New power system energy storage capacity demand calculation method applied to power supply guarantee

Abstract

The application discloses a novel power system energy storage capacity demand calculation method applied to power supply guarantee, relates to the technical field of power systems, and comprises the following steps: according to surplus power and power shortage of each time period set of the novel power system before energy storage plays a role, maximum and minimum values of energy storage capacity demand are calculated and acquired; the calculation initial value of actual energy storage capacity demand is set as the minimum value, the power "transportation" process of energy storage is simulated by substituting the actual energy storage capacity, and the residual power shortage of the system is calculated; when the critical energy storage capacity, at which the residual power shortage of the system obtained through the iterative calculation mode of increasing the actual energy storage capacity calculation value is less than zero, is obtained, the critical energy storage capacity is the actual energy storage capacity demand of the novel power system. The application realizes accurate calculation of the energy storage capacity demand of energy storage matched with new energy in a high-proportion new energy power system, and the energy storage and new energy jointly play the role of multi-day power supply guarantee, thereby providing a new technical inspiration for reasonable planning and layout of energy storage power.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a new power system energy storage capacity demand calculation method applied to power supply guarantee. BACKGROUND

[0002] In the new power system, the proportion of wind power and photovoltaic power is large, and the meteorological sensitivity in supply and demand balance is large. When continuous multi-day no wind, few sunshine and other weather occurs, the continuous multi-day low output of wind power and photovoltaic power will make the system face the situation of multi-day power supply shortage, and energy storage power becomes an important means to guarantee the continuous and stable supply of power in combination with new energy. Therefore, whether the continuous discharge capacity of energy storage is sufficient is a key factor affecting power supply guarantee, and effective evaluation of the energy storage capacity demand of the system from the overall perspective of the new power system is the key to reasonable planning of energy storage. At present, the research on energy storage capacity demand evaluation and capacity optimization method mainly aims at peak regulation of local power system and power fluctuation suppression of new energy station, and the research object is new energy station, local power system or microgrid, and there is a lack of research on energy storage capacity demand for power supply guarantee from the overall perspective of the large power grid system. SUMMARY

[0003] In order to solve the above problems, the purpose of the present application is to provide a new power system energy storage capacity demand calculation technology applied to power supply guarantee mode, which aims to accurately calculate the energy storage capacity demand of energy storage in combination with new energy for multi-day power supply guarantee in a high-proportion new energy power system, and is helpful to realize reasonable planning and layout of energy storage power in the new power system.

[0004] In order to achieve the above technical purpose, the present application provides a new power system energy storage capacity demand calculation method applied to power supply guarantee, comprising the following steps:

[0005] According to the surplus power and the power shortage of each time period set of the new power system before the energy storage plays a role, the maximum value and the minimum value of the energy storage capacity demand are calculated and obtained;

[0006] The calculation initial value of the actual energy storage capacity demand is set as the minimum value, the energy storage power "transportation" process is simulated by substituting the actual energy storage capacity, and the remaining power shortage of the system is calculated;

[0007] According to the remaining power shortage of the system, the energy storage capacity demand of the new power system is obtained by increasing the iterative calculation value of the actual energy storage capacity.

[0008] Preferably, in the process of obtaining the surplus power and the power shortage, the surplus power and the power shortage of each time period set of the system are obtained in combination with the power supply installed capacity, the typical scene of new energy and the power demand prediction.

[0009] Preferably, in the process of obtaining the surplus power and the deficiency power of each time period set of the system, the surplus power and the deficiency power The specific calculation expression is as follows:

[0010]

[0011] Wherein:

[0012]

[0013] In the formula, is the system deficiency power in the qth time period set; P t Demand is the system power demand at t moment without considering the loss of load power; P t Max is the maximum power generation capacity of all power sources of the system at t moment without considering the new energy curtailment; T q is the qth continuous time period set in which the energy storage needs to continuously generate power to ensure supply in the total calculation duration; X t is the system power surplus symbol when the energy storage does not work, wherein X t the value of 0 indicates that there is surplus power in the system, which can be used for charging the energy storage, X t the value of 1 indicates that the power generation capacity of the system is insufficient, and the energy storage needs to generate power to ensure supply; is the system surplus power in the qth time period set; T' q is the qth continuous time period set in which there is surplus power in the system in the total calculation duration; P t Com,Max is the maximum power generation capacity of the conventional power source in the system; P t Wind , P t PV are the wind power and photovoltaic power in the system at t moment under the typical scenario of new energy respectively; P t In is the received power of the system at t moment; P t Load is the power load demand of the system at t moment; P t R is the standby capacity of the system at t moment; P t Out is the outgoing power of the system at t moment.

[0014] Preferably, in the process of calculating the maximum and minimum of the energy storage capacity demand, two extreme cases are mainly divided, i.e. the surplus power is sufficient and the surplus power is zero. When the surplus power is sufficient, the energy storage can complete each power "transportation" process, and the energy storage capacity demand is the maximum power required for the energy storage to continuously discharge during the load peak period, which is the minimum of the energy storage capacity demand;

[0015] When the surplus power is zero, the energy storage capacity demand is the sum of the power required for the energy storage to continuously discharge during all load peak periods, which is the maximum of the energy storage capacity demand.

[0016] Preferably, in the process of obtaining the maximum and minimum of the energy storage capacity demand, the minimum and maximum of the energy storage capacity demand are respectively represented as:

[0017]

[0018] In the formula, respectively, the minimum and maximum of the energy storage capacity demand of the system; η C is the charging efficiency of the energy storage.

[0019] Preferably, in the process of calculating the remaining power shortage of the system, the actual demand of the energy storage capacity of the system is calculated by increasing the iterative calculation of the actual capacity calculation value of the energy storage, and the initial energy storage calculation capacity is the minimum of the energy storage capacity demand.

[0020] Preferably, in the process of obtaining the energy storage capacity demand of the new power system, it is judged whether the obtained remaining power shortage of the system is greater than zero. If the remaining power shortage of the system is greater than zero, the actual capacity of the energy storage is increased by the energy storage growth capacity step based on the existing energy storage capacity demand calculation value. If the remaining power shortage of the system is not greater than zero for the first time, the calculation value of the energy storage capacity is the actual demand of the energy storage capacity of the system, and the actual capacity of the energy storage is output.

[0021] Preferably, in the process of obtaining the remaining power shortage of the system, the remaining power shortage E VAN of the system is represented as:

[0022]

[0023] In the formula, E q is the remaining power in the energy storage after the energy storage completes the qth power "transportation" process; is the idle capacity of the energy storage; η D is the discharging efficiency of the energy storage, E Storage is the actual demand of the energy storage capacity.

[0024] The application also discloses a new power system energy storage capacity demand calculation system for implementing the new power system energy storage capacity demand calculation method applied to power supply guarantee, which comprises the following modules:

[0025] The energy storage capacity demand extreme value calculation module is used for calculating the maximum value and the minimum value of the energy storage capacity demand according to the surplus power and the power shortage of each time period set of the new power system before the energy storage plays a role.

[0026] The system power shortage calculation module is used for setting the calculation initial value of the actual energy storage capacity demand as the minimum value of the energy storage capacity demand, simulating the power "transportation" process of the energy storage by substituting the actual energy storage capacity, and calculating the remaining power shortage of the system.

[0027] The energy storage capacity demand iterative calculation module is used for obtaining the actual energy storage capacity demand of the new power system by increasing the iterative calculation value of the actual energy storage capacity according to the remaining power shortage of the system.

[0028] The application discloses the following technical effects:

[0029] The application realizes the calculation of the actual energy storage capacity demand of the system applied to the power supply guarantee mode from the global perspective of the new power system. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The figure is a method flowchart of the application. DETAILED DESCRIPTION

[0032] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] AsFigure 1 As shown, this invention provides a novel power system energy storage capacity demand calculation technology applied to power supply guarantee modes. First, it distinguishes energy storage power sources from other types of power sources. Energy storage itself cannot generate electricity; it serves as a "transfer" medium between surplus and deficit electricity within the system. Therefore, whether energy storage can fully play its role in power supply guarantee is mainly affected by three factors: the surplus electricity available for storage within the system, the capacity of the energy storage itself, and the deficit electricity that the system needs to continuously generate to guarantee power supply. Second, by setting the surplus electricity within the system to infinity and zero, it proposes a method for calculating the minimum and maximum values ​​of the system's energy storage capacity demand. Finally, it proposes an upward iterative optimization approach for calculating the actual demand for system energy storage capacity. By simulating the electricity "transfer" process of energy storage during multiple days of power supply guarantee, the energy storage capacity value obtained when the system's surplus electricity deficit is not zero for the first time is the actual demand for system energy storage capacity.

[0034] Specifically, the demand calculation method proposed in this invention includes the following steps:

[0035] Step S1: Based on the system's installed power capacity, typical new energy scenarios, and electricity demand forecasts, calculate the surplus electricity collected in the system at various time periods before energy storage comes into play. and missing power

[0036] Step S2: Calculate the maximum energy storage capacity requirement. and minimum value

[0037] Step S3: Set the initial value for calculating the actual energy storage capacity demand to the minimum value.

[0038] Step S4: Substitute in the actual energy storage capacity E Storage The simulation of the energy "transfer" process in energy storage is used to calculate the remaining energy deficit E of the system. VAN .

[0039] Step S5: Determine the calculated system remaining power deficit E VAN Is it greater than zero?

[0040] Step S6: If E VAN If the value is greater than zero, the actual energy storage capacity needs to be increased, and the step size for increasing the energy storage capacity is ΔE. Storage .

[0041] Step S7: If E VAN If E is not greater than zero, then Storage This refers to the system's energy storage capacity requirement, which is E Storage Output.

[0042] The surplus power of each time period set of the system before the energy storage has not yet played a role in step S1 And the shortage power The specific expression is as follows:

[0043]

[0044] Wherein:

[0045]

[0046] In the formula, The system shortage power in the qth time period set; P t Demand The system power demand at t time without considering the loss of load power; P t Max The maximum power generation capacity of all power sources (except energy storage) of the system at t time without considering new energy power abandonment; T q The qth continuous time period set in which the energy storage needs to continuously generate power to maintain supply within the total duration; X t The system power surplus symbol when the energy storage is not in action, wherein X t The value of 0 indicates that the system has surplus power and can charge the energy storage, X t The value of 1 indicates that the system has insufficient power generation capacity and needs the energy storage to generate power to maintain supply; The system surplus power in the qth time period set; T q The qth continuous time period set in which the system has surplus power within the total duration; P t Com,Max The maximum power generation capacity of the conventional power source in the system; P t Wind , P t PV The wind power and photovoltaic power in the system at t time under the typical scenario of new energy; P t In The received power of the system at t time; P t Load The power load demand of the system at t time; P t R The standby capacity of the system at t time; P t Out The outward power of the system at t time.

[0047] In step S2, the maximum and minimum values of the energy storage capacity demand are calculated, and the specific calculation idea is as follows: surplus power Shortage power And the energy storage capacity demand E StorageThere is a certain numerical relationship between the three, and they are mutually restricted. The system energy storage capacity demand is closely related to the other two. Considering the two extreme cases of sufficient surplus power and zero surplus power, the maximum and minimum values of the energy storage capacity demand can be obtained. When the surplus power is sufficient, the energy storage can complete the power "transportation" process each time, and the energy storage capacity demand is the maximum power required for continuous discharge of the energy storage during the load peak period, which is the minimum value of the energy storage capacity demand. When the system surplus power is zero, the energy storage capacity demand is the sum of the power required for continuous discharge of the energy storage during the load peak period, which is the maximum value of the energy storage capacity demand. The specific expression is as follows:

[0048]

[0049] In the formula, are the minimum and maximum values of the system energy storage capacity demand respectively; η C is the charging efficiency of the energy storage.

[0050] In step S3, the calculated initial value of the actual energy storage capacity demand is the minimum value, and the specific calculation idea is as follows: the energy storage serves as a "transportation" medium for the system surplus power and the power shortage, and the size of the energy storage capacity affects the power "transportation" effect. The size of the system surplus power also restricts the power "transportation" effect of the energy storage, so it is necessary to determine the actual demand of the system energy storage capacity by increasing the iterative calculation of the actual energy storage capacity calculation value. The initial energy storage calculation capacity is the minimum value of the energy storage capacity demand.

[0051] In step S4, the actual energy storage capacity demand E Storage is substituted into the actual energy storage capacity demand E VAN , and the power "transportation" process of the energy storage is simulated to calculate the system's remaining power shortage E q , and the specific expression is as follows:

[0052]

[0053] In the formula, E q is the remaining power in the energy storage after the energy storage completes the qth power "transportation" process; is the idle capacity of the energy storage; η D is the discharge efficiency of the energy storage.

[0054] In step S5, it is judged whether the calculated system remaining power shortage E VAN is greater than zero, and the main purpose is to judge whether the current substituted energy storage capacity can meet the system power supply demand. E VAN greater than zero indicates that there is still a power shortage after the energy storage fully plays the role of power "transportation", and the energy storage capacity is insufficient; E VAN less than zero indicates that there is no power shortage in the system after the energy storage fully plays the role of power "transportation", and the energy storage capacity meets the demand.

[0055] In step S6, if E VAN is greater than zero, the calculated value of the energy storage capacity demand needs to be increased, and the energy storage capacity growth step is ΔE Storage , and the specific expression is as follows:

[0056] E Storage = E Storage + ΔE Storage

[0057] In the formula, ΔE Storage is the energy storage capacity growth step, which is generally determined based on the maximum and minimum demand values of the energy storage according to the actual situation, and the value of ΔE Storage determines the optimization accuracy and calculation efficiency.

[0058] In step S7, if E VAN is not greater than zero, E Storage is the energy storage capacity demand of the system, in order to ensure that the calculated value of the energy storage capacity demand is as small as possible, the output E Storage needs to be the value when E VAN is first not greater than zero, and it needs to satisfy

[0059] The present application takes upward iterative optimization as the main calculation idea of the actual demand of the system energy storage capacity, clearly defines that the energy storage is the "transportation" medium between the surplus power and the power shortage in the system, determines that the three factors influencing the effective play of the energy storage in the system power supply are the surplus power available for energy storage in the system, the capacity of the energy storage itself, and the power shortage that needs to be continuously supplied by the energy storage, sets the surplus power in the system to be infinite and zero, calculates the minimum value and the maximum value of the energy storage capacity demand of the system, and repeatedly iterates the energy storage capacity calculation value when the first time the remaining power shortage is not zero, that is, the actual demand of the energy storage capacity of the system. The present application realizes accurate calculation of the energy storage capacity demand of the energy storage in the high-proportion new energy power system, which helps to realize reasonable planning and layout of the energy storage type power source in the new type power system.

[0060] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions of the flowchart block(s) or step(s) of the flowchart block(s). Figure 1 one or more of the flowchart or block diagrams. Figure 1 one or more of the flowchart or block diagrams.

[0061] In the description of the present application, it is to be understood that the terms "first", "second", "third" and the like, merely identify features belonging to distinct categories, and do not imply or imply a relative importance or a specific number thereof. Thus, a feature identified as "first", "second", or "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise expressly and specifically limited.

[0062] Obviously, various modifications and changes are possible in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application embrace all such modifications and changes that fall within the scope of the claims and their equivalents.

Claims

1. A novel power system energy storage capacity demand calculation method applied to power supply security, characterized in that, Includes the following steps: Based on the surplus and deficit electricity of the new power system at various time periods before energy storage comes into play, the maximum and minimum values ​​of energy storage capacity demand are calculated. The initial value for calculating the actual energy storage capacity demand is set to a minimum value. By substituting the actual energy storage capacity, the process of "transferring" the energy stored is simulated, and the remaining energy deficit of the system is calculated. By using an iterative calculation method that increases the actual energy storage capacity, the critical energy storage capacity obtained when the system's remaining power deficit is less than zero is the actual energy storage capacity requirement of the new power system. In the process of acquiring the surplus and deficit electricity amounts for each time period in the system, the surplus electricity... and missing power The specific expression is as follows: ； in: ; ； In the formula, P represents the system deficit electricity within the q-th time period set; t Demand P represents the system power demand at time t without considering the power loss due to load. t Max Let T be the maximum generating capacity of the entire system without considering the curtailment of renewable energy at time t; q Let X be the set of continuous time periods within the total duration where energy storage is required for continuous power generation to ensure supply; t This is an indicator of system power surplus when energy storage is not utilized, where X t A value of 0 indicates that the system has surplus electricity available for energy storage and charging. t A value of 1 indicates that the system's power generation capacity is insufficient and energy storage is needed to ensure power supply. T represents the system surplus electricity within the q-th time period set; q ' To calculate the set of consecutive time periods within the q-th system that have surplus electricity within the total duration; P t Com,Max P represents the maximum generating capacity of the conventional power source within the system. t Wind P t PV These represent the power output of wind power and photovoltaic power within the system at time t in typical new energy scenarios; P t In P represents the input power of the system at time t. t Load Let P be the system's power load demand at time t; t R P represents the system's reserve capacity at time t. t Out Let t be the power transmitted by the system at time t; In the process of obtaining the maximum and minimum values ​​of energy storage capacity demand, it is mainly divided into two extreme cases: sufficient surplus power in the system and zero surplus power. When the surplus power is sufficient, it is assumed that the energy storage can complete each power "transfer" process. The energy storage capacity demand is the maximum amount of power that the energy storage needs to continuously discharge during peak load periods. This is the minimum value of energy storage capacity demand. When the surplus electricity is zero, the energy storage capacity demand is the sum of the electricity required for continuous discharge of energy storage during all peak load periods, which is the maximum value of the energy storage capacity demand. In the process of calculating the maximum and minimum values ​​of energy storage capacity demand, the minimum and maximum capacity demands of energy storage are expressed as follows: ； In the formula, η represents the minimum and maximum values ​​of the system's energy storage capacity requirement, respectively. C To improve energy storage charging efficiency.

2. The method for calculating the energy storage capacity demand of a novel power system applied to power supply security according to claim 1, characterized in that: In the process of obtaining surplus and deficit electricity, the system's power generation capacity, typical new energy scenarios, and electricity demand forecasts are combined to obtain the surplus and deficit electricity for each time period.

3. The method for calculating the energy storage capacity demand of a novel power system applied to power supply security according to claim 1, characterized in that: In the process of calculating the remaining power deficit of the system, the actual demand for energy storage capacity is determined by iterative calculation of the actual energy storage capacity. The initial calculated energy storage capacity is the minimum value of the energy storage capacity demand.

4. The method for calculating the energy storage capacity demand of a novel power system applied to power supply security according to claim 3, characterized in that: In the process of obtaining the energy storage capacity demand of the new power system, it is necessary to determine whether the calculated system remaining power deficit is greater than zero. If the system remaining power deficit is greater than zero, the actual energy storage capacity needs to be increased according to the energy storage growth capacity step size based on the existing calculated energy storage capacity demand value. If the system's remaining power deficit is not greater than zero for the first time, then the calculated value of the energy storage capacity is the actual energy storage capacity requirement of the system, and the actual energy storage capacity will be output.

5. The method for calculating the energy storage capacity demand of a novel power system applied to power supply security according to claim 4, characterized in that: In the process of obtaining the system's remaining power deficit, the system's remaining power deficit EVAN is represented as: ； In the formula, E q The remaining energy in the energy storage after the qth energy transfer process is completed; This represents idle capacity for energy storage. η D For energy storage discharge efficiency, E Storage This represents the actual capacity requirements for energy storage.

6. A novel power system energy storage capacity demand calculation system, used to implement the novel power system energy storage capacity demand calculation method for power supply security as described in claim 1, characterized in that, include: The extreme value calculation module for energy storage capacity demand is used to calculate the maximum and minimum values ​​of energy storage capacity demand based on the surplus and deficit electricity of the system at various time periods before the new power system has played a role. The system's power deficit calculation module is used to set the initial value of the actual energy storage capacity demand as the minimum value of the energy storage capacity demand. By substituting the actual energy storage capacity, the module simulates the energy "transfer" process of the energy storage and calculates the remaining power deficit of the system. The energy storage capacity demand iterative calculation module is used to obtain the actual energy storage capacity demand of the new power system by iteratively calculating the actual energy storage capacity value based on the remaining power deficit of the system.

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