Cooperative scheduling operation method and device for state grid provincial multi-stage power system

Abstract

The invention discloses a state grid provincial multi-stage power system cooperative scheduling operation method and device. Comprising the following steps: constructing a state-grid-province multi-stage power system collaborative scheduling model according to a state dispatching target demand, a network dispatching target demand, a province dispatching target demand, load balance constraints of each level, multiple direct dispatching unit output upper and lower limit constraints, tie line transaction constraints, province dispatching unit output constraints and positive and negative standby constraints; constructing a provincial domain equivalent aggregation node and a network domain equivalent aggregation node to simplify the structure of the state grid provincial multi-stage power system collaborative scheduling model; and solving the simplified state grid provincial multi-stage power system cooperative scheduling model based on a target cascade method to obtain a multi-stage power system cooperative scheduling operation result. The invention belongs to the field of power system collaboration. According to the method, the optimization scheduling solving efficiency of the power system under whole-network cooperation is improved.

Description

Technical Field

[0001] The present invention relates to the field of power system coordination, and particularly to a coordinated dispatching operation method and device for multi-level power systems of state grid provinces. Background Art

[0002] With the advancement of the construction of the new power system, the rapid development of renewable energy, and the changing demand for system balance regulation capabilities, due to the reverse distribution of resource endowments and energy demands, power surpluses / shortages at the provincial and regional levels occur from time to time. The power system balance mode has changed from "provincial balance" to "national grid mutual assistance". Considering the power and electricity balance of the power system at multiple levels in an overall manner is one of the key measures for the safe and stable operation of the power system.

[0003] Currently, there are a large number of research on coordinated dispatching from the perspective of mutual assistance. However, the current research focuses on the coordinated dispatching at the national grid-provincial and grid-provincial levels, and does not fully explore the mutual assistance potential across provinces and regions. Therefore, it is urgent to explore and construct a multi-level coordinated balance model of national grid-province to achieve the optimal allocation of local and global resources in an overall manner. Summary of the Invention

[0004] The present invention provides a coordinated dispatching operation method and device for multi-level power systems of state grid provinces, solves the technical problem of unbalanced global power resource allocation in the prior art, and achieves the technical effect of balancing the global power resources.

[0005] In the first aspect, the present invention provides a coordinated dispatching operation method for multi-level power systems of state grid provinces, the method comprising:

[0006] Construct a coordinated dispatching model for multi-level power systems of state grid provinces according to the target requirements of the national dispatching, the target requirements of the grid dispatching, the target requirements of the provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly dispatched units, the tie-line transaction constraints, the output constraints of the provincial dispatching units, and the positive and negative reserve constraints;

[0007] Construct provincial equivalent aggregation nodes and grid equivalent aggregation nodes to simplify the structure of the coordinated dispatching model for multi-level power systems of state grid provinces;

[0008] Take the order of national, grid, and province as the outer ring order of the structure of the simplified coordinated dispatching model for multi-level power systems of state grid provinces, and the order of province, grid, and national as the inner ring order of the structure, and solve the simplified coordinated dispatching model for multi-level power systems of state grid provinces based on the target cascade method to obtain the coordinated dispatching operation results of the multi-level power system.

[0009] Further, taking the minimum of the system operation cost and the transmission cost within the coordination scope of the national dispatching as the target requirement, including:

[0010]

[0011] Among them, min F1 is the minimum of the sum of the system operation cost and the transmission cost within the coordination scope of the national dispatcher, is the system operation cost within the coordination scope of the national dispatcher, is the inter-regional transmission cost within the coordination scope of the national dispatcher, is the system operation cost of region a1, is the operation cost of thermal power unit i1 of the national dispatcher at time t, A Regi is the total number of regions within the coordination scope of the national dispatcher, T is the total number of operation times in a day, is the output of thermal power unit i1 of the national dispatcher in region a1 at time t, and are both the coefficients of the unit operation cost function of thermal power unit i1 of the national dispatcher, is the transmission power of inter-regional tie line k1 at time t, is the total number of inter-regional tie lines, is the transmission power of inter-regional tie line k1 at time t.

[0012] Furthermore, with the goal of minimizing the system operation cost and transmission cost within the coordination scope of the network dispatcher, it includes:

[0013]

[0014]

[0015] Among them, min F2 is the minimum of the sum of the system operation cost and the transmission cost within the coordination scope of the network dispatcher, is the system operation cost within the coordination scope of the network dispatcher, is the cross-provincial transmission cost, is the system operation cost of provincial area a2 in the network dispatcher, A Prov is the total number of provincial areas within the coordination scope of the network dispatcher, is the operation cost of thermal power unit i2 of the network dispatcher at time t, and are both the coefficients of the unit operation cost function of thermal power unit i2 of the network dispatcher, is the output of thermal power unit i2 of the network dispatcher in provincial area a2 at time t, is the transmission cost of cross-provincial tie line, is the total number of cross-provincial tie lines, is the transmission power of cross-provincial tie line k2 at time t.

[0016] Furthermore, with the goal of minimizing the system operation cost within the scope of the provincial dispatcher, it includes:

[0017]

[0018] Among them, min F3 represents the minimum system operation cost of the provincial dispatching center, is the system operation cost within the scope of the provincial dispatching center, is the operation cost of thermal power unit i3 of the provincial dispatching center at time t, f 2,t is the penalty cost for clean energy curtailment at time t within the scope of the provincial dispatching center, f 3,t is the penalty cost for load shedding at time t within the scope of the provincial dispatching center, is the total number of thermal power units of the provincial dispatching center, is the total number of independent energy storage of the provincial dispatching center within the scope a3 of the provincial dispatching center, is the charging and discharging cost of the independent energy storage es3 of the provincial dispatching center at time t, And, are all the coefficients of the unit operation cost function of thermal power unit i3 of the provincial dispatching center, is the output of thermal power unit i3 of the provincial dispatching center within the scope a3 of the provincial dispatching center at time t, c M is the clean energy curtailment penalty coefficient, is the total number of wind turbines of the provincial dispatching center within the scope a3 of the provincial dispatching center, is the wind curtailment power of wind turbine w3 of the provincial dispatching center within the scope a3 of the provincial dispatching center at time t, is the total number of photovoltaic units of the provincial dispatching center within the scope a3 of the provincial dispatching center, is the photovoltaic curtailment power of photovoltaic v3 of the provincial dispatching center within the scope a3 of the provincial dispatching center at time t, c L is the load shedding penalty coefficient, is the load shedding power at time t within the scope a3 of the provincial dispatching center, is the charging cost of the independent energy storage es3 of the provincial dispatching center, is the discharging cost of the independent energy storage es3 of the provincial dispatching center, is the charging power of the independent energy storage es3 of the provincial dispatching center within the scope a3 of the provincial dispatching center at time t, is the discharging power of the independent energy storage es3 of the provincial dispatching center within the scope a3 of the provincial dispatching center at time t.

[0019] Furthermore, the load balance constraints at each level include:

[0020]

[0021] Among them, is the system net load of region a1 at time t, is the total sum of the net loads of each provincial region at time t, is the output of the in-region dispatching thermal power unit i2 of region a1 at time t, is the output of the national dispatching hydropower unit 1 of region a1 at time t, is the output of the in-region dispatching hydropower unit 2 of region a1 at time t, is the output of the in-region dispatching wind turbine w2 of region a1 at time t, Output of the grid-connected PV in area a1 at time period t Total number of grid-connected thermal power units in area a1 Total number of state-grid-regulated hydropower units in area a1 Total number of grid-connected hydropower units in area a1 Total number of grid-connected wind turbines in area a1 Total number of grid-connected PVs in area a1, A Regi Total number of areas within the coordination scope of the state grid Positive slack variable of the load in area a1 Negative slack variable of the load in area a1 Total number of inter-regional tie lines Output of the state-grid-regulated thermal power unit i1 in area a1 at time period t

[0022] It also includes:

[0023]

[0024] Among them, System net load of province a2 at time period t System total load at time period t Output of the provincial-grid-regulated thermal power unit i3 in province a2 at time period t Output of the grid-connected hydropower unit 2 in province a2 at time period t Output of the provincial-grid-regulated hydropower unit 3 in province a2 at time period t Output of the provincial-grid-regulated wind turbine w3 in province a2 at time period t Output of the provincial-grid-regulated PV v3 in province a2 at time period t Charging power of the provincial-grid-regulated independent energy storage es3 in province a2 at time period t Discharging power of the provincial-grid-regulated independent energy storage es3 in province a2 at time period t Total number of provincial-grid-regulated thermal power units in province a2 Total number of grid-connected hydropower units in province a2 Total number of provincial-grid-regulated hydropower units in area a1 Total number of provincial-grid-regulated wind turbines in province a2 Represents the total number of provincial-grid-regulated PVs in province a2 Represents the total number of provincial-grid-regulated independent energy storages in province a2 Positive slack variable of the load in province a2 Negative slack variable of the load in province a2 Total number of inter-provincial tie lines, A Prov Total number of provinces within the coordination scope of the grid regulation The output of the thermal power unit i2 directly regulated by the provincial power dispatching in the provincial area a2 during the time period t;

[0025] It also includes:

[0026]

[0027] Among them, represents the output of the hydroelectric unit 3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, T k,t represents the transmission power of the node cross-region and cross-province tie line k within the provincial power dispatching scope a3 at the moment t, represents the output of the wind turbine w3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, represents the output of the photovoltaic v3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, represents the charging power of the independent energy storage es3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, represents the discharging power of the independent energy storage es3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, represents the number of hydroelectric units directly regulated by the provincial power dispatching within the provincial power dispatching scope a3; N k represents the total number of node cross-region and cross-province tie lines k within the provincial power dispatching scope a3, is the total number of thermal power units directly regulated by the provincial power dispatching, is the total number of independent energy storages directly regulated by the provincial power dispatching within the provincial power dispatching scope a3, is the total number of wind turbines directly regulated by the provincial power dispatching within the provincial power dispatching scope a3, is the total number of wind turbines directly regulated by the provincial power dispatching within the provincial power dispatching scope a3, is the output of the thermal power unit i3 directly regulated by the provincial power dispatching within the provincial power dispatching scope a3 during the time period t, is the total system load of the provincial area during the time period t.

[0028] Furthermore, the upper and lower limit constraints of the output of multiple directly regulated units include:

[0029]

[0030] Among them, represents the output ratio of the thermal power unit i1 directly regulated by the national power dispatching to the area a1, and A1 represents the total number of areas supplied by the thermal power unit i1 directly regulated by the national power dispatching, is the output of the thermal power unit i1 directly regulated by the national power dispatching within the area a1 during the time period t, is the minimum output of the thermal power unit i1 directly regulated by the national power dispatching within the area a1 during the time period t, is the maximum output of the thermal power unit i1 directly regulated by the national power dispatching within the area a1 during the time period t;

[0031] It also includes:

[0032]

[0033] Among them, The output ratio of thermal power unit i2 under grid dispatching to the province a2, and A2 represents the total number of supply areas of thermal power unit i2 under grid dispatching. is the output of thermal power unit i2 under grid dispatching in province a2 at time t. is the minimum output of thermal power unit i2 under grid dispatching at time t. is the maximum output of thermal power unit i2 under grid dispatching at time t.

[0034] Furthermore, the tie-line trading constraints include:

[0035]

[0036] Among them, represents the transmission power of the inter-regional and inter-provincial tie-line k n at time t. represents the transmission power of the inter-regional and inter-provincial tie-line k n under the plan O n at time t. represents the transmission power of the inter-regional and inter-provincial tie-line k n under the transaction I n at time t; when n = 1, it is an inter-regional tie-line, and when n = 2, it is an inter-provincial tie-line.

[0037] It also includes:

[0038]

[0039] Among them, is the correlation coefficient between the positive direction of tie-line k n and the actual trading power flow direction. is the trading power of each level of trading behavior I n at time t. is a variable from 0 to 1 and represents whether the trading behavior I n is transmitted via the trading path p. is a variable from 0 to 1 and represents whether the path p is composed of the tie-line k n and N p is the total number of trading paths. is the transmission power of the inter-regional and inter-provincial tie-line k n under the transaction I n at time t.

[0040] Furthermore, the unit output constraints and positive and negative reserve constraints of the provincial dispatching include:

[0041]

[0042]

[0043] Among them, The maximum output of thermal power unit i3 under the provincial dispatching during period t, The minimum output of thermal power unit i3 under the provincial dispatching during period t, Denotes the group of thermal power units under the national dispatching The maximum output during period t, Denotes the group of thermal power units under the national dispatching The minimum output during period t, Denotes the group of thermal power units under the grid dispatching The maximum output during period t, Denotes the group of thermal power units under the grid dispatching The minimum output during period t, Denotes the group of thermal power units under the provincial dispatching The maximum output during period t, The group of thermal power units under the provincial dispatching The minimum output during period t, Denotes the maximum upward ramp rate of thermal power unit i1 under the national dispatching, Denotes the maximum downward ramp rate of thermal power unit i1 under the national dispatching, Denotes the maximum upward ramp rate of thermal power unit i2 under the grid dispatching, Denotes the maximum downward ramp rate of thermal power unit i2 under the grid dispatching, Denotes the maximum upward ramp rate of thermal power unit i3 under the provincial dispatching, Denotes the maximum downward ramp rate of thermal power unit i3 under the provincial dispatching, Denotes the start-stop status of thermal power unit i3 under the provincial dispatching during period t, Indicates that thermal power unit i3 under the provincial dispatching is shut down during period t, Denotes that thermal power unit i3 under the provincial dispatching is started up during period t, Is the capacity of the directly dispatched hydroelectric unit h3 under the provincial dispatching within the provincial dispatching scope a3 during period t, Denotes the minimum output of the directly dispatched hydroelectric unit h3 under the provincial dispatching within the provincial dispatching scope a3, Denotes the deduction value of the unstable output of the unit during period t, Denotes the system positive reserve capacity requirement during period t, Denotes the system negative reserve capacity requirement during period t, Is the output of thermal power unit i3 under the provincial dispatching within the provincial dispatching scope a3 during period t, Is the output of thermal power unit i1 under the grid dispatching within region a1 during period t, Is the output of thermal power unit i2 under the grid dispatching within provincial region a2 during period t, Is the output of thermal power unit i1 under the grid dispatching within region a1 at period t - 1, Is the output of thermal power unit i2 under the grid dispatching within provincial region a2 at period t - 1, Is the output of thermal power unit i3 under the provincial dispatching within the provincial dispatching scope a3 at period t - 1.

[0044] Further, based on the target cascade method, the simplified collaborative dispatching model of the multi-level power system of the State Grid Province is solved to obtain the collaborative dispatching operation results of the multi-level power system, including:

[0045] After determining the output of the provincial regulating thermal power unit i3 within the range a3 of the provincial regulation at time t, judge whether the first absolute value of the load reverse relaxation variable in region a1 and the load forward relaxation variable in region a1, and the second absolute value of the load forward relaxation variable in provincial region a2 and the load negative relaxation variable in provincial region a2 both meet the first preset constraint condition;

[0046] If both are satisfied, determine the system net load in region a1 at time t; if not, update the penalty coefficient of the collaborative dispatching model of the multi-level power system of the State Grid Province;

[0047] After determining the system net load in region a1 at time t, judge whether the first absolute value and the second absolute value both meet the second preset constraint condition;

[0048] If satisfied, judge whether the collaborative dispatching model of the multi-level power system of the State Grid Province meets the global constraint condition; if not, update the penalty coefficient of the collaborative dispatching model of the multi-level power system of the State Grid Province;

[0049] If the global constraint condition is satisfied, output the collaborative dispatching operation results of the multi-level power system; if not, update the index values of the inner loop structure and the outer loop structure.

[0050] In the second aspect, the present invention provides a collaborative dispatching operation device for a multi-level power system of the State Grid Province, and the device includes:

[0051] A model construction module, configured to construct a collaborative dispatching model of the multi-level power system of the State Grid Province according to the target requirements of the national dispatching, the target requirements of the network dispatching, the target requirements of the provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly regulated units, the tie-line transaction constraints, the unit output constraints of the provincial dispatching, and the positive and negative reserve constraints;

[0052] A structure simplification module, configured to construct provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the collaborative dispatching model of the multi-level power system of the State Grid Province;

[0053] An operation result module, configured to use the order of the national, network, and provincial as the outer loop order of the structure of the simplified collaborative dispatching model of the multi-level power system of the State Grid Province, and the order of the provincial, network, and national as the inner loop order of the structure, and solve the simplified collaborative dispatching model of the multi-level power system of the State Grid Province based on the target cascade method to obtain the collaborative dispatching operation results of the multi-level power system.

[0054] One or more technical solutions provided in the present invention have at least the following technical effects or advantages:

[0055] The present invention constructs a multi-level collaborative balanced dispatching optimization model for the national grid-provincial grid by considering the differences in hierarchical objectives and constraints, as well as the actual impacts of directly regulated units and tie lines, providing guidance for subsequent exploration of dispatching methods suitable for multi-level collaborative dispatching of the national grid-provincial grid, and realizing multi-level balanced dispatching.

[0056] The present invention combines equivalent aggregation and the objective cascade method to construct a solution method suitable for multi-level collaborative optimization dispatching of the national grid-provincial grid, which not only takes into account the actual power grid and internal mechanism at each level, but also improves the solution efficiency of power system optimization dispatching under the collaboration of the entire network.

[0057] The present invention breaks through the limitation of existing research that ignores the actual situation of three-level collaborative dispatching of the national grid, provincial grid, and county grid in China and only constructs a two-layer collaborative optimization dispatching model from the perspective of two-level interconnection. In addition, in the model, it breaks through the limitation of only considering the upper and lower limits of directly regulated units and the transmission capacity constraints of tie lines in existing dispatching models, and supplements the consideration of the actual situation of "one unit supplying multiple destinations" of directly regulated units and the two-layer factors of market and dispatching included in tie line channels, constructing a refined multi-level collaborative dispatching optimization model for the national grid-provincial grid considering the actual operation of directly regulated units and tie lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0059] Figure 1 It is a schematic flow chart of a method for collaborative dispatching operation of a multi-level power system of the national grid-provincial grid provided by the present invention;

[0060] Figure 2 It is a schematic flow chart of multi-level collaborative balance solution provided by the present invention;

[0061] Figure 3 It is a schematic flow chart of the solution of the inner and outer loops of the model provided by the present invention;

[0062] Figure 4 It is a schematic structural diagram of a device for collaborative dispatching operation of a multi-level power system of the national grid-provincial grid provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0063] By providing a method for collaborative dispatching operation of a multi-level power system of the national grid-provincial grid, the embodiments of the present invention solve the technical problems of a method for collaborative dispatching operation of a multi-level power system of the national grid-provincial grid in the prior art.

[0064] The technical solution of the present invention for solving the above technical problems is generally as follows:

[0065] A collaborative dispatching operation method for multi-level power systems of state grid provinces, the method includes: constructing a collaborative dispatching model for multi-level power systems of state grid provinces according to the target requirements of national dispatching, the target requirements of network dispatching, the target requirements of provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly dispatched units, the tie-line transaction constraints, the output constraints of provincial dispatching units, and the positive and negative reserve constraints; constructing provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the collaborative dispatching model for multi-level power systems of state grid provinces; taking the order of national, network, and provincial as the outer ring order of the structure of the simplified collaborative dispatching model for multi-level power systems of state grid provinces, and the order of provincial, network, and national as the inner ring order of the structure, and solving the simplified collaborative dispatching model for multi-level power systems of state grid provinces based on the target cascade method to obtain the collaborative dispatching operation results of the multi-level power system.

[0066] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0067] First, it should be noted that the term "and / or" appearing in this article is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0068] Due to the reverse distribution of resource endowments and energy demands, power surpluses or shortages often occur at the provincial and regional levels. The power system balance mode has changed from "provincial balance" to "national network mutual assistance". Considering the power and electricity balance of the power system at multiple levels in an overall manner is one of the key measures for the safe and stable operation of the power system. Currently, there are already two-level collaborative dispatching at the national-network and network-provincial levels, such as patent documents CN201910520075.5, CN201910044730.4, etc.

[0069] The purpose of the present invention is to fully explore the mutual assistance potential across provinces and regions, achieve the optimal allocation of local and global resources in an overall manner, and explore the construction of a collaborative and balanced operation of a multi-level power system of national-network-provincial.

[0070] The present invention provides a collaborative dispatching operation method for a multi-level power system of state grid provinces as shown in Figure 1 and includes steps S11 - S13:

[0071] Step S11, constructing a collaborative dispatching model for a multi-level power system of state grid provinces according to the target requirements of national dispatching, the target requirements of network dispatching, the target requirements of provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly dispatched units, the tie-line transaction constraints, the output constraints of provincial dispatching units, and the positive and negative reserve constraints;

[0072]

Taking the minimum of the system operation cost and transmission cost within the coordination scope of the national dispatching center as the target requirement

[0073] The national dispatching center mainly formulates the inter-regional tie-line plan and the national dispatching unit output plan, aiming at minimizing the system operation cost and transmission cost within the coordination scope of the national dispatching center. Therefore, the target requirements of the national dispatching center are as follows:

[0074]

[0075]

[0076] Among them, the sum of the system operation cost and transmission cost within the coordination scope of the national dispatching center is minimized, is the system operation cost within the coordination scope of the national dispatching center (including the system operation costs of each regional system and the operation cost of the national dispatching thermal power units), is the inter-regional transmission cost within the coordination scope of the national dispatching center, is the system operation cost of region a1, is the operation cost of the national dispatching thermal power unit i1 at time t, A Regi is the total number of regions within the coordination scope of the national dispatching center, and T is the total number of operation times in a day, is the output of the national dispatching thermal power unit i1 in region a1 at time t, and are both the coefficients of the unit operation cost function of the national dispatching thermal power unit i1, is the transmission power of the inter-regional tie-line k1 at time t, is the total number of inter-regional tie-lines, is the transmission power of the inter-regional tie-line k1 at time t.

[0077]

Taking the minimum of the system operation cost and transmission cost within the coordination scope of the network dispatching center as the target requirement

[0078] The network dispatching center mainly formulates the inter-provincial tie-line plan and the network dispatching unit output plan, aiming at minimizing the system operation cost and transmission cost within the coordination scope of the network dispatching center. Therefore, the target requirements of the network dispatching center are as follows:

[0079]

[0080] Among them, min F2 is the minimum of the sum of the system operation cost and transmission cost within the coordination scope of the network dispatching center, is the system operation cost within the coordination scope of the network dispatching center (including the system operation costs of each province within the regional scope and the operation cost of the network dispatching thermal power units), is the inter-provincial transmission cost, is the system operation cost of province a2 in the network dispatching center, A Prov is the total number of provincial regions within the coordination scope of the network dispatching center, is the operating cost of the grid - regulated thermal power unit i2 during the t period, and are all the coefficients of the unit operating cost function of the grid - regulated thermal power unit i2, is the output of the grid - regulated thermal power unit i2 in the province a2 during the period t, is the transmission cost of the inter - provincial tie line, is the total number of inter - provincial tie lines, is the transmission power of the inter - provincial tie line k2 during the t period.

[0081]

Taking the system operating cost within the scope of the provincial dispatching as the target demand

[0082] The provincial dispatching center mainly formulates the output plan of the provincial - dispatched units, aiming at the system operating cost within the provincial scope. Therefore, the target demand of the provincial dispatching includes:

[0083]

[0084] Among them, min F3 means the minimum system operating cost of the provincial dispatching, is the system operating cost within the scope of the provincial dispatching, is the operating cost of the provincial - dispatched thermal power unit i3 during the period t, f 2,t is the penalty cost for the abandonment of clean energy during the t period within the scope of the provincial dispatching, f 3,t is the penalty cost for load shedding during the t period within the scope of the provincial dispatching, is the total number of provincial - dispatched thermal power units, is the total number of provincial - dispatched independent energy storages within the scope a3 of the provincial dispatching, is the charging and discharging cost of the provincial - dispatched independent energy storage es3 during the period t, and, are all the coefficients of the unit operating cost function of the provincial - dispatched thermal power unit i3, is the output of the provincial - dispatched thermal power unit i3 within the scope a3 of the provincial dispatching during the period t, c M is the penalty coefficient for the abandonment of clean energy, is the total number of provincial - dispatched wind turbines within the scope a3 of the provincial dispatching, is the wind abandonment power of the provincial - dispatched wind turbine w3 during the period t within the scope a3 of the provincial dispatching, is the total number of provincial - dispatched photovoltaic units within the scope a3 of the provincial dispatching, is the light abandonment power of the provincial - dispatched photovoltaic v3 during the period t within the scope a3 of the provincial dispatching, c L is the penalty coefficient for load shedding, is the load shedding power at the moment t within the scope a3 of the provincial dispatching, is the charging cost of the provincial - dispatched independent energy storage es3, is the discharging cost of the provincial - dispatched independent energy storage es3, The charging power of the provincial dispatching independent energy storage ES3 within the scope of the provincial dispatching area a3 at time period t The discharging power of the provincial dispatching independent energy storage ES3 within the scope of the provincial dispatching area a3 at time period t

[0085] The constraint conditions respectively include the load balance constraints of each hierarchical system, the upper and lower limits of unit output, the cross-region and cross-province tie-line transaction constraints, the unit output constraints of the provincial dispatching, and the positive and negative reserve constraints

[0086]

Load balance constraints of each hierarchical system

[0087] For each time period t, the load balance constraints of each hierarchical system of the national dispatching, network dispatching, and provincial dispatching can include

[0088]

[0089] Among them is the system net load of region a1 at time period t is the total sum of the net loads of each provincial region at time period t is the output of the network dispatching thermal power unit i2 in region a1 at time period t is the output of the national dispatching hydropower unit 1 in region a1 at time period t is the output of the network dispatching hydropower unit 2 in region a1 at time period t is the output of the network dispatching wind turbine w2 in region a1 at time period t is the output of the network dispatching photovoltaic v2 in region a1 at time period t is the total number of network dispatching thermal power units in region a1 is the total number of national dispatching hydropower units in region a1 is the total number of network dispatching hydropower units in region a1 is the total number of network dispatching wind turbines in region a1 is the total number of network dispatching photovoltaics in region a1, A Regi is the total number of regions within the coordination scope of the national dispatching is region a q is the positive slack variable of the load within is region a q is the reverse slack variable of the load within is the total number of cross-region tie-lines is region a q is the network dispatching thermal power unit i within region a q at the output at time period t

[0090] It also includes

[0091]

[0092]

[0093] Among them, is the system net load of provincial region a2 at time period t, is the system total load of the provincial region at time period t, is the output of the provincial dispatching thermal power unit i3 within provincial region a2 at time period t, is the output of the network dispatching hydroelectric unit 2 within provincial region a2 at time period t, is the output of the provincial dispatching hydroelectric unit 3 within provincial region a2 at time period t, is the output of the provincial dispatching fan w3 within provincial region a2 at time period t, is the output of the provincial dispatching photovoltaic v3 within provincial region a2 at time period t, is the charging power of the provincial dispatching independent energy storage es3 within provincial region a2 at time period t, is the discharging power of the provincial dispatching independent energy storage es3 within provincial region a2 at time period t, is the total number of provincial dispatching thermal power units within provincial region a2, is the total number of network dispatching hydroelectric units within provincial region a2, is the total number of provincial dispatching hydroelectric units within region a1, is the total number of provincial dispatching fans within provincial region a2, represents the total number of provincial dispatching photovoltaics within provincial region a2, represents the total number of provincial dispatching independent energy storages within provincial region a2, is the positive slack variable of the load within provincial region a2, is the negative slack variable of the load within provincial region a2, is the total number of inter-provincial tie lines, A Prov is the total number of provincial regions within the coordination scope of the network dispatching, is the output of the network dispatching thermal power unit i2 within provincial region a2 at time period t;

[0094] It also includes:

[0095]

[0096] Among them, represents the output of the provincial dispatching hydroelectric unit 3 within the provincial dispatching scope a3 at time period t, T k,t represents the transmission power of the node inter-regional and inter-provincial tie line k within the provincial dispatching scope a3 at time t, represents the output of the provincial dispatching fan w3 within the provincial dispatching scope a3 at time period t, represents the output of the provincial dispatching photovoltaic v3 within the provincial dispatching scope a3 at time period t, represents the charging power of the provincial dispatching independent energy storage es3 within the provincial dispatching scope a3 at time period t, represents the discharging power of the provincial dispatching independent energy storage es3 within the provincial dispatching scope a3 at time period t, represents the number of provincial dispatching hydroelectric units within the provincial dispatching scope a3; N kIndicates the total number of cross - regional and cross - provincial tie - lines k for nodes within the scope a3 of the provincial dispatching center. Is the total number of thermal power units dispatched by the provincial dispatching center. Is the total number of independent energy storage units dispatched by the provincial dispatching center within the scope a3. Is the total number of wind turbines dispatched by the provincial dispatching center within the scope a3. Is the total number of wind turbines dispatched by the provincial dispatching center within the scope a3. Is the output of thermal power unit i3 dispatched by the provincial dispatching center within the scope a3 at time period t. Is the total system load of the provincial region at time period t.

[0097]

Output upper and lower limit constraints for multiple directly - dispatched units

[0098] In actual dispatching operation, the national dispatching center needs to dispatch a single unit to supply multiple regions (the same for units dispatched by the grid dispatching center). Based on the proportion of unit capacity share, the output upper and lower limits of directly - dispatched units at the national and grid dispatching levels can be described as follows:

[0099]

[0100] Among them, Indicates the proportion of the output of thermal power unit i1 dispatched by the national dispatching center to region a1, and A1 represents the total number of regions supplied by thermal power unit i1 dispatched by the national dispatching center. Is the output of thermal power unit i1 dispatched by the national dispatching center in region a1 at time period t. Is the minimum output of thermal power unit i1 dispatched by the national dispatching center in region a1 at time period t. Is the maximum output of thermal power unit i1 dispatched by the national dispatching center in region a1 at time period t.

[0101] Also includes:

[0102]

[0103] Among them, Indicates the proportion of the output of thermal power unit i2 dispatched by the grid dispatching center to provincial region a2, and A2 represents the total number of regions supplied by thermal power unit i2 dispatched by the grid dispatching center. Is the output of thermal power unit i2 dispatched by the grid dispatching center in provincial region a2 at time period t. Is the minimum output of thermal power unit i2 dispatched by the grid dispatching center at time period t. Is the maximum output of thermal power unit i2 dispatched by the grid dispatching center at time period t.

[0104]

Tie - line trading constraints

[0105] In the multi - level collaborative dispatching model of national - grid - province, cross - regional and cross - provincial tie - lines, as important objects for interactive transmission between regions, are important ways to couple power balance with inter - provincial and intra - provincial markets and optimize resource allocation. Specifically, the formulation of the overall plan for cross - regional and cross - provincial tie - lines is restricted by both power trading contracts and transmission capacity, and the security of network transmission needs to be ensured.

[0106]

[0107] Among them, represents the transmission power of the inter-regional and inter-provincial tie line k n at time t, represents the transmission power of the inter-regional and inter-provincial tie line k n under the plan O n at time t, represents the transmission power of the inter-regional and inter-provincial tie line k n under the transaction I n at time t; when n = 1, it is an inter-regional tie line, and when n = 2, it is an inter-provincial tie line;

[0108] The electricity transaction and the tie line are in an indirect correlation form. Specifically, the buyers and sellers in the inter-regional and inter-provincial markets conduct transactions through the transaction path, and the transaction path is formed by the corresponding tie line combination. When solving the relationship between the electricity transaction and the tie line power, it is necessary to decompose the transaction power to the tie line according to the specific implementation path of the transaction, and it is also necessary to consider the definition of the positive direction of the tie line and the flow direction of the transaction power of the buyers and sellers. Therefore, it also includes:

[0109]

[0110] Among them, is the correlation coefficient between the positive direction of the tie line k n and the actual transaction power flow direction, is the transaction power of each level of transaction behavior I n at time period t, is a variable from 0 to 1 and represents whether the transaction behavior I n is transmitted through the transaction path p, is a variable from 0 to 1 and represents whether the path p is composed of the tie line k n N p is the total number of transaction paths, is the inter-regional and inter-provincial tie line k n under the transaction I n at time t.

[0111]

Generator output constraints and positive and negative reserve constraints of the provincial dispatching center

[0112]

[0113]

[0114]

[0115] Among them, is the maximum output of thermal power unit i3 of the provincial dispatching center at time period t, The minimum output of thermal power unit i3 of the provincial dispatching center at time period t Denotes the group of thermal power units of the national dispatching center The maximum output at time period t Denotes the group of thermal power units of the national dispatching center The minimum output at time period t Denotes the group of thermal power units of the grid dispatching center The maximum output at time period t Denotes the group of thermal power units of the grid dispatching center The minimum output at time period t Denotes the group of thermal power units of the provincial dispatching center The maximum output at time period t The group of thermal power units of the provincial dispatching center The minimum output at time period t Denotes the maximum upward ramp rate of thermal power unit i1 of the national dispatching center Denotes the maximum downward ramp rate of thermal power unit i1 of the national dispatching center Denotes the maximum upward ramp rate of thermal power unit i2 of the grid dispatching center Denotes the maximum downward ramp rate of thermal power unit i2 of the grid dispatching center Denotes the maximum upward ramp rate of thermal power unit i3 of the provincial dispatching center Denotes the maximum downward ramp rate of thermal power unit i3 of the provincial dispatching center Denotes the start-stop status of thermal power unit i3 of the provincial dispatching center at time period t Indicates that thermal power unit i3 of the provincial dispatching center is shut down at time period t Indicates that thermal power unit i3 of the provincial dispatching center is started up at time period t Is the capacity of the directly dispatched hydroelectric unit h3 of the provincial dispatching center within the provincial dispatching scope a3 at time period t Denotes the minimum output of the directly dispatched hydroelectric unit h3 of the provincial dispatching center within the provincial dispatching scope a3 Denotes the deduction value of the unstable output of the unit at time period t Denotes the system positive reserve capacity requirement at time period t Denotes the system negative reserve capacity requirement at time period t Is the output of thermal power unit i3 of the provincial dispatching center within the provincial dispatching scope a3 at time period t Is the output of thermal power unit i1 of the grid dispatching center within region a1 at time period t Is the output of thermal power unit i2 of the grid dispatching center within provincial region a2 at time period t Is the output of thermal power unit i1 of the grid dispatching center within region a1 at time period t - 1 Is the output of thermal power unit i2 of the grid dispatching center within provincial region a2 at time period t - 1 Is the output of thermal power unit i3 of the provincial dispatching center within the provincial dispatching scope a3 at time period t - 1

[0116] In step S11, using the provincial load level characteristics, wind and solar power output characteristics, and various power source parameters; regional directly regulated unit parameters, inter-provincial tie-line parameters; national directly regulated unit parameters, inter-regional tie-line parameters as boundary conditions, respectively taking the minimum of the system operation cost and transmission cost at the national dispatching level, the minimum of the system operation cost and transmission cost at the network dispatching level, and the minimum of the system operation cost at the provincial dispatching level as the objective functions, considering the system load balance constraints at each level, the upper and lower limits of the unit output of "one unit with multiple transmissions", the transaction constraints of inter-regional and inter-provincial tie-lines, etc., generate the unit output data and tie-line transmission data within the entire network scope.

[0117] Step S12, construct provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the national grid-provincial multi-level power system collaborative dispatching model;

[0118] Equivalent aggregation is one of the effective methods to solve the ultra-large-scale planning optimization calculation, which involves network transformation, simplification and equivalence in power grid calculation. In this paper, equivalent aggregation is embedded to solve the national-grid-provincial multi-level collaborative balance. As Figure 2 shown, the provincial dispatching coordinates the resources such as the directly regulated units, wind power, photovoltaic power and energy storage within the province, calculates the net load of the province after pre-balancing, and equivalentizes it to the provincial node load. The network dispatching coordinates the resources such as the network-dispatching directly regulated units based on the provincial node loads of each province, conducts balance calculations considering power flow constraints, etc., and equivalentizes the regional net load to the regional node load. The national dispatching coordinates the resources such as the national-dispatching directly regulated thermal power units based on the regional node loads of each region, conducts balance calculations considering power flow constraints, etc.

[0119] Step S13, take the order of national, network, and province as the outer loop order of the structure of the simplified national grid-provincial multi-level power system collaborative dispatching model, and take the order of province, network, and national as the inner loop order of this structure, and solve the simplified national grid-provincial multi-level power system collaborative dispatching model based on the target cascade method to obtain the operation results of the multi-level power system collaborative dispatching.

[0120] Specifically, it includes: after determining the output of the provincial dispatching thermal power units i3 within the scope a3 of the provincial dispatching to be determined at time period t, judge whether the first absolute value of the load reverse relaxation variable and the load forward relaxation variable within area a1, and the second absolute value of the load forward relaxation variable and the load negative relaxation variable within provincial area a2 both meet the first preset constraint condition; if both meet, determine the system net load of area a1 at time period t; if not, update the penalty coefficient of the national grid-provincial multi-level power system collaborative dispatching model; after determining the system net load of area a1 at time period t, judge whether the first absolute value and the second absolute value both meet the second preset constraint condition; if they meet, judge whether the national grid-provincial multi-level power system collaborative dispatching model meets the global constraint condition; if not, update the penalty coefficient of the national grid-provincial multi-level power system collaborative dispatching model; if the global constraint condition is met, output the operation result of the multi-level power system collaborative dispatching, if not, update the index values of the inner loop structure and the outer loop structure. Specifically, it can be referred to Figure 3 , it should be noted that Figure 3 some characters are misaligned in and etc., please refer to the description in the specification.

[0121] The first preset constraint condition is that the absolute value of the difference in load relaxation variables between time zones / provinces for the outer loop balance pre-plan formulation is less than ε1; the second preset constraint condition is that the absolute value of the difference in load relaxation variables between time zones / provinces for the inner loop balance plan adjustment is less than ε2; the global constraint condition is the first preset constraint condition + the second preset constraint condition + economic optimality.

[0122] Under the equivalent aggregation theory, the original multi-level grid of the state grid-provincial network is simplified, but the model solution involves large-scale cross-provincial and cross-regional dispatching of resources. There are still many operating nodes and complex connection modes under the actual spatial scale. Therefore, the objective cascading analysis method is used for solution and Introduce consistency constraints so that the state dispatching, network dispatching, and provincial dispatching can still be solved independently while transmitting variables to each other. As Figure 3 shown, the multi-level collaborative optimization of the state grid-provincial network is specifically divided into two layers of optimization: the outer loop and the inner loop. The outer loop represents the top-down solution method of the state dispatching-network dispatching-provincial dispatching, and the inner loop represents the bottom-up solution method of the provincial dispatching-network dispatching-state dispatching in the loop. In the inner and outer loop iterations and overall optimization, the load relaxation variables need to meet certain convergence constraints to ensure that the multi-level collaborative balance of the state grid-provincial network reaches the optimal.

[0123] In summary, the present invention provides a method for collaborative dispatching and operation of a multi-level power system of the State Grid at the provincial level. The method includes: constructing a collaborative dispatching model for the multi-level power system of the State Grid at the provincial level according to the target requirements of the national dispatching, the target requirements of the network dispatching, the target requirements of the provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly dispatched units, the tie-line transaction constraints, the output constraints of the units at the provincial dispatching, and the positive and negative reserve constraints; constructing provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the collaborative dispatching model for the multi-level power system of the State Grid at the provincial level; taking the order of the national, network, and provincial levels as the outer loop order of the structure of the simplified collaborative dispatching model for the multi-level power system of the State Grid at the provincial level, and taking the order of the provincial, network, and national levels as the inner loop order of the structure, and solving the simplified collaborative dispatching model for the multi-level power system of the State Grid at the provincial level based on the target cascade method to obtain the collaborative dispatching and operation results of the multi-level power system. In the two-level collaborative dispatching between the national and network levels and between the network and provincial levels, the mutual aid potential across provinces and regions has not been fully explored. In the actual operation of the power grid, there are situations including dispatching plan factors and market factors in the cross-regional and cross-provincial tie-line channels. Most of the existing studies only consider the tie-line constraints at the sending and receiving ends, and do not consider the boundary condition adjustment brought by the influence of market factors in detail. There are cases where a single directly dispatched unit of the national dispatching and the network dispatching meets the multi-domain coordination balance. Most of the existing studies only consider the upper and lower limits of the output of the directly dispatched units, and do not consider the boundary condition adjustment brought by the influence of "one machine sending to multiple regions" in detail. The present invention constructs a national-network-provincial multi-level collaborative balance dispatching optimization model by taking into account the differences in hierarchical objectives and constraints and the actual influences of directly dispatched units and tie-lines, providing a reference for subsequent exploration of adapting to the multi-level collaborative dispatching mode of the State Grid at the provincial level. The present invention combines equivalent aggregation and the target cascade method to construct a solution method suitable for the multi-level collaborative optimization dispatching of the national-network-provincial levels, taking into account both the actual situation of the power grid and the internal mechanism at each level, and improving the solution efficiency of the optimal dispatching of the power system under the overall network collaboration. The present invention breaks through the limitation of the existing research that ignores the actual three-level collaborative dispatching of the national, network, and provincial levels in China and only constructs a two-layer collaborative optimization dispatching model from the perspective of two-level interconnection. In addition, in the model, it breaks through the limitation of only considering the upper and lower limits of the directly dispatched units and the transmission capacity constraints of the tie-lines in the existing dispatching model, and supplements the consideration of the actual situation of "one machine sending to multiple regions" of the directly dispatched units and the two-layer factors of market and dispatching included in the tie-line channels, and constructs a refined national-network-provincial multi-level collaborative dispatching optimization model considering the actual operation of the directly dispatched units and the tie-lines.

[0124] Based on the same inventive concept, the present invention provides a Figure 4 device for collaborative dispatching and operation of a multi-level power system of the State Grid at the provincial level as shown in

[0125] A model construction module 41, configured to construct a collaborative dispatching model for a multi-level power system of the State Grid at the provincial level according to the target requirements of the national dispatching, the target requirements of the network dispatching, the target requirements of the provincial dispatching, the load balance constraints at each level, the upper and lower limits of the output of multiple directly dispatched units, the tie-line transaction constraints, the output constraints of the units at the provincial dispatching, and the positive and negative reserve constraints;

[0126] A structure simplification module 42 is used to construct provincial equivalent aggregation nodes and network domain equivalent aggregation nodes to simplify the structure of the national grid provincial multi-level power system collaborative dispatching model.

[0127] An operation result module 43 is used to take the order of the state grid, network, and province as the outer loop order of the structure of the simplified national grid provincial multi-level power system collaborative dispatching model, and the order of province, network, and state grid as the inner loop order of the structure, and solve the simplified national grid provincial multi-level power system collaborative dispatching model based on the target cascade method to obtain the operation results of the multi-level power system collaborative dispatching.

[0128] Since the electronic device introduced in this embodiment is the electronic device used to implement the information processing method in the embodiments of the present invention, based on the information processing method introduced in the embodiments of the present invention, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the implementation of how this electronic device implements the method in the embodiments of the present invention will not be described in detail here. As long as the electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present invention belongs to the scope protected by the present invention.

[0129] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can 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.

[0130] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0131] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means embodying the function specified in one or more of the blocks and / or steps of the flowchart. Figure 1 one or more of the steps and / or blocks Figure 1 specified in one or more of the blocks and / or steps.

[0132] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions executed on the computer or other programmable apparatus provide steps for implementing the function specified in one or more of the blocks and / or steps of the flowchart. Figure 1 one or more of the steps and / or blocks Figure 1 specified in one or more of the blocks and / or steps.

[0133] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic inventive concept. Therefore, the appended claims are intended to be construed to cover the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0134] It is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for coordinated dispatching and operating a multi-level power system of a state grid and a province, characterized in that: The method comprises: According to the target requirements of national dispatching, grid dispatching, provincial dispatching, load balance constraints at all levels, upper and lower limits of multiple direct dispatching units, tie-line trading constraints, provincial dispatching unit output constraints, and positive and negative reserve constraints, a coordinated dispatching model for the national grid and provincial multi-level power system is constructed; Constructing provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the state grid provincial multi-level power system coordinated dispatching model; The order of country, grid and province is used as the outer loop order of the structure of the simplified national grid-provincial multi-level power system coordinated dispatching model, and the order of province, grid and country is used as the inner loop order of the structure. Based on the target cascading method, the simplified national grid-provincial multi-level power system coordinated dispatching model is solved to obtain the coordinated dispatching operation results of the multi-level power system.

2. A method for coordinated dispatching and operating a multi-level power system in a state grid and a province as claimed in claim 1, characterized in that: The goal is to minimize the system operation cost and transmission fee within the coordination scope of the National Regulator, including: Among them, min F1 is the minimum sum of system operation cost and transmission cost within the coordination scope of the national dispatching. The system operation costs within the coordination scope of the National Regulator, The inter-regional transmission costs within the coordination scope of the National Dispatching Authority. is the system operating cost of area a1, is the operating cost of the national dispatched thermal power unit i1 during period t, A Regi is the total number of regions within the scope of national coordination, T is the total number of operating hours in a day, is the output of the state-controlled thermal power unit i1 in area a1 during time period t, as well as are the unit operation cost function coefficients of the state-controlled thermal power unit i1, is the transmission power of the inter-regional tie line k1 in period t, is the total number of inter-district contact lines, is the transmission power of the inter-regional interconnection line k1 in period t.

3. A method for coordinated dispatching and operating a multi-level power system of a state grid and a province as claimed in claim 2, characterized in that: The target requirement is to minimize the system operation cost and transmission fee within the coordination scope of the grid dispatching, including: Among them, min F2 is the minimum sum of system operation cost and transmission cost within the coordination range of the grid dispatching. The system operation cost within the coordination scope of the network dispatching. is the cost of inter-provincial transmission of electricity. is the system operation cost of province a2 in the network survey, A Prov is the total number of provinces within the coordination scope of the network adjustment, is the operating cost of the grid-dispatched thermal power unit i2 during period t, as well as are the unit operation cost function coefficients of the grid-controlled thermal power unit i2, The output of thermal power unit i2 in the provincial a2 network during time period t is: It is the transmission fee of inter-provincial interconnection line. is the total number of inter-provincial contact lines, is the transmission power of the inter-provincial interconnection line k2 in period t.

4. A method for coordinated dispatching and operating a multi-level power system in a state grid and a province as claimed in claim 3, characterized in that: The target demand is to keep the system operating cost within the scope of provincial regulation, including: Among them, min F3 is the minimum operating cost of the system with low dispatching cost. To save system operating costs within the scope of adjustment, To save the operating cost of thermal power unit i3 in period t, f 2,t is the penalty fee for abandoning clean energy in period t within the scope of provincial regulation, f 3,t is the penalty fee for load loss during period t within the provincial dispatching range, is the total number of thermal power units dispatched by the province, is the total number of provincial dispatching independent energy storage within the scope a3 of provincial dispatching, In order to save the charging and discharging cost of independent energy storage es3 in time period t, as well as, All of them are the unit operation cost function coefficients of provincial dispatch thermal power unit i3. is the output of thermal power unit i3 in time period t within the range a3, c M Abandoning the penalty coefficient for clean energy, The total number of fans in the control range a3. is the abandoned wind power of the wind turbine w3 in the saving range a3 during time period t, is the total number of provincially-adjusted photovoltaics within the provincially-adjusted range a3, is the abandoned light power of photovoltaic v3 in the adjustment range a3 in time period t, c L is the load loss penalty coefficient, To save the load loss power at time t within the range a3, In order to save the charging cost of independent energy storage es3, In order to save the discharge cost of independent energy storage es3, To adjust the charging power of independent energy storage es3 in time period t within the adjustment range a3, The discharge power of the independent energy storage es3 in the time period t is adjusted within the adjustment range a3.

5. A method for coordinated dispatching and operating a multi-level power system of a state grid and a province as claimed in claim 4, characterized in that: Load balancing constraints at each level, including: in, is the net system load of area a1 in period t, is the sum of net loads of each province in time period t, is the output of thermal power unit i2 in region a1 during time period t, is the output of the national hydropower unit 1 in area a1 during period t, is the output of hydropower unit 2 in the area a1 in time period t, is the output of the network fan w2 in area a1 during time period t, is the output of the grid-adjusted photovoltaic v2 in area a1 during time period t, is the total number of thermal power units in area a1, is the total number of hydropower units dispatched by the state in region a1, is the total number of hydropower units in the area a1, is the total number of fans in the network of area a1, A is the total number of photovoltaic power generation in area a1, Regi The total number of regions within the scope of national coordination. is the positive slack variable of the load in region a1, is the load reverse relaxation variable in region a1, is the total number of inter-district contact lines, is the output of the state-controlled thermal power unit i1 in area a1 during period t; Also includes: in, is the net system load of province a2 in time period t, is the total system load of the province in time period t, is the output of thermal power unit i3 in province a2 during time period t, is the output of hydropower unit 2 in the provincial a2 network during time period t, is the output of hydropower unit 3 in province a2 during time period t, The output of fan w3 in the province a2 during time period t is: is the output of photovoltaic v3 in the province a2 during time period t, To adjust the charging power of independent energy storage es3 in time period t within province a2, To adjust the discharge power of independent energy storage es3 in time period t within province a2, is the total number of thermal power units dispatched within the province a2, is the total number of hydropower units in the provincial a2 network, is the total number of hydropower units in area a1, is the total number of fans in the province a2, It indicates the total number of photovoltaic power plants in province a2. It indicates the total number of independent energy storage in province a2. is the positive relaxation variable of the load in province a2, is the reverse relaxation variable of the load in province a2, is the total number of inter-provincial contact lines, A Prov is the total number of provinces within the coordination scope of the network adjustment, The output of thermal power unit i2 in time period t is adjusted for the provincial a2 internal network; Also includes: in, represents the output of the provincial hydropower unit 3 in the provincial dispatching range a3 in time period t, T k,t represents the transmission power of the inter-regional and inter-provincial contact line k at time t within the provincial dispatch range a3, It indicates the output of the fan w3 in the time period t within the range a3. It indicates the output of photovoltaic v3 in the time period t within the range a3. It represents the charging power of the independent energy storage es3 in the adjustment range a3 during the time period t. It represents the discharge power of the independent energy storage es3 in the saving range a3 during the time period t, Indicates the number of hydropower units in the provincial dispatch range a3; N k represents the total number of inter-regional and inter-provincial contact lines k within the provincial dispatching range a3, is the total number of thermal power units dispatched by the province, is the total number of provincial dispatching independent energy storage within the scope a3 of provincial dispatching, The total number of fans in the control range a3. The total number of fans in the control range a3. To adjust the output of thermal power unit i3 in time period t within the range a3, is the total system load of the province in time period t.

6. A method for coordinated dispatching and operating a multi-level power system in a state grid and a province as claimed in claim 5, characterized in that: Multiple direct-controlled unit output upper and lower limit constraints, including: in, represents the output ratio of the national thermal power unit i1 to region a1, A1 represents the total number of regions supplied by the national thermal power unit i1, is the output of the state-controlled thermal power unit i1 in area a1 during period t, is the minimum output of the state-controlled thermal power unit i1 in area a1 during period t, is the maximum output of the state-controlled thermal power unit i1 in area a1 during time period t; Also includes: in, represents the output ratio of the thermal power unit i2 dispatched by the grid to the province a2, A2 represents the total number of supply areas of the thermal power unit i2 dispatched by the grid, The output of thermal power unit i2 in the provincial a2 network during time period t is: is the minimum output of the grid-dispatched thermal power unit i2 in time period t, It is the maximum output of the grid-dispatched thermal power unit i2 in time period t.

7. A method for coordinated dispatching and operating a multi-level power system in a state grid and a province as claimed in claim 6, characterized in that: Tie line transaction constraints include: in, Indicates the inter-regional and inter-provincial contact line k n The transmission power at time t is Indicates the inter-regional and inter-provincial contact line k n Plan O at time t n The transmission power under Indicates the inter-regional and inter-provincial contact line k n Trading I at time t n When n=1, it is an inter-regional interconnection line; when n=2, it is an inter-provincial interconnection line; Also includes: in, is the contact line k n The correlation coefficient between the positive direction and the actual transaction power flow direction, For each level of transaction behavior I n The trading power in period t, A variable between 0 and 1 represents a transaction behavior. n Whether it is transmitted via transaction path p, is a variable between 0 and 1 and indicates whether path p is connected by tie line k. n Composition, N p is the total number of transaction paths, It is a cross-region and cross-provincial contact line k n Trading I at time t n The transmission power under .

8. A method for coordinated dispatching and operating a multi-level power system in a state-owned power grid and a province as claimed in claim 7, characterized in that: The provincial dispatch unit output constraints and positive and negative reserve constraints include: in, is the maximum output of the thermal power i3 in time period t, is the minimum output of the thermal power i3 in time period t, Indicates the national dispatched thermal power plant group The maximum output in time period t, Indicates the national dispatched thermal power plant group The minimum output in time period t, Indicates the network dispatching thermal power generation group The maximum output in time period t, Indicates the network dispatching thermal power generation group The minimum output in time period t, Indicates provincial dispatch thermal power generation group The maximum output in time period t, Provincial dispatch thermal power plant group The minimum output in time period t, Indicates the maximum ramp rate of the state-controlled thermal power unit i1, Indicates the maximum ramp rate of the state-controlled thermal power unit i1. Indicates the maximum ramp rate of the grid-controlled thermal power unit i2, Indicates the maximum ramp-down rate of the grid-controlled thermal power unit i2, Indicates the maximum ramp rate of provincial dispatch thermal power unit i3, It indicates the maximum down-climbing rate of provincial dispatching thermal power unit i3. Indicates the start and stop status of the provincial thermal power unit i3 in time period t, When it means that the provincial dispatching thermal power unit i3 is shut down in time period t, It means that the provincial dispatching thermal power unit i3 is started in time period t. is the capacity of the provincial dispatching and direct dispatching hydropower unit h3 in the provincial dispatching range a3 during the time period t, It indicates the minimum output of the provincial direct-adjustment hydropower unit h3 within the provincial adjustment range a3. Indicates the deduction value of unstable output of the unit in period t, represents the system positive reserve capacity requirement for time period t, represents the system negative reserve capacity requirement for time period t, To adjust the output of thermal power unit i3 in time period t within the range a3, is the output of thermal power unit i1 in region a1 during time period t, The output of thermal power unit i2 in the provincial a2 network during time period t is: is the output of thermal power unit i1 in region a1 during period t-1, is the output of thermal power unit i2 in the provincial a2 intra-network during time period t-1, The output of thermal power unit i3 in time period t-1 is adjusted within the range a3.

9. A method for coordinated dispatching and operating a multi-level power system in a state grid and a province as claimed in claim 1, characterized in that: Based on the target cascading method, the simplified coordinated dispatch model of the state grid and provincial multi-level power system is solved, and the coordinated dispatch operation results of the multi-level power system are obtained, including: After determining the output of the provincial dispatch thermal power unit i3 in the provincial dispatch range a3 in the time period t, determine whether the first absolute value of the load reverse slack variable in the region a1 and the load positive slack variable in the region a1, and the second absolute value of the load positive slack variable in the region a2 and the load negative slack variable in the region a2 all meet the first preset constraint condition; If all conditions are met, the net system load of area a1 in time period t is determined; if not, the penalty coefficient of the coordinated dispatch model of the state grid and provincial multi-level power system is updated; After determining the system net load of area a1 in time period t, determining whether the first absolute value and the second absolute value both satisfy the second preset constraint condition; If satisfied, then determine whether the coordinated dispatch model of the State Grid's provincial multi-level power system meets the global constraint conditions; if not satisfied, then update the penalty coefficient of the coordinated dispatch model of the State Grid's provincial multi-level power system; If the global constraints are met, the results of the coordinated dispatching of the multi-level power system are output; if not, the index values ​​of the inner and outer loop structures are updated.

10. A coordinated dispatching and operating device for a multi-level power system in a state grid or province, characterized in that: The device comprises: The model building module is used to build a coordinated dispatch model for the multi-level power system of the State Grid and the Province according to the target requirements of the National Dispatching Authority, the target requirements of the Grid Dispatching Authority, the target requirements of the Provincial Dispatching Authority, the load balance constraints at all levels, the upper and lower limits of the output of multiple direct-dispatching units, the tie-line transaction constraints, the output constraints of provincial dispatching units, and the positive and negative reserve constraints; A structure simplification module, used to construct provincial equivalent aggregation nodes and network equivalent aggregation nodes to simplify the structure of the state grid provincial multi-level power system collaborative dispatching model; The operation result module is used to use the order of country, grid, and province as the outer loop order of the structure of the simplified national grid-provincial multi-level power system coordinated dispatching model, and the order of province, grid, and country as the inner loop order of the structure, and solve the simplified national grid-provincial multi-level power system coordinated dispatching model based on the target cascading method to obtain the multi-level power system coordinated dispatching operation results.

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