CN112762757B - Electric heat accumulation control method participating in frequency modulation and peak shaving - Google Patents
Electric heat accumulation control method participating in frequency modulation and peak shaving Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- 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
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Abstract
The invention relates to an electric heat accumulation control method participating in frequency modulation and peak shaving, which comprises the following steps of: the method comprises the steps of predetermining three control modes of electric heat storage, selecting an electric heat storage control mode in which the electric heat storage participates according to the current power grid state, and carrying out input and cut-off control on the electric heat storage according to the selected electric heat storage control mode, wherein the three control modes of the electric heat storage comprise a frequency modulation control mode, a scheduling control mode and a deep modulation control mode. The electric heat storage control method participating in frequency modulation and peak regulation provided by the invention has three control modes: the frequency modulation control mode with the participation of the electric heat accumulation, the manual control mode with the participation of the electric heat accumulation and the deep modulation control mode with the participation of the electric heat accumulation can assist the thermal power to participate in the frequency modulation and peak regulation so as to meet the requirement of the frequency modulation and peak regulation of the power grid, maintain the deviation of the frequency of the power grid system and the standard frequency to be stable within an allowable range and ensure the safe operation of the power grid.
Description
Technical Field
The invention relates to the technical field of operation and control of an electric power system, in particular to an electric heat storage control method, and belongs to the technical field of electric power system dispatching automation.
Background
With the rapid increase of the scale of the power grid in China and the addition of various new energy sources, the regulation and control working pressure of the scheduling personnel is higher and higher, and the mode mainly depending on manual scheduling is difficult to adapt gradually. The power grid comprising large-scale wind power has the characteristics of the power grid in the links of peak-valley regulation, frequency control, voltage control, maximum electric heat storage effect exertion and the like, and the traditional dispatching automation system cannot completely adapt to the dispatching operation requirement.
In some areas, the power grid is mainly based on thermal power, the flexibility of the power grid is poor, and during the heating period in winter, the downward peak regulation capability of a cogeneration unit is insufficient, so that large-scale wind abandonment is caused in the low ebb period at night.
The electric heat storage is one of effective means for solving the problem of wind abandon by participating in the control of the power grid, but the current literature and products do not specifically research on the control of the electric heat storage.
Disclosure of Invention
The invention provides an electric heat accumulation control method participating in frequency modulation and peak shaving, aiming at the technical problems in the electric heat accumulation control technology.
The invention adopts the following technical scheme to provide an electric heat accumulation control method participating in frequency modulation and peak shaving, which comprises the following steps: the method comprises the steps of predetermining three control modes of electric heat storage, selecting an electric heat storage control mode in which the electric heat storage participates according to the current power grid state, and carrying out input and cut-off control on the electric heat storage according to the selected electric heat storage control mode, wherein the three control modes of the electric heat storage comprise a frequency modulation control mode, a scheduling control mode and a deep modulation control mode.
Further, the deep regulation and control mode comprises the following specific steps:
judging whether the frequency area of the whole network is in deep adjustment or not, and if so, acquiring quotations of each power plant according to the limit value of the gear in which the frequency area is located; judging whether the thermal power reserve is sufficient or not according to quoted price, and if the thermal power reserve is sufficient, not performing electric heat storage regulation; and if the thermal power supply is insufficient, putting in or cutting off the electric heat storage according to a preset switching strategy to finish electric heat storage regulation.
Still further, the switching strategy includes: when the thermal power is at a specific fixed value, judging whether the condition of formula (1) is met, and if the condition of formula (1) is met, determining the combination of the input electric heat storage, wherein formula (1) is expressed as follows:
wherein P is down,i The quotation gear i of the thermal storage power plant and all units before are reserved, and the quotation gear i is expressed as follows:
wherein P is G,K Actual capacity of the K-th quotation unit, L min,k A lower control limit, L, of the k-th quotation unit under the set of fixed values down Set minimum hold-down value; Δ P is the total turndown power value, R is the set ACE emergency limitThe value of the one or more of the one,
further, if the condition of the formula (1) is satisfied, it is judged that the electric-thermal storage combination can be put into use by the formula (2),
wherein P is des,i For the total target output of the quotation gear i and all previous units of the thermal storage power plant, namely
P N,i Is the installed capacity of the quotation gear i and all the previous units of the thermal storage power plant t,min For minimum load factor, eta, at different set values t,max For the maximum load rate at different setpoints: p is a radical of formula heat For a sequence of combinations of adjustable capacities of the individual electric heat storage units, when the adjustable capacity of a combination of an electric heat storage unit does not satisfy formula (2), from the sequence of combinations p heat The combination is deleted.
Further, it is judged whether the condition of the formula (3) is satisfied, and if the condition of the formula (3) is satisfied, it is determined that the electric heat storage combination can be cut,
wherein P is up,i Indicate that the thermal storage power plant is reserve on quotation gear i and all units thereafter, show as:
P G,k actual capacity of the K-th quotation unit, L max,k The upper control limit of the k-th quotation unit under the set of fixed values, R is the total quotation gear number, L up For the set minimum up reserve value, Δ P is the total up power value and R is the set ACE emergency zone limit.
Further, when the condition of the formula (3) is satisfied, the electric/thermal storage combination which can be cut off is determined by the formula (4),
wherein P is des,i The total target output of all units at and after the quotation gear i of the thermal storage power plant is expressed as follows:
P N,i for the installed capacity, p, of all units at and after the quotation gear i of the thermal storage power plant heat The adjustable capacity combination sequence of each electric heat storage unit;
when the combined adjustable capacity of a certain electric heat storage unit does not satisfy the formula (4) from the combination sequence p heat The combination is deleted.
Further, the scheduling control mode specifically includes the following steps: acquiring target electric quantity;
comparing the current active power with the target value, and if the active power is smaller than the target value, inputting electricity for heat storage; if the active power is larger than the target value, removing the electric heat accumulation; and if the active power is equal to the target electric quantity, stopping inputting or cutting off the electric heat storage.
Further, the frequency modulation control mode specifically includes the following steps:
acquiring power generation sequence positions of power supplies where the electric heat storage is located; judging whether each power supply standby before the electricity heat storage power generation sequence meets the requirement of the whole network regulating quantity; if all power supplies before the electric heat storage power generation sequence cannot meet the requirement of the whole network for standby, the electric heat storage participates in regulation; and (4) inputting or cutting off the electric heat storage according to the adjustment quantity of the whole network.
The invention has the following beneficial technical effects: the electric heat accumulation control method participating in frequency modulation and peak shaving provided by the invention has three control modes: the frequency modulation control mode with the participation of the electric heat accumulation, the manual control mode with the participation of the electric heat accumulation and the deep modulation control mode with the participation of the electric heat accumulation can assist the thermal power to participate in the frequency modulation and peak regulation so as to meet the requirement of the frequency modulation and peak regulation of the power grid, maintain the deviation of the frequency of the power grid system and the standard frequency to be stable within an allowable range and ensure the safe operation of the power grid.
Drawings
Fig. 1 is a schematic flow chart of an electrical heat storage control method participating in frequency modulation and peak shaving according to an embodiment of the present invention;
fig. 2 is a schematic diagram of three control modes of an electrical heat storage control method participating in frequency modulation and peak shaving according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a frequency modulation control mode in which electric heat storage participates according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a scheduling control mode involving electrical heat storage according to an embodiment of the present invention;
fig. 5 is a flow chart of a deep regulation control mode involving the participation of the electric heat accumulation in the embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and the specific examples.
Automatic Generation Control (AGC): the system frequency and/or the junctor exchange power are maintained within a certain target range through automatic adjustment of the active output of the generator set in the scheduling area.
In the prior art, according to the magnitudes of the ACE and the frequency deviation and a set threshold value, an area is divided into a stable area, an emergency area and an accident area. When the frequency is in an emergency area or an accident area, different power generation sequence positions are obtained, and when other power supplies are insufficient for standby, the electric heat storage participates in power grid regulation, so that the power grid can rapidly and safely carry out peak clipping and valley filling.
The electric heat storage control method provided by the invention mainly has three electric heat storage control modes: the system comprises an electric heat storage participation frequency modulation control mode, an electric heat storage participation scheduling control mode and an electric heat storage participation deep modulation control mode. The present invention will be described in detail below.
Example 1: an electric heat accumulation control method participating in frequency modulation and peak shaving is shown in figure 1 and comprises the following steps: the method comprises the steps of predetermining three control modes of electric heat storage, selecting an electric heat storage control mode in which the electric heat storage participates according to the current power grid state, and carrying out input and cut-off control on the electric heat storage according to the selected electric heat storage control mode, wherein the three control modes of the electric heat storage comprise a frequency modulation control mode, a scheduling control mode and a deep modulation control mode.
The frequency modulation control mode in which mode one electric heat accumulation participates is described as follows (as shown in fig. 3):
because the electric heat storage is generally used in the power grid in the heating period and the output regulation speed is low, the regulation function of the electric heat storage is started only when the system enters an emergency area, the electric heat storage is used as a frequency modulation mode to participate in the frequency modulation of the power grid when the power supplies such as thermal power, new energy and the like are insufficient in the emergency area, and the adjustment quantity demand of the system is counted in the switching state.
The frequency modulation control mode is used for carrying out partition control on the electric heat accumulation according to the emergency degree of power grid frequency adjustment. When the frequencies are respectively in a stable region, acquiring an electric heat accumulation power generation sequence, wherein the electric heat accumulation does not participate in regulation under general conditions; when the frequency enters an emergency area and the standby power supply of the thermal power station is insufficient, the electric heat accumulation is adjusted; when the frequency enters the accident region, the electric heat accumulation participates in the frequency modulation regulation.
Mode two the dispatch control mode of electric thermal storage participation is introduced as follows (as shown in fig. 4):
in the manual control mode, a dispatcher manually inputs a target value of the electric heat storage device, and the on-off state of the electric heat storage device is manually determined by comparing the current power grid regulation requirement with the electric heat storage standby condition. See in particular the scheduling control mode flow chart of fig. 4.
Mode three deep regulation mode with electric heat storage participation is introduced as follows:
the deep-tuning control mode is to judge whether the current time enters deep tuning or not according to the current power grid state. When the electric heat storage enters deep regulation, the quotation of each thermal power generating unit is obtained according to the current number-th set of limit values, the regulating strategy of the thermal power generating unit is determined according to the quotation, and when the thermal power generating unit cannot meet the regulating quantity of the whole power grid, the electric heat storage is deeply regulated through the electric heat input and output, so that the whole power grid can be quickly recovered. See in particular the following flow chart of the deep regulation mode of fig. 5.
Example 2: on the basis of the embodiment 1, in the embodiment, firstly, whether the control mode is the deep regulation control mode is judged, and if the control mode is the deep regulation control mode, the electric heat storage control is carried out according to the deep regulation control mode; if not, then judging whether the control mode is a dispatching control mode, if so, carrying out electric heat storage control according to the dispatching control mode; if not, whether the mode is the frequency modulation control mode is judged, if yes, the electric heat storage control is carried out according to the frequency modulation control mode.
The specific control process of the deep control mode is described in detail below.
The specific control process of the deep control mode is described in detail below.
The method comprises the following specific steps:
the method comprises the following steps: judging a frequency area: whether the whole network is in deep tone is judged, and if the whole network is in deep tone, the quotation of each power plant is obtained according to the second gear limit value.
Step two: judging whether the thermal power is sufficient for standby, and if the thermal power is sufficient for standby, no electric heat storage adjustment is needed; if the thermal power is not sufficient for future use, then electrical thermal storage regulation is required.
Step three: switching electric heat storage is carried out according to whether the thermal power backup is sufficient or not, and the method comprises the following steps
And (3) investment strategy: when the thermal power is at a certain set of fixed value, if the conditions are met:
several important parameters in the formula are as follows:
P down,i the quotation gear i and all previous units of the thermal storage power plant are reserved, namely the quotation gear i and all previous units are represented as
Wherein P is G,K Actual capacity of the quotation unit for the kth gear, L min,k A lower control limit, L, of the kth quotation unit under the set of fixed values down Set the lowest lower reserve value. Δ P is the area turndown requirement, i.e. the total turndown power value.
R is the set ACE emergency zone limit.
When the formula (1) is satisfied, the electric heat accumulation combination p can be put into heat The determination is as follows:
several important parameters in the formula are as follows:
P des,i the total target output for the quotation gear i and all previous units of the thermal storage power plant, namely
P N,i The method is characterized by comprising the steps of obtaining the installed capacity of all previous units and the quotation gear i where the thermal storage power plant is located. Eta t,min 、η t,max The minimum load rate and the maximum load rate for different set values are listed as follows:
p heat the calculation is that according to the measurement information of the electric heat storage boiler, an electric heat storage adjustable capacity sequence is determined:
p heat ＝{P1,P2,P3,P4,[P1+P2],[P1+P3],…,[P1+P2+P3+P4]}
note: assuming that 4 heat storage units are provided, P1, P2, P3 and P4 represent the capacities of the heat storage units in a certain field, and [ P1+ P2], [ P1+ P3] and the like represent the adjustable capacities of the freely combined heat storage units.
From the sequence p when a certain combined capacity does not satisfy formula (2) heat To delete the combination.
Excision strategy:
when the thermal power is at a certain set of fixed value, if the conditions are met:
several important parameters in the formula are as follows:
P up,i means that the thermal storage power plant is reserved on all units at and after the quotation gear i, namely
Wherein P is G,k Actual output of a unit, L max,k And R is the control upper limit of the unit under the set of fixed values, and R is the total quotation gear number. L is up The set minimum up-regulation reserve value is set. Δ P is the area up-regulation requirement, i.e. the total up-regulation power value. R is the set ACE emergency zone limit.
When the formula (3) is satisfied, the electric heat storage combination p can be cut off heat The determination is as follows:
equation (4) is the same as equation (2), but several important parameters are defined slightly differently in the equations:
P des,i for the total target output of all units at and after the quoted price i of the thermal storage power plant, i.e. the total target output
P N,i The installed capacities of all the units at the quotation gear i and later of the thermal storage power plant are obtained. p is a radical of formula heat The calculation is that according to the measurement information of the electric heat storage boiler, an electric heat storage adjustable capacity sequence is determined:
p heat ＝{P1,P2,P3,P4,[P1+P2],[P1+P3],…,[P1+P2+P3+P4]}
note: assuming that 4 heat storage units, P1, P2, P3 and P4, represent the capacities of the respective heat storage units in a certain field, and [ P1+ P2], [ P1+ P3], etc., represent the adjustable capacities of the respective heat storage units in a freely combined manner.
From the sequence p when a certain combined capacity does not satisfy formula (4) heat The combination is deleted.
Example 3: on the basis of embodiment 1 or embodiment 2, a specific control process of a scheduling control mode in the electrical thermal storage control method participating in frequency modulation and peak shaving (as shown in fig. 2) provided by this embodiment is described in detail below, where the specific steps of the scheduling control mode are as follows:
the method comprises the following steps: inputting a target electric quantity;
step two: comparing the current active power with the target value, and if the active power is smaller than the target value, inputting electricity for heat storage; if the active power is larger than the target value, cutting off the electric heat accumulation; and if the active power is equal to the target value, stopping charging/cutting off the electricity for heat storage.
The specific control process of the frequency control mode (i.e., the fm control mode) is described in detail below. The frequency modulation control mode comprises the following specific steps:
the method comprises the following steps: acquiring power generation sequence positions of power supplies where the electric heat storage is located;
step two: judging whether each power supply standby before the electricity and heat storage power generation sequence meets the requirement of the whole network regulating quantity;
step three: if the standby power supplies before the electric heat storage power generation sequence cannot meet the requirement of the whole network, the electric heat storage participates in regulation;
step four: and charging/cutting electricity according to the adjustment amount of the whole network for heat storage.
The electric heat accumulation control method provided by the invention can realize that auxiliary thermal power participates in frequency modulation and peak regulation according to electric heat accumulation so as to meet the requirement of frequency modulation and peak regulation of the power grid, and the deviation of the power grid system frequency and the standard frequency is kept stable within an allowable range on the premise of reducing wind and light abandoning, so that the power grid can operate safely.
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.
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.
Claims (4)
1. The electric heat accumulation control method participating in frequency modulation and peak shaving is characterized by comprising the following steps of: the method comprises the steps of predetermining three control modes of electric heat storage, selecting an electric heat storage control mode in which the electric heat storage participates according to the current power grid state, and performing input and cut-off control on the electric heat storage according to the selected electric heat storage control mode, wherein the three control modes of the electric heat storage comprise a frequency modulation control mode, a scheduling control mode and a deep modulation control mode;
the deep regulation and control mode comprises the following specific steps:
judging whether the frequency area of the whole network is in deep adjustment or not, and if so, acquiring quotations of each power plant according to the limit value of the gear in which the frequency area is located; judging whether the thermal power reserve is sufficient or not according to quoted price, and if the thermal power reserve is sufficient, not performing electric heat storage regulation; if the thermal power is insufficient, inputting or cutting off the electric heat storage according to a preset switching strategy to finish electric heat storage regulation;
the switching strategy comprises the following steps: when the thermal power is at a specific fixed value, judging whether the condition of formula (1) is met, and if the condition of formula (1) is met, determining the combination of the input electric heat storage, wherein formula (1) is expressed as follows:
wherein P is down,i The quotation gear i of the thermal storage power plant and all units before are reserved, and the quotation gear i is expressed as follows:
wherein P is G,K For the actual output of the quotation unit of the k-th grade,
L min,k a lower control limit, L, of the k-th quotation unit under the set of fixed values down Set minimum hold-down value; delta P is a total down-regulation power value, and R is a set ACE emergency area limit value;
the scheduling control mode specifically includes the following steps: acquiring target electric quantity;
comparing the current active power with the target value, and if the active power is smaller than the target value, inputting electricity for heat storage; if the active power is larger than the target value, removing the electric heat accumulation; if the active power is equal to the target electric quantity, stopping inputting or cutting off the electric heat storage;
the frequency modulation control mode specifically comprises the following steps:
acquiring power generation sequence positions of power supplies where the electric heat storage is located; judging whether each power supply standby before the electricity and heat storage power generation sequence meets the requirement of the whole network regulating quantity; if all power supplies before the electric heat storage power generation sequence cannot meet the requirement of the whole network for standby, the electric heat storage participates in regulation; and (4) inputting or cutting off the electric heat storage according to the adjustment quantity of the whole network.
2. A method as claimed in claim 1, wherein the method further comprises the step of controlling the electrical storage according to the frequency modulation peak shaving,
if the condition of the formula (1) is satisfied, the formula (2) is used to judge that the electric heat storage combination can be put into,
wherein P is des,i For the total target output of the quotation gear i and all previous units of the thermal storage power plant, namely
P N,i Is the installed capacity of the quotation gear i and all the previous units of the thermal storage power plant t,min For minimum load factor, eta, at different set values t,max Maximum load rate for different sets of set values: p is a radical of heat For a sequence of combinations of adjustable capacities of the individual electric heat storage units, when the adjustable capacity of a combination of an electric heat storage unit does not satisfy formula (2), from the sequence of combinations p heat The combination is deleted.
3. The method according to claim 1, wherein the method determines whether the condition of formula (3) is satisfied, and determines that the electric storage combination can be cut off if the condition of formula (3) is satisfied,
wherein P is up,i The method refers to that the thermal storage power plant is standby on a quotation gear i and all units behind, and is represented as follows:
P G,k actual capacity of the K-th quotation unit, L max,k The control upper limit of the kth quotation unit under the set of fixed values, R is the total quotation gear number, L up For the set minimum up reserve value, Δ P is the total up power value and R is the set ACE emergency zone limit.
4. A method for controlling electric heat accumulation participating in frequency modulation peak shaving according to claim 3, characterized in that if the condition of formula (3) is satisfied, the electric heat accumulation combination can be cut off by using formula (4),
wherein P is des,i The total target output of all units at and after the quotation gear i of the thermal storage power plant is expressed as follows:
P N,i for the installed capacity, p, of all units at and after the quotation gear i of the thermal storage power plant heat The adjustable capacity combination sequence of each electric heat storage unit;
when the combined adjustable capacity of a certain electric heat storage unit does not satisfy the formula (4) from the combined sequence p heat The combination is deleted.
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