CN115719941A - Excitation inrush current suppression device and method and ship energy storage system - Google Patents
Excitation inrush current suppression device and method and ship energy storage system Download PDFInfo
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Abstract
The device transmits a first conduction signal to a contactor when detecting an electrifying voltage signal on the primary side of a transformer through a processor, and then the contactor conducts a signal channel between a photovoltaic inverter and the primary side of the transformer according to the first conduction signal; when the contactor is closed, the processor transmits a first control signal to the photovoltaic inverter, and then the photovoltaic inverter outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetization, reactive compensation is provided for the transformer for demagnetization, excitation surge current generated by switching-on of the transformer is restrained, misoperation of a protection device is avoided, power supply quality is improved, and additional loss of the transformer is reduced.
Description
Technical Field
The application relates to the technical field of energy storage and power supply, in particular to an excitation inrush current suppression device and method and a ship energy storage system.
Background
For new energy ships, the combination of the lithium battery and the power system is a small power energy storage system, and energy is transferred in a direct-current networking mode. The capacity of the transformer in the large-scale ship direct current power distribution system is usually large, and the transformer occupies a large proportion of the whole ship load, and is one of important devices of a ship power system. When the ship normally runs, the power transformer can generate steady-state magnetic flux in the power transformer in the running process, when the transformer is cut off in a power failure mode, the steady-state magnetic flux cannot disappear immediately due to the conservation of the loop magnetic flux, and residual magnetism which is equal to the steady-state magnetic flux at the last moment in magnitude and has the same polarity can be reserved. When the transformer is switched on and connected to the grid in no-load mode, due to the influence of magnetic flux saturation, magnetic hysteresis and nonlinearity of an iron core of the transformer, when the magnetic flux direction generated by the input normal working voltage is the same as the original remanence polarity of the transformer, magnetic circuit saturation can be caused by magnetic biasing and remanence, and magnetizing inrush current (such as magnetizing inrush current with the value of 7-8 times of rated current) is induced. The magnetizing inrush current contains a large amount of harmonic waves, which are harmonic sources of a power grid and reduce power supply quality, and the residual magnetism can also cause additional loss increase of the transformer, so that the harmonic waves generated by waveform distortion of the transformer can also generate strong damage to sensitive electronic elements.
In the existing magnetizing inrush current restraining mode brought by transformer switching-on, the hardware cost is high, the reliability of restraining the magnetizing inrush current is low, the malfunction of a protection device is still easy to cause, and the additional loss of the transformer is increased.
Disclosure of Invention
Therefore, in order to solve the problems in the conventional excitation inrush current suppression method caused by transformer switching-on, a need exists to provide an excitation inrush current suppression device, an excitation inrush current suppression method and a ship energy storage system, which can enable the primary side of a transformer to quickly reach a steady-state magnetic flux, suppress excitation inrush current caused by transformer no-load switching-on, avoid malfunction of a protection device, improve power supply quality and reduce additional loss of the transformer.
In a first aspect, the present application provides a magnetizing inrush current suppression device, including:
a photovoltaic inverter configured to output a first modulated electrical signal of a preset voltage amplitude and a preset duration according to a first control signal;
the contactor is connected between the photovoltaic inverter and the primary side of the transformer; the contactor is configured to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer according to the first conduction signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetizing;
the processor is respectively connected with the photovoltaic inverter, the contactor and the primary side of the transformer; the processor is configured to transmit a first conduction signal to the contactor when detecting an electrifying voltage signal on the primary side of the transformer; the processor is further configured to transmit a first control signal to the photovoltaic inverter when the contactor is closed.
Optionally, the first control signal includes a first control sub-signal, a second control sub-signal, a third control sub-signal, and a fourth control sub-signal;
the processor sequentially transmits the first control sub-signal, the second control sub-signal, the third control sub-signal and the fourth control sub-signal to the photovoltaic inverter;
the photovoltaic inverter transmits a first modulation electric signal with a first preset voltage amplitude and a preset duration to the primary side of the transformer according to the first control sub-signal; the photovoltaic inverter transmits a first modulation electric signal with a second preset voltage amplitude and preset duration to the primary side of the transformer according to the second control sub-signal; the photovoltaic inverter transmits a first modulation electric signal with a third preset voltage amplitude and a preset duration to the primary side of the transformer according to the third control sub-signal; the photovoltaic inverter transmits a first modulation electric signal with a fourth preset voltage amplitude and preset duration to the primary side of the transformer according to the fourth control sub-signal; the first preset voltage amplitude is smaller than the second preset voltage amplitude, the second preset voltage amplitude is smaller than the third preset voltage amplitude, and the third preset voltage amplitude is smaller than the fourth preset voltage amplitude.
Optionally, the processor is further configured to obtain an electrical parameter at a primary side of the transformer, and transmit a second control signal to the photovoltaic inverter according to the electrical parameter; and the photovoltaic inverter generates a second modulation electric signal according to the second control signal and transmits the second modulation electric signal to the primary side of the transformer for phase compensation.
Optionally, the primary side of the transformer is connected with the alternating current side of the power grid through a first breaker;
the processor is further used for controlling the first circuit breaker to be closed according to the obtained magnetizing result and the phase compensation result when the magnetizing result and the phase compensation result meet preset conditions, and transmitting a first disconnection signal to the contactor based on preset delay time so that the contactor disconnects a signal channel between the photovoltaic inverter and the primary side of the transformer.
Optionally, the photovoltaic inverter includes a photovoltaic module, a photovoltaic booster circuit, a bidirectional dc conversion circuit, an inverter circuit, and a first energy storage module;
the input end of the photovoltaic booster circuit is connected with the photovoltaic module, and the output end of the photovoltaic booster circuit is respectively connected with the first end of the bidirectional direct-current conversion circuit and the input end of the inverter circuit; the second end of the bidirectional direct current conversion circuit is connected with the first energy storage module; the output end of the inverter circuit is connected with the contactor.
Optionally, the photovoltaic inverter further includes a first filter circuit; the first filter circuit is connected between the inverter circuit and the contactor.
Optionally, the photovoltaic inverter further comprises a second circuit breaker; the second circuit breaker is connected between the first energy storage module and the first load.
In a second aspect, the present application provides a magnetizing inrush current suppression method, including the steps of;
when an electrifying voltage signal on the primary side of the transformer is detected, a first conduction signal is transmitted to the contactor; the first conduction signal is used for indicating the contactor to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer, so that the photovoltaic inverter transmits a first modulation electric signal to the primary side of the transformer for magnetizing;
transmitting a first control signal to the photovoltaic inverter when the contactor is closed; the first control signal is used for instructing the photovoltaic inverter to output a first modulation electric signal with a preset voltage amplitude and a preset duration.
In a third aspect, the present application provides a ship energy storage system, including a second energy storage module, a power conversion module, a first circuit breaker, a transformer, and any one of the magnetizing inrush current suppression devices; the transformer comprises a primary side of the transformer;
the second energy storage module is connected with a power conversion module, the power conversion module is connected with a first breaker, and the first breaker is connected with the primary side of the transformer;
the excitation inrush current suppression device is connected with the primary side of the transformer.
Optionally, the ship energy storage system further includes a second filter circuit; the second filter circuit is connected between the power conversion module and the first circuit breaker.
One of the above technical solutions has the following advantages and beneficial effects:
the magnetizing inrush current suppression device comprises a photovoltaic inverter, a contactor and a processor; the contactor is connected between the photovoltaic inverter and the primary side of the transformer; the processor is respectively connected with the photovoltaic inverter, the contactor and the primary side of the transformer; when the processor detects an electrifying voltage signal on the primary side of the transformer, a first conduction signal is transmitted to the contactor, and then the contactor conducts a signal channel between the photovoltaic inverter and the primary side of the transformer according to the first conduction signal; when the contactor is closed, the processor transmits a first control signal to the photovoltaic inverter, and then the photovoltaic inverter outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetization, reactive compensation is provided for the transformer for demagnetization, and the purpose of inhibiting excitation surge current generated by transformer closing is achieved. According to the transformer primary side magnetizing device, the transformer primary side is magnetized by controlling reactive compensation of the photovoltaic inverter before the transformer is switched on at the power-on initial stage of the alternating current power grid side, so that the transformer primary side quickly reaches steady-state magnetic flux, excitation inrush current caused by no-load switching-on of the transformer is suppressed, misoperation of the protection device is avoided, power supply quality is improved, and additional loss of the transformer is reduced.
Drawings
Fig. 1 is a first structural schematic diagram of a magnetizing inrush current suppression device in an embodiment of the present application;
fig. 2 is a second structural diagram of a magnetizing inrush current suppression device according to an embodiment of the present application;
fig. 3 is a third structural diagram of a magnetizing inrush current suppression device in an embodiment of the present application;
fig. 4 is a fourth structural diagram of a magnetizing inrush current suppression device in the embodiment of the present application;
fig. 5 is a schematic flow chart of a magnetizing inrush current suppression method in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a ship energy storage system in an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, the term "plurality" shall mean two as well as more than two.
In a traditional magnetizing inrush current mode caused by transformer switching-on, the following two methods are mainly adopted: the first is to connect a resistor in series between the primary side of the main transformer and the power grid, and to suppress a larger exciting current by adjusting the resistor; however, this method is difficult to determine the resistance value and the time of bypassing the resistor, and the resistor generates a certain amount of heat during the pre-charging process. And the second method is that a pre-magnetizing transformer with smaller capacity is connected in series between the primary side of the main transformer and the power grid, the pre-magnetizing transformer is used for pre-magnetizing the main transformer, a pre-magnetizing loop is disconnected after the main transformer establishes steady-state magnetic flux before the main transformer is switched on, and the main transformer loop is closed, so that the main transformer exciting current is inhibited. However, in the mode, when the main transformer is switched on, the selection is not proper; still have greater exciting currents; if the pre-magnetizing transformer needs to be separately matched with corresponding medium-voltage switchgear on the shore power removal side, the hardware cost is increased.
The excitation surge suppression device, the excitation surge suppression method and the ship energy storage system can be applied to new energy ships, such as new energy ships with passenger capacity of 50 passenger seats or more or ship length of 20M or more. For a new energy ship, a lithium battery and a power system are combined to form a small power energy storage system, and energy is transferred in a direct-current networking mode. According to the method, through reactive compensation of the photovoltaic inverter, the primary side of the transformer can quickly reach steady-state magnetic flux, the generation of excitation inrush current caused by no-load switching-on of the transformer is restrained, the misoperation of a protection device is avoided, the power supply quality is improved, and the additional loss of the transformer is reduced. In addition, the application of the ship energy storage system in new energy ships can improve the utilization rate of renewable energy, can also convert solar energy into electric energy, reduces the cost of power utilization, simultaneously has fewer harmonics of the electric energy generated by a photovoltaic power generation system, and can output reactive power, so that energy conservation and emission reduction can be realized, and the quality of a power grid can be improved.
In one embodiment, as shown in fig. 1, a magnetizing inrush current suppression device is provided, and includes a photovoltaic inverter 100, a contactor 200, and a processor 300.
The photovoltaic inverter 100 is a photovoltaic energy storage inverter, and is configured to convert solar energy into electric energy, store the converted electric energy, invert the converted electric energy, and feed back the electric energy after inversion processing to the primary side of the transformer. The contactor 200 is an alternating current contactor 200, and the contactor 200 is connected between the photovoltaic inverter 100 and the primary side of the transformer; and then through the break-make of control contactor 200, can realize switching on or breaking off the signal channel between photovoltaic inverter 100 and the transformer primary side. The transformer comprises a primary side of the transformer and a secondary side of the transformer.
The processor 300 may be used for data acquisition, data processing, and the like, for example, the processor 300 is connected to the photovoltaic inverter 100, the contactor 200, and the primary side of the transformer, respectively; further, the processor 300 may collect the power-on voltage signal at the primary side of the transformer, process the power-on voltage signal, and then control the on/off of the contactor 200 according to the processing result. The processor 300 is further configured to control the operating state of the photovoltaic inverter 100, so that the photovoltaic inverter 100 outputs the first modulated electrical signal with the preset voltage amplitude and the preset duration to the primary side of the transformer.
For example, the magnetizing inrush current suppression device can be applied to a ship energy storage system. The ship energy storage system can comprise a ship alternating current power grid, a transformer and a high-voltage load, wherein the transformer comprises a transformer primary side and a transformer secondary side, the high-voltage load refers to a 220V or 380V load, a first circuit breaker is arranged between the ship alternating current power grid and the transformer primary side, and a third circuit breaker is arranged between the transformer secondary side and the high-voltage load. Based on the connection of the contactor 200 between the photovoltaic inverter 100 and the primary side of the transformer; the processor 300 is respectively connected with the photovoltaic inverter 100, the contactor 200 and the primary side of the transformer; after the ship energy storage system receives a power-on instruction of a cab, each unit of the system starts self-checking, and after the self-checking of each unit is completed (no fault), a ship alternating current power grid is powered on, and at the moment, the first circuit breaker and the third circuit breaker are in an off state. The processor 300 detects an electrifying voltage signal at the primary side of the transformer, and transmits a first conduction signal to the contactor 200 when the electrifying voltage signal at the primary side of the transformer is detected; the contactor 200 conducts a signal channel between the photovoltaic inverter 100 and the primary side of the transformer according to the first conduction signal. The processor 300 detects the state of the contactor 200 in real time, transmits a first control signal to the photovoltaic inverter 100 when the contactor 200 is closed, and then the photovoltaic inverter 100 outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the photovoltaic inverter 100 transmits the first modulation electric signal to the primary side of the transformer for magnetizing, thereby realizing the purpose of providing reactive compensation for the transformer, eliminating residual magnetism of the transformer and inhibiting excitation inrush current caused by no-load closing of the transformer. Further, after the transformer is magnetized, the processor 300 may control the first breaker to be turned on, and control the contactor 200 to be turned off, so as to implement grid-connected switching on of the transformer. Before the transformer is connected to the grid and switched on, the processor 300 controls the third breaker to be switched on, so that the ship energy storage system is completely powered on, and high-quality power is supplied to the high-voltage load side.
In the above embodiment, in the initial power-on stage of the ac power grid side and before the transformer is switched on, the primary side of the transformer is magnetized by controlling the reactive compensation of the photovoltaic inverter 100, so that the primary side of the transformer quickly reaches the steady-state magnetic flux, the magnetizing inrush current caused by the no-load switching-on of the transformer is suppressed, and the malfunction of the protection device is avoided, thereby improving the power supply quality and reducing the additional loss of the transformer.
In one example, the first control signal includes a first control sub-signal, a second control sub-signal, a third control sub-signal, and a fourth control sub-signal; the processor 300 sequentially transmits the first control sub-signal, the second control sub-signal, the third control sub-signal, and the fourth control sub-signal to the photovoltaic inverter 100.
The photovoltaic inverter 100 transmits a first modulation electrical signal with a first preset voltage amplitude and a preset duration to the primary side of the transformer according to the first control sub-signal; the photovoltaic inverter 100 transmits a first modulation electrical signal of a second preset voltage amplitude and a preset duration to the primary side of the transformer according to the second control sub-signal; the photovoltaic inverter 100 transmits a first modulation electrical signal with a third preset voltage amplitude and a preset duration to the primary side of the transformer according to the third control sub-signal; the photovoltaic inverter 100 transmits a first modulation electrical signal of a fourth preset voltage amplitude and a preset duration to the primary side of the transformer according to the fourth control sub-signal; the first preset voltage amplitude is smaller than the second preset voltage amplitude, the second preset voltage amplitude is smaller than the third preset voltage amplitude, and the third preset voltage amplitude is smaller than the fourth preset voltage amplitude.
The first control sub-signal, the second control sub-signal, the third control sub-signal and the fourth control sub-signal may be PWM signals with different duty ratios. The first modulated electrical signal may be a three-phase sinusoidal alternating current signal.
Based on the first preset voltage amplitude being smaller than the second preset voltage amplitude, the second preset voltage amplitude being smaller than the third preset voltage amplitude, the third preset voltage amplitude being smaller than the fourth preset voltage amplitude, the first preset voltage amplitude, the second preset voltage amplitude, the third preset voltage amplitude and the fourth preset voltage amplitude can be obtained according to system presets; the preset duration may be preset by the system. For example, the first preset voltage magnitude may be set to 25% of the rated voltage of the transformer; the second predetermined voltage magnitude may be 50% of the rated voltage of the transformer; the third predetermined voltage magnitude may be 75% of the rated voltage of the transformer; the fourth predetermined voltage magnitude may be 100% of the rated voltage of the transformer; the preset duration may be set to 3 minutes (min).
For example, the processor 300 may transmit the first control sub-signal to the photovoltaic inverter 100 when the contactor 200 is closed, and then the photovoltaic inverter 100 transmits the first modulation electrical signal with the first preset voltage amplitude and the preset duration to the primary side of the transformer according to the first control sub-signal, so as to implement the first magnetizing on the primary side of the transformer. When the first magnetizing is completed, the processor 300 transmits a second control sub-signal to the photovoltaic inverter 100, and then the photovoltaic inverter 100 transmits a first modulation electrical signal of a second preset voltage amplitude and a preset duration to the primary side of the transformer according to the second control sub-signal, so as to realize the second magnetizing on the primary side of the transformer. When the second magnetizing is completed, the processor 300 transmits the third control sub-signal to the photovoltaic inverter 100, and then the photovoltaic inverter 100 transmits the first modulation electrical signal of the third preset voltage amplitude and the preset duration to the primary side of the transformer according to the third control sub-signal, so as to realize the third magnetizing on the primary side of the transformer. When the third magnetizing is completed, the processor 300 transmits a fourth control sub-signal to the photovoltaic inverter 100, and then the photovoltaic inverter 100 transmits a first modulation electrical signal of a fourth preset voltage amplitude and a preset duration to the primary side of the transformer according to the fourth control sub-signal, so as to realize the fourth magnetizing on the primary side of the transformer. The primary side of the transformer is magnetized by sequentially increasing the preset voltage amplitude value, so that the effect of eliminating the residual magnetism of the transformer can be improved.
In an example, the processor 300 may transmit the first control sub-signal to the photovoltaic inverter 100 when the contactor 200 is closed, and then the photovoltaic inverter 100 performs SPWM modulation on the input dc power signal according to the first control sub-signal, and adjusts the amplitude of the modulation wave, so that the output voltage of the first modulation electrical signal (i.e., the three-phase sinusoidal ac signal) output by the photovoltaic inverter 100 gradually increases to 25% of the rated voltage (50 HZ), magnetizes the primary coil of the transformer, and after keeping for 3min, the output voltage of the first modulation electrical signal output by the photovoltaic inverter 100 gradually decreases to 0, thereby implementing the first magnetization on the primary side of the transformer.
When the processor 300 completes the first magnetizing, the second control sub-signal is transmitted to the photovoltaic inverter 100, and then the photovoltaic inverter 100 performs SPWM modulation on the input dc power signal according to the second control sub-signal, and adjusts the amplitude of the modulated wave, so that the output voltage of the first modulated electrical signal (i.e. the three-phase sinusoidal ac signal) output by the photovoltaic inverter 100 gradually increases to 50% of the rated voltage (50 HZ), the primary coil of the transformer is magnetized, and after the voltage is maintained for 3min, the output voltage of the first modulated electrical signal output by the photovoltaic inverter 100 gradually decreases to 0, thereby realizing the second magnetizing on the primary side of the transformer.
When the processor 300 completes the second magnetizing, the third control sub-signal is transmitted to the photovoltaic inverter 100, and then the photovoltaic inverter 100 performs SPWM modulation on the input dc power signal according to the third control sub-signal, and adjusts the amplitude of the modulation wave, so that the output voltage of the first modulation electrical signal (i.e. the three-phase sinusoidal ac signal) output by the photovoltaic inverter 100 gradually increases to 75% of the rated voltage (50 HZ), the primary coil of the transformer is magnetized, and after the voltage is maintained for 3min, the output voltage of the first modulation electrical signal output by the photovoltaic inverter 100 gradually decreases to 0, thereby realizing the third magnetizing on the primary side of the transformer.
When the processor 300 completes the third magnetizing, the fourth control sub-signal is transmitted to the photovoltaic inverter 100, and then the photovoltaic inverter 100 performs SPWM modulation on the input dc power signal according to the fourth control sub-signal, and adjusts the amplitude of the modulation wave, so that the output voltage of the first modulation electrical signal (i.e. the three-phase sinusoidal ac signal) output by the photovoltaic inverter 100 gradually increases to 100% of the rated voltage (50 HZ), the primary coil of the transformer is magnetized, and after the voltage is maintained for 3min, the output voltage of the first modulation electrical signal output by the photovoltaic inverter 100 is slowly decreased to 0, so as to realize the fourth magnetizing on the primary side of the transformer, thereby greatly improving the effect of eliminating residual magnetism of the transformer, realizing the suppression of excitation inrush current caused by no-load switching of the transformer, avoiding malfunction of the protection device, improving the power supply quality, and reducing the additional loss of the transformer.
In one example, the processor 300 is further configured to obtain an electrical parameter of a primary side of the transformer, and transmit a second control signal to the photovoltaic inverter 100 according to the electrical parameter; the photovoltaic inverter 100 generates a second modulation electrical signal according to the second control signal, and transmits the second modulation electrical signal to the primary side of the transformer for phase compensation.
The electrical parameter may be a phase, a frequency, and an amplitude of a voltage signal on the primary side of the transformer. The processor 300 can acquire electrical parameters such as phase, frequency and amplitude of the primary side voltage of the transformer, and transmit a second control signal to the photovoltaic inverter 100 according to the electrical parameters; the photovoltaic inverter 100 generates a second modulation electrical signal according to the second control signal, transmits the second modulation electrical signal to the primary side of the transformer, provides an output voltage which slowly increases from zero to a rated voltage to the primary side of the transformer, and performs phase compensation on the primary side of the transformer.
In one example, the primary side of the transformer is connected to the ac power grid of the ship through the first circuit breaker, and then the processor 300 may further obtain phase, frequency and amplitude electrical parameters of the voltage on the ac power grid side of the ship, and phase-lock each electrical parameter; processor 300 transmits a second control signal to photovoltaic inverter 100 based on each electrical parameter; the photovoltaic inverter 100 generates a second modulation electrical signal with a voltage amplitude gradually increasing from zero to the rated voltage of the transformer according to the second control signal, and transmits the second modulation electrical signal to the primary side of the transformer, so that phase compensation is performed on the primary side of the transformer.
In one example, the primary side of the transformer is connected to the ac side of the grid through a first circuit breaker. The processor 300 is further configured to control the first circuit breaker to be closed according to the obtained magnetizing result and the phase compensation result, when the magnetizing result and the phase compensation result meet a preset condition, and transmit a first disconnection signal to the contactor 200 based on a preset delay time, so that the contactor 200 disconnects a signal channel between the photovoltaic inverter 100 and the primary side of the transformer.
The preset delay time may be obtained according to a system preset, for example, the preset delay time may be set to 30 milliseconds (ms).
For example, the processor 300 may collect an electrical parameter of the primary side of the transformer and an electrical parameter of the ac power grid side of the ship, and when the electrical parameter of the primary side of the transformer and the electrical parameter of the ac power grid side of the ship are in the same frequency, the same amplitude, and the same phase, it is determined that a result of magnetizing the primary side of the transformer and a result of phase compensation satisfy a preset condition, so as to control the first circuit breaker to be closed. The processor 300 transmits a first disconnection signal to the contactor 200 based on a preset delay time when detecting that the first breaker is closed, so that the contactor 200 disconnects a signal path between the photovoltaic inverter 100 and the primary side of the transformer.
It should be noted that the photovoltaic inverter 100 outputs reactive power during the demagnetization of the primary side of the transformer. After the transformer is switched on, the photovoltaic inverter 100 may also output active power to supply power to the high-voltage load if necessary.
In one embodiment, as shown in fig. 2, the photovoltaic inverter 100 includes a photovoltaic module 110, a photovoltaic boost circuit 120, a bidirectional dc conversion circuit 130, an inverter circuit 140, and a first energy storage module 150. The input end of the photovoltaic boost circuit 120 is connected to the photovoltaic module 110, and the output end of the photovoltaic boost circuit 120 is respectively connected to the first end of the bidirectional dc conversion circuit 130 and the input end of the inverter circuit 140; the second end of the bidirectional dc conversion circuit 130 is connected to the first energy storage module 150; the output end of the inverter circuit 140 is connected to the contactor 200.
Among them, the photovoltaic module 110 is a core part of the solar power generation system and is also the most important part of the solar power generation system. Photovoltaic module 110 can be used to convert solar energy into electrical energy. The photovoltaic BOOST circuit 120 can BOOST the dc voltage output by the photovoltaic module 110 to the dc voltage required by the inverter circuit 140 through BOOST according to the BUS voltage, and has a filtering effect on the dc voltage output by the photovoltaic module 110.
Bidirectional direct current conversion circuit 130 (two-way DC-DC circuit) can adopt BUCK/BOOST circuit topology, possesses the two-way conversion function of step-up and step-down, and step-up and step-down chopper circuit, first energy storage module 150 and photovoltaic module 110 side two-way step-up and step-down can be compatible multiple different voltage range's first energy storage module 150 promptly.
The inverter circuit 140 can realize bidirectional energy transfer between the ac power grid of the ship and the first energy storage module 150, and simultaneously has a reactive compensation function to slow down current conflict, stabilize voltage drop, reduce reactive loss, and ensure power supply quality. The first energy storage module 150 may be a lithium battery module. For example, the first energy storage module 150 may adopt a lithium battery pack with a smaller capacity to temporarily supply power to the ship, and when the light is strong, solar energy is converted into electric energy to be stored, so as to reduce the cost of electricity consumption.
For example, when the processor 300 detects an electrifying voltage signal on the primary side of the transformer, it determines that the ship completes the first half electrifying process, and transmits a first conducting signal to the contactor 200, so that the contactor 200 is closed, and at the same time, the photovoltaic booster circuit 120 is controlled to be in a non-working state, and the inverter circuit 140 and the bidirectional dc conversion circuit 130 are controlled to be in a working state, and by transmitting the first control signal to the inverter circuit 140, the inverter circuit 140 outputs a first modulation electrical signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the inverter circuit 140 transmits the first modulation electrical signal to the primary side of the transformer for magnetization, thereby realizing providing reactive compensation for the ship transformer for demagnetization, and further achieving suppression of transformer switching-on inrush current.
In one example, when the ship converter equipment is relatively large and the power is relatively large, the processor 300 controls the contactor 200 to be closed, and controls the photovoltaic boost circuit 120 to be in a non-operating state, and controls the inverter circuit 140 and the bidirectional dc conversion circuit 130 to be in an operating state. Reactive compensation is provided to the ac power grid side of the ship through the first energy storage module 150 to improve the power factor of the ac power grid of the ship.
In one example, as shown in fig. 3, photovoltaic inverter 100 further includes a first filtering circuit 160; the first filter circuit 160 is connected between the inverter circuit 140 and the contactor 200.
The first filter circuit 160 may be an LC low-pass filter circuit, and the first filter circuit 160 may filter the ac signal output by the inverter circuit 140, filter out an interference signal, reduce harmonic interference of the sine wave at the output end, and obtain a first modulated electrical signal (i.e., an ac sine wave signal) with better quality.
Based on that the first filter circuit 160 is connected between the inverter circuit 140 and the contactor 200, and then the processor 300 can transmit a first control signal to the photovoltaic inverter 100 when the contactor 200 is closed, the photovoltaic inverter 100 outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, and after the first modulation electric signal is subjected to filtering processing by the first filter circuit 160, the first modulation electric signal subjected to filtering processing is transmitted to the primary side of the transformer, so that magnetizing on the primary side of the transformer is realized, and further, the effect of eliminating residual magnetism of the transformer can be improved.
In one example, as shown in fig. 4, the photovoltaic inverter 100 further includes a second circuit breaker 170; the second circuit breaker 170 is connected between the first energy storage module 150 and the first load 180.
The first load 180 may be a low-voltage load with a 24VDC power supply voltage on the ship, such as a signal lamp, a buzzer, a display screen, and a lighting lamp.
Illustratively, based on the application of the magnetizing inrush current suppression device to a ship energy storage system on a new energy ship, by installing the photovoltaic module 110 on the new energy ship, in the running process of the ship, when the illumination is good, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and simultaneously controls the photovoltaic boost circuit 120 and the bidirectional dc conversion circuit 130 to be in the working state, and controls the inverter circuit 140 to be in the non-working state, so that the photovoltaic module 110 can supply power to the first load 180, and when the energy of the photovoltaic module 110 is surplus, the solar energy can be converted into the electric energy to be stored in the first energy storage module 150.
In the running process of the ship, when the illumination is general and the power supply requirement of the first load 180 cannot be sufficiently met, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and simultaneously controls the photovoltaic boosting circuit 120 and the bidirectional direct current conversion circuit 130 to be in the working state, and controls the inverter circuit 140 to be in the non-working state, so that the photovoltaic module 110 and the first energy storage module 150 can simultaneously supply power to the first load 180.
In the running process of the ship, when the illumination is poor and the power supply requirement of the first load 180 cannot be met, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and controls the photovoltaic boosting circuit 120, the bidirectional direct current conversion circuit 130 and the inverter circuit 140 to be in a non-working state, so that the first load 180 is supplied with power through the first energy storage module 150.
When the ship is parked and the illumination is relatively good, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and controls the photovoltaic boosting circuit 120 and the bidirectional direct current conversion circuit 130 to be in the working state, and controls the inverter circuit 140 to be in the non-working state, so that the photovoltaic module 110 can convert the solar energy into the electric energy to be stored in the first energy storage module 150, and in addition, the photovoltaic module 110 can supply power to the first load 180,
when the ship is parked and the light is normal, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and controls the photovoltaic boosting circuit 120 and the bidirectional direct current conversion circuit 130 to be in the working state, and controls the inverter circuit 140 to be in the non-working state, and the first load 180 can be supplied with power by generating power through the photovoltaic module 110 due to the low power demand of the first load 180 when the ship is parked.
When the ship is parked and the illumination is poor and the photovoltaic module 110 cannot meet the requirement of supplying power to the first load 180, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and controls the photovoltaic boosting circuit 120, the bidirectional direct current conversion circuit 130 and the inverter circuit 140 to be in a non-working state, so as to supply power to the first load 180 through the first energy storage module 150.
When the ship starts to start, the processor 300 controls the contactor 200 to be opened and the second circuit breaker 170 to be closed, and controls the photovoltaic boosting circuit 120, the bidirectional direct current conversion circuit 130 and the inverter circuit 140 to be in a non-working state, so as to provide starting power for the ship control equipment through the first energy storage module 150.
In the above embodiment, through the flexible energy conversion between photovoltaic inverter 100 and the solar energy, the utilization rate of renewable energy sources can be improved, the solar energy can be also utilized to convert into electric energy, the cost of power utilization is reduced, in addition, the harmonic waves of the electric energy generated by photovoltaic inverter 100 are less, and meanwhile, the output reactive power not only can realize energy conservation and emission reduction, the cost is reduced, the utilization rate of energy is improved, but also the quality of a power grid can be improved.
In one embodiment, as shown in fig. 5, there is provided a magnetizing inrush current suppression method including the steps of;
step S510, when detecting an electrifying voltage signal on the primary side of the transformer, transmitting a first conduction signal to a contactor; the first conduction signal is used for indicating the contactor to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetizing.
Step S520, when the contactor is closed, transmitting a first control signal to the photovoltaic inverter; the first control signal is used for instructing the photovoltaic inverter to output a first modulation electric signal with a preset voltage amplitude and a preset duration.
For example, the magnetizing inrush current suppression method can be applied to a ship energy storage system. When the ship energy storage system receives a power-on instruction of a cab, each unit of the system starts self-checking, and after the self-checking of each unit is completed (no fault), the ship alternating-current power grid is powered on, and at the moment, the first circuit breaker is in a disconnected state. The processor detects an electrifying voltage signal on the primary side of the transformer, and transmits a first conduction signal to the contactor when the electrifying voltage signal on the primary side of the transformer is detected; and the contactor conducts a signal channel between the photovoltaic inverter and the primary side of the transformer according to the first conduction signal. The processor detects the state of the contactor in real time, transmits a first control signal to the photovoltaic inverter when the contactor is closed, and then the photovoltaic inverter outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetization, reactive compensation is provided for the transformer, residual magnetism of the transformer is eliminated, and excitation surge current caused by no-load switching-on of the transformer is inhibited.
In the above embodiment, at the initial stage of power supply on the ac power grid side and before the transformer is switched on, the primary side of the transformer is magnetized by controlling the reactive compensation of the photovoltaic inverter, so that the primary side of the transformer quickly reaches the steady-state magnetic flux, thereby suppressing the magnetizing inrush current caused by the no-load switch-on of the transformer, avoiding the malfunction of the protection device, improving the power supply quality, and reducing the additional loss of the transformer.
It should be understood that, although the steps in the flowchart of fig. 5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 6, there is further provided a ship energy storage system, which includes a second energy storage module 20, a power conversion module, a first circuit breaker 40, a transformer 50, and any one of the magnetizing inrush current suppression devices 10; the transformer 50 includes a primary side of the transformer 50; the second energy storage module 20 is connected with a power conversion module, the power conversion module is connected with a first circuit breaker 40, and the first circuit breaker 40 is connected with the primary side of a transformer 50; the magnetizing inrush current suppressing device is connected to the primary side of the transformer 50.
The second energy storage module 20 may be a lithium Battery (BAT) system, and the power conversion module may include a fuse 330, a DC-DC module 310, and a DC-AC module 320. The DC-DC module 310 is connected between the second energy storage module 20 and the fuse 330, and the DC-AC module 320 is connected between the fuse 330 and the first circuit breaker 40.
Illustratively, the marine energy storage system further includes a second filter circuit 60; the second filter circuit 60 is connected between the power conversion module and the first circuit breaker 40. The second filter circuit 60 may be an LCL filter circuit, and the second filter circuit 60 may be configured to filter an AC sine wave output by the DC-AC module 320, so as to output a filtered signal. The marine energy storage system further comprises a third circuit breaker arranged between the secondary side of the transformer 50 and the high voltage load.
When the system receives a power-on instruction of the cab, each unit of the system starts self-checking, and after the self-checking of each unit is completed (no fault), the second energy storage module 20 closes the high-voltage relay, and when a high-voltage signal output by the second energy storage module 20 is detected, the DC-DC module 310 is controlled to be started automatically; when detecting the high voltage at the output side of the DC-DC module 310, controlling the DC-AC module 320 to self-start, ending the power-on process at the first half section of the ship energy storage system, and at this time, the first circuit breaker 40 and the third circuit breaker are in an off state.
Based on the connection of the contactor 200 between the photovoltaic inverter and the primary side of the transformer 50; the processor is respectively connected with the photovoltaic inverter, the contactor 200 and the primary side of the transformer 50. The processor detects an electrifying voltage signal at the primary side of the transformer 50, and transmits a first conduction signal to the contactor 200 when detecting the electrifying voltage signal at the primary side of the transformer 50; the contactor 200 turns on a signal path between the photovoltaic inverter and the primary side of the transformer 50 according to the first turn-on signal. The processor detects the state of the contactor 200 in real time, transmits a first control signal to the photovoltaic inverter when the contactor 200 is closed, and then the photovoltaic inverter outputs a first modulation electric signal with a preset voltage amplitude and a preset duration according to the first control signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer 50 for magnetization, reactive compensation is provided for the transformer 50, residual magnetism of the transformer 50 is eliminated, and excitation surge current caused by no-load closing of the transformer 50 is suppressed. Further, after the transformer 50 is magnetized, the processor may control the first circuit breaker 40 to be turned on and control the contactor 200 to be turned off, so as to implement grid-connection and switch-on of the transformer 50. Before the transformer 50 is switched on in a grid-connected mode, the processor controls the third breaker to be conducted, complete electrification of the ship energy storage system is further completed, and high-quality power supply is conducted to the high-voltage load side.
In the above embodiment, in the initial power-on stage of the ac power grid side and before the transformer 50 is switched on, the primary side of the transformer 50 is magnetized by controlling the reactive compensation of the photovoltaic inverter, so that the primary side of the transformer 50 quickly reaches the steady-state magnetic flux, the magnetizing inrush current caused by the no-load switching-on of the transformer 50 is suppressed, and the malfunction of the protection device is avoided, thereby improving the power supply quality and reducing the additional loss of the transformer 50.
In one embodiment, the present application provides a computer storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the magnetizing inrush current suppression method of any of the above.
In one example, a computer program when executed by a processor implements the steps of:
when an electrifying voltage signal on the primary side of the transformer is detected, a first conduction signal is transmitted to the contactor; the first conduction signal is used for indicating the contactor to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetizing. When the contactor is closed, transmitting a first control signal to the photovoltaic inverter; the first control signal is used for instructing the photovoltaic inverter to output a first modulation electric signal with a preset voltage amplitude and a preset duration.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, the computer program may include the processes of the embodiments of the division methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A magnetizing inrush current suppression device, comprising:
a photovoltaic inverter configured to output a first modulated electrical signal of a preset voltage amplitude and a preset duration according to a first control signal;
the contactor is connected between the photovoltaic inverter and the primary side of the transformer; the contactor is configured to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer according to a first conduction signal, so that the photovoltaic inverter transmits the first modulation electric signal to the primary side of the transformer for magnetizing;
the processor is respectively connected with the photovoltaic inverter, the contactor and the primary side of the transformer; the processor is configured to transmit the first conduction signal to the contactor when detecting a power-on voltage signal on the primary side of the transformer; the processor is further configured to transmit the first control signal to the photovoltaic inverter when the contactor is closed.
2. The magnetizing inrush current suppression device according to claim 1, wherein the first control signal includes a first control sub-signal, a second control sub-signal, a third control sub-signal, and a fourth control sub-signal;
the processor sequentially transmits the first control sub-signal, the second control sub-signal, the third control sub-signal and the fourth control sub-signal to the photovoltaic inverter;
the photovoltaic inverter transmits a first modulation electric signal with a first preset voltage amplitude and a preset duration to the primary side of the transformer according to the first control sub-signal; the photovoltaic inverter transmits a first modulation electric signal of a second preset voltage amplitude and a preset duration to the primary side of the transformer according to the second control sub-signal; the photovoltaic inverter transmits a first modulation electric signal with a third preset voltage amplitude and a preset duration to the primary side of the transformer according to the third control sub-signal; the photovoltaic inverter transmits a first modulation electric signal with a fourth preset voltage amplitude and preset duration to the primary side of the transformer according to the fourth control sub-signal; the first preset voltage amplitude is smaller than the second preset voltage amplitude, the second preset voltage amplitude is smaller than the third preset voltage amplitude, and the third preset voltage amplitude is smaller than the fourth preset voltage amplitude.
3. The excitation inrush current suppression device according to claim 2, wherein the processor is further configured to obtain an electrical parameter of a primary side of the transformer, and transmit a second control signal to the photovoltaic inverter according to the electrical parameter; and the photovoltaic inverter generates a second modulation electric signal according to the second control signal and transmits the second modulation electric signal to the primary side of the transformer for phase compensation.
4. The magnetizing inrush current suppression device according to claim 3, wherein the primary side of the transformer is connected to the ac side of the power grid through a first circuit breaker;
the processor is further used for controlling the first circuit breaker to be closed when the magnetizing result and the phase compensation result meet preset conditions according to the obtained magnetizing result and the phase compensation result, and transmitting a first disconnection signal to the contactor based on preset delay time so that the contactor disconnects a signal channel between the photovoltaic inverter and the primary side of the transformer.
5. The magnetizing inrush current suppression device according to any one of claims 1 to 4, wherein the photovoltaic inverter includes a photovoltaic module, a photovoltaic booster circuit, a bidirectional DC conversion circuit, an inverter circuit, and a first energy storage module;
the input end of the photovoltaic booster circuit is connected with the photovoltaic module, and the output end of the photovoltaic booster circuit is respectively connected with the first end of the bidirectional direct current conversion circuit and the input end of the inverter circuit; the second end of the bidirectional direct current conversion circuit is connected with the first energy storage module; and the output end of the inverter circuit is connected with the contactor.
6. The magnetizing inrush current suppression device according to claim 5, wherein the photovoltaic inverter further comprises a first filter circuit; the first filter circuit is connected between the inverter circuit and the contactor.
7. The magnetizing inrush current suppression device of claim 6, wherein the photovoltaic inverter further comprises a second circuit breaker; the second circuit breaker is connected between the first energy storage module and a first load.
8. A magnetizing inrush current suppression method is characterized by comprising the following steps:
when an electrifying voltage signal on the primary side of the transformer is detected, a first conduction signal is transmitted to the contactor; the first conduction signal is used for indicating the contactor to conduct a signal channel between the photovoltaic inverter and the primary side of the transformer, so that the photovoltaic inverter transmits a first modulation electric signal to the primary side of the transformer for magnetizing;
transmitting a first control signal to the photovoltaic inverter when the contactor is closed; the first control signal is used for instructing the photovoltaic inverter to output the first modulation electric signal with a preset voltage amplitude and a preset duration.
9. A ship energy storage system is characterized by comprising a second energy storage module, a power conversion module, a first circuit breaker, a transformer and the magnetizing inrush current suppression device of any one of claims 4 to 7; the transformer comprises a primary side of the transformer;
the second energy storage module is connected with the power conversion module, the power conversion module is connected with the first circuit breaker, and the first circuit breaker is connected with the primary side of the transformer;
and the excitation inrush current suppression device is connected with the primary side of the transformer.
10. The marine energy storage system of claim 9, further comprising a second filter circuit; the second filter circuit is connected between the power conversion module and the first circuit breaker.
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| CN202211547333.7A CN115719941A (en) | 2022-12-02 | 2022-12-02 | Excitation inrush current suppression device and method and ship energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117117794A (en) * | 2023-10-12 | 2023-11-24 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117117794A (en) * | 2023-10-12 | 2023-11-24 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
| CN117117794B (en) * | 2023-10-12 | 2024-02-27 | 广东省洛仑兹技术股份有限公司 | Transformer pre-magnetizing circuit and control method thereof |
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