Active coordination control method and device suitable for source-grid-load-storage integrated power grid

Abstract

The invention discloses an active power coordination control method and device suitable for a source-grid-load-storage integrated power grid, and the method comprises the steps: carrying out the partitioning and grouping of a whole network, monitoring the frequency of the power grid, calculating the adjustable active power of source-grid-load-storage resources, and taking the fastest adjustment response speed, the minimum adjustment loss and the minimum adjustment cost of each resource group as positive ideal solutions. Determining the priority of each resource group participating in adjustment by adopting a comprehensive evaluation ideal solution; and carrying out active distribution of source network load storage resources on each group in sequence according to the priority. According to the method provided by the invention, the rapid characteristic of power electronic equipment, the charging and discharging loss of energy storage, the action loss of a fan and a conventional unit and the power supply stability of a load are fully considered, priorities are reasonably set for various adjustment resources, and photovoltaic, energy storage, the fan, the conventional unit and the load are sequentially adjusted; the method gives consideration to the rapid and flexible adjustment, the economical efficiency of unit wear and the stability of load power supply, effectively improves the frequency response characteristic, greatly enhances the adjustment capability of an integrated power grid, and reduces the configuration and investment of active resources.

Description

Technical Field

[0001] The present invention relates to the field of active power coordinated control of electric power systems, and in particular to an active power coordinated control method and device suitable for a power grid with integrated source, grid, load and storage. Background Art

[0002] In order to solve the system balance problems caused by the randomness, volatility and seasonal imbalance of renewable energy generation, it is necessary to rely on multi-time scale energy storage technology. Energy storage has become a standard configuration of renewable energy stations, and the grid form has gradually changed from the three elements of "source, grid and load" to the four elements of "source, grid, load and storage". The voltage level of the integrated grid of source, grid, load and storage is relatively high. The grid contains various types of adjustable resources such as load, wind turbine, photovoltaic, energy storage, conventional units, etc., and multiple types of primary energy are coupled with each other. The geographical distribution range is wide, the proportion of new energy is high, and the energy storage configuration is relatively small. According to whether the integrated grid of source, grid, load and storage is connected to the large grid, it can be divided into three operating modes: strong connection with the large grid, weak connection with the large grid and isolated grid. The basis of the conventional large grid control mode is that conventional power sources occupy a dominant position, and the electromechanical coupling characteristics of synchronous machines and the self-synchronization characteristics within a certain range are used to maintain the stable operation of the grid. There is no need to interfere with the primary frequency and voltage regulation process. Only in the case of serious faults, multi-resource coordination is carried out through the stabilization control device, or coordinated and optimized operation is achieved through the dispatching system on a long time scale. In conventional microgrids, wind power and photovoltaic power account for a small proportion, and a large amount of energy storage is configured. When connected to the grid, distributed renewable energy operates in constant power mode; when isolated, it generally adopts master-slave control mode, and energy storage adopts V / F (voltage / frequency) control. The large power grid and large-capacity energy storage support the voltage and frequency stability of the microgrid in grid-connected and off-grid operation, respectively, without the need to coordinate new energy sources such as wind and light. The source-grid-load-storage integrated power grid is different from the traditional large power grid and the existing microgrid operation mode. The grid regulation capacity is weak, and the proportion of conventional units and energy storage is low, which is not enough to smooth out grid disturbances. It is necessary to fully tap the regulation resources in the grid. However, in the existing technology, a large number of control resources cannot be uniformly coordinated and controlled. Due to the errors in the measurement link, the delay in the control link, and the differences in the time scales of the actions of different types of execution units, it is very easy to cause the actuators of each control object to "compete" with each other and repeatedly act, causing stability problems such as grid oscillation. Therefore, how to maintain the safe, stable and green economic operation of the power grid through resource allocation and regulation technology is the top priority of its application and development.

[0003] Moreover, in the existing technology, for new energy systems such as wind turbines and photovoltaics, active power control only involves the optimization research of a single new energy unit, and does not comprehensively consider the coordinated control between a large number of wind turbines, photovoltaics, energy storage, conventional units, and loads. In particular, no targeted solutions have been proposed for the frequency fluctuations and active power imbalance problems of the integrated source-grid-load-storage power grid. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an active power coordination control method and device suitable for a source-grid-load-storage integrated power grid, which incorporates wind turbines, photovoltaics, energy storage, conventional units and loads into a unified coordination range, avoids oscillation problems caused by multiple control objects, and ensures safe and stable operation of the power grid.

[0005] The present invention adopts the following technical solution.

[0006] The present invention proposes an active power coordinated control method applicable to a source-grid-load-storage integrated power grid, comprising:

[0007] Step 1: Partition and group the entire network, including:

[0008] The whole network is divided into zones according to the geographical locations of the source, grid, load and storage resources of the whole network, and each zone is divided into resource groups according to the types of source, grid, load and storage resources; the devices with active power control capability in each resource group are used as elements of each resource group;

[0009] Step 2, grid frequency monitoring, includes:

[0010] Real-time monitoring of the grid frequency and frequency change rate. When the grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active power coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and is outside the safe operating frequency range of the grid frequency, the steady-state active power control is started;

[0011] Step 3, calculating the adjustable active power of source, grid, load and storage resources, including:

[0012] Determine the active power regulation limit of each element according to the real-time active power output of each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable amount of each element, and the sum of the active power adjustable amounts of each element in the resource group as the active power adjustable amount of each resource group;

[0013] Step 4: Taking the resource group with the fastest regulation response speed, the least regulation loss and the smallest regulation cost as the positive ideal solution, a comprehensive evaluation ideal solution is used to determine the priority of each resource group participating in the regulation; the active power of source, grid, load and storage resources is allocated to each group in turn according to the priority.

[0014] The same partition is divided into photovoltaic groups, wind turbine groups, energy storage groups, conventional groups and load groups according to resource types.

[0015] According to national standards and the actual operation requirements of the source-grid-load-storage integrated power grid, the transient target control frequency dead zone f is set. d , the threshold value f of the frequency change rate m And the upper and lower limits of safe operating frequency f su 、f sl ;

[0016] The safe operating frequency range of the power grid frequency is [f sl ,f su ].

[0017] In step 3, the active power regulation limit includes the upper and lower limits of active power regulation, as follows:

[0018] 1) Photovoltaic group: Active power regulation upper limit meets P ei1j =U m ×I m , the lower limit of active power regulation satisfies P ei1j =0; where the maximum operating point voltage U of the photovoltaic inverter is calculated based on the light intensity. m , Maximum operating point current I m ;

[0019] 2) Fan unit: Active power regulation upper limit is met The lower limit of active power regulation satisfies P ei2h =0; where C p is the wind energy utilization coefficient, β is the blade pitch angle, λ is the blade tip speed ratio, v is the wind speed, R is the rotor radius, and ρ is the air density;

[0020] 3) Energy storage group: Active power regulation upper limit meets P ei3k =P mi3k , the lower limit of active power regulation satisfies P ei3k =-P mi3k ; Among them, P mi3k is the maximum power of the energy storage inverter; when the energy storage charge state is higher than the set upper limit or lower than the set lower limit, it cannot be charged or discharged. At this time, the active power adjustment upper or lower limit P of the energy storage element ei3k =0;

[0021] 4) Conventional units: Active power regulation upper limit meets P ei4g =P i4g ×(1+g 1 ), the lower limit of active power regulation satisfies P ei4g =P i4g ×(1-g 2 ); Among them, the maximum upward frequency regulation capability of conventional units is g 1 , Maximum downward adjustment capacity g 2 ;

[0022] 5) Load group: Active power regulation upper limit meets P ei5q =P mi5q , the lower limit of active power regulation satisfies P ei5q =P li5q ; Among them, the maximum operating power of the adjustable load P mi5q , the minimum operating power is P li5q .

[0023] The adjustable active power of each element satisfies the following relationship:

[0024] P i1j =P ei1j -P fi1j

[0025] P i2h =P ei2h -P fi2h

[0026] P i3k =P ei3k -P fi3k

[0027] P i4g =P ei4g -P fi4g

[0028] P i5q =P ei5q -P fi5q

[0029] In the formula, the active outputs of the jth inverter of the PV group in the i-th zone, the hth inverter of the wind turbine group, the kth inverter of the energy storage group, the gth unit of the conventional unit, and the qth load of the load group are P respectively. i1j , P i2h , P i3k , P i4g , P i5q , the active power regulation limits are P ei1j , P ei2h , P ei3k , P ei4g , P ei5q , the adjustable active power is P fi1j , P fi2h , P fi3k , P fi4g , P fi5q .

[0030] The active adjustable quantities of the photovoltaic group, wind turbine group, energy storage group, conventional group, and load group in the i-th zone satisfy the following relationships:

[0031] P fi1 =∑P fi1j (j=1~n i1 )

[0032] P fi2 =∑P fi2h (h=1~n i2 )

[0033] P fi3 =∑P fi3k (k=1~ni3 )

[0034] P fi4 =∑P fi4g (g=1~n i4 )

[0035] P fi5 =∑P fi5q (q=1~n i5 )

[0036] Where P fi1 , P fi2 , P fi3 , P fi4 , P fi5 They are the active adjustable quantities of the photovoltaic group, wind turbine group, energy storage group, conventional unit, and load group in the i-th zone. The photovoltaic group contains n i1 PV inverter elements, and the wind turbine group contains n i2 wind turbine inverter elements, the energy storage group contains n i3 Energy storage inverter elements, conventional units contain n i4 There are n generator group elements, and the load group contains n i5 load element.

[0037] In step 4, according to the priority of each resource group participating in the regulation and the relationship between the total active power required to be adjusted in the whole network and the total adjustable active power of each group, the active power instructions of each group are determined in turn; according to the active power instructions of each group and the proportion of the active power adjustable amount of each group in each area in the total adjustable active power of the whole group, the active power instructions of each group in each area are determined; according to the active power instructions of each group in each area and the proportion of the active power adjustable amount of each element in each group in each area in the active power adjustable amount of each group in each area, the active power instructions of each element in each group in each area are determined to carry out active coordinated control of the integrated power grid of source, grid, load and storage.

[0038] Step 4 includes:

[0039] Step 4.1, calculate the total adjustable active power of the photovoltaic group, wind turbine group, energy storage group, conventional unit and load group in the whole network, and satisfy the following relationship:

[0040] P f1 =∑P fi1

[0041] P f2 =∑P fi2

[0042] P f3 =∑P fi3

[0043] P f3 =∑P fi3

[0044] Where P f1 , P f2 , P f3 , P f4 , P f5 They are the total adjustable active power of the photovoltaic group, wind turbine group, energy storage group, conventional unit and load group in the whole network;

[0045] The total amount of active power required to be adjusted in the whole network P x , satisfying the following relationship:

[0046] P x =Δf×K f

[0047] Where Δf is the frequency deviation, K f is the frequency modulation coefficient;

[0048] Step 4.2: If the total amount of active power required meets |P x |≤|P f1 |, then the whole network only adjusts active power through the PV group, and the active power instruction of the PV group is the total active power required to be adjusted in the whole network;

[0049] Step 4.3, if the total amount of active power to be adjusted satisfies |P f1 |<|P x |≤|P f1 +P f3 |, the whole network first adjusts the active power through the PV group, and then adjusts the active power through the energy storage group; the active power command of the PV group is the upper limit of the active power regulation, and the active power command of the energy storage group is the difference between the total active power required to be adjusted in the whole network and the upper limit of the active power regulation of the PV group;

[0050] Step 4.4, if the total amount of active power to be adjusted satisfies |P f1 +P f3 |<|P x |≤|P f1 +P f2 +P f3 |, the whole network first adjusts the active power through the PV group, then adjusts the active power through the energy storage group, and finally adjusts the active power through the wind turbine group; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, and the active power command of the wind turbine group is the difference between the total active power required to be adjusted in the whole network and the upper limits of active power regulation of the PV group and the upper limits of active power regulation of the energy storage group;

[0051] Step 4.5: If the total amount of active power required meets |P f1 +P f2 +P f3 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5|, the whole network first adjusts the active power through the PV group, then through the energy storage group, then through the wind turbine group, and finally through the conventional unit; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, the active power command of the wind turbine group is the upper limit of active power regulation, and the active power command of the conventional unit is the difference between the total active power required to be adjusted in the whole network and the upper limit of active power regulation of the PV group, the upper limit of active power regulation of the energy storage group, and the upper limit of active power regulation of the wind turbine group;

[0052] Step 4.6, if the total amount of active power to be adjusted satisfies |P f1 +P f2 +P f3 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5 |, the whole network first adjusts the active power through the PV group, then through the energy storage group, then through the wind turbine group, then through the conventional unit, and finally through the load group; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, the active power command of the wind turbine group is the upper limit of active power regulation, the active power command of the conventional unit is the upper limit of active power regulation, and the active power command of the load group is the difference between the total active power required to be adjusted in the whole network and the upper limits of active power regulation of the PV group, the upper limits of active power regulation of the energy storage group, the upper limits of active power regulation of the wind turbine group, and the upper limits of active power regulation of the conventional unit.

[0053] In step 4.2, the active power command of each PV inverter in the PV group is ΔP i1j =ΔP i1 ×P fi1j / P fi1 .

[0054] In step 4.3, each inverter in the PV group is adjusted to the active limit value P ei1j After that, the energy storage group distributes the insufficient active power according to the adjustable active power ratio of each inverter in the group. The active power command ΔP of the energy storage group i3 =(P x -P f1 )×P fi3 / P f3 , the active power command of each energy storage inverter in the group is ΔP i3k =ΔP i3 ×P fi3k / P fi3 .

[0055] In step 4.4, each inverter in the PV group is adjusted to the active limit value P ei1j And each inverter in the energy storage group is adjusted to the active limit value P ei3kAfter that, the part with insufficient active power to be adjusted will be distributed by the wind turbine group according to the adjustable active power ratio of each inverter in the group. The active power command of each zone wind turbine group is ΔP i2 =(P x -P f1 -P f3 )×P fi2 / P f2 , the active power command of each wind turbine inverter in the group is ΔP i2h =ΔP i2 ×P fi2h / P fi2 .

[0056] In step 4.5, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h The part of the total active power required to be adjusted that is insufficient is distributed by the conventional units according to the active power adjustable ratio of each unit in the group. The active power instruction of each conventional unit is ΔP i4 =(P x -P f1 -P f2 -P f3 )×P fi4 / P f4 , the active power command of each conventional unit is ΔP i4g =ΔP i4 ×P fi4g / P fi4 .

[0057] In step 4.6, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g The part of the total active power required to be adjusted that is insufficient is distributed by the load group according to the active power adjustable ratio of each adjustable load in the group. The active power instruction of each load group is ΔP i5 =(P x -P f1 -P f2 -P f3 -P f4 )×P fi5 / P f5 , each adjustable load active power command is ΔP i5q =ΔP i5 ×P fi5q / P fi5 .

[0058] In step 4.7, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g , and the adjustable loads in the load group are all adjusted to the active power limit value P ei5q When the adjustable active power of photovoltaic, wind turbine, energy storage, conventional units and load is insufficient, the long-term active power control mode is activated.

[0059] The present invention also proposes an active coordination control device suitable for a source-grid-load-storage integrated power grid, including: a whole-grid partitioning and grouping module, a power grid frequency monitoring module, a source-grid-load-storage resource adjustable active power calculation module, and a source-grid-load-storage resource active power allocation module;

[0060] The whole network partitioning and grouping module is used to partition the whole network according to the geographical location of the source, grid, load and storage resources of the whole network, and divide the same partition into resource groups according to the type of source, grid, load and storage resources; the equipment with active control capability in each resource group is used as the element of each resource group;

[0061] The power grid frequency monitoring module is used to monitor the power grid frequency and frequency change rate in real time. When the power grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active power coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and is outside the safe operating frequency range of the power grid frequency, the steady-state active power control is started;

[0062] The source-grid-load-storage resource adjustable active power calculation module is used to determine the active power regulation limit of each element according to the real-time active power output of each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable amount of each element, and the sum of the active power adjustable amounts of each element in the resource group as the active power adjustable amount of each resource group;

[0063] The active power allocation module of source, grid, load and storage resources is used to determine the priority of each resource group participating in the regulation by adopting a comprehensive evaluation ideal solution, taking the fastest regulation response speed, the least regulation loss and the lowest regulation cost of each resource group as the positive ideal solution; and allocates the active power of source, grid, load and storage resources to each group in turn according to the priority.

[0064] The beneficial effect of the present invention is that, compared with the prior art, the method proposed in the present invention fully taps the active and adjustable resources of the integrated power grid of source, grid, load and storage, realizes the friendly coordinated interaction of photovoltaics, wind turbines, conventional units, energy storage and adjustable loads, effectively improves the frequency response characteristics, greatly enhances the regulation capability of the integrated power grid, and reduces the configuration and investment of active resources. In a high-proportion source, grid, load and storage project in the northwest, by fully tapping the regulation resources of wind power, photovoltaics and loads, the energy storage configuration was reduced by 40%, which has good economic efficiency.

[0065] The method proposed in the present invention involves coordinated control of multiple types and quantities of regulation resources, and carries out unified optimization allocation based on the real-time regulation capability feedback of various resource objects and the grid frequency deviation, so as to avoid grid power oscillation caused by errors in the measurement links of multiple control objects and delays in the control links, and improve the level of safe and stable operation.

[0066] The method proposed in the present invention fully considers the rapid characteristics of power electronic equipment, the charging and discharging losses of energy storage, the operation losses of fans and conventional units, and the power supply stability of loads, reasonably sets priorities for various adjustment resources, and adjusts photovoltaics, energy storage, fans, conventional units and loads in turn, taking into account the rapid flexibility of adjustment, the economy of unit wear and the stability of load power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A flow chart of an active power coordination control method applicable to a source-grid-load-storage integrated power grid proposed by the present invention;

[0068] Figure 2 It is a logic diagram of the active power instruction allocation algorithm based on the multi-resource coordinated control optimization principle in an example of the present invention. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0070] The present invention proposes an active power coordinated control method suitable for a source-grid-load-storage integrated power grid. Figure 1 As shown, including:

[0071] Step 1: Partition and group the entire network:

[0072] The entire network is partitioned according to the geographical locations of its source, grid, load and storage resources. The same partition is divided into resource groups according to the types of source, grid, load and storage resources. The devices with active control capabilities in each resource group are used as elements of each resource group.

[0073] Specifically, the entire network is partitioned according to the geographical distribution of the source, grid, load and storage resources in the network. Resources with similar geographical locations are divided into the same partition, and the entire network is divided into m zones. The reason for partitioning by geographical location distribution is that the integrated coordinated control of source, grid, load and storage involves the unified scheduling of a large number of resource elements. By building regional control master stations according to geographical locations, the overall control architecture is clearer and more specific, avoiding the issuance of too complicated control instructions and facilitating the construction of the control communication network.

[0074] Specifically, the same partition is divided into photovoltaic groups, wind turbine groups, energy storage groups, conventional groups and load groups according to resource types. The reason for grouping resources is that different types of resource controllers have different adjustment speeds, different adjustable limits, and different adjustment priorities. i1 PV inverter elements, and the wind turbine group contains n i2 wind turbine inverter elements, the energy storage group contains n i3 Energy storage inverter elements, conventional units contain n i4 There are n generator group elements, and the load group contains n i5 load elements, then the jth inverter of the PV group in the i-th zone, the hth inverter of the wind turbine group, the kth inverter of the energy storage group, the gth unit of the conventional unit, and the qth load of the load group are M respectively. i1j 、M i2h 、M i3k 、M i4g 、M i5q , where i = 1, 2, ..., m, j = 1, 2, ..., n i1 ,h=1,2,…n i2 , k=1,2,…n i3 , g=1,2,…n i4 , q=1,2,…n i5 .

[0075] Step 2: Grid frequency monitoring:

[0076] Real-time monitoring of the grid frequency and frequency change rate. When the grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and the grid frequency is outside the safe operating frequency range, the steady-state active control is started.

[0077] Specifically, the transient target control frequency dead zone f is set according to national standards and the actual operation requirements of the source-grid-load-storage integrated power grid. d, frequency change rate threshold value f m And the upper and lower limits of safe operating frequency f su 、f sl The frequency operating range given in the relevant standards is related to the scale of the power grid. The frequency operating range of the integrated power grid of source, grid, load and storage should be flexibly set in combination with the actual demand of the power grid load.

[0078] Among them, the transient target control frequency dead zone f d The setting of frequency change rate threshold value f should be considered comprehensively in the actual grid operation situation. If it is set too large, the frequency regulation effect will be poor; if it is set too small, the regulation object will act too frequently. m A certain delay is required to avoid the impact of accidental disturbances in the system. d And the frequency change rate exceeds the threshold value f m , start the active power coordinated control of multiple resources; when the frequency change rate is less than the threshold value f m And the grid frequency is within the safe operating frequency range [f sl ,f su ], start steady-state active power control. At this time, the frequency deviation is large, and long-term active power control methods such as secondary frequency regulation, tertiary frequency regulation, and change of operation mode should be started to maintain the grid frequency in a safe operating range.

[0079] Step 3: Calculate the adjustable active power of source, grid, load and storage resources:

[0080] Determine the active power regulation limit of each element according to the active power output constraint conditions corresponding to each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable quantity of each element; the sum of the active power adjustable quantities of each element in the resource group is used as the active power adjustable quantity of each resource group.

[0081] The active outputs of the jth inverter of the PV group in the i-th zone, the hth inverter of the wind turbine group, the kth inverter of the energy storage group, the gth unit of the conventional unit, and the qth load of the load group are P respectively. i1j , P i2h , P i3k , P i4g , P i5q , the active power regulation limits are P ei1j , P ei2h , P ei3k , P ei4g , P ei5q , the adjustable active power is P fi1j , P fi2h , P fi3k , P fi4g , P fi5q , and satisfy the following relationship:

[0082] P i1j =P ei1j -P fi1j

[0083] P i2h =P ei2h -P fi2h

[0084] P i3k =P ei3k -P fi3k

[0085] P i4g =P ei4g -P fi4g

[0086] P i5q =P ei5q -P fi5q

[0087] Specifically, according to the real-time active output of a single element, the active regulation limit of each element can be calculated respectively, taking the groups in the i-th zone as an example, including:

[0088] 1) Photovoltaic group: Photovoltaic group: Photovoltaic is connected to the grid through an inverter. The active output limit is mainly affected by the light factor. The maximum operating point voltage U of the photovoltaic inverter is calculated based on the light. m , Maximum operating point current I m , the upper limit of active power regulation satisfies P ei1j =U m ×I m , the lower limit of active power regulation satisfies P ei1j =0;

[0089] 2) Fan unit: According to aerodynamics, the upper limit of active power regulation meets The lower limit of active power regulation satisfies P ei2h =0; where C p is the wind energy utilization coefficient, β is the blade pitch angle, λ is the blade tip speed ratio, v is the wind speed, R is the rotor radius, and ρ is the air density;

[0090] 3) Energy storage group: Energy storage is connected to the grid through an inverter, subject to the maximum power P of the energy storage inverter mi3k Constraint, the upper limit of active power regulation satisfies P ei3k =P mi3k , the lower limit of active power regulation satisfies P ei3k =-P mi3k ; When the energy storage charge state is higher than the set upper limit or lower than the set lower limit, it cannot be charged or discharged. At this time, the active power adjustment upper or lower limit P of the energy storage element ei3k =0;

[0091] 4) Conventional units: Conventional units are limited by regulation capacity, operation economy and other constraints, and their maximum upward frequency regulation capacity is g 1 , maximum downward adjustment capacity g 2 , the upper limit of active power regulation satisfies P ei4g =P i4g ×(1+g 1 ), the lower limit of active power regulation satisfies P ei4g =P i4g ×(1-g 2 );

[0092] 5) Load group: The load group is subject to constraints such as adjustment capacity and operation economy. The maximum operating power P of the adjustable load mi5q , the minimum operating power is P li5q , the upper limit of active power regulation satisfies P ei5q =P mi5q , the lower limit of active power regulation satisfies P ei5q =P li5q .

[0093] Specifically, according to the active adjustable limit of a single element, the active adjustable amount of each group in the partition is calculated. Taking the i-th zone as an example, the active adjustable amounts of the photovoltaic group, wind turbine group, energy storage group, conventional group, and load group are P fi1 , P fi2 , P fi3 , P fi4 , P fi5 , respectively satisfying the following relations:

[0094] P fi1 =∑P fi1j (j=1~n i1 )

[0095] P fi2 =∑P fi2h (h=1~n i2 )

[0096] P fi3 =∑P fi3k (k=1~n i3 )

[0097] P fi4 =∑P fi4g (g=1~n i4 )

[0098] P fi5 =∑P fi5q (q=1~n i5 )

[0099] Step 4: Taking the resource group with the fastest regulation response speed, the least regulation loss and the smallest regulation cost as the positive ideal solution, a comprehensive evaluation ideal solution is used to determine the priority of each resource group participating in the regulation; the active power of source, grid, load and storage resources is allocated to each group in turn according to the priority.

[0100] The comprehensive evaluation of ideal solutions includes data preprocessing, calculating positive and negative ideal solutions, calculating the distance between each solution and each ideal solution, and calculating the ranking index value. Specifically, it includes:

[0101] Obtain the indicators of regulation response speed, regulation loss and regulation cost of each resource group, and determine the standard decision matrix of each indicator by using the vector programming method according to the provisions of relevant power grid specifications; define the weight vector according to the relevant dispatching regulations, construct the weighted standard matrix using the standard decision matrix and the weight vector, and solve the weighted standard matrix to obtain the positive ideal solution and the negative ideal solution, where the positive ideal solution is the optimal solution for all indicators, and the negative ideal solution is the solution where any indicator does not reach the optimal level; calculate the distances from different resource group response sequence schemes to the positive ideal solution and the negative ideal solution; use the ratio of the negative ideal solution to the sum of the positive and negative ideal solutions as the sorting index of the resource group response sequence scheme, and use the resource group response sequence scheme corresponding to the maximum value of the sorting index as the optimal scheme, and determine the priority of each resource group in participating in the regulation according to the response order of each resource group in the optimal scheme.

[0102] According to the frequency deviation Δf and frequency modulation coefficient K f , calculate the total amount of active power required for the entire network using the following relationship:

[0103] P x =Δf×K f

[0104] Active power instructions are distributed according to the principle of coordinated control optimization of source, grid, load and storage resources until the grid frequency deviation is adjusted to within the transient target control frequency dead zone or the total adjustable active power in the grid has reached its regulation limit.

[0105] In a non-limiting preferred embodiment, based on the results of the full life cycle economic analysis, the priority of each group participating in the regulation is from high to low: photovoltaic group, energy storage group, wind turbine group, conventional unit, and load group. The reason is that photovoltaics, as a power electronic control device, has a fast regulation speed; energy storage has a fast regulation speed, but the number of energy storage charge and discharge times affects the lifespan; wind turbines and conventional units have large inertia links, slow regulation speeds, and certain mechanical losses; load regulation affects the reliability of power supply and has the lowest priority.

[0106] Specifically, active power command allocation is carried out according to the principle of multi-resource optimization and coordinated control optimization. Photovoltaic and energy storage have fast adjustment speed, the number of energy storage charge and discharge has an impact on life, mechanical wear of wind turbines and conventional units, and power adjustment that minimizes loads. The control principles are allocated by comprehensively considering the above factors. Taking the groups in the i-th zone as an example, Figure 2 As shown, including:

[0107] 1) Calculate the total adjustable active power of the photovoltaic group, wind turbine group, energy storage group, conventional unit and load group of the whole network, which are P f1 , P f2 , P f3 , P f4 , P f5 , satisfying the following relationship:

[0108] P f1 =∑P fi1

[0109] P f2 =∑P fi2

[0110] P f3 =∑P fi3

[0111] P f3 =∑P fi3

[0112] 2) If the total amount of active power needs to be adjusted to meet P x |≤|P f1 |, the whole network only regulates active power through the photovoltaic group, and the active power command of the photovoltaic group is ΔP i1 =P x ×P fi1 / P f1 , the active power command of each photovoltaic inverter in the group is ΔP i1j =ΔP i1 ×P fi1j / P fi1 , using the fast adjustment and no mechanical loss characteristics of power electronic devices in photovoltaic inverters to adjust the active power of the entire network;

[0113] 3) If the total amount of active power needs to be adjusted to meet |P f1 |<|P x |≤|P f1 +P f3 |, then each inverter in the PV group is adjusted to the active limit value P ei1j After that, the energy storage group distributes the insufficient active power according to the adjustable active power ratio of each inverter in the group. The active power command ΔP of the energy storage group i3 =(P x -P f1 )×P fi3 / P f3 , the active power command of each energy storage inverter in the group is ΔP i3k =ΔP i3 ×P fi3k / P fi3 ;

[0114] 4) If the total amount of active power needs to be adjusted to meet |P f1 +P f3 |<|P x |≤|P f1 +P f2 +P f3 |, then each inverter in the PV group is adjusted to the active limit value P ei1j And each inverter in the energy storage group is adjusted to the active limit value P ei3k After that, the part with insufficient active power to be adjusted will be distributed by the wind turbine group according to the adjustable active power ratio of each inverter in the group. The active power command of each zone wind turbine group is ΔP i2 =(P x -P f1 -P f3 )×P fi2 / P f2 , the active power command of each wind turbine inverter in the group is ΔP i2h =ΔP i2 ×P fi2h / P fi2 ;

[0115] 5) If the total amount of active power needs to be adjusted to meet |P f1 +P f2 +P f3 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5 |, then each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h The part of the total active power required to be adjusted that is insufficient is distributed by the conventional units according to the active power adjustable ratio of each unit in the group. The active power instruction of each conventional unit is ΔP i4 =(P x -P f1 -P f2 -P f3 )×P fi4 / P f4 , the active power command of each conventional unit is ΔP i4g =ΔP i4 ×P fi4g / P fi4;

[0116] 6) If the total amount of active power needs to be adjusted to meet |P f1 +P f2 +P f3 +P f4 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5 |, then each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g The part of the total active power required to be adjusted that is insufficient is distributed by the load group according to the active power adjustable ratio of each adjustable load in the group. The active power instruction of each load group is ΔP i5 =(P x -P f1 -P f2 -P f3 -P f4 )×P fi5 / P f5 , each adjustable load active power command is ΔP i5q =ΔP i5 ×P fi5q / P fi5 ;

[0117] 7) If the total amount of active power needs to be adjusted to meet |P f1 +P f2 +P f3 +P f4 +P f5 |<|P x |, then each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g , and the adjustable loads in the load group are all adjusted to the active power limit value P ei5q When the adjustable active power of photovoltaic, wind turbine, energy storage, conventional units and load is insufficient, the long-term active power control mode is activated.

[0118] Example 1.

[0119] The existing coordinated control in a high-proportion source-grid-load-storage project in the northwest involves wind, solar, and storage, and the allocation of energy storage is relatively high. Factors such as regulation costs are not comprehensively considered. Wind and solar are generally in maximum power operation mode or are allocated according to adjustable proportions, which makes the regulation resources of wind power, photovoltaics, and loads insufficient, and the energy storage capacity is configured relatively large. The method proposed in the present invention involves coordinated control of multiple types and quantities of regulation resources, and carries out unified optimization allocation based on the real-time regulation capability feedback of various resource objects and the frequency deviation of the power grid, especially considering the regulation cost. Therefore, wind power, photovoltaics, energy storage, conventional units, and loads are uniformly regulated according to a certain priority, and high-priority resources are adjusted to the limit as much as possible. The insufficient part is adjusted by secondary resources, and the priority can be adjusted according to the actual operating conditions. By fully tapping the regulation resources of wind power, photovoltaics, and loads, the energy storage configuration is reduced by 40%, which has good economic efficiency.

[0120] The method proposed in the present invention involves coordinated control of multiple types and quantities of regulation resources, and carries out unified optimization allocation based on the real-time regulation capability feedback of various resource objects and the grid frequency deviation, so as to avoid grid power oscillation caused by errors in the measurement links of multiple control objects and delays in the control links, and improve the level of safe and stable operation.

[0121] The method proposed in the present invention fully considers the rapid characteristics of power electronic equipment, the charging and discharging losses of energy storage, the operation losses of fans and conventional units, and the power supply stability of loads, reasonably sets priorities for various adjustment resources, and adjusts photovoltaics, energy storage, fans, conventional units and loads in turn, taking into account the rapid flexibility of adjustment, the economy of unit wear and the stability of load power supply.

[0122] The present invention also proposes an active coordination control device suitable for a source-grid-load-storage integrated power grid, including: a whole-grid partitioning and grouping module, a power grid frequency monitoring module, a source-grid-load-storage resource adjustable active power calculation module, and a source-grid-load-storage resource active power allocation module;

[0123] The whole network partitioning and grouping module is used to partition the whole network according to the geographical location of the source, grid, load and storage resources of the whole network, and divide the same partition into resource groups according to the type of source, grid, load and storage resources; the equipment with active control capability in each resource group is used as the element of each resource group;

[0124] The power grid frequency monitoring module is used to monitor the power grid frequency and frequency change rate in real time. When the power grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active power coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and is outside the safe operating frequency range of the power grid frequency, the steady-state active power control is started;

[0125] The source-grid-load-storage resource adjustable active power calculation module is used to determine the active power regulation limit of each element according to the real-time active power output of each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable amount of each element, and the sum of the active power adjustable amounts of each element in the resource group as the active power adjustable amount of each resource group;

[0126] The active power allocation module of source, grid, load and storage resources is used to determine the priority of each resource group participating in the regulation by adopting a comprehensive evaluation ideal solution, taking the fastest regulation response speed, the least regulation loss and the lowest regulation cost of each resource group as the positive ideal solution; and allocates the active power of source, grid, load and storage resources to each group in turn according to the priority.

[0127] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0128] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0129] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0130] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0131] 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, and any modifications or equivalent replacements that do 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. An active power coordination control method applicable to a source-grid-load-storage integrated power grid, characterized in that: include: Step 1: Partition and group the entire network, including: The whole network is divided into zones according to the geographical locations of the source, grid, load and storage resources of the whole network, and each zone is divided into resource groups according to the types of source, grid, load and storage resources; the devices with active power control capability in each resource group are used as elements of each resource group; Step 2, grid frequency monitoring, includes: Real-time monitoring of the grid frequency and frequency change rate. When the grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active power coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and is outside the safe operating frequency range of the grid frequency, the steady-state active power control is started; Step 3, calculating the adjustable active power of source, grid, load and storage resources, including: Determine the active power regulation limit of each element according to the real-time active power output of each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable amount of each element, and the sum of the active power adjustable amounts of each element in the resource group as the active power adjustable amount of each resource group; Step 4: Taking the resource group with the fastest regulation response speed, the least regulation loss and the smallest regulation cost as the positive ideal solution, a comprehensive evaluation ideal solution is used to determine the priority of each resource group participating in the regulation; the active power of source, grid, load and storage resources is allocated to each group in turn according to the priority.

2. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 1 is characterized in that: The same partition is divided into photovoltaic groups, wind turbine groups, energy storage groups, conventional groups and load groups according to resource types.

3. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 1 is characterized in that: According to national standards and the actual operation requirements of the source-grid-load-storage integrated power grid, the transient target control frequency dead zone f is set. d , the threshold value f of the frequency change rate m And the upper and lower limits of safe operating frequency f su 、f sl ; The safe operating frequency range of the power grid frequency is [f sl ,f su ].

4. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 2 is characterized in that: In step 3, the active power regulation limit includes the upper and lower limits of active power regulation, as follows: 1) Photovoltaic group: Active power regulation upper limit meets P ei1j =U m ×I m , the lower limit of active power regulation satisfies P ei1j =0; where the maximum operating point voltage U of the photovoltaic inverter is calculated based on the light intensity. m , Maximum operating point current I m ; 2) Fan unit: Active power regulation upper limit is met The lower limit of active power regulation satisfies P ei2h =0; where C p is the wind energy utilization coefficient, β is the blade pitch angle, λ is the blade tip speed ratio, v is the wind speed, R is the rotor radius, and ρ is the air density; 3) Energy storage group: Active power regulation upper limit meets P ei3k =P mi3k , the lower limit of active power regulation satisfies P ei3k =-P mi3k ; Among them, P mi3k is the maximum power of the energy storage inverter; when the energy storage charge state is higher than the set upper limit or lower than the set lower limit, it cannot be charged or discharged. At this time, the active power adjustment upper or lower limit P of the energy storage element ei3k =0; 4) Conventional units: Active power regulation upper limit meets P ei4g =P i4g ×(1+g1), the lower limit of active power regulation satisfies P ei4g =P i4g ×(1-g2); where the maximum upward frequency regulation capacity of conventional units is g1, and the maximum downward regulation capacity is g2; 5) Load group: Active power regulation upper limit meets P ei5q =P mi5q , the lower limit of active power regulation satisfies P ei5q =P li5q ; Among them, the maximum operating power of the adjustable load P mi5q , the minimum operating power is P li5q .

5. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 4 is characterized in that: The adjustable active power of each element satisfies the following relationship: P i1j =P ei1j -P fi1j P i2h =P ei2h -P fi2h P i3k =P ei3k -P fi3k P i4g =P ei4g -P fi4g P i5q =P ei5q -P fi5q In the formula, the active outputs of the jth inverter of the PV group in the i-th zone, the hth inverter of the wind turbine group, the kth inverter of the energy storage group, the gth unit of the conventional unit, and the qth load of the load group are P respectively. i1j , P i2h , P i3k , P i4g , P i5q , the active power regulation limits are P ei1j , P ei2h , P ei3k , P ei4g , P ei5q , the adjustable active power is P fi1j , P fi2h , P fi3k , P fi4g , P fi5q .

6. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 5 is characterized in that: The active adjustable quantities of the photovoltaic group, wind turbine group, energy storage group, conventional group, and load group in the i-th zone satisfy the following relationships: P fi1 ∑P fi1j (j=1~n i1 ) P fi2 =∑P fi2h (h=1~n i2 ) P fi3 =∑P fi3k (k=1~n i3 ) P fi4 =∑P fi4g (g=1~n i4 ) P fi5 =∑P fi5q (q=1~n i5 ) Where P fi1 , P fi2 , P fi3 , P fi4 , P fi5 They are the active adjustable quantities of the photovoltaic group, wind turbine group, energy storage group, conventional unit, and load group in the i-th zone. The photovoltaic group contains n i1 PV inverter elements, and the wind turbine group contains n i2 wind turbine inverter elements, the energy storage group contains n i3 Energy storage inverter elements, conventional units contain n i4 There are n generator group elements, and the load group contains n i5 load element.

7. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 6 is characterized in that: In step 4, according to the priority of each resource group participating in the regulation and the relationship between the total active power required to be adjusted in the whole network and the total adjustable active power of each group, the active power instructions of each group are determined in turn; according to the active power instructions of each group and the proportion of the active power adjustable amount of each group in each area in the total adjustable active power of the whole group, the active power instructions of each group in each area are determined; according to the active power instructions of each group in each area and the proportion of the active power adjustable amount of each element in each group in each area in the active power adjustable amount of each group in each area, the active power instructions of each element in each group in each area are determined to carry out active coordinated control of the integrated power grid of source, grid, load and storage.

8. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 7 is characterized in that: Step 4 includes: Step 4.1, calculate the total adjustable active power of the photovoltaic group, wind turbine group, energy storage group, conventional unit and load group in the whole network, and satisfy the following relationship: P f1 =∑P fi1 P f2 =∑P fi2 P f3 =∑P fi3 P f3 =∑P fi3 Where P f1 , P f2 , P f3 , P f4 , P f5 They are the total adjustable active power of the photovoltaic group, wind turbine group, energy storage group, conventional unit and load group in the whole network; The total amount of active power required to be adjusted in the whole network P x , satisfying the following relationship: P x =Δf×K f Where Δf is the frequency deviation, K f is the frequency modulation coefficient; Step 4.2: If the total amount of active power required meets |P x |≤|P f1 |, then the whole network only adjusts active power through the PV group, and the active power instruction of the PV group is the total active power required to be adjusted in the whole network; Step 4.3, if the total amount of active power to be adjusted satisfies |P f1 |<|P x |≤|P f1 +P f3 |, the whole network first adjusts the active power through the PV group, and then adjusts the active power through the energy storage group; the active power command of the PV group is the upper limit of the active power regulation, and the active power command of the energy storage group is the difference between the total active power required to be adjusted in the whole network and the upper limit of the active power regulation of the PV group; Step 4.4, if the total amount of active power to be adjusted satisfies |P f1 +P f3 |<|P x |≤|P f1 +P f2 +P f3 |, the whole network first adjusts the active power through the PV group, then adjusts the active power through the energy storage group, and finally adjusts the active power through the wind turbine group; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, and the active power command of the wind turbine group is the difference between the total active power required to be adjusted in the whole network and the upper limits of active power regulation of the PV group and the upper limits of active power regulation of the energy storage group; Step 4.5: If the total amount of active power required meets |P f1 +P f2 +P f3 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5 |, the whole network first adjusts the active power through the PV group, then through the energy storage group, then through the wind turbine group, and finally through the conventional unit; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, the active power command of the wind turbine group is the upper limit of active power regulation, and the active power command of the conventional unit is the difference between the total active power required to be adjusted in the whole network and the upper limit of active power regulation of the PV group, the upper limit of active power regulation of the energy storage group, and the upper limit of active power regulation of the wind turbine group; Step 4.6, if the total amount of active power to be adjusted satisfies |P f1 +P f2 +P f3 |<|P x |≤|P f1 +P f2 +P f3 +P f4 +P f5 |, the whole network first adjusts the active power through the PV group, then through the energy storage group, then through the wind turbine group, then through the conventional unit, and finally through the load group; the active power command of the PV group is the upper limit of active power regulation, the active power command of the energy storage group is the upper limit of active power regulation, the active power command of the wind turbine group is the upper limit of active power regulation, the active power command of the conventional unit is the upper limit of active power regulation, and the active power command of the load group is the difference between the total active power required to be adjusted in the whole network and the upper limits of active power regulation of the PV group, the upper limits of active power regulation of the energy storage group, the upper limits of active power regulation of the wind turbine group, and the upper limits of active power regulation of the conventional unit.

9. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8 is characterized in that: In step 4.2, the active power command of each PV inverter in the PV group is ΔP i1j =ΔP i1 ×P fi1j / P fi1 .

10. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8, characterized in that: In step 4.3, each inverter in the PV group is adjusted to the active limit value P ei1j After that, the energy storage group distributes the insufficient active power according to the adjustable active power ratio of each inverter in the group. The active power command ΔP of the energy storage group i3 =(P x -P f1 )×P fi3 / P f3 , the active power command of each energy storage inverter in the group is ΔP i3k =ΔP i3 ×P fi3k / P fi3 .

11. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8, characterized in that: In step 4.4, each inverter in the PV group is adjusted to the active limit value P ei1j And each inverter in the energy storage group is adjusted to the active limit value P ei3k After that, the part with insufficient active power to be adjusted will be distributed by the wind turbine group according to the adjustable active power ratio of each inverter in the group. The active power command of each zone wind turbine group is ΔP i2 =(P x -P f1 -P f3 )×P fi2 / P f2 , the active power command of each wind turbine inverter in the group is ΔP i2h =ΔP i2 ×P fi2h / P fi2 .

12. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8, characterized in that: In step 4.5, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h The part of the total active power required to be adjusted that is insufficient is distributed by the conventional units according to the active power adjustable ratio of each unit in the group. The active power instruction of each conventional unit is ΔP i4 =(P x -P f1 -P f2 -P f3 )×P fi4 / P f4 , the active power command of each conventional unit is ΔP i4g =ΔP i4 ×P fi4g / P fi4 .

13. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8, characterized in that: In step 4.6, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g The part of the total active power required to be adjusted that is insufficient is distributed by the load group according to the active power adjustable ratio of each adjustable load in the group. The active power instruction of each load group is ΔP i5 =(P x -P f1 -P f2 -P f3 -P f4 )×P fi5 / P f5 , each adjustable load active power command is ΔP i5q =ΔP i5 ×P fi5q / P fi5 .

14. The active power coordination control method applicable to the source-grid-load-storage integrated power grid according to claim 8, characterized in that: In step 4.7, each inverter in the PV group is adjusted to the active limit value P ei1j , and each inverter in the energy storage group is adjusted to the active limit value P ei3k , and each inverter in the wind turbine group is adjusted to the active limit value P ei2h , and all generators of conventional units are adjusted to the active power limit value P ei4g , and the adjustable loads in the load group are all adjusted to the active power limit value P ei5q ; When the adjustable active power of photovoltaic, wind turbine, energy storage, conventional units and loads is insufficient, the long-term active power control mode is activated.

15. An active power coordination control device suitable for a source-grid-load-storage integrated power grid, used to implement the method described in any one of claims 1 to 14, It is characterized in that It includes: whole network partition and grouping module, power grid frequency monitoring module, source grid load storage resource adjustable active power calculation module, source grid load storage resource active power allocation module; The whole network partitioning and grouping module is used to partition the whole network according to the geographical location of the source, grid, load and storage resources of the whole network, and divide the same partition into resource groups according to the type of source, grid, load and storage resources; the equipment with active control capability in each resource group is used as the element of each resource group; The power grid frequency monitoring module is used to monitor the power grid frequency and frequency change rate in real time. When the power grid frequency deviation exceeds the transient target control frequency dead zone and the frequency change rate is greater than the threshold value, the active power coordinated control of the source, grid, load and storage resources is started; when the frequency change rate is not greater than the threshold value and is outside the safe operating frequency range of the power grid frequency, the steady-state active power control is started; The source-grid-load-storage resource adjustable active power calculation module is used to determine the active power regulation limit of each element according to the real-time active power output of each element; collect the active power output of each element in each resource group in each area of ​​the whole network, and use the difference between the active power regulation limit and the active power output as the active power adjustable amount of each element, and the sum of the active power adjustable amounts of each element in the resource group as the active power adjustable amount of each resource group; The active power allocation module of source, grid, load and storage resources is used to determine the priority of each resource group participating in the regulation by adopting a comprehensive evaluation ideal solution, taking the fastest regulation response speed, the least regulation loss and the lowest regulation cost of each resource group as the positive ideal solution; and allocates the active power of source, grid, load and storage resources to each group in turn according to the priority.

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