Method and system for controlling steady-state operation of different SVGs (Static Var Generator) of new energy collection station

Abstract

The invention discloses a steady-state operation control method and system for different SVGs of a new energy pooling station, and relates to the field of new energy power generation, and the method comprises the steps: configuring SVGs at a new energy side and a pooling station side at the same time, and determining different types, capacities and installation positions of the SVGs; sVG control targets and principles in different voltage periods are proposed; and control strategies of different types of SVGs in different time periods are obtained for adaptive control. Compared with the prior art, the reactive power output and control targets of different types of SVGs can be coordinated, the stability of the voltage of the new energy collection station is facilitated, and the overall effect and economical efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy power generation, and in particular to a method and system for controlling steady-state operation of different SVGs in a renewable energy collection station. Background Art

[0002] With the large-scale development and utilization of new energy, new energy stations have experienced explosive growth. Due to the volatility and randomness of new energy, in order to make the active power and voltage control of new energy stations more reasonable, it is usually required to configure dynamic reactive power compensation devices SVG at new energy stations. This type of SVG mainly controls the station output power to maintain the unit power factor. At the same time, for large-scale new energy collection stations, since the voltage fluctuates more with the load, it is usually considered to configure a certain proportion of SVG at the new energy collection station. This type of SVG is partly for the needs of voltage control, and partly for the needs of improving the short-circuit ratio of new energy multi-feed. In order to meet these two types of needs at the same time, a grid-type SVG is generally selected. This type of device can not only control the reactive voltage, but also provide short-circuit current during faults. Different types of SVG lack coordinated control strategies due to different control targets, especially for renewable energy collection stations. Since the voltage of the collection station varies greatly with the output of renewable energy, the control target of SVG also needs to follow the voltage when operating at different scales during steady-state operation. Its coordinated control strategy is also different. For example, when the steady-state voltage fluctuates to the edge of the allowable value, if the SVG of the collection station still maintains unit power factor operation, it may lead to unqualified voltage quality. At the same time, a large number of dynamic reactive power regulation functions of SVG are idle. Therefore, it is necessary to consider coordinating the control of different types of SVG, and to formulate control principles and change the active power control target of SVG under different voltage operating ranges. Summary of the invention

[0003] In view of the above existing problems, the present invention aims to better coordinate different types of SVG devices in the new energy collection station and improve the voltage quality of the new energy collection station. The voltage stability of the new energy collection station is improved. The present invention proposes a coordinated control strategy for steady-state operation of different types of SVG in the new energy collection station. By determining different operation control targets of different types of SVG in different voltage operation periods, the operation control strategy and reactive operation range of SVG in different time periods are selected. The dynamic reactive power of SVG is fully utilized to improve the voltage stability of the new energy collection station.

[0004] In order to solve the above technical problems, a steady-state operation control method of different SVGs in a new energy collection station is proposed, including:

[0005] At the same time, SVG is configured on the new energy side and the collection station side to determine the different types, capacities and installation locations of SVG; the control objectives and principles of SVG in different voltage periods are proposed; and the control strategies of different types of SVG in different periods are obtained for adaptive control.

[0006] As a preferred solution of the steady-state operation control method of different SVGs for a new energy collection station described in the present invention, the different types of SVGs include two types: the new energy collection station includes a following-grid type SVG installed at the sending end of the new energy collection line and a networking type SVG installed on the collection station side.

[0007] As a preferred solution of the steady-state operation control method of different SVGs in a new energy collection station described in the present invention, the different types of SVGs also include: defining that the SVG is installed at the sending end side of the i-th collection line of new energy, defined as SVG i , the reactive capacity is Q i , the SVG on the new energy side is a grid-following type control.

[0008] The SVG of the new energy collection station is defined as SVG j , the capacity is Q j The steady-state long-term overload capacity is k times, and the SVG on the new energy side is a grid-type control.

[0009] As a preferred solution of the steady-state operation control method of different SVGs in a new energy collection station described in the present invention, wherein: the SVG control targets and principles in different voltage periods include: when the bus voltage fluctuation range of the collection station is -ΔU ki <ΔU<ΔU ki When the control target of SVG is reactive output Q output The principle is minimum.

[0010] When the bus voltage fluctuation range is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki and ΔU ki <ΔU<ΔU ki +ΔU t1 When SVG controls the bus voltage to the optimal level, target L1 is used, and all types of SVG maintain partial dynamic reactive power output.

[0011] When the voltage deviates further, the bus voltage fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) and (ΔU ki +ΔU t1 )<ΔU<ΔUki +ΔU t1 +ΔU t2 When SVG takes the optimal control voltage as target L2, the reactive output of various SVGs is in the maximum range of steady-state long-term operation.

[0012] Among them, ΔU ki , ΔU t1 , ΔU t2 The value is set according to the control target of the station.

[0013] As a preferred solution of the steady-state operation control method of different SVGs in a new energy collection station described in the present invention, the SVG control objectives and principles in different voltage periods also include optimizing the control strategy of SVG by an adaptive multi-objective evolutionary algorithm, setting reactive output, bus voltage optimal target and control voltage optimal target as optimization targets:

[0014]

[0015] st-ΔU ki <ΔU<ΔU ki ,

[0016] Q i ∈[Q min ,Q max ]

[0017] Among them, α1 is a function of reactive power output, α2 is a function of the optimal bus voltage target, α3 is a function of the optimal control voltage target, w1, w2 and w3 are weight coefficients to balance the targets reasonably, Q max is the maximum reactive power output in the system, Q min It is the maximum reactive power output in the system.

[0018] As a preferred solution of the steady-state operation control method of different SVGs in a new energy collection station described in the present invention, the control strategy includes: when the voltage fluctuation range of the collection station is -ΔU ki <ΔU<ΔU ki If the SVG on the new energy side is within i The SVG on the collection station side is designed to control the unit power factor of the collection line at the installation point. j The reactive power output is 0.

[0019] When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the SVG on the new energy sidei Switch to constant voltage control mode, reactive operation range is -Q i *ki i i *ki, ki value is less than 1, SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j <Q<Q j .

[0020] When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 SVG on the new energy side i Switch to constant voltage control mode, reactive operation range is -Q i i i , SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j *k <Q<Q j *k.

[0021] As a preferred solution of the steady-state operation control method of different SVGs for a new energy collection station described in the present invention, the adaptive control includes: when the voltage fluctuation range of the collection station is -ΔU ki <ΔU<ΔU ki Within 10 minutes, through real-time monitoring and intelligent systems, SVG i Dynamically adjust power factor targets based on environmental changes.

[0022] When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the reactive power is low, the nonlinear control is used to stabilize the reactive power output range under small fluctuations and maintain the optimal allocation of resources.

[0023] When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 ​​​​)<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 When the system is running at its optimal state, a state space model is established to consider the dynamic interactions of all SVGs and use Kalman filtering for real-time state estimation to keep the system in its optimal operating state.

[0024] Another object of the present invention is to provide a steady-state operation control system for different SVGs in a new energy collection station. In order to ensure that the new energy collection station can achieve accurate regulation of reactive power under various voltage fluctuations by reasonably configuring and optimizing the control strategy of SVG, the bus voltage can be stabilized and the operation quality of the power grid can be improved. The system aims to dynamically adjust the operating state of SVG according to the real-time voltage fluctuation through an adaptive control method, ensure the efficient access and utilization of new energy power generation, reduce the system operation cost, and improve the reliability and economy of the power grid.

[0025] As a preferred solution of the different SVG steady-state operation control system of a new energy collection station described in the present invention, it is characterized by including an SVG configuration module, an SVG control strategy optimization module, and an SVG adaptive control module.

[0026] The SVG configuration module analyzes the needs of the new energy collection station, determines the capacity requirements of the SVG, configures a following-type SVG on the new energy side, configures a networking-type SVG on the collection station side, determines the installation location and capacity, and defines the type and control parameters of the SVG according to the specific conditions of the new energy collection station.

[0027] The SVG control strategy optimization module determines the SVG control objectives and principles for different voltage periods, balances the optimization objectives, and outputs the optimized SVG control strategy.

[0028] The SVG adaptive control module monitors the bus voltage fluctuation of the collection station in real time, obtains control strategies for different types of SVGs in different time periods, and performs adaptive control.

[0029] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the steps of the steady-state operation control method of different SVGs of a new energy collection station are implemented.

[0030] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the steady-state operation control method of different SVGs of a new energy collection station are implemented.

[0031] Beneficial effects of the present invention: The present invention fully utilizes the dynamic reactive voltage regulation capability of different types of SVG in the new energy collection station, improves the bus voltage quality of the new energy collection station through a coordinated control strategy, and improves the voltage stability.

[0032] The present invention changes the control target of SVG when the voltage fluctuates in different ranges. When the voltage fluctuation is small, the SVG takes economy as the goal. When the bus voltage fluctuates greatly, the SVG control strategy is changed to consider the system operation safety as the goal. The present invention fully takes into account the economy and safety of different types of SVG operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0034] Figure 1 An overall flow chart of a method for controlling steady-state operation of different SVGs in a new energy collection station provided by an embodiment of the present invention.

[0035] Figure 2 A main wiring diagram of a 220 kV large-scale new energy collection station for a new energy collection station with different SVG steady-state operation control methods provided by an embodiment of the present invention.

[0036] Figure 3 A system module diagram of a different SVG steady-state operation control system for a new energy collection station provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0040] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1, reference Figure 1-Figure 2 , which is the first embodiment of the present invention, and provides a method for controlling steady-state operation of different SVGs in a new energy collection station, including:

[0044] S1: SVG is configured on both the new energy side and the aggregation station side to determine the different types, capacities and installation locations of SVG.

[0045] Furthermore, the new energy collection station includes two types: a grid-following SVG installed at the sending end of the new energy collection line and a grid-building SVG installed on the collection station side.

[0046] SVG is installed on the sending end of the new energy collection line, defined as SVG i , the reactive capacity is Q i , the SVG on the new energy side is a grid-following type control.

[0047] The SVG of the new energy collection station is defined as SVGj , the capacity is Q j The steady-state long-term overload capacity is k times, and the SVG on the new energy side is a grid-type control.

[0048] S2: Propose SVG control objectives and principles for different voltage periods.

[0049] Furthermore, when the bus voltage fluctuation range of the collection station is -ΔU ki <ΔU<ΔU ki When , the control target of SVG is to minimize reactive power output;

[0050] When the bus voltage fluctuation range is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki and ΔU ki <ΔU<ΔU ki +ΔU t1 When SVG controls the bus voltage to the optimal level, target L1 is used, and all types of SVG maintain partial dynamic reactive power output:

[0051]

[0052] Among them, t1 and t2 represent the start and end time respectively, σ represents the fluctuation degree of reactive power output, Q output (t) reactive power output at time t, is the average value of reactive power output during the time period, ΔU(the bus voltage at time t, U ref is the reference bus voltage, τ is the time constant of voltage response;

[0053] When the voltage deviates further, the bus voltage fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) and (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 When SVG takes the optimal control voltage as target L2, the reactive output of various SVGs is in the maximum range of steady-state long-term operation:

[0054]

[0055] Among them, ΔU ki , ΔU t1 , ΔU t2The value of is set according to the control target of the station. N is the number of control nodes, indicating the number of SVG devices involved in the control in the system. n is an index variable, indicating the nth control node. n The influence coefficient of the nth control node indicates the influence of the current node on the overall control; λ n is the attenuation coefficient, ΔU n is the voltage fluctuation of the current node, β n The amplitude coefficient of the nth control node, f n is the frequency, is the phase, χ(Q n ) is the normalized function of reactive power output range, Q n The reactive output of the nth control node, Q max It is the maximum reactive power output in the system.

[0056] It should be noted that the control strategy of SVG is optimized by adaptive multi-objective evolutionary algorithm, and reactive power output, bus voltage optimal target and control voltage optimal target are set as optimization targets:

[0057]

[0058] st-ΔU ki <ΔU<ΔU ki ,

[0059] Q i ∈[Q min ,Q max ]

[0060] Among them, α1 is a function of reactive power output, α2 is a function of the optimal bus voltage target, α3 is a function of the optimal control voltage target, w1, w2 and w3 are weight coefficients to balance the targets reasonably, Q max is the maximum reactive power output in the system, Q min It is the maximum reactive power output in the system.

[0061] S3: Obtain control strategies for different types of SVGs at different time periods for adaptive control.

[0062] Furthermore, when the voltage fluctuation range of the collection station is -ΔU ki <ΔU<ΔU ki If the SVG on the new energy side is within i The SVG on the collection station side is designed to control the unit power factor of the collection line at the installation point. j The reactive power output is 0.

[0063] When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔUki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the SVG on the new energy side i Switch to constant voltage control mode, reactive operation range is -Q i *ki i i *ki, ki value is less than 1, SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j <Q<Q j .

[0064] When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 SVG on the new energy side i Switch to constant voltage control mode, reactive operation range is -Q i i i , SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j *k <Q<Q j *k.

[0065] The steady-state operation control strategies of different types of SVGs in the new energy collection station proposed by the present invention can be expressed as shown in Table 1.

[0066] Table 1 Coordinated operation control strategies for different types of SVG

[0067]

[0068] It should be noted that the adaptive control includes: when the voltage fluctuation range of the collection station is within -ΔU ki <ΔU<ΔU ki Within 10 minutes, through real-time monitoring and intelligent systems, SVG i Dynamically adjust power factor targets based on environmental changes:

[0069] PF target (t) = PF base +k1·ΔU p (t) ​​​​

[0070] Among them, PF target (t) is the target power factor, PF base is the reference power factor, k1 represents the voltage fluctuation to power factor adjustment coefficient, ΔU p (t) is the real-time voltage deviation, and the power factor adjustment PF is:

[0071]

[0072] Among them, Y t is the active power, Q t is the reactive power.

[0073] SVG reactive output control is:

[0074]

[0075] When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the reactive power output range is stabilized under small fluctuations through nonlinear control:

[0076] U(t)=U target +k2·ΔU(t)

[0077] Among them, U target The target voltage set by the system, k2 represents the voltage regulation coefficient of voltage fluctuation to the target voltage.

[0078] Reactive output range formula:

[0079] Q i (t) = Q base (1+k3·ΔU(t))

[0080] Among them, Q base For SVG i The basic reactive power output capability of the system, k3 represents the gain factor of voltage deviation on reactive power output.

[0081] When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔUt2 When the system is running at its optimal state, a state space model is established to consider the dynamic interactions of all SVGs and use Kalman filtering for real-time state estimation:

[0082] U target (t) = U nominal +k4·ΔU t2 (t)

[0083] Q total (t) = Q i (t)+Q j (t)-k5·ΔU(t)

[0084]

[0085] Among them, U target (t) is the dynamically set target voltage, U nominal is the nominal voltage, k4 is the adjustment factor related to the voltage fluctuation increment, Q total (t) is the comprehensive reactive power output, k5 is the factor of the overall regulation capability of the system, is the system state estimated by the Kalman filter state, is the state estimate of the previous moment, A is the state transfer matrix, B is the control input matrix, u(k) is the control input, K(k) is the Kalman gain, y(k) is the observation value, and C is the observation matrix.

[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0087] Example 2, reference Figure 1-Figure 2 , which is the second embodiment of the present invention, provides a steady-state operation control method for different SVGs of a new energy collection station. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0088] Figure 2 This is a main wiring diagram of a 220 kV large-scale renewable energy collection station with different types of SVG. PV station 1, PV station 2, wind farm 1, and wind farm 2 are all connected to the 500 kV collection station medium voltage side busbar after being collected through 220 kV lines, and sent out through a single 500 kV line. Each renewable energy station is equipped with a renewable energy side SVG, which are defined as SVG11, SVG12, SVG21, and SVG22 respectively.

[0089] The new energy collection station is equipped with a set of network-forming SVG, and the basic parameters of these five sets of SVG are shown in Table 1 below.

[0090] Table 1 Basic operating parameters of different SVG

[0091]

[0092] As can be seen from Table 1, since the network-forming SVG uses larger power devices, the reactive power operating range during steady-state operation can continue to operate for 2 hours at 1.2 times the capacity. Other types of SVG operate within the two-way regulation range of the rated capacity.

[0093] Considering that the SVG aims to control the bus voltage of the new energy 220 kV collection station, assume ΔUki = 5 kV.

[0094] That is, when the voltage operates at 215 < U < 225 kV, SVG11, SVG12, SVG21, and SVG22 control the output power of each new energy station to operate at unity power factor, that is, the line only outputs active power. At this time, the network-forming SVG is recommended to be 0 Mvar.

[0095] Assume ΔUt1 = 5 kV, that is, when the voltage operating range is 210 < U < 215 or 225 < U < 230 kV, at this time, SVG11, SVG12, SVG21, and SVG22 are all switched to the constant voltage control mode, that is, to control the bus voltage of the high-voltage side of the step-up transformer of this station within the rated range.

[0096] At the same time, the reactive power operating range of the SVG takes ki = 0.8, that is, the reactive power operating range of SVG11 and SVG12 is -12 < Q < 12 Mvar, the reactive power operating range of SVG21 and SVG22 is -16 < Q < 16 Mvar, the network-forming SVG is switched to the constant voltage control, and the reactive power operating range is -60 < Q < 60 Mvar at the same time.

[0097] Assume ΔUt1 = 6 kV, that is, when the voltage operating range is 204 < U < 210 or 230 < U < 236 kV, at this time, SVG11, SVG12, SVG21, and SVG22 are all switched to the constant voltage control mode, that is, to control the bus voltage of the high-voltage side of the step-up transformer of this station within the rated range.

[0098] The reactive power operating range of SVG11 and SVG12 is -15 < Q < 15 Mvar, the reactive power operating range of SVG21 and SVG22 is -20 < Q < 20 Mvar, the network-forming SVG is switched to the constant voltage control, and the reactive power operating range is -72 < Q < 72 Mvar at the same time.

[0099] After adopting this type of coordination strategy for steady-state operation of different types of SVG, compared with the traditional new energy side SVG that always maintains unit power factor operation and the grid-type SVG that maintains constant voltage operation, its voltage control capability is stronger. It can better exert the dynamic reactive power regulation capability of different types of SVG, and has a better voltage quality control effect on the new energy station.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0101] Embodiment 3, the third embodiment of the present invention, is different from the first two embodiments in that:

[0102] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0104] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0105] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0106] Example 4, reference Figure 3 , which is the fourth embodiment of the present invention, and this embodiment provides a new energy collection station different SVG steady-state operation control system, including an SVG configuration module, an SVG control strategy optimization module, and an SVG adaptive control module.

[0107] The SVG configuration module analyzes the needs of the new energy collection station, determines the capacity requirements of the SVG, configures the following network type SVG on the new energy side, configures the network type SVG on the collection station side, determines the installation location and capacity, and defines the type and control parameters of the SVG according to the specific conditions of the new energy collection station.

[0108] The SVG control strategy optimization module determines the SVG control objectives and principles for different voltage periods, including the reactive power minimum principle, the bus voltage optimal target, and the control voltage optimal target; sets optimization objectives, including reactive power output, bus voltage optimal target, and control voltage optimal target; applies an adaptive multi-objective evolutionary algorithm to optimize the SVG control strategy; determines the weight coefficient to balance the optimization objectives; and outputs the optimized SVG control strategy.

[0109] The SVG adaptive control module monitors the bus voltage fluctuation of the collection station in real time, obtains the control strategies of different types of SVG in different time periods for adaptive control.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling steady-state operation of different SVGs in a new energy collection station, characterized in that: include, At the same time, SVG is configured on both the new energy side and the collection station side to determine the different types, capacities and installation locations of SVG; Propose SVG control objectives and principles for different voltage periods; The control strategies of different types of SVG in different time periods are obtained for adaptive control.

2. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 1, characterized in that: The different types of SVG include two types: the new energy collection station includes a following-grid type SVG installed at the sending end of the new energy collection line and a networking type SVG installed on the collection station side.

3. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 2, characterized in that: The different types of SVG include: SVG is installed on the sending end side of the new energy i-th collection line, defined as SVG i , the reactive capacity is Q i , the SVG on the new energy side is a grid-following type control; The SVG of the new energy collection station is defined as SVG j , the capacity is Q j The steady-state long-term overload capacity is k times, and the SVG on the new energy side is a grid-type control.

4. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 3, characterized in that: The SVG control objectives and principles for different voltage periods include: ki <ΔU<ΔU ki When the control target of SVG is reactive output Q output Minimum is the principle; When the bus voltage fluctuation range is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki and ΔU ki <ΔU<ΔU ki +ΔU t1 When SVG controls the bus voltage to the optimum as target L1, all types of SVG maintain partial dynamic reactive power output; When the voltage deviates further, the bus voltage fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) and (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 When SVG takes the optimal control voltage as target L2, the reactive output of various SVGs is in the maximum range of steady-state long-term operation; Among them, ΔU ki , ΔU t1 , ΔU t2 The value is set according to the control target of the station.

5. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 4, characterized in that: The SVG control objectives and principles for different voltage periods also include optimizing the SVG control strategy through an adaptive multi-objective evolutionary algorithm, setting reactive power output, bus voltage optimal objectives and control voltage optimal objectives as optimization objectives: st-ΔU ki <ΔU<ΔU ki , Q i ∈[Q min ,Q max ] Among them, α1 is a function of reactive power output, α2 is a function of the optimal bus voltage target, α3 is a function of the optimal control voltage target, w1, w2 and w3 are weight coefficients to balance the targets reasonably, Q max is the maximum reactive power output in the system, Q min It is the maximum reactive power output in the system.

6. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 5, characterized in that: The control strategy includes: when the voltage fluctuation range of the collection station is within -ΔU ki <ΔU<ΔU ki If the SVG on the new energy side is within i The SVG on the collection station side is designed to control the unit power factor of the collection line at the installation point. j Reactive output is 0; When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the SVG on the new energy side i Switch to constant voltage control mode, reactive operation range is -Q i *ki i i *ki, ki value is less than 1, SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j <Q<Q j ;​​ When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 SVG on the new energy side i Switch to constant voltage control mode, reactive operation range is -Q i i i , SVG on the aggregation station side j Switch to constant voltage control mode, reactive operation range is -Q j *k <Q<Q j *k.​​ 7. A method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in claim 6, characterized in that: The adaptive control includes: when the voltage fluctuation range of the collection station is within -ΔU ki <ΔU<ΔU ki Within 10 minutes, through real-time monitoring and intelligent systems, SVG i Dynamically adjust power factor targets based on environmental changes; When the voltage fluctuation range of the collection station is -(ΔU ki +ΔU t1 )<ΔU<-ΔU ki or ΔU ki <ΔU<ΔU ki +ΔU t1 When the reactive power output range is stabilized under small fluctuations through nonlinear control, the optimal allocation of resources is maintained; When the voltage fluctuation range of the collection station continues to increase, the fluctuation range is -(ΔU ki +ΔU t1 +ΔU t2 )<ΔU<-(ΔU ki +ΔU t1 ) or (ΔU ki +ΔU t1 )<ΔU<ΔU ki +ΔU t1 +ΔU t2 When the system is running at its optimal state, a state space model is established to consider the dynamic interactions of all SVGs and use Kalman filtering for real-time state estimation to keep the system in its optimal operating state.

8. A system using a method for controlling steady-state operation of different SVGs in a new energy collection station as claimed in any one of claims 1 to 7, characterized in that: Including SVG configuration module, SVG control strategy optimization module, SVG adaptive control module; The SVG configuration module analyzes the needs of the new energy collection station, determines the capacity requirements of the SVG, configures a network-following SVG on the new energy side, configures a network-building SVG on the collection station side, determines the installation location and capacity, and defines the type and control parameters of the SVG according to the specific conditions of the new energy collection station; The SVG control strategy optimization module determines the SVG control objectives and principles for different voltage periods, balances the optimization objectives, and outputs the optimized SVG control strategy; The SVG adaptive control module monitors the bus voltage fluctuation of the collection station in real time, obtains control strategies for different types of SVGs in different time periods, and performs adaptive control.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a method for controlling steady-state operation of different SVGs in a new energy collection station according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for controlling steady-state operation of different SVGs in a new energy collection station according to any one of claims 1 to 7 are implemented.

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