Flexible ramp capacity optimization method and related device for high-proportion new energy power grid

Abstract

The present invention belongs to the field of electric power automation, and discloses a flexible climbing capacity optimization method and related devices for a high-proportion new energy power grid, including determining the climbing requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault, and local power grid decoupling, and on this basis, incorporating new energy units into the main body of climbing auxiliary service providers to construct the local power grid climbing capacity constraints; at the same time, based on the planned power of the tie line between the local power grids, the climbing auxiliary service callability constraints are constructed; finally, based on the total load of each local power grid in the power grid, the sum of the output cost, the frequency regulation cost, and the climbing insufficient penalty cost is minimized as the optimization target, and the optimization result is obtained according to the local power grid climbing capacity constraints and the climbing auxiliary service callability constraints, combined with the remaining related constraints. Sufficient climbing margin can be reserved, the flexibility of the power grid can be enhanced to adapt to the access of a high proportion of new energy, and the stable operation of the power grid can be ensured.

Description

Technical Field

[0001] The present invention belongs to the field of electric power automation and relates to a flexible ramp capacity optimization method for a high-proportion new energy power grid and a related device. Background Art

[0002] The high penetration rate of renewable energy in local power grids has become a significant feature of the development of new power systems. However, the short-term volatility and strong randomness of renewable energy output have greatly increased the grid's demand for flexible and adjustable resources. This uncertainty not only requires the grid to be equipped with sufficient flexible ramping regulation resources to quickly respond to output changes, but also the unpredictability of renewable energy output makes the grid balance point unstable and difficult to grasp, which requires additional sufficient ramping capacity to ensure the stable operation of the grid.

[0003] Although the ramping auxiliary service market is gradually being built, it is still in the early stages of development. At present, traditional flexibility resource auxiliary services, such as frequency regulation, standby and peak-shaving services, mainly focus on the regulation ability of units near the base load rate, but fail to fully cover the contribution of flexible ramping of units above the base load rate following load peaks and valleys. A particularly prominent problem is that there is currently a lack of systematic in-depth analysis and evaluation of the callability of ramping auxiliary services in actual multi-regional power grids. This situation limits the efficient and accurate dispatch of ramping resources, hinders the further development of the power system, and exacerbates the problem of insufficient flexibility and callability of ramping auxiliary services in power grids with a high proportion of new energy. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a flexible ramp capacity optimization method and related devices for a high-proportion new energy power grid.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a flexible climbing capacity optimization method for a high-proportion new energy power grid, comprising: determining the climbing requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; wherein N is the number of components in the local power grid; incorporating new energy units into the main body of climbing auxiliary service providers, and constructing local power grid climbing capacity constraints according to the climbing requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; constructing climbing auxiliary service callability constraints based on the planned power of the interconnection line between the local power grids; based on the total load of each local power grid in the power grid, taking the minimum sum of the output cost, the frequency regulation cost and the climbing deficiency penalty cost as the optimization target, according to the local power grid climbing capacity constraints and the climbing auxiliary service callability constraints, combined with the power grid power balance constraints, the conventional unit output constraints, the conventional unit climbing capacity constraints, the local power grid frequency regulation capacity constraints, the interconnection line transmission power constraints, the new energy unit climbing capacity constraints and the new energy unit climbing capacity constraints, optimization is performed to obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

[0007] Optionally, determining the ramp requirements of each local power grid in the power grid under the condition of a new energy output error, a local power grid N-1 fault, and a local power grid disconnection includes:

[0008] The ramp requirements of each local power grid under the condition of renewable energy output error are determined by the following formula:

[0009]

[0010]

[0011] in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z time t New energy output at +1; For local power grid z time t The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time.

[0012] The ramping requirements of each local grid in the event of a local grid N-1 fault are determined by the following formula:

[0013]

[0014] in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power.

[0015] When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0016]

[0017] in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z time t Time contact line l Planned power of the tie line.

[0018] When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0019]

[0020] in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

[0021] Optionally, the incorporation of new energy units into the main body of providing ramp-up auxiliary services, and the construction of local grid ramp-up capacity constraints according to the ramp-up requirements of each local grid in the grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling include:

[0022] Construct the following local power grid ramp capacity constraint:

[0023]

[0024]

[0025]

[0026]

[0027]

[0028] in, For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

[0029] Optionally, the constructing of the callability constraint of the ramp assistance service based on the planned power of the tie lines between the local power grids includes:

[0030] Construct the following callability constraint for the hill climbing assistance service:

[0031]

[0032]

[0033] in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional units i timet The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For conventional units i time t Frequency modulation capacity requirements; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

[0034] Optionally, the optimization objective is to minimize the sum of the output cost, the frequency regulation cost and the penalty cost for insufficient climbing. According to the local power grid climbing capacity constraint and the callability constraint of the climbing auxiliary service, the optimization is performed in combination with the power grid power balance constraint, the output constraint of the conventional unit, the climbing capacity constraint of the conventional unit, the frequency regulation capacity constraint of the local power grid, the transmission power constraint of the interconnection line, the climbing capacity constraint of the new energy unit and the climbing capacity constraint of the new energy unit. By constructing the optimization objective function of the following formula: To optimize:

[0035]

[0036] in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i Unit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t FM capacity; For local power grid z The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z time t Insufficient downhill climbing capacity.

[0037] Optionally, the power grid power balance constraint is:

[0038]

[0039] in, Pz,d For local power grid z time t Total load; For local power grid z Conventional unit set; For conventional units i At the moment t contribution; For new energy units j time t 's planned contribution; For local power grid z A set of new energy units.

[0040] The output constraints of conventional units are:

[0041]

[0042]

[0043] in, For conventional units i time t The climbing capacity provided; For conventional units i At the moment t FM capacity; For conventional units i time t The downhill climbing capacity provided; For conventional units i Output limit; For conventional units i The lower output limit.

[0044] The climbing capability constraint of conventional units is:

[0045]

[0046]

[0047] in, For conventional units i The upper limit of climbing ability; For conventional units i The lower limit of climbing ability.

[0048] The frequency regulation capacity constraint of the local power grid is:

[0049]

[0050] in, For local power grid z time t frequency modulation capacity requirements.

[0051] The transmission power constraint of the tie line is:

[0052]

[0053] in, For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of section power.

[0054] The climbing capability constraint of new energy units is:

[0055]

[0056] in, For new energy units j time t The climbing capacity provided; For new energy units j time t The forecast output.

[0057] The ramp capacity constraint of new energy units is:

[0058]

[0059]

[0060]

[0061] in, For new energy units j time t The downhill climbing capacity provided; For new energy units j time t +1 predicted output; For new energy units j time t climbing ability.

[0062] In a second aspect, the present invention provides a flexible climbing capacity optimization system for a high-proportion new energy power grid, including: a demand determination module, used to determine the climbing demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; a climbing capacity constraint construction module, used to incorporate new energy units into the main body of climbing auxiliary service providers, and construct local power grid climbing capacity constraints according to the climbing demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; an invokability constraint construction module, used to The planned power of the interconnection lines between the power grids is constructed to build the callability constraints of the climbing auxiliary service; the optimization module is used to optimize the total load of each local power grid in the power grid, with the minimum sum of the output cost, frequency regulation cost and the penalty cost for insufficient climbing as the optimization target, according to the climbing capacity constraints of the local power grid and the callability constraints of the climbing auxiliary service, combined with the power balance constraints of the power grid, the output constraints of conventional units, the climbing capacity constraints of conventional units, the frequency regulation capacity constraints of the local power grid, the transmission power constraints of the interconnection lines, the climbing capacity constraints of new energy units and the climbing capacity constraints of new energy units, to obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

[0063] Optionally, determining the ramp requirements of each local power grid in the power grid under the condition of a new energy output error, a local power grid N-1 fault, and a local power grid disconnection includes:

[0064] The ramp requirements of each local power grid under the condition of renewable energy output error are determined by the following formula:

[0065]

[0066]

[0067] in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z timet New energy output at +1; For local power grid z time t The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time.

[0068] The ramping requirements of each local grid in the event of a local grid N-1 fault are determined by the following formula:

[0069]

[0070] in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power.

[0071] When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0072]

[0073] in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z time t Time contact line l Planned power of the tie line.

[0074] When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0075]

[0076] in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

[0077] Optionally, the incorporation of new energy units into the main body of providing ramp-up auxiliary services, and the construction of local grid ramp-up capacity constraints according to the ramp-up requirements of each local grid in the grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling include:

[0078] Construct the following local power grid ramp capacity constraint:

[0079]

[0080]

[0081]

[0082]

[0083]

[0084] in, For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

[0085] Optionally, the constructing of the callability constraint of the ramp assistance service based on the planned power of the tie lines between the local power grids includes:

[0086] Construct the following callability constraint for the hill climbing assistance service:

[0087]

[0088]

[0089] in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For conventional units i Moment t Frequency modulation capacity requirements; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

[0090] Optionally, the optimization objective is to minimize the sum of the output cost, the frequency regulation cost and the penalty cost for insufficient climbing. According to the local power grid climbing capacity constraint and the callability constraint of the climbing auxiliary service, the optimization is performed in combination with the power grid power balance constraint, the output constraint of the conventional unit, the climbing capacity constraint of the conventional unit, the frequency regulation capacity constraint of the local power grid, the transmission power constraint of the interconnection line, the climbing capacity constraint of the new energy unit and the climbing capacity constraint of the new energy unit. By constructing the optimization objective function of the following formula: To optimize:

[0091]

[0092] in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i Unit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t FM capacity; For local power grid z The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z Moment t Insufficient downhill climbing capacity.

[0093] According to a third aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for optimizing the flexible ramping capacity of a high-proportion new energy power grid when executing the computer program.

[0094] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the flexible ramping capacity optimization method for a high-proportion new energy power grid are implemented.

[0095] Compared with the prior art, the present invention has the following beneficial effects:

[0096] The flexible climbing capacity optimization method of the high-proportion new energy power grid of the present invention is based on the regional optimization concept, fully considering the climbing requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling, and on this basis, the new energy units are included in the climbing auxiliary service provider to construct the local power grid climbing capacity constraint, and the flexibility of the local power grid is supported by increasing the climbing capacity of the new energy units, thereby realizing the reasonable determination of the climbing capacity of each local power grid, which can effectively ensure that the high-proportion new energy power grid has sufficient flexibility and stability. At the same time, based on the planned power of the interconnection line between the local power grids, the climbing auxiliary service callability constraint is constructed, which can ensure that on the basis of the planned power of the interconnection line, there is sufficient climbing capacity between the local power grids to cope with possible load fluctuations and new energy output changes, ensuring the callability of the climbing auxiliary service, promoting the consumption and utilization of new energy, and improving the safety of power grid operation as a whole. Then, based on the total load of each local power grid within the power grid, optimization is performed with the minimum sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization goal. By introducing the insufficient climbing penalty cost, new energy units are encouraged to actively participate in power grid regulation, which effectively reduces the overall cost of power grid operation and reserves sufficient climbing margin for each local power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 This is a flow chart of a flexible ramp capacity optimization method for a high-proportion new energy power grid according to an embodiment of the present invention.

[0098] Figure 2 This is a schematic diagram of the principle of a new energy unit participating in a hill climbing auxiliary service according to an embodiment of the present invention.

[0099] Figure 3 This is a block diagram of the flexible ramp capacity optimization system for a high-proportion new energy power grid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0100] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0101] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0102] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0103] See also Figure 1 In one embodiment of the present invention, a flexible ramp capacity optimization method for a power grid with a high proportion of new energy is provided, which can reserve sufficient ramp margin for each local power grid in the power grid, enhance the flexibility of the power grid to adapt to the access of a high proportion of new energy, and has significant application prospects.

[0104] Specifically, the flexible ramp capacity optimization method of a high-proportion new energy power grid of the present invention comprises the following steps:

[0105] S1: Determine the ramping requirements of each local grid in the power grid under the conditions of renewable energy output error, local grid N-1 fault, and local grid disconnection; where N is the number of components in the local grid.

[0106] S2: Incorporate new energy generating units into the main body of ramp-up auxiliary service providers, and construct local grid ramp-up capacity constraints based on the ramp-up requirements of each local grid in the power grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling.

[0107] S3: Based on the planned power of the interconnection lines between local power grids, the availability constraints of the ramp assistance service are constructed.

[0108] S4: Based on the total load of each local power grid in the power grid, with the minimum sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization goal, according to the local power grid climbing capacity constraint and climbing auxiliary service callability constraint, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, optimization is performed to obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

[0109] For explanation, the planned output, ramping capacity and frequency regulation capacity of each unit include the planned output, ramping capacity and frequency regulation capacity of conventional units and the planned output, ramping capacity and frequency regulation capacity of new energy units.

[0110] The flexible climbing capacity optimization method of the high-proportion new energy power grid of the present invention is based on the regional optimization concept, fully considering the climbing requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling, and on this basis, the new energy units are included in the climbing auxiliary service provider to construct the local power grid climbing capacity constraint, and the flexibility of the local power grid is supported by increasing the climbing capacity of the new energy units, thereby realizing the reasonable determination of the climbing capacity of each local power grid, which can effectively ensure that the high-proportion new energy power grid has sufficient flexibility and stability. At the same time, based on the planned power of the interconnection line between the local power grids, the climbing auxiliary service callability constraint is constructed, which can ensure that on the basis of the planned power of the interconnection line, there is sufficient climbing capacity between the local power grids to cope with possible load fluctuations and new energy output changes, ensuring the callability of the climbing auxiliary service, promoting the consumption and utilization of new energy, and improving the safety of power grid operation as a whole. Then, based on the total load of each local power grid within the power grid, optimization is performed with the minimum sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization goal. By introducing the insufficient climbing penalty cost, new energy units are encouraged to actively participate in power grid regulation, which effectively reduces the overall cost of power grid operation and reserves sufficient climbing margin for each local power grid.

[0111] Explanatory note: a high proportion of renewable energy power grid usually refers to a power grid in which renewable energy power generation accounts for more than 20%.

[0112] Explanatory, the N-1 fault of the local power grid means that under normal operation, after any component (such as lines, generators and transformers, etc.) in the local power grid fails or is cut off, the local power grid should be able to maintain stable operation and normal power supply, other components are not overloaded, and the voltage and frequency are within the allowable range. Here N represents the total number of components in the local power grid, and 1 represents that one of the components fails or is cut off. The N-1 fault criterion is to evaluate the stability and reliability of the local power grid in the event of a single component failure. By following the N-1 fault criterion, the power supply reliability and stability of the local power grid can be effectively improved to ensure the normal power demand of users.

[0113] Explanatory note: local grid decoupling means that when the stability of a local grid in the power grid is destroyed due to certain reasons (such as equipment failure and interference, etc.) and it is unable to maintain normal synchronous operation, in order to prevent the accident from expanding and ensure the stable operation of the entire power grid, the interconnection lines of this local grid will be automatically or manually disconnected, that is, decoupling.

[0114] Grid flexibility consists of two parts: one is the flexible resources called in real time, namely the frequency regulation capacity, and the other is the flexible resources reserved for the next scheduling period, namely the ramp capacity.

[0115] In a possible implementation, for a high proportion of new energy power grid, the flexible ramping demand considered includes the prediction error of the new energy output. Therefore, the ramping demand of each local power grid under the condition of the new energy output error can be determined by the following formula:

[0116]

[0117]

[0118] in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z time t New energy output at +1; For local power grid z time t The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time.

[0119] In addition, when a single machine failure occurs, the flexible resources of the local power grid should be called at the same time, and the ramp demand and frequency regulation capacity should be able to meet the system's maximum single machine N-1 failure shortage. Therefore, the ramp demand of each local power grid in the case of local power grid N-1 failure can be determined by the following formula:

[0120]

[0121] in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power.

[0122] In addition, in the case of local grid disconnection, the ramp capacity and frequency regulation capacity should be able to meet the tie line shortage of the local grid. Therefore, the ramp demand of each local grid in the case of local grid disconnection can be determined by the following formula:

[0123] When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0124]

[0125] in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z time t Time contact line l Planned power of the tie line.

[0126] When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0127]

[0128] in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

[0129] In a possible implementation, for a high proportion of new energy power grid, relying solely on conventional units may not be able to meet the ramp demand, so it is considered to include new energy units in the main body of ramp auxiliary service providers. On this basis, the ramp capacity constraints of the local power grid can be constructed according to the ramp demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling.

[0130] Exemplarily, the constructed local power grid ramp capacity constraint is as follows:

[0131]

[0132]

[0133]

[0134]

[0135]

[0136] in, For local power gridz Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

[0137] In a possible implementation, considering the callability of the ramp-up auxiliary service, it is necessary to ensure that the ramp-up auxiliary service is not constrained by the tie line section. On this basis, the callability constraint of the ramp-up auxiliary service can be constructed in combination with the planned power of the tie lines between the local power grids. The callability of the ramp-up auxiliary service can be ensured by jointly optimizing the planned power of the tie lines, thereby improving the overall safety of the power grid operation.

[0138] Exemplarily, the constructed callability constraint of the hill climbing assistance service is as follows:

[0139]

[0140]

[0141] in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional unitsi time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For conventional units i time t Frequency modulation capacity requirements; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

[0142] In a possible implementation, considering that a high proportion of renewable energy power grids may experience insufficient ramping, an insufficient ramping penalty cost is designed to ensure the convergence of the optimization model.

[0143] For example, the optimization objective is to minimize the sum of output cost, frequency regulation cost and insufficient climbing penalty cost, and construct the optimization objective function: As described in the following formula:

[0144]

[0145] in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i Unit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t FM capacity; For local power gridz The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z time t Insufficient downhill climbing capacity.

[0146] In addition, based on the constraints of the local power grid climbing capacity and the callability of climbing auxiliary services, the optimization objective function is optimized by combining the power grid power balance constraints, conventional unit output constraints, conventional unit climbing capacity constraints, local power grid frequency regulation capacity constraints, interconnection line transmission power constraints, new energy unit climbing capacity constraints and new energy unit climbing capacity constraints. Optimize and ensure the stable operation of the power grid.

[0147] Exemplarily, the power grid power balance constraint is:

[0148]

[0149] in, Pz,d For local power grid z Moment t Total load; For local power grid z Conventional unit set; For conventional units i At the moment t contribution; For new energy units j Moment t 's planned contribution; For local power grid z A set of new energy units.

[0150] Exemplarily, the conventional unit output constraint is:

[0151]

[0152]

[0153] in, For conventional units i time t The climbing capacity provided; For conventional units i At the moment t FM capacity; For conventional units i Moment tThe downhill climbing capacity provided; For conventional units i Output limit; For conventional units i The lower output limit.

[0154] Exemplarily, the conventional unit climbing capability constraint is:

[0155]

[0156]

[0157] Among them, For conventional units i The upper limit of climbing ability; For conventional units i The lower limit of climbing ability.

[0158] Exemplarily, the local power grid frequency regulation capacity constraint is:

[0159]

[0160] in, For local power grid z time t frequency modulation capacity requirements.

[0161] Exemplarily, the tie line transmission power constraint is:

[0162]

[0163] in, For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of section power.

[0164] Exemplarily, the climbing capability constraint of the new energy unit is:

[0165]

[0166] in, For new energy units j Moment t The climbing capacity provided; For new energy units j time t The forecast output.

[0167] Exemplarily, the ramp capacity constraint of the new energy unit is:

[0168]

[0169]

[0170]

[0171] in, For new energy units j time t The downhill climbing capacity provided; For new energy units j time t +1 predicted output; For new energy units j time t climbing ability.

[0172] Based on the above optimization objective function And several constraints constitute an optimization model, which is a linear model and can be solved by mature linear programming optimization solving software, such as CPLEX solver, to obtain the flexible ramping capacity optimization results of the high-proportion new energy power grid, including the planned output, ramping capacity and frequency regulation capacity of each unit.

[0173] In general, the flexible climbing capacity optimization method of the high-proportion new energy power grid of the present invention innovatively proposes to consider the climbing requirements of the local power grid under the conditions of new energy output error, local power grid N-1 fault and local power grid decoupling to ensure that the local power grid has sufficient flexibility; and innovatively involves new energy units in providing local power grid climbing auxiliary services; and introduces the planned power of the interconnection line to achieve joint optimization, and constructs the callability constraints of the climbing auxiliary service to fully consider the callability of the climbing capacity. Finally, the innovative introduction of insufficient climbing penalty costs is used to construct an optimization model that considers the flexibility regulation capability requirements of the local power grid, and the optimization results of the flexible climbing capacity of the high-proportion new energy power grid are obtained by solving the optimization model.

[0174] The following are device embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0175] See also Figure 3In another embodiment of the present invention, a flexible ramping capacity optimization system for a high-proportion new energy power grid is provided, which can be used to implement the above-mentioned flexible ramping capacity optimization method for a high-proportion new energy power grid. Specifically, the flexible ramping capacity optimization system for a high-proportion new energy power grid includes a demand determination module, a ramping capacity constraint construction module, a callability constraint construction module and an optimization module.

[0176] Among them, the demand determination module is used to determine the climbing demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; where N is the number of components in the local power grid; the climbing capacity constraint construction module is used to include the new energy units into the main body of the climbing auxiliary service provider, and construct the local power grid climbing capacity constraint according to the climbing demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling; the callability constraint construction module is used to build the local power grid climbing capacity constraint based on the interconnection lines between the local power grids. Planned power, constructing the callability constraint of climbing auxiliary service; the optimization module is used to optimize the total load of each local power grid in the power grid, with the minimum sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization target, according to the local power grid climbing capacity constraint and the callability constraint of climbing auxiliary service, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, and obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

[0177] In a possible implementation manner, determining the ramp requirements of each local power grid in the power grid under the condition of a new energy output error, a local power grid N-1 fault, and a local power grid decoupling includes: determining the ramp requirements of each local power grid under the condition of a new energy output error by the following formula:

[0178]

[0179]

[0180] in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z Moment t New energy output at +1; For local power grid z timet The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time.

[0181] The ramping requirements of each local grid in the event of a local grid N-1 fault are determined by the following formula:

[0182]

[0183] in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power.

[0184] When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0185]

[0186] in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z Moment t Time contact line l Planned power of the tie line.

[0187] When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula:

[0188]

[0189] in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

[0190] In a possible implementation, the new energy generating set is incorporated into the main body of providing ramp auxiliary services, and according to the ramp requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid decoupling, the local power grid ramp capacity constraint is constructed, including:

[0191] Construct the following local power grid ramp capacity constraint:

[0192]

[0193]

[0194]

[0195]

[0196]

[0197] in, For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

[0198] In a possible implementation manner, constructing the callability constraint of the hill climbing assistance service based on the planned power of the tie line between the local power grids includes:

[0199] Construct the following callability constraint for the hill climbing assistance service:

[0200]

[0201]

[0202] in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units itime t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For conventional units i time t Frequency modulation capacity requirements; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

[0203] In a possible implementation, the optimization objective is to minimize the sum of the output cost, the frequency regulation cost, and the insufficient climbing penalty cost. According to the local power grid climbing capacity constraint and the climbing auxiliary service callability constraint, the optimization is combined with the power grid power balance constraint, the conventional unit output constraint, the conventional unit climbing capacity constraint, the local power grid frequency regulation capacity constraint, the interconnection line transmission power constraint, the new energy unit climbing capacity constraint, and the new energy unit climbing capacity constraint. By constructing the following optimization objective function To optimize:

[0204]

[0205] in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units iUnit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t FM capacity; For local power grid z The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z time t Insufficient downhill climbing capacity.

[0206] In a possible implementation manner, the power grid power balance constraint is:

[0207]

[0208] in, Pz,d For local power grid z Moment t Total load; For local power grid z Conventional unit set; For conventional units i At the moment t contribution; For new energy units j time t 's planned contribution; For local power grid z A set of new energy units.

[0209] The conventional unit output constraint is:

[0210]

[0211]

[0212] in, For conventional units i time t The climbing capacity provided; For conventional units i At the moment t FM capacity; For conventional units i time tThe downhill climbing capacity provided; For conventional units i Output limit; For conventional units i The lower output limit.

[0213] The conventional unit climbing capability constraint is:

[0214]

[0215]

[0216] in, For conventional units i The upper limit of climbing ability; For conventional units i The lower limit of climbing ability.

[0217] The local power grid frequency regulation capacity constraint is:

[0218]

[0219] in, For local power grid z time t frequency modulation capacity requirements.

[0220] The tie line transmission power constraint is:

[0221]

[0222] in, For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of section power.

[0223] See also Figure 2 , the climbing capability constraint of the new energy unit is:

[0224]

[0225] in, For new energy units j time t The climbing capacity provided; For new energy units j time t The forecast output.

[0226] The climbing capacity constraint of the new energy unit is:

[0227]

[0228]

[0229]

[0230] in, For new energy units j time t The downhill climbing capacity provided; For new energy units j time t +1 predicted output; For new energy units j time t climbing ability.

[0231] All relevant contents of each step involved in the embodiment of the aforementioned flexible ramping capacity optimization method for a high-proportion new energy power grid can be referred to the functional description of the functional modules corresponding to the flexible ramping capacity optimization system for a high-proportion new energy power grid in the embodiment of the present invention, and will not be repeated here.

[0232] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0233] In another embodiment of the present invention, a computer device is provided, the computer device including a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of the flexible ramp capacity optimization method of a high-proportion new energy power grid.

[0234] In another embodiment of the present invention, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the flexible ramp capacity optimization method for a high-proportion new energy power grid in the above embodiment.

[0235] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0236] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0237] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0238] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0239] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A flexible ramp capacity optimization method for a high-proportion new energy power grid, characterized in that: include: Determine the ramp requirements of each local grid in the power grid under the conditions of new energy output error, local grid N-1 fault, and local grid disconnection; where N is the number of components in the local grid; Incorporate new energy units into the main body of ramp-up auxiliary service providers, and build local grid ramp-up capacity constraints based on the ramp-up requirements of each local grid in the power grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling; Based on the planned power of the interconnection lines between local power grids, the availability constraints of the ramp assistance service are constructed; Based on the total load of each local power grid in the power grid, with the minimization of the sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization goal, according to the local power grid climbing capacity constraint and the callability constraint of climbing auxiliary service, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, optimization is performed to obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

2. The flexible ramp capacity optimization method for a high-proportion new energy power grid according to claim 1 is characterized in that: Determining the ramp requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid disconnection includes: The ramp requirements of each local power grid under the condition of renewable energy output error are determined by the following formula: in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z time t New energy output at +1; For local power grid z time t The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time; The ramping requirements of each local grid in the event of a local grid N-1 fault are determined by the following formula: in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power; When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula: in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z time t Time contact line l The planned power of the tie line; When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula: in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

3. The flexible ramp capacity optimization method for a high-proportion new energy power grid according to claim 2 is characterized in that: Including new energy units in the main body of ramp-up auxiliary service providers, and constructing local grid ramp-up capacity constraints according to the ramp-up requirements of each local grid in the grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling include: Construct the following local power grid ramp capacity constraint: in, For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

4. The flexible ramp capacity optimization method for a high-proportion new energy power grid according to claim 1 is characterized in that: The construction of the callability constraint of the ramp assistance service based on the planned power of the tie line between the local power grids includes: Construct the following callability constraint for the hill climbing assistance service: in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

5. The flexible ramp capacity optimization method for a high-proportion new energy power grid according to claim 1 is characterized in that: The optimization objective is to minimize the sum of output cost, frequency regulation cost and insufficient climbing penalty cost. According to the local power grid climbing capacity constraint and climbing auxiliary service callability constraint, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, the optimization objective function of the following formula is constructed. To optimize: in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i Unit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t The participating frequency regulation capacity; For local power grid z The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z time t Insufficient downhill climbing capacity.

6. The flexible ramp capacity optimization method for a high-proportion new energy power grid according to claim 1 is characterized in that: The power grid power balance constraint is: in, P z,d For local power grid z time t Total load; For local power grid z Conventional unit set; For conventional units i At the moment t contribution; For new energy units j time t 's planned contribution; For local power grid z A collection of new energy units; The output constraints of conventional units are: in, For conventional units i time t The climbing capacity provided; For conventional units i At the moment t The participating frequency regulation capacity; For conventional units i time t The downhill climbing capacity provided; For conventional units i Output limit; For conventional units i The lower limit of output; The climbing capability constraint of conventional units is: in, For conventional units i The upper limit of climbing ability; For conventional units i The lower limit of climbing ability; The frequency regulation capacity constraint of the local power grid is: in, For local power grid z time t Frequency modulation capacity requirements; The transmission power constraint of the tie line is: in, For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; The climbing capability constraint of new energy units is: in, For new energy units j time t The climbing capacity provided; For new energy units j time t The predicted output of The ramp capacity constraint of new energy units is: in, For new energy units j time t The downhill climbing capacity provided; For new energy units j time t +1 predicted output; For new energy units j time t climbing ability.

7. A flexible ramp capacity optimization system for a high-proportion new energy power grid, characterized in that: include: The demand determination module is used to determine the ramp demand of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid disconnection; The ramp capacity constraint building module is used to include new energy units in the main body of ramp auxiliary service providers, and to build the local grid ramp capacity constraints according to the ramp requirements of each local grid in the power grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling; A callability constraint building module is used to build the callability constraints of the ramp assistance service based on the planned power of the tie lines between the local power grids; The optimization module is used to optimize the total load of each local power grid in the power grid, with the minimum sum of output cost, frequency regulation cost and insufficient climbing penalty cost as the optimization target, according to the local power grid climbing capacity constraint and climbing auxiliary service callability constraint, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, to obtain the planned output, climbing capacity and frequency regulation capacity of each unit.

8. The flexible ramp capacity optimization system for a high-proportion new energy power grid according to claim 7 is characterized in that: Determining the ramp requirements of each local power grid in the power grid under the condition of new energy output error, local power grid N-1 fault and local power grid disconnection includes: The ramp requirements of each local power grid under the condition of renewable energy output error are determined by the following formula: in, For local power grid z time t The uphill demand under the condition of new energy output error; For local power grid z time t Downhill climbing requirements when there is an error in the output of new energy; For local power grid z time t New energy output at +1; For local power grid z time t The new energy output at that time; is the local power grid at time z t The error range of new energy output at that time; The ramping requirements of each local grid in the event of a local grid N-1 fault are determined by the following formula: in, For local power grid z time t The up-ramp demand in case of N-1 fault in the local grid; For local power grid z time t +1 frequency modulation capacity requirement; For local power grid z time t Maximum single machine power; When the local power grid is the receiving end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula: in, For local power grid z time t The up-ramp demand when the local power grid is disconnected; For local power grid z time t Time contact line l The planned power of the tie line; When the local power grid is the sending-end power grid, the ramping requirements of each local power grid when the local power grid is disconnected are determined by the following formula: in, For local power grid z time t The down-ramp demand when the local power grid is disconnected.

9. The flexible ramp capacity optimization system for a high-proportion new energy power grid according to claim 8 is characterized in that: Including new energy units in the main body of ramp-up auxiliary service providers, and constructing local grid ramp-up capacity constraints according to the ramp-up requirements of each local grid in the grid under the conditions of new energy output error, local grid N-1 fault, and local grid decoupling include: Construct the following local power grid ramp capacity constraint: in, For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For local power grid z time t The uphill climbing capacity is insufficient; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t The downhill climbing capacity is insufficient; For conventional units i At the moment t of participating frequency regulation capacity.

10. The flexible ramp capacity optimization system for a high-proportion new energy power grid according to claim 7, characterized in that: The construction of the callability constraint of the ramp assistance service based on the planned power of the tie line between the local power grids includes: Construct the following callability constraint for the hill climbing assistance service: in, Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i time t The climbing capacity provided; For local power grid z A collection of new energy units; For new energy units j time t The climbing capacity provided; For conventional units i time t The downhill climbing capacity provided; For new energy units j time t The downhill climbing capacity provided; For local power grid z time t Time contact line l The planned power of the tie line; For local power grid z Contact line l The upper limit of the cross-sectional power; For local power grid z Contact line l The lower limit of the section power; For conventional units i time t For contact lines l Sensitivity; For new energy units j time t For contact lines l sensitivity.

11. The flexible ramp capacity optimization system for a high-proportion new energy power grid according to claim 7, characterized in that: The optimization objective is to minimize the sum of output cost, frequency regulation cost and insufficient climbing penalty cost. According to the local power grid climbing capacity constraint and climbing auxiliary service callability constraint, combined with the power grid power balance constraint, conventional unit output constraint, conventional unit climbing capacity constraint, local power grid frequency regulation capacity constraint, interconnection line transmission power constraint, new energy unit climbing capacity constraint and new energy unit climbing capacity constraint, the optimization objective function of the following formula is constructed. To optimize: in, T Indicates the total number of scheduling time periods; Z is a local grid set of the power grid; For local power grid z Conventional unit set; For conventional units i Unit output cost; For conventional units i At the moment t contribution; For conventional units i Unit frequency regulation cost; For conventional units i At the moment t The participating frequency regulation capacity; For local power grid z The penalty cost per unit for insufficient up-ramp; For local power grid z time t The uphill climbing capacity is insufficient; For local power grid z The unit penalty cost for insufficient downhill climbing; For local power grid z time t Insufficient downhill climbing capacity.

12. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the flexible ramping capacity optimization method for a high-proportion new energy power grid are implemented as described in any one of claims 1 to 6.

13. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the flexible ramping capacity optimization method for a high-proportion new energy power grid are implemented as described in any one of claims 1 to 6.

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