阅读说明：本技术 无功补偿的分配方法、装置、存储介质及处理器 (Reactive compensation distribution method and device, storage medium and processor ) 是由 宫成 段大鹏 赵瑞 王卫 周运斌 董晋阳 董楠 丁屹峰 王腾飞 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种无功补偿的分配方法、装置、存储介质及处理器。其中,该方法包括：获取电网内至少一个发电机组的进相深度；确定进相深度符合预定进相空间范围的至少一个发电机组作为无功补偿机组；确定至少一个无功补偿机组的离散安全裕度和平均安全裕度,其中,离散安全裕度表示各个无功补偿机组安全裕度的离散程度；基于离散安全裕度和平均安全裕度,控制无功补偿机组进行无功补偿。本发明解决了现有无功补偿分配方案不利于系统稳定的技术问题。(The invention discloses a reactive compensation distribution method, a reactive compensation distribution device, a storage medium and a processor. Wherein, the method comprises the following steps: acquiring the phase advance depth of at least one generator set in the power grid; determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit; and controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin. The invention solves the technical problem that the existing reactive compensation distribution scheme is not beneficial to system stability.)

1. A method for distributing reactive power compensation, comprising:

acquiring the phase advance depth of at least one generator set in the power grid;

determining at least one generator set with the phase advance depth meeting a preset phase advance space range as a reactive compensation generator set;

determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit;

and controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

2. The method of claim 1, wherein controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin comprises:

establishing a reactive power distribution model based on the discrete safety margin and the average safety margin;

and controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

3. The method of claim 2, wherein after establishing a reactive power distribution model based on the discrete safety margin and the average safety margin, the method further comprises:

acquiring voltage parameters of each reactive compensation unit;

modifying the reactive power distribution model based on the voltage parameter.

4. The method according to claim 2, wherein controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model comprises:

analyzing the reactive power distribution model based on a particle swarm algorithm to obtain an analysis result;

and controlling the reactive power compensation unit to perform reactive power compensation based on the analysis result.

5. A reactive compensation distribution apparatus, comprising:

the acquisition unit is used for acquiring the phase advance depth of at least one generator set in the power grid;

the first determining unit is used for determining at least one generator set with the phase advancing depth conforming to a preset phase advancing space range as a reactive compensation generator set;

a second determining unit, configured to determine a discrete safety margin and an average safety margin of at least one reactive compensation unit, where the discrete safety margin represents a discrete degree of a safety margin of each reactive compensation unit;

and the control unit is used for controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

6. The apparatus of claim 5, wherein the control unit comprises:

the establishing module is used for establishing a reactive power distribution model based on the discrete safety margin and the average safety margin;

and the control module is used for controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

7. The apparatus of claim 6, further comprising:

the obtaining module is used for obtaining the voltage parameters of each reactive compensation unit after a reactive power distribution model is established based on the discrete safety margin and the average safety margin;

and the correction module is used for correcting the reactive power distribution model based on the voltage parameter.

8. The apparatus of claim 6, wherein the control module comprises:

the analysis module is used for analyzing the reactive power distribution model based on a particle swarm algorithm to obtain an analysis result;

and the control submodule is used for controlling the reactive compensation unit to perform reactive compensation based on the analysis result.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the reactive compensation distribution method according to any one of claims 1 to 4.

10. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the reactive compensation distribution method according to any one of claims 1 to 4 when running.

Technical Field

The invention relates to the field of reactive compensation, in particular to a reactive compensation distribution method, a reactive compensation distribution device, a storage medium and a processor.

Background

The large receiving-end power grid adopts extra-high voltage and long-distance power transmission, and a load center uses a large number of cable lines, which all result in large capacitance in the power grid. When the load is low in holidays or nights, a large amount of capacitive reactive power exists in the line of 220kV and above, so that the voltage amplitude of some pivot points is higher. Particularly, in the spring festival, the minimum load of a part of provincial grids is 1/3-1/5 in a small winter mode, and the problem of high voltage is most prominent. Generally, regulation measures such as withdrawing all capacitors, putting in shunt reactors, running the unit according to the required power factor, adjusting taps of a transformer, cutting light load long lines, running the unit in phase and the like are adopted. As the 220kV transformer substation is not generally provided with equipment such as a shunt reactor and a phase modulator, inductive reactive power configuration of a 220kV power grid is insufficient, reactive power balance of the 220kV power grid is more difficult to realize than that of a 500kV power grid, and the 220kV pivot point voltage is more difficult to regulate and control according to the principle of reactive layered and partitioned basic balance. Besides the consideration of planning and constructing inductive reactive power equipment, the method also needs to fully excavate the advancing operation capacity of the unit, does not need additional investment, is smooth in adjustment and is simple to operate.

However, when the unit is operated in the phase, the following problems exist: firstly, the end part of the stator generates heat, and the active output of the unit is reduced; the service voltage is reduced, and the operation of a service motor is influenced; the power angle is increased, and the static and transient stability is reduced. The unit phase advance depth is determined by the above factors, and the deeper the unit phase advance (the more reactive power is absorbed), the more serious the above problem.

When the multiple units are in phase-in operation, the reactive power absorption tasks are jointly undertaken, compared with the single-unit phase-in operation, the voltage regulation effect is better, the phase-in depth of each unit is small, and the safety margin of the system is larger. And the strategy research aiming at multi-machine coordination phase-advancing reactive power optimization distribution is less. The document uses the minimum sum of the reactive power absorbed by all the camera groups as a multi-camera reactive power distribution target, and distributes the reactive power absorbed by each unit by using the voltage sensitivity. The optimization target may cause the unit with high voltage sensitivity to have deeper phase advance and lower safety margin than other phase advance camera sets, so that the safety margin difference of each unit is larger, and the system stability is not facilitated.

Aiming at the problem that the existing reactive compensation distribution scheme is not beneficial to system stability, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the invention provides a reactive compensation distribution method, a reactive compensation distribution device, a storage medium and a processor, and at least solves the technical problem that the existing reactive compensation distribution scheme is not beneficial to system stability.

According to an aspect of an embodiment of the present invention, there is provided a reactive compensation allocation method, including: acquiring the phase advance depth of at least one generator set in the power grid; determining at least one generator set with the phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit; and controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

Optionally, controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin includes: establishing a reactive power distribution model based on the discrete safety margin and the average safety margin; and controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

Optionally, after establishing a reactive power distribution model based on the discrete safety margin and the average safety margin, the method further comprises: acquiring voltage parameters of each reactive compensation unit; modifying the reactive power distribution model based on the voltage parameter.

Optionally, controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model includes: analyzing the reactive power distribution model based on a particle swarm algorithm to obtain an analysis result; and controlling the reactive power compensation unit to perform reactive power compensation based on the analysis result.

According to another aspect of the embodiments of the present invention, there is also provided a reactive compensation distribution apparatus, including: the acquisition unit is used for acquiring the phase advance depth of at least one generator set in the power grid; the first determining unit is used for determining at least one generator set with the phase advancing depth conforming to a preset phase advancing space range as a reactive compensation generator set; a second determining unit, configured to determine a discrete safety margin and an average safety margin of at least one reactive compensation unit, where the discrete safety margin represents a discrete degree of a safety margin of each reactive compensation unit; and the control unit is used for controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

Optionally, the control unit comprises: the establishing module is used for establishing a reactive power distribution model based on the discrete safety margin and the average safety margin; and the control module is used for controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

Optionally, the apparatus further comprises: the obtaining module is used for obtaining the voltage parameters of each reactive compensation unit after a reactive power distribution model is established based on the discrete safety margin and the average safety margin; and the correction module is used for correcting the reactive power distribution model based on the voltage parameter.

Optionally, the control module comprises: the analysis module is used for analyzing the reactive power distribution model based on a particle swarm algorithm to obtain an analysis result; and the control submodule is used for controlling the reactive compensation unit to perform reactive compensation based on the analysis result.

According to another aspect of the embodiment of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored program, where the program is executed to control a device where the computer-readable storage medium is located to perform the above-mentioned reactive compensation distribution method.

According to another aspect of the embodiment of the present invention, there is also provided a processor, configured to run a program, where the program is executed when running to perform the reactive compensation distribution method described above.

In the embodiment of the invention, the phase advance depth of at least one generator set in a power grid is obtained; determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit; based on the discrete safety margin and the average safety margin, the reactive compensation units are controlled to perform reactive compensation, and reactive distribution is performed by taking the aim that the overall safety margin of multiple advancing phases is the largest and the safety margins of the units are close, so that the technical effect of ensuring the stability of reactive compensation distribution is realized, and the technical problem that the existing reactive compensation distribution scheme is not beneficial to system stability is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a flow chart of a reactive compensation distribution method according to an embodiment of the invention;

fig. 2 is a schematic diagram of a reactive power compensation distribution apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above 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 data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In accordance with an embodiment of the present invention, there is provided an embodiment of a reactive compensation allocation method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.

Fig. 1 is a flowchart of a reactive compensation distribution method according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:

step S102, obtaining the phase advance depth of at least one generator set in the power grid;

step S104, determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive power compensation generator set;

step S106, determining a discrete safety margin and an average safety margin of at least one reactive power compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive power compensation unit;

and S108, controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

In the embodiment of the invention, the phase advance depth of at least one generator set in a power grid is obtained; determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit; based on the discrete safety margin and the average safety margin, the reactive compensation units are controlled to perform reactive compensation, and reactive distribution is performed by taking the aim that the overall safety margin of multiple advancing phases is the largest and the safety margins of the units are close, so that the technical effect of ensuring the stability of reactive compensation distribution is realized, and the technical problem that the existing reactive compensation distribution scheme is not beneficial to system stability is solved.

As an alternative embodiment, controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin includes: establishing a reactive power distribution model based on the discrete safety margin and the average safety margin; and controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

As an alternative embodiment, after establishing the reactive power distribution model based on the discrete safety margin and the average safety margin, the method further comprises: acquiring voltage parameters of each reactive compensation unit; and modifying the reactive power distribution model based on the voltage parameters.

As an alternative embodiment, controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model includes: analyzing the reactive power distribution model based on a particle swarm algorithm to obtain an analysis result; and controlling the reactive power compensation unit to perform reactive power compensation based on the analysis result.

The invention also provides a preferred embodiment, which provides a multi-machine coordinated phase advance reactive power distribution method.

According to the technical scheme provided by the invention, a multi-machine coordinated phase advance distribution reactive power model is established, and a strategy which can effectively regulate and control the voltage of a junction point, has the largest overall safety margin of a multi-machine phase advance and has similar safety margins of all the machine sets is found in a phase advance space range of all the machine sets.

Optionally, the system can be provided with N generators which can run in phase_GThe ith generator has active power output of P_GiTime absorption reactive Q_GiDefining the safety margin of the unit at the moment as delta Q_GiThe larger the numerical value is, the higher the safety margin of the unit is, and the corresponding formula is as follows:

in the formula: q_Gi,PGi,minFor the unit in P_GiAnd the lower limit of the time idle work, namely the maximum phase advance depth under the active output force.

Optionally, the average safety margin of all camera groups is Δ Q_GAnd percent, representing the integral safety margin of the multi-advancing phase, wherein the larger the numerical value is, the higher the integral safety margin is, and the corresponding formula is as follows:

optionally, defining a standard deviation σ of the safety margins of the camera group, and calculating the dispersion degree of the safety margins of the units, wherein the smaller the numerical value is, the closer the safety margins of the units are, and the corresponding formula is as follows:

constructing an objective function of a multi-machine coordination progressive model, wherein the corresponding formula is as follows:

F＝min[λ₁/ΔQ_G％+λ₂σ]

in the formula: lambda [ alpha ]₁And λ₂Is the weight coefficient of the average safety margin and the standard deviation.

Optionally, the reactive power and the active power of the node satisfy the following power balance equation:

optionally, the variable constraint is:

in the formula: u shape_iIs the node voltage, and Q_Gi,PGiFor the active power output of the generator to be P_GiReactive power output in time. According to the operation of the generator, when the active power output of the generator is different, the minimum value of the reactive power output is different

Optionally, the reactive power of the generator is a control variable, the constraints of which are satisfied by setting the search boundaries. The generator terminal voltage, the plant high-voltage bus voltage and the load node voltage are all state variables, and the constraint of the state variables is processed by a penalty function, namely, an objective function of a multi-machine coordination phase advancing model is converted into an expanded objective function:

wherein, Delta U_iFor voltage threshold, N_DIs the number of voltage nodes, U_i,maxAnd U_i,minIs the upper and lower limits of the voltage, λ₃Is a penalty factor; the voltage threshold value is calculated as follows:

in the formula: u shape_iIs the node voltage, and Q_Gi,PGiFor the active power output of the generator to be P_GiReactive power output in time. The minimum value of reactive power is different when the active power of the generator is different.

In this section, a Particle Swarm Optimization (PSO) is used to solve the reactive power distribution problem of multi-machine coordinated phase advance operation, and key solving steps are set forth below.

(1) Encoding of particles

When the particles are used for space search, the space positions are respectively corresponding to the reactive power of each generator, namely each particle is N_GA dimension vector. However, in order to ensure that generators running in parallel at the same place participate in regulation at the same time, and avoid the situation that a part of units reduce excitation regulation reactive power, and other units detect voltage drop and increase excitation, so that reactive circulation is formed between parallel running, grouping regulation is adopted in the text, generators capable of running in phase in the same power plant are grouped into one group, and are grouped into m groups in total, wherein each group has m₁，m₂，…，m_mAnd a power generator. The reactive power regulating quantity of each group of generators is the same, and the boundary value of each group of generators is the maximum boundary value of the generators in the group, so that the particles are m-dimensional vectors.

Alternatively, the method of generating the initial population is as follows:

x_id＝x_id,min+r(x_id,max-x_id,min)；

wherein, the d dimension variable x of the ith particle_idThe upper and lower limit values of the control variable can be represented by x_id,minAnd x_id,maxTo indicate. And r is [0,1 ]]The random number of (1).

(2) Velocity position formula

Each iteration of the particle updates the velocity and position according to:

in the formula: the number of iterations is represented by t, the inertial weight is represented by ω, and the acceleration constant is represented by c₁，c₂Is shown as r₁And r₂In the range of [0,1]In the above-mentioned manner,for the individual optimum value of the,is a global optimum. The effect of the inertial weight ω is to enable the particle to search for a new region. Acceleration constant c₁，c₂Each particle can be oriented toAnddirection advance, let search range be [ x ]_min，x_max]. And the velocity of each dimension of the particle must be in the range of-v_max,d，v_max]In one dimension, the velocity in v cannot be exceeded_max,dThe maximum velocity of the particles must not exceed v_max。

(3) Load flow calculation

In the initial condition setting of the load flow calculation, the units participating in the phase advance operation are set as reactive compensation PQ nodes, which is different from the conventional load flow.

(4) Adaptive value calculation

The quality of the particles can be obtained by calculating the adaptive value of the particles, and the calculation of the objective function value by adopting the extended objective function can indicate the quality of the particles.

(5) Transient stability checking

Checking the influence of the obtained strategy on the transient stability of the system: and applying the reactive power distribution scheme of the unit to the system, and performing transient stability checking on all expected faults. If all the expected faults pass the checking, the next calculation can be carried out; if one or more expected faults fail to be checked, returning to continuously find the optimal solution.

(6) Convergence criterion

Particle swarm optimization in solving such problems may present local optima, which may be stalled for a while when the objective function iterates to these points. If the convergence condition is set such that the difference between the optimal solution and the average adaptation value is smaller than a certain constant, there is a defect of being too tight or too wide. The convergence condition herein is the maximum number of iterations determined by the actual situation and the iteration time.

It should be noted that the algorithm for multi-machine coordinated progressive reactive power distribution includes three parts, namely reactive power calculation, load flow calculation and transient calculation. The objective function value is obtained by combining reactive power calculation and load flow calculation. The flow of reactive power distribution based on the PSO algorithm is as follows.

Step 1: inputting original system data and various parameters of a particle swarm algorithm. The system data comprises constraint conditions of set variables, control variables and data required by load flow calculation.

Step 2: initializing population velocity and location. The individual and global optima are initially set to zero.

And step 3: and carrying out load flow calculation according to the information of the particles, and obtaining the adaptive value of each particle.

And 4, step 4: performing transient stability check, and if the transient stability check passes, performing the next step; and if the particle velocity and the particle position of each iteration are not reached, updating the particle velocity and the particle position according to the updating velocity and the position formula of the particle of each iteration, and recalculating after updating the iteration times.

And 5: and setting the position corresponding to the optimal adaptive value as a global optimal value, and updating and storing the global optimal value and the individual optimal value.

Step 6: if the iteration times reach the set maximum iteration times, stopping calculating and outputting a global optimum value; and if the iteration times are not the maximum, updating the particle speed and the particle position, and turning to the step 3 to continue updating operation after updating the iteration times.

According to yet another embodiment of the present invention, there is also provided a computer-readable storage medium including a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the reactive compensation distribution method.

According to another embodiment of the present invention, there is also provided a processor for executing a program, where the program executes the reactive compensation allocation method described above.

According to an embodiment of the present invention, there is also provided an embodiment of a reactive power compensation distribution apparatus, and it should be noted that the reactive power compensation distribution apparatus may be used to perform a reactive power compensation distribution method in the embodiment of the present invention, and the reactive power compensation distribution method in the embodiment of the present invention may be performed in the reactive power compensation distribution apparatus.

Fig. 2 is a schematic diagram of a reactive power compensation distribution apparatus according to an embodiment of the present invention, and as shown in fig. 2, the apparatus may include: the acquiring unit 22 is used for acquiring the phase advance depth of at least one generator set in the power grid; the first determining unit 24 is used for determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; a second determining unit 26, configured to determine a discrete safety margin and an average safety margin of at least one reactive compensation unit, where the discrete safety margin represents a discrete degree of the safety margin of each reactive compensation unit; and the control unit 28 is used for controlling the reactive power compensation unit to perform reactive power compensation based on the discrete safety margin and the average safety margin.

It should be noted that the obtaining unit 22 in this embodiment may be configured to execute step S102 in this embodiment, the first determining unit 24 in this embodiment may be configured to execute step S104 in this embodiment, the second determining unit 26 in this embodiment may be configured to execute step S106 in this embodiment, and the control unit 28 in this embodiment may be configured to execute step S108 in this embodiment. The modules are the same as the corresponding steps in the realized examples and application scenarios, but are not limited to the disclosure of the above embodiments.

In the embodiment of the invention, the phase advance depth of at least one generator set in a power grid is obtained; determining at least one generator set with a phase advance depth meeting a preset phase advance space range as a reactive compensation generator set; determining a discrete safety margin and an average safety margin of at least one reactive compensation unit, wherein the discrete safety margin represents the discrete degree of the safety margin of each reactive compensation unit; based on the discrete safety margin and the average safety margin, the reactive compensation units are controlled to perform reactive compensation, and reactive distribution is performed by taking the aim that the overall safety margin of multiple advancing phases is the largest and the safety margins of the units are close, so that the technical effect of ensuring the stability of reactive compensation distribution is realized, and the technical problem that the existing reactive compensation distribution scheme is not beneficial to system stability is solved.

As an alternative embodiment, the control unit comprises: the establishing module is used for establishing a reactive power distribution model based on the discrete safety margin and the average safety margin; and the control module is used for controlling the reactive power compensation unit to perform reactive power compensation based on the reactive power distribution model.

As an alternative embodiment, the apparatus further comprises: the obtaining module is used for obtaining the voltage parameters of each reactive compensation unit after a reactive power distribution model is established based on the discrete safety margin and the average safety margin; and the correction module is used for correcting the reactive power distribution model based on the voltage parameters.

As an alternative embodiment, the control module comprises: the analysis module is used for analyzing the reactive power distribution model based on the particle swarm algorithm to obtain an analysis result; and the control submodule is used for controlling the reactive compensation unit to perform reactive compensation based on the analysis result.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.