CN110212628B - Switching method of solar photovoltaic power generation inversion control switching system - Google Patents
Switching method of solar photovoltaic power generation inversion control switching system Download PDFInfo
- Publication number
- CN110212628B CN110212628B CN201910335353.XA CN201910335353A CN110212628B CN 110212628 B CN110212628 B CN 110212628B CN 201910335353 A CN201910335353 A CN 201910335353A CN 110212628 B CN110212628 B CN 110212628B
- Authority
- CN
- China
- Prior art keywords
- switch
- switching
- power generation
- circuit
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a solar photovoltaic power generation inversion control switching system and a solar photovoltaic power generation inversion control switching method. The SPDT switch is normally connected with the contact point in a normal state, when sunlight irradiates, if the detection circuit detects that the load continuously and normally operates, the controller does not need to control, otherwise, the controller controls the SPDT switch to switch the inverter circuit to continuously and normally operate the alternating current load; when no sunlight irradiates, the controller controls the storage battery to supply power to the photovoltaic power generation system, and the continuous normal operation of the load is ensured. The invention provides a solar photovoltaic power generation inversion control switching system aiming at the problems of intermittency of photovoltaic power generation, fixity of an inverter circuit and the like.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a solar photovoltaic power generation inversion control system and a switching method.
Background
With the rapid consumption of non-renewable fossil energy and the increasing severity of environmental pollution problems caused by the non-renewable fossil energy, people are eagerly required to find clean alternative energy, so that the energy crisis can be relieved, and the environmental problems caused by burning fossil fuels such as greenhouse effect and the like can be effectively inhibited. Solar energy is used as a clean renewable energy source, and has the characteristics of no pollution, wide distribution of available resources, renewability and the like. The application of solar photovoltaic power generation has entered the departments such as industry, business, agriculture, communication, household appliances and public facilities from the military field and the aerospace field, and especially can be dispersedly used in remote areas, mountains, deserts, islands and rural areas to save the transmission lines with high cost.
Photovoltaic power generation is a direct power generation method that utilizes a solar-grade semiconductor electronic device to effectively absorb solar radiation energy and convert the solar radiation energy into electric energy, and is the mainstream of current solar power generation. However, due to the inherent fluctuation and intermittency of photovoltaic power generation, the output of photovoltaic power generation is not stable enough, and certain influence is caused on the application of the photovoltaic power generation.
Disclosure of Invention
The invention provides a solar photovoltaic power generation inversion control switching system aiming at the problems of intermittency and volatility of photovoltaic power generation, and the system can realize continuous stable normal power supply of a load end of the solar photovoltaic power generation system and the requirement of switching an inversion circuit when necessary (or fault) through the detection of a detection circuit and the regulation and control of a controller.
In order to realize the task, the invention adopts the following technical scheme:
the utility model provides a solar photovoltaic power generation contravariant control switching system, includes first switchable circuit N1, second switchable circuit N2, low pass filter, transformer, wherein:
the first switchable circuit N1 includes a first dc boost circuit and a first full bridge inverter circuit, the first dc boost circuit includes a first inductor L1, a first clamping diode D1, a first capacitor C1, and a fifth power switch Q5, wherein after L1, D1, and C1 are connected in series, one end is connected to the first contact of the first controllable switch SPDT1, and the other end is connected to the first contact of the second controllable switch SPDT 2; the collector of the Q5 is connected between L1 and D1, and the emitter is connected between C1 and the first contact of the SPDT 2; the first full-bridge inverter circuit comprises a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4, wherein after being connected in series with Q2 and Q3 and Q4, the Q1 and the Q3538 are connected in parallel at two ends of C1; a point a is taken from between Q1 and Q2, a point B is taken from between Q3 and Q4, a is connected to the first contact of the third controllable changeover switch SPDT3, B is connected to the first contact of the fourth controllable changeover switch SPDT 4;
the second switchable circuit N2 includes a second dc boost circuit and a second full bridge inverter circuit, the second dc boost circuit includes a second inductor L2, a second clamping diode D2, a second capacitor C2, and a tenth power switch Q10, wherein after L12, D2, and C2 are connected in series, one end is connected to the second contact of the first controllable switch SPDT1, and the other end is connected to the second contact of the second controllable switch SPDT 2; the collector of the Q10 is connected between the L2 and the D2, and the emitter is connected between the C2 and the second contact of the SPDT 2; the second full-bridge inverter circuit comprises a sixth power switch Q6, a seventh power switch Q7, an eighth power switch Q8 and a ninth power switch Q9, wherein Q6 and Q7 are connected in series, and Q8 and Q9 are connected in series and then connected in parallel at two ends of C2; a point C is taken from between Q6 and Q7, a point D is taken from between Q8 and Q9, C is connected to the second contact of the third controllable changeover switch SPDT3, D is connected to the second contact of the fourth controllable changeover switch SPDT 4;
the switching end of the first controllable switching switch SPDT1 and the switching end of the second controllable switching switch SPDT2 are respectively connected with the positive pole and the negative pole of the output end of the solar power generation device, and the solar power generation device is connected with a storage battery; the low-pass filter comprises a choke inductor L3 and a capacitor C3, wherein after the L3 and the C3 are connected in series, one end of the low-pass filter is connected with the switching end of a third controllable switch SPDT3, and the other end of the low-pass filter is connected with the switching end of a fourth controllable switch SPDT 4; the transformer is connected with two ends of the C3 in parallel, the transformer is connected with a load, and the load is connected with a detection circuit;
the switching system further comprises a controller, and the detection circuit, the SPDT1, the SPDT2, the SPDT3, the SPDT4, the solar power generation device, the storage battery and the first power switch Q1 to the tenth power switch Q10 are all connected to the controller.
A switching method of a solar photovoltaic power generation inversion control switching system comprises the following steps:
step 1, when sunlight irradiates the solar power generation device, the controller acquires the output voltage value of the solar power generation device and judges that the output voltage is in the normal output voltage range of the solar power generation device, and then the controller controls the switching system to enter a solar power supply mode:
the controller controls the switching ends of the four controllable switching switches SPDT1, SPDT2, SPDT3 and SPDT4 to be switched to the first contact point, so that the first switchable circuit N1 is connected into the system, and the controller controls the solar power generation device to charge the storage battery;
step 2, detecting the voltage and the current of the load according to the detection circuit to determine whether to continue entering a solar power supply mode or switch a storage battery power supply mode: when the voltage and the current of the load are larger than the set threshold values, the solar power supply mode is continued, and step 3 is executed; when the current working state of the storage battery is smaller than a set threshold value, the controller controls the storage battery to discharge, the system enters a storage battery power supply mode, simultaneously obtains storage battery parameters, judges whether the current storage battery works normally or not and judges whether the electric quantity is sufficient or not, and if the current storage battery works abnormally or the electric quantity is insufficient, the controller reminds workers to replace the storage battery through an alarm device;
step 3, when the solar power supply mode is continued, the detection circuit detects the change of the voltage and the current on the load in real time; keeping the current state to be continuously carried out under the normal state of the voltage and the current;
for the abnormal state 1, namely when the detection circuit detects that no voltage or no current exists, the controller acquires the current output voltage value of the solar power generation device, if the voltage value is larger than 0, the current sunlight irradiation is indicated, at the moment, the first switchable circuit N1 is considered to have a fault, the controller performs fault alarm through the alarm device, then the control system is connected to the second switchable circuit N2, all the controllable switches are switched from the normally closed first contact to the second contact at the same time in the process, and the switching process is required to be performed with power-off processing in advance; if the output voltage value of the solar power generation device is 0, indicating that the system is dark, and switching the system to a storage battery power supply mode; when the output voltage of the solar power generation device is greater than 0, the solar power supply mode is switched back;
for the abnormal state 2, when the detection circuit detects that the voltage and current values fluctuate greatly and are unstable, the switching frequency of the switching tube Q5 in the first switchable circuit N1 is adjusted first, so that the output voltage in the first direct current boost circuit is stable, and if the adjustment is invalid, the second switchable circuit N2 is switched to continue to operate.
Compared with the prior art, the invention has the following technical characteristics:
according to the switching system provided by the invention, through the detection of the detection circuit and the regulation and control of the controller, the continuous normal power supply of the load end of the solar photovoltaic power generation system and the requirement of switching the inverter circuit when necessary (or fault) are realized, the problems caused by inherent fluctuation and intermittence of photovoltaic power generation are solved, the smooth output of photovoltaic power generation is realized, stable electric energy is provided for special places, and a strategy method of the controller in the switching system is explained.
Drawings
FIG. 1 is a detailed structure diagram of a solar photovoltaic inversion control switching system according to the present invention;
FIG. 2 is a flow chart of the solar photovoltaic power generation inversion control switching system of the present invention;
fig. 3 is a diagram of a controller strategy method in the solar photovoltaic power generation inversion control switching system of the invention.
Detailed Description
The traditional solar photovoltaic inverter structure enables solar photovoltaic power generation to depend on weather requirements to a great extent, so that the generated energy is limited and cannot be continuously and stably output.
In order to enable the solar photovoltaic power generation system to generate power continuously and stably and reduce the influence of weather (namely when solar energy is not received), the invention designs a switchable inverter and a controller for controlling switching and charging and discharging of a storage battery on the basis of the solar photovoltaic power generation system to form the solar photovoltaic power generation inversion control switching system; fig. 1 is a detailed structure diagram of the inversion control switching system for solar photovoltaic power generation according to the present invention.
The invention discloses a solar photovoltaic power generation inversion control switching system, which comprises a first switchable circuit N1, a second switchable circuit N2, a low-pass filter and a transformer, wherein:
the first switchable circuit N1 includes a first dc boost circuit and a first full bridge inverter circuit, the first dc boost circuit includes a first inductor L1, a first clamping diode D1, a first capacitor C1, and a fifth power switch Q5, wherein after L1, D1, and C1 are connected in series, one end is connected to the first contact of the first controllable switch SPDT1, and the other end is connected to the first contact of the second controllable switch SPDT 2; the collector of the Q5 is connected between L1 and D1, and the emitter is connected between C1 and the first contact of the SPDT 2; the first full-bridge inverter circuit comprises a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4, wherein after being connected in series with Q2 and Q3 and Q4, the Q1 and the Q3538 are connected in parallel at two ends of C1; a point a is taken from between Q1 and Q2, a point B is taken from between Q3 and Q4, a is connected to the first contact of the third controllable changeover switch SPDT3, B is connected to the first contact of the fourth controllable changeover switch SPDT 4;
the second switchable circuit N2 includes a second dc boost circuit and a second full bridge inverter circuit, the second dc boost circuit includes a second inductor L2, a second clamping diode D2, a second capacitor C2, and a tenth power switch Q10, wherein after L12, D2, and C2 are connected in series, one end is connected to the second contact of the first controllable switch SPDT1, and the other end is connected to the second contact of the second controllable switch SPDT 2; the collector of the Q10 is connected between the L2 and the D2, and the emitter is connected between the C2 and the second contact of the SPDT 2; the second full-bridge inverter circuit comprises a sixth power switch Q6, a seventh power switch Q7, an eighth power switch Q8 and a ninth power switch Q9, wherein Q6 and Q7 are connected in series, and Q8 and Q9 are connected in series and then connected in parallel at two ends of C2; a point C is taken from between Q6 and Q7, a point D is taken from between Q8 and Q9, C is connected to the second contact of the third controllable changeover switch SPDT3, D is connected to the second contact of the fourth controllable changeover switch SPDT 4;
the switching end of the first controllable switching switch SPDT1 and the switching end of the second controllable switching switch SPDT2 are respectively connected with the positive pole and the negative pole of the output end of the solar power generation device, and the solar power generation device is connected with a storage battery; the low-pass filter comprises a choke inductor L3 and a capacitor C3, wherein after the L3 and the C3 are connected in series, one end of the low-pass filter is connected with the switching end of a third controllable switch SPDT3, and the other end of the low-pass filter is connected with the switching end of a fourth controllable switch SPDT 4; the transformer is connected with two ends of the C3 in parallel, the transformer is connected with a load, and the load is connected with a detection circuit;
the switching system further comprises a controller, and the detection circuit, the SPDT1, the SPDT2, the SPDT3, the SPDT4, the storage battery, and the first power switch Q1 to the tenth power switch Q10 are all connected to the controller.
In the scheme, the first switchable circuit N1 is in a normally-on state, and the electric energy output by the solar power generation device is transmitted to the load after direct current boosting, direct current conversion to alternating current, filtering and voltage transformation. The structure of the second switchable circuit N2 is the same as N1 as an alternative. In this embodiment, the Q1-Q10 may adopt an IGBT (insulated gate bipolar transistor), in the figure, the upper end of the Q1-Q10 is a collector, a diode connected in parallel between the collector and an emitter is a freewheeling diode, the Q1-Q10 switching tubes are all connected to a controller, and the switching frequency of these power switches is regulated and controlled by the controller.
The front ends of the first direct current boost circuit and the second direct current boost circuit of the first switchable circuit N1 and the second switchable circuit N2 are respectively connected with a first switch group consisting of a first controllable switch SPDT1 and a second controllable switch SPDT2, and the rear ends of the first full-bridge inverter circuit and the second full-bridge inverter circuit are connected with a second switch group consisting of a third controllable switch SPDT3 and a fourth controllable switch SPDT 4. In this scheme, every controllable change over switch has two contacts: the device comprises a first contact and a second contact, wherein the first contact is in a free and quick connection state. In a general case, the first contacts of the four controllable switches are closed, so that the first switchable circuit N1 is in a normally on state.
In the embodiment, an IGBT tube of Mitsubishi CT60AM-18F is selected as Q1-Q10, and an integrated fast recovery freewheeling diode is connected in parallel between the source electrode and the drain electrode of the IGBT tube; in the circuit, C1 is 200 microfarads, L1 is 10 millihenries; similarly, C2 was 2 millifarads, L2 was 10 millihenries; c3 was 100 microfarads and L4 was 1 millihenry.
In the direct current booster circuit, the calculation method of the inductance and the capacitance is as follows:
wherein D is the duty cycle, Uo、ioRespectively outputs of DC booster circuitOut of voltage and current, fSIs the switching frequency, R is the resistance of the AC load, Δ UoIs the ripple voltage.
In the scheme, the switching ends of four controllable change-over switches in the two switch groups are switched to the first contact or the second contact, and the charging and discharging of the storage battery are cooperatively controlled by the controller, and meanwhile, the adjustment of components in the N2 inverter circuit can be performed according to the power utilization requirement, for example, the conduction time (duty ratio in the direct current booster circuit) of the L2, the C2 and the switch tube Q10 is adjusted, so that the output voltage of the direct current booster circuit is changed. When the on-time of the Q10 is increased, and the appropriate L2 and C2 are selected according to the calculation method, the output voltage of the direct current booster circuit is increased. The maximum power point tracking MPPT is realized by a hill climbing method (disturbance observation method), the voltage value in an inverter circuit is gradually increased, the voltage variation ratio in a transformer T is maintained to be approximately unchanged, the output voltage is gradually increased, then the power variation is measured and compared with the power value before disturbance, if the power value is increased, the disturbance direction is correct, the disturbance continues to be carried out towards the same direction, and if the power value after disturbance is smaller than the value before disturbance, the disturbance is carried out towards the reverse direction, and the maximum power of the inverter is reached. The replacement of L2 and C2 can also change the input voltage and reactance value in the inverter circuit (i.e. change the inductive reactance of the reactor), thereby changing the inverter efficiency. These can achieve the required conversion efficiency and improve the function of Maximum Power Point Tracking (MPPT) in the inverter, etc., and then the first switch set and the second switch set are controlled to be switched by the controller. When the high-power inverter circuit needs to be switched to the lower-power inverter circuit, the IGBT (insulated gate bipolar transistor) tube of Q6-Q10 in the N2 circuit can be replaced by a MOSFET tube and the like.
In the scheme, the solar power generation device is connected with the storage battery in a bidirectional mode. The first switchable circuit N1 and the second switchable circuit N2 can be switched by the controller in advance to perform the power-off process. The load connection detection circuit can adopt the existing voltage and current detection circuit to detect the current and voltage of the alternating current load and the real-time change of the current and voltage. When the voltage and the current detected by the detection circuit are zero, no sunlight irradiation is indicated; when the voltage and current fluctuations detected by the detection circuit are large, it indicates that there is a problem in the instability of the first switchable circuit N1, and then the controller switches to the second switchable circuit N2. Whether sunlight irradiates exists or not and whether the first switchable circuit N1 is stable and normal or not are judged through the existence and the size change of the voltage and the current of the load, so that the battery is automatically regulated and controlled to supply power through a controller or the second switchable circuit N2 is switched; meanwhile, the controller can be manually operated to carry out switching work.
As shown in fig. 3, the switching system of the present invention works as follows:
step 1, when sunlight irradiates the solar power generation device, a display of the solar power generation device displays the current output voltage; solar power system is connected with the controller, and when the controller acquireed the voltage value and judged in solar power system's normal output voltage scope, controller control switching system got into the solar energy power supply mode:
the controller controls the switching ends of the four controllable switching switches SPDT1, SPDT2, SPDT3 and SPDT4 to be switched to a first contact point, so that the first switchable circuit N1 is connected to the system, at the moment, lower direct-current voltage output by the solar power generation device is loaded to the first direct-current boost circuit and the first full-bridge inverter circuit, and meanwhile, the controller controls the solar power generation device to charge the storage battery; the first DC booster circuit and the first full-bridge inverter circuit obtain the AC power with higher voltage, and then the needed AC voltage is applied to the load through the low-pass filter and the transformer T.
Step 2, detecting the voltage and current of the load according to the detection circuit to determine whether to continue entering a solar power supply mode or switch a storage battery power supply mode;
when the voltage and the current on the load are greater than or equal to the set threshold (namely greater than or equal to the condition of the power supply requirement of the load end, setting the threshold as a range value to avoid the possibility of frequent switching), continuing the solar power supply mode, and executing the step 3; when the current working state of the storage battery is smaller than the set threshold value, the controller controls the storage battery to discharge, the system enters a storage battery power supply mode, meanwhile, the parameters of the storage battery are obtained, whether the current storage battery works normally or whether the current storage battery is sufficient or not is judged, and if the current storage battery works abnormally or the current storage battery is insufficient, the controller reminds workers to replace the storage battery through an alarm device (such as a sound-light alarm); in the storage battery power supply mode, the direct-current voltage received by the first direct-current boosting circuit comes from the storage battery, and other processes are normally carried out.
Step 3, when the solar power supply mode is continued, the detection circuit detects the change of the voltage and the current on the load in real time; keeping the current state to be continuously carried out under the state that the voltage and the current are normal (namely the voltage and the current are within the range of the set threshold value);
for the abnormal state 1, namely when the detection circuit detects that no voltage or no current exists, the controller acquires the current output voltage value of the solar power generation device, if the voltage value is larger than 0, the current sunlight irradiation is indicated, at the moment, the first switchable circuit N1 is considered to have a fault, the controller performs fault alarm through an alarm device (such as an alarm lamp), then the control system is connected to the second switchable circuit N2, all the controllable change-over switches are simultaneously switched from the normally closed first contact to the second contact in the process, and meanwhile, the power-off process is performed in advance in the switching process; if the output voltage value of the solar power generation device is 0, indicating that the system is dark, and switching the system to a storage battery power supply mode; when the output voltage of the solar power generation device is greater than 0, the solar power supply mode is switched back;
for the abnormal state 2, when the detection circuit detects that the voltage and current values fluctuate greatly and are unstable, the switching frequency of the switching tube Q5 in the first switchable circuit N1 is adjusted, the adjustment strategy is that the controller performs proper fine adjustment (plus or minus 10%) on the switching frequency of the switching tube Q5, so that the output voltage in the first direct current boost circuit is stable, and if the adjustment is invalid, the switching circuit is switched to the second switchable circuit N2 to continue to operate.
In both the battery powered mode and the solar powered mode, there is a demand conditioning process. In other words, the components in the N2 inverter circuit are adjusted according to the power demand, for example, the on-time (duty ratio in the dc boost circuit) of L2, C2 and the switching tube Q10 is adjusted to change the magnitude of the output voltage of the dc boost circuit. When the conduction time of Q10 is increased, and proper L2 and C2 are selected according to the calculation method, the output voltage of the direct current booster circuit is increased; the same reduction in the on-time of Q10 is achieved while selecting the appropriate L2 and C2 according to the above calculation method, and the output voltage of the dc boost circuit is reduced. The maximum power point tracking MPPT is realized by a hill climbing method (disturbance observation method), the voltage value in an inverter circuit is gradually increased, the voltage variation ratio in a transformer T is kept approximately unchanged, the output voltage is gradually increased, then the power variation is measured and compared with the power value before disturbance, if the power value is increased, the disturbance direction is correct, the disturbance continues to be carried out in the same direction, and if the power value after disturbance is smaller than the value before disturbance, the disturbance is carried out in the opposite direction, and the maximum power of the inverter is reached. The replacement of L2 and C2 can also change the input voltage and reactance value in the inverter circuit (i.e. change the inductive reactance of the reactor), thereby changing the inverter efficiency. These can achieve the desired conversion efficiency and improve the utility of Maximum Power Point Tracking (MPPT) in the inverter. In addition, when the high-power inverter circuit needs to be switched to the inverter circuit with lower power, the IGBT (insulated gate bipolar transistor) tube of Q6-Q10 in the N2 circuit can be replaced by the MOSFET (metal oxide semiconductor field effect transistor) tube and the like, and finally, the controller controls the four SPDT switches to be switched from the normally closed 1 contact to the 2 contact at the same time, and the process needs to be carried out in advance for power failure treatment.
In summary, the invention realizes the continuous normal power supply of the load end of the solar photovoltaic power generation system through the detection of the detection circuit and the regulation and control of the controller. The invention mainly provides a relatively continuous and stable power generation mode capable of switching demand type for a solar photovoltaic power generation system, so that the solar photovoltaic power generation system can be well utilized in some places needing continuous power supply of solar power generation, and a strategy method of a controller in the switching system is explained.
Claims (1)
1. The switching method of the solar photovoltaic power generation inversion control switching system is characterized in that the solar photovoltaic power generation inversion control switching system comprises a first switchable circuit N1, a second switchable circuit N2, a low-pass filter and a transformer, wherein:
the first switchable circuit N1 includes a first dc boost circuit and a first full bridge inverter circuit, the first dc boost circuit includes a first inductor L1, a first clamping diode D1, a first capacitor C1, and a fifth power switch Q5, wherein after L1, D1, and C1 are connected in series, one end is connected to the first contact of the first controllable switch SPDT1, and the other end is connected to the first contact of the second controllable switch SPDT 2; the collector of the Q5 is connected between L1 and D1, and the emitter is connected between C1 and the first contact of the SPDT 2; the first full-bridge inverter circuit comprises a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4, wherein after being connected in series with Q2 and Q3 and Q4, the Q1 and the Q3538 are connected in parallel at two ends of C1; a point a is taken from between Q1 and Q2, a point B is taken from between Q3 and Q4, a is connected to the first contact of the third controllable changeover switch SPDT3, B is connected to the first contact of the fourth controllable changeover switch SPDT 4;
the second switchable circuit N2 includes a second dc boost circuit and a second full bridge inverter circuit, the second dc boost circuit includes a second inductor L2, a second clamping diode D2, a second capacitor C2, and a tenth power switch Q10, wherein after L12, D2, and C2 are connected in series, one end is connected to the second contact of the first controllable switch SPDT1, and the other end is connected to the second contact of the second controllable switch SPDT 2; the collector of the Q10 is connected between the L2 and the D2, and the emitter is connected between the C2 and the second contact of the SPDT 2; the second full-bridge inverter circuit comprises a sixth power switch Q6, a seventh power switch Q7, an eighth power switch Q8 and a ninth power switch Q9, wherein Q6 and Q7 are connected in series, and Q8 and Q9 are connected in series and then connected in parallel at two ends of C2; a point C is taken from between Q6 and Q7, a point D is taken from between Q8 and Q9, C is connected to the second contact of the third controllable changeover switch SPDT3, D is connected to the second contact of the fourth controllable changeover switch SPDT 4;
the switching end of the first controllable switching switch SPDT1 and the switching end of the second controllable switching switch SPDT2 are respectively connected with the positive pole and the negative pole of the output end of the solar power generation device, and the solar power generation device is connected with a storage battery; the low-pass filter comprises a choke inductor L3 and a capacitor C3, wherein after the L3 and the C3 are connected in series, one end of the low-pass filter is connected with the switching end of a third controllable switch SPDT3, and the other end of the low-pass filter is connected with the switching end of a fourth controllable switch SPDT 4; the transformer is connected with two ends of the C3 in parallel, the transformer is connected with a load, and the load is connected with a detection circuit;
the switching system also comprises a controller, and the detection circuit, the SPDT1, the SPDT2, the SPDT3, the SPDT4, the solar power generation device, the storage battery and the first power switch Q1 to the tenth power switch Q10 are all connected to the controller;
the switching method comprises the following steps:
step 1, when sunlight irradiates the solar power generation device, the controller acquires the output voltage value of the solar power generation device and judges that the output voltage is in the normal output voltage range of the solar power generation device, and then the controller controls the switching system to enter a solar power supply mode:
the controller controls the switching ends of the four controllable switching switches SPDT1, SPDT2, SPDT3 and SPDT4 to be switched to the first contact point, so that the first switchable circuit N1 is connected into the system, and the controller controls the solar power generation device to charge the storage battery;
step 2, detecting the voltage and the current of the load according to the detection circuit to determine whether to continue entering a solar power supply mode or switch a storage battery power supply mode: when the voltage and the current of the load are larger than the set threshold values, the solar power supply mode is continued, and step 3 is executed; when the current working state of the storage battery is smaller than a set threshold value, the controller controls the storage battery to discharge, the system enters a storage battery power supply mode, simultaneously obtains storage battery parameters, judges whether the current storage battery works normally or not and judges whether the electric quantity is sufficient or not, and if the current storage battery works abnormally or the electric quantity is insufficient, the controller reminds workers to replace the storage battery through an alarm device;
step 3, when the solar power supply mode is continued, the detection circuit detects the change of the voltage and the current on the load in real time; keeping the current state to be continuously carried out under the normal state of the voltage and the current;
for the abnormal state 1, namely when the detection circuit detects that no voltage or no current exists, the controller acquires the current output voltage value of the solar power generation device, if the voltage value is larger than 0, the current sunlight irradiation is indicated, at the moment, the first switchable circuit N1 is considered to have a fault, the controller performs fault alarm through the alarm device, then the control system is connected to the second switchable circuit N2, all the controllable switches are switched from the normally closed first contact to the second contact at the same time in the process, and the switching process is required to be performed with power-off processing in advance; if the output voltage value of the solar power generation device is 0, indicating that the system is dark, and switching the system to a storage battery power supply mode; when the output voltage of the solar power generation device is greater than 0, the solar power supply mode is switched back;
for the abnormal state 2, when the detection circuit detects that the voltage and current values fluctuate greatly and are unstable, the switching frequency of the switching tube Q5 in the first switchable circuit N1 is adjusted first, so that the output voltage in the first direct current boost circuit is stable, and if the adjustment is invalid, the second switchable circuit N2 is switched to continue to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335353.XA CN110212628B (en) | 2019-04-24 | 2019-04-24 | Switching method of solar photovoltaic power generation inversion control switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910335353.XA CN110212628B (en) | 2019-04-24 | 2019-04-24 | Switching method of solar photovoltaic power generation inversion control switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110212628A CN110212628A (en) | 2019-09-06 |
| CN110212628B true CN110212628B (en) | 2021-12-10 |
Family
ID=67786257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910335353.XA Expired - Fee Related CN110212628B (en) | 2019-04-24 | 2019-04-24 | Switching method of solar photovoltaic power generation inversion control switching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110212628B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769202B (en) * | 2021-03-24 | 2022-09-23 | 山东科技大学 | Dual-power wireless charging system and charging method for wave energy profile buoy |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356762A (en) * | 2001-12-25 | 2002-07-03 | 深圳安圣电气有限公司 | Parallelly connected reverse converter system |
| CN2785233Y (en) * | 2005-02-03 | 2006-05-31 | 北海新未来信息产业股份有限公司深圳分公司 | Modularization parallel connection inversion power supply equipment |
| CN1990298A (en) * | 2005-12-27 | 2007-07-04 | 中国科学院电工研究所 | Distributed series connection type hybrid power system |
| CN101128974A (en) * | 2005-02-25 | 2008-02-20 | 三菱电机株式会社 | Power conversion apparatus |
| CN101259829A (en) * | 2008-04-23 | 2008-09-10 | 北京交通大学 | Light rail vehicle auxiliary inverse power supply parallel device and control method thereof |
| CN102771042A (en) * | 2010-01-28 | 2012-11-07 | 伊斯帕诺-絮扎公司 | Method and device for controlling a polyphase electrical machine |
| CN103036243A (en) * | 2011-10-10 | 2013-04-10 | 三星Sdi株式会社 | Energy storage system and controlling method of the same |
| JP2013198354A (en) * | 2012-03-22 | 2013-09-30 | Daihen Corp | Ground-fault detector and system interconnection inverter system |
| CN103370873A (en) * | 2010-11-05 | 2013-10-23 | 路特艾电机有限责任公司 | Pitch motor drive circuit which can operate in emergency mode |
| CN203445831U (en) * | 2013-07-10 | 2014-02-19 | 安徽理工大学 | Independent photovoltaic power generation device based on four-switch five-level inverter |
| CN104065157A (en) * | 2014-06-09 | 2014-09-24 | 深圳微网能源管理系统实验室有限公司 | Uninterruptible power supply with improved power supply reliability |
| CN104538986A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Parallel inverter control method, host, slave machines and system |
| CN105680712A (en) * | 2016-03-24 | 2016-06-15 | 山东大学 | SHEPWM (selective harmonic elimination pulse width modulation) control circuit, double-T-type three-level SHEPWM inverter parallel system and method therefor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5660090B2 (en) * | 2012-08-27 | 2015-01-28 | 株式会社デンソー | Electric motor drive device and electric power steering device using the same |
-
2019
- 2019-04-24 CN CN201910335353.XA patent/CN110212628B/en not_active Expired - Fee Related
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1356762A (en) * | 2001-12-25 | 2002-07-03 | 深圳安圣电气有限公司 | Parallelly connected reverse converter system |
| CN2785233Y (en) * | 2005-02-03 | 2006-05-31 | 北海新未来信息产业股份有限公司深圳分公司 | Modularization parallel connection inversion power supply equipment |
| CN101128974A (en) * | 2005-02-25 | 2008-02-20 | 三菱电机株式会社 | Power conversion apparatus |
| CN1990298A (en) * | 2005-12-27 | 2007-07-04 | 中国科学院电工研究所 | Distributed series connection type hybrid power system |
| CN101259829A (en) * | 2008-04-23 | 2008-09-10 | 北京交通大学 | Light rail vehicle auxiliary inverse power supply parallel device and control method thereof |
| CN102771042A (en) * | 2010-01-28 | 2012-11-07 | 伊斯帕诺-絮扎公司 | Method and device for controlling a polyphase electrical machine |
| CN103370873A (en) * | 2010-11-05 | 2013-10-23 | 路特艾电机有限责任公司 | Pitch motor drive circuit which can operate in emergency mode |
| CN103036243A (en) * | 2011-10-10 | 2013-04-10 | 三星Sdi株式会社 | Energy storage system and controlling method of the same |
| JP2013198354A (en) * | 2012-03-22 | 2013-09-30 | Daihen Corp | Ground-fault detector and system interconnection inverter system |
| CN203445831U (en) * | 2013-07-10 | 2014-02-19 | 安徽理工大学 | Independent photovoltaic power generation device based on four-switch five-level inverter |
| CN104065157A (en) * | 2014-06-09 | 2014-09-24 | 深圳微网能源管理系统实验室有限公司 | Uninterruptible power supply with improved power supply reliability |
| CN104538986A (en) * | 2014-12-31 | 2015-04-22 | 阳光电源股份有限公司 | Parallel inverter control method, host, slave machines and system |
| CN105680712A (en) * | 2016-03-24 | 2016-06-15 | 山东大学 | SHEPWM (selective harmonic elimination pulse width modulation) control circuit, double-T-type three-level SHEPWM inverter parallel system and method therefor |
Non-Patent Citations (2)
| Title |
|---|
| Optimal design of EMI filters for PV system based on parasitic parameter and stability analysis;Jiao Zhang,等;《9th International Conference on Power Electronics-ECCE Asia》;20150605;第2744-2750页 * |
| 基于双向互补的储能系统控制策略及经济性分析;张婳 等;《电力建设》;20160831;第37卷(第8期);第96-101页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110212628A (en) | 2019-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101951011B (en) | Solar photovoltaic and commercial power combined power supply system and control method thereof | |
| US6914418B2 (en) | Multi-mode renewable power converter system | |
| CN103401463B (en) | The miniature photovoltaic grid-connected inverter that dc-link capacitance reduces and control method | |
| CN102163871B (en) | Multi-power supply system and method | |
| CN203387430U (en) | Micro photovoltaic grid connected inverter for optimization of direct current bus capacitor | |
| CN101710805A (en) | Independent photovoltaic power generation system and working method for tracking maximum power thereof | |
| CN105939107B (en) | A kind of quasi- boost switching DC-DC converter of mixed type | |
| CN203232352U (en) | MPPT (maximum power point tracking) solar controller based on BUCK circuit | |
| CN102780398A (en) | Intelligent component optimizer for solar photovoltaic cell panel and control method thereof | |
| CN103501020A (en) | Hybrid power supply system consisting of mains supply network and photovoltaic assembly and control method thereof | |
| CN105939112A (en) | High-gain quasi-switch boost DC-DC converter | |
| CN102097854A (en) | Multi-power supply feed system and control method thereof | |
| Patil et al. | Design and development of MPPT algorithm for high efficient DC-DC converter for solar energy system connected to grid | |
| CN104184396A (en) | Photovoltaic power supply system and control method thereof | |
| CN203840233U (en) | Single-phase photovoltaic grid-connected inverter | |
| CN201898365U (en) | Energy supply system for multiple power supplies | |
| CN110212628B (en) | Switching method of solar photovoltaic power generation inversion control switching system | |
| CN106787900B (en) | Boosting gird-connected inverter and its control method | |
| CN204696953U (en) | A kind of Z-source inverter being applicable to photovoltaic generation | |
| TWI460979B (en) | Control method of a dc-dc converter and a voltage coverting system | |
| Zhu et al. | Fuel cell high efficiency power converter for suppressing low frequency current ripple | |
| CN103916017A (en) | DC convertor with wide voltage range and wide load range | |
| CN101888095A (en) | Variable structure control method of grid-connected photovoltaic system | |
| CN204189064U (en) | A kind of photovoltaic cell MPPT system | |
| CN106849177A (en) | A kind of buck-boost grid-connected inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211210 |