WO2021189711A1 - Procédé de commande pour réduire la valeur de capacité d'un condensateur d'un dispositif de charge pour véhicule électrique à énergie nouvelle - Google Patents

Procédé de commande pour réduire la valeur de capacité d'un condensateur d'un dispositif de charge pour véhicule électrique à énergie nouvelle Download PDF

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WO2021189711A1
WO2021189711A1 PCT/CN2020/101128 CN2020101128W WO2021189711A1 WO 2021189711 A1 WO2021189711 A1 WO 2021189711A1 CN 2020101128 W CN2020101128 W CN 2020101128W WO 2021189711 A1 WO2021189711 A1 WO 2021189711A1
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Prior art keywords
capacitor
charging
charging current
crip
power
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PCT/CN2020/101128
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English (en)
Chinese (zh)
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刘钧
冯颖盈
姚顺
徐金柱
胡飞
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深圳威迈斯新能源股份有限公司
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Publication of WO2021189711A1 publication Critical patent/WO2021189711A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the invention relates to the technical field of new energy electric vehicle charging, in particular to a control method for reducing the capacitance value of a new energy electric vehicle charging device.
  • the charging equipment of the prior art includes a PFC converter inside, which causes the input power to contain a pulsating component of 2 times the frequency.
  • a pulsating component of 2 times the frequency is stored in the capacitor on the DC side of the PFC.
  • a large capacitance and large volume capacitor is required.
  • a typical 6.6kW vehicle-mounted charger requires a capacitor of about 2000uF, and the volume of the capacitor accounts for about 10% of the volume of the entire charger board.
  • high-frequency, high-density charging equipment has become the focus of various OEMs and parts.
  • the advantage is to reduce its own capacitance value and reduce the cost, and increase the power density of the charging equipment without reducing it.
  • the service life of the battery is feasible to reduce the capacitance value of charging equipment and the use of pulse charging technology, and on the basis of the original control, the advantage is to reduce its own capacitance value and reduce the cost, and increase the power density of the charging equipment without reducing it. The service life of the battery.
  • the object of the present invention is to provide a control method for reducing the capacitance value of the charging device, so as to solve the problems raised in the background art.
  • the present invention provides a control method for reducing the capacitance of a charging device, which includes the following steps:
  • Step 1 Calculate the relationship expression between the capacitance value of the capacitor and the charging current according to the relationship between the input and output power and the pulsating power on the capacitor and the voltage;
  • Step 2 Give the constraint conditions of the charging current and the peak value of the capacitor ripple
  • Step 3 According to the relationship between the capacitance value of the capacitor and the charging current, the minimum value of the capacitance value is calculated under the constraints of the charging current and the peak value of the capacitor pulsation.
  • the real-time power input and output are the real-time power input and output.
  • u ac and i ac are the input voltage and current respectively, their effective values are V ac and I ac respectively , ⁇ is the fundamental frequency, i b is the battery charging current, Ib is the average current, and ibrip is the pulsation of the charging current Component, Vb is the DC voltage of the battery, and P2 is the power consumed by the second load; ignoring the loss of the line and switch tube, the following expression can be derived based on the power balance
  • pcrip(t) is the pulsating power on the capacitor (the average value is zero)
  • uc(t0) is the initial value of the capacitor voltage
  • Vdc is the average value of the voltage on the capacitor (uc(t))
  • ucrip(t) is The pulsating voltage
  • icrip(t) is the current on the capacitor
  • C is the capacitance value
  • step two includes:
  • the peak value of u crip (t) is limited, the capacitance of the capacitor will be relatively large; therefore, it is necessary to change the charging method of the battery to transfer the pulsating power on the capacitor, and ensure that the charging current is always greater than zero;
  • p crip (t) when p crip (t) is greater than zero, it must satisfy the formula (7) are satisfied, there is a half cycle of the fundamental wave which The average is zero and the waveform is symmetrical; that is, when p crip (t) is greater than zero, as long as the above requirements are met, there are no other restrictions on the waveform.
  • step three
  • the waveform of the charging current is controlled to track the reference signal, so as to adjust the power absorbed by the battery, and indirectly adjust the pulsating power on the capacitor p crip (t); p crip (t)
  • the waveform directly determines the capacitance of the capacitor; the reference signal of the charging current indirectly determines the capacitance and volume of the capacitor;
  • the waveform of p crip (t) is realized by adjusting the charging current; when p crip (t)>0, its waveform satisfies the constraint condition of formula (7), and its average is zero in half of the fundamental wave period.
  • the charging strategy can also be set freely under the corresponding constraint conditions such that p crip (t) satisfies its constraint conditions.
  • the control method for reducing the capacitance value of the new energy electric vehicle charging equipment provided by the present invention transfers the pulsating power on the capacitor by changing the charging method of the battery, which can significantly reduce the capacitance value and volume of the capacitor, and at the same time increase the power density of the charging equipment .
  • Figure 1 (a), (b) is a flow chart of a control method for reducing the capacitance of a charging device according to the present invention
  • Figure 2 (a), (b) and (c) are structural block diagrams of the on-board charger of the present invention.
  • Figure 3 is a waveform diagram of the input power and output power of the charger
  • Figure 4 shows the waveform of the voltage on the DC side capacitor of the PFC
  • Figure 5 is a structural block diagram and control strategy of the on-board charger
  • Figure 6 is a waveform diagram of p lim (t);
  • Figure 7 is an example waveform diagram of p crip (t).
  • Fig. 8 is an example waveform diagram of i b (t);
  • Figure 9 is a block diagram of the reference signal of the charging current
  • Figure 10 is a waveform diagram of the reference signal
  • Figure 11 is a waveform diagram of the charging current
  • Figure 12 is a waveform diagram of the current flowing through the capacitor
  • Fig. 13 is an example waveform diagram of p crip (t) derived according to formula (14);
  • Figure 14 is a waveform diagram of the charging current i b (t) in a fundamental period
  • Figure 15 is a block diagram of a control strategy for reducing the capacitance of an on-board charger
  • FIG. 16 is a waveform diagram of the reference signal i bref (t) of the charging current when the output load of the second path changes suddenly;
  • Figure 17 is a waveform diagram of the charging current i b (t) when the second output load changes suddenly;
  • Fig. 18 is an example waveform diagram of p crip (t) derived according to formula (16);
  • Fig. 19 is an example waveform diagram of p crip (t) derived according to formula (17);
  • Fig. 20 is an example waveform diagram of p crip (t) derived according to formula (25);
  • Figure 21 is a waveform diagram of i brip (t) corresponding to formula (23);
  • Fig. 22 is a waveform diagram of i brip (t) corresponding to formula (24);
  • Figure 23 is a waveform diagram of i brip (t) corresponding to formula (26);
  • Fig. 24 is a waveform diagram of i b (t) corresponding to formula (20);
  • Fig. 25 is a waveform diagram of i b (t) corresponding to formula (21);
  • Fig. 26 is a waveform diagram of i b (t) corresponding to formula (27).
  • Figure 1 shows the control strategy to reduce the capacitance value and volume of the capacitor, including the following steps: use equations to describe the relationship between input and output power and the pulsating power and voltage on the capacitor; according to the equations, the capacitance value and charging of the capacitor are obtained.
  • FIG. 2 shows the circuit structure of a conventional charging device.
  • the circuit structure consists of two conversion modules, PFC (AC/DC) and DC/DC.
  • the input of the PFC is connected to the grid, and the output of the DC/DC conversion circuit is connected to the battery. It is connected in parallel with the output terminal of PFC and the input terminal of DC/DC.
  • the DC/DC conversion circuit includes two outputs, the first output is connected to a high-voltage battery, and the second output is connected to a low-voltage battery.
  • the networked charging process one way is to charge the high-voltage battery, and the other way can supply power to the low-voltage battery (connected to the second output load (less than 2kW)).
  • Capacitors can store energy and can absorb the input pulsating power, and its capacitance and volume are closely related to the absorbed pulsating power.
  • the relationship between the power absorbed by the capacitor and the power absorbed by the battery can be derived, and the capacitance value of the PFC DC side capacitor can also be determined.
  • the real-time power of input and output are respectively
  • u ac and i ac are the input voltage and current respectively, their effective values are V ac and I ac respectively , ⁇ is the fundamental frequency, i b is the battery charging current, Ib is the average current, and ibrip is the pulsation of the charging current Component, Vb is the voltage (DC) of the battery, and P2 is the power consumed by the second load. Ignoring the loss of the line and the switch tube, the following expression can be derived according to the power balance
  • ucrip(t) is the pulsating power on the capacitor (the average value is zero)
  • uc(t0) is the initial value of the capacitor voltage
  • Vdc is the average value of the voltage on the capacitor (uc(t))
  • ucrip(t) is The pulsating voltage
  • icrip(t) is the current on the capacitor
  • C is the capacitance value.
  • the voltage on the DC side capacitor is 400V, assuming that the maximum voltage ripple on the capacitor is 40V (ucrip(t) peak-to-peak value).
  • the power absorbed by the battery is active power, and the input pulsating power will be stored on the capacitor on the DC side of the PFC, resulting in a pulsating component in the voltage on the capacitor.
  • the value range of the capacitor can be calculated, and the smallest capacitance value is 1313uF.
  • the waveform of the input and output power of the charger is shown in Figure 3, and the voltage waveform on the capacitor is shown in Figure 4.
  • the sinusoidal charging method can transfer the pulsating power on the capacitor, thereby reducing the capacitance and volume of the capacitor.
  • the judgment standard of power battery cycle life is: when the capacity decays to 80% of the initial value, complete cycle test>1000 times, or when the capacity decays to 90% of the initial value, complete cycle test >500 times.
  • Formula (3) can be used to calculate the specific gravity A of the discharge and the charge in a half fundamental cycle or the specific gravity A of the discharge and the charge in a complete cycle.
  • Figure 5 shows the control block diagram of the entire on-board charger and proposes a charging strategy that minimizes the capacitance of the capacitor.
  • the basic idea of the control strategy proposed in Figure 5 is to transfer the pulsating power on the capacitor by changing the charging method of the battery, and to ensure that the charging current is always greater than zero.
  • the relationship between the capacitance value of the capacitor and the charging current can be calculated by formula (2)
  • the minimum capacitance value of the capacitor is only related to the waveform when p crip (t) is less than zero.
  • p crip (t) when p crip (t) is greater than zero, it must meet the condition of formula (7), and the average is zero in half of the fundamental wave period and the waveform is symmetrical. That is to say, when p crip (t) is greater than zero, as long as the above requirements are met, there are no other restrictions on the waveform.
  • Figure 7 shows a waveform (solid line) of p crip (t) in a fundamental wave period and compares it with the waveform of p lim (t) (dashed line), but it is not limited to this waveform, and its expression is
  • the values of t 1 , t 2 , t 3 and t 4 can all be calculated by V ac , I ac and P 2.
  • Fig. 7 only shows an example waveform of p crip (t), but it is not limited to this kind of waveform.
  • the power P 2 consumed by the second output load in Figure 2(a) is less than or equal to 2kW.
  • the minimum capacitance value of the capacitor must be designed according to the maximum value of P 2, and then combined Formula (8) and (9) can calculate the smallest capacitance value
  • the calculation of the minimum capacitance value in formula (11) is for a specific application, for example, the input power and the power consumed by the second load are set.
  • the above analysis and derivation are not limited to a specific application. In the case of different levels of input power and output power, they are still suitable for calculating the minimum capacitance of the capacitor.
  • the waveform of p crip (t) is achieved by adjusting the charging current.
  • p crip (t)>0 its waveform can be set freely under certain constraints (satisfying formula (7), and its average is zero in half of the fundamental wave period and the waveform is symmetrical). Therefore, the charging strategy can also be set freely under the corresponding constraint conditions (such that p crip (t) satisfies its constraint conditions).
  • the waveform of the charging current is controlled to track the reference signal, thereby achieving the purpose of adjusting the power absorbed by the battery, and indirectly adjusting the pulsating power p crip (t) on the capacitor. From formula (11), we can see that the waveform of p crip (t) directly determines the capacitance of the capacitor. Therefore, the reference signal of the charging current indirectly determines the capacitance and volume of the capacitor. For an example waveform of p crip (t) in FIG. 7, a corresponding charging strategy can be given (similarly, it is not limited to this charging strategy in practical applications).
  • Combining formula (2) and formula (10) can reverse the expression of the pulsating component i brip (t) of the charging current:
  • the waveform of i b (t) in formula (13) is shown in Figure 8. It is a signal with a period of 0.01s. The figure only shows the waveform within a fundamental period. The waveform shown in the figure corresponds to the waveform of p crip (t) in Figure 7, but is not limited to this kind of waveform.
  • the control algorithm in Fig. 5 can adopt formula (13) as shown in Fig. 9, wherein the reference signal of the charging current is obtained by formula (13), but it is not limited to this kind of reference signal. Make the difference between the reference signal and the feedback charging current, and then obtain the error signal, and then use the repetitive control (RC) to adjust the error signal to make the charging current track the reference signal.
  • a charging strategy provided in the figure can make the expression of the pulsating power p crip (t) on the capacitor as in formula (10).
  • Figure 12 shows the current i crip (t) flowing through the capacitor. Its value is proportional to the pulsating power absorbed by the capacitor (see formula (2)).
  • the waveform in Figure 12 is also similar to p crip (t) in Figure 7.
  • the waveform is similar.
  • the waveform of the voltage on the capacitor is shown in Figure 13, which shows that the peak value of its pulsation is about 20V, which satisfies the constraint condition (Equation (6)). Therefore, the minimum capacitance value calculated by the above theory is reasonable, and the charging control strategy provided in Figure 9 is also effective.
  • the value of t 14 can also be calculated according to a similar method, and the waveforms in these two intervals are as shown in formula (14) Shown.
  • the values of t 12 and t 13 and the waveform of p crip (t) during this period are not limited to those given by formula (14).
  • the waveform is subject to certain constraints (satisfying formula (7), and there is half The average of the fundamental wave period is zero and the waveform is symmetrical) can be set freely.
  • Figure 13 shows an example waveform of p crip (t) according to formula (14).
  • the values of t 11 , t 12 , t 13 and t 14 are the same as those in formula (14), and from formula (2), it can be seen that the waveform of i b (t) is determined by p crip (t), and also It is not limited to the expression given by formula (16).
  • Equation (16) shows that the minimum value of the charging current i b (t) changes with the power consumed by the second load (P 2 ). Even if P 2 is suddenly added, the charging current will not be pulled down to less than zero. Scope.
  • Figure 14 shows the waveform of the charging current i b (t) in a fundamental period.
  • the reference signal of the charging current in Fig. 5 can be obtained by formula (16), and Fig. 15 shows the corresponding charging strategy.
  • Equations (16) and (17) respectively give the other two expressions of p crip (t), and the waveforms are shown in Figure 18 and Figure 19.
  • p crip16 (t) and p crip17 (t) are the expressions of p crip (t) in formulas (16) and (17), respectively.
  • the control algorithm in the charging strategy in FIG. 5 can also adopt formula (18) or (19) to obtain the reference signal of the charging current.
  • the relationship between charging current i b (t) and p crip (t) is shown in formula (2), and the expression of p crip (t) can be set freely under certain constraints, as shown in formula (10) , (14), (16) and (17). Therefore, the charging current i b (t) is not limited to those shown in formulas (13), (16), (18) and (19), and the charging strategy in Figure 5 is also not limited to those provided in Figures 9 and 15 .
  • control strategy proposed by the present invention can significantly reduce the capacitance and volume of the capacitor, and in view of the sudden change of the second load, the proposed charging strategy can also ensure that the charging current is greater than Or equal to zero.
  • the minimum capacitance of DC charging method is 1313uF
  • Figure 2(b) is another common structural form of a vehicle-mounted charger.
  • the vehicle-mounted charger of this structure is a special form of Figure 2(a), and the capacitor can be eliminated under this structure.
  • Equation (27) gives an expression of i b (t), and its waveform is shown in Figure 26.
  • Figure 2(c) The vehicle-mounted charger of this structure can be transformed into Figure 2(a) by converting two low-voltage loads to one.
  • the capacitance of the capacitor of the invention is reduced by 83.8%. Therefore, on the one hand, the charging strategy provided by the present invention can significantly reduce the capacity and volume of the capacitor, thereby increasing the power density of the on-board charger; on the other hand, ensure that the charging current is greater than or equal to zero, and avoid the battery in every half of the fundamental cycle.
  • the phenomenon of charging and discharging can help improve the service life of the battery.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

Une politique de commande pour réduire une valeur de capacité d'un condensateur d'un dispositif de charge pour un véhicule électrique à énergie nouvelle. La politique consiste : étape I, en fonction d'une relation entre une puissance d'entrée et une puissance de sortie et une relation entre une puissance pulsée et une tension sur un condensateur, à réaliser un calcul pour obtenir une expression relationnelle entre une valeur de capacité du condensateur et un courant de charge ; étape II, à donner des conditions de contrainte au courant de charge et à la valeur de crête de pulsation du condensateur ; et étape III, en fonction de la relation entre la valeur de capacité du condensateur et le courant de charge, à calculer la valeur minimale de la valeur de capacité du condensateur dans les conditions de contrainte du courant de charge et la valeur de crête de pulsation du condensateur. Dans la politique de commande, la puissance pulsée sur le condensateur est transférée au moyen d'un changement de mode de charge d'une batterie, ce qui réduit significativement la valeur de capacité et le volume du condensateur et augmente également la densité de puissance d'un dispositif de charge pour un véhicule électrique à énergie nouvelle. De plus, la politique garantit que le courant de charge est constamment supérieur à zéro lorsqu'une charge basse tension à une extrémité de sortie est dynamique, prolongeant ainsi la durée de vie de la batterie.
PCT/CN2020/101128 2020-03-25 2020-07-09 Procédé de commande pour réduire la valeur de capacité d'un condensateur d'un dispositif de charge pour véhicule électrique à énergie nouvelle WO2021189711A1 (fr)

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CN106786485A (zh) * 2017-03-02 2017-05-31 华北电力大学（保定） 用于不平衡负载下直流微电网的电压脉动抑制方法
CN111371144A (zh) * 2020-03-25 2020-07-03 深圳威迈斯新能源股份有限公司 一种降低新能源电动汽车充电设备电容容值的控制方法

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