CN114290953A - Control system and control method of vehicle-mounted charger - Google Patents
Control system and control method of vehicle-mounted charger Download PDFInfo
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Abstract
The invention provides a control system and a control method of a vehicle-mounted charger, wherein the control system of the vehicle-mounted charger comprises the following steps: the system comprises an alternating current power grid, a vehicle-mounted charger, a power battery, a digital controller and a battery management system, wherein the alternating current power grid provides an alternating current power supply signal; the digital controller collects and processes alternating current power supply signals and direct current power supply signals converted by the vehicle-mounted charger; the battery management system sends a charging instruction to the vehicle-mounted charger according to the processing result; and the vehicle-mounted charger converts the input alternating current power supply signal into a direct current power supply signal according to the charging instruction so as to charge the power battery. According to the invention, the accuracy of identification and detection of the control system of the vehicle-mounted charger can be improved by arranging the digital controller, so that the use safety and the service life of the vehicle-mounted charger and the power battery are improved.
Description
Technical Field
The invention relates to the technical field of control of electric automobiles, in particular to a control system of a vehicle-mounted charger and a control method thereof.
Background
The Vehicle-mounted charger serves as a core component of the electric Vehicle, and plays a role in supplementing energy to the electric Vehicle, and meanwhile, signals such as voltage, current and the like of a power grid and a Battery need to be reported to a Battery Management System (BMS) and a Vehicle Control Unit (VCU), and the BMS and the VCU make corresponding charging Control and Vehicle Control decisions according to the signals.
With the diversification of alternating current charging and the increase of charging power, charging information required to be acquired by the BMS and the VCU is more and more, and the quality requirement on the information is higher and higher. However, the vehicle-mounted charger has defects in the high-voltage network signal processing of the power grid and the battery, and the acquisition of charging information by the BMS and the VCU is influenced. The vehicle-mounted charger has the following defects in the high-voltage network signal processing of a power grid and a battery:
(1) inaccurate identification of the power grid connection state and inaccurate identification of single-phase and three-phase power grids. For example, recognizing a grid side voltage with a dc bias as a grid disconnect, the BMS allows the electronic lock to be unlocked with a risk of electrocution. The electronic lock is connected with the BMS and used for preventing accidental disconnection in the charging process. For another example, if a single-phase grid is identified as a three-phase grid, the BMS will issue three-phase charging power and cause the charger to fail due to overload.
(2) The battery voltage and the battery alternating current ripple detection deviation are large during charging. As charging power increases, battery voltage and battery ac ripple increase, which affects battery life and performance, especially when grid quality is poor, the ripple will further deteriorate.
(3) The three-phase power grid state identification accuracy is low, for example, the phase sequence identification is wrong, and the three-phase power grid state identification can cause the failure of charging and even damage to a charger.
Disclosure of Invention
The invention aims to provide a control system of a vehicle-mounted charger and a control method thereof, so as to improve the accuracy of identification and detection of the control system of the vehicle-mounted charger.
In order to achieve the above and other related objects, the present invention provides a control system for a vehicle-mounted charger, comprising an ac power grid, the vehicle-mounted charger, a power battery, a digital controller and a battery management system, wherein,
the alternating current power grid provides alternating current power supply signals to the vehicle-mounted charger and the digital controller;
the digital controller is used for respectively carrying out real-time acquisition and processing on the alternating current power supply signal and the direct current power supply signal converted by the vehicle-mounted charger, transmitting a processing result to the battery management system, and carrying out drive control on the vehicle-mounted charger according to the processing result;
the battery management system sends a charging instruction to the vehicle-mounted charger according to the processing result;
and the vehicle-mounted charger converts the input alternating current power supply signal into the direct current power supply signal according to the charging instruction so as to charge the power battery.
Optionally, in the control system of the vehicle-mounted charger, the digital controller includes a high-compatibility signal processing module, a communication module, a control module, and a diagnosis module, wherein,
the high-compatibility signal processing module is used for respectively collecting and processing the alternating current power supply signal and the direct current power supply signal converted by the vehicle-mounted charger in real time, and transmitting the processing result to the communication module, the control module and the diagnosis module;
the communication module transmits the processing result to the battery management system;
the control module controls a switching tube according to the processing result so as to realize the driving control of the vehicle-mounted charger;
and the diagnosis module carries out fault diagnosis according to the processing result.
Optionally, in the control system of the vehicle-mounted charger, the ac power signal includes an ac voltage and an ac current; the dc power signal includes a battery voltage and a battery current.
Optionally, in the control system of the vehicle-mounted charger, the high-compatibility signal processing module includes a power grid connection identification module, a power grid type identification module, a power grid smart phase locking module, and a signal operation module, wherein,
the power grid connection identification module identifies whether the alternating current power grid is connected or not according to the collected alternating current power supply signal;
the power grid type identification module identifies the power grid type of the alternating current power grid when the power grid connection identification module identifies the connection of the alternating current power grid;
the power grid intelligent phase locking module autonomously selects an algorithm according to the power grid type identified by the power grid type identification module to acquire power grid frequency and power grid phase;
the signal operation module extracts the battery alternating current ripple, the battery direct current component, the effective values of the grid voltage and current, the grid voltage peak value and the charging efficiency in real time according to the grid frequency acquired by the grid intelligent phase-locking module.
Optionally, in the control system of the vehicle-mounted charger, the power grid types include a single-phase power grid and a three-phase power grid.
Optionally, in the control system of the vehicle-mounted charger, the circuit of the ac power grid includes a U-phase line, a V-phase line, a W-phase line, and an N-line, the ac voltage of the ac power signal includes a phase voltage UN, a phase voltage VN, and a phase voltage WN, and the line voltage includes a line voltage UV, a line voltage VW, and a line voltage WU.
Optionally, in the control system of the vehicle-mounted charger, the grid connection identification module includes a voltage amplitude identification module, a voltage polarity identification module, and a grid connection identification module, wherein,
the voltage amplitude identification module is used for carrying out amplitude judgment on the phase voltage and the line voltage of the collected alternating current power supply signal and transmitting an amplitude judgment result to the power grid connection identification module;
the voltage polarity identification module carries out polarity judgment on the phase voltage and the line voltage of the collected alternating current power supply signal and transmits a polarity judgment result to the power grid connection identification module;
and the power grid connection identification module judges whether the alternating current power grid is connected or not according to the amplitude judgment result and the polarity judgment result.
Optionally, in the control system of the vehicle-mounted charger, when the amplitude determination result is that the amplitudes of the phase voltage and the line voltage are continuously outside the threshold range, and/or when the polarity determination result is that the polarities of the phase voltage and the line voltage are continuously unchanged, the power grid connection identification module determines that the alternating current power grid is not connected; otherwise, the power grid connection identification module judges that the alternating current power grid is connected.
Optionally, in the control system of the vehicle-mounted charger, the power grid type identification module includes: a phase voltage rationality judgment module, a line voltage rationality judgment module and a power grid type identification module, wherein,
the phase voltage rationality judgment module judges the rationality of the phase voltage range of the collected alternating current power supply signal and transmits a phase voltage judgment result to the power grid type identification module;
the line voltage reasonability judgment module judges the reasonability of the line voltage range of the collected alternating current power supply signal and transmits a line voltage judgment result to the power grid type identification module;
and the power grid type identification module identifies the power grid type of the alternating current power grid when the phase voltage and the line voltage are both in a reasonable range.
Optionally, in the control system of the vehicle-mounted charger, when only one of the phase voltage UN, the phase voltage VN and the phase voltage WN has an input voltage, and a rectified voltage output by the vehicle-mounted charger conforms to characteristics of a single-phase power grid, the power grid type identification module identifies the single-phase power grid; when input voltages exist in the line voltage UV, the line voltage VW and the line voltage WU, and meanwhile, when the rectified voltage output by the vehicle-mounted charger meets the characteristics of a three-phase power grid, the power grid type identification module identifies the three-phase power grid.
Optionally, in the control system of the vehicle-mounted charger, when the line voltage rationality judgment module judges that the acquired line voltage UV, the line voltage VW and the line voltage WU of the alternating current power supply signal all have input voltage, the line voltage rationality judgment module judges the phase sequence of the three-phase power grid through a line voltage polarity combination mode.
Optionally, in the control system of the vehicle-mounted battery charger, the power grid smart phase-locking module includes: a virtual orthogonal module, a three-phase to orthogonal module, an output selection module and a software phase locking module, wherein,
the virtual orthogonal module converts the voltage of the single-phase power grid into corresponding two-phase static orthogonal voltage;
the three-phase to orthogonal module converts the voltage of a three-phase power grid into corresponding two-phase static orthogonal voltage;
the output selection module receives the power grid type identified by the power grid type identification module, selects one of the virtual orthogonal module and the three-phase to orthogonal module according to the power grid type, and transmits a selection result to the software phase locking module;
and the software phase locking module calculates according to the selection result to obtain the frequency and the phase of the power grid.
Optionally, in the control system of the vehicle-mounted battery charger, the signal operation module includes: an alternating current and direct current separation module, a root mean square extraction module, an alternating current peak extraction module and an efficiency calculation module, wherein,
the alternating current and direct current separation module separates alternating current components and direct current components in the collected direct current power supply signals to obtain battery alternating current ripples and battery direct current components;
the root-mean-square extraction module iteratively calculates effective values of the voltage and the current of the power grid in real time according to the frequency of the power grid;
the alternating current peak value extraction module calculates an alternating current sinusoidal distortion degree according to the effective values of the voltage and the current of the power grid and a rectification value output by the vehicle-mounted charger, and feeds the alternating current sinusoidal distortion degree back to peak value calculation to obtain a voltage peak value of the power grid;
and the efficiency calculation module calculates the charging efficiency according to the power grid voltage peak value and the battery direct-current component.
In order to achieve the above object and other related objects, the present invention further provides a control method of a vehicle-mounted charger, which uses the control system of the vehicle-mounted charger to control the vehicle-mounted charger, and is characterized by comprising the following steps:
the method comprises the steps that an alternating current power supply signal provided by an alternating current power grid and a direct current power supply signal converted by a vehicle-mounted charger are collected and processed in real time through a digital controller;
the battery management system receives the processing result of the digital controller and sends a charging instruction to the vehicle-mounted charger according to the processing result;
and the digital controller drives the vehicle-mounted charger according to the processing result, so that the vehicle-mounted charger converts an input alternating current power supply signal into a direct current power supply signal according to the charging instruction so as to charge a power battery.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the invention, the accuracy of identification and detection of the control system of the vehicle-mounted charger can be improved by arranging the digital controller, so that the use safety and the service life of the vehicle-mounted charger and the power battery are improved.
The invention is provided with the power grid connection identification module of the digital controller, and whether the power grid is connected or not can be accurately identified by combining the alternating voltage amplitude judgment and the line voltage polarity judgment; the invention is provided with a power grid type identification module of the digital controller, judges the rationality of phase voltage and line voltage, and secondarily confirms the type of the power grid by using rectified voltage, thereby ensuring that the identification of a single-phase power grid and a three-phase power grid is accurate, and improving the identification correctness of a phase sequence by a line voltage polarity combination mode; the invention is provided with the signal operation module of the digital controller, separates the direct current component and the alternating current component of the battery voltage and the battery current, and improves the accuracy of the detection of the battery voltage and the battery alternating current ripple content.
Drawings
Fig. 1 is a block diagram of a vehicle-mounted charger control system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a high compatibility signal processing module according to an embodiment of the present invention;
FIG. 3 is a block diagram of a grid connection identification module according to an embodiment of the invention;
FIG. 4 is a block diagram of a grid type identification module according to an embodiment of the invention;
FIG. 5 is a schematic illustration of the polarity of a three-phase cable according to an embodiment of the present invention;
FIG. 6 is a block diagram of a smart phase-locking module of the power grid according to an embodiment of the present invention;
FIG. 7 is a graph of three-phase stationary coordinates versus two-phase stationary coordinates according to an embodiment of the present invention;
FIG. 8 is an algorithmic block diagram of a software phase locking module according to an embodiment of the invention;
FIG. 9 is a block diagram of a signal computation module according to an embodiment of the present invention;
in the context of figures 1 to 9,
1-alternating current power grid, 2-vehicle charger, 3-power battery, 4-digital controller, 41-high compatibility signal processing module, 411-power grid connection identification module, 4111-voltage amplitude identification module, 4112-voltage polarity identification module, 4113-power grid connection identification module, 412-power grid type identification module, 4121-phase voltage rationality judgment module, 4122-line voltage rationality judgment module, 4123-power grid type identification module, 413-power grid intelligent phase locking module, 4131-virtual orthogonal module, 4132-three-phase to orthogonal module, 4133-output selection module, 4134-software phase locking module, 414-signal operation module, 4141-alternating current and direct current separation module, 4142-root mean square extraction module, 4143-alternating current peak value extraction module, 4144 efficiency calculation module, 42 communication module, 43 control module, 44 diagnostic module, 5 battery management system.
Detailed Description
The following describes the control system and the control method of the vehicle-mounted charger according to the present invention in further detail with reference to the accompanying drawings and the specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Fig. 1 shows a block diagram of a control system of the vehicle-mounted charger in the embodiment. The control system of the vehicle-mounted charger comprises an alternating current power grid 1, a vehicle-mounted charger 2, a power battery 3, a digital controller 4 and a Battery Management System (BMS) 5.
The alternating current power grid 1 provides an alternating current power supply signal to the vehicle-mounted charger 2 and the digital controller 4. The alternating current power signal comprises alternating voltage and alternating current, and the power grid types comprise a single-phase power grid and a three-phase power grid. The circuit of alternating current electric network 1 includes U looks line, V looks line, W looks line and N line, alternating current power supply signal's alternating voltage includes looks voltage and line voltage, just the looks voltage includes looks voltage UN, looks voltage VN and looks voltage WN, the line voltage includes line voltage UV, line voltage VW and line voltage WU.
The digital controller 4 respectively collects and processes the alternating current power supply signal and the direct current power supply signal converted by the vehicle-mounted charger 2 in real time, and transmits a processing result to the battery management system 5, and the digital controller 4 further performs drive control of the vehicle-mounted charger 2 according to the processing result. The control system of the vehicle-mounted charger further comprises a switch tube, and the digital controller 4 drives the switch tube to control the vehicle-mounted charger 2 according to the processing result.
And the battery management system 5 sends a charging instruction to the vehicle-mounted charger 2 according to the processing result. And the vehicle-mounted charger 2 converts the input alternating current power supply signal (namely, a high-voltage alternating current power supply HVAC) into the direct current power supply signal (namely, a high-voltage direct current power supply HVDC) according to the charging instruction so as to charge the power battery 3. The dc power signal includes a battery voltage and a battery current. And the vehicle-mounted charger 2 outputs a direct current power supply signal through a DCDC module port (comprising a DC + port and a DC-port) to charge the power battery 3.
With continued reference to fig. 1, the digital controller 4 mainly includes a high-compatibility signal processing module 41, a communication module 42, a control module 43, and a diagnostic module 44. The high-compatibility signal processing module 41 mainly collects high-voltage network signals, where the high-voltage network signals may include ac power signals and dc power signals, that is, the high-compatibility signal processing module 41 respectively collects the ac power signals and the dc power signals converted by the vehicle-mounted charger 2 in real time.
The high-compatibility signal processing module 41 further processes the collected ac power signal and dc power signal, and transmits the processing results to the communication module 42, the control module 43 and the diagnosis module 44, respectively.
Fig. 2 shows a block diagram of the high-compatibility signal processing module 41. The high-compatibility signal processing module 41 includes a power grid connection identification module 411, a power grid type identification module 412, a power grid smart phase locking module 413, and a signal operation module 414.
The grid connection identification module 411 identifies whether the ac power grid 1 is connected according to the collected ac power signal. Further, the grid connection identification module 411 mainly identifies whether the ac grid 1 is connected according to the ac voltage.
Referring to fig. 3, the grid connection identification module 411 may include a voltage magnitude identification module 4111, a voltage polarity identification module 4112, and a grid connection identification module 4113.
The voltage amplitude identification module 4111 performs amplitude judgment on the phase voltage and the line voltage of the collected alternating current power supply signal, and transmits an amplitude judgment result to the power grid connection identification module 4113. The amplitude judgment result is obtained by comparing the amplitudes of the phase voltage and the line voltage with a threshold value.
The voltage polarity identification module 4112 performs polarity judgment on the phase voltage and the line voltage of the collected ac power signal, and transmits a polarity judgment result to the power grid connection identification module 4113. The polarity judgment result is obtained mainly by judging the change condition of the voltage polarity.
The grid connection identification module 4113 determines whether the ac grid 1 is connected according to the amplitude determination result and the polarity determination result. When the amplitude judgment result is that the amplitudes of the phase voltage and the line voltage are continuously out of the threshold range and/or the polarity judgment result is that the polarities of the phase voltage and the line voltage are continuously unchanged, the power grid connection identification module 4113 judges that the alternating current power grid 1 is not connected; otherwise, the grid connection identification module 4113 determines that the ac grid 1 is connected. The threshold comprises a single-phase threshold and a three-phase threshold, the range of the single-phase threshold is preferably 75 Vrms-273 Vrms, and the range of the three-phase threshold is preferably 304 Vrms-472 Vrms. The condition that the phase voltage amplitude is out of the threshold range comprises the following conditions: the amplitude of the phase voltage is less than 75Vrms or more than 273 Vrms; the condition that the line voltage amplitude is out of the threshold range comprises the following conditions: the line voltage amplitude is less than 304Vrms or greater than 472 Vrms.
Compared with a traditional voltage amplitude identification mode, the voltage polarity judgment is added, the robustness of power grid connection identification can be enhanced, the situation that direct current bias exists is prevented from being identified as that the power grid is not connected, and the accuracy of identifying whether the power grid is connected or not can be improved.
Referring to fig. 4, the grid type identification module 412 identifies the grid type of the ac power grid 1 when the grid connection identification module 411 identifies that the ac power grid 1 is connected, that is, the grid type identification module 412 is configured to identify whether the ac power grid 1 is a single-phase power grid or a three-phase power grid, and its output will affect the subsequent module algorithm.
The grid type identification module 412 includes: a phase voltage rationality determination module 4121, a line voltage rationality determination module 4122, and a grid type identification module 4123.
The phase voltage rationality judgment module 4121 judges the rationality of the phase voltage range of the collected ac power signal, and transmits the phase voltage judgment result to the power grid type identification module 4123. That is, the phase voltage rationality determination module 4121 determines the range rationality of the phase voltage UN, the phase voltage VN, and the phase voltage WN.
The line voltage rationality judgment module 4122 judges the rationality of the line voltage range of the collected ac power signal, and transmits a line voltage judgment result to the power grid type identification module 4123. Namely, the line voltage rationality judgment module 4122 judges the rationality of the ranges of the line voltage UV, the line voltage VW, and the line voltage WU.
When the phase voltages and the line voltages are both within a reasonable range, the grid type identification module 4123 identifies the grid type of the ac grid 1. When only one of the phase voltage UN, the phase voltage VN and the phase voltage WN has an input voltage and the rectified voltage output by the vehicle-mounted charger 2 conforms to the characteristics of a single-phase power grid, the power grid type identification module 4123 identifies the single-phase power grid; when input voltages exist in the line voltage UV, the line voltage VW and the line voltage WU, and meanwhile, the rectified voltage output by the vehicle-mounted charger 2 meets the characteristics of a three-phase power grid, the power grid type identification module 4123 identifies the three-phase power grid. The rectified voltage is the internal voltage of the vehicle-mounted charger and is obtained by sampling in the vehicle-mounted charger. Conventional approaches identify the presence of input voltages based on phase and line voltages, lacking double checks of voltage rationality and rectified voltage. According to the embodiment, the power grid type can be correctly identified through double verification of voltage rationality and rectified voltage, and further hardware damage caused by misoperation of an internal relay of the vehicle-mounted charger 2 can be avoided.
When the line voltage rationality judging module 4122 judges that the acquired line voltage UV, the line voltage VW, and the line voltage WU of the alternating current power supply signal all have input voltages, the line voltage rationality judging module 4122 can accurately judge the phase sequence of the three-phase power grid by a line voltage polarity combination mode, is compatible with different phase sequences of the three-phase power grid, and improves the robustness of the vehicle-mounted charger 2 to the phase sequence of the power grid.
The phase sequence of the three-phase power grid comprises a positive sequence and a negative sequence, and if the phase sequences are different in the process that the electric equipment is connected into the three-phase power grid, the electric equipment can not normally operate and can break down when being started. Therefore, the method is very important for accurately judging the phase sequence of the three-phase power grid.
Referring to fig. 5, if the three-phase grid is in a positive sequence, the voltage of the line voltage UV is at the valley (t1), and the voltage of the line voltage VW is smaller than that of the line voltage WU; if the three-phase power grid is in a negative sequence, the voltage of the line voltage VW is larger than the voltage of the line voltage WU. Similarly, the three-phase power grid is in a positive sequence, the voltage of the line voltage UV is at the peak (t2), and the voltage of the line voltage VW is greater than that of the line voltage WU; if the three-phase power grid is in a negative sequence, the voltage of the line voltage VW is smaller than that of the line voltage WU.
Referring to fig. 6, the power grid smart phase locking module 413 autonomously selects an algorithm according to the power grid type identified by the power grid type identification module 412 to obtain the power grid frequency and the power grid phase. The grid smart phase locking module 413 may include: a virtual quadrature module 4131, a three-phase to quadrature module 4132, an output selection module 4133, and a software phase lock module 4134.
Since the control system of the on-board charger needs to be compatible with single-phase and three-phase charging, the virtual quadrature module 4131 is used for the single-phase grid phase locking, and the three-phase to quadrature module 4132 is used for the three-phase grid phase locking.
The virtual quadrature module 4131 converts the voltage of the single-phase grid into a corresponding two-phase stationary quadrature voltage. Referring to fig. 7, the virtual quadrature module 4131 uses the single-phase grid voltage as the a-phase input in the three-phase stationary coordinate and keeps in synchronization with the a-phase, and then lags by 90 ° with a constant-magnitude voltage to establish the β -phase input in the CLARK coordinate, forming a two-phase stationary quadrature voltage.
The three-phase to quadrature module 4132 converts the voltage of the three-phase grid to a corresponding two-phase stationary quadrature voltage. That is, the three-phase to quadrature module 4132 converts the three-phase voltage to a two-phase stationary quadrature voltage using a CLARK conversion. The CLARK transformation is to change the variable in an abc coordinate system with three phases being static and mutually different by 120 degrees into an alpha beta coordinate system with two phases being static and mutually different by 90 degrees, thereby simplifying the control process. The CLARK transformation is a relatively mature method in the prior art and will not be described herein.
The output selection module 4133 receives the grid type identified by the grid type identification module 412, selects one of the virtual quadrature module 4131 and the three-phase to quadrature module 4132 according to the grid type, and transmits the selection result to the software phase locking module 4134. Namely, the output selection module 4133 selects the outputs of the first two modules as the inputs of the software phase locking module 4134 according to the type of the power grid, and integrates the common parts of the single-phase locking and the three-phase locking, so that the calculation load rate is reduced.
The software phase locking module 4134 performs calculation according to the selection result to obtain the grid frequency and the grid phase. Referring to fig. 8, it shows the software phase lock module 4134 algorithm block diagram, which uses PARK transformation to convert two phase stationary quadrature voltages (V α and V β) into two phase rotating quadrature voltages (Vd and Vq), the PARK transformation is the projection of the voltages on the α and β axes, equivalent to the d and q axes. Based on an instantaneous reactive power theory, the active voltage (Vd) and the grid voltage vector are synchronous, the voltage (Vq) of a reactive axis is set to be zero, and closed-loop tracking is carried out. Attenuating the high-frequency error component through a Loop Filter (LF), and taking the remaining difference frequency component (delta omega) as the input of a Voltage Controlled Oscillator (VCO), so that when the Loop jumps out of a locking state, the Loop is improved to be stored for a short time, and the Loop is quickly recovered; and obtaining the power grid frequency omega and the power grid phase theta through the voltage-controlled oscillator.
Referring to fig. 9, the signal operation module 414 includes: an ac/dc separation module 4141, a root mean square extraction module 4142, an ac peak extraction module 4143, and an efficiency calculation module 4144.
The ac and dc separation module 4141 separates the ac component and the dc component in the collected dc power signal by a sliding window filtering algorithm to obtain the battery ac ripple and the battery dc component. The ac component of the dc power signal is introduced by the ac power network 1.
The root mean square extraction module 4142 iteratively calculates the effective values of the grid voltage and current in real time according to the grid frequency.
The ac peak value extraction module 4143 calculates an ac sinusoidal distortion degree according to the effective values of the grid voltage and current and the rectification value output by the vehicle-mounted charger 2, and feeds back the ac sinusoidal distortion degree to peak value calculation to obtain a grid voltage peak value. And the alternating current peak value extraction module 4143 feeds back the calculated alternating current sine distortion degree to peak value calculation, so that the influence of power grid distortion on peak value extraction can be eliminated. The specific principle is as follows: setting a standard rectification coefficient to be 1.4, dividing an actual rectification voltage value output by the vehicle-mounted charger 2 by an effective value of the power grid voltage calculated by the root mean square extraction module 4142 to obtain an actual rectification coefficient, dividing the actual rectification coefficient by the standard rectification coefficient to obtain an alternating current distortion, and finally multiplying an originally collected power grid voltage peak value by the alternating current distortion to obtain an actual power grid voltage peak value. Compared with the traditional signal operation, the method increases the extraction of the battery ripple and the decoupling of the voltage peak value to the power grid distortion, and can solve the problem of large detection deviation of the battery voltage and the battery alternating current ripple during charging. And the signal operation module 414 separates the ac component and the dc component in the dc power signal according to the real-time frequency of the power grid, and provides a basis for the charging strategy change of the BMS when the power grid quality is poor, so as to effectively protect the battery.
The communication module 42 transmits the processing result to the battery management system 5. And the control module 43 performs switching tube control according to the processing result so as to realize the drive control of the vehicle-mounted charger 2. The diagnosis module 44 performs fault diagnosis based on the processing result. Namely, the diagnosis module 44 diagnoses according to the output of the high-compatibility signal processing module 41, triggers a fault when the output exceeds a threshold value, and feeds back the fault to the control module 43, and the control module 43 turns off the driving of a switching tube.
In the control system of the vehicle-mounted charger provided in this embodiment, the power grid connection identification module 411 may accurately identify whether a power grid is connected by combining the ac voltage amplitude and the polarity; the power grid type identification module 412 ensures that the single-phase and three-phase power grids are identified accurately through phase voltage and line voltage rationality and secondary confirmation of the power grid type by using the rectified voltage.
In the control system of the vehicle-mounted charger provided by the invention, the signal operation module 414 separates the direct current component and the alternating current component of the battery voltage and the current according to the real-time frequency of the power grid, and the charging strategy change of the BMS when the power grid quality is poor is taken as a basis, so that the battery is effectively protected.
In the control system of the vehicle-mounted charger provided by the invention, the power grid type identification module 412 improves the phase sequence identification correctness in a line voltage polarity combination mode.
Namely, by adopting the control system of the vehicle-mounted charger provided by the embodiment, the accuracy of identification and detection of the control system of the vehicle-mounted charger can be improved.
In addition, the invention also provides a control method of the vehicle-mounted charger, which utilizes the control system of the vehicle-mounted charger to control the vehicle-mounted charger, and specifically comprises the following steps:
step S1: the method comprises the steps that an alternating current power supply signal provided by an alternating current power grid and a direct current power supply signal converted by a vehicle-mounted charger are collected and processed in real time through a digital controller;
step S2: the battery management system receives the processing result of the digital controller and sends a charging instruction to the vehicle-mounted charger according to the processing result;
step S3: and the digital controller drives the vehicle-mounted charger according to the processing result, so that the vehicle-mounted charger converts an input alternating current power supply signal into a direct current power supply signal according to the charging instruction so as to charge a power battery.
In step S1, the digital controller mainly includes a high-compatibility signal processing module, a communication module, a control module, and a diagnostic module.
The high-compatibility signal processing module is mainly used for collecting high-voltage network signals, namely collecting alternating current power supply signals and direct current power supply signals. The high-compatibility signal processing module is also used for processing the collected alternating current power supply signal and the collected direct current power supply signal and respectively transmitting the processing results to the communication module, the control module and the diagnosis module.
The high-compatibility signal processing module comprises a power grid connection identification module, a power grid type identification module, a power grid intelligent phase locking module and a signal operation module.
And the power grid connection identification module identifies whether the alternating current power grid is connected or not according to the collected alternating current power supply signal. The grid connection identification module may include a voltage amplitude identification module, a voltage polarity identification module, and a grid connection identification module.
The voltage amplitude identification module is used for judging the amplitude of the phase voltage and the line voltage of the collected alternating current power supply signal; the voltage polarity identification module judges the polarity of the phase voltage and the line voltage of the collected alternating current power supply signal; and the power grid connection identification module judges whether the alternating current power grid is connected or not according to the amplitude judgment result and the polarity judgment result.
And the power grid type identification module identifies the power grid type of the alternating current power grid when the power grid connection identification module identifies the connection of the alternating current power grid. The power grid type identification module comprises: the device comprises a phase voltage rationality judging module, a line voltage rationality judging module and a power grid type identifying module.
The phase voltage rationality judgment module judges the rationality of the phase voltage range of the collected alternating current power supply signal; the line voltage reasonability judgment module judges the reasonability of the line voltage range of the collected alternating current power supply signal; and when the phase voltage and the line voltage are in a reasonable range, the power grid type identification module identifies the power grid type of the alternating current power grid. When the line voltage rationality judging module judges that the line voltage UV, the line voltage VW and the line voltage WU of the collected alternating current power supply signal have input voltage, the line voltage rationality judging module can accurately judge the phase sequence of the three-phase power grid through a line voltage polarity combination mode.
The electric wire netting intelligence phase locking module includes: the device comprises a virtual orthogonal module, a three-phase to orthogonal module, an output selection module and a software phase locking module. The virtual quadrature module is used for the single-phase grid phase locking, and the three-phase to quadrature module is used for the three-phase grid phase locking. And the output selection module receives the power grid type identified by the power grid type identification module and selects one of the virtual orthogonal module and the three-phase to orthogonal module according to the power grid type. And the software phase locking module calculates according to the selection result to obtain the frequency and the phase of the power grid.
The signal operation module includes: an alternating current and direct current separation module, a root mean square extraction module, an alternating current peak extraction module and an efficiency calculation module, wherein,
the alternating current and direct current separation module separates alternating current components and direct current components in the collected direct current power supply signals through a sliding window filtering algorithm to obtain battery alternating current ripples and battery direct current components;
the root-mean-square extraction module iteratively calculates effective values of the voltage and the current of the power grid in real time according to the frequency of the power grid;
the alternating current peak value extraction module calculates an alternating current sinusoidal distortion degree according to the effective values of the voltage and the current of the power grid and a rectification value output by the vehicle-mounted charger, and feeds the alternating current sinusoidal distortion degree back to peak value calculation to obtain a voltage peak value of the power grid;
and the efficiency calculation module calculates the charging efficiency according to the power grid voltage peak value and the battery direct-current component.
By adopting the control method of the vehicle-mounted charger provided by the embodiment, the accuracy of identification and detection of a control system of the vehicle-mounted charger can be improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (14)
1. A control system of a vehicle-mounted charger is characterized by comprising an alternating current power grid, the vehicle-mounted charger, a power battery, a digital controller and a battery management system, wherein,
the alternating current power grid provides alternating current power supply signals to the vehicle-mounted charger and the digital controller;
the digital controller is used for respectively carrying out real-time acquisition and processing on the alternating current power supply signal and the direct current power supply signal converted by the vehicle-mounted charger, transmitting a processing result to the battery management system, and carrying out drive control on the vehicle-mounted charger according to the processing result;
the battery management system sends a charging instruction to the vehicle-mounted charger according to the processing result;
and the vehicle-mounted charger converts the input alternating current power supply signal into the direct current power supply signal according to the charging instruction so as to charge the power battery.
2. The control system of the vehicle-mounted charger according to claim 1, wherein the digital controller comprises a high-compatibility signal processing module, a communication module, a control module and a diagnosis module, wherein,
the high-compatibility signal processing module is used for respectively collecting and processing the alternating current power supply signal and the direct current power supply signal converted by the vehicle-mounted charger in real time, and transmitting the processing result to the communication module, the control module and the diagnosis module;
the communication module transmits the processing result to the battery management system;
the control module controls a switching tube according to the processing result so as to realize the driving control of the vehicle-mounted charger;
and the diagnosis module carries out fault diagnosis according to the processing result.
3. The control system of the vehicle-mounted charger according to claim 2, characterized in that the alternating current power signal comprises alternating voltage and alternating current; the dc power signal includes a battery voltage and a battery current.
4. The control system of the vehicle-mounted charger according to claim 3, wherein the high-compatibility signal processing module comprises a power grid connection identification module, a power grid type identification module, a power grid smart phase locking module and a signal operation module, wherein,
the power grid connection identification module identifies whether the alternating current power grid is connected or not according to the collected alternating current power supply signal;
the power grid type identification module identifies the power grid type of the alternating current power grid when the power grid connection identification module identifies the connection of the alternating current power grid;
the power grid intelligent phase locking module autonomously selects an algorithm according to the power grid type identified by the power grid type identification module to acquire power grid frequency and power grid phase;
the signal operation module extracts the battery alternating current ripple, the battery direct current component, the effective values of the grid voltage and current, the grid voltage peak value and the charging efficiency in real time according to the grid frequency acquired by the grid intelligent phase-locking module.
5. The control system of the on-board charger according to claim 4, characterized in that said grid types comprise a single-phase grid and a three-phase grid.
6. The control system of the vehicle-mounted charger according to claim 5, characterized in that the circuit of the alternating current grid comprises a U-phase line, a V-phase line, a W-phase line and an N-line, the alternating voltage of the alternating current power supply signal comprises a phase voltage UN, a phase voltage VN and a phase voltage WN, and the line voltages comprise a line voltage UV, a line voltage VW and a line voltage WU.
7. The control system of the vehicle-mounted charger according to claim 6, wherein the grid connection identification module comprises a voltage amplitude identification module, a voltage polarity identification module and a grid connection identification module, wherein,
the voltage amplitude identification module is used for carrying out amplitude judgment on the phase voltage and the line voltage of the collected alternating current power supply signal and transmitting an amplitude judgment result to the power grid connection identification module;
the voltage polarity identification module carries out polarity judgment on the phase voltage and the line voltage of the collected alternating current power supply signal and transmits a polarity judgment result to the power grid connection identification module;
and the power grid connection identification module judges whether the alternating current power grid is connected or not according to the amplitude judgment result and the polarity judgment result.
8. The control system of the vehicle-mounted charger according to claim 7, wherein the grid connection identification module determines that the alternating current grid is not connected when the amplitude determination result is that the amplitudes of the phase voltage and the line voltage are continuously out of a threshold range and/or the polarity determination result is that the polarities of the phase voltage and the line voltage are continuously unchanged; otherwise, the power grid connection identification module judges that the alternating current power grid is connected.
9. The control system of the vehicle-mounted charger according to claim 6, characterized in that the grid type identification module comprises: a phase voltage rationality judgment module, a line voltage rationality judgment module and a power grid type identification module, wherein,
the phase voltage rationality judgment module judges the rationality of the phase voltage range of the collected alternating current power supply signal and transmits a phase voltage judgment result to the power grid type identification module;
the line voltage reasonability judgment module judges the reasonability of the line voltage range of the collected alternating current power supply signal and transmits a line voltage judgment result to the power grid type identification module;
and the power grid type identification module identifies the power grid type of the alternating current power grid when the phase voltage and the line voltage are both in a reasonable range.
10. The control system of the vehicle-mounted charger according to claim 9, wherein the grid type identification module identifies the vehicle-mounted charger as a single-phase grid when an input voltage exists in only one of the phase voltage UN, the phase voltage VN and the phase voltage WN, and a rectified voltage output by the vehicle-mounted charger conforms to characteristics of the single-phase grid; when input voltages exist in the line voltage UV, the line voltage VW and the line voltage WU, and meanwhile, when the rectified voltage output by the vehicle-mounted charger meets the characteristics of a three-phase power grid, the power grid type identification module identifies the three-phase power grid.
11. The control system of the vehicle-mounted charger according to claim 9, characterized in that when the line voltage rationality judgment module judges that the line voltage UV, the line voltage VW and the line voltage WU of the collected ac power signal all have input voltages, the line voltage rationality judgment module judges the phase sequence of the three-phase power grid in a line voltage polarity combination manner.
12. The control system of the vehicle-mounted charger according to claim 6, wherein the power grid smart phase-locking module comprises: a virtual orthogonal module, a three-phase to orthogonal module, an output selection module and a software phase locking module, wherein,
the virtual orthogonal module converts the voltage of the single-phase power grid into corresponding two-phase static orthogonal voltage;
the three-phase to orthogonal module converts the voltage of a three-phase power grid into corresponding two-phase static orthogonal voltage;
the output selection module receives the power grid type identified by the power grid type identification module, selects one of the virtual orthogonal module and the three-phase to orthogonal module according to the power grid type, and transmits a selection result to the software phase locking module;
and the software phase locking module calculates according to the selection result to obtain the frequency and the phase of the power grid.
13. The control system of the vehicle-mounted charger according to claim 6, characterized in that the signal operation module comprises: an alternating current and direct current separation module, a root mean square extraction module, an alternating current peak extraction module and an efficiency calculation module, wherein,
the alternating current and direct current separation module separates alternating current components and direct current components in the collected direct current power supply signals to obtain battery alternating current ripples and battery direct current components;
the root-mean-square extraction module iteratively calculates effective values of the voltage and the current of the power grid in real time according to the frequency of the power grid;
the alternating current peak value extraction module calculates an alternating current sinusoidal distortion degree according to the effective values of the voltage and the current of the power grid and a rectification value output by the vehicle-mounted charger, and feeds the alternating current sinusoidal distortion degree back to peak value calculation to obtain a voltage peak value of the power grid;
and the efficiency calculation module calculates the charging efficiency according to the power grid voltage peak value and the battery direct-current component.
14. A control method of a vehicle-mounted charger, which is controlled by a control system of the vehicle-mounted charger according to any one of claims 1 to 13, is characterized by comprising the following steps:
the method comprises the steps that an alternating current power supply signal provided by an alternating current power grid and a direct current power supply signal converted by a vehicle-mounted charger are collected and processed in real time through a digital controller;
the battery management system receives the processing result of the digital controller and sends a charging instruction to the vehicle-mounted charger according to the processing result;
and the digital controller drives the vehicle-mounted charger according to the processing result, so that the vehicle-mounted charger converts an input alternating current power supply signal into a direct current power supply signal according to the charging instruction so as to charge a power battery.
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