A new energy power system frequency modulation auxiliary service scheduling method and system

Abstract

This invention discloses a method and system for dispatching frequency regulation ancillary services in a new energy power system, belonging to the field of power system technology. The method includes: calculating and determining a new energy power system dispatch scheme based on the new energy power system load, new energy output, system frequency regulation service demand, and a new energy power system dispatch model, with the objective of minimizing system operating costs and system frequency regulation ancillary service deficit; wherein, system operating costs include generation costs and frequency regulation ancillary service costs, the frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generators; the system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generators. The final determined power system dispatch scheme can ensure the stable and economical operation of the power system, solving the technical problem that traditional methods cannot determine the optimal power dispatch scheme.

Description

Technical Field

[0001] This invention relates to the field of power system automatic control technology, and in particular to a method and system for frequency regulation auxiliary service dispatching in a new energy power system. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] The random fluctuations and non-storability of wind and solar energy resources determine the random fluctuations in wind and solar power generation. When large-scale renewable energy participates in the power system's power balance, conventional generating units still need to adjust their output to smooth out the fluctuations in renewable energy output and maintain system balance. When load and renewable energy output fluctuations exceed the power system's adjustment range, it is necessary to restrict renewable energy output, which leads to wind and solar curtailment.

[0004] In related technologies, when large-scale wind power, photovoltaic and other new energy sources are integrated into the power grid for power system dispatch, only the generation cost is considered, without taking into account the shortage of frequency regulation ancillary services. This results in the final dispatch scheme not being the optimal one and failing to guarantee the stable and economical operation of the power system. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a method and system for scheduling frequency regulation ancillary services in a new energy power system. By aiming to minimize system operating costs and the deficit in system frequency regulation ancillary services, the final determined power system scheduling scheme can ensure the stable and economical operation of the power system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Firstly, a frequency regulation auxiliary service dispatching method for new energy power systems is proposed, including:

[0008] Obtain information on the load, output, and frequency regulation service requirements of the new energy power system;

[0009] With the goal of minimizing system operating costs and system frequency regulation ancillary service deficit, the new energy power system dispatch scheme is calculated and determined based on the new energy power system load, new energy output, system frequency regulation service demand, and new energy power system dispatch model.

[0010] The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator.

[0011] Furthermore, the frequency regulation auxiliary services provided by the generator include primary frequency regulation auxiliary services and secondary frequency regulation auxiliary services.

[0012] Furthermore, based on the scheduling scheme, the total cost of frequency modulation ancillary services for the generators that can provide frequency modulation ancillary services, excluding the generators that provide frequency modulation ancillary services, is determined, as well as the remaining total cost of frequency modulation ancillary services after deducting the cost of frequency modulation ancillary services for the generators that provide frequency modulation ancillary services from the total cost of frequency modulation ancillary services for all generators that can provide frequency modulation ancillary services in the system.

[0013] Calculate the difference between the two total costs as compensation for the generators providing frequency regulation ancillary services.

[0014] Furthermore, the new energy power system dispatch model includes power balance constraints, generator unit operation constraints, constraints related to frequency regulation ancillary services provided by new energy power generators, and system ancillary service constraints.

[0015] Furthermore, generator set operating constraints include generator set output constraints, ramping constraints, minimum start-stop time constraints, and start-stop cost constraints.

[0016] Furthermore, the constraints related to the frequency regulation ancillary services provided by renewable energy power generators include the capacity constraints of primary frequency regulation services provided by renewable energy power generators, renewable energy output constraints, the capacity constraints of secondary frequency regulation services provided by renewable energy power generators, and the power generation capacity constraints when renewable energy power generators provide frequency regulation services.

[0017] Secondly, a frequency regulation auxiliary service dispatching system for new energy power systems is proposed, including:

[0018] The data acquisition unit is used to acquire the load, power output, and frequency regulation service requirements of the new energy power system.

[0019] The dispatch scheme determination unit is used to calculate and determine the dispatch scheme of the new energy power system with the goal of minimizing the system operating cost and the system frequency regulation ancillary service deficit, based on the load of the new energy power system, the output of new energy, the system frequency regulation service demand and the dispatch model of the new energy power system.

[0020] The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator.

[0021] Thirdly, a computer device is proposed, the device comprising:

[0022] A processor, adapted to execute computer programs;

[0023] A computer-readable storage medium storing a computer program, which, when executed by the processor, implements a frequency regulation auxiliary service scheduling method for a new energy power system as proposed in the first aspect.

[0024] Fourthly, a computer-readable storage medium is proposed, wherein the computer-readable storage medium stores a computer program adapted to be loaded and executed by a processor, which is a frequency regulation auxiliary service scheduling method for a new energy power system proposed in the first aspect.

[0025] Fifthly, a computer program product is proposed, which includes a computer program. When the computer program is executed by a processor, it implements the frequency regulation auxiliary service scheduling method for a new energy power system proposed in the first aspect.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This invention proposes a method and system for dispatching frequency regulation ancillary services in a new energy power system. When determining the dispatching scheme for the new energy power system, the method comprehensively considers the system operating cost and the shortage of system frequency regulation ancillary services, so that the final dispatching scheme for the new energy power system can ensure the economic operation of the new energy power system and also ensure the stable operation of the new energy power system.

[0028] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0030] Figure 1 This is a flowchart of a frequency regulation auxiliary service scheduling method for a new energy power system proposed in an embodiment of the present invention;

[0031] Figure 2 This refers to the load forecast curve mentioned in the embodiments of the present invention;

[0032] Figure 3 The power curve of the new energy source mentioned in the embodiments of the present invention;

[0033] Figure 4 This refers to the actual load curve mentioned in the embodiments of the present invention;

[0034] Figure 5 This refers to the case of insufficient primary frequency regulation capacity in Example 1 mentioned in the embodiments of the present invention;

[0035] Figure 6 This refers to the case of insufficient secondary frequency modulation capacity in Example 1 mentioned in the embodiments of the present invention;

[0036] Figure 7 The amount of primary frequency regulation auxiliary service provided by new energy in Example 1 mentioned in the embodiments of the present invention;

[0037] Figure 8 The winning bid amount for the secondary frequency regulation auxiliary service provided by new energy in Example 1 mentioned in the embodiments of the present invention;

[0038] Figure 9 The output curve of G4 in Example 1 mentioned in the embodiments of the present invention;

[0039] Figure 10 The output curve of G4 in Example 2 mentioned in the embodiments of the present invention;

[0040] Figure 11 Provides a frequency modulation auxiliary service curve for G4 in Example 1 mentioned in the embodiments of the present invention;

[0041] Figure 12 Provides a frequency modulation auxiliary service curve for G4 in Example 2 mentioned in the embodiments of the present invention;

[0042] Figure 13 Provides a primary frequency modulation auxiliary service curve for G1 in example 3 mentioned in the embodiments of the present invention;

[0043] Figure 14 Provides a secondary frequency modulation auxiliary service curve for G1 in example 3 mentioned in the embodiments of the present invention;

[0044] Figure 15 Provides a primary frequency modulation auxiliary service curve for G2 in example 3 mentioned in the embodiments of the present invention;

[0045] Figure 16 This provides a secondary frequency modulation auxiliary service curve for G2 in example 3 mentioned in the embodiments of the present invention. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] The present invention proposes a frequency regulation auxiliary service scheduling method for a new energy power system, which is applied to the power system scheduling scenario when large-scale wind power, photovoltaic and other new energy sources are integrated into the power grid.

[0050] The integration of renewable energy into the power system alters its stochastic factors. Before large-scale renewable energy integration, system stochasticity was primarily caused by random outages of conventional generating units and power lines. Conventional generating units maintained system power balance by adjusting their output to track load fluctuations. The stochastic volatility and non-storability of wind and solar energy resources determine the stochastic volatility of wind and solar power generation. When large-scale renewable energy participates in power system balance, conventional generating units must further adjust their output to smooth out renewable energy output fluctuations to maintain system balance. When load and renewable energy output fluctuations exceed the system's adjustment range, renewable energy output needs to be restricted, leading to wind and solar curtailment. Furthermore, when the frequency regulation ancillary services provided by generators are significantly insufficient, it can easily cause power system collapse, resulting in system instability.

[0051] Due to the intermittent, highly volatile, and uncontrollable nature of wind and solar power, the integration of large-scale wind and solar power and other new energy sources into the power grid affects system stability. Therefore, it is essential to conduct research on frequency regulation ancillary services for high-proportion new energy power systems.

[0052] In order to ensure the economic and stable operation of the new energy power system, this application proposes a frequency regulation ancillary service dispatching method for the new energy power system. By aiming to minimize the system operating cost and the system frequency regulation ancillary service deficit, the final determined power system dispatching scheme can ensure the smooth and economical operation of the power system.

[0053] like Figures 1-16 As shown in the embodiment of the present invention, a frequency regulation auxiliary service scheduling method for a new energy power system includes:

[0054] Obtain information on the load, output, and frequency regulation service requirements of the new energy power system;

[0055] With the goal of minimizing system operating costs and system frequency regulation ancillary service deficit, the new energy power system dispatch scheme is calculated and determined based on the new energy power system load, new energy output, system frequency regulation service demand, and new energy power system dispatch model.

[0056] The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator.

[0057] In some embodiments, the new energy power system dispatch model includes power balance constraints, generator set operation constraints, constraints related to frequency regulation ancillary services provided by new energy power generators, and constraints related to system ancillary services.

[0058] The generator unit combination problem is a high-dimensional, discrete, non-convex, and nonlinear optimization problem. Building upon existing research, this paper establishes a new mathematical model for the generator unit combination problem and presents existing solution algorithms. The model uses the minimization of electricity purchase cost as the objective function, considering system constraints, generator unit constraints, and environmental and cybersecurity constraints arising from the new electricity market environment. System constraints include system active power balance constraints and system spinning reserve constraints, while generator unit constraints include maximum and minimum generator output constraints, minimum operating and downtime constraints, and generator ramp rate constraints.

[0059] The objective function of the basic unit combination problem can be expressed as:

[0060] (1)

[0061] In the formula, H This indicates the number of time periods within a research cycle. N Indicates the total number of generating units. This indicates that the unit's output power is Cost of time; This represents the start-up and shutdown costs of the generating unit, where, This indicates the cost of starting or stopping the generator unit. This indicates the start-up and shutdown status of the unit, with 0 representing the unit being shut down and 1 representing the unit being in operation.

[0062] The constraints of the unit combination problem include system constraints, unit constraints, and network security constraints. Among them, system constraints include system active power balance constraints and system spinning reserve constraints; unit constraints include generator maximum and minimum output constraints, unit minimum operating and downtime constraints, and unit ramp rate constraints; network security constraints include system reactive power balance and generator reactive power upper and lower limit constraints, and system voltage constraints.

[0063] The active power balance constraint of the system is:

[0064] (2)

[0065] In the formula: This represents the system load at time t. (The same applies below.)

[0066] The system spin-off reserve constraint is:

[0067] (3)

[0068] In the formula, This indicates the unit's maximum technical output. This indicates the system's spin-off backup requirement.

[0069] The maximum and minimum output constraints of the generator are:

[0070] (4)

[0071] In the formula: This indicates the minimum technical output of the generator unit. (The same applies below).

[0072] The minimum operating and downtime constraints for the unit are:

[0073] (5)

[0074] (6)

[0075] In the formula, This represents the total running time of unit i before time t-1. Indicates the minimum operating time of the unit. This represents the total downtime of the unit before time t-1. This indicates the minimum downtime of the generator unit. This indicates the start-up / shutdown status of unit i at time t-1.

[0076] The unit's ramp rate constraint is:

[0077] (7)

[0078] (8)

[0079] In the formula, , These represent the unit's uphill and downhill ramp rates, respectively.

[0080] The system reactive power balance and generator reactive power upper and lower limit constraints are as follows:

[0081] (10)

[0082] (11)

[0083] In the formula, This indicates that the generator unit outputs reactive power. Indicates the system's reactive power demand. , These represent the minimum and maximum reactive power output of the generator unit, respectively.

[0084] The system voltage constraint is:

[0085] (12)

[0086] In the formula, Indicates node voltage. , These represent the upper and lower limits of the node voltage, respectively.

[0087] Based on the basic unit combination model, this embodiment of the invention considers the system's frequency regulation ancillary service requirements, analyzes the impact of a high proportion of renewable energy integration on the system and its generators, and constructs a renewable energy power system dispatch model. When determining the renewable energy power system dispatch scheme based on the renewable energy power system load, renewable energy output, and system frequency regulation service requirements, the objective is to minimize the system operating cost and the system frequency regulation ancillary service deficit. The renewable energy power system dispatch model is solved to determine the final power system dispatch scheme. Because the system operating cost and the system frequency regulation ancillary service deficit are comprehensively considered when determining the renewable energy power system dispatch scheme, the final determined renewable energy power system dispatch scheme ensures both the economical operation and the stable operation of the renewable energy power system.

[0088] Among them, frequency regulation ancillary services are jointly optimized with electrical energy. The generators that provide frequency regulation ancillary services submit their adjustable frequency capacity and compensation quotations to the power grid dispatch in advance through user application.

[0089] In this embodiment of the invention, the frequency regulation ancillary services provided by the generator include primary frequency regulation ancillary services and secondary frequency regulation ancillary services. The system operating cost includes generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated and determined based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated and determined based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator. Specifically,

[0090] The objective is to minimize the system operating cost and the shortage of system frequency regulation ancillary services. The objective function expression is shown in equation (13):

[0091] (13)

[0092] In the formula, the first term represents the cost of power generation. The second through fifth terms represent the cost of providing frequency regulation ancillary services to the power generator. This indicates the cost of providing one up-frequency regulation ancillary service by the generator. This indicates the capacity of the primary frequency regulation auxiliary service provided by the generator. These represent the cost and capacity of the generator providing one down-regulation ancillary service, respectively. These represent the cost and capacity of the secondary up-regulation ancillary services provided by the generator, respectively. These represent the cost and capacity of the secondary down-regulation ancillary services provided by the generator, respectively. , These represent the system's deficit in frequency modulation ancillary services and the deficit in frequency modulation ancillary services, respectively. , ; , These represent the system's secondary up-frequency modulation ancillary service deficit and down-frequency modulation ancillary service deficit, respectively. , . , These represent the weighting ratios between the cost of a single up-frequency regulation ancillary service provided by the generator and the system's single up-frequency regulation ancillary service deficit, respectively. , These represent the weighting ratios between the cost of secondary up-regulation ancillary services provided by the generator and the system's secondary up-regulation ancillary service deficit, respectively.

[0093] The power balance constraints in the new energy power system dispatch model constructed in this embodiment of the invention are as follows:

[0094] (14)

[0095] In the formula: L represents the output of generator n at time t; t For the load of the new energy power system; W t Contributing to new energy sources can be predicted.

[0096] The generator set operation constraints in the new energy power system dispatch model constructed in this embodiment of the invention include generator set output constraints, ramping constraints, minimum start-stop time constraints, and start-stop cost constraints.

[0097] The generator set output constraint is:

[0098] (15)

[0099] In the formula, The variable is a 0-1 decision variable representing the unit startup status, where 1 represents the unit operating. , This refers to the maximum / minimum output limit of the unit.

[0100] The climbing constraint is:

[0101] (16)

[0102] In the formula, This represents the output of generator n at time t-1; , These refer to the generator's hourly uphill and downhill climbing capabilities, respectively.

[0103] The minimum start-stop time constraint is:

[0104] (17)

[0105] In the formula, D n and O n These represent the minimum downtime and minimum start-up time for unit n, respectively.

[0106] The start-stop cost constraint is:

[0107] (18)

[0108] In the formula, G n Let n be the start-up and shutdown cost of unit n.

[0109] The constraints related to the frequency regulation ancillary services provided by renewable energy generators in the renewable energy power system dispatch model constructed in this embodiment of the invention include the capacity constraints of the primary frequency regulation services provided by renewable energy generators, renewable energy output constraints, the capacity constraints of the secondary frequency regulation services provided by renewable energy generators, and the power generation capacity constraints when renewable energy generators provide frequency regulation services.

[0110] The capacity constraint for the first frequency regulation service provided by the renewable energy power generator is as follows:

[0111] (19)

[0112] In the formula, This indicates the capacity of the frequency regulation service provided by the new energy power generator; This indicates the maximum frequency offset allowed by the system; Indicates the dead zone of a single frequency modulation (FM). This represents the equivalent droop constant for new energy power generators.

[0113] The power output constraints for new energy sources are:

[0114] (20)

[0115] In the formula, This represents the actual output of the new energy source at time t; This indicates the minimum output level of a new energy power generator; This represents the maximum technical output of the new energy power generator at time t.

[0116] The capacity constraint for secondary frequency regulation services provided by renewable energy power generators is:

[0117] (twenty one)

[0118] (twenty two)

[0119] In the formula, This indicates the capacity of secondary frequency regulation services provided by new energy power generators; This indicates the capacity of secondary frequency regulation services provided by new energy power generators; Indicates the minimum time required for the system to return to its rated frequency; This indicates the ramp-up rate of new energy power generators.

[0120] The generation capacity constraint for renewable energy power generators providing frequency regulation services is as follows:

[0121] (twenty three)

[0122] (twenty four)

[0123] Formulas (23) and (24) respectively indicate that both primary and secondary frequency regulation provided by new energy power generators should comply with the limitations of power generation capacity.

[0124] The system auxiliary service related constraints in the new energy power system dispatch model constructed in this embodiment of the invention include the frequency regulation auxiliary service capacity constraints that the system needs to reserve when the system needs frequency regulation auxiliary services after the new energy is added to the system, specifically including equations (25), (26) and (27).

[0125] (25)

[0126] In the formula, This represents the total load of the system at time t; Indicates the system's rated frequency; This indicates a single frequency adjustment service requirement from the system.

[0127] (26)

[0128] In the formula, This indicates the system's need for secondary frequency modulation services.

[0129] (27)

[0130] In the formula, This indicates the system's need for secondary down-frequency modulation services.

[0131] In this embodiment of the invention, the acquired load, output, and frequency regulation service demand of the new energy power system are substituted into the new energy power system dispatch model. The model is then solved using Python and CPLEX to obtain a power system dispatch scheme that includes generator start-stop status, generator output, generator-provided primary and secondary up and down frequency regulation auxiliary service capacity, and primary and secondary up and down frequency regulation service capacity provided by new energy power generators.

[0132] In this embodiment of the invention, after determining the power system dispatch scheme, in order to accurately determine the compensation cost of the generators providing frequency regulation ancillary services in the new energy power system, the total cost of frequency regulation ancillary services for the remaining generators that can provide frequency regulation ancillary services after deducting the frequency regulation ancillary service cost of the generators providing frequency regulation ancillary services from the total cost of frequency regulation ancillary services for all generators that can provide frequency regulation ancillary services in the system, and the remaining total cost of frequency regulation ancillary services after deducting the frequency regulation ancillary service cost of the generators providing frequency regulation ancillary services from the total cost of frequency regulation ancillary services for all generators that can provide frequency regulation ancillary services in the system.

[0133] Calculate the difference between the two total costs as compensation for the generators providing frequency regulation ancillary services. .

[0134] Based on the VCG mechanism, this embodiment of the invention determines the compensation cost for the generator providing frequency regulation ancillary services. The calculation formula is:

[0135] (28)

[0136] in, This represents the total cost of frequency regulation ancillary services for all generators that can provide frequency regulation ancillary services, excluding generator n which provides such services. ; The set of generators that can provide frequency regulation auxiliary services, excluding generator n that provides frequency regulation auxiliary services, is represented by a vector. This represents the total cost of frequency regulation ancillary services for all generators in the system capable of providing such services. Therefore... This represents the total cost of frequency regulation ancillary services remaining after deducting the cost of frequency regulation ancillary services for generator n from the total cost of frequency regulation ancillary services provided by all generators in the system capable of providing such services.

[0137] Based on a 10-unit renewable energy power system, this invention describes a frequency regulation ancillary service dispatching method for a renewable energy power system. In this 10-unit renewable energy power system, 5 generators can provide frequency regulation ancillary services. Using 24-hour load data from a certain location as the initial load, the photovoltaic installed capacity is 400MW. The initial system load is as follows: Figure 2 As shown, the current forecast power of new energy sources is as follows: Figure 3 As shown.

[0138] The effectiveness of the new energy power system dispatch model proposed in this embodiment of the invention is illustrated by comparing three calculation examples.

[0139] The three examples are illustrated in Table 1.

[0140] Table 1: Example Explanation

[0141] name Pattern definition Calculation example 1 In the basic example, the price for ancillary services provided by the generator is 0. Calculation example 2 With the removal of renewable energy sources, the price for ancillary services provided by generators is 0. Calculation example 3 Generator ancillary services are provided for a fee.

[0142] Table 2 shows the prices of ancillary services provided by each generator in Example 3. In Table 2, Cost is the cost item, Generation is the generation cost, PFR is the primary frequency regulation cost, AGC UP is the secondary up-frequency regulation cost, and AGC DOWN is the secondary down-frequency regulation cost.

[0143] Table 2: Generator Marginal Cost and Ancillary Service Price in Example 3

[0144] Cost ($ / MW) Generation PFR AGC UP AGC DOWN G1 18.144 10 12 12 G2 19.793 11 12 12 G3 1 19 20 20 G4 2 18 19 19 RE 0 0.001 0.001 0.001

[0145] Table 3 shows the payment costs for generators under different frequency regulation ancillary service payment mechanisms in Example 3.

[0146] Table 3: Comparison of Compensation Costs between Joint Optimized Centralized Clearing and VCG Mechanism

[0147] Clearing mechanism Centralized Clearing VCG mechanism Incentive Price (¥ / MWh) 16.84 14.35 Payment (¥) 360.4 361.6

[0148] Combination Figures 4-6 It can be seen that there was no shortage of primary and secondary frequency regulation capacity, which indicates that the five generators in the system can well meet the system's requirements for primary and secondary frequency regulation.

[0149] Figures 7-8 This is a clearing map for new energy participation in the electricity and ancillary services market. From Figure 7 As can be seen, renewable energy generators do not provide primary frequency regulation ancillary services. This is because the cost of renewable energy generation is generally considered to be zero, therefore renewable energy generators operate at full capacity, leaving insufficient capacity for primary frequency regulation services. For secondary frequency regulation services, combined with... Figure 8It can be seen that renewable energy can provide secondary frequency regulation downsampling services, but cannot provide secondary frequency regulation upsampling services. First, for dispatchers, the output of renewable energy generators can be effectively reduced through control components or control strategies, so renewable energy can provide secondary frequency regulation downsampling services; however, the output limit of renewable energy generators is limited by natural factors such as wind and solar power, so in example 1, renewable energy cannot provide secondary frequency regulation upsampling services.

[0150] Figure 9 and Figure 10 The output of conventional thermal power (G4) in Example 1 and Example 2 are shown respectively. By comparing the output curves of new energy sources in Example 1, it can be seen that when new energy sources start to output power, the output of G4 generators decreases significantly. This reflects the squeeze on conventional thermal power by new energy generators with zero marginal cost. In Example 2, after removing the new energy sources, G4 is always at full capacity.

[0151] In providing ancillary services, combined with Figure 9 and Figure 10 In Example 1, because the output of generator G4 is "taken over" by new energy sources, G4 can only win a small number of bids in the secondary frequency regulation ancillary service market. Only when the new energy generator stops generating power, i.e. after 5 PM, can G4 win a larger number of bids in the secondary frequency regulation ancillary service market. In Example 2, after the new energy generator is removed, G4 is always at full capacity. Therefore, G4 can win a larger number of bids in the secondary frequency regulation ancillary service market.

[0152] In both Case 1 and Case 2, the price for generators to provide auxiliary services is set to 0. However, in actual applications, generators will charge a certain fee for providing auxiliary services. By comparing the bidding results of generator No. 4 in the power market and auxiliary service market in Case 1 and Case 2, it can be seen that the grid connection of new energy sources will affect the income of other conventional units in actual applications.

[0153] Figures 11-12 The results show the bidding status of G1 in primary frequency modulation auxiliary services and secondary frequency modulation auxiliary services, respectively. Figure 13-14 The bidding results for G2 in primary frequency modulation auxiliary services and secondary frequency modulation auxiliary services are indicated separately. Figure 15-16 The bidding results for primary frequency regulation ancillary services and secondary frequency regulation ancillary services by new energy power generators are indicated separately.

[0154] As shown in the graph, because the ancillary services offered by generators 1 and 2 are relatively inexpensive, system operators tend to favor these two generators when adjusting the system frequency. Furthermore, since generator 2 offers primary frequency regulation services at a price of 0, its primary frequency regulation capacity remains at its maximum. The graph also shows that because renewable energy sources offer the highest ancillary services, although they are constantly running and have sufficient capacity, they have not won bids in the frequency regulation ancillary service market.

[0155] The present invention proposes a method for scheduling frequency regulation ancillary services in a new energy power system. When determining the scheduling scheme for the new energy power system, it comprehensively considers the system operating cost and the shortage of system frequency regulation ancillary services, so that the final determined scheduling scheme for the new energy power system can ensure the economic operation of the new energy power system and also ensure the stable operation of the new energy power system.

[0156] This invention also proposes a frequency regulation auxiliary service dispatching system for a new energy power system, comprising:

[0157] The data acquisition unit is used to acquire the load, power output, and frequency regulation service requirements of the new energy power system.

[0158] The dispatch scheme determination unit is used to calculate and determine the dispatch scheme of the new energy power system with the goal of minimizing the system operating cost and the system frequency regulation ancillary service deficit, based on the load of the new energy power system, the output of new energy, the system frequency regulation service demand and the dispatch model of the new energy power system.

[0159] The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator.

[0160] It should be noted that the frequency regulation auxiliary service dispatching system for a new energy power system provided in the above embodiments is only illustrated by the division of the above functional modules when performing dispatching and control of the new energy power system. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the equipment can be divided into different functional modules to complete all or part of the functions described above. In addition, the frequency regulation auxiliary service dispatching system for a new energy power system and the frequency regulation auxiliary service dispatching method embodiment for a new energy power system belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0161] The present invention also discloses a computer device, the device comprising:

[0162] A processor, adapted to execute computer programs;

[0163] A computer-readable storage medium storing a computer program, which, when executed by the processor, implements a frequency regulation auxiliary service scheduling method for a new energy power system proposed in this embodiment of the invention.

[0164] The present invention also discloses a computer-readable storage medium storing a computer program adapted for loading and execution by a processor of a frequency regulation auxiliary service scheduling method for a new energy power system proposed in the embodiments of the present invention.

[0165] The present invention also discloses a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements a frequency regulation auxiliary service scheduling method for a new energy power system proposed in the embodiments of the present invention.

[0166] The method proposed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are omitted here.

[0167] Those skilled in the art will recognize that the units and algorithm steps described in conjunction with the embodiments herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0168] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A frequency regulation auxiliary service dispatching method for a new energy power system, characterized in that, include: Obtain information on the load, output, and frequency regulation service requirements of the new energy power system; With the goal of minimizing system operating costs and the shortage of system frequency regulation ancillary services, the objective function is: In the formula, the first term is the cost of power generation; the second to fifth terms are the costs of providing frequency regulation ancillary services to the power generator. This indicates the cost of providing one up-frequency regulation ancillary service by the generator. This indicates the capacity of the primary frequency regulation auxiliary service provided by the generator. These represent the cost and capacity of the generator providing one down-regulation ancillary service, respectively. These represent the cost and capacity of the secondary up-regulation ancillary services provided by the generator, respectively. These represent the cost and capacity of the secondary down-regulation ancillary services provided by the generator, respectively. , These represent the system's deficit in frequency modulation ancillary services and the deficit in frequency modulation ancillary services, respectively. , ; , These represent the system's secondary up-frequency modulation auxiliary service deficit and down-frequency modulation auxiliary service deficit, respectively. , These represent the weighting ratios between the cost of a single up-frequency regulation ancillary service provided by the generator and the system's single up-frequency regulation ancillary service deficit, respectively. , These represent the weighting ratios between the cost of secondary up-frequency regulation ancillary services provided by the generator and the system's secondary up-frequency regulation ancillary service deficit, respectively; and between the cost of secondary down-frequency regulation ancillary services provided by the generator and the system's secondary down-frequency regulation ancillary service deficit, respectively. Based on the load, output, frequency regulation service demand, and dispatch model of the new energy power system, the dispatch scheme of the new energy power system is calculated and determined. The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator. Based on the scheduling scheme, the total cost of frequency modulation ancillary services for the generators that can provide frequency modulation ancillary services, excluding the generators that provide frequency modulation ancillary services, is determined, as well as the total cost of frequency modulation ancillary services remaining after deducting the frequency modulation ancillary service cost of the generators that provide frequency modulation ancillary services from the total cost of frequency modulation ancillary services for all generators that can provide frequency modulation ancillary services in the system. Calculate the difference between the two total costs as compensation for the generators providing frequency regulation ancillary services; Based on the VCG mechanism, determine the compensation cost for generators providing frequency regulation ancillary services. The calculation formula is: in, This represents the total cost of frequency modulation ancillary services for the system, excluding generator n which provides frequency modulation ancillary services, and the remaining generators that can provide frequency modulation ancillary services. The set of generators that can provide frequency regulation auxiliary services, excluding generator n that provides frequency regulation auxiliary services, is represented by a vector. The total cost of frequency regulation ancillary services for all generators in the system capable of providing such services. This represents the total cost of frequency regulation ancillary services remaining after deducting the cost of frequency regulation ancillary services for generator n from the total cost of frequency regulation ancillary services provided by all generators in the system capable of providing such services.

2. The frequency regulation auxiliary service dispatching method for a new energy power system as described in claim 1, characterized in that, The dispatch model for new energy power systems includes power balance constraints, generator unit operation constraints, constraints related to frequency regulation ancillary services provided by new energy power generators, and constraints related to system ancillary services.

3. The frequency regulation auxiliary service dispatching method for a new energy power system as described in claim 2, characterized in that, Generator set operation constraints include generator set output constraints, ramping constraints, minimum start-stop time constraints, and start-stop cost constraints.

4. The frequency regulation auxiliary service dispatching method for a new energy power system as described in claim 2, characterized in that, The constraints related to the frequency regulation ancillary services provided by renewable energy power generators include the capacity constraints of primary frequency regulation services provided by renewable energy power generators, renewable energy output constraints, the capacity constraints of secondary frequency regulation services provided by renewable energy power generators, and the power generation capacity constraints when renewable energy power generators provide frequency regulation services.

5. A frequency regulation auxiliary service dispatching system for a new energy power system, employing the frequency regulation auxiliary service dispatching method for a new energy power system as described in any one of claims 1-4, characterized in that, include: The data acquisition unit is used to acquire the load, power output, and frequency regulation service requirements of the new energy power system. The dispatch scheme determination unit is used to calculate and determine the dispatch scheme of the new energy power system with the goal of minimizing the system operating cost and the system frequency regulation ancillary service deficit, based on the load of the new energy power system, the output of new energy, the system frequency regulation service demand and the dispatch model of the new energy power system. The system operating cost includes power generation cost and frequency regulation ancillary service cost. The frequency regulation ancillary service cost is calculated based on the frequency regulation ancillary service capacity provided by the generator. The system frequency regulation ancillary service deficit is calculated based on the system frequency regulation service demand and the frequency regulation ancillary service capacity provided by the generator.

6. An electronic device, characterized in that, The device includes: A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program, which, when executed by the processor, implements the frequency regulation auxiliary service scheduling method for a new energy power system as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed by the processor to provide a frequency regulation auxiliary service scheduling method for a new energy power system according to any one of claims 1-4.

8. A computer program product, characterized in that, The computer program product includes a computer program, which, when executed by a processor, implements the frequency regulation auxiliary service scheduling method for a new energy power system as described in any one of claims 1-4.

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