Method and device for evaluating regulation capability of flexible resources of power system source, network, load and storage

Abstract

The application provides a kind of power system source network load storage flexibility resource regulation ability evaluation method and equipment, and evaluation method includes the following steps: constructing flexibility resource regulation model, according to system total load, variable coefficient, new energy output, nuclear power base load and flexibility resource regulation model respectively calculated to obtain remaining load interval, maximum climbing demand, regulation power interval and maximum climbing power;Comparison of remaining load interval and regulation power interval evaluates the power regulation capability of power system source network load storage;Comparison of maximum climbing demand and maximum climbing power evaluates the climbing capability of power system source network load storage.The power system source network load storage flexibility resource regulation ability evaluation method and equipment provided by the application are used to evaluate the power regulation capability and climbing capability of power system, can identify power system operation risk, evaluation result is specific and quantified, provides optimization direction for flexibility resource configuration, and has strong applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system source network load storage scheduling, in particular to a power system source network load storage flexibility resource regulation capacity evaluation method and device. BACKGROUND

[0002] The key to addressing global climate change and achieving sustainable development lies in the green and low-carbon transformation of energy. Countries around the world have established carbon neutralization targets in line with their national conditions. Building a new type of power system is an important measure for China to achieve clean energy utilization. In the new type of power system, the penetration rate of renewable energy such as wind power and photovoltaic power is continuously increasing, which increases the risk of safe and stable operation and creates more flexible regulation needs. Structural contradictions in power supply and insufficient system peak shaving capacity are the core problems restricting the development of renewable energy. Therefore, it is necessary to fully tap the regulation potential of various flexible resources of source network load storage to cope with the randomness, volatility and intermittency of new energy output. It is of great significance to clarify the regulation capacity of different flexible resources and evaluate the overall regulation capacity for the safe development of new type of power system.

[0003] In traditional power systems, power sources are mainly controllable thermal power units and hydroelectric units, which have strong load tracking ability and regulation performance. With the continuous development of large-scale wind and photovoltaic renewable energy generation and distributed power supply, the proportion of power sources with insufficient regulation capacity and strong uncertainty in output in the power supply structure has increased significantly. Simple reliance on thermal power flexibility transformation cannot meet the safety and stability needs of new type of power system, and the flexibility problem of new type of power system has emerged. Flexible resources of more types and stronger regulation performance are needed to ensure real-time dynamic supply and demand balance and safety and stability of power system. Improving flexibility is a key way for new type of power system to cope with volatility and uncertainty, which has attracted widespread attention from domestic and foreign scholars.

[0004] Power system flexibility is provided by various types of regulation resources, which are distributed in various links of power supply side, grid side, load side and energy storage side. Flexible resources on the power supply side mainly include coal-fired power flexibility transformation and hydroelectric power with regulation performance; flexible resources on the grid side include interconnection, flexible power transmission and microgrid; flexible resources on the load side mainly include adjustable load and electric vehicle grid collaboration; and flexible resources on the energy storage side are represented by new type of energy storage and pumped storage. However, the development of current flexible resources lags behind the random and volatile power sources such as wind power and photovoltaic power, and cannot meet the requirements of high proportion of new energy power system development. The utilization rate of new energy has decreased in different degrees in various places, and the system regulation and operation pressure will continue to increase in the future with the increase of new energy penetration rate.

[0005] The technical characteristics of various resources provide flexibility with obvious differences and different economic costs. The deep peak shaving and rapid start-stop technology of traditional thermal power units has strong regulation ability, but is often accompanied by high operating costs and emissions. The grid-side flexibility improvement, such as smart grid technology, can significantly improve the intelligence and automation level of the power grid, but the initial investment is large and the long-term benefits are significant. The flexibility resources on the load side have the characteristics of fast response and flexible regulation, and can encourage users to participate through market mechanisms, but their economic costs are greatly affected by user willingness and behavior patterns. The energy storage side as an important supplement to flexibility has various technical types and significant cost differences, and different energy storage methods have advantages and disadvantages in capacity, efficiency, life, and environmental impact. Existing research mainly considers the regulation effect of different flexible resources on the energy system, but cannot depict the rich regulation ability.

[0006] In the process of improving the flexibility of the power system, the technical characteristics and economic costs of various resources need to be considered comprehensively, and scientific and reasonable planning and scheduling strategies need to be developed. The feasibility and necessity should be fully considered, and the development should not be excessive and disorderly, and the principles of complementary advantages, moderate advance, and overall planning should be followed to improve the flexibility of the system in an all-round, efficient, and most economical way, from the transition of "source following load" to the coordinated development of "source, grid, load, and storage". The basic premise of achieving this goal is to accurately and scientifically evaluate the regulation ability of the existing flexible resources of the power system. Source, grid, load, and storage have different flexibility characteristics, and the overall regulation ability is not simply linear addition or subtraction, so a scientific evaluation method and device need to be designed.

[0007] In summary, existing research has recognized the importance of flexibility to the new power system and analyzed the technical characteristics, economic level, and regulation effect of different flexible resources. The combination of multiple flexible resources can achieve complementary advantages, maximize the flexibility of the system, and enhance the carrying capacity of renewable energy. There are many types and quantities of flexible resources, and existing technologies have not studied the evaluation method of the regulation ability of source, grid, load, and storage flexibility resources. SUMMARY

[0008] The present application provides a power system source, grid, load, and storage flexibility resource regulation ability evaluation method and device for evaluating the power regulation ability and climbing ability of the power system, identifying the operation risk of the power system, quantifying the evaluation results, providing optimization direction for flexible resource configuration, and having strong applicability.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a power system source, grid, load, and storage flexibility resource regulation ability evaluation method, comprising the following steps:

[0010] Obtain the operating parameters, variable coefficients, system total load, new energy output, and nuclear power base load of the power system source, grid, load, and storage.

[0011] constructing a flexibility resource regulation model according to the operation parameters, the flexibility resource regulation model comprising an energy production regulation model, an energy transmission network regulation model, an energy consumption regulation model and an energy storage regulation model;

[0012] the energy production regulation model comprising an output power lower limit, an output power upper limit and a nominal ramping upper limit;

[0013] the energy transmission network regulation model comprising a transmission line power upper limit;

[0014] the energy consumption regulation model comprising a maximum transferable load maximum transfer amount and an interruptible load maximum curtailment amount;

[0015] the energy storage regulation model comprising a charging power upper limit and a discharging power upper limit;

[0016] obtaining a residual load lower limit and a residual load upper limit according to the system total load, the variable coefficient, the new energy output, the nuclear power base load and the transmission line power upper limit;

[0017] obtaining a residual load interval and a maximum ramping demand according to the residual load lower limit and the residual load upper limit;

[0018] obtaining a regulation power upper limit according to the variable coefficient, the output power upper limit, the maximum transferable load maximum transfer amount, the interruptible load maximum curtailment amount and the discharging power upper limit, and obtaining a regulation power lower limit according to the variable coefficient, the output power lower limit, the maximum transferable load maximum transfer amount and the charging power upper limit;

[0019] obtaining a regulation power interval according to the regulation power upper limit and the regulation power lower limit;

[0020] obtaining a maximum ramping power according to the variable coefficient, the output power upper limit, the nominal ramping upper limit and the discharging power upper limit;

[0021] evaluating the power regulation capability of the power system source network load storage by comparing the residual load interval and the regulation power interval;

[0022] evaluating the ramping capability of the power system source network load storage by comparing the maximum ramping demand and the maximum ramping power.

[0023] Further, the evaluating the power regulation capability of the power system source network load storage comprises:

[0024] the power of the power system source network load storage is regulatable when the residual load interval is located in the regulation power interval;

[0025] When the remaining load lower limit is lower than the regulation power lower limit, the power of the power system source grid load storage is short of downward regulation space;

[0026] When the remaining load upper limit is higher than the regulation power upper limit, the power of the power system source grid load storage is short of upward regulation space.

[0027] Further, the regulation power upper limit is 10% higher than the remaining load upper limit, and the regulation power lower limit is 5% lower than the remaining load lower limit.

[0028] Further, when the maximum ramping power is not lower than the maximum ramping demand, the power system source grid load storage has ramping flexibility.

[0029] Further, the maximum ramping power is more than 2 times the maximum ramping demand.

[0030] Further, the operation parameters include operation state, rated capacity, minimum output percentage, maximum output percentage, slide limit percentage, ramping limit percentage, minimum continuous operation time, minimum continuous shutdown time, and typical daily distribution power;

[0031] The energy production regulation model includes a first coal-fired power regulation model, a second coal-fired power regulation model, a gas-fired power regulation model, and a hydropower regulation model;

[0032] The first coal-fired power regulation model, the second coal-fired power regulation model, and the gas-fired power regulation model each include an output power constraint, a ramping constraint, and an operation state constraint;

[0033] The hydropower regulation model includes an output power constraint and a total output power constraint;

[0034] The output power lower limit is obtained according to the operation state, the rated capacity, and the minimum output percentage;

[0035] The output power upper limit is obtained according to the operation state, the rated capacity, and the maximum output percentage;

[0036] A nominal slide upper limit is obtained according to the slide limit percentage and the rated capacity;

[0037] The nominal ramping upper limit is obtained according to the ramping limit percentage and the rated capacity;

[0038] The output power constraint is obtained according to the output power lower limit and the output power upper limit; and the total output power constraint is obtained according to the output power constraint and the typical daily distribution power;

[0039] The ramping constraint is obtained according to the nominal slide upper limit and the nominal ramping upper limit;

[0040] obtaining the operation state constraint according to the operation state, the minimum continuous operation time and the minimum continuous shutdown time.

[0041] Further, the energy transmission network regulation model comprises a transmission line power constraint;

[0042] obtaining a transmission line power lower limit according to the rated capacity and the minimum output percentage;

[0043] obtaining a transmission line power upper limit according to the rated capacity and the maximum output percentage;

[0044] obtaining the transmission line power constraint according to the transmission line power lower limit and the transmission line power upper limit.

[0045] Further, the operation parameters further comprise a maximum transfer percentage of transferable load and a maximum reduction percentage of interruptible load;

[0046] The energy consumption regulation model comprises a transferable flexible load model and an interruptible flexible load model;

[0047] The transferable flexible load model comprises a total amount of transferable load constraint, a transferable load transfer amount constraint; the interruptible flexible load model comprises an interruptible load reduction amount constraint; the transferable load transfer amount constraint comprises a transferable load transfer-in amount constraint and a transferable load transfer-out amount constraint;

[0048] obtaining a maximum transfer-in amount of transferable load and a maximum transfer-out amount of transferable load according to the maximum transfer percentage of transferable load and the total system load;

[0049] obtaining the transferable load transfer-in amount constraint according to the maximum transfer-in amount of transferable load;

[0050] obtaining the transferable load transfer-out amount constraint according to the maximum transfer-out amount of transferable load;

[0051] obtaining the total amount of transferable load constraint according to the transferable load transfer-in amount constraint and the transferable load transfer-out amount constraint;

[0052] obtaining a maximum reduction amount of interruptible load according to the maximum reduction percentage of interruptible load and the total system load;

[0053] obtaining the interruptible load reduction amount constraint according to the maximum reduction amount of interruptible load.

[0054] Further, the operation parameters further comprise a charging and discharging efficiency, a minimum charging limit, a maximum charging limit, a minimum discharging limit, a maximum discharging limit, a minimum capacity limit, a maximum capacity limit, a charging state and a discharging state;

[0055] the energy storage regulation model comprises an energy storage capacity model, a charging power constraint, a discharging power constraint, a charging and discharging state constraint, and a capacity balance constraint;

[0056] obtaining a charging power lower limit according to the charging state and the minimum charging limit;

[0057] obtaining a charging power upper limit according to the charging state and the maximum charging limit;

[0058] obtaining a discharging power lower limit according to the discharging state and the minimum discharging limit;

[0059] obtaining a discharging power upper limit according to the discharging state and the maximum discharging limit;

[0060] obtaining the charging power constraint according to the charging power lower limit and the charging power upper limit;

[0061] obtaining the discharging power constraint according to the discharging power lower limit and the discharging power upper limit;

[0062] obtaining the charging and discharging state constraint according to the charging state and the discharging state;

[0063] obtaining the capacity balance constraint according to the minimum capacity limit and the maximum capacity limit;

[0064] obtaining the energy storage capacity model according to the charging and discharging efficiency, the charging power constraint, the discharging power constraint, and the capacity balance constraint.

[0065] An apparatus for implementing the power system source-grid-load-storage flexibility resource regulation capability evaluation method, comprising a modeling unit, a calculation unit, and an evaluation unit;

[0066] The modeling unit:

[0067] is configured to obtain the operating parameters of the power system source-grid-load-storage, the variable coefficient, the system total load, the new energy output, and the nuclear power base load;

[0068] is configured to construct the flexibility resource regulation model according to the operating parameters;

[0069] The calculation unit:

[0070] is configured to obtain a residual load lower limit and a residual load upper limit according to the system total load, the variable coefficient, the new energy output, the nuclear power base load, and the power upper limit of the transmission line;

[0071] is configured to obtain a residual load interval and a maximum ramping demand according to the residual load lower limit and the residual load upper limit.

[0072] obtaining an adjusted power upper limit according to the variable coefficient, the output power upper limit, the maximum transferable load, the maximum cutback of interruptible load and the discharge power upper limit; obtaining an adjusted power lower limit according to the variable coefficient, the output power lower limit, the maximum transferable load and the charge power upper limit;

[0073] obtaining an adjusted power interval according to the adjusted power upper limit and the adjusted power lower limit;

[0074] obtaining a maximum ramping power according to the variable coefficient, the output power upper limit, the nominal ramping upper limit and the discharge power upper limit;

[0075] the evaluation unit:

[0076] evaluating the power adjustment capability of the power system source network load storage by comparing the residual load interval and the adjusted power interval;

[0077] evaluating the ramping capability of the power system source network load storage by comparing the maximum ramping demand and the maximum ramping power.

[0078] Compared with the prior art, the present application has the following beneficial effects:

[0079] 1. The present application establishes various types of flexible resource adjustment models, starting from the significant differences in adjustment capability of different flexible resources, and under the premise of considering the operation characteristics of the power system and the adjustment characteristics of various types of flexible resources, in order to take advantage of the complementarity of source network load storage, a flexible resource adjustment capability evaluation method is proposed, which can respectively evaluate the power adjustment capability and the ramping capability of the power system, and can meet the evaluation needs of different types and quantities of flexible resources.

[0080] 2. The present application evaluates the power adjustment capability of the power system source network load storage by comparing the residual load interval and the adjusted power interval, and evaluates the ramping capability of the power system source network load storage by comparing the maximum ramping demand and the maximum ramping power. The evaluation results are specific and quantified, which provides an optimization direction for flexible resource configuration, ensures the safe, stable and reliable power supply, and realizes clean and efficient energy utilization.

[0081] 3. The flexible resource adjustment capability evaluation method of the power system source network load storage proposed in the present application can determine the power adjustable range and the ramping capability of the flexible resource, and identify the operation risk of the power system. It provides a new theoretical framework for reasonably evaluating the system adjustment performance, and has important reference value for the construction of new type power system. BRIEF DESCRIPTION OF DRAWINGS

[0082] Figure 1Flow chart of the method for evaluating the regulation capability of flexible resources of a power system source network load and storage according to the present application;

[0083] Figure 2 Principle diagram of the method for evaluating the regulation capability of flexible resources of a power system source network load and storage according to the present application;

[0084] Figure 3 Installed capacity and annual utilization hours of various resources in the example according to the present application;

[0085] Figure 4 Typical daily load, wind power and photovoltaic power in the example according to the present application;

[0086] Figure 5 Schematic diagram of the remaining load in the example according to the present application;

[0087] Figure 6 Regulation capability of various flexible resources in the example according to the present application;

[0088] Figure 7 Regulation power interval and remaining load interval in the example according to the present application;

[0089] Figure 8 Regulation power interval of flexible resources in different schemes in the example according to the present application. DETAILED DESCRIPTION

[0090] It should be noted that the methods used in the present application are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified, and their sources are not specifically limited.

[0091] New power systems have an increasing demand for flexible resources to cope with the volatility and uncertainty of renewable energy. Embodiments of the present application provide a method for evaluating the regulation capability of flexible resources of a power system source network load and storage, comprising the following steps:

[0092] Obtaining the operating parameters, variable coefficients, total load, new energy output and nuclear power base load of the power system source network load and storage;

[0093] Constructing a flexible resource regulation model according to the operating parameters, the flexible resource regulation model including an energy production regulation model, an energy transmission network regulation model, an energy consumption regulation model and an energy storage regulation model;

[0094] The energy production regulation model includes an output power lower limit, an output power upper limit and a nominal ramping upper limit;

[0095] The energy transmission network regulation model includes a power transmission line power upper limit;

[0096] The energy consumption regulation model includes a maximum transferable load maximum transfer amount and an interruptible load maximum reduction amount;

[0097] The energy storage regulation model includes a charging power upper limit and a discharging power upper limit;

[0098] The remaining load lower limit and the remaining load upper limit are obtained according to the total system load, the variable coefficient, the new energy output, the nuclear power base load and the power upper limit of the transmission line;

[0099] The remaining load interval and the maximum climbing demand are obtained according to the remaining load lower limit and the remaining load upper limit;

[0100] Because new energy (such as wind power, photovoltaic, etc.) has uncertainty, the new energy net load curve will also fluctuate up and down, nuclear power as a base load almost does not participate in the daily regulation, and the energy transmission network (such as the transmission line) is usually determined by the receiving end according to the demand, and the regulation capacity is limited, therefore, the total system load is deducted from the new energy output, and then the nuclear power base load and the transmission line load are further deducted, that is, the remaining load is obtained, which is filled by other resources in the source, network, load and storage of the power system; the remaining load is:

[0101]

[0102] In the formula, Prest is the remaining load at time t, Ptotal is the total system load at time t, P WT,t Pwind is the wind power output at time t, P PV,t Ppv is the photovoltaic output at time t, P NP,t Pnuclear is the nuclear power base load at time t, Ptransmission is the total power of the transmission line at time t, l is the transmission line number, and L is the total number of transmission lines;

[0103] In order to ensure the safe operation of the system, the interval range determined by the remaining load lower limit and the remaining load upper limit is needed to depict the remaining load, that is, to obtain the remaining load interval, considering the variable coefficient, at this time, the variable coefficient is the fluctuation deviation of the new energy output, the fluctuation deviation of the new energy output includes the fluctuation deviation of the wind power output and the fluctuation deviation of the photovoltaic output, then:

[0104]

[0105]

[0106] In the formula, Prest is the remaining load at time t, Prest is the remaining load at time t, δ WT δwind is the fluctuation deviation of the wind power output, δ PV δpv is the fluctuation deviation of the photovoltaic output;

[0107] ​In addition, the total power of flexible resources needs to track the fluctuation of the residual load, meet the hourly climbing power demand and the hourly sliding power demand; since the climbing and sliding processes are similar, only the climbing ability needs to be analyzed; the maximum climbing demand is:

[0108]

[0109] where ΔL flex is the maximum climbing demand, max is the maximum function, is the lower limit of the residual load at time (t-1).

[0110] The upper limit of the adjustment power is obtained according to the variable coefficient, the upper limit of the output power, the maximum transfer amount of the transferable load, the maximum reduction amount of the interruptible load and the upper limit of the discharge power; the lower limit of the adjustment power is obtained according to the variable coefficient, the lower limit of the output power, the maximum transfer amount of the transferable load and the upper limit of the charging power;

[0111] Considering the operating characteristics of various types of flexible resources, the upper limit of the adjustment power is determined by the maximum output power of the energy production part, i.e. the upper limit of the output power (the maximum power of the coal-fired power unit, the maximum power of the flexible coal-fired power unit, the maximum power of the gas-fired power unit and the maximum power of the hydroelectric power unit), the maximum power of the energy consumption part, i.e. the maximum transfer amount of the transferable load and the maximum reduction amount of the interruptible load, and the maximum discharge power of the energy storage part, i.e. the maximum discharge power of the energy storage. However, it also needs to be combined with the actual operation of the power system, and not every flexible resource can provide adjustment service at every time period, such as: the coal-fired power unit is under planned maintenance and shutdown, and cannot provide adjustment service; during the heating season, the adjustment capacity of the coal-fired power unit decreases; the adjustment capacity of the flexible coal-fired power unit is improved, but the above-mentioned situation still exists; the gas-fired power unit is similar to the coal-fired power unit; the adjustment of the hydroelectric power unit is limited by the water distribution scheme; the transfer amount of the transferable load and the interruptible load cannot last for too long a time;

[0112] In application, the variable coefficient of adjustment confidence coefficient needs to be considered, the adjustment confidence coefficient includes the upward adjustment confidence coefficient and the downward adjustment confidence coefficient, then:

[0113]

[0114]

[0115] wherein, is the upper limit of the adjustment power, is the upward adjustment confidence coefficient of the coal-fired power unit, is the upper limit of the output power of the i-th coal-fired power unit, i is the serial number of the coal-fired power unit, I is the total number of coal-fired power units, is the output power upper limit of the jth flexible coal-fired power unit, j is the serial number of the flexible coal-fired power unit, and J is the total number of flexible coal-fired power units. Adjust the reliability factor upward for the gas generator set. is the upper limit of the output power of the mth gas-generator unit, m is the sequence number of the gas-generator unit, M is the total number of gas-generator units, Adjust the credibility factor upward for the hydropower unit. is the upper limit of the output power of the kth hydropower unit, k is the sequence number of the gas-fired unit, K is the total number of gas-fired units, Adjust the credibility factor upward for transferable loads, is the maximum transfer amount of transferable load, Adjust the credibility factor upward for interruptible loads, is the maximum interruptible load reduction, Adjust the reliability factor upward for the energy storage unit. is the upper limit of discharge power, P t flex To adjust the power lower limit, ρ CP Adjust the credibility factor downward for coal-fired power units. is the lower limit of the output power of the i-th coal-fired power unit, is the lower limit of the output power of the jth flexible coal-fired power unit, ρ GP Adjust the credibility factor downward for the gas generator set. is the lower limit of the output power of the mth gas-generator unit, ρ HP Adjust the credibility factor downward for the hydropower unit. is the lower limit of the output power of the kth hydropower unit, ρ TFL Adjust the credibility coefficient downward for transferable load, ρ ES Adjust the reliability factor downward for the energy storage unit. The upper limit of charging power.

[0116] The adjustment power range is obtained according to the adjustment power upper limit and the adjustment power lower limit, that is, the adjustment power range is

[0117] The maximum climbing power is obtained according to the variable coefficient, the output power upper limit, the nominal climbing upper limit and the discharge power upper limit; since the gas-electricity unit, the hydropower unit and the energy storage unit can all reach the rated power in a very short time, the climbing power of the gas-electricity unit, the hydropower unit and the energy storage unit can all be considered as the rated installation, that is, the output power upper limit (for the gas-electricity unit and the electric unit) or the discharge power upper limit (for the energy storage unit). After comprehensively considering these factors, the maximum climbing power is determined by the nominal climbing upper limit of the coal-fired power unit, the nominal climbing upper limit of the flexible coal-fired power unit, the output power upper limit of the gas-electricity unit, the output power upper limit of the hydropower unit and the discharge power upper limit of the energy storage unit. However, the climbing of the flexible resource is limited, for example, when in the maximum power state, the flexible resource cannot provide climbing; when the energy storage unit has no power storage, it also cannot provide climbing. The climbing credibility coefficient, which is a variable coefficient, is introduced to correct the real climbing ability of various flexible resources, and is used to eliminate the cases that the unit is under maintenance, full power, full power storage, etc. The total climbing power of the flexible resource, that is, the maximum climbing power, is:

[0118]

[0119] In the formula, ΔP flex is the maximum climbing power, σ CP is the coal-fired power unit climbing credibility coefficient, is the nominal climbing upper limit of the i th coal-fired power unit, is the nominal climbing upper limit of the j th flexible coal-fired power unit, σ GP is the gas-electricity unit climbing credibility coefficient, σ HP is the hydropower unit climbing credibility coefficient, and σ ES is the energy storage unit climbing credibility coefficient.

[0120] The power regulation ability of the power system source, network, load and storage is evaluated by comparing the residual load interval and the regulation power interval.

[0121] The climbing ability of the power system source, network, load and storage is evaluated by comparing the maximum climbing demand and the maximum climbing power.

[0122] The evaluation of the coordinated regulation ability of the source, network, load and storage flexible resources needs to include multiple dimensions: regulation direction, regulation rate and regulation depth, which can be reflected by the regulation power interval and the maximum climbing power of the combined flexible resources. The regulation power interval and the maximum climbing power are obtained by respectively modeling the flexible resource regulation model, and the residual load interval and the maximum climbing demand are obtained by combining the total load, the variable coefficient, the new energy output and the nuclear power base load. The power regulation ability of the power system source, network, load and storage is evaluated by comparing the regulation power interval and the residual load interval, and the climbing ability of the power system source, network, load and storage is evaluated by comparing the maximum climbing demand and the maximum climbing power.

[0123] The power regulation capability of the power system source network load storage is evaluated by comparing the residual load interval with the regulation power interval

[0124] When the residual load interval is within the regulation power interval, that is, the regulation power interval at least envelopes the residual load interval, the power of the power system source network load storage can be regulated; when the supply is less than the demand, leading to power supply problems; when the supply is greater than the demand, leading to renewable energy consumption problems.

[0125] Preferably, the upper limit of the regulation power is higher than the upper limit of the residual load It can be considered that the power system source network load storage has strong safety and reliability, and such regulation capability can effectively cope with the fluctuation of the load and ensure the stability of the power supply. When the lower limit of the regulation power is lower than the lower limit of the residual load by 5%, the power system source network load storage has sufficient renewable energy consumption capability.

[0126] When the lower limit of the residual load is lower than the lower limit of the regulation power, the power of the power system source network load storage has insufficient downward regulation space;

[0127] When the upper limit of the residual load is higher than the upper limit of the regulation power, the power of the power system source network load storage has insufficient upward regulation space.

[0128] By comparing the maximum climbing demand ΔL flex and the maximum climbing power ΔP flex , when the maximum climbing power is not less than the maximum climbing demand, the power system source network load storage has climbing flexibility.

[0129] Preferably, the maximum climbing power is more than twice the maximum climbing demand, and there is sufficient climbing flexibility to cope with the load fluctuation of the power system source network load storage and new energy. It should be noted that when the installed capacity of wind turbines and photovoltaic units increases, more climbing demand will be brought, and flexible transformation of coal-fired units can increase the climbing capability of the power system source network load storage.

[0130] In constructing the energy production regulation model, the operating parameters include operating state, rated capacity, minimum output percentage, maximum output percentage, sliding slope limit percentage, climbing slope limit percentage, minimum continuous operation time, minimum continuous shutdown time, and typical day distribution power;

[0131] The energy production regulation model includes a first coal-fired regulation model, a second coal-fired regulation model, a gas-fired regulation model, and a hydropower regulation model; the first coal-fired regulation model is for coal-fired units, the second coal-fired regulation model is for flexible transformation coal-fired units, the gas-fired regulation model is for gas-fired units, and the hydropower regulation model is for hydropower units;

[0132] The first coal power regulation model, the second coal power regulation model and the gas power regulation model each include an output power constraint, a ramp constraint and an operating state constraint;

[0133] The hydro power regulation model includes an output power constraint and a total output power constraint;

[0134] An output power lower limit is obtained according to the operating state, the rated capacity and the minimum output percentage;

[0135] An output power upper limit is obtained according to the operating state, the rated capacity and the maximum output percentage;

[0136] A nominal ramp upper limit is obtained according to the ramp limit percentage and the rated capacity;

[0137] A nominal ramp upper limit is obtained according to the ramp limit percentage and the rated capacity;

[0138] The output power constraint is obtained according to the output power lower limit and the output power upper limit; the total output power constraint is obtained according to the output power constraint and the typical day distribution power;

[0139] The ramp constraint is obtained according to the nominal ramp upper limit and the nominal ramp upper limit;

[0140] The operating state constraint is obtained according to the operating state, the minimum continuous operating time and the minimum continuous shutdown time.

[0141] Coal power units have large single machine capacity and stable operation, but coal power with no flexibility modification has high minimum output, slow ramp rate and long time required for start and stop. The first coal power regulation model is:

[0142]

[0143] In the formula, u i,t is the operating state of the i th coal power unit at t time, the value is 0 or 1, 0 represents shutdown, 1 represents operation, is the minimum output percentage of the i th coal power unit, is the maximum output percentage of the i th coal power unit, and represent the adjustable range of the coal power unit, is that is, the output power lower limit of the i th coal power unit, is that is, the output power upper limit of the i th coal power unit, C CP,i is the rated installed capacity of the i th coal power unit, represents the maximum adjustable output of the source, network, load and storage of the power system, is the ramp limit percentage of the i th coal power unit, is the ramp limit percentage of the i th coal power unit, (PCP,i,t -P CP,i,t-1 Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Ti is the minimum continuous operation time of the ith coal-fired unit, Ti is the minimum continuous operation time of the ith coal-fired unit,

[0144] The flexible reforming coal-fired unit has great economic advantages and will be the main flexible supply subject. The minimum output of the flexible reforming coal-fired unit is reduced, the ramping rate is improved, and the start-up time is shortened. The adjustment model of the flexible reforming coal-fired unit, that is, the second coal-fired adjustment model, is as follows:

[0145]

[0146]

[0147] In the formula, Sj(t) is the operation state of the jth flexible reforming coal-fired unit at time t, and the value is 0 or 1, 0 represents shutdown, and 1 represents operation, Pj is the minimum output percentage of the jth flexible reforming coal-fired unit, Pj is the maximum output percentage of the jth flexible reforming coal-fired unit, and represent the adjustable range of the flexible reforming coal-fired unit, Pj(t) is the output power lower limit of the jth flexible reforming coal-fired unit, Pj(t) is the output power lower limit of the jth flexible reforming coal-fired unit, Pj(t) is the output power lower limit of the jth flexible reforming coal-fired unit, Pj(t) is the output power lower limit of the jth flexible reforming coal-fired unit, Pj is the rated installed capacity of the jth flexible reforming coal-fired unit, and represents the maximum adjustable output of the source, network, load, and storage of the power system, Pj is the ramping limit percentage of the jth flexible reforming coal-fired unit, Pj is the ramping limit percentage of the jth flexible reforming coal-fired unit, Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Pi(t) is the nominal ramping power of the ith coal-fired unit at time t, Ti is the minimum continuous operation time of the ith coal-fired unit, Ti is the minimum continuous operation time of the ith coal-fired unit,

[0148] Gas-fired power units have a larger adjustment range, faster adjustment rate, and shorter start-up and shutdown time than coal-fired power units. The flexibility adjustment model of gas-fired power units, i.e., the gas-fired power adjustment model, is similar to that of coal-fired power units. The gas-fired power adjustment model is:

[0149]

[0150] Where u m,t is the operating status of the mth gas-generator unit at time t, with a value of 0 or 1, 0 means shutdown, 1 means running, is the minimum output percentage of the mth gas generator set, is the maximum output percentage of the mth gas generator set, and Indicates the adjustable range of the gas-generator unit. for That is the lower limit of the output power of the mth gas-generator unit, for That is the upper limit of the output power of the mth gas-generator unit, C GP,m is the rated installed capacity of the mth gas-fired generator set, which represents the maximum adjustable output of the power system source, grid, load and storage. is the landslide limit percentage of the mth gas-fired generator unit, is the climbing limit percentage of the mth gas generator set, (P GP,m,t -P GP,m,t-1 ) is the nominal climbing power of the mth gas generator set at time t, for That is the nominal climbing limit of the mth gas generator set, is the minimum continuous operating time of the mth gas-generator unit, is the minimum continuous shutdown time of the mth gas-generator unit;

[0151] Hydropower units have strong regulation capabilities, with very fast ramping and start-up / shutdown rates. The generating capacity of a hydropower unit is related to the amount of water flowing in, which varies seasonally. The allocation of adjustable hydropower water needs to be planned on a long-term, year-round basis. The flexible regulation model for hydropower units, or the hydropower regulation model, is:

[0152]

[0153] Where, is the minimum output percentage of the kth hydropower unit, C HP,k is the rated installed capacity of the kth hydropower unit, P HP,k,t is the output power of the kth hydropower unit at time t, is the maximum output percentage of the kth hydropower unit, T is the total operating time, for is the lower limit of the output power of the kth hydroelectric generating unit, is is the upper limit of the output power of the kth hydroelectric generating unit, E HP,k is the typical daily distribution power of the kth hydroelectric generating unit, indicating the typical daily power distribution to the kth hydroelectric generating unit by the dispatch personnel according to the annual power generation plan;

[0154] The nuclear power generating unit is usually operated at full power as a base load, and the occupation of the power generation space will increase the system peak regulation pressure, resulting in the problem of wind and light curtailment. Since the regulation rate is slow, no flexible regulation modeling is performed.

[0155] In constructing the energy consumption regulation model, the operating parameters also include the rated capacity, the minimum output percentage and the maximum output percentage, and the energy transmission network regulation model includes the power constraint of the transmission line;

[0156] The lower limit of the power of the transmission line is obtained according to the rated capacity and the minimum output percentage;

[0157] The upper limit of the power of the transmission line is obtained according to the rated capacity and the maximum output percentage;

[0158] The power constraint of the transmission line is obtained according to the lower limit of the power of the transmission line and the upper limit of the power of the transmission line.

[0159] The power of the transmission line is mainly determined by the receiving end, and when the local power generation of the receiving end cannot meet the load, the sending end realizes the cross-regional optimal allocation of electric energy through the energy transmission network (in this embodiment, through the transmission line). The transmission line can improve the safety guarantee capacity of the receiving end area and increase the space for renewable energy consumption in the sending end area. The energy transmission network regulation model is:

[0160]

[0161] In the formula, is the minimum output percentage of the lth transmission line, C TL,l is the rated capacity of the lth transmission line, P TL,l,t is the power of the lth transmission line at time t, is the maximum output percentage of the lth transmission line, is the upper limit of the power of the lth transmission line.

[0162] In constructing the energy consumption regulation model, the operating parameters also include the maximum transfer ratio of the transferable load and the maximum reduction ratio of the interruptible load;

[0163] The energy consumption regulation model includes the transferable flexible load model and the interruptible flexible load model;

[0164] The transferable flexible load model comprises a transferable load total amount constraint and a transferable load transfer amount constraint; the interruptible flexible load model comprises an interruptible load reduction amount constraint; the transferable load transfer amount constraint comprises a transferable load transfer-in amount constraint and a transferable load transfer-out amount constraint;

[0165] The transferable load maximum transfer-in amount and the transferable load maximum transfer-out amount are obtained according to the maximum transferable load transfer ratio and the system total load;

[0166] The transferable load transfer-in amount constraint is obtained according to the transferable load maximum transfer-in amount;

[0167] The transferable load transfer-out amount constraint is obtained according to the transferable load maximum transfer-out amount;

[0168] The transferable load total amount constraint is obtained according to the transferable load transfer-in amount constraint and the transferable load transfer-out amount constraint;

[0169] The interruptible load maximum reduction amount is obtained according to the maximum interruptible load reduction ratio and the system total load;

[0170] The interruptible load reduction amount constraint is obtained according to the interruptible load maximum reduction amount.

[0171] Flexible loads participating in demand response can be divided into transferable flexible loads (TFL) and interruptible flexible loads (IFL). Transferable loads can change the electricity use time, such as electric vehicle charging. Interruptible loads can reduce the electricity use amount during the load peak period, such as industrial manufacturers. The adjustment characteristics of flexible loads are incentive guidance and fast response. The energy consumption adjustment model constructed for flexible loads is:

[0172]

[0173] In the formula, is the transfer-in amount of the transferable load at t, is the transfer-out amount of the transferable load at t, is the maximum transferable load transfer ratio, is the system total load at t, L IFL,t is the reduction amount of the interruptible load at t, is the maximum interruptible load reduction ratio, is is the maximum transferable load transfer amount, is is the maximum interruptible load reduction amount;

[0174] In constructing the energy storage regulation model, the operation parameters further include a charging and discharging efficiency, a minimum charging limit, a maximum charging limit, a minimum discharging limit, a maximum discharging limit, a minimum capacity limit, a maximum capacity limit, a charging state and a discharging state;

[0175] The energy storage regulation model includes an energy storage capacity model, a charging power constraint, a discharging power constraint, a charging and discharging state constraint and a capacity balance constraint;

[0176] A lower limit of the charging power is obtained according to the charging state and the minimum charging limit;

[0177] An upper limit of the charging power is obtained according to the charging state and the maximum charging limit;

[0178] A lower limit of the discharging power is obtained according to the discharging state and the minimum discharging limit;

[0179] An upper limit of the discharging power is obtained according to the discharging state and the maximum discharging limit;

[0180] The charging power constraint is obtained according to the lower limit of the charging power and the upper limit of the charging power;

[0181] The discharging power constraint is obtained according to the lower limit of the discharging power and the upper limit of the discharging power;

[0182] The charging and discharging state constraint is obtained according to the charging state and the discharging state;

[0183] The capacity balance constraint is obtained according to the minimum capacity limit and the maximum capacity limit;

[0184] The energy storage capacity model is obtained according to the charging and discharging efficiency, the charging power constraint, the discharging power constraint and the capacity balance constraint.

[0185] The energy storage capacity of the energy storage unit is determined by the energy storage capacity at the previous time and the charging and discharging capacity at the current time. The energy storage unit needs to meet the charging power constraint, the discharging power constraint, the charging and discharging state constraint and the capacity balance constraint. The energy storage unit includes electrochemical energy storage and pumped storage, wherein the adjustment characteristics of the electrochemical energy storage are fast adjustment, short duration and small scale, the adjustment characteristics of the pumped storage are fast adjustment, short duration and large scale, the electrochemical energy storage and the pumped storage are similar in modeling and can be combined in modeling, that is, the energy storage regulation model is:

[0186]

[0187] C ES,1 =C ES,24 ;

[0188] In the formula, C ES,t is the energy storage capacity of the energy storage unit at time t, which determines the subsequent adjustment capacity of the energy storage unit, η ES is the charging and discharging efficiency of the energy storage unit, is the charging efficiency of the energy storage unit at time t, is the discharging efficiency of the energy storage unit at time t, is the charging operation state of the energy storage unit at time t, value is 0 or 1, 0 represents charging, 1 represents not charging, is the minimum charging limit of the energy storage unit, is the maximum charging limit of the energy storage unit, is the discharging operation state of the energy storage unit at time t, value is 0 or 1, 0 represents discharging, 1 represents not discharging, is the minimum discharging limit of the energy storage unit, is the maximum discharging limit of the energy storage unit, is the minimum capacity limit of the energy storage unit, is the maximum capacity limit of the energy storage unit, is the i.e. the upper limit of charging power, is the i.e. the upper limit of discharging power, C ES,1 is the storage capacity of the energy storage unit at the initial period of the day, C ES,24 is the storage capacity of the energy storage unit at the end period of the day;

[0189] The above flexible resource regulation model is integrated, and the regulation power upper limit and the regulation power lower limit are represented as:

[0190]

[0191] The maximum ramping power is represented as:

[0192]

[0193] Example

[0194] A regional power system source network load storage in northern China is taken as an example for example analysis. The region has superior wind and light resources, and the installed capacity of renewable energy accounts for more than 60% of the total installed capacity, becoming the main power source of the power system. Improving the flexibility of the power system is the key to promoting new energy consumption. As of the end of 2023, the total installed capacity of the region is 104.1GW. The installed capacity of various resources is as Figure 3 The flexibility regulation of the power system source network load storage in the region mainly depends on coal-fired power, gas-fired power, hydropower, and energy storage.

[0195] The output range of coal-fired units is usually 50%-100%, and the ramp rate (ramp limit percentage) is 50%. After flexible modification, the minimum output of coal-fired units can be reduced to 30%, and the ramp rate can reach 100%. The output range of gas-fired units is usually 20%-100%. The output range of hydropower is 0-100%. The demand response capacity of flexible load is calculated as 3% of the maximum electricity load (total system load). The output range of energy storage units is -100%-100%, but the duration is 3-5 hours. The confidence coefficient is determined according to the historical operation data of the power system.

[0196] A day in 2023 with large fluctuations in wind turbine output power and photovoltaic output power is selected as a typical day. The load (total system load) and wind power (wind power output) and photovoltaic power (photovoltaic output) of the typical day are as follows Figure 4 According to the prediction experience, the fluctuation deviation of wind power output and the fluctuation deviation of photovoltaic output are both 0.2. The total system load curve in this area is relatively flat, and the peak-valley difference is low. However, the installed capacity of wind power and photovoltaic power is high, and the maximum output of new energy (wind power and photovoltaic power) can reach 46% of the total system load, and the minimum output can reach 28% of the total system load. The difference between the maximum output and the minimum output of new energy (wind power and photovoltaic power) is 18%, and sufficient flexible resources are needed to adjust. For ease of analysis, the average data of the equipment or unit is used as the operating parameter for analysis.

[0197] (1) Evaluate the power regulation capacity of the power system source, network, load, and storage in this area

[0198] Subtracting the wind power output, photovoltaic power output, and total power of the transmission line from the total system load, the remaining load (no nuclear power unit installed in this area, nuclear power base load is 0) can be obtained, as follows Figure 5 (Fig. wind power represents wind power output, photovoltaic represents photovoltaic output, and east represents total power of transmission line). The blue area in the figure is the remaining load, which is the part that needs to be filled by flexible resources. The remaining load range is [12.52, 26.68] GW.

[0199] According to the obtained operation parameters, the coal power regulation interval calculated by the first coal power regulation model and the second coal power regulation model is [14.45, 28.89] GW; the gas power regulation interval calculated by the gas power regulation model is [0.01, 0.04] GW; the water power regulation interval calculated by the water power regulation model is [0, 0.27] GW; the electrochemical energy storage regulation interval calculated by the energy storage regulation model is [-0.21, 0.21] GW and the pumped storage regulation interval is [-0.6, 0.6] GW; and the flexible load regulation interval calculated by the energy consumption regulation model is [-1.16, 1.16] GW. In summary, the regulation power interval that can be provided by the flexibility resources in the region is [12.48, 31.17] GW. The greater the right endpoint value of the regulation power interval, i.e., the upper limit of the regulation power, indicates that the upward regulation capability of the power system source network load storage in the region is stronger; the smaller the left endpoint value of the regulation interval, i.e., the lower limit of the regulation power, indicates that the downward regulation capability of the power system source network load storage in the region is stronger. The regulation capabilities of various types of flexibility resources are as follows Figure 6 .

[0200] The regulation capabilities of various types of flexibility resources of the power system source network load storage are summarized to obtain the regulation power interval, and the regulation power interval is compared with the residual load interval. The envelope condition of the regulation power interval to the residual load interval is as follows Figure 7 It can be seen from the figure that the regulation power interval can basically form an envelope for the residual load interval, 31.17>26.68, i.e., the upper limit of the regulation power is greater than the upper limit of the residual load, and the upward regulation space of the power system source network load storage is sufficient, but 12.48<12.52, i.e., the lower limit of the regulation power is slightly smaller than the lower limit of the residual load, and the downward regulation space of the power system source network load storage is tight.

[0201] In general, the safety and reliability of a power system can be evaluated by adjusting the relationship between the upper limit of regulation power and the upper limit of residual load. If the upper limit of regulation power can exceed the upper limit of residual load by 10%, it can be considered that the power system has strong safety and reliability, because such regulation capacity can effectively deal with the fluctuation of load and ensure the stability of power supply. In this example, a regional power system is analyzed, and the upper limit of residual load of the regional power system is 26.68GW. In order to ensure the safety and reliability of the power system, the upper limit of regulation power needs to reach 29.35GW. By comparison, it is found that the upper limit of regulation power of the source, network, load and storage flexibility resources in the regional power system is 31.17GW, which has exceeded the actual regulation demand. From this data, the regional power system has sufficient capacity to support peak load demand, so there is no power supply risk. This safety and reliability is mainly due to the sufficient coal-fired units in the region. These coal-fired units play a key role in the power system, and their contribution to the upper limit of regulation power accounts for 92.68%. This fully illustrates the important role of coal-fired units in power supply, and under the cooperation of flexible load, energy storage units and other flexibility resources, the regional power system has strong regulation capacity and safety guarantee when dealing with peak load.

[0202] In addition, the power system also pays great attention to the consumption of wind power and photovoltaic power and other new energy, reduces resource waste, improves clean energy utilization efficiency, and reduces carbon emissions of the power system. The consumption capacity of new energy of the power system is evaluated by the relationship between the lower limit of regulation power and the lower limit of residual load. If the lower limit of regulation power is lower than 5% of the lower limit of residual load, it can be considered that the power system has sufficient new energy consumption capacity. In this example, the lower limit of residual load of the regional power system is 12.52GW, and in order to reduce the problem of wind and light abandonment, the lower limit of regulation power should not exceed 11.89GW. By comparison, it is found that the lower limit of regulation power of the source, network, load and storage flexibility resources in the regional power system is 12.48GW, which is slightly higher than the given reference value 11.89GW. This means that when the power of new energy fluctuates greatly, the system may face certain risk of wind and light abandonment, Figure 8 The size of the yellow area represents the size of the wind and light abandonment risk. According to the actual situation, the wind power utilization rate of the region in 2023 is only 93.2%, and the photovoltaic utilization rate is only 96.6%. This further verifies the accuracy of the evaluation model.

[0203] (2) Evaluate the climbing ability of the source, network, load and storage of the regional power system

[0204] Reference Figure 5At 16:00, compared with 15:00, the total system load of the power system surged, the wind power output and the photovoltaic output decreased at the same time, the power system generated a large climbing demand, and various flexible resources needed to increase the output to meet the load demand. At 16:00, the maximum climbing demand of the remaining load was about 5GW.

[0205] It can be calculated from the flexible resource regulation model that the nominal climbing upper limit of the coal-fired generating unit is 9.63GW. The nominal climbing upper limit of the gas-fired generating unit is 0.02GW. The nominal climbing upper limit of the hydropower unit is 0.13GW. The nominal climbing upper limit of the electrochemical energy storage unit is 0.11GW. The nominal climbing upper limit of the pumped storage unit is 0.3GW. The nominal climbing upper limit of the flexible load is 0.58GW. In summary, the maximum climbing power that can be provided by the flexible resources in this region is 10.77GW.

[0206] The current climbing capacity of the flexible resources is more than twice the system climbing demand, and there is enough climbing flexibility to cope with the load and new energy fluctuations of the power system. It needs to be noted that when the installed capacity of wind turbines and photovoltaic units further increases, it will bring more climbing demand. The coal-fired generating units can be flexibly modified to increase the climbing capacity of the power system.

[0207] In summary, the flexibility characteristics of the source, network, load and storage of the regional power system are as follows: in the regulation range, the upper limit of the regulation power exceeds the actual regulation demand, indicating that it has strong safety and reliability, can effectively cope with the fluctuations of the load, and can ensure the stability of the power supply. However, the lower limit of the regulation power is slightly higher than the given reference value, and there is pressure on new energy consumption, especially when the wind power output and photovoltaic output fluctuate greatly, there may be a phenomenon of wind curtailment and light curtailment. In terms of climbing power, it has sufficient climbing capacity and can cope with the fluctuations of the load and new energy. In view of the above situation, in order to realize cleaner and more efficient energy utilization, it is necessary to further optimize the configuration of flexible resources, improve the consumption capacity of new energy, and expand the lower limit of the regulation power. The following are some solutions that can be taken:

[0208] Solution 1: Stimulate the response potential of flexible load, and increase the demand response capacity from 3% of the maximum electricity load (total system load) to 4%.

[0209] Solution 2: Improve the charging capacity of the energy storage unit, increase the layout scale of the energy storage unit, and increase 1GW.

[0210] Solution 3: Flexible modification of coal-fired generating units, the scale of the modification is 20% of the installed capacity.

[0211] Solution 4: Comprehensive use of the above three solutions, from stimulating flexible load, promoting energy storage layout, and implementing flexible modification, to comprehensively improve the regulation capacity of the power system.

[0212] The regulation power interval of different flexible resources is shown as Figure 8 As can be seen from the figure, stimulating flexible load, promoting energy storage layout, and implementing flexible transformation all expand the lower limit of regulation power and increase the accommodation capacity of the power system for wind power and photovoltaic power, but the effects are different. After scheme 1 continues to tap the potential of flexible load response, the downward regulation capacity is obviously increased, but there is still a small amount of risk of wind power and photovoltaic power curtailment. After scheme 2 increases the size of the energy storage layout, wind power and photovoltaic power are stored, and there is almost no risk of wind power and photovoltaic power curtailment, so the downward regulation capacity of the system is significantly improved. After scheme 3 implements flexible transformation of coal-fired power, the lower limit of regulation power is greatly expanded, and full accommodation of wind power and photovoltaic power can be realized. After scheme 4 takes the above three measures at the same time, the power system reaches the maximum regulation power interval, and the abundant flexibility increases the safety and reliability of the system, reduces the operation risk, and can carry more wind power and photovoltaic power, which is conducive to the rapid development of wind power and photovoltaic power.

[0213] The analysis of the region shows that the existing flexible resources can basically meet the regulation demand of the power system, but there is still a certain risk of wind power and photovoltaic power curtailment. Research shows that by stimulating flexible load, promoting energy storage layout, and implementing flexible transformation, the regulation capacity of the power system can be significantly improved, and the accommodation space of renewable energy can be expanded. However, different technical schemes have different effects in the process of improving the regulation capacity, and the flexible transformation of coal-fired power is the most significant. With the continuous increase of new energy penetration rate, it is inevitable to enhance the flexibility of the system. In the short term, it is recommended to improve the regulation capacity of the system through flexible transformation of coal-fired power units; in the long term, large-scale deployment of energy storage facilities should be used to ensure the flexibility of the system. Through these measures, the sustainable development of the power system can be effectively promoted, and the efficient use of clean energy can be realized.

[0214] The embodiment also provides a device for realizing the power system source network load storage flexible resource regulation capacity evaluation method, which comprises a modeling unit, a calculation unit and an evaluation unit;

[0215] The modeling unit comprises:

[0216] The modeling unit is used for obtaining the operation parameters, variable coefficients, system total load, new energy output and nuclear power base load of the power system source network load storage;

[0217] The modeling unit is used for constructing a flexible resource regulation model according to the operation parameters;

[0218] The calculation unit comprises:

[0219] The calculation unit is used for obtaining the lower limit of the remaining load and the upper limit of the remaining load according to the system total load, the variable coefficients, the new energy output, the nuclear power base load and the upper limit of the power transmission line power;

[0220] obtaining a remaining load interval and a maximum ramping demand according to a remaining load lower limit and a remaining load upper limit;

[0221] obtaining an adjustment power upper limit according to a variable coefficient, an output power upper limit, a maximum transferable load, a maximum interruptible load and a discharge power upper limit; obtaining an adjustment power lower limit according to a variable coefficient, an output power lower limit, a maximum transferable load and a charge power upper limit;

[0222] obtaining an adjustment power interval according to the adjustment power upper limit and the adjustment power lower limit;

[0223] obtaining a maximum ramping power according to a variable coefficient, an output power upper limit, a nominal ramping upper limit and a discharge power upper limit;

[0224] an evaluation unit:

[0225] evaluating a power adjustment capability of the power system source network load storage by comparing the remaining load interval and the adjustment power interval;

[0226] evaluating a ramping capability of the power system source network load storage by comparing the maximum ramping demand and the maximum ramping power.

[0227] Finally, it should be noted that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application. Simple modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A method for evaluating the flexibility resource regulation capability of power system source, grid, load and storage, characterized in that: The following steps are involved: Obtain the operating parameters of the power system's source, grid, load, and storage, variable coefficient, total system load, renewable energy output, and nuclear power base load; Constructing a flexibility resource regulation model according to the operating parameters, the flexibility resource regulation model includes an energy production regulation model, an energy transmission network regulation model, an energy consumption regulation model, and an energy storage regulation model; the energy production regulation model includes an output power lower limit, an output power upper limit, and a nominal ramp upper limit; The energy transmission network regulation model includes a power limit for transmission lines; the energy consumption regulation model includes a maximum transfer amount of transferable loads and a maximum reduction amount of interruptible loads; the energy storage regulation model includes a charging power limit and a discharging power limit; Obtaining a residual load lower limit and a residual load upper limit according to the total system load, the variable coefficient, the renewable energy output, the nuclear power base load, and the transmission line power upper limit; Obtaining a residual load range and a maximum climbing requirement according to the residual load lower limit and the residual load upper limit; The variable coefficients include at least the fluctuation deviation of wind power output, the fluctuation deviation of photovoltaic output, the upward adjustment credibility coefficient, the downward adjustment credibility coefficient and the climbing credibility coefficient; The remaining load range is ; ， ； Where, for t The lower limit of the residual load at the moment, for t The upper limit of the remaining load at the moment, is the fluctuation deviation of wind power output, is the fluctuation deviation of photovoltaic output, for t The total system load at the moment, for t Wind power output at all times, for t Photovoltaic output at all times, for t The nuclear power base load at the moment, for t Total power of the transmission line at any moment, is the transmission line number, is the total number of transmission lines; The maximum climbing requirement is: ； Where, is the maximum climbing requirement, max is the maximum value function, for( t -1) The lower limit of the residual load at the moment; Obtaining an adjustment power upper limit according to the upward adjustment credibility coefficient, the output power upper limit, the maximum transfer amount of the transferable load, the maximum reduction amount of the interruptible load, and the discharge power upper limit; Obtaining an adjustment power lower limit according to the downward adjustment credibility coefficient, the output power lower limit, the maximum transfer amount of the transferable load, and the charging power upper limit; Obtaining an adjustment power range according to the adjustment power upper limit and the adjustment power lower limit; The adjustment power range is ; ， ； Where, To adjust the power limit, Adjust the credibility factor upward for coal-fired power units. For the i The output power limit of Taiwan's coal-fired power units, i is the serial number of the coal-fired power unit, I is the total number of coal-fired power units, For the j The output power limit of the flexible transformation coal-fired power units, j To flexibly transform the coal-fired power unit number, J To improve the total number of coal-fired power units for flexibility transformation, Adjust the reliability factor upward for the gas generator set. For the m The upper limit of the output power of the gas turbine unit, m is the gas generator unit serial number, M is the total number of gas-fired generator sets, Adjust the credibility factor upward for the hydropower unit, For the k The upper limit of the output power of the hydropower unit is k is the gas generator unit serial number, K is the total number of gas-fired generator sets, Adjust the credibility factor upward for transferable loads, is the maximum transfer amount of transferable load, Adjust the credibility factor upward for interruptible loads, is the maximum interruptible load reduction, Adjust the reliability factor upward for the energy storage unit. is the upper limit of discharge power, To adjust the power lower limit, Adjust the credibility factor downward for coal-fired power units. For the i The lower limit of output power of coal-fired power units in Taiwan, For the j The lower limit of output power of flexible transformation coal-fired power units, Adjust the credibility factor downward for the gas generator set. For the m The lower limit of the output power of the gas turbine unit, Adjust the credibility factor downward for the hydropower unit. For the k The lower limit of the output power of the hydropower unit, Adjust the credibility factor downward for transferable load, Adjust the reliability factor downward for the energy storage unit. The upper limit of charging power; The maximum climbing power is obtained according to the climbing credibility coefficient, the output power upper limit, the nominal climbing upper limit and the discharge power upper limit; the maximum climbing power is: ； Where, is the maximum climbing power, is the reliability coefficient of coal-fired power unit climbing, For the i The nominal climbing limit of Taiwan coal-fired power units, For the j The nominal ramp limit of the flexible modified coal-fired power unit is is the climbing reliability coefficient of the gas generator set, is the climbing reliability coefficient of the hydropower unit, is the climbing reliability coefficient of the energy storage unit; Comparing the remaining load interval with the regulated power interval to evaluate the power regulation capability of the power system source, grid, load and storage; When the remaining load interval is within the adjustment power interval, the power of the power system source, grid, load and storage can be adjusted; Comparing the maximum ramp demand and the maximum ramp power to evaluate the ramp capability of the power system source, grid, load and storage: When the maximum climbing power is not lower than the maximum climbing demand, the power system source, grid, load and storage have climbing flexibility.

2. The method for evaluating the flexibility resource regulation capability of a power system source, grid, load and storage according to claim 1 is characterized in that: The evaluation of the power regulation capability of the power system source, grid, load and storage includes: When the lower limit of the remaining load is lower than the lower limit of the regulated power, the power downward regulation space of the power source, grid, load and storage of the power system is in short supply; When the upper limit of the remaining load is higher than the upper limit of the regulated power, the power upward regulation space of the power system source, grid, load and storage is limited.

3. The method for evaluating the flexibility resource regulation capability of a power system source, grid, load and storage according to claim 2 is characterized in that: The upper limit of the regulated power is 10% higher than the upper limit of the residual load, and the lower limit of the regulated power is 5% lower than the lower limit of the residual load.

4. The method for evaluating the flexibility resource regulation capability of a power system source, grid, load and storage according to claim 1, characterized in that: The maximum climbing power is more than twice the maximum climbing requirement.

5. The method for evaluating the flexibility resource regulation capability of a power system source, grid, load and storage according to claim 1 is characterized in that: The operating parameters include operating status, rated capacity, minimum output percentage, maximum output percentage, landslide limit percentage, climbing limit percentage, minimum continuous operating time, minimum continuous shutdown time and typical daily power distribution; The energy production regulation model includes a first coal-fired power regulation model, a second coal-fired power regulation model, a gas-fired power regulation model and a hydropower regulation model; The first coal-fired power regulation model, the second coal-fired power regulation model and the gas-fired power regulation model all include output power constraints, ramp constraints and operating state constraints; The hydropower regulation model includes output power constraints and total output power constraints; Obtaining the output power lower limit according to the operating state, the rated capacity, and the minimum output percentage; Obtaining the output power upper limit according to the operating state, the rated capacity, and the maximum output percentage; Obtaining a nominal landslide upper limit according to the landslide limit percentage and the rated capacity; Obtaining the nominal climbing upper limit according to the climbing limit percentage and the rated capacity; Obtaining the output power constraint according to the output power lower limit and the output power upper limit; Obtaining the total output power constraint according to the output power constraint and the typical daily allocated power; Obtaining the climbing constraint according to the nominal landslide upper limit and the nominal climbing upper limit; The operating state constraint is obtained according to the operating state, the minimum continuous operating time and the minimum continuous shutdown time.

6. The method for evaluating the flexibility resource regulation capability of power system source, grid, load and storage according to claim 5 is characterized in that: The energy transmission network regulation model includes transmission line power constraints; Obtaining a lower power limit of the transmission line according to the rated capacity and the minimum output percentage; Obtaining the power upper limit of the transmission line according to the rated capacity and the maximum output percentage; The transmission line power constraint is obtained according to the transmission line power lower limit and the transmission line power upper limit.

7. The method for evaluating the flexibility resource regulation capability of a power system including source, grid, load and storage according to claim 5, wherein: The operating parameters also include the maximum transfer ratio of transferable load and the maximum reduction ratio of interruptible load; The energy consumption regulation model includes a transferable flexible load model and an interruptible flexible load model; The transferable flexible load model includes a transferable load total amount constraint and a transferable load transfer amount constraint; the interruptible flexible load model includes an interruptible load reduction amount constraint; the transferable load transfer amount constraint includes a transferable load transfer-in amount constraint and a transferable load transfer-out amount constraint; Obtaining a maximum transfer-in amount of transferable load and a maximum transfer-out amount of transferable load according to the maximum transfer ratio of the transferable load and the total load of the system; Obtaining the transferable load input amount constraint according to the maximum transferable load input amount; Obtaining the transferable load transfer-out amount constraint according to the maximum transferable load transfer-out amount; Obtaining the transferable load total amount constraint according to the transferable load inward amount constraint and the transferable load outward amount constraint; Obtaining a maximum interruptible load reduction amount according to the maximum interruptible load reduction ratio and the total system load; The interruptible load reduction amount constraint is obtained according to the interruptible load maximum reduction amount.

8. The method for evaluating the flexibility resource regulation capability of a power system including source, grid, load and storage according to claim 5, wherein: The operating parameters also include charge and discharge efficiency, minimum charge limit, maximum charge limit, minimum discharge limit, maximum discharge limit, minimum capacity limit, maximum capacity limit, charge state, and discharge state; The energy storage regulation model includes an energy storage capacity model, charging power constraints, discharging power constraints, charging and discharging state constraints, and storage capacity balance constraints; Obtaining a lower limit of charging power according to the charging state and the minimum charging limit; Obtaining a charging power upper limit according to the charging state and the maximum charging limit; Obtaining a discharge power lower limit according to the discharge state and the minimum discharge limit; Obtaining a discharge power upper limit according to the discharge state and the maximum discharge limit; Obtaining the charging power constraint according to the charging power lower limit and the charging power upper limit; Obtaining the discharge power constraint according to the discharge power lower limit and the discharge power upper limit; Obtaining the charge and discharge state constraint according to the charge state and the discharge state; Obtaining the power storage balance constraint according to the minimum capacity limit and the maximum capacity limit; The energy storage capacity model is obtained according to the charging and discharging efficiency, the charging power constraint, the discharging power constraint and the capacity balance constraint.

9. A device for implementing the method for evaluating the flexibility resource regulation capability of a power system source, grid, load and storage as described in any one of claims 1 to 8, characterized in that: It includes modeling unit, calculation unit and evaluation unit; The modeling unit: Used to obtain the operating parameters of the power system source, grid, load and storage, the variable coefficient, the total system load, the new energy output and the nuclear power base load; used to construct the flexibility resource adjustment model according to the operating parameters; The computing unit: for obtaining a lower limit and an upper limit of the residual load according to the total system load, the variable coefficient, the renewable energy output, the nuclear power base load and the upper limit of the transmission line power; for obtaining a residual load range and a maximum climbing requirement according to the residual load lower limit and the residual load upper limit; for obtaining an upper limit of regulated power according to the variable coefficient, the upper limit of output power, the maximum transfer amount of transferable load, the maximum reduction amount of interruptible load and the upper limit of discharge power; for obtaining an adjustment power lower limit according to the variable coefficient, the output power lower limit, the maximum transfer amount of the transferable load, and the charging power upper limit; Used to obtain an adjustment power range according to the adjustment power upper limit and the adjustment power lower limit; Used to obtain the maximum climbing power according to the variable coefficient, the output power upper limit, the nominal climbing upper limit and the discharge power upper limit; The evaluation unit: Used to compare the remaining load interval and the regulated power interval to evaluate the power regulation capability of the power system source, grid, load and storage; Used to compare the maximum climbing demand and the maximum climbing power to evaluate the climbing capability of the power system source, grid, load and storage.

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