherein χ is the precision of the control margin, which is generally 0.05-0.15, and at this time, P is 1 β 0 is continuously iterated as P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power in the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure BDA0002865756630000113
wherein f is max At the highest frequency of the grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of energy storage, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power at the current stage;
if σ - χ is not in [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure BDA0002865756630000114
iteratively calculating the control quantity of the beta stage of the energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]A calculation formula of the grid-connected power of the stored energy is as follows;
Figure BDA0002865756630000115
in a specific implementation manner of the embodiment of the present invention, the control method further includes: transporting the power gridAdjusting the line mode to the power grid operation mode S 1 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 1 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 1 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 1 Setting the load comprehensive regulation effect coefficient as K L1 Setting system damping to D 1 Setting the ratio eta of the output power to the total load of the conventional unit 1 ；
By operation of the network S 1 Starting from zero, the percentage of load shedding to the total load of the grid is increased stepwise by s 1 ％+s 2 ％+s 3 ％+s 4 ％+s 5 Percent, whether the frequency of the simulation power grid can be recovered to [ f [ ] L ,f H ]Within the range;
if the grid frequency can be recovered to f L ,f H ]If the range is within the range, ending;
if the grid frequency cannot be restored to f L ,f H ]Within the range, the control margin χ is reduced by 0.01 each time until the grid frequency can be recovered to [ f L ,f H ]Within the range.
Example 2
The embodiment of the invention provides a control device for energy storage to participate in power grid frequency correction control, which comprises:
the first acquisition module is used for acquiring the operating parameters and the range of the power grid;
the second acquisition module is used for acquiring a power grid frequency correction control fixed value;
the dividing module is used for dividing the energy storage control into different stages according to the frequency correction fixed value;
and the control module is used for calculating the grid-connected power of the energy storage participation in the grid frequency correction control at each stage based on the power grid operation parameters and ranges, the power grid frequency correction control fixed value and the frequency allowable fluctuation range after the power grid fault, controlling the energy storage based on the grid-connected power and finishing the control of the energy storage participation in the grid frequency correction control.
In a specific implementation manner of the embodiment of the invention, the power grid operation parameterThe method comprises the following steps: generalized rotation standby M of power grid, proportional coefficient K of speed regulator of generator, comprehensive time constant T of speed regulation system, system damping D and comprehensive load regulation effect coefficient K L The ratio of the output of the conventional unit to the total load is increased;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure BDA0002865756630000121
wherein f is 0 For normal frequency of the grid, J i The rotor moment of inertia of the generator set i, N is the number of generators, and M is the generalized rotation standby of the power grid;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure BDA0002865756630000122
wherein N is 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the formula for calculating the proportional coefficient K of the speed regulator of the generator is as follows:
Figure BDA0002865756630000123
wherein, K i The generator speed regulator proportion coefficient of the generator set i;
the range of the proportional coefficient K of the generator speed regulator is [ K ] 1 ,K 2 ]The calculation formula is as follows:
Figure BDA0002865756630000124
wherein N is 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes is set; y is the number of operating modes; n is a radical of 1 ＝N 1 ，N Y ＝N 2 ，
Figure BDA0002865756630000125
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure BDA0002865756630000126
wherein, T i Synthesizing a time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure BDA0002865756630000131
the range of the system damping D is [ D ] 1 ,D 2 ]Obtaining according to the operation experience of the power grid;
load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtaining according to the operation experience of the power grid;
the proportion range of the output of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
In a specific implementation manner of the embodiment of the present invention, the energy storage control is divided into six stages according to the frequency correction constant, where the six stages are [ f [ ] 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]；
Adjusting the power grid operation mode to a power grid operation mode S 2 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 2 Setting the load comprehensive regulation effect coefficient as K L2 Setting system damping to D 2 Setting the total negative of the output of the conventional unitRatio of charges eta 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f ] 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into the β (β ═ 2,3,4,5) th stage (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating modes S 2 Gradually increasing the load to cut off so as to stabilize the steady-state frequency at fb, wherein the system cuts off the load delta P b ；
Calculating the absorbed power P of the stored energy in the beta stage 1 β Calculating a frequency correction control margin, wherein a calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein f is L And f H Respectively the minimum value and the maximum value of the allowable fluctuation range of the frequency after the power grid fault;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure BDA0002865756630000132
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure BDA0002865756630000141
if the sigma-chi is satisfied at [0, 0.1%]Within the range, the calculation of the beta (beta is 2,3,4,5) stage of energy storage is completed, wherein chi is the precision of the control margin, and P is 1 β Continuously iterated as P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power of the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure BDA0002865756630000142
wherein f is max At the highest frequency of the grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of the stored energy, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power at the current stage;
if σ - χ is not in [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure BDA0002865756630000143
iteratively calculating the control quantity of the beta stage of energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]Step, the calculation formula of the grid-connected power of the stored energy is as follows;
Figure BDA0002865756630000144
the rest of the process was the same as in example 1.
Example 3
Based on the same inventive concept as embodiment 1, the embodiment of the invention provides a control system for energy storage to participate in power grid frequency correction control, which comprises a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of embodiment 1.
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 so forth) 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.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A control method for energy storage to participate in grid frequency correction control is characterized by comprising the following steps:
acquiring power grid operation parameters and ranges;
acquiring a power grid frequency correction control fixed value;
dividing the energy storage control into different stages according to the frequency correction constant value;
calculating the grid-connected power of the energy storage participation in the grid frequency correction control at each stage based on the grid operation parameters and ranges, the grid frequency correction control fixed value and the allowable frequency fluctuation range after the grid fault, controlling the energy storage based on the grid-connected power, and finishing the control of the energy storage participation in the grid frequency correction control;
the grid operating parameters include: generalized rotating standby M of power grid, proportional coefficient K of speed regulator of generator, comprehensive time constant T of speed regulating system, system damping D and comprehensive load regulating effect coefficient K L The ratio of the output of the conventional unit to the total load is increased;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure FDA0003711564480000011
wherein f is 0 For normal frequency of the grid, J i The number of the generators is the rotor inertia of a generator set i, N is the number of the generators, and M is the generalized rotation standby of a power grid;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure FDA0003711564480000012
wherein, N 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the formula for calculating the proportional coefficient K of the speed regulator of the generator is as follows:
Figure FDA0003711564480000013
wherein, K i The generator speed regulator proportion coefficient of the generator set i;
the range of the proportional coefficient K of the generator speed regulator is [ K ] 1 ,K 2 ]The calculation formula is as follows:
Figure FDA0003711564480000014
wherein, N 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes; y is the number of the operation modes; n is a radical of 1 ＝N 1 ，N Y ＝N 2 ，
Figure FDA0003711564480000015
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure FDA0003711564480000021
wherein, T i Synthesizing a time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure FDA0003711564480000022
the range of the system damping D is [ D ] 1 ,D 2 ]Obtaining according to the operation experience of the power grid;
load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtaining according to the operation experience of the power grid;
the ratio range of the output power of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
2. The method for controlling the participation of energy storage in the grid frequency correction control as claimed in claim 1, wherein: the grid frequency correction control fixed value comprises a frequency correction fixed value and a load shedding proportion.
3. The method for controlling the participation of energy storage in the grid frequency correction control as claimed in claim 1, wherein: the energy storage control is divided into different stages according to the frequency correction fixed value, specifically:
dividing the energy storage control into six stages according to the frequency correction constant value, wherein the six stages are respectively [ f 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]。
4. The method for controlling the participation of energy storage in the grid frequency correction control as claimed in claim 3, wherein: adjusting the power grid operation mode to a power grid operation mode S 2 The process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 2 Setting the load comprehensive regulation effect coefficient as K L2 Setting the system damping to D 2 Setting the ratio eta of the output power to the total load of the conventional unit 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f ] 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into the β (β ═ 2,3,4,5) th stage (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating mode S 2 Gradually increasing the load to cut off so as to stabilize the steady-state frequency at fb, wherein the system cuts off the load delta P b (ii) a Calculating the absorbed power P of the stored energy in the beta stage 1 β Calculating a frequency correction control margin, wherein a calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein f is L And f H Respectively the minimum value and the maximum value of the allowable fluctuation range of the frequency after the power grid fault;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure FDA0003711564480000031
Figure FDA0003711564480000032
wherein A is a coefficient operator;
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure FDA0003711564480000033
if the sigma-chi is satisfied at [0, 0.1%]Within the range, the calculation of the beta (beta is 2,3,4,5) stage of energy storage is completed, wherein chi is the precision of the control margin, and P is 1 β Continuously iterated as P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power in the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure FDA0003711564480000034
wherein f is max At the highest frequency of the grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of the stored energy, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power at the current stage; if σ - χ is not in [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure FDA0003711564480000035
iteratively calculating the control quantity of the beta stage of the energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]A calculation formula of the grid-connected power of the stored energy is as follows;
Figure FDA0003711564480000036
5. the control method for participating in grid frequency correction control of energy storage according to claim 1The method, characterized in that the control method further comprises: adjusting the power grid operation mode to a power grid operation mode S 1 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 1 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 1 Adjusting the comprehensive time constant of all the generator speed regulating systems to be T 1 Setting the load comprehensive regulation effect coefficient to be K L1 Setting the system damping to D 1 Setting the ratio eta of the output power to the total load of the conventional unit 1 ；
Operating with the mains S 1 Starting from zero, the percentage of the incremental load shedding to the total load of the grid is s 1 ％+s 2 ％+s 3 ％+s 4 ％+s 5 % and whether the frequency of the simulation power grid can be recovered to f L ,f H ]Within the range;
if the grid frequency can be recovered to f L ,f H ]If the range is within, ending;
if the grid frequency cannot be restored to f L ,f H ]Within the range, the control margin χ is reduced by 0.01 each time until the grid frequency can be recovered to [ f L ,f H ]Within the range.
6. A control device for energy storage participation grid frequency correction control is characterized by comprising:
the first acquisition module is used for acquiring the operating parameters and the range of the power grid;
the second acquisition module is used for acquiring a power grid frequency correction control fixed value;
the dividing module is used for dividing the energy storage control into different stages according to the frequency correction fixed value;
the control module is used for calculating the grid-connected power of the energy storage participation power grid frequency correction control in each stage based on the power grid operation parameters and range, the power grid frequency correction control fixed value and the power grid fault-later frequency allowable fluctuation range, controlling the energy storage based on the grid-connected power and finishing the control of the energy storage participation power grid frequency correction control;
the grid operating parameters include: electric networkGeneralized rotation standby M, generator speed regulator proportional coefficient K, speed regulation system comprehensive time constant T, system damping D and load comprehensive regulation effect coefficient K L The ratio of the output of the conventional unit to the total load is increased;
the calculation formula of the power grid generalized rotation standby is as follows:
Figure FDA0003711564480000041
wherein, f 0 For normal frequency of the grid, J i The number of the generators is the rotor inertia of a generator set i, N is the number of the generators, and M is the generalized rotation standby of a power grid;
the range of the power grid generalized rotation standby M is [ M 1 ,M 2 ]The calculation formula is as follows:
Figure FDA0003711564480000042
wherein, N 1 Is the minimum number of generators, N 2 The maximum value of the number of the generators;
the formula for calculating the proportional coefficient K of the speed regulator of the generator is as follows:
Figure FDA0003711564480000043
wherein, K i The generator speed regulator proportion coefficient of the generator set i;
the range of the proportional coefficient K of the speed regulator of the generator is [ K ] 1 ,K 2 ]The calculation formula is as follows:
Figure FDA0003711564480000051
wherein N is 1 ,N 2 ,N 3 ...N Y The number of generators in different operation modes is set; y is the number of the operation modes; n is a radical of hydrogen 1 ＝N 1 ，N Y ＝N 2 ，
Figure FDA0003711564480000052
The calculation formula of the comprehensive time constant T of the speed regulating system is as follows:
Figure FDA0003711564480000053
wherein, T i Synthesizing a time constant of a speed regulating system of the generator set i;
the range of the comprehensive time constant T of the speed regulating system is [ T 1 ,T 2 ]The calculation formula is as follows:
Figure FDA0003711564480000054
the range of the system damping D is [ D ] 1 ,D 2 ]Obtaining according to the operation experience of the power grid;
load integrated regulation effect coefficient K L In the range of [ K L1 ,K L2 ]Obtaining according to the operation experience of the power grid;
the proportion range of the output of the conventional unit to the total load is [ eta ] 1 ,η 2 ]。
7. The control device of claim 6, wherein the energy storage control is divided into six stages according to the frequency correction constant value, wherein the six stages are [ f [ ] 0 ,f 1 ]，(f 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]，(f 5 ,∞]；
Adjusting the power grid operation mode to a power grid operation mode S 2 The adjusting process specifically comprises the following steps: obtaining power grid generalized rotation standby M 2 The proportional coefficient of all the speed regulators of the generators is adjusted to be K 2 Adjusting all generator speed control systemsThe total time constant is T 2 Setting the load comprehensive regulation effect coefficient to be K L2 Setting system damping to D 2 Setting the ratio eta of the output to the total load of the conventional unit 2 ；
The method for calculating the grid-connected power of each stage of energy storage participating in the grid frequency correction control comprises the following steps:
in [ f 0 ,f 1 ]Stage, the energy storage does not act, and the grid-connected power is 0;
in (f) 1 ,f 2 ]，(f 2 ,f 3 ]，(f 3 ,f 4 ]，(f 4 ,f 5 ]The stages are the same as the energy storage control method, and are unified into β (β ═ 2,3,4,5) stages (fa, fb)]The grid-connected power calculation method specifically comprises the following steps:
using grid operating mode S 2 Gradually increasing the load to cut off so as to stabilize the steady-state frequency at fb, wherein the system cuts off the load delta P b ；
Calculating the absorbed power P of the stored energy in the beta stage 1 β Calculating a frequency correction control margin, wherein a calculation formula of the frequency correction control margin is as follows:
σ＝f H -f L -(h(t p )-h(∞))
wherein, f L And f H Respectively the minimum value and the maximum value of the allowable fluctuation range of the frequency after the power grid fault;
h(t p ) For the maximum control quantity, the calculation formula is as follows:
Figure FDA0003711564480000061
Figure FDA0003711564480000062
wherein A is a coefficient operator;
h (∞) is the minimum control quantity, and the calculation formula is as follows:
Figure FDA0003711564480000063
if it satisfies sigma-chi at [0,0.1]]Within the range, the calculation of the beta (beta is 2,3,4,5) stage of energy storage is completed, wherein chi is the precision of the control margin, and P is 1 β Continuously iterated as P 2 β ，P 3 β …P ∞ β ；
The calculation formula of the energy storage grid-connected power of the energy storage beta (beta is 2,3,4,5) stage (fa, fb) is as follows:
Figure FDA0003711564480000064
wherein f is max At the highest frequency of grid frequency variation, P β ∞ For a final determined amount of absorbed power in the beta phase of the stored energy, P β-1 ∞ Absorbing power quantity for the finally determined beta-1 stage of energy storage, wherein f is a frequency range, and P is energy storage grid-connected power at the current stage; if σ - χ is not [0,0.1]]Within the range, the absorbed power quantity P in the beta stage of the energy storage is redetermined 1 β The calculation formula is as follows:
Figure FDA0003711564480000065
iteratively calculating the control quantity of the beta stage of the energy storage until the sigma-chi is in the range of [0,0.1 ];
in (f) 5 ,∞]A calculation formula of the grid-connected power of the stored energy is as follows;
Figure FDA0003711564480000066
8. a control system for energy storage to participate in grid frequency correction control is characterized by comprising a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 5.
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