Reactive power and voltage control method and related apparatus

Abstract

A reactive power and voltage control method and a related apparatus, applied to the field of power system control. The method comprises: monitoring a current operation parameter of a grid connection point of a novel power system, and when the absolute value of the difference between the current operation parameter and a target operation parameter is greater than a preset deviation value, determining a total reactive power regulation amount on the basis of the target operation parameter; on the basis of the difference between a current reactive power of each reactive resource and a reactive power reference value, determining a first regulatable amount of each reactive resource; on the basis of the difference between the total reactive power regulation amount and the sum of first regulatable amounts, a reactive power threshold of each reactive resource, and a preset regulation priority, calculating a reactive power regulation amount of each reactive resource; and on the basis of the reactive power regulation amount of each reactive resource and the current reactive power, outputting a target reactive power of each reactive resource. In this way, by allocating the total reactive power regulation amount with reference to the reactive power reference value, the uniformity of reactive power distribution within the power system is improved.

Description

Reactive voltage control method and related device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of power system control, in particular to a reactive voltage control method and related device. BACKGROUND

[0002] With the development of new energy power generation technology, new power systems such as photovoltaic power plants, wind power plants, energy storage power stations and source-grid-load-storage systems have become an important development path to fully exert the adjustment capacity of the power generation side, load side and energy storage side, and to solve the problems of clean energy consumption and power grid volatility.

[0003] To achieve the purposes of new energy grid-connected operation, normal operation of load equipment, and safe and stable operation of the system, it is crucial to stabilize the system voltage at the new power system grid connection point within the qualified range. At present, the Automatic Voltage Control (AVC) technology is usually used to control the voltage at the new power system grid connection point, and the reactive power of various reactive resources in the new power system is sequentially adjusted. After the reactive power of a type of reactive resource is exhausted, another type of reactive resource is released, so that the system voltage is within the qualified range. However, in the new power system, new energy power generation systems such as wind power generation systems and photovoltaic power generation systems, energy storage devices, and reactive regulation devices such as Static Var Generator (SVG) all have reactive regulation capabilities, and the types of reactive resources in the system are diverse. Releasing another type of reactive resource after the reactive power of a type of reactive resource is exhausted will lead to the problem of excessive regulation of a certain type of reactive resource, thereby reducing the operating efficiency of the system and causing uneven distribution of reactive power in the system.

[0004] Therefore, how to improve the uniformity of reactive power distribution in the system during reactive control of the new power system has become a problem to be solved. SUMMARY

[0005] In a first aspect, the embodiments of the present disclosure provide a reactive voltage control method, which comprises:

[0006] monitoring the current operating parameters of the new power system grid connection point;

[0007] if the absolute value of the difference between the current operating parameters and the target operating parameters is greater than a preset deviation value, determining the total amount of reactive regulation of the current system based on the target operating parameters;

[0008] determine, based on a difference between the current reactive power and a reactive power reference value of each reactive resource, a first adjustable amount of each reactive resource, the reactive resource including a new energy power generation system, an energy storage system, and a reactive power regulation device;

[0009] calculate, based on a difference between the total reactive power regulation amount and a first adjustable total amount, a reactive power regulation amount of each reactive resource, the first adjustable total amount being a sum of the first adjustable amount of each reactive resource, and a preset regulation priority, and a reactive power threshold of each reactive resource;

[0010] output a target reactive power of each reactive resource based on the reactive power regulation amount of each reactive resource and the current reactive power.

[0011] In a second aspect, the embodiments of the present disclosure provide a reactive voltage control device, the device comprising: a monitoring module, a first determination module, a second determination module, a calculation module, and an output module;

[0012] The monitoring module is configured to monitor a current operating parameter of a new power system grid connection point.

[0013] The first determination module is configured to determine, based on a target operating parameter, a total reactive power regulation amount of a current system in a case where an absolute value of a difference between the current operating parameter and the target operating parameter is greater than a preset deviation value.

[0014] The second determination module is configured to determine, based on a difference between a current reactive power and a reactive power reference value of each reactive resource, a first adjustable amount of each reactive resource in a case where a total reactive power regulation direction corresponding to the total reactive power regulation amount is opposite to a current reactive direction of each reactive resource, the reactive resource including a new energy power generation system, an energy storage system, and a reactive power regulation device.

[0015] The calculation module is configured to calculate, based on a difference between the total reactive power regulation amount and a first adjustable total amount, a reactive power regulation amount of each reactive resource, the first adjustable total amount being a sum of the first adjustable amount of each reactive resource, and a preset regulation priority, and a reactive power threshold of each reactive resource.

[0016] The output module is configured to output a target reactive power of each reactive resource based on the reactive power regulation amount of each reactive resource and the current reactive power.

[0017] In a third aspect, the embodiments of the present disclosure provide a reactive voltage control device, the device comprising: a memory and a processor;

[0018] The memory stores program code and transmits the program code to the processor.

[0019] The processor executes the steps of the reactive power voltage control method according to any one of the embodiments of the first aspect according to the program code.

[0020] In a fourth aspect, the embodiments of the present disclosure provide a computer program product, when the computer program product runs on at least one computing device, the at least one computing device implements the reactive power voltage control method according to any one of the embodiments of the first aspect.

[0021] In a fifth aspect, the embodiments of the present disclosure provide a new power system, the new power system comprises an automatic voltage control system and a plurality of reactive power resources; the reactive power resources comprise at least one of a new energy power generation system, an energy storage system and a reactive power regulating device.

[0022] The automatic voltage control system is electrically connected with the plurality of reactive power resources.

[0023] The automatic voltage control system is configured to adjust the reactive power of each reactive power resource based on the reactive power voltage control method according to any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] FIG. 1 is a flowchart of a reactive power voltage control method according to an embodiment of the present disclosure;

[0026] FIG. 2 is a flowchart of another reactive power voltage control method according to an embodiment of the present disclosure;

[0027] FIG. 3 is a flowchart of an active power output adjustment method according to an embodiment of the present disclosure;

[0028] FIG. 4 is a schematic diagram of a reactive power voltage control device according to an embodiment of the present disclosure;

[0029] FIG. 5 is a structural diagram of a reactive power voltage control device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] The reactive power voltage control method and related device provided by the present disclosure can be used in the field of power system control. The above is only an example and does not limit the application field of the reactive power voltage control method and related device provided by the present disclosure.

[0031] The terms "first", "second", "third", "fourth", and "fifth" and the like in the description and claims of the present disclosure and the appended drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the descriptive terms used herein are to be interpreted in the context as exercised by a person of ordinary skill in the art when described.

[0032] In the embodiments of the present disclosure, the words "as an example" or "for example" are used to represent an example, illustration, or description. Any embodiment or design scheme described as "as an example" or "for example" in the embodiments of the present disclosure should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "as an example" or "for example" are used to present the relevant concept in a specific manner.

[0033] The terms used in the embodiments of the present disclosure are only used to explain the specific embodiments of the present disclosure, and are not intended to limit the present disclosure.

[0034] In order for those skilled in the art to better understand the technical scheme of the present disclosure, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0035] Referring to FIG. 1, it is a flow chart of a reactive voltage control method provided by an embodiment of the present disclosure. The method is applied to a new power system, and includes the following steps:

[0036] S101: Monitor the current operating parameters of the grid connection point of the new power system.

[0037] The new power system includes but is not limited to source-grid-load-storage systems, photovoltaic power generation systems, wind power generation systems, and energy storage systems. Among them, the photovoltaic power generation system, the wind power generation system, and the energy storage system all need to be connected to the grid. In the new power system, new energy power generation systems, large power grids, power loads, and energy storage systems can be organically integrated together to form a comprehensive new power system, thereby realizing efficient use of energy and optimizing the balance between supply and demand of energy.

[0038] In this embodiment, the new power system includes an automatic voltage control (AVC) system and multiple types of reactive power resources. The automatic voltage control is an important technology for maintaining the voltage level of the power grid in the power system. The AVC system can automatically regulate the reactive power in the power grid to ensure that the voltage of the entire power grid is within the set safety range. The reactive power resources can include new energy power generation systems such as photovoltaic power generation systems and wind power generation systems, energy storage systems, and reactive power regulation devices such as static var generators (SVGs) and capacitors. The reactive voltage control method provided in this embodiment can be applied to the AVC system to monitor and control the current system voltage U PCC of the new power system in real time.

[0039] For example, the current operating parameters can be parameters required to be obtained during the voltage control process of the AVC system, such as any one or more of the current system voltage, the current reactive power, and the current power factor at the grid connection point.

[0040] S102: Determine whether the absolute value of the difference between the current operating parameter and the target operating parameter is greater than a preset deviation value. If yes, execute the steps of S103; if no, execute the steps of S101.

[0041] For example, the current operating parameter is the current system voltage of the new power system at the grid connection point, the target operating parameter is the target voltage of the new power system at the grid connection point, and the preset deviation value is ε1. The target voltage U 目标值 is a pre-set system grid connection point voltage target value or an instruction value of the system grid connection point voltage issued by the grid dispatching mechanism, and (U 目标值 ±ε1) is the qualified range of the grid connection point voltage. If the absolute value of the difference between the current system voltage U PCC and the target voltage U 目标值 is less than or equal to the preset deviation value, that is, |U 目标值 -U PCC |≤ε1, it can be considered that the current system voltage is within the qualified range, and no intervention is needed for the system voltage. The step of S101 can be continuously executed to continuously monitor the system voltage. If the absolute value of the difference between the current system voltage and the target voltage is greater than the preset deviation value, that is, |U 目标值 -U PCC |>ε1, it can be considered that the current system voltage is not within the qualified range, and intervention is needed for the current system voltage. The steps of S103-106 can be executed to adjust the reactive power of each reactive power resource to make the system voltage return to the qualified range of the grid connection point voltage.

[0042] S103: Determine the total reactive power regulation of the current system based on the target operating parameters.

[0043] Taking the current operating parameter as the current system voltage and the target operating parameter as the target system voltage as an example, the difference between the current system voltage and the target voltage (U) can be calculated. 目标值 -U PCC ) and voltage reactive power sensitivity coefficient S Q-U The product of these two factors yields the total reactive power regulation ΔQ of the voltage, i.e., ΔQ = (U... 目标值 -U PCC )×S Q-U The voltage-reactive power sensitivity coefficient (S) is defined as the increase or decrease in reactive power required for a 1 kV increase or decrease in system voltage in a new power system. Q-U This can be obtained through actual testing.

[0044] As an example, S Q-U =42000 (kVar / kV), current system voltage U PCC =110kV, target voltage U 目标值 =111kV, then based on the formula ΔQ=(U 目标值 -U PCC )×S Q-U Therefore, ΔQ = 42MVar.

[0045] The reactive power of each reactive resource in the system is adjusted. During the adjustment process, the total reactive power change of all reactive resources is ΔQ. Therefore, after reactive power adjustment, the change in system voltage is (U... 目标值 -U PCC After the system voltage changes, it can return to the acceptable range of the grid connection point voltage.

[0046] S104: If the total reactive power adjustment direction corresponding to the total reactive power adjustment is opposite to the current reactive power direction of each reactive power resource, then the first adjustable quantity of each reactive power resource is determined based on the difference between the current reactive power of each reactive power resource and the reactive power reference value.

[0047] Reactive resources can include new energy power generation systems, energy storage systems, and various reactive power regulation equipment.

[0048] When the total reactive power regulation direction corresponding to the total reactive power regulation is opposite to the current reactive power direction of each reactive power resource, the reactive power reference value Q of each reactive power resource can be calculated separately. base With current reactive power Q i_实时 The difference is used to obtain the first adjustable quantity (Q) of each reactive power resource. base -Qi_实时 ). Wherein, the positive and negative of the first adjustable amount represents the reactive power adjustment direction.

[0049] S105: Based on the difference between the total amount of reactive power adjustment and the first adjustable total amount, the reactive power threshold of each reactive resource and the preset adjustment priority, the reactive power adjustment amount of each reactive resource is calculated.

[0050] Wherein, the first adjustable total amount Q temp is the sum of the first adjustable amount of each reactive resource, that is, Q temp =∑(Q base -Q i_实 时 ).

[0051] In the case where the difference between the total amount of reactive power adjustment ΔQ and the first adjustable total amount Q temp is greater than 0, the remaining adjustment amount to be allocated after each reactive resource is adjusted to the reactive reference value Q base can be calculated: Q 剩余 =ΔQ-Q temp Then, according to the reactive power threshold of each reactive resource and the preset adjustment priority, Q 剩余 is allocated to each reactive resource. In the case where the difference between ΔQ and Q temp is less than or equal to 0, ΔQ can be directly allocated to each reactive resource according to the reactive power threshold of each reactive resource and the preset adjustment priority.

[0052] Wherein, the positive and negative of ΔQ and Q temp only represents the reactive power adjustment direction, not the size. Wherein, when ΔQ and Q temp are positive, it means that the reactive power is adjusted upward (i.e. upward); on the contrary, when ΔQ and Q temp are negative, it means that the reactive power is adjusted downward (i.e. downward). Therefore, in the process of calculating ΔQ-Q temp , the absolute values of ΔQ and Q temp participate in the calculation to determine whether the difference is greater than, less than or equal to 0. The direction of Q 剩余 is the same as that of the larger absolute value of ΔQ and Q temp .

[0053] The preset adjustment priority includes upward adjustment priority and downward adjustment priority. Optionally, the upward adjustment priority and the downward adjustment priority of each reactive resource in the new power system can be the same or different.

[0054] As an example, a new power system may include a new energy power generation system, an energy storage system, and a reactive power regulation device. The new energy power generation system includes a wind power generation system and / or a photovoltaic power generation system, and the reactive power regulation device is an SVG (Static Var Generator). Based on equipment performance or user preferences, priority levels for reactive power adjustment can be set for the wind power generation system, photovoltaic power generation system, energy storage system, and SVG, respectively, allowing for both upward and downward adjustments.

[0055] Optionally, reactive power resources such as new energy power generation systems, energy storage systems, and reactive power regulation equipment can all be set to the same priority. Based on the reactive power threshold of each resource, the adjustable reactive power quantity of each resource can be calculated. Then, based on the ratio of the adjustable reactive power quantities of each resource, the total reactive power regulation ΔQ is compared with the first adjustable total quantity Q. temp If the difference is greater than 0, Q will be proportionally... 剩余 Distributed to various reactive resources; in ΔQ and Q temp If the difference is less than or equal to 0, ΔQ is allocated to each reactive resource proportionally.

[0056] Optionally, since SVG is a professional reactive power regulation device with a fast response speed, it can be given a higher priority, for example, setting the priority of SVG to 1; while to increase the economic efficiency of the new power system, wind power generation system, photovoltaic power generation system and energy storage system should generate more active power during normal operation, so wind power generation system, photovoltaic power generation system and energy storage system can be given a lower priority, for example, to avoid the over-regulation of a certain type of reactive power resource in wind power generation system, photovoltaic power generation system and energy storage system, wind power generation system, photovoltaic power generation system and energy storage system can be set to the same priority 2.

[0057] Therefore, adjustment priorities are set for different types of reactive resources. For multiple types of reactive resources with the same adjustment priority, the sum of reactive adjustment amounts of each reactive resource in the adjustment priority is allocated proportionally based on the ratio of the reactive adjustment amount of each type of reactive resource. This eliminates the need to wait until the reactive power of one type of reactive resource is exhausted before consuming another type of reactive resource, thus enhancing the uniformity of reactive power distribution within the system.

[0058] For example, reactive power reference value Q base =0MVar. If the total reactive power regulation ΔQ = 42MVar, the first adjustable total Q of each reactive power resource is... temp =32MVar, then Q 剩余 =ΔQ-Q temp =10MVar.

[0059] In one instance, raising the reactive power threshold for the highest priority reactive resource includes the reactive power cap Q. i_max =20MVar and reactive power lower limit Qi_min = -5MVar, the current reactive power of this reactive resource is less than Q. base Q i_实时 <Q base Then the reactive power of the reactive resource is increased to Q. base After that, there is still a second adjustable value of 20MVar. At this time, Q is... 剩余 All of it is allocated to this reactive power resource.

[0060] In another example, there are two priorities for reactive resources. The number of reactive resources with higher priority that are increased is 1, and the reactive power is increased to Q. base Afterwards, there is a second adjustable quantity of 4MVar; the number of reactive resources with lower priority is increased by 2, and the reactive power is increased to Q. base Afterwards, there are second adjustable quantities of 8MVar and 4MVar respectively. In this case, the remaining 4MVar of Q is allocated to higher priority reactive resources, and Q is... 剩余 The 6MVar in Q is allocated to two lower-priority reactive resources according to the proportion of power adjustability. 剩余 The 4MVar in Q is allocated to the second adjustable reactive resource of 8MVar, and Q is... 剩余 The 2MVar in the middle is allocated to the second adjustable reactive resource of 4MVar.

[0061] For example, the reactive power reference value Q base =0MVar. If the total reactive power regulation ΔQ = 42MVar, the first adjustable total Q of each reactive power resource is... temp =50MVar, then ΔQ is directly allocated to each reactive resource according to the reactive power threshold of each reactive resource and the preset adjustment priority.

[0062] In one example, there are two priority reactive resources. One reactive resource has a higher priority and its first adjustable value is 21 MVar. Three reactive resources have lower priority and their first adjustable values ​​are 6 MVar, 12 MVar, and 24 MVar, respectively. In this case, 21 MVar from ΔQ is allocated to the higher priority reactive resource, and the remaining 21 MVar from ΔQ is allocated to the three lower priority reactive resources according to their power adjustability. 12 MVar from ΔQ is allocated to the reactive resource with a first adjustable value of 24 MVar, 6 MVar from ΔQ is allocated to the reactive resource with a first adjustable value of 12 MVar, and 3 MVar from ΔQ is allocated to the reactive resource with a first adjustable value of 6 MVar.

[0063] The reactive power adjustment amount of the reactive power resource is the sum of the first adjustment amount and the second adjustment amount of the reactive power resource. For example, the reactive power adjustment of a certain reactive power resource is 5 MVar to reach the reactive power reference value Q base After the reactive power distribution, Q 剩余 10 MVar is distributed to the reactive power resource, that is, the first adjustment amount is 5 MVar and the second adjustment amount is 10 MVar, and the reactive power adjustment amount of the reactive power resource is 5 MVar + 10 MVar = 15 MVar.

[0064] S106: Based on the reactive power adjustment amount of each reactive power resource and the current reactive power, output the target reactive power of each reactive power resource.

[0065] The target reactive power is the sum of the reactive power adjustment amount and the current reactive power, wherein the direction of the reactive power adjustment amount and the current reactive power is positive or negative in the mathematical operation. For example, the current reactive power of a certain reactive power resource is -5 MVar and the reactive power adjustment amount is 15 MVar, and the target reactive power of the reactive power resource is 10 MVar.

[0066] Therefore, in the embodiment of the present disclosure, when the total reactive power adjustment amount corresponds to the total reactive power adjustment direction opposite to the current reactive power direction of each reactive power resource, the reference reactive power reference value Q base , the total reactive power adjustment amount is distributed, which can avoid the reactive power resources with opposite reactive power directions due to reactive power distribution, reduce the mutual internal consumption between the reactive power resources, that is, avoid the generation of reactive power circulation in the system, and improve the uniformity of the internal reactive power distribution of the new power system after the reactive power distribution.

[0067] Referring to FIG. 2, which is a flow chart of another reactive power voltage control method provided by the embodiment of the present disclosure, the method comprises:

[0068] S201: Monitor the current reactive power of each reactive power resource in the new power system and the current operating parameter of the grid connection point.

[0069] As an example, the current operating parameter can be the parameter required to be obtained during the voltage control process of the AVC system, for example, including any one or more of the current system voltage, the current reactive power and the current power factor.

[0070] S202: Determine whether there is a first reactive power resource and a second reactive power resource with opposite reactive power directions in the new power system, if yes, execute the step of S203; if no, execute the step of S204.

[0071] If the new power system includes a first reactive power resource and a second reactive power resource with opposite reactive power directions, it indicates that in the new power system, there are reactive power resources with inconsistent reactive power directions, i.e., a part of the reactive power resources have positive reactive power and are in the state of generating reactive power; another part of the reactive power resources have negative reactive power and are in the state of absorbing reactive power. In this case, reactive power circulation occurs in the system, and reactive power resources consume each other. The reactive power in the system can be balanced by the steps of S203 to improve the operation efficiency of the system.

[0072] S203: The reactive power of the first reactive power resource is adjusted to the reactive power reference value, and the total reactive power adjustment amount of the first reactive power resource is distributed to one or more of the second reactive power resources according to the preset adjustment priority of each reactive power resource.

[0073] Wherein, the absolute value of the current total reactive power of the first reactive power resource is less than the absolute value of the current total reactive power of the second reactive power resource.

[0074] As an example, the absolute value of the total reactive power of all the reactive power resources with reactive power less than the reactive power reference value Q base is recorded as |∑Q a |(Q a <0); and the absolute value of the total reactive power of all the reactive power resources with reactive power greater than the reactive power reference value Q base is recorded as |∑Q b |(Q b >0). If |∑Q a |(Q a <0) > |∑Q b |(Q b >0), the first reactive power resource is the reactive power resource with reactive power greater than the reactive power reference value Q base , and the second reactive power resource is the reactive power resource with reactive power less than the reactive power reference value Q base . At this time, the reactive power of each first reactive power resource is adjusted to the reactive power reference value Q base , and the total reactive power adjustment amount is ∑Q b . According to the preset adjustment priority of each reactive power resource, ∑Q b is distributed to one or more of the second reactive power resources. In this way, the total reactive power in the new power system remains unchanged, but the reactive power directions of the reactive power resources are adjusted to be in the same direction, thereby solving the problems of reactive power circulation in the system and reactive power resources consuming each other, and improving the operation efficiency of the system.

[0075] For example, |∑Q a |(Q a <0) = 40 MVar, and |∑Q b |(Q b> 0) = 30 MVar, Q base = 0; at this time, |∑Q a | (Q a < 0) > |∑Q b | (Q b > 0), the reactive power of all reactive resources whose current reactive power is greater than the reactive reference value Q base may be adjusted to 0, and the total reactive power adjustment amount of the first reactive resource is 30 MVar; if the reactive resource whose current reactive power is less than the reactive reference value Q base includes SVG with a higher adjustment priority and a wind power system with a lower adjustment priority, wherein the reactive power of the SVG is -25 MVar and the reactive power of the wind power system is -15 MVar, the total reactive power adjustment amount 30 MVar can be first allocated to the SVG based on the high adjustment priority of the SVG and the wind power system, 25 MVar of the reactive power up-regulation amount is allocated to the SVG, and the remaining 5 MVar of the reactive power adjustment amount is allocated to the wind power system. Thus, after adjustment, the reactive power of all reactive resources whose current reactive power is greater than the reactive reference value Q base is adjusted to 0, the reactive power of the SVG is adjusted to 0, the reactive power of the wind power system is adjusted to -10 MVar, and the direction of the reactive power of all reactive resources in the new power system is the same.

[0076] Similar to the case of |∑Q a | (Q a < 0) > |∑Q b | (Q b > 0), if |∑Q a | (Q a < 0) < |∑Q b | (Q b > 0), the first reactive resource is a reactive resource whose reactive power is less than the reactive reference value Q base , and the second reactive resource is a reactive resource whose reactive power is greater than the reactive reference value Q base , at this time, the reactive power of each first reactive resource is adjusted to the reactive reference value Q base , and the total reactive power adjustment amount is ∑Q a ; ∑Q a is allocated to one or more of the second reactive resources according to the preset adjustment priority of each reactive resource.

[0077] Alternatively, if |∑Q a | (Q a < 0) = |∑Q b | (Q b > 0), the reactive power of the first reactive resource and the second reactive resource can be adjusted to 0.

[0078] In this embodiment, the reactive reference value Q base Tends to 0, so as to adjust the reactive power of the first reactive resource and the second reactive resource in the opposite direction, so that the reactive direction of the two is the same, so as to solve the problem of reactive circulation in the system and improve the operation efficiency of the system.

[0079] It can be understood that in actual application, when the reactive instruction is 0, the reactive resource is difficult to fix the reactive power to 0, but will be zero drift (i.e. zero drift) around the value of 0, so Q base A positive or negative value that avoids zero drift and tends to 0 can be taken, for example, Q base 0.1MVar or 0.2MVar or -0.3MVar or -0.1MVar, etc. In this way, even if the device is in a zero drift state, it will not cause reactive circulation in the system, thereby improving the operation efficiency and stability of the system.

[0080] Alternatively, after the step of S203 is performed, the steps of S201-S203 can be re-executed to improve the accuracy of reactive control.

[0081] S204: Determine whether the absolute value of the difference between the current operating parameter and the target operating parameter is greater than the preset deviation value, if yes, execute the step of S205; if not, execute the step of S201.

[0082] In one embodiment, the current operating parameter is the current system voltage U PCC at the grid connection point of the new power system, the target operating parameter is the target voltage U 目标值 at the grid connection point of the system, and the preset deviation value is ε1. 目标值 -U PCC |>ε1, it can be considered that the current system voltage is not within the qualified range, and the steps of S205-S214 need to be executed to adjust the reactive power of each reactive resource and intervene in the current system voltage, so that the system voltage returns to the qualified range of the grid connection point voltage.

[0083] In another embodiment, the current operating parameter is the current reactive power Q PCC at the grid connection point of the new power system, the target operating parameter is the target reactive power Q 目标值 at the grid connection point of the system preset or issued by the grid dispatching mechanism, and the preset deviation value is ε2. 目标值 -Q PCC |>ε2, it can be considered that the current system reactive power is not within the qualified range, and the steps of S205-S214 need to be executed to adjust the reactive power of each reactive resource and intervene in the current reactive power, so that the reactive power of the system returns to its qualified range.

[0084] In another embodiment, the current operating parameter is the current power factor PF at the grid-connection point of the new power system PCC , the target operating parameter is the target power factor PF of the system grid-connection point preset or issued by the grid dispatching mechanism 目标值 , and the preset deviation value is ε3, then in the case of |PF 目标值 -PF PCC |> ε3, it can be considered that the current power factor is not within the qualified range, and the steps of S205-S214 need to be executed to adjust the reactive power of each reactive resource, to intervene in the current power factor and make the power factor of the system return to its qualified range.

[0085] S205: Determine the total amount of reactive power adjustment of the current system based on the target operating parameter.

[0086] As an example, if the current operating parameter is the current system voltage or the current reactive power, then based on the difference between the target operating parameter and the current operating parameter, the total amount of reactive power adjustment of the current system is determined; if the current operating parameter is the current power factor, then based on the target operating parameter and the active power at the grid-connection point of the new power system, the total amount of reactive power adjustment of the current system is determined.

[0087] For example, the current operating parameter is the current system voltage U PCC , the target operating parameter is the target voltage U 目标值 , and the voltage-reactive power sensitivity coefficient S Q-U , then the total amount of reactive power adjustment of the current system ΔQ = (U 目标值 -U PCC ) x S Q-U .

[0088] For example, the current operating parameter is the current reactive power Q PCC , the target operating parameter is the target reactive power Q 目标值 , then the total amount of reactive power adjustment of the current system ΔQ = (Q 目标值 -Q PCC .

[0089] For example, the current operating parameter is the current power factor PFPCC, the target operating parameter is the target power factor PF 目标值 , and the active power at the grid-connection point of the new power system is P PCC , which can be obtained by monitoring the AVC system, then the total amount of reactive power adjustment of the current system Wherein, when P PCC and PF 目标值 have the same positive and negative, "+" in the above formula is taken as "+", and when P PCC and PF 目标值 have opposite positive and negative, "+" in the above formula is taken as "-".

[0090] S206: Determine whether the total reactive power adjustment direction corresponding to the total reactive power adjustment is opposite to the current reactive power direction of each reactive power resource. If yes, execute step S207; if no, execute step S212.

[0091] Since steps S201-S203 have been executed, the current reactive power directions of each reactive power resource are the same before executing step S206. At this time, the total reactive power adjustment direction corresponding to the total reactive power adjustment and the current reactive power direction of each reactive power resource only exist in two cases: opposite or the same.

[0092] S207: Determine whether the difference between the total reactive power adjustment and the first adjustable total is greater than 0. If yes, execute step S208; if no, execute step S211.

[0093] The first adjustable total can be calculated by the formula Q temp =∑(Q base -Q i_实时 ) where Q temp is the first adjustable total, Q base is the reactive power reference value, and Q i_实时 is the current reactive power of the reactive power resource i.

[0094] If the total reactive power adjustment ΔQ is greater than the first adjustable total Q temp , that is, the difference between ΔQ and Q temp is greater than 0, the reactive power of each reactive power resource can be first adjusted to Q base by steps S208-S210, and then the remaining adjustment amount Q 剩余 to be allocated after adjustment is allocated to each reactive power resource to obtain the reactive power adjustment amount of each reactive power resource. If the first adjustable total Q temp is greater than or equal to the total reactive power adjustment ΔQ, that is, the difference between ΔQ and Q temp is less than or equal to 0, step S211 can be executed to directly allocate ΔQ to each reactive power resource according to the first adjustable amount of each reactive power resource and the preset adjustment priority to obtain the reactive power adjustment amount of each reactive power resource.

[0095] Thus, taking the reactive power reference value Q base as a dividing point, the total reactive power adjustment is allocated in two steps, which can make the reactive power of each reactive power resource more balanced after reactive power allocation.

[0096] S208: Determine the second adjustable amount of each reactive power resource in the total reactive power adjustment direction based on the reactive power threshold of each reactive power resource.

[0097] In the case of (ΔQ-Q temp ) > 0, even if the reactive power of each reactive power resource is adjusted to Q base, there is still a need to allocate Q 剩余 At this time, the second adjustable amount of each reactive resource in the total direction of reactive power regulation needs to be calculated in order to perform the step of S209, and Q 剩余 is allocated to each reactive resource by comprehensively considering the adjustment priority of each reactive resource and the proportion of the second adjustable amount of each reactive resource in the sum of the second adjustable amounts of all reactive resources.

[0098] The reactive power threshold of the reactive resource includes the upper limit of reactive power Q i_max and the lower limit of reactive power Q i_min In the case of a positive total direction of reactive power regulation, the second adjustable amount is Q i_upmax = Q i_max -Q base ; in the case of a negative total direction of reactive power regulation, the second adjustable amount is Q i_downmax = Q base -Q i_min .

[0099] S209: Based on the second adjustable amount of each reactive resource and the preset adjustment priority, the difference between the total amount of reactive power regulation and the first adjustable total amount is allocated to obtain the second adjustment amount of each reactive resource.

[0100] Wherein, if the sum of the second adjustable amounts of multiple same-level reactive resources with the same adjustment priority is greater than the sum of the second adjustment amounts of the multiple same-level reactive resources, the second adjustment amount of each same-level reactive resource is determined based on the proportion of the second adjustable amount of each same-level reactive resource in the sum of the second adjustable amounts of all same-level reactive resources.

[0101] As an example, assume that the total amount of reactive power regulation ΔQ = 42 MVar, the reactive reference value Q base is 0, and the reactive resources in the new power system include SVG, a wind power system, a photovoltaic power system, and an energy storage system. Among them, the up-regulation priority of the SVG is 1, and the up-regulation priorities of the wind power system, the photovoltaic power system, and the energy storage system are all 2; the Q i_max of the SVG is 5 MVar, and the Q i_实时 is -2 MVar; the Q i_max of the wind power system is 30 MVar, and the Q i_实时 is -5 MVar; the Q i_max of the photovoltaic power system is 40 MVar, and the Q i_实时 is -20 MVar; the Q i_max of the energy storage system is 20 MVar, and the Q i_实时 is -5 MVar.

[0102] Therefore, the first adjustable total amount Q temp of each reactive resource is ∑(Q base -Q i_实时) = 2 + 5 + 20 + 5 = 32 MVar, (AQ - Q temp ) > 0, Q 剩余 = 42 - 32 = 10 MVar, according to the formula Q i_upmax = Q i_max - Q base The second adjustable amount of each reactive power resource can be calculated, that is, the second adjustable amount of the SVG is 5 MVar, the second adjustable amount of the wind power generation system is 30 MVar, the second adjustable amount of the photovoltaic power generation system is 40 MVar, and the second adjustable amount of the energy storage system is 20 MVar.

[0103] Since the up-regulation priority of the SVG is 1, Q 剩余 is allocated to the SVG first until the second adjustable amount of the SVG is completely consumed, that is, 5 MVar in Q 剩余 is allocated to the SVG, and the second regulation amount of the SVG is 5 MVar; then, according to the proportion of the second adjustable amount of each reactive power resource with the up-regulation priority of 2 in the sum of the second adjustable amounts of the reactive power resources at the same level, the remaining 5 MVar in Q 剩余 , that is, the sum of the reactive power regulation amounts of the reactive power resources at the same level, is allocated to the wind power generation system, the photovoltaic power generation system and the energy storage system, to obtain the second regulation amount of each reactive power resource. The sum of the second adjustable amounts of the reactive power resources at the same level is 30 + 40 + 20 = 90 MVar, the second regulation amount of the wind power generation system is 5 x 30 / 90 = 1.67 MVar, the second regulation amount of the photovoltaic power generation system is 5 x 40 / 90 = 2.22 MVar, and the second regulation amount of the energy storage system is 5 x 20 / 90 = 1.11 MVar.

[0104] S210: Calculate the sum of the first adjustable amount and the second regulation amount of each reactive power resource to obtain the reactive power regulation amount of each reactive power resource.

[0105] Referring to the above example, the first adjustable amount of the SVG is Q base - Q i_实时 = 2 MVar, the second regulation amount is 5 MVar, and the reactive power regulation amount is 2 + 5 = 7 MVar; similarly, the reactive power regulation amount of the wind power generation system is 5 + 1.67 = 6.67 MVar, the reactive power regulation amount of the photovoltaic power generation system is 20 + 2.22 = 22.22 MVar, and the reactive power regulation amount of the energy storage system is 5 + 1.11 = 6.11 MVar.

[0106] S211: Based on the first adjustable amount of each reactive power resource and the preset regulation priority, allocate the total reactive power regulation amount to obtain the reactive power regulation amount of each reactive power resource.

[0107] If the sum of the first adjustable amounts of the multiple same-level reactive power resources with the same adjustment priority is greater than the sum of the reactive power adjustment amounts of the multiple same-level reactive power resources, the reactive power adjustment amount of each same-level reactive power resource is determined based on the proportion of the first adjustable amount of each same-level reactive power resource in the sum of the first adjustable amounts of the same-level reactive power resources.

[0108] In the case of (ΔQ-Q temp )≤0, the reactive power of each reactive power resource is adjusted to Q base If the required reactive power adjustment amount when Q

[0109] As an example, assume that the total reactive power adjustment amount ΔQ=22MVar, the reactive power reference value Q base is 0, and the reactive power resources in the new power system include an SVG, a wind power generation system, a photovoltaic power generation system, and an energy storage system. The SVG has an up-regulation priority of 1, and the wind power generation system, the photovoltaic power generation system, and the energy storage system each have an up-regulation priority of 2. The Q i_ 实时 of the SVG is -2MVar; the Q i_实时 of the wind power generation system is -5MVar; the Q i_实时 of the photovoltaic power generation system is -20MVar; and the Q i_实时 of the energy storage system is -5MVar.

[0110] Thus, the first adjustable total amount Q temp of each reactive power resource is ∑(Q base -Q i_实时 )=2+5+20+5=32MVar, and (ΔQ-Q temp )<0. The first adjustable amount of the SVG is 2MVar, the first adjustable amount of the wind power generation system is 5MVar, the first adjustable amount of the photovoltaic power generation system is 20MVar, and the first adjustable amount of the energy storage system is 5MVar.

[0111] Since the SVG's adjustment priority is 1, ΔQ is first allocated to the SVG until its first adjustable amount is completely consumed. That is, 2MVar of ΔQ is allocated to the SVG, and the SVG's reactive power regulation is 2MVar. Then, according to the proportion of the first adjustable amount of each reactive resource with an adjustment priority of 2 in the sum of the first adjustable amounts of all reactive resources of the same level, the remaining 20MVar in ΔQ, which is the sum of the reactive power regulation of the reactive resources of the same level, is allocated to the wind power generation system, photovoltaic power generation system, and energy storage system to obtain the reactive power regulation of each reactive resource. Among them, the sum of the first adjustable amounts of all reactive resources of the same level is 5 + 20 + 5 = 30MVar. The reactive power regulation of the wind power generation system is 20 × 5 / 30 = 3.33MVar, the reactive power regulation of the photovoltaic power generation system is 20 × 20 / 30 = 13.33MVar, and the reactive power regulation of the energy storage system is 20 × 5 / 30 = 3.33MVar.

[0112] S212: Based on the reactive power threshold of each reactive resource, determine the second adjustable quantity of each reactive resource in the overall reactive power regulation direction.

[0113] When the total reactive power regulation direction corresponding to the total reactive power regulation ΔQ is the same as the current reactive power direction of each reactive power resource, the second adjustable quantity of the reactive power resource in the total reactive power regulation direction can be obtained by calculating the difference between the reactive power threshold of the reactive power resource in the total reactive power regulation direction and the current reactive power.

[0114] For example, the current reactive power Q of a certain reactive resource i_实时 = -4MVar, the lower limit of reactive power of this reactive power resource is -20MVar, and the direction of ΔQ is related to Q. i_实时 If the directions are the same, then the second adjustable quantity of the reactive power resource is -16MVar.

[0115] S213: Based on the second adjustable quantity and preset adjustment priority of each reactive power resource, allocate the total reactive power adjustment amount to obtain the reactive power adjustment amount of each reactive power resource.

[0116] If the sum of the second adjustable quantities of multiple reactive resources with the same adjustment priority is greater than the sum of the reactive power adjustment quantities of multiple reactive resources with the same priority, then the reactive power adjustment quantity of each reactive resource with the same priority is determined based on the proportion of the second adjustable quantity of each reactive resource with the same priority in the sum of the second adjustable quantities of each reactive resource with the same priority.

[0117] As an example, assume the total reactive power regulation ΔQ = 33MVar. Reactive power resources in the new power system include SVG, wind power systems, photovoltaic power systems, and energy storage systems. The priority of SVG adjustment is 1, while the priority of wind power systems, photovoltaic power systems, and energy storage systems is 2. The Q of SVG... i_max For 5MVar, Qi_实时 Q of the wind power generation system is 2MVar i_max Q is 30MVar i_实时 Q of the photovoltaic power generation system is 5MVar i_max Q is 40MVar i_实时 Q of the energy storage system is 20MVar i_max Q is 20MVar i_实时 Q is 5MVar.

[0118] Thus, the direction of ΔQ is the same as the current reactive power direction of each reactive resource, and the formula Q i_upmax = Q i_max -Q i_实时 The second adjustable amount of each reactive resource can be calculated, that is, the second adjustable amount of the SVG is 3MVar, the second adjustable amount of the wind power generation system is 25MVar, the second adjustable amount of the photovoltaic power generation system is 20MVar, and the second adjustable amount of the energy storage system is 15MVar.

[0119] Since the priority of the SVG is 1, ΔQ is first allocated to the SVG until the second adjustable amount of the SVG is completely consumed, that is, 3MVar of ΔQ is allocated to the SVG, and the reactive power regulation amount of the SVG is 3MVar; then, according to the proportion of the second adjustable amount of each reactive resource with the priority of 2 in the sum of the second adjustable amounts of the same level reactive resources, the remaining 30MVar of ΔQ, that is, the sum of the reactive power regulation amounts of the same level reactive resources, is allocated to the wind power generation system, the photovoltaic power generation system and the energy storage system, to obtain the reactive power regulation amount of each reactive resource with the priority of 2. The sum of the second adjustable amounts of the same level reactive resources is 25+20+15=60MVar. Thus, the reactive power regulation amount of the wind power generation system is 30x25 / 60=12.5MVar, the reactive power regulation amount of the photovoltaic power generation system is 30x20 / 60=10MVar, and the reactive power regulation amount of the energy storage system is 30x15 / 60=7.5MVar.

[0120] S214: Based on the reactive power regulation amount and the current reactive power of each reactive resource, output the target reactive power of each reactive resource.

[0121] The target reactive power is the sum of the reactive power regulation amount and the current reactive power, wherein the direction of the reactive power regulation amount and the current reactive power is positive or negative in the mathematical operation.

[0122] Optionally, in each of the above embodiments, the reactive power regulation of each reactive resource can be realized by sending a reactive instruction to each reactive resource. The reactive instruction is the target reactive power, for example, the current reactive power of the SVG is 4MVar, and the reactive allocation amount is 2MVar, so the reactive instruction sent to the SVG is 6MVar.

[0123] Optionally, within the same reactive power resource, the principle of equal proportion allocation can be adopted to allocate the reactive power adjustment amount of the reactive power resource equally to each reactive power device contained in the reactive power resource. Since the control characteristics of each reactive power device within the same reactive power resource are consistent, equal proportion allocation of the reactive power target value to each reactive power device can keep the reactive power margin of each reactive power device consistent, thereby improving the working efficiency of the reactive power resource.

[0124] Taking a photovoltaic power generation system as an example, the photovoltaic power generation system has four reactive power devices, i.e., four photovoltaic inverters, among which the upper limit of reactive power of photovoltaic inverter 1 is 6 MVar, and the current reactive power is 1.2 MVar; the upper limit of reactive power of photovoltaic inverter 2 is 6 MVar, and the current reactive power is 2.4 MVar; the upper limit of reactive power of photovoltaic inverter 3 is 4 MVar, and the current reactive power is 1.6 MVar; the upper limit of reactive power of photovoltaic inverter 4 is 4 MVar, and the current reactive power is 0.8 MVar; the current reactive power of the photovoltaic power generation system is 6 MVar, and the reactive power allocation amount is 4 MVar. Thus, the reactive power target value of the photovoltaic power generation system is 10 MVar, which can be allocated to each photovoltaic inverter in equal proportion based on the ratio of the upper limit of reactive power of each photovoltaic inverter. 3 MVar of reactive power can be allocated to photovoltaic inverter 1 and photovoltaic inverter 2 respectively, and 2 MVar of reactive power can be allocated to photovoltaic inverter 3 and photovoltaic inverter 4 respectively. The reactive power control of the photovoltaic power generation system can be realized by sending a reactive power instruction of 3 MVar to photovoltaic inverter 1 and photovoltaic inverter 2 respectively, and sending a reactive power instruction of 2 MVar to photovoltaic inverter 3 and photovoltaic inverter 4 respectively. Based on the same method, sending a reactive power instruction to each reactive power device in the reactive power resource with a reactive power adjustment amount of 0 in the new power system can realize the reactive power control of the new power system.

[0125] As an example, after the step of performing S214, the steps of S201-S214 can be re-executed to perform real-time reactive power control on the new power system, so as to improve the accuracy of reactive power control and the stability of the voltage of the new power system.

[0126] Referring to FIG. 3, which is a flow chart of an active power output adjustment method provided by an embodiment of the present disclosure, the method comprises:

[0127] S301: determining whether there is a first new energy power generation system with a current active power less than a maximum active power, if yes, performing the step of S302; if no, repeatedly performing the step of S301.

[0128] The maximum active power P i_mpptPmax: the maximum active power of the wind power generation system or the photovoltaic power generation system under the current wind speed or light condition. If the current active power P i_实时 of the new energy power generation system such as the wind power generation system or the photovoltaic power generation system is less than the maximum active power P i_mppt , it indicates that the first new energy power generation system can generate more active power under the current light or wind speed condition for the purpose of stabilizing the grid voltage, but is limited by the rated apparent power, and the first new energy power generation system generates or absorbs a certain amount of reactive power, so that the active power cannot continue to increase, and the active power is limited by the reactive power. Therefore, steps S302-S307 can be performed to replace the reactive power of the first new energy power generation system whose active power is limited by other reactive resources, reduce the reactive power of the first new energy power generation system under the premise of maintaining system voltage stability, so that the first new energy power generation system generates more active power and improves power generation income.

[0129] S302: determining a first adjustment direction of the reactive power adjustment of the first new energy power generation system based on the first reactive power when the first new energy power generation system reaches the maximum active power and the current reactive power of the first new energy power generation system.

[0130] The maximum reactive power Q of the new energy power generation system when reaching the maximum active power P i_mppt may be calculated based on the formula i_mppt , wherein S 额定 is the rated apparent power of the new energy power generation system; if the current reactive power of the new energy power generation system is positive, "+" in the formula is taken as "+" ; if the current reactive power of the new energy power generation system is negative, "+" in the formula is taken as "-". The reactive power of the first new energy power generation system is adjusted from the current reactive power Q i_实时 to the maximum reactive power Q i_mppt , and the current active power of the first new energy power generation system can reach the maximum active power P i_mppt . The reactive power of the first new energy power generation system is adjusted from Q i_实时 to Q i_mppt , and the direction of the reactive power adjustment is the first adjustment direction.

[0131] S303: determining a total reactive power adjustable amount of each reactive resource in a second adjustment direction based on the reactive power threshold of each reactive resource except the first new energy power generation system and the current reactive power of each reactive resource.

[0132] The second adjustment direction is opposite to the first adjustment direction.

[0133] For example, if the Qi_实时 = 5MVar, Q i_mppt = 3MVar, the reactive power of the first new energy power generation system needs to be adjusted downward, and the first adjustment direction is "-"; at this time, the total reactive power of the new power system will decrease, in order to keep the total reactive power of the new power system unchanged, the reactive power of each reactive resource except the first new energy power generation system needs to be adjusted in the opposite direction, that is, the reactive power of each reactive resource except the first new energy power generation system is adjusted in the second adjustment direction "+", and then the total reactive power adjustable amount of each reactive resource except the first new energy power generation system in the second adjustment direction needs to be determined, so as to determine whether the reactive power adjustment amount (Q i_实时 -Q i_mppt ) of the first new energy power generation system can be completely allocated to other reactive resources.

[0134] S304: determine whether the absolute value of the difference between the current reactive power of the first new energy power generation system and the first reactive power is less than or equal to the total reactive power adjustable amount, if yes, execute the steps of S305-S306; if no, execute the steps of S307-S308.

[0135] In this embodiment, the total reactive power adjustable amount of each reactive resource except the first new energy power generation system is denoted as Q 可调 , wherein Q 可调 is the total reactive power adjustable amount in the same direction as (Q i_实时 -Q i_mppt ). The reactive power adjustment of the first new energy power generation system has the following two cases:

[0136] Case one, if |(Q i_实时 -Q i_mppt )|≤Qadjustable, (Q i_实时 -Q i_mppt ) can be balanced by the reactive resources except the first new energy power generation system, at this time, the steps of S304-S305 can be executed, and the reactive power of the first new energy power generation system is adjusted to the maximum reactive power Q i_mppt , so that the current active power of the first new energy power generation system reaches the maximum active power P i_mppt , and the reactive adjustment amount (Q i_实时 -Q i_mppt ) of the first new energy power generation system can be allocated to the reactive resources except the first new energy power generation system based on the adjustment priority of each reactive resource.

[0137] Case two, if |(Q i_实时 -Q i_mppt )|>Qadjustable, (Q i_实时 -Q i_mpptIf the reactive power cannot be completely balanced by any reactive power resources other than the primary renewable energy generation system, then Q can be... 可调 As the reactive power regulation component of the primary new energy power generation system, it strives to approach the maximum reactive power Q. i_mppt The reactive power of the first new energy power generation system is adjusted in the direction of [the adjustment], and the reactive power of all reactive resources other than the first new energy power generation system is adjusted to the reactive power threshold, which is [the threshold value is related to (Q)]. i_实时 -Q i_mppt The reactive power threshold in the same direction. For example, (Q i_实时 -Q i_mppt If (Q) is greater than 0, then the reactive power threshold is the upper limit of reactive power; i_实时 -Q i_mppt If the reactive power threshold is less than 0, then the reactive power threshold is the lower limit of reactive power. Therefore, without changing the total reactive power in the new power system, the current active power of the first new energy power generation system can be made as close as possible to the maximum active power P. i_mppt This will enable the first new energy power generation system to generate more active power.

[0138] S305: Adjust the reactive power of the first new energy power generation system to the first reactive power.

[0139] S306: Based on the preset adjustment priority of each reactive power resource, the difference between the current reactive power of the first new energy power generation system and the first reactive power is allocated to reactive power resources other than the first new energy power generation system.

[0140] As an example of scenario one, the SVG's upgrade priority is 1, while the upgrade priority for wind power systems, photovoltaic power systems, and energy storage systems is 2. The SVG's reactive power cap is 10 MVar, and the current reactive power is 5 MVar. The energy storage system's reactive power cap is 50 MVar, and the current reactive power is 20 MVar. The wind power system's reactive power cap is 20 MVar, the current reactive power is 15 MVar, the current active power is 18 MW, and the rated apparent power is 25 MVA. The photovoltaic power system's reactive power cap is 35 MVar, the current reactive power is 30 MVar, the current active power is 38 MW, and the rated apparent power is 50 MVA. The maximum active power P of the wind power system... 风电_mppt =23MW; Maximum active power P of the photovoltaic power generation system 光伏_mppt =45MW. It can be seen that under this condition, the current active power of both the wind power system and the photovoltaic power system is less than their corresponding maximum active power, thus limiting the active power output of both systems. Therefore, based on equation (5): The maximum reactive power of the wind power generation system when it reaches its maximum active power is calculated separately. The maximum reactive power of a photovoltaic power generation system when it reaches its maximum active power is (Q 风电_实时 -Q 风电_mppt ) = 15 - 9.8 = 5.2MVar, (Q 光伏_实时 -Q 光伏_mppt The reactive power of the SVG is 30 - 21.8 = 8.2 MVar, and the reactive power of the energy storage system is 10 - 5 = 5 MVar. Therefore, if the reactive power of the first new energy power generation system is adjusted to its maximum, the first new energy power generation system needs to reduce its reactive power, resulting in a total reactive power adjustment of 5.2 + 8.2 = 13.4 MVar. The total reactive power that can be increased from all reactive resources except the first new energy power generation system is (10 - 5) + (50 - 20) = 35 MVar, which is greater than 13.4 MVar. Therefore, the total reactive power of the first new energy power generation system (Q) is... i_实时 -Q i_mppt The reactive power of the primary renewable energy generation system (i.e., wind power and photovoltaic power) can be balanced by reactive resources other than the primary renewable energy generation system, and the reactive power of the primary renewable energy generation system (i.e., wind power and photovoltaic power) can be adjusted to their respective maximum reactive power Q. i_mppt Based on the adjustment priority of each reactive power resource, the reactive power adjustment amount (Q) of the first new energy power generation system is... i_实时 -Q i_mppt The reactive power increase is allocated to the SVG and the energy storage system, with 5 MVar of reactive power increase allocated to the SVG and 8.4 MVar of reactive power increase allocated to the energy storage system.

[0141] Optionally, taking a new power system comprising wind power generation systems, photovoltaic power generation systems, energy storage systems, and reactive power regulation equipment as an example, where both wind power generation systems and photovoltaic power generation systems belong to new energy power generation systems. If only the active power output of the photovoltaic power generation system is limited, the reactive power of the photovoltaic power generation system can be replaced by the wind power generation system, energy storage system, and reactive power regulation equipment; if only the active power output of the wind power generation system is limited, the reactive power of the wind power generation system can be replaced by the photovoltaic power generation system, energy storage system, and reactive power regulation equipment; if the active power output of both the photovoltaic power generation system and the wind power generation system is limited, the reactive power of the photovoltaic power generation system can be replaced by the energy storage system and reactive power regulation equipment.

[0142] S307: Adjust the reactive power of the first new energy power generation system in the first adjustment direction, and the adjustment amount is the total adjustable reactive power.

[0143] S308: Adjust the reactive power of each reactive resource, except for the first new energy power generation system, to its respective reactive power threshold in the second adjustment direction.

[0144] Optionally, the steps S301-S308 can be executed after step S201, for example, after step S214. Through the steps S301-S308, the active power of the new energy power generation system of the new power system can be further improved in the case of stabilizing the voltage of the new power system, and the power generation benefit can be improved.

[0145] Referring to FIG. 4, which is a schematic diagram of a reactive voltage control device provided by the embodiment of the present disclosure, the device comprises a monitoring module 401, a first determining module 402, a second determining module 403, a calculating module 404, and an output module 405.

[0146] The monitoring module 401 is configured to monitor the current operating parameters of the grid-connected point of the new power system.

[0147] The first determining module 402 is configured to determine the total reactive power adjustment of the current system based on the target operating parameters in the case that the absolute value of the difference between the current operating parameters and the target operating parameters is greater than a preset deviation value.

[0148] The second determining module 403 is configured to determine the first adjustable amount of each reactive resource based on the difference between the current reactive power and the reactive reference value of each reactive resource in the case that the total reactive power adjustment direction corresponding to the total reactive power adjustment is opposite to the current reactive direction of each reactive resource; the reactive resource includes the new energy power generation system, the energy storage system, and the reactive adjustment device.

[0149] The calculating module 404 is configured to calculate the reactive power adjustment amount of each reactive resource based on the difference between the total reactive power adjustment and the first adjustable total amount, the reactive power threshold of each reactive resource, and a preset adjustment priority; the first adjustable total amount is the sum of the first adjustable amounts of each reactive resource.

[0150] The output module 405 is configured to output the target reactive power of each reactive resource based on the reactive power adjustment amount and the current reactive power of each reactive resource.

[0151] Therefore, in the embodiment of the present disclosure, in the case that the total reactive power adjustment direction corresponding to the total reactive power adjustment is opposite to the current reactive direction of each reactive resource, the reactive reference value Q base , the total reactive power adjustment is distributed, which can avoid the reactive resources with opposite reactive directions due to reactive distribution, reduce the mutual internal consumption between the reactive resources, and improve the uniformity of the internal reactive distribution of the new power system after the reactive distribution.

[0152] Optionally, the computing module 404 comprises: a determining unit, a first allocating unit, and a calculating unit; the determining unit is configured to determine, in the case that the total reactive power adjustment amount is greater than the first total adjustable amount, a second adjustable amount of each reactive power resource in the total reactive power adjustment direction based on the reactive power threshold of each reactive power resource; the allocating unit is configured to allocate the difference between the total reactive power adjustment amount and the first total adjustable amount based on the second adjustable amount of each reactive power resource and the preset adjustment priority to obtain a second adjustment amount of each reactive power resource; if the sum of the second adjustable amounts of the same-level reactive power resources of the same adjustment priority is greater than the sum of the second adjustment amounts of the same-level reactive power resources, the second adjustment amount of each same-level reactive power resource is determined based on the proportion of the second adjustable amount of each same-level reactive power resource in the sum of the second adjustable amounts of the same-level reactive power resources; and the calculating unit is configured to calculate the sum of the first adjustable amount and the second adjustment amount of each reactive power resource to obtain the reactive power adjustment amount of each reactive power resource.

[0153] Optionally, the computing module 404 comprises: a second allocating unit; the second allocating unit is configured to, in the case that the total reactive power adjustment amount is less than or equal to the first total adjustable amount, allocate the total reactive power adjustment amount based on the first adjustable amount of each reactive power resource and the preset adjustment priority to obtain the reactive power adjustment amount of each reactive power resource; if the sum of the first adjustable amounts of the same-level reactive power resources of the same adjustment priority is greater than the sum of the reactive power adjustment amounts of the same-level reactive power resources, the reactive power adjustment amount of each same-level reactive power resource is determined based on the proportion of the first adjustable amount of each same-level reactive power resource in the sum of the first adjustable amounts of the same-level reactive power resources.

[0154] Optionally, the reactive power voltage control device provided by the embodiments of the present disclosure further comprises: a third determining module; the third determining module is configured to, in the case that the total reactive power adjustment direction corresponding to the total reactive power adjustment amount is the same as the current reactive power direction of each reactive power resource, determine a second adjustable amount of each reactive power resource in the total reactive power adjustment direction based on the reactive power threshold of each reactive power resource; allocate the total reactive power adjustment amount based on the second adjustable amount of each reactive power resource and the preset adjustment priority to obtain the reactive power adjustment amount of each reactive power resource; if the sum of the second adjustable amounts of the same-level reactive power resources of the same adjustment priority is greater than the sum of the reactive power adjustment amounts of the same-level reactive power resources, the reactive power adjustment amount of each same-level reactive power resource is determined based on the proportion of the second adjustable amount of each same-level reactive power resource in the sum of the second adjustable amounts of the same-level reactive power resources.

[0155] Optionally, the reactive power and voltage control device provided by the embodiments of the present disclosure further comprises: a circulating current management module; and one or more of the following: in the case that there are a first reactive power resource and a second reactive power resource with opposite reactive power directions in the new power system, the reactive power of the first reactive power resource is adjusted to a reactive power reference value, and the total reactive power adjustment amount of the first reactive power resource is distributed to one or more of the second reactive power resources according to preset adjustment priorities of the reactive power resources; and the absolute value of the current total reactive power of the first reactive power resource is less than the absolute value of the current total reactive power of the second reactive power resource.

[0156] Optionally, the reactive power and voltage control device provided by the embodiments of the present disclosure further comprises: an active power adjustment module, configured to, in the case that there is a first new energy power generation system with a current active power less than a maximum active power, adjust the reactive power of the first new energy power generation system towards a direction approaching a first reactive power based on the first reactive power when the first new energy power generation system reaches the maximum active power and reactive power thresholds of reactive power resources other than the first new energy power generation system, while keeping the sum of the reactive power of the reactive power resources unchanged.

[0157] Optionally, the active power adjustment module comprises: a first direction determination unit, a second direction determination unit, a first reactive power adjustment unit and a second reactive power adjustment unit; wherein the first direction determination unit is configured to determine a first adjustment direction of the reactive power adjustment of the first new energy power generation system based on the first reactive power when the first new energy power generation system reaches the maximum active power and the current reactive power of the first new energy power generation system; the second direction determination unit is configured to determine a total reactive power adjustment amount of the reactive power resources in a second adjustment direction based on the reactive power thresholds of the reactive power resources other than the first new energy power generation system and the current reactive power of the reactive power resources; the second adjustment direction is opposite to the first adjustment direction; the first reactive power adjustment unit is configured to, in the case that the absolute value of the difference between the current reactive power of the first new energy power generation system and the first reactive power is less than or equal to the total reactive power adjustment amount, adjust the reactive power of the first new energy power generation system to the first reactive power; and based on preset adjustment priorities of the reactive power resources, distribute the difference between the current reactive power of the first new energy power generation system and the first reactive power to the reactive power resources other than the first new energy power generation system; and the second reactive power adjustment unit is configured to, in the case that the absolute value of the difference between the current reactive power of the first new energy power generation system and the first reactive power is greater than the total reactive power adjustment amount, adjust the reactive power of the first new energy power generation system towards the first adjustment direction, and the adjustment amount is the total reactive power adjustment amount; and adjust the reactive power of the reactive power resources other than the first new energy power generation system to the reactive power threshold in the second adjustment direction.

[0158] Optionally, in the case that the current operating parameter is the current system voltage or the current reactive power, the first determining module 402 is configured to: in the case that the absolute value of the difference between the current operating parameter and the target operating parameter is greater than the preset deviation value, determine the total amount of reactive power adjustment of the current system based on the difference between the target operating parameter and the current operating parameter.

[0159] Optionally, in the case that the current operating parameter is the current power factor, the first determining module 402 is configured to: in the case that the absolute value of the difference between the current operating parameter and the target operating parameter is greater than the preset deviation value, determine the total amount of reactive power adjustment of the current system based on the target operating parameter and the active power of the grid connection point of the new power system.

[0160] Referring to FIG. 5, which is a structure diagram of a reactive voltage control device provided by an embodiment of the present disclosure, the device comprises a memory 501 and a processor 502.

[0161] The memory 501 is configured to store program code and transmit the program code to the processor 502.

[0162] The processor 502 is configured to execute the steps of the reactive voltage control method in any of the above embodiments according to the program code.

[0163] The present disclosure also provides a computer program product, which, when running on at least one computing device, causes the at least one computing device to implement the reactive voltage control method in any of the above embodiments.

[0164] The present disclosure also provides a new power system, which comprises an automatic voltage control system and a plurality of reactive resources; the reactive resources comprise at least one of a new energy power generation system, an energy storage system, and a reactive power adjustment device.

[0165] The automatic voltage control system is electrically connected with the plurality of reactive resources.

[0166] The automatic voltage control system is configured to adjust the reactive power of each reactive resource based on the reactive voltage control method in any of the above embodiments.

[0167] It can be understood that the automatic voltage control (AVC) system in the present embodiment is an AVC substation, and the AVC master station is usually located in the power grid dispatching center or control center and works cooperatively with the AVC substations distributed throughout the network. As an example, the target operating parameter can be issued by the AVC master station to the AVC substation.

[0168] The above merely provides one specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A reactive power voltage control method, comprising: monitoring a current operating parameter of a new power system grid connection point; if an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, determining a total reactive power adjustment amount of a current system based on the target operating parameter; if a total reactive power adjustment direction corresponding to the total reactive power adjustment amount is opposite to a current reactive power direction of each reactive power resource, determining a first adjustable amount of each reactive power resource based on a difference between a current reactive power and a reactive power reference value of each reactive power resource; calculating a reactive power adjustment amount of each reactive power resource based on a difference between the total reactive power adjustment amount and a first adjustable total amount, a reactive power threshold of each reactive power resource, and a preset adjustment priority, wherein the first adjustable total amount is a sum of the first adjustable amounts of the reactive power resources; outputting a target reactive power of each reactive power resource based on the reactive power adjustment amount and the current reactive power of each reactive power resource.

2. The method of claim 1, wherein, The calculating of the reactive power adjustment amount of each reactive power resource based on the difference between the total reactive power adjustment amount and the first adjustable total amount, the reactive power threshold of each reactive power resource, and the preset adjustment priority comprises: if the difference between the total reactive power adjustment amount and the first adjustable total amount is greater than 0, determining a second adjustable amount of each reactive power resource in the total reactive power adjustment direction based on the reactive power threshold of each reactive power resource; allocating the difference between the total reactive power adjustment amount and the first adjustable total amount to obtain a second adjustment amount of each reactive power resource based on the second adjustable amount of each reactive power resource and the preset adjustment priority, wherein if a sum of the second adjustable amounts of a plurality of same-level reactive power resources with the same adjustment priority is greater than a sum of the second adjustment amounts of the plurality of same-level reactive power resources, determining the second adjustment amount of each same-level reactive power resource based on a proportion of the second adjustable amount of each same-level reactive power resource in the sum of the second adjustable amounts of the same-level reactive power resources; calculating a sum of the first adjustable amount and the second adjustment amount of each reactive power resource to obtain the reactive power adjustment amount of each reactive power resource.

3. The method of claim 1, wherein, The calculating of the reactive power adjustment amount of each reactive power resource based on the difference between the total reactive power adjustment amount and the first adjustable total amount, the reactive power threshold of each reactive power resource, and the preset adjustment priority comprises: if the difference between the total reactive power adjustment amount and the first adjustable total amount is less than or equal to 0, allocating the total reactive power adjustment amount to obtain the reactive power adjustment amount of each reactive power resource based on the first adjustable amount of each reactive power resource and the preset adjustment priority, wherein if a sum of the first adjustable amounts of a plurality of same-level reactive power resources with the same adjustment priority is greater than a sum of the reactive power adjustment amounts of the plurality of same-level reactive power resources, determining the reactive power adjustment amount of each same-level reactive power resource based on a proportion of the first adjustable amount of each same-level reactive power resource in the sum of the first adjustable amounts of the same-level reactive power resources.

4. The method of claim 1, wherein, After the determining of the total reactive power adjustment amount of the current system based on the target operating parameter if the absolute value of the difference between the current operating parameter and the target operating parameter is greater than the preset deviation value, the method further comprises: if the total reactive power adjustment direction corresponding to the total reactive power adjustment amount is the same as the current reactive power direction of each reactive power resource, determining a second adjustable amount of each reactive power resource in the total reactive power adjustment direction based on the reactive power threshold of each reactive power resource; The method further comprises:

5. The method according to any one of claims 1 to 4, wherein, The method further comprises: If the first reactive resource and the second reactive resource exist in the new power system, the reactive power of the first reactive resource is adjusted to a reactive reference value, and a total reactive power adjustment amount of the first reactive resource is distributed to one or more of the second reactive resources according to a preset adjustment priority of each reactive resource; the absolute value of the current total reactive power of the first reactive resource is less than the absolute value of the current total reactive power of the second reactive resource.

6. The method according to any one of claims 1 to 4, wherein, The method further comprises: If the first new energy power generation system exists and the current active power is less than the maximum active power, the reactive power of the first new energy power generation system is adjusted in a direction approaching the first reactive power based on the first reactive power when the first new energy power generation system reaches the maximum active power and the reactive power threshold of each reactive resource except the first new energy power generation system, while keeping the sum of the reactive power of each reactive resource unchanged.

7. The method of claim 6, wherein, The method further comprises: If the first new energy power generation system exists and the current active power is less than the maximum active power, the reactive power of the first new energy power generation system is adjusted in a direction approaching the first reactive power based on the first reactive power when the first new energy power generation system reaches the maximum active power and the reactive power threshold of each reactive resource except the first new energy power generation system, while keeping the sum of the reactive power of each reactive resource unchanged. The method further comprises: The first adjustment direction of the reactive power adjustment of the first new energy power generation system is determined based on the first reactive power when the first new energy power generation system reaches the maximum active power and the current reactive power of the first new energy power generation system; The total reactive adjustable amount of each reactive resource in a second adjustment direction is determined based on the reactive power threshold of each reactive resource except the first new energy power generation system and the current reactive power of each reactive resource; the second adjustment direction is opposite to the first adjustment direction. If the absolute value of the difference between the current reactive power and the first reactive power of the first new energy power generation system is less than or equal to the total reactive adjustable amount, the reactive power of the first new energy power generation system is adjusted to the first reactive power; the difference between the current reactive power and the first reactive power of the first new energy power generation system is distributed to the reactive resources except the first new energy power generation system based on the preset adjustment priority of each reactive resource. If an absolute value of a difference between the current reactive power of the first new energy power generation system and the first reactive power is greater than the total reactive power adjustable amount, the reactive power of the first new energy power generation system is adjusted to the first adjustment direction, and an adjustment amount is the total reactive power adjustable amount; the reactive power of each reactive resource except the first new energy power generation system is adjusted to a respective reactive power threshold in the second adjustment direction.

8. The method of any one of claims 1-4, wherein, The current operating parameter includes a current system voltage or a current reactive power; and if an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, a total reactive power adjustment amount of a current system is determined based on the target operating parameter, including: If an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, a total reactive power adjustment amount of a current system is determined based on a difference between the target operating parameter and the current operating parameter.

9. The method of any one of claims 1-4, wherein, The current operating parameter includes a current power factor; and if an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, a total reactive power adjustment amount of a current system is determined based on the target operating parameter, including: If an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, a total reactive power adjustment amount of a current system is determined based on the target operating parameter and an active power of a grid connection point of the new power system.

10. The method of any one of claims 1-4, wherein, The reactive reference value approaches 0.

11. A reactive voltage control device comprising: The monitoring module, the first determination module, the second determination module, the calculation module, and the output module; The monitoring module is configured to monitor a current operating parameter of the grid connection point of the new power system. The first determination module is configured to determine, in a case where an absolute value of a difference between the current operating parameter and a target operating parameter is greater than a preset deviation value, a total reactive power adjustment amount of a current system based on the target operating parameter. The second determination module is configured to determine, in a case where a total reactive power adjustment direction corresponding to the total reactive power adjustment amount is opposite to a current reactive power direction of each reactive resource, a first adjustable amount of each reactive resource based on a difference between a current reactive power of each reactive resource and a reactive reference value; the reactive resource includes a new energy power generation system, an energy storage system, and a reactive power adjustment device. The calculation module is configured to calculate, based on a difference between the total reactive power adjustment amount and a first total adjustable amount, a reactive power threshold of each reactive resource, and a preset adjustment priority, a reactive power adjustment amount of each reactive resource; the first total adjustable amount is a sum of the first adjustable amounts of the reactive resources. The output module is configured to output a target reactive power of each reactive resource based on the reactive power adjustment amount of each reactive resource and a current reactive power.

12. A reactive voltage control device comprising: The memory and the processor; The memory is configured to store program code and transmit the program code to the processor; The processor is configured to execute steps of the reactive voltage control method according to the program code.

13. A computer program product, when the computer program product is run on at least one computing device, the at least one computing device implements the reactive voltage control method according to any one of claims 1-10.

14. A novel power system, comprising an automatic voltage control system and a plurality of reactive power resources; the reactive power resources comprising at least one of a new energy power generation system, an energy storage system, and a reactive power regulating device; the automatic voltage control system being electrically connected to the plurality of reactive power resources; the automatic voltage control system being configured to adjust the reactive power of each reactive power resource based on the reactive power voltage control method of any one of claims 1-10.

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