CN113391104A - Dual-mode and direct access type direct current electric energy meter and electric energy metering method - Google Patents
Dual-mode and direct access type direct current electric energy meter and electric energy metering method Download PDFInfo
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- CN113391104A CN113391104A CN202110582324.0A CN202110582324A CN113391104A CN 113391104 A CN113391104 A CN 113391104A CN 202110582324 A CN202110582324 A CN 202110582324A CN 113391104 A CN113391104 A CN 113391104A
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Abstract
The invention discloses a dual-mode and direct access type direct current electric energy meter and an electric energy metering method, and belongs to the field of electric energy metering. This electric energy meter: connecting a double-path voltage sampling module with the positive direct current bus, the negative direct current bus and the return line, and collecting positive voltage V +, negative voltage V-and positive and negative voltage VDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module; connecting a double-path current sampling module with an anode direct-current bus and a cathode direct-current bus, collecting anode bus current I + and cathode bus current I-, and outputting the collected anode bus current I + and cathode bus current I-as current digital signals to a metering module; the metering module receives the voltage digital signal and the current digital signal, respectively meters the positive electric energy, the negative electric energy and the total electric energy according to the voltage digital signal and the current digital signal, and outputsAnd (6) metering data. The invention can be configured to measure the electric energy on a bipolar power grid and a pseudo-bipolar power grid.
Description
Technical Field
The present invention relates to the field of electric energy metering, and more particularly, to a dual-mode and direct access type dc electric energy meter, and an electric energy metering method.
Background
With the rapid development of economic society and technical equipment, new energy elements such as distributed generation, energy storage and electric vehicles are increasingly connected into a power distribution network, a novel source-network-load-storage interaction energy supply mode is continuously developed, flexible direct current power distribution, alternating current and direct current hybrid power distribution and the like become important development directions of the future power distribution network, and are complementary with the traditional alternating current power distribution to realize interconnection and intercommunication of alternating current and direct current power grids.
The rapid development of the direct-current power distribution network creates more application environments for direct-current electric energy metering. The connection modes of the direct-current power distribution network include asymmetrical single-stage connection, double-stage connection (true bipolar) and symmetrical single-stage connection (false bipolar). For the double-stage wiring form, each pole can be operated independently, so that the electric energy meter installed on the double-stage line needs to input 2 paths of voltage and 2 paths of current respectively, and measures the electric energy and the total electric energy on 2 power transmission lines respectively, and for the single-stage wiring form, the electric energy meter can input 1 path of voltage and current to calculate the electric energy.
The direct current electric energy meter that uses at present mainly installs in the load side, if be arranged in direct current charging pile, the electric energy meter can only input 1 way voltage and 1 way electric current, and generally adopts indirect access formula direct current electric energy meter, adopts indirect access formula direct current electric energy meter to increase the error link, has brought a great deal of inconvenience for the measurement management, has also reduced the degree of accuracy of measurement. The voltage grade of the low-voltage side of the direct-current distribution network is mostly 750V (+/-375V), the current is lower than 500A, and the direct-access electric energy meter is more convenient by adopting a direct-access electric energy meter without a mutual inductor or a shunt.
Disclosure of Invention
The invention aims to realize the electric energy metering in the wiring form of a direct current distribution network with bipolar wiring and pseudo-bipolar wiring by switching the metering modes, and provides a dual-mode and direct access type direct current electric energy meter, which comprises:
the double-circuit voltage sampling module is connected with the positive direct-current bus, the negative direct-current bus and the return line to collect the centering property of the positive direct-current busPositive voltage V + of point, negative voltage V-of negative DC bus to neutral point and positive and negative voltages V of positive bus to negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
the double-path current sampling module is connected with the positive direct current bus and the negative direct current bus, acquires positive bus current I + and negative bus current I-, and outputs acquired positive bus current I + and negative bus current I-converted current digital signals to the metering module;
and the metering module receives the voltage digital signal and the current digital signal, meters the total electric energy according to the voltage digital signal and the current digital signal, and outputs an electric energy pulse signal and metering original data to the outside.
Optionally, the two-way voltage sampling module includes 1 resistance voltage division sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor acquires a positive voltage V + of the positive direct current bus to the neutral point, a negative voltage V-of the negative bus to the neutral point and a voltage V between the positive bus and the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
Optionally, the two-way current sampling module includes 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
Optionally, the metering module meters the electric energy of each bus and the total electric energy, and can be set to use a bipolar metering mode or a pseudo-bipolar metering mode;
optionally, the bipolar metering mode calculates effective values and average values of the positive electrode voltage and the positive electrode bus current, positive electrode power P + and positive electrode electric energy W + according to the positive electrode bus current I + and the positive electrode voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
the positive pole electric energy W + and the negative pole electric energy W-are summed to calculate the total electric energy WDCAccording to the total electric energy WDCOutputting electric energy pulses;
optionally, in the pseudo-bipolar metering mode, the negative bus current I-is used for comparative monitoring of the positive bus current I +, and the positive and negative voltages V are used according to the positive bus current I +, the positive bus current I + and the negative bus current VDCCalculating the effective value and average value of the positive and negative electrode voltages and the positive bus current, and the total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and the total power PDCAnd total electric energy WDC；
And outputting the electric energy pulse according to the total electric energy WDC.
Optionally, the electric energy meter further includes:
the management module is used for managing the electric energy meter;
the management comprises the following steps: communication management, display management, data storage management, clock management, key operation management, electric energy storage management and event recording;
the communication interface module is used for metering data communication and meter setting, and comprises a bipolar metering mode or a pseudo-bipolar metering mode of the metering module;
the display and key module is used for switching a bipolar metering mode or a pseudo-bipolar metering mode of the metering module and displaying metering data and ammeter parameters;
the storage unit is used for storing the metering data;
the power supply module is used for supplying power to the electric energy meter;
a battery module for powering the clock module;
the clock module is used for displaying the time of the electric energy meter;
and the pulse output module is used for outputting the electric energy pulse of the electric energy meter.
The invention also provides a method for metering electric energy, which comprises the following steps:
connecting the two-way voltage sampling module with the positive direct-current bus, the negative direct-current bus and the return line, and acquiring a positive voltage V + of the positive direct-current bus to the neutral point, a negative voltage V-of the negative direct-current bus to the neutral point and positive and negative voltages V of the positive bus to the negative bus by using the two-way voltage sampling moduleDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
connecting a double-path current sampling module with a positive direct current bus and a negative direct current bus, collecting a positive bus current I + and a negative bus current I-by using the double-path current sampling module, converting the collected positive bus current I + and the collected negative bus current I-into current digital signals and outputting the current digital signals to a metering module;
and the metering module is used for receiving the voltage digital signal and the current digital signal, metering the total electric energy according to the voltage digital signal and the current digital signal, and outputting an electric energy pulse signal and metering original data to the outside. .
Optionally, the two-way voltage sampling module includes 1 resistance voltage division sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor acquires a positive voltage V + of the positive direct current bus to the neutral point, a negative voltage V-of the negative bus to the neutral point and a voltage V between the positive bus and the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
Optionally, the two-way current sampling module includes 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
Optionally, the metering module meters the electric energy of each bus and the total electric energy, and can be set to use a bipolar metering mode or a pseudo-bipolar metering mode;
optionally, the bipolar metering mode calculates effective values and average values of the positive electrode voltage and the positive electrode bus current, positive electrode power P + and positive electrode electric energy W + according to the positive electrode bus current I + and the positive electrode voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
summing the positive pole electric energy W + and the negative pole electric energy W-, calculating total electric energy WDC, and calculating the total electric energy according to the total electric energy WDCOutputting electric energy pulses;
optionally, in the pseudo-bipolar metering mode, the negative bus current I-is used as the comparative monitoring of the positive bus current I +, and the effective values and average values of the positive and negative bus voltages and the positive bus current are calculated according to the positive bus current I +, the positive and negative voltages VDC, and the total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and the total power PDCAnd total electric energy WDC；
And outputting the electric energy pulse according to the total electric energy WDC.
The invention can respectively measure the positive electric energy, the negative electric energy and the total electric energy by setting a measuring mode under a bipolar measuring mode, does not influence the electric energy measurement when one pole fails, and can measure the total electric energy and monitor the current of the positive pole and the negative pole under a pseudo-bipolar measuring mode.
Drawings
Fig. 1 is a system structure diagram of a dual-mode and direct access type dc electric energy meter according to the present invention;
FIG. 2 is a schematic diagram of a dual path voltage sampling module of the present invention;
FIG. 3 is a schematic diagram of a dual current sampling module of the present invention;
FIG. 4 is a schematic view of a bipolar metering wiring of the present invention;
FIG. 5 is a schematic view of a pseudo-bipolar metrology wiring of the present invention;
FIG. 6 is a flow chart of a method for metering electric energy according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The present invention provides a dual-mode and direct access type dc electric energy meter 200, as shown in fig. 1, including:
the double-circuit voltage sampling module is connected with the positive direct-current bus, the negative direct-current bus and the return line, and is used for collecting the positive voltage V + of the positive direct-current bus to the neutral point, the negative voltage V-of the negative direct-current bus to the neutral point and the positive voltage V-of the positive bus to the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
the double-path current sampling module is connected with the positive direct current bus and the negative direct current bus, acquires positive bus current I + and negative bus current I-, converts the acquired positive bus current I + and negative bus current I-into current digital signals and outputs the current digital signals to the metering module;
and the metering module receives the voltage digital signal and the current digital signal, meters the total electric energy according to the voltage digital signal and the current digital signal, and outputs an electric energy pulse signal and metering original data to the outside.
The electric energy meter further comprises:
the management module is used for managing the electric energy meter;
the management comprises the following steps: communication management, display management, data storage management, clock management, key operation management, electric energy storage management and event recording;
the communication interface module is used for metering data communication and meter setting, and comprises a bipolar metering mode or a pseudo-bipolar metering mode of the metering module;
the display and key module is used for switching a bipolar metering mode or a pseudo-bipolar metering mode of the metering module and displaying metering data and ammeter parameters;
the storage unit is used for storing the metering data;
the power supply module is used for supplying power to the electric energy meter;
a battery module for powering the clock module;
the clock module is used for displaying the time of the electric energy meter;
and the pulse output module is used for outputting the electric energy pulse of the electric energy meter.
The two-way voltage sampling module comprises 1 resistance voltage division sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor acquires a positive voltage V + of the positive direct current bus to the neutral point, a negative voltage V-of the negative bus to the neutral point and a voltage V between the positive bus and the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
The two-path current sampling module comprises 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
The metering module meters the electric energy of each bus and the total electric energy, and can be set to use a bipolar metering mode or a pseudo-bipolar metering mode;
the double-pole metering mode calculates effective values and average values of the positive pole voltage and the positive pole bus current, positive pole power P + and positive pole electric energy W + according to the positive pole bus current I + and the positive pole voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
the positive pole electric energy W + and the negative pole electric energy W-are summed to calculate the total electric energy WDCAccording to the total electric energy WDCOutputting electric energy pulses;
in the pseudo-bipolar metering mode, the negative bus current I-is used as the comparative monitoring of the positive bus current I +, and the positive and negative voltages V are used according to the positive bus current I +, the positive and negative voltagesDCCalculating the effective value and average value of the positive and negative electrode voltages and the positive bus current, and the total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and the total power PDCAnd total electric energy WDC；
According to the total electric energy WDCAnd outputting the electric energy pulse.
The two-way voltage sampling module, as shown in fig. 2, includes 1 resistance voltage-dividing sensor and 24-bit ADC chip, and collects positive voltage V + (positive bus-to-neutral voltage), negative voltage V- (negative bus-to-neutral voltage), and positive and negative voltage VDC (positive bus-to-negative bus voltage) by using a middle-stage differential sampling mode.
The two-way current sampling module, as shown in fig. 3, includes 2 current sensors and 24-bit ADC chips, and the current sensors may be a shunt, a zero flux transformer, and a TMR sensor, and when the shunt is adopted, the output of the shunt needs to be connected to an isolation amplifier to eliminate the influence of high common mode voltage. When the zero-flux transformer and the TMR sensor are adopted, an isolation amplifier is not required to be connected, and the two-way current sampling module can simultaneously acquire the current I + of the positive bus and the current I-of the negative bus. The metering module 3 completes the direct current electric energy metering function, comprises 2 electric energy metering methods of bipolar metering and pseudo-bipolar metering, and provides electric energy and pulse output signals and metering original data to the outside.
The two metering modes involved in the invention are as follows:
a ± 375V bipolar metering mode, wiring as shown in fig. 4: the electric energy meter is characterized in that the electric energy meter metering mode is set to be a two-stage metering mode through a key or a communication interface, the electric energy meter voltage sampling module is respectively connected with the positive electrode direct current bus, the negative electrode direct current bus and a return line and is respectively connected into U +, U-and PE voltage input terminals of the electric energy meter, a resistance voltage division voltage sensor is adopted to respectively collect voltage V + between the positive electrode and a neutral point and voltage V-between the negative electrode and the neutral point, a +/-375V high-voltage analog signal is converted into a small-voltage signal to be input into an ADC chip, and then a voltage digital signal is output to the metering chip.
The current sampling module of the electric energy meter is respectively connected with a positive direct current bus and a negative direct current bus, and a positive current sensor wiring terminal I1+ and I2+ serially connected to positive DC bus to collect the current I + from positive bus and negative current sensor terminal I1-and I2-connecting in series a negative dc bus, collecting the negative bus current I-.
When the current sensor is a shunt, the small voltage signal measured by the shunt is output to the isolation amplifier and then output to the ADC chip, and the ADC chip outputs the current digital signal to the metering chip.
When the current sensor is a TMR or zero magnetic flux sensor, a small voltage signal output by the TMR or zero magnetic flux sensor is output to the ADC chip, and the ADC chip outputs a current digital signal to the metering chip.
The metering chip calculates the effective value and the average value of the voltage of the anode, the effective value and the average value of the current of the anode, the power P + of the anode and the electric energy W + of the anode according to the V + and the I +; calculating the effective value and the average value of the negative voltage, the effective value and the average value of the negative current, the negative power P-and the negative electric energy W-according to the V-and the I-respectively; adding the positive pole electric energy W + and the negative pole electric energy W-to obtain total electric energy WDC。
The metering chip is based on the total DC power WDCAnd controlling the pulse output module to output electric energy pulses. And the metering chip transmits the data to the management module for display.
The +/-375V pseudo-bipolar metering mode is characterized in that the connection is shown in figure 5, the metering mode of the electric energy meter is set to be a single-stage metering mode through a key or a communication interface, the voltage sampling module of the electric energy meter is respectively connected with the positive direct-current bus and the negative direct-current bus and respectively connected to the U + and U-voltage input terminals of the electric energy meter, and the voltage V between the positive electrode (+375V) and the negative electrode (-375V) of the system is acquired by adopting a resistance voltage dividing modeDCAnd converting the high-voltage analog signal into a small-voltage signal to be input into the ADC chip, and then outputting the voltage digital signal to the metering chip.
The current sampling module of the electric energy meter is respectively connected with a positive direct current bus and a negative direct current bus, and a positive current sensor wiring terminal I1+ and I2+ serially connected to positive DC bus to collect the current I + from positive bus and negative current sensor terminal I1-and I2-connecting in series a negative dc bus, collecting the negative bus current I-. Because the current of the positive bus is equal to that of the negative bus, the metering chip can select the current of the positive bus or the negative bus to calculate the electric energy value. The metering chip is according to VDCI + calculating effective value and average value of positive and negative electrode voltages, effective value and average value of positive electrode current, and DC power PDCD.c. electric energy WDC(ii) a And calculating the effective value and the average value of the negative electrode current according to the I & lt- & gt as comparison and monitoring with the positive electrode current. Or the metering chip is according to VDCI-calculating effective values and average values of the voltages of the positive electrode and the negative electrode, the effective values and the average values of the currents of the negative electrode and the direct current power PDCD.c. electric energy WDC(ii) a Calculating the effective value and average value of the anode current according to the I +The value is compared and monitored with the negative electrode current.
If the current sensor is a current divider, the small voltage signal measured by the current divider is firstly output to the isolation amplifier and then output to the ADC chip, and the ADC chip outputs the current digital signal to the metering chip. When the current sensor is a TMR or zero magnetic flux sensor, a small voltage signal output by the TMR or zero magnetic flux sensor is output to the ADC chip, and the ADC chip outputs a current digital signal to the metering chip.
The metering chip is based on the total DC power WDCAnd controlling the pulse output module to output electric energy pulses.
And the metering chip transmits the data to the management module for display.
The present invention also provides a method for measuring electric energy, as shown in fig. 6, including:
connecting the two-way voltage sampling module with the positive direct-current bus, the negative direct-current bus and the return line, and acquiring a positive voltage V + of the positive direct-current bus to the neutral point, a negative voltage V-of the negative direct-current bus to the neutral point and positive and negative voltages V of the positive bus to the negative bus by using the two-way voltage sampling moduleDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
connecting a double-path current sampling module with a positive direct current bus and a negative direct current bus, collecting a positive bus current I + and a negative bus current I-by using the double-path current sampling module, and outputting the collected positive bus current I + and the collected negative bus current I-as current digital signals to a metering module;
and the metering module is used for receiving the voltage digital signal and the current digital signal, metering the total electric energy according to the voltage digital signal and the current digital signal, and outputting an electric energy pulse signal and metering original data to the outside.
The two-way voltage sampling module comprises 1 resistance voltage division sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor acquires positive voltage V + of the positive direct current bus to the neutral point, negative voltage V-of the negative bus to the neutral point, and positive and negative voltagesVoltage V between busesDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
The two-path current sampling module comprises 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
The metering module meters the electric energy of each bus and the total electric energy, and can be set to use a bipolar metering mode or a pseudo-bipolar metering mode;
the double-pole metering mode calculates effective values and average values of the positive pole voltage and the positive pole bus current, positive pole power P + and positive pole electric energy W + according to the positive pole bus current I + and the positive pole voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
the positive pole electric energy W + and the negative pole electric energy W-are summed to calculate the total electric energy WDCAccording to the total electric energy WDCOutputting electric energy pulses;
in the pseudo-bipolar metering mode, the negative bus current I-is used as the comparative monitoring of the positive bus current I +, and the positive and negative voltages V are used according to the positive bus current I +, the positive and negative voltagesDCCalculating the effective value and average value of the positive and negative electrode voltages and the positive bus current, and the total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and the total power PDCAnd total electric energy WDC；
According to the total electric energy WDCAnd outputting the electric energy pulse.
The invention can respectively measure the positive electric energy, the negative electric energy and the total electric energy by setting a measuring mode under a bipolar measuring mode, does not influence the electric energy measurement when one pole fails, and can measure the total electric energy and monitor the current of the positive pole and the negative pole under a pseudo-bipolar measuring mode.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A dual mode and direct access dc power meter, the power meter comprising:
the double-circuit voltage sampling module is connected with the positive direct-current bus, the negative direct-current bus and the return line, and is used for collecting the positive voltage V + of the positive direct-current bus to the neutral point, the negative voltage V-of the negative direct-current bus to the neutral point and the positive voltage V-of the positive bus to the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
the double-path current sampling module is connected with the positive direct current bus and the negative direct current bus, acquires positive bus current I + and negative bus current I-, converts the acquired positive bus current I + and negative bus current I-into current digital signals and outputs the current digital signals to the metering module;
and the metering module receives the voltage digital signal and the current digital signal, meters the total electric energy according to the voltage digital signal and the current digital signal, and outputs an electric energy pulse signal and metering original data to the outside.
2. The electric energy meter according to claim 1, wherein the two-way voltage sampling module comprises 1 resistance voltage division sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor acquires a positive voltage V + of the positive direct current bus to the neutral point, a negative voltage V-of the negative bus to the neutral point and a voltage V between the positive bus and the negative busDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
3. The electric energy meter of claim 1, the two-way current sampling module comprising 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
4. The electric energy meter according to claim 1, wherein the metering module meters each bus bar electric energy and the total electric energy, and can be set to use a bipolar metering mode or a pseudo-bipolar metering mode;
the bipolar metering mode calculates effective values and average values of the positive electrode voltage and the positive electrode bus current, positive electrode power P + and positive electrode electric energy W + according to the positive electrode bus current I + and the positive electrode voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
the positive pole electric energy W + and the negative pole electric energy W-are summed to calculate the total electric energy WDCAccording to the total electric energy WDCOutputting electric energy pulses;
the pseudo-bipolar metering mode takes negative bus current I-as comparative monitoring of positive bus current I +, and according to positive bus current I +, positive and negative voltages VDCCalculatingEffective value and average value of positive and negative electrode voltage and positive electrode bus current, total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and calculating the power PDCAnd total electric energy WDC；
According to the total electric energy WDCAnd outputting the electric energy pulse.
5. The electrical energy meter of claim 1, further comprising:
the management module is used for managing the electric energy meter;
the management comprises the following steps: communication management, display management, data storage management, clock management, key operation management, electric energy storage management and event recording;
the communication interface module is used for metering data communication and meter setting, and comprises a bipolar metering mode or a pseudo-bipolar metering mode of the metering module;
the display and key module is used for switching a bipolar metering mode or a pseudo-bipolar metering mode of the metering module and displaying metering data and ammeter parameters;
the storage unit is used for storing the metering data;
the power supply module is used for supplying power to the electric energy meter;
a battery module for powering the clock module;
the clock module is used for displaying the time of the electric energy meter;
and the pulse output module is used for outputting the electric energy pulse of the electric energy meter.
6. A method of metering electrical energy using an electrical energy meter according to any of claims 1 to 5, the method comprising:
connecting the two-way voltage sampling module with the positive direct-current bus, the negative direct-current bus and the return line, and acquiring a positive voltage V + of the positive direct-current bus to the neutral point, a negative voltage V-of the negative direct-current bus to the neutral point and positive and negative voltages V of the positive bus to the negative bus by using the two-way voltage sampling moduleDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal and outputting the voltage digital signal to a metering module;
connecting a double-path current sampling module with a positive direct current bus and a negative direct current bus, collecting a positive bus current I + and a negative bus current I-by using the double-path current sampling module, and outputting the collected positive bus current I + and the collected negative bus current I-as current digital signals to a metering module;
and the metering module is used for receiving the voltage digital signal and the current digital signal, metering the total electric energy according to the voltage digital signal and the current digital signal, and outputting an electric energy pulse signal and metering original data to the outside.
7. The method of claim 6, the two-way voltage sampling module comprising 1 resistive divider sensor and 1 24-bit ADC chip;
the resistance voltage dividing sensor collects the positive voltage V + of the positive direct current bus to the neutral point, the negative voltage V-of the negative bus to the neutral point and the positive and negative voltages V between the positive and negative busesDCThe positive voltage V +, the negative voltage V-, and the positive and negative voltages VDCConverting the voltage into a voltage digital signal;
the 24-bit ADC chip transmits the voltage digital signal to the metering module.
8. The method of claim 6, the two-way current sampling module comprising 2 current sensors and 1 24-bit ADC chip;
the current sensor is a shunt, a zero flux transformer or a TMR sensor, and if the current sensor is the shunt, the isolation amplifier is connected.
9. The method of claim 6, wherein the metering module meters each bus bar power and the total power, and is configurable to use a bipolar metering mode or a pseudo-bipolar metering mode;
the bipolar metering mode calculates effective values and average values of the positive electrode voltage and the positive electrode bus current, positive electrode power P + and positive electrode electric energy W + according to the positive electrode bus current I + and the positive electrode voltage V +;
calculating effective values and average values of the negative electrode voltage and the negative electrode bus current, negative electrode power P-and negative electrode electric energy W-according to the negative electrode bus current I-, the negative electrode voltage V-;
the positive pole electric energy W + and the negative pole electric energy W-are summed to calculate the total electric energy WDCAccording to the total electric energy WDCOutputting electric energy pulses;
the pseudo-bipolar metering mode takes negative bus current I-as comparative monitoring of positive bus current I +, and according to positive bus current I +, positive and negative voltages VDCCalculating the effective value and average value of the positive and negative electrode voltages and the positive bus current, and the total power PDCAnd total electric energy WDC；
Or, the positive bus current I + is used as the comparative monitoring of the negative bus current I-, and the positive and negative voltages V are determined according to the negative bus current I-DCCalculating the effective value and average value of the voltage of the positive electrode and the negative electrode and the current of the negative electrode bus, and the total power PDCAnd total electric energy WDC；
According to the total electric energy WDCAnd outputting the electric energy pulse.
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