Primary frequency modulation control method and system based on central air conditioner inlet guide vane adjustment

Abstract

The application provides a primary frequency modulation control method and system based on central air conditioner inlet guide vane adjustment. In a range corresponding to spare capacity, a frequency response signal is generated, superimposed with a temperature control signal, and the inlet guide vane opening degree is controlled, so that the central air conditioner power changes to participate in the primary frequency modulation of the power system. The application takes into account the user comfort and the influence of load rebound, and ensures the rapidness of response.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system demand response, and in particular to a primary frequency modulation control method and system based on central air conditioner inlet guide vane adjustment. BACKGROUND

[0002] The statements in this section merely provide background technology related to the present application and do not necessarily constitute prior art.

[0003] New energy output is intermittent and volatile, which brings new challenges to power system power balance. The frequency safety of the power system requires that the active power imbalance of the system can keep or restore the frequency to the allowable range, and the frequency does not collapse. Primary frequency modulation plays a crucial role in frequency stability and serves as the first line of defense for frequency regulation. High proportion of renewable energy output and frequency decoupling result in the gradual scarcity of primary frequency modulation resources of the power system. In this context, only obtaining standby resources from the power generation side cannot meet the operation requirements of the future power system, and the demand side response from the load side has become a trend of future development.

[0004] During the summer peak period, the air conditioning load accounts for a high proportion in the whole network, and has great regulation potential. It has certain heat storage capacity, and changing the power in a small range will not affect the user comfort, and it is an important demand response resource. The rated power of split air conditioner is generally only a few kilowatts, while the rated power of central air conditioner can be hundreds of kilowatts, which is much higher than that of split air conditioner, and accounts for 40% of the electricity demand of building. Compared with split air conditioner, central air conditioner has greater regulation potential and is a "high-quality" demand response resource. In addition, during the operation of central air conditioner, due to the intermediate circulation of chilled water, heat can be stored not only in the form of indoor temperature gradient, but also in the form of chilled water temperature gradient, so that the influence on indoor temperature is smaller when it participates in frequency response.

[0005] However, the inventors have found that the current central air conditioner load participating in primary frequency modulation has the following problems:

[0006] (1) In terms of load modeling, most central air conditioner load models only identify the heat transfer model parameters, and lack the identification of local control system parameters. Therefore, the dynamic operation process of central air conditioner cannot be accurately simulated, and the load rebound after the participation of central air conditioner in demand side response cannot be accurately known.

[0007] (2) In terms of control mode, there are two control modes for central air conditioner participating in primary frequency modulation in existing research: using frequency converter control or adopting start-stop control. However, many existing central air conditioners do not have frequency converters, and the frequency converter needs to consume an additional 4%-8% of energy. Start-stop control will affect the equipment and easily cause the frequency shock of the power system. SUMMARY

[0008] In order to solve the problems in the prior art, the application provides a primary frequency modulation control method and system based on inlet guide vane adjustment of a central air conditioner, which takes into account user comfort and load rebound influence and ensures rapid response.

[0009] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0010] The first aspect of the application provides a primary frequency modulation control method based on inlet guide vane adjustment of a central air conditioner.

[0011] A primary frequency modulation control method based on inlet guide vane adjustment of a central air conditioner, comprising the following processes:

[0012] Within the range corresponding to the standby capacity, a frequency response signal is generated, which is superimposed with a temperature control signal to control the opening degree of the inlet guide vane, so that the power of the central air conditioner changes to participate in the primary frequency modulation of the power system.

[0013] As a further limitation of the first aspect of the application, before the frequency response signal is superimposed with the temperature control signal, the process of parameter identification of the central air conditioner control system is further included, comprising:

[0014] The PID parameters of the return water temperature, the PID parameters of the outlet water temperature and the delay time are identified.

[0015] As a further limitation of the first aspect of the application, the parameter identification result of the central air conditioner control system is obtained with the minimum deviation between the predicted value and the measured value of the central air conditioner chiller power as the target.

[0016] As a further limitation of the first aspect of the application, after the process of parameter identification of the central air conditioner control system, before the frequency response signal is superimposed with the temperature control signal, the process of determining the primary frequency modulation standby capacity range of the central air conditioner based on inlet guide vane adjustment in the frequency modulation region is further included, comprising:

[0017] The primary frequency modulation standby capacity range of the central air conditioner based on inlet guide vane adjustment in the frequency modulation region comprises:

[0018] The up-regulation frequency modulation standby capacity of the i-th central air conditioner at the k-th moment is:

[0019] The down-regulation frequency modulation standby capacity of the i-th central air conditioner at the k-th moment is:

[0020] Wherein, is the guide vane opening degree of the i-th central air conditioner at the k-th moment, is the lower limit of the guide vane opening degree of the i-th central air conditioner, is the upper limit of the guide vane opening of the i-th central air conditioner, and f(·) is a function of the power of the water chiller and the guide vane opening;

[0021] The standby capacity of the central air conditioner in the to-be-regulated frequency region is aggregated according to the partition aggregation method to obtain total up-regulation standby capacity and down-regulation standby capacity.

[0022] As a further limitation of the first aspect of the application, the function of the power of the water chiller and the guide vane opening is:

[0023] P ch = f(O IGV ) = (a0 + a1 · O IGV + a2 · O IGV 2 ) · P ch,max

[0024] wherein a0, a1, a2 are coefficients of a quadratic polynomial, O IGV is the guide vane opening, and P ch,max is the maximum power of the water chiller.

[0025] As a further limitation of the first aspect of the application, the lower limit of the guide vane opening and the upper limit of the guide vane opening of the i-th central air conditioner are:

[0026]

[0027]

[0028] wherein R u is the maximum opening rate of the guide vane opening when opening, R d is the maximum opening rate of the guide vane opening when closing, ΔT r is the complete activation time of the required primary frequency regulation standby capacity, O IGV,min is the minimum value of the guide vane opening, O IGV,max is the maximum value of the guide vane opening.

[0029] As a further limitation of the first aspect of the application, it is judged whether the current frequency of the central air conditioner control system is within the action dead zone range, if yes, no frequency response signal of the inlet guide vane is sent out; if no, a frequency response signal of the inlet guide vane is generated, and the frequency response signal is:

[0030]

[0031] wherein K AC is a unit regulation coefficient, f is the current frequency of the central air conditioner control system, f Dmin is the lower limit of the action dead zone range, and f Dmax is the upper limit of the action dead zone range.

[0032] The time of each frequency modulation is the starting time k of the frequency exceeding the range, and in each frequency modulation process, ΔO IGV Satisfy the adjustment constraint Wherein, The lower limit of the inlet guide vane opening adjustment at the time k, The upper limit of the inlet guide vane opening adjustment at the time k, The inlet guide vane opening based on temperature control at the time k.

[0033] The second aspect of the present application provides a primary frequency modulation control system based on inlet guide vane adjustment of central air conditioner.

[0034] A primary frequency modulation control system based on inlet guide vane adjustment of central air conditioner, comprising:

[0035] The response control module is configured to generate a frequency response signal within the range corresponding to the standby capacity, superimpose the temperature control signal, control the inlet guide vane opening, and make the central air conditioner power change participate in the primary frequency modulation of the power system.

[0036] The third aspect of the present application provides a computer readable storage medium, which stores a program, and the program is executed by a processor to realize the steps in the primary frequency modulation control method based on inlet guide vane adjustment of central air conditioner.

[0037] The fourth aspect of the present application provides an electronic device, comprising a memory, a processor and a program stored in the memory and executable on the processor, wherein the processor executes the program to realize the steps in the primary frequency modulation control method based on inlet guide vane adjustment of central air conditioner.

[0038] Compared with the prior art, the beneficial effects of the present application are:

[0039] 1、The present application innovatively proposes a primary frequency modulation control strategy based on inlet guide vane adjustment of central air conditioner, identifies the central air conditioner control system parameters and delay time, and can provide more accurate prediction for the central air conditioner power change; considers the safety and rapid response of the equipment, considers the maximum change rate constraint and opening constraint of the inlet guide vane control in the frequency response process, ensures the safety and feasibility of the central air conditioner participating in the frequency regulation, adopts a decentralized control strategy, automatically responds to the frequency signal, and ensures the rapidity of the response.

[0040] 2. The application innovatively proposes a primary frequency modulation control strategy based on the import guide vane adjustment of a central air conditioner, considers user comfort and load rebound, utilizes the heat storage effect of chilled water and rooms, and the primary frequency modulation is aimed at power fluctuation with fast frequency and small amplitude, has little effect on indoor temperature, uses a local temperature control loop signal as a baseline signal, considers the change of refrigeration demand in the frequency modulation process, considers the feedback effect of the temperature signal in real time, and avoids the air conditioner power rebound caused by the temperature far away from the set point after the control ends.

[0041] Advantages of additional aspects of the application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0042] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application and its description serve to explain the application, and do not constitute an improper limitation of the application.

[0043] Figure 1 A principle schematic diagram of a central air conditioner chilled water machine temperature control system provided for the embodiment 1 of the application is shown in the figure;

[0044] Figure 2 A chilled water outlet temperature and return water temperature comparison diagram of a certain day provided for the embodiment 1 of the application is shown in the figure;

[0045] Figure 3 A chilled water machine measured power and predicted power comparison diagram of a certain day provided for the embodiment 1 of the application is shown in the figure;

[0046] Figure 4 A chilled water outlet temperature and return water temperature comparison diagram of a certain day provided for the embodiment 1 of the application is shown in the figure;

[0047] Figure 5 A chilled water machine measured power and predicted power comparison diagram of a certain day provided for the embodiment 1 of the application is shown in the figure;

[0048] Figure 6 A central air conditioner thermoelectric model diagram provided for the embodiment 1 of the application is shown in the figure;

[0049] Figure 7 A compressor model diagram provided for the embodiment 1 of the application is shown in the figure;

[0050] Figure 8 A central air conditioner chilled water machine aggregate power and standby capacity schematic diagram provided for the embodiment 1 of the application is shown in the figure;

[0051] Figure 9 A central air conditioner based on import guide vane adjustment primary frequency modulation control diagram provided for the embodiment 1 of the application is shown in the figure;

[0052] Figure 10The central air conditioner power demand change schematic diagram provided for the embodiment 1 of the present application;

[0053] Figure 11 The modified four-machine two-area example system wiring diagram provided for the embodiment 1 of the present application;

[0054] Figure 12 The system frequency change curve caused by the direct current blocking fault under different central air conditioner backup levels provided for the embodiment 1 of the present application;

[0055] Figure 13 The long time domain load fluctuation diagram provided for the embodiment 1 of the present application;

[0056] Figure 14 The long time domain frequency fluctuation comparison diagram provided for the embodiment 1 of the present application;

[0057] Figure 15 The long time domain central air conditioner indoor temperature change comparison diagram provided for the embodiment 1 of the present application. DETAILED DESCRIPTION

[0058] The present application will be further described below in conjunction with the drawings and embodiments.

[0059] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains.

[0060] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0061] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0062] Embodiment 1:

[0063] The embodiment 1 of the present application provides a primary frequency modulation control method based on central air conditioner inlet guide vane adjustment, including the following processes:

[0064] S1: Establish a local control system model, construct a parameter identification optimization problem, and identify the control system parameters using a PSO algorithm.

[0065] S1.1: Establish a local control system model

[0066] The cooling capacity of a chiller can be continuously adjusted to maintain the chilled water outlet and return temperatures at the set temperature. Simultaneously, the chiller's power changes, and the cooling capacity Q increases accordingly. ch and power P ch The relationship can be fitted using a cubic polynomial:

[0067]

[0068] Where c0, c1, c2, and c3 are the fitting coefficients of the cubic polynomial, and the maximum cooling capacity Q is... ch,max The rated performance coefficient k of the air cooler can be used. COP and maximum power P ch,max Represented as:

[0069] Q ch,max =k COP ·P ch,max (2)

[0070] Central air conditioning control systems primarily employ PI controllers. Referring to air conditioning product manuals, chillers also utilize the rate of change in return water temperature to predict changes in cooling capacity. This establishes PID control for the return water temperature and a PI control system for the outlet water temperature. The control loop needs to consider time delays, requiring the establishment of a time delay component. The control system, for example... Figure 1 As shown.

[0071] in, These are the PID parameters for the return water temperature. and These are the PID parameters for the outlet water temperature, and these parameters form a set K. PID T d It refers to the delay time and the return water temperature. and outlet water temperature Each with the set value By comparing the results, errors e1 and e2 are obtained, and then input into the PID controller to calculate the control signal u.

[0072] S1.2: Constructing a parameter identification optimization problem

[0073] In a control system, six parameters need to be identified: PID parameters and T. d Using the least squares method, the predicted data P calculated by the control model is... ch,p and measurement data P ch,m To minimize the deviation, the parameter identification problem can be transformed into the following optimization problem:

[0074]

[0075] The constraints are:

[0076]

[0077]

[0078]

[0079]

[0080] u(k)=u1(k)+u2(k) (8)

[0081]

[0082]

[0083]

[0084] K PID ≥0 (12)

[0085] Where k is the kth sampling time, the sampling period is Δk, the constraint conditions (4)-(8) show the measurement data and As input, the PID controller outputs the calculation process of the control signal u(k), the constraint condition (9) is the discrete form of the delay link;

[0086] In order to ensure that the sampling time before the delay time Is an integer, the constraint condition (11) is added, The control signal u from time to k time is also calculated by (4)-(8). The constraint condition (10) calculates the predicted data P ch,p (k), the constraint condition (12) ensures that the PID parameter has physical meaning, the predicted data P ch,p (k) is compared with the measured data P ch,m (k), the deviation at k time is obtained, the objective function (3) is composed of the square of the deviation, and the optimization goal is to find a set of decision variables K PID And T d Make the objective function minimum.

[0087] S1.3: Identify PID parameters and delay time based on PSO algorithm:

[0088] Define T d And K PID As the dimension of the particle, and the objective function as the fitness function. The PSO algorithm is used to solve the optimization problem, and the control system parameters are identified.

[0089] Combined with experimental data, the parameter identification method of the application is used to obtain the central air conditioning chiller control system parameter identification result, as shown in Table 1.

[0090] Table 1: Parameter identification result

[0091]

[0092] Integral link coefficient Compared with the proportional differential link coefficient, it is very small, because from the air conditioning start, the integral link is always accumulating temperature error, and the chilled water temperature will reach the set value in tens of minutes after starting. The proportional coefficient of outlet water temperature Approaches to 0, because the outlet water temperature is closely related to the refrigeration capacity, if the refrigeration capacity changes, the outlet water temperature will change quickly. Therefore, the proportional coefficient of the outlet water temperature feedback control refrigeration capacity is set to be small, which can avoid the oscillation of control and enhance the stability of the control system. At the same time, the change trend of return water temperature is close to that of outlet water temperature, and the change of return water temperature means the change of indoor temperature. The use of differential proportional control of return water temperature can achieve the rapidity of control.

[0093] As Figure 2 shown, the chilled water temperature on the day of parameter identification is shown, the temperature and parameters are brought into the control system to obtain the power prediction value, Figure 3 The comparison chart of the power measured value can be seen that the prediction data is almost consistent with the measured data, and the root mean square error is 6.34 kW, which is 1.40% of the rated power. The results verify the effectiveness of the parameters and the model. The data of another day, August 30, 2018, is used for further verification, Figure 4 The temperature chart is shown in Figure 5 The power comparison chart can be seen that the prediction data has high consistency with the measured data, and the root mean square error is 11.90 kW, which is 2.63% of the rated power. These results verify the effectiveness of the parameter identification method proposed in the present application.

[0094] S2: Establish a central air conditioning heat and power model to quantitatively evaluate the central air conditioning primary frequency modulation standby capacity based on inlet guide vane adjustment.

[0095] S2.1: Central air conditioning heat and power model

[0096] When the inlet guide vane is controlled to participate in primary frequency modulation, the power of the chiller fluctuates rapidly, and has almost no effect on the power of the remaining equipment. The power change of the central air conditioning can be represented by the power change of the chiller. The power P ch of the chiller is related to the opening O IGV of the inlet guide vane, which is expressed by the following formula:

[0097] P ch =f(O IGV )=(a0+a1·O IGV +a2·O IGV 2 )·P ch,max (13)

[0098] where a0, a1, a2 are coefficients of quadratic polynomial, fitted by real-time operation data of water chiller, P ch,max is the maximum power of water chiller.

[0099] The central air conditioning thermal-electric model is established, as shown in Figure 6 , and the compressor model is as shown in Figure 7 , wherein the maximum opening rate R u and R d of guide vane opening, the upper and lower limit constraints O IGV,max and O IGV,min of opening, the power constraint P ch,max , T v is the time constant in the model.

[0100] S2.2: Quantitative evaluation of primary frequency regulation reserve capacity of central air conditioning load

[0101] Suppose that there are N central air conditioners in a region, and the up-regulation frequency reserve capacity of the i-th air conditioner at time k is which can be expressed as:

[0102]

[0103] wherein, is the guide vane opening of the i-th air conditioner at time k. According to the requirement of primary frequency regulation reserve, all the air conditioners need to be activated within ΔT r , if the guide vane opening is reduced at the maximum rate, the guide vane opening after ΔT r is expressed as formula (15), which is the lower limit of guide vane opening at time k

[0104]

[0105] Similarly, the down-regulation frequency reserve capacity and the upper limit of guide vane opening are expressed as:

[0106]

[0107]

[0108] The reserve capacity of central air conditioners in M regions is aggregated by using the partition aggregation method, and the total up-regulation and down-regulation reserve capacities are expressed as:

[0109]

[0110]

[0111] wherein, and The first i air conditioner in the j district of the primary frequency modulation up and down standby capacity.

[0112] As Figure 8 shown, for some place about 2 / 3 of the centrifugal central air conditioning 710 sets of meteorological zoning aggregation results, baseline for the power of the chiller, the distance from the baseline to the dotted line represents the central air conditioning primary frequency modulation up and down standby capacity.

[0113] S3: design based on the import guide vane adjustment of central air conditioning primary frequency modulation control strategy.

[0114] In order to avoid communication delay, a kind of decentralized control strategy is adopted, taking an air conditioner as an example, the frequency response signal is superimposed into the local temperature control signal as the offset, and the import guide vane is controlled, as Figure 9 shown.

[0115] The local temperature control signal, the chilled water temperature T ch as input, the controller generates, for the baseline control signal, the frequency response signal, generated by the frequency response controller monitoring the system frequency, as the offset of the baseline signal.

[0116] The frequency response controller first judges whether the system frequency is in the action dead zone [f Dmin , f Dmax ], if it is in the range, the controller does not issue frequency response signal, if the frequency exceeds the range, the frequency response signal is issued.

[0117] Specifically, taking the time when the frequency exceeds the range as the starting time k of each frequency modulation, the frequency response signal is issued according to formula (20), and ΔO IGV satisfies the adjustment constraint

[0118]

[0119] In the superimposed control of frequency response signal and temperature control signal, the maximum opening rate R u and R d of guide vane and the opening constraint O IGV,max and O IGV,min should be considered. The baseline control signal at time k, under the action of superimposed control, the power consumption curve of central air conditioning will be corrected, as Figure 10 shown.

[0120] Figure 11 ​The modified four-machine two-area example system shown is simulated, the high voltage direct current transmission line of bus 8 can be considered as a constant power source, the input power is 120 MW, the reference value of power is 900 MW, the loads of bus 7 and 9 are 1520 MW and 1100 MW respectively, it is assumed that they all contain 710 central air conditioners, accounting for 21.6%, 29.9% of the total load power of each, and the power of the water chiller is about 70% of the power of the central air conditioner, the capacity of the generator G1-G4 is 625 MW, and the central air conditioner model parameters are obtained from the identification results of experimental data.

[0121] It is assumed that at t=5s, HVDC at node 8 occurs DC blocking fault, if the fault occurs at different time of day, the primary backup of central air conditioner is different, in order to reflect the difference of frequency response results, in Figure 8 , several time instants with different backup capacities such as 9:00, 10:00, 11:00 and 12:00 are selected as initial time instants.

[0122] Figure 12 It is shown that if the central air conditioner load does not participate in primary frequency regulation, under a larger disturbance, the system frequency drops greatly and the steady-state value cannot recover to the requirement of 49.8 Hz of the power system; and the central air conditioner participates in the primary frequency regulation of the power system with the decentralized control strategy designed in the application, can quickly respond to the frequency deviation, and under different backup capacities, has a good improvement on the frequency quality. See Table 2, for backup capacity of central air conditioner load at different time instants and minimum and steady-state values of frequency after fault occurs. The central air conditioner participating in the primary frequency regulation with the control method of the application has an improvement on the minimum frequency and the steady-state value, can make the system frequency recover to the requirement of 49.8 Hz or above, and the greater the backup capacity, the better the improvement effect on the frequency quality.

[0123] Table 2: Backup capacity and frequency value when fault occurs at different time instants

[0124]

[0125] In order to verify the effect of the control strategy on inhibiting load rebound and considering user comfort, two control methods are compared to deal with the long-time domain load fluctuation starting at 15:00, during the long-time domain load fluctuation, the secondary frequency regulation of the generator is considered.

[0126] Method 1: the central air conditioner is only controlled by the frequency response signal without the temperature signal;

[0127] Method 2: the central air conditioner is controlled by the control strategy of the application;

[0128] After 90 minutes, the central air conditioner stops responding to the frequency signal and is only controlled by the temperature signal. In order to compare the room temperature change representing user comfort, the normal operation process of the central air conditioner not participating in frequency response is also simulated.

[0129] In Figure 13 , the total load fluctuation (except for central air conditioning) is shown, Figure 14 for comparison of average frequency variation. The quality of control is measured by the standard deviation of frequency σ, Table 3 lists the frequency values and rebound load, considering the local temperature control signal in the control process can greatly avoid the load rebound after the end of control, 1.9MW of rebound load is very small for 900MW of reference power, from Figure 14 it can be seen that there is almost no impact on frequency after the end of control. Without considering the local temperature control signal, it will cause a rebound load of 75.4MW, which also causes the frequency to drop again after the end of control. The control strategy of the present application can improve the quality of frequency and suppress the load rebound.

[0130] Table 3: Frequency and load rebound under different methods

[0131]

[0132] Figure 15 for indoor temperature, it can be seen that the control strategy of the present application can make the indoor temperature almost consistent with the indoor temperature without participating in frequency modulation, which is the effect of considering the local temperature control signal in the frequency modulation process. These results can verify that the control strategy of the present application has the effect of suppressing load rebound and considering user comfort.

[0133] Embodiment 2:

[0134] The embodiment 2 of the present application provides a primary frequency modulation control system based on central air conditioner inlet guide vane adjustment, comprising:

[0135] The response control module is configured to generate a frequency response signal within the range corresponding to the standby capacity, superimposed with the temperature control signal, to control the opening of the inlet guide vane, so that the central air conditioner power changes to participate in the primary frequency modulation of the power system.

[0136] The working method of the system is the same as the primary frequency modulation control method based on central air conditioner inlet guide vane adjustment provided in embodiment 1, which will not be repeated here.

[0137] Embodiment 3:

[0138] The embodiment 3 of the present application provides a computer readable storage medium, which stores a program, and the program is executed by a processor to realize the steps in the primary frequency modulation control method based on central air conditioner inlet guide vane adjustment as described in embodiment 1 of the present application.

[0139] Embodiment 4:

[0140] Embodiment 4 of the present application provides an electronic device, comprising a memory, a processor, and a program stored in the memory and capable of running on the processor, wherein the processor implements the steps in the primary frequency modulation control method based on central air conditioner inlet guide vane adjustment according to the embodiment 1 of the present application when executing the program.

[0141] The above merely provides preferred embodiments of the present application but not for limiting the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A primary frequency modulation control method based on central air conditioner inlet guide vane adjustment, characterized in that, The method comprises the following processes: In a range corresponding to the standby capacity, a frequency response signal is generated and superimposed with a temperature control signal to control the inlet guide vane opening degree, so that the central air conditioning power changes to participate in the primary frequency modulation of the power system; The frequency response signal is superimposed into the local temperature control signal as a deviation to control the inlet guide vane; Local temperature control signal, from chilled water temperature T ch As input, controller generated, for baseline control signal, frequency response signal, from monitoring system frequency, frequency response controller generated, for baseline signal offset After the parameter identification process of the central air conditioning control system, before the frequency response signal is superimposed with the temperature control signal, a process of determining the range of the primary frequency modulation standby capacity of the central air conditioning based on the inlet guide vane adjustment in the to-be-modulated region is further included, comprising: The range of the primary frequency modulation standby capacity of the central air conditioning based on the inlet guide vane adjustment in the to-be-modulated region comprises: The i Central air conditioning in k The up-regulation of spare capacity at the moment is: ; The first i The central air conditioner in k The down-regulation frequency standby capacity at the moment is: ; wherein, is the first i is the second k is the wicket opening of the central air conditioner at the time, is the first i is the lower limit of the wicket opening of the central air conditioner, is the first i is the upper limit of the wicket opening of the central air conditioner, f（·） is a function of the power of the chiller and the wicket opening; No. i The lower and upper limits of the guide vane opening for a central air conditioning unit are as follows: wherein, is the maximum opening rate of the guide vane opening at opening, is the maximum opening rate of the guide vane opening at closing, is the full activation time of the required primary frequency regulation reserve, is the minimum value of the guide vane opening, is the maximum value of the guide vane opening.

2. The primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to claim 1, wherein, Before the frequency response signal is superimposed with the temperature control signal, a process of performing parameter identification on the central air conditioning control system is further included, comprising: The PID parameters of the return water temperature, the PID parameters of the outlet water temperature, and the delay time are identified.

3. The primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to claim 2, wherein, The parameter identification result of the central air conditioning control system is obtained by taking the minimum deviation of the central air conditioning chiller power prediction value and the measured value as the target.

4. The primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to claim 1, wherein, The standby capacity of the central air conditioning in the to-be-modulated region is aggregated according to a partition aggregation method to obtain the total up-regulation standby capacity and the down-regulation standby capacity.

5. The primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to claim 1, wherein, The function of the power of the chiller and the guide vane opening degree is: wherein , , is a coefficient of a quadratic polynomial, is a vane opening, is a maximum power of the chiller.

6. The primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to claim 1, wherein, It is judged whether the current frequency of the central air conditioning control system is in the action dead zone range, if yes, no frequency response signal of the inlet guide vane is sent out, and if no, a frequency response signal of the inlet guide vane is generated, and the frequency response signal is: wherein, is a unit regulation coefficient, f is a current frequency of the central air conditioning control system, f Dmin is a lower limit of the action dead zone range, f Dmax is an upper limit of the action dead zone range; the moment of the start of each frequency modulation is outside the range of frequencies k during each frequency modulation, satisfying the regulation constraint wherein, is k the lower limit of the regulation of the inlet guide vane opening at the moment is k the upper limit of the regulation of the inlet guide vane opening at the moment is k the inlet guide vane opening based on the temperature control at the moment 7. A primary frequency modulation control system based on central air conditioning inlet guide vane adjustment, using the control method according to any one of claims 1-6, characterized in that, It comprises: The response control module is configured to generate a frequency response signal in a range corresponding to the standby capacity, superimpose the frequency response signal with a temperature control signal, control the inlet guide vane opening degree, and make the central air conditioning power change to participate in the primary frequency modulation of the power system.

8. A computer-readable storage medium having stored thereon a program, characterized in that, The program is executed by the processor to implement the steps in the primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to any one of claims 1-6.

9. An electronic device comprising a memory, a processor, and a program stored in the memory and executable on the processor, characterized by The processor executes the program to implement the steps in the primary frequency modulation control method based on the inlet guide vane adjustment of the central air conditioning according to any one of claims 1-6.

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