CN105572468A - Electric-automobile and power-grid interacted bi-directional metering method - Google Patents

Abstract

The invention discloses an electric-automobile and power-grid interacted bi-directional metering method. The method mainly comprises a direct-current electric-energy bidirectional metering and charging. E expresses an increased electric quantity. Ep expresses a positive initial electric quantity. En expresses a reverse initial electric quantity. Ec expresses an energy remainder during a charging process. Ed expresses an energy remainder during a discharging process. CT expresses a positive increase threshold value. And DT expresses a reverse increase threshold value. By using the electric-automobile and power-grid interacted bi-directional metering method in the invention, electric energy metering can be performed for an automobile participating in an electric-automobile and power-grid interaction; problems that electric energy metering and electricity charge calculating are not accurate when an electric-automobile user participates in the electric-automobile and power-grid interaction, and real-time performance is not high are solved; and enthusiasm for the user to participate in the electric-automobile and power-grid interaction is increased. Simultaneously, electric quantity data of the electric automobile under an electric-automobile and power-grid interaction mode is accurately calculated and analysis data is provided for the electric-automobile and power-grid interaction.

Description

A kind of electric automobile and the interactive bidirectional measuring method of electrical network

Technical field

The present invention relates to a kind of electric automobile and the interactive bidirectional measuring method of electrical network, belong to electric automobile and electrical network interaction technique field.

Background technology

Under electric automobile and electrical network interactive model, electric automobile to the anti-power transmission of electrical network, can participate in the scheduling of electrical network.Electric automobile mainly carries out intercommunication by charge-discharge machine (comprising vehicle-mounted and non-vehicle-mounted) and electrical network.Metering between DC charging motor and electric automobile adopts DC measurement, DC intelligent electric energy meter is installed, charging process is measured, and metrical information is passed to charging set and electricity consumption acquisition terminal, for the display of backstage charging system-computed, storage and charging pile man-machine interface.

GB/T28569-2012 " electric vehicle alternating-current charging pile electric energy metrical " obtains State Administration for Quality Supervision and Inspection and Quarantine, the approval of national standardization management committee is issued and implements." electric vehicle alternating-current charging pile electric energy metrical " standard covers the configuration installation requirement of the technical requirement of electric vehicle alternating-current charging pile electric energy metrical and electric power meter, test method and inspection rule.The enforcement of this standard will provide standard support for electrically-charging equipment commercial operation, for the design of specification alternating-current charging pile and charge metering electric power meter, production and examination provide technical basis, promote development and the application of electric automobile and electrically-charging equipment industry.But above-mentioned standard does not refer in detail to the content of direct current bidirectional measuring.Therefore the metering continuing to go deep into direct current energy is needed

Summary of the invention

Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of electric automobile and the interactive bidirectional measuring method of electrical network.

Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:

A kind of electric automobile and electrical network interactive electric energy bidirectional measuring method, mainly comprise bidirectional measuring and the charging of direct current energy.E represents the electricity of increase, and Ep represents forward initial quantity of electricity, and En represents reverse initial quantity of electricity, and Ec represents the energy remainder of charging process, and Ed represents the energy remainder of discharge process, and CT represents threshold values that forward increases, DT represents the threshold values oppositely increased.

Step one: after system initialization, accepts by CAN communication module the parameters that higher level issues; Comprise: the mode of charging, current electricity prices, threshold parameter CT and DT, calibration system time, calibration forward initial quantity of electricity and reverse initial quantity of electricity are set.

Step 2: read in measuring apparatus the current forward initial quantity of electricity and reverse initial quantity of electricity that store, then read the data and address that store in register corresponding to voltage, electric current, and convert data to system decimal computation numerical value.

The size computing method of step 3: E are as follows: in formula: u (t), i (t) are respectively battery total voltage and the working current in time t moment second, and W is the energy that in the time, battery absorbs or consumes, unit K Wh; Direction according to threshold parameter and energy flow is accumulated respectively, realizes the accurate-metering being filled with and consuming electric energy to car load;

$W=\frac{1}{3.6\×{10}^6}\∫u\left(t\right)\·i\left(t\right)\mathrm{\Δ}t$

Store in a register after calculating the W in the cycle, system reads the value of W and is converted to E from register.

Step 4: the electricity increment E read is judged, as E > 0, charge capacity Ec adds up E; As E < 0, discharge electricity amount Ed adds up | E|; After cumulative electricity Ec and Ed exceedes threshold values CT and DT of setting, upgrade Ec and Ed, and the value of Ec and Ed is assigned to initial quantity of electricity Ep and En; If cumulative electricity Ec and Ed does not exceed threshold values CT and DT of setting, then return step 3 and again measure.

Step 5: after Ec and Ed after renewal stores, the charge mode that system is arranged according to higher level, inquiry current electricity prices, the electricity price then according to current system input is multiplied with current electricity, calculates the electricity charge of newly-increased electricity in the memory cycle.

Step 6: the electricity after storage and the electricity charge send the event memory of electricity and charging by CAN communication module superior system based on DL/T645-2007 communication protocol.

Preferably, charging way can select time-shared charge and ladder charging two kinds of modes.

Beneficial effect: a kind of electric automobile provided by the invention and the interactive bidirectional measuring method of electrical network, the method can carry out electric energy metrical for the vehicle participating in electric automobile and electrical network interaction, solution electric automobile user participates in electric energy metrical and the electricity charge in electric automobile and electrical network interaction and calculates inaccurate and that real-time is not high problem, improves the enthusiasm that electricity consumption participates in electric automobile and electrical network interaction.Accurate statistics has been carried out, for electric automobile and electrical network interaction provide analysis data to the electric quantity data of electric automobile under electric automobile and electrical network interactive model simultaneously.

Accompanying drawing explanation

Fig. 1 is system flowchart of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further described.

As shown in Figure 1, a kind of electric automobile and electrical network interactive electric energy bidirectional measuring method, mainly comprise bidirectional measuring and the charging of direct current energy.E represents the electricity of increase, and Ep represents forward initial quantity of electricity, and En represents reverse initial quantity of electricity, and Ec represents the energy remainder of charging process, and Ed represents the energy remainder of discharge process, and CT represents threshold values that forward increases, DT represents the threshold values oppositely increased.

Step one: after system initialization, accepts by CAN communication module the parameters that higher level issues; Comprise: the mode of charging is set, charging way can select time-shared charge and ladder charging two kinds of modes, current electricity prices, threshold parameter CT and DT, calibration system time, calibration forward initial quantity of electricity and reverse initial quantity of electricity.

Step 2: read in measuring apparatus the current forward initial quantity of electricity and reverse initial quantity of electricity that store, then read the data and address that store in register corresponding to voltage, electric current, and convert data to system decimal computation numerical value.

The size computing method of step 3: E are as follows: in formula: u (t), i (t) are respectively battery total voltage and the working current in time t moment second, and W is the energy that in the time, battery absorbs or consumes, unit K Wh; Direction according to threshold parameter and energy flow is accumulated respectively, realizes the accurate-metering being filled with and consuming electric energy to car load;

$W=\frac{1}{3.6\&times;{10}^6}\&Integral;u\left(t\right)\&CenterDot;i\left(t\right)\mathrm{\&Delta;}t$

Store in a register after calculating the W in the cycle, system reads the value of W and is converted to E from register.

Step 4: the electricity increment E read is judged, as E > 0, charge capacity Ec adds up E; As E < 0, discharge electricity amount Ed adds up | E|; After cumulative electricity Ec and Ed exceedes threshold values CT and DT of setting, upgrade Ec and Ed, and the value of Ec and Ed is assigned to initial quantity of electricity Ep and En; If cumulative electricity Ec and Ed does not exceed threshold values CT and DT of setting, then return step 3 and again measure.

Step 5: after Ec and Ed after renewal stores, the charge mode that system is arranged according to higher level, inquiry current electricity prices, the electricity price then according to current system input is multiplied with current electricity, calculates the electricity charge of newly-increased electricity in the memory cycle.

Step 6: the electricity after storage and the electricity charge send the event memory of electricity and charging by CAN communication module superior system based on DL/T645-2007 communication protocol.

The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (2)

1. electric automobile and the interactive bidirectional measuring method of electrical network, is characterized in that: comprise step as follows:

Step one: after system initialization, accepts by CAN communication module the parameters that higher level issues; Comprise: the mode of charging, current electricity prices, threshold parameter CT and DT, calibration system time, calibration forward initial quantity of electricity and reverse initial quantity of electricity are set;

Step 2: read in measuring apparatus the current forward initial quantity of electricity and reverse initial quantity of electricity that store, then read the data and address that store in register corresponding to voltage, electric current, and convert data to system decimal computation numerical value;

The size computing method of step 3: E are as follows: in formula: u (t), i (t) are respectively battery total voltage and the working current in time t moment second, and W is the energy that in the time, battery absorbs or consumes, unit K Wh; Direction according to threshold parameter and energy flow is accumulated respectively, realizes the accurate-metering being filled with and consuming electric energy to car load;

$W=\frac{1}{3.6\&times;{10}^6}\&Integral;u\left(t\right)\&CenterDot;i\left(t\right)\mathrm{\&Delta;}t$

Store in a register after calculating the W in the cycle, system reads the value of W and is converted to E from register;

Step 4: the electricity increment E read is judged, as E > 0, charge capacity Ec adds up E; As E < 0, discharge electricity amount Ed adds up | E|; After cumulative electricity Ec and Ed exceedes threshold values CT and DT of setting, upgrade Ec and Ed, and the value of Ec and Ed is assigned to initial quantity of electricity Ep and En; If cumulative electricity Ec and Ed does not exceed threshold values CT and DT of setting, then return step 3 and again measure;

Step 5: after Ec and Ed after renewal stores, the charge mode that system is arranged according to higher level, inquiry current electricity prices, the electricity price then according to current system input is multiplied with current electricity, calculates the electricity charge of newly-increased electricity in the memory cycle;

Step 6: the electricity after storage and the electricity charge send the event memory of electricity and charging by CAN communication module superior system based on DL/T645-2007 communication protocol.

2. a kind of electric automobile according to claim 1 and the interactive bidirectional measuring method of electrical network, is characterized in that: described charging way comprises time-shared charge and ladder charging two kinds of modes.