Calculation method of system spinning reserve capacity considering network security and dispatchable load

Abstract

The present invention discloses a method for calculating the system rotating reserve capacity taking into account network security and dispatchable loads, comprising the following steps: Step 1, based on basic data, with the lowest power purchase cost as the optimization goal, establish a unit combination optimization calculation model; Step 2, based on the system rotating reserve demand, allocate the total reserve demand to each unit, and consider the dispatchable load to establish the positive rotating reserve and negative rotating reserve output range constraints of each unit; Step 3, incorporate the rotating reserve capacity and dispatchable load of each unit into the safety constraint calculation, and calculate the maximum spare capacity actually borne by each unit; Step 4, add the calculated rotating reserve capacity of each unit to the system rotating reserve capacity, consider the use of the dispatchable load, and accurately calculate the system spare capacity value that meets the network security constraints. This method fully considers the impact of network security constraints and dispatchable loads on spare capacity, and can accurately calculate the rotating reserve capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of power systems and automation thereof, and particularly relates to a method for calculating system spinning reserve capacity taking into account network security and dispatchable loads. Background Art

[0002] System spinning reserve capacity has always been crucial to the safe operation of power systems and a key means of ensuring the safe operation of the power grid. This is especially true when forecasts for renewable energy output are inaccurate. Properly reserving system spinning reserve capacity is crucial to the smooth and safe operation of the power system. When there is a significant gap between forecasted and actual renewable energy output, or when certain equipment is shut down due to malfunctions, operating units must increase their output to meet system balance requirements. Therefore, reserving sufficient spinning reserve capacity when formulating unit deployment plans is crucial to maintaining power supply continuity.

[0003] System spinning reserve capacity is divided into positive spinning reserve and negative spinning reserve. Without considering the actual operating conditions of the power system, the higher the proportion of spinning reserve to system load, the greater the reliability and security of the power system. However, positive spinning reserve and negative spinning reserve often exhibit an inverse relationship. Furthermore, the demand for system reserve also determines the unit lineup planning. Generally speaking, a greater demand for positive spinning reserve requires more units to be operational, which increases the operating costs of the power system.

[0004] Therefore, it is crucial to properly reserve appropriate reserve capacity when formulating unit combinations and generation plans based on the system's positive and negative spinning reserve requirements. Current methods for calculating system spinning reserve often rely on the accumulation of unit spinning reserve capacities, failing to consider the impact of network security constraints and dispatchable loads on reserve capacity. This results in calculated system reserve capacity being slightly higher than the actual available system reserve capacity, leading to misjudgments about the safety of the power system's operating status. Summary of the Invention

[0005] Purpose of the invention: The purpose of the invention is to provide a method for calculating system spinning reserve capacity taking into account network security and dispatchable load.

[0006] Technical solution: The present invention provides a method for calculating system spinning reserve capacity taking into account network security and dispatchable loads, the method comprising the following steps:

[0007] (1) Based on the input basic data and taking the lowest power purchase cost as the optimization goal, a unit combination optimization calculation model is established;

[0008] (2) Based on the system spinning reserve demand, the total reserve demand is allocated to each unit, and considering the participation of dispatchable load, the positive spinning reserve and negative spinning reserve output range constraints of each unit are established;

[0009] (3) Incorporate the spinning reserve capacity and dispatchable load of each unit into the safety constraint calculation, and calculate the maximum spare capacity that each unit can actually bear under the condition that the safety constraints are met;

[0010] (4) The calculated spinning reserve capacity of each unit is accumulated as the system spinning reserve capacity, and the use of dispatchable load is taken into consideration to accurately calculate the system reserve capacity value that meets the network security constraints and meets the needs of safe operation of the power grid.

[0011] Preferably, the basic data in step (1) include the maximum output of the unit, the minimum output of the unit, the climbing rate of the unit, the sliding rate of the unit, the minimum continuous operation time of the unit, the minimum downtime of the unit, the initial output of the unit, the state maintenance time of the unit, the minimum positive spinning reserve demand of the system, the minimum negative spinning reserve demand of the system, the critical section limit and the sensitivity to the equipment; if there is a dispatchable load in the system, the basic data also includes the maximum output of the dispatchable load, the minimum output of the dispatchable load, the climbing rate of the dispatchable load, the sliding rate of the dispatchable load, the minimum power requirement of the dispatchable load, and the maximum power requirement of the dispatchable load.

[0012] Preferably, the variables unit positive spinning reserve and unit negative spinning reserve are introduced into the unit commitment optimization model established in step (1).

[0013] Preferably, in step (2), when the unit is a fixed output unit, the variable unit positive spinning reserve and the unit negative spinning reserve are set to fixed values, which are used as constants and do not participate in the calculation of the unit spinning reserve output range constraint. At this time, the calculation method of the variable unit positive spinning reserve and the unit negative spinning reserve is as follows:

[0014]

[0015] Where UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t.

[0016] Preferably, in step (2), when the unit is a non-fixed output unit, the size range of the variable unit positive spinning reserve and the unit negative spinning reserve meets the following constraints:

[0017]

[0018] Where UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t.

[0019] At the same time, the lower limit constraint of the system spinning reserve is met. The constraints are as follows:

[0020]

[0021] Where SystemPosRsv(t) is the minimum positive spinning reserve lower limit of the system at time t, and SystemNegRsv(t) is the minimum negative spinning reserve lower limit of the system at time t, which are converted proportionally according to the system load level.

[0022] Preferably, the calculation method for the positive spinning reserve and the negative spinning reserve of the unit in step (3) to satisfy the network security constraint is as follows:

[0023]

[0024] Where, Sens(nfg,i,t) is the sensitivity of the key section nfg to unit i at time t, Sens(nfg,l,t) is the sensitivity of the key section nfg to the bus load l at time t, Sens(nfg,tie,t) is the sensitivity of the key section nfg to the tie line tie at time t, SectionLimit(nfg,i) is the dynamic limit of the key section nfg at time t, Pi(i,t) is the output of unit i at time t, Load(l,t) is the load of bus l at time t, and Tieline(tie,t) is the planned power of tie line tie at time t.

[0025] The dispatchable load meets the output limit constraint, ramping capability constraint, power constraint and fixed output constraint. The dispatchable load participates in the operation of the power system. The power system generation and consumption balance calculation method is as follows:

[0026]

[0027] Where SystemLoad(t) is the predicted value of the system load at time t, UIL(ild,t) is a flag indicating whether the dispatchable load ild is cut off at time t, UIL(ild,t) = 1 means that the dispatchable load ild is cut off at time t, and UIL(ild,t) = 0 means that the dispatchable load ild is not cut off at time t;

[0028] Incorporate dispatchable load into the calculation of system reserve capacity and formulate unit combination plan.

[0029] Preferably, in step (4), the dispatchable load is regarded as a system reserve capacity, the dispatchable load that has not been removed is regarded as part of the system positive spinning reserve capacity, and the dispatchable load that has been removed is regarded as part of the system negative spinning reserve capacity. When calculating the system spinning reserve, the dispatchable load is taken into consideration, and the calculation method is as follows:

[0030]

[0031] The dispatchable loads participating in the grid operation meet the network security constraints. The calculation method is as follows:

[0032]

[0033] Where Sens(nfg,ild,t) is the power transfer factor of unit i to section nfg at time t; ILoad(ild,t) is the planned power of dispatchable load ild at time t.

[0034] Preferably, after the start and stop conditions of the units are determined through unit combination optimization calculation, a new optimization target is added to calculate the maximum positive spinning reserve capacity of the system or the maximum negative spinning reserve capacity of the system. The new optimization target is as follows:

[0035]

[0036] Preferably, after the unit combination optimization calculation is performed and the start and stop conditions of the units are determined, an optimization goal of minimizing the system standby cost is added, and the system standby capacity unit allocation result is calculated. The optimization goal of minimizing the system standby cost is as follows:

[0037]

[0038] Where UnitPosRsvPrice(i,t) is the positive spinning reserve cost of the unit, and UnitNegRsvPrice(i,t) is the negative spinning reserve cost of the unit.

[0039] Furthermore, the dispatchable loads meet the output limit constraint, ramping capability constraint, power constraint, and fixed output constraint. The specific constraints are as follows:

[0040] The output limit constraint is:

[0041] Where ILoad(ild,t) is the output of the dispatchable load, ILoadMaxPower(ild,t) is the upper limit of the output of the dispatchable load, and ILoadMinPower(ild,i) is the lower limit of the output of the dispatchable load.

[0042] The climbing ability constraint is:

[0043] Where IncRamp(ild,t) is the maximum ramping capacity of the dispatchable load ild at time t, DecRamp(i,t) is the minimum ramping capacity of the dispatchable load ild at time t, and MTime is the calculation time interval. For example, MTime = 15 for day-ahead planning and MTime = 5 for real-time planning.

[0044] The power constraint is:

[0045] Where ILoadMaxEnergy(ild) is the maximum energy requirement that the dispatchable load ild needs to meet, and ILoadMinEnergy(ild) is the minimum energy requirement that the dispatchable load ild needs to meet.

[0046] The fixed output constraint is: ILoad(ild,t)=ILoadFixedPower(ild,t)

[0047] Where ILoadFixedPower(ild,t) is the fixed output plan of the dispatchable load ild at time t.

[0048] Beneficial effects: This method fully considers the impact of network security constraints and dispatchable loads on reserve capacity. By allocating the system's rotating reserve capacity to each unit and incorporating the rotating reserve capacity borne by each unit into the calculation of network security constraints, the system's rotating reserve capacity that meets network security constraints is calculated. The calculation method is more accurate and can meet the needs of safe operation of the power grid. When dispatchable loads are involved in the power grid, while satisfying the dispatchable load operation constraints and network constraints, the adjustment capability of the dispatchable load is included in the calculation of the system's rotating reserve capacity, further improving the accuracy of the calculation of the system's rotating reserve capacity. Furthermore, by setting the optimization goal of maximizing the system's rotating reserve usage, the maximum rotating reserve capacity available to the system can be calculated to provide a reference for power grid operation. It is also possible to determine which units will bear the system's rotating reserve capacity by setting the optimization of minimizing the system's standby cost, so as to minimize the power grid operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a workflow diagram of the method for calculating system spinning reserve capacity considering network security and dispatchable load in the present invention. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0051] A method for calculating system spinning reserve capacity considering network security and dispatchable load, such as Figure 1 As shown, the method includes the following steps:

[0052] Based on the input basic data, the unit combination optimization calculation model is established with the lowest power purchase cost as the optimization goal;

[0053] Basic data should include: maximum unit output, minimum unit output, unit ramp-up rate, unit ramp-down rate, minimum unit continuous operation time, minimum unit shutdown time, unit initial output, unit status retention time, system minimum positive spinning reserve demand, system minimum negative spinning reserve demand, critical section limits, and equipment sensitivity. If there are dispatchable loads in the system, the basic data also include the maximum output of the dispatchable load, the minimum output of the dispatchable load, the ramp-up rate of the dispatchable load, the ramp-down rate of the dispatchable load, the minimum power requirement of the dispatchable load, and the maximum power requirement of the dispatchable load.

[0054] The variables unit positive spinning reserve UnitPosRsv(i,t) and unit negative spinning reserve UnitNegRsv(i,t) are introduced into the unit commitment optimization model.

[0055] Check the output status of the unit. When the unit is a fixed output unit, set the variable unit positive spinning reserve and unit negative spinning reserve values ​​to be fixed. They are used as constants and do not participate in the calculation of the unit spinning reserve output range constraint. At this time, the calculation method of the variable unit positive spinning reserve and unit negative spinning reserve is as follows:

[0056]

[0057] Where UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t.

[0058] When the unit is a non-fixed output unit, the size range of the variable unit positive spinning reserve and the unit negative spinning reserve must meet the following constraints:

[0059]

[0060] Where UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t.

[0061] At the same time, the lower limit constraint of the system spinning reserve is met. The constraints are as follows:

[0062]

[0063] Where SystemPosRsv(t) is the minimum positive spinning reserve lower limit of the system at time t, and SystemNegRsv(t) is the minimum negative spinning reserve lower limit of the system at time t, which are converted proportionally according to the system load level.

[0064] During power system operation, the output of generators is also subject to safety constraints. Overloads at certain critical sections may limit the adjustable output range of the relevant generators. The reserve capacity of a generator is essentially the margin within which the generator's output range can be adjusted. Therefore, the calculation of the positive and negative spinning reserve capacities of a generator must also meet network security constraints.

[0065] The calculation method for the positive spinning reserve and negative spinning reserve of the unit to meet the network security constraints is as follows:

[0066] Where, Sens(nfg,i,t) is the sensitivity of the key section nfg to unit i at time t, Sens(nfg,l,t) is the sensitivity of the key section nfg to the bus load l at time t, Sens(nfg,tie,t) is the sensitivity of the key section nfg to the tie line tie at time t, SectionLimit(nfg,i) is the dynamic limit of the key section nfg at time t, Pi(i,t) is the output of unit i at time t, Load(l,t) is the load of bus l at time t, and Tieline(tie,t) is the planned power of tie line tie at time t.

[0067] When there is a dispatchable load in the system, the dispatchable load can be included in the calculation of the system's spare capacity. When formulating the unit combination plan, a plan for putting the dispatchable load into use can be formulated to achieve advance notification of the use of the dispatchable load and meet actual production needs.

[0068] The dispatchable load meets the output limit constraint, ramping capability constraint, power constraint and fixed output constraint. The specific constraints are as follows:

[0069] The output limit constraint is:

[0070] Where ILoad(ild,t) is the output of the dispatchable load, ILoadMaxPower(ild,t) is the upper limit of the output of the dispatchable load, and ILoadMinPower(ild,i) is the lower limit of the output of the dispatchable load.

[0071] The climbing ability constraint is:

[0072] Where IncRamp(ild,t) is the maximum ramping capacity of the dispatchable load ild at time t, DecRamp(i,t) is the minimum ramping capacity of the dispatchable load ild at time t, and MTime is the calculation time interval. For example, MTime = 15 for day-ahead planning and MTime = 5 for real-time planning.

[0073] The power constraint is:

[0074] Where ILoadMaxEnergy(ild) is the maximum energy requirement that the dispatchable load ild needs to meet, and ILoadMinEnergy(ild) is the minimum energy requirement that the dispatchable load ild needs to meet.

[0075] The fixed output constraint is: ILoad(ild,t)=ILoadFixedPower(ild,t)

[0076] Where ILoadFixedPower(ild,t) is the fixed output plan of the dispatchable load ild at time t.

[0077] When the above constraints are met, the dispatchable load can participate in the operation of the power system. At this time, the power system's generation and consumption balance calculation method is as follows:

[0078]

[0079] Where SystemLoad(t) is the predicted value of the system load at time t, UIL(ild,t) is a flag indicating whether the dispatchable load ild is cut off at time t, UIL(ild,t) = 1 means that the dispatchable load ild is cut off at time t, and UIL(ild,t) = 0 means that the dispatchable load ild is not cut off at time t;

[0080] Dispatchable load itself is a kind of system reserve capacity. Therefore, when calculating the system spinning reserve, the participation of dispatchable load should be considered. The calculation method is as follows:

[0081]

[0082] Removing a dispatchable load will reduce the total system load. When the unit output remains unchanged, it will lead to a reduction in the system's positive spinning reserve capacity. Therefore, the dispatchable load that is not removed can be regarded as part of the system's positive spinning reserve capacity.

[0083] A dispatchable load that has been removed will only be put back into service when the unit's minimum total generating capacity exceeds the system load. In this case, the removed dispatchable load can be considered to increase the unit's ability to adjust output downward and should be included in the calculation of the system's negative spinning reserve capacity.

[0084] Similarly, the dispatchable loads participating in the grid operation should also meet network security constraints. The calculation method is as follows:

[0085]

[0086] Where, Sens(nfg,ild,t) is the power transfer factor of unit i to section nfg at time t;

[0087] ILoad(ild,t) is the planned power of the dispatchable load ild at time t.

[0088] Based on this model, after the unit combination optimization calculation and the determination of the unit start-up and shutdown conditions, the system maximum positive spinning reserve capacity or the system maximum negative spinning reserve capacity can be calculated by adding new optimization objectives. The newly added optimization objectives are as follows:

[0089]

[0090] By calculating the maximum positive spinning reserve capacity and the maximum negative reserve capacity of the system, an evaluation basis can be provided for the formulated unit combination plan.

[0091] In addition, based on this model, the parameters of the positive spinning reserve cost and negative spinning reserve cost of the unit can be added, and the optimization goal of minimizing the system reserve cost can be added to calculate the allocation results of the system reserve capacity units. The optimization goal of minimizing the system reserve cost is as follows:

[0092]

[0093] Where UnitPosRsvPrice(i,t) is the positive spinning reserve cost of the unit, and UnitNegRsvPrice(i,t) is the negative spinning reserve cost of the unit.

[0094] In summary, this method for calculating system spinning reserve capacity considering network security and dispatchable load distributes the system spinning reserve capacity to each unit and incorporates the spinning reserve capacity borne by each unit into the calculation of network security constraints, so as to accurately calculate the system spinning reserve capacity that meets network security constraints; at the same time, when there is dispatchable load in the power grid, while satisfying the dispatchable load operation constraints and network constraints, the adjustment capability of the dispatchable load is included in the calculation of the system spinning reserve capacity, further improving the accuracy of the system spinning reserve capacity calculation.

Claims

1. A method for calculating system spinning reserve capacity considering network security and dispatchable load, characterized by: The method comprises the following steps: (1) Based on the input basic data, with the lowest power purchase cost as the optimization goal, a unit combination optimization calculation model is established; the variables unit positive spinning reserve and unit negative spinning reserve are introduced into the established unit combination optimization model; (2) According to the system spinning reserve demand, the total reserve demand is allocated to each unit, and the dispatchable load is considered to establish the positive spinning reserve and negative spinning reserve output range constraints of each unit; when the unit is a fixed output unit, the variable unit positive spinning reserve and unit negative spinning reserve values ​​are set to be fixed and are not involved in the calculation of the unit spinning reserve output range constraints as constants. At this time, the calculation method of the variable unit positive spinning reserve and unit negative spinning reserve is as follows: Where, UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t; When the unit is a non-fixed output unit, the size range of the variable unit positive spinning reserve and the unit negative spinning reserve must meet the following constraints: Where, UnitPosRsv(i,t) is the positive spinning reserve of unit i at time t, UnitNegRsv(i,t) is the negative spinning reserve of unit i at time t, Pi(i,t) is the output of unit i at time t, Unit_MaxPower(i,t) is the upper limit of the maximum output of unit i at time t, Unit_MinPower(i,t) is the lower limit of the minimum output of unit i at time t, Ui(i,t) is the start and stop flag of the unit, Ui(i,t)=1 indicates that unit i is started at time t, and Ui(i,t)=0 indicates that unit i is stopped at time t; At the same time, the lower limit constraint of the system spinning reserve is met. The constraints are as follows: Where SystemPosRsv(t) is the minimum positive spinning reserve lower limit of the system at time t, and SystemNegRsv(t) is the minimum negative spinning reserve lower limit of the system at time t, which are converted proportionally according to the system load level; (3) The spinning reserve capacity and dispatchable load of each unit are included in the safety constraint calculation. Under the condition of satisfying the safety constraints, the maximum spare capacity that each unit can actually bear is calculated. The calculation method of the positive spinning reserve and negative spinning reserve of the unit to meet the network security constraints is as follows: Where, Sens(nfg,i,t) is the sensitivity of the key section nfg to unit i at time t, Sens(nfg,l,t) is the sensitivity of the key section nfg to the bus load l at time t, Sens(nfg,tie,t) is the sensitivity of the key section nfg to the tie line tie at time t, SectionLimit(nfg,i) is the dynamic limit of the key section nfg at time t, Pi(i,t) is the output of unit i at time t, Load(l,t) is the load of bus l at time t, and Tieline(tie,t) is the planned power of tie line tie at time t. The dispatchable load meets the output limit constraint, ramping capability constraint, power constraint and fixed output constraint. The dispatchable load participates in the operation of the power system. The power system generation and consumption balance calculation method is as follows: Where SystemLoad(t) is the predicted value of the system load at time t, UIL(ild,t) is a flag indicating whether the dispatchable load ild is cut off at time t, UIL(ild,t) = 1 means that the dispatchable load ild is cut off at time t, and UIL(ild,t) = 0 means that the dispatchable load ild is not cut off at time t; Incorporate dispatchable load into the calculation of system reserve capacity and formulate unit combination plans; (4) The calculated spinning reserve capacity of each unit is accumulated as the system spinning reserve capacity, and the use of dispatchable load is taken into consideration to accurately calculate the system reserve capacity value that meets the network security constraints and meets the needs of safe operation of the power grid; The dispatchable load is regarded as a kind of system reserve capacity, the dispatchable load that has not been removed is regarded as part of the system's positive spinning reserve capacity, and the dispatchable load that has been removed is regarded as part of the system's negative spinning reserve capacity. The dispatchable load is taken into account when calculating the system's spinning reserve. The calculation method is as follows: The dispatchable loads participating in the grid operation meet the network security constraints. The calculation method is as follows: Where Sens(nfg,ild,t) is the power transfer factor of unit i to section nfg at time t; ILoad(ild,t) is the planned power of dispatchable load ild at time t; After the unit combination optimization calculation is completed and the start and stop conditions of the units are determined, a new optimization target is added to calculate the system's maximum positive spinning reserve capacity or the system's maximum negative spinning reserve capacity. The new optimization target is as follows: After the unit combination optimization calculation is performed and the start and stop conditions of the units are determined, the optimization goal of minimizing the system standby cost is added, and the allocation results of the system standby capacity units are calculated. The optimization goal of minimizing the system standby cost is as follows: Where UnitPosRsvPrice(i,t) is the positive spinning reserve cost of the unit, and UnitNegRsvPrice(i,t) is the negative spinning reserve cost of the unit.

2. The method for calculating system spinning reserve capacity considering network security and dispatchable load according to claim 1, characterized in that: The basic data in step (1) include the maximum output of the unit, the minimum output of the unit, the climbing rate of the unit, the sliding rate of the unit, the minimum continuous operation time of the unit, the minimum downtime of the unit, the initial output of the unit, the state retention time of the unit, the minimum positive spinning reserve demand of the system, the minimum negative spinning reserve demand of the system, the critical section limit and the sensitivity to the equipment; if there is a dispatchable load in the system, the basic data also includes the maximum output of the dispatchable load, the minimum output of the dispatchable load, the climbing rate of the dispatchable load, the sliding rate of the dispatchable load, the minimum power requirement of the dispatchable load, and the maximum power requirement of the dispatchable load.

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