CN103248097A - Photovoltaic charging system and method for all vanadium flow batteries - Google Patents
Photovoltaic charging system and method for all vanadium flow batteries Download PDFInfo
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- CN103248097A CN103248097A CN2013101775116A CN201310177511A CN103248097A CN 103248097 A CN103248097 A CN 103248097A CN 2013101775116 A CN2013101775116 A CN 2013101775116A CN 201310177511 A CN201310177511 A CN 201310177511A CN 103248097 A CN103248097 A CN 103248097A
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Abstract
The invention discloses a photovoltaic charging system and method for all vanadium flow batteries, wherein the system comprises a solar photovoltaic panel which is connected and used for outputting the alternated energy transmitted from the solar photovoltaic panel to a photovoltaic charging device of the DC (Direct Current) bus; the solar photovoltaic panel, the photovoltaic charging device and the all vanadium flow battery DC bus are connected in sequence, and the all vanadium flow battery of the DC bus is connected; the power supply unit of the DC bus is connected; the power supply unit comprises an UPS (Uninterrupted Power Supply) used for powering up a controller and an electrolyte circulating pump when the system starts; the electrolyte circulating pump of the all vanadium flow battery is connected, the state detector of the all vanadium flow batteries is connected, and the electrolyte circulating pump, the state detector, the controllable switch and the collector of the photovoltaic charging device are connected in sequence. According to the method provided by the invention, the solar energy utilization rate and the efficiency of the vanadium flow battery are improved, solar energy resources are fully used, the system provided by the invention is strong in applicability, convenient to use, and high in efficiency; and the cost is saved accordingly.
Description
Technical field
The present invention relates to the photovoltaic charged system and method for a kind of all-vanadium flow battery.
Background technology
Current all-vanadium flow battery is because charge-discharge performance is good, capacity is big, life-span is long, advantages such as fail safe height have broad application prospects, also substituting conventional storage battery day by day in solar energy photovoltaic system and electric automobiles uses, the continuous propelling of the more and more outstanding and energy-saving and emission-reduction of the variety of issue that causes along with energy shortage simultaneously, make photovoltaic charged system application also more and more widely, with reference to shown in Figure 1, the working power of the photovoltaic charged device control components and parts in the photovoltaic charged system of all-vanadium flow battery of the prior art utilizes the direct voltage of all-vanadium flow battery output to provide usually, and photovoltaic charged device utilizes the electric energy of solar energy photovoltaic panel output that all-vanadium flow battery is charged, all-vanadium flow battery uses for load after by inverter direct current being transformed to alternating current, then can not start photovoltaic charged device when all-vanadium flow battery is in initial condition or all-vanadium flow battery voltage when low so, and then can't realize that solar energy charges to all-vanadium flow battery; In addition if after utilizing commercial power rectification and voltage transformation, working power is provided for photovoltaic charged device control components and parts, not only can't be applicable to wild environment and when civil power interrupts, can't start photovoltaic charged device equally and charge to all-vanadium flow battery, above situation all greatly reduces the service efficiency of solar energy utilization ratio and all-vanadium flow battery, the waste solar energy resources.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop a kind of when not only guaranteeing the all-vanadium flow battery low-voltage photovoltaic charging device normally utilize, optimize the photovoltaic charged system and method for the all-vanadium flow battery that discharges and recharges control flow of all-vanadium flow battery simultaneously.
Technological means of the present invention is as follows:
The photovoltaic charged system of a kind of all-vanadium flow battery comprises:
Be used for that solar energy is converted to electric energy and export the solar energy photovoltaic panel of dc bus to;
Connect solar energy photovoltaic panel, be used for the electric energy that solar energy photovoltaic panel transmits is carried out exporting to after the conversion the photovoltaic charged device of dc bus;
Connect solar energy photovoltaic panel, photovoltaic charged device and all-vanadium flow battery respectively, be used for the electric energy that solar energy photovoltaic panel or photovoltaic charged device transmit is transferred to the dc bus of all-vanadium flow battery charging; Described dc bus one is rectified the utmost point and is connected the solar energy photovoltaic panel output plus terminal with gate-controlled switch by mutual diode in series VD1; Described diode VD1 anode connects solar energy photovoltaic panel, and negative electrode connects gate-controlled switch;
Connect dc bus, be used for storing the electric energy that dc bus transmits and the all-vanadium flow battery that store electrical energy is released into dc bus;
The power supply unit that connects dc bus; Described power supply unit comprises the UPS that gives controller and electrolyte circulating pump power supply when system starts, and this power supply unit connects electrolyte circulating pump and controller respectively;
The electrolyte circulating pump that connects all-vanadium flow battery;
Connect all-vanadium flow battery, be used for gathering in real time the state detector of the current voltage of all-vanadium flow battery and capacity status parameter;
Connect electrolyte circulating pump respectively, state detector, gate-controlled switch, photovoltaic charged device, be used for starting electrolyte circulating pump, control the gate-controlled switch closure according to the all-vanadium flow battery state parameter that state detector is gathered in real time less than the judged result of parameter preset threshold value I, control the gate-controlled switch disconnection and start photovoltaic charged device more than or equal to the judged result of parameter preset threshold value I according to the all-vanadium flow battery state parameter value that state detector is gathered in real time, the judged result that equals parameter preset threshold value II according to the real-time all-vanadium flow battery state parameter value of gathering of state detector is regulated the controller that all-vanadium flow battery is in floating charge state by the output current of controlling photovoltaic charged device;
As preferably, described power supply unit also comprises: rectifier, diode VD2, diode VD3 and chopper; Described rectifier input connects UPS; Described diode VD3 anode connects the rectifier output plus terminal; Described diode VD2 anode connects dc bus other end positive pole; Described diode VD2 negative electrode, diode VD3 negative electrode are connected with chopper input anode; Described chopper output connects electrolyte circulating pump and controller respectively;
As preferably, described power supply unit also comprises: diode VD4 and DC/AC converter; Described diode VD4 anode connects dc bus other end positive pole; Described diode VD4 negative electrode connects DC/AC converter input anode; Described DC/AC converter output terminal connects electrolyte circulating pump and controller respectively;
As preferably, also comprise the current sensor that is serially connected in the charge circuit that is constituted by solar energy photovoltaic panel, diode VD1, gate-controlled switch and dc bus; Described current sensor is connected with controller; The current signal that feeds back to controller when current sensor is during less than certain current threshold, and controller control gate-controlled switch disconnects;
As preferably, also comprise a plurality of AC load that connect all-vanadium flow battery by inverter; A plurality of described AC load adopt control strategy step by step, and controller changes connection and the disconnection of controlling the AC load of different priorities by inverter according to the all-vanadium flow battery state parameter that state detector feeds back to controller;
As preferably, described state detector comprises voltage sensor and SOC measurement module;
As preferably, the safety protective circuit of anti-overcharge, anti-overvoltage that described photovoltaic charged device has, anti-overflow, anti-reverse and anti-short circuit; Described controller has prevented the safety protective circuit put;
As preferably, also comprise the power consumption equipment and the DC load that connect dc bus; Described power consumption equipment is connected with dc bus by hand switch;
As preferably, described gate-controlled switch is D.C. contactor, relay or switching tube.
The photovoltaic charged method of a kind of all-vanadium flow battery comprises the steps:
S1: start UPS, carry out S2;
S2: power supply unit is powered to controller and electrolyte circulating pump, carries out S3;
S3: controller starts electrolyte circulating pump, carries out S4;
S4: state detector is gathered all-vanadium flow battery voltage and capacity status parameter in real time and is exported to controller, carries out S5;
S5: controller judges that all-vanadium flow battery state parameter value whether less than parameter preset threshold value I, is then to carry out S11, otherwise carries out S6;
S6: controller control gate-controlled switch disconnects, and carries out S7;
S7: controller starts photovoltaic charged device, carries out S8;
S8: the electric energy that photovoltaic charged device transmits solar energy photovoltaic panel carries out being transferred to the all-vanadium flow battery charging by dc bus after the conversion, carries out S9;
S9: controller judges whether all-vanadium flow battery state parameter value equals parameter preset threshold value II, is then to carry out S10, otherwise carries out S8;
S10: controller is regulated all-vanadium flow battery by the output current of controlling photovoltaic charged device and is in floating charge state, carries out S5;
S11: controller control gate-controlled switch closure, carry out S12;
S12: solar energy photovoltaic panel is converted to solar energy electric energy and exports dc bus to by mutual diode in series VD1 and gate-controlled switch, carries out S13;
S13: the electric energy that dc bus transmits solar energy photovoltaic panel is given the all-vanadium flow battery charging, carries out S5.
Owing to adopted technique scheme, the photovoltaic charged system and method for a kind of all-vanadium flow battery provided by the invention, by integrated solar energy photovoltaic panel, photovoltaic charged device and all-vanadium flow battery, utilize control that controller switches on and off gate-controlled switch and the startup of photovoltaic charged device, realized when all-vanadium flow battery state parameter value is lower than parameter preset threshold value I, utilize solar energy photovoltaic panel that all-vanadium flow battery is directly charged, when all-vanadium flow battery voltage during more than or equal to parameter preset threshold value I, utilize photovoltaic charged device that all-vanadium flow battery is charged, power to electrolyte circulating pump and controller when starting in system in conjunction with the power supply unit that comprises UPS simultaneously, can realize being in initial condition or all-vanadium flow battery voltage when low when all-vanadium flow battery, can utilize UPS temporarily to start electrolyte circulating pump and controller, and directly all-vanadium flow battery is charged by solar energy photovoltaic panel, the working power that has solved photovoltaic charged device control components and parts in the photovoltaic charged system of all-vanadium flow battery of prior art utilizes the direct voltage of all-vanadium flow battery output to provide usually, and photovoltaic charged device utilizes the electric energy of solar energy photovoltaic panel output that all-vanadium flow battery is charged, then when being in initial condition or all-vanadium flow battery voltage, all-vanadium flow battery can not start photovoltaic charged device when low, and then can't realize the problem that solar energy charges to all-vanadium flow battery, the output current that the judged result that equals parameter preset threshold value II according to all-vanadium flow battery voltage by controller is controlled photovoltaic charged device is regulated all-vanadium flow battery and is in floating charge state, and then the charging current of regulating all-vanadium flow battery, can effectively protect all-vanadium flow battery and prolong all-vanadium flow battery useful life, the present invention has improved the efficient of solar energy utilization ratio and all-vanadium flow battery, take full advantage of solar energy resources, do not need to assist the photovoltaic charging system by civil power or additional charge power supply, applicability is strong, easy to use, the efficient height, save cost, switch on and off and then realize solar energy photovoltaic panel switching on and off the direct charge path of all-vanadium flow battery by controller control gate-controlled switch, gate-controlled switch can be selected D.C. contactor according to the size of actual current, relay or switching tube, the control mode simple optimizing, it is convenient to realize, the gate-controlled switch series connection is connected to diode VD1 and can prevents effectively that dc bus is to the solar energy photovoltaic panel reverse charge, described power supply unit comprises direct current supply and two kinds of structures of Alternating Current Power Supply, can satisfy the requirement of different controllers and electrolyte circulating pump working power, when power supply unit adopts the direct current supply structure, dc bus connects chopper by diode VD2, rectifier connects chopper by diode VD3, diode VD2 is connected with diode VD3 negative electrode, reverse charge not only can be prevented and feeder ear according to the ingenious switching chopper of height of DC bus-bar voltage and rectifier output voltage can be realized, the alternating current that UPS is transmitted when rectifier carries out rectification and by diode VD3 direct current is transferred to DC converter during greater than DC bus-bar voltage when the rectifier output voltage, when DC bus-bar voltage during greater than the rectifier output voltage dc bus give DC converter by diode VD2 transmission direct current, simple in structure, control is reliable, reduced hardware cost, in addition, the present invention can also comprise and being serially connected in by solar energy photovoltaic panel, diode VD1, current sensor in the charge circuit that gate-controlled switch and dc bus constitute; Described current sensor is connected with controller; The current signal that feeds back to controller when current sensor is during less than certain current threshold, controller control gate-controlled switch disconnects, can realize when overcast and rainy or solar energy hang down, detect photovoltaic electric current that solar energy photovoltaic panel exports hour by current sensor, gate-controlled switch in the controller solar energy photovoltaic panel charge circuit directly disconnects, and stops charging and reduces power consumption; In addition, the present invention can also comprise a plurality of AC load that connect all-vanadium flow battery by inverter; A plurality of described AC load adopt control strategy step by step, controller changes connection and the disconnection of controlling the AC load of different priorities by inverter according to the all-vanadium flow battery state parameter that state detector feeds back to controller, realize when the all-vanadium flow battery state parameter reduces a numerical value, controller disconnects 1 tunnel minimum load of priority by inverter, when the all-vanadium flow battery state parameter reduces a numerical value again, controller disconnects 1 tunnel lower load of priority again by inverter, and then guaranteeing the load power supply that priority is the highest, control is optimized rationally; Further; state detector comprises voltage sensor and SOC measurement module; can realize changing control and switching charge path according to all-vanadium flow battery voltage parameter and capacity parameter; that photovoltaic charged device has is anti-overcharge, the safety protective circuit of anti-overvoltage, anti-overflow, anti-reverse and anti-short circuit; controller has prevented the safety protective circuit put; safe and reliable, be easy to safeguard.
Description of drawings
Fig. 1 is the structured flowchart of the photovoltaic charged system of all-vanadium flow battery of prior art;
Fig. 2 is the structured flowchart of system of the present invention;
Fig. 3, the 4th, the structured flowchart of power supply unit embodiment of the present invention.
Fig. 5 is the flow chart of the method for the invention.
Embodiment
As Fig. 2, Fig. 3 and the photovoltaic charged system of a kind of all-vanadium flow battery shown in Figure 4, comprising: be used for that solar energy is converted to electric energy and export the solar energy photovoltaic panel of dc bus to; Connect solar energy photovoltaic panel, be used for the electric energy that solar energy photovoltaic panel transmits is carried out exporting to after the conversion the photovoltaic charged device of dc bus; Connect solar energy photovoltaic panel, photovoltaic charged device and all-vanadium flow battery respectively, be used for the electric energy that solar energy photovoltaic panel or photovoltaic charged device transmit is transferred to the dc bus of all-vanadium flow battery charging; Described dc bus one is rectified the utmost point and is connected the solar energy photovoltaic panel output plus terminal with gate-controlled switch by mutual diode in series VD1; Described diode VD1 anode connects solar energy photovoltaic panel, and negative electrode connects gate-controlled switch; Connect dc bus, be used for storing the electric energy that dc bus transmits and the all-vanadium flow battery that store electrical energy is released into dc bus; The power supply unit that connects dc bus; Described power supply unit comprises the UPS that gives controller and electrolyte circulating pump power supply when system starts, and this power supply unit connects electrolyte circulating pump and controller respectively; The electrolyte circulating pump that connects all-vanadium flow battery; Connect all-vanadium flow battery, be used for gathering in real time the state detector of the current voltage of all-vanadium flow battery and capacity status parameter; Connect electrolyte circulating pump respectively, state detector, gate-controlled switch, photovoltaic charged device, be used for starting electrolyte circulating pump, control the gate-controlled switch closure according to the all-vanadium flow battery state parameter that state detector is gathered in real time less than the judged result of parameter preset threshold value I, control the gate-controlled switch disconnection and start photovoltaic charged device more than or equal to the judged result of parameter preset threshold value I according to the all-vanadium flow battery state parameter value that state detector is gathered in real time, the judged result that equals parameter preset threshold value II according to the real-time all-vanadium flow battery state parameter value of gathering of state detector is regulated the controller that all-vanadium flow battery is in floating charge state by the output current of controlling photovoltaic charged device; As preferably, described power supply unit also comprises: rectifier, diode VD2, diode VD3 and chopper; Described rectifier input connects UPS; Described diode VD3 anode connects the rectifier output plus terminal; Described diode VD2 anode connects dc bus other end positive pole; Described diode VD2 negative electrode, diode VD3 negative electrode are connected with chopper input anode; Described chopper output connects electrolyte circulating pump and controller respectively; As preferably, described power supply unit also comprises: diode VD4 and DC/AC converter; Described diode VD4 anode connects dc bus other end positive pole; Described diode VD4 negative electrode connects DC/AC converter input anode; Described DC/AC converter output terminal connects electrolyte circulating pump and controller respectively; As preferably, also comprise the current sensor that is serially connected in the charge circuit that is constituted by solar energy photovoltaic panel, diode VD1, gate-controlled switch and dc bus; Described current sensor is connected with controller; The current signal that feeds back to controller when current sensor is during less than certain current threshold, and controller control gate-controlled switch disconnects; Also comprise a plurality of AC load that connect all-vanadium flow battery by inverter; A plurality of described AC load adopt control strategy step by step, and controller changes connection and the disconnection of controlling the AC load of different priorities by inverter according to the all-vanadium flow battery state parameter that state detector feeds back to controller; Described state detector comprises voltage sensor and SOC measurement module; As preferably, the safety protective circuit of anti-overcharge, anti-overvoltage that described photovoltaic charged device has, anti-overflow, anti-reverse and anti-short circuit; Described controller has prevented the safety protective circuit put; As preferably, also comprise the power consumption equipment and the DC load (not shown) that connect dc bus; Described power consumption equipment is connected with dc bus by hand switch; As preferably, described gate-controlled switch is D.C. contactor, relay or switching tube.
The photovoltaic charged method of a kind of all-vanadium flow battery as shown in Figure 5 comprises the steps:
S1: start UPS, carry out S2;
S2: power supply unit is powered to controller and electrolyte circulating pump, carries out S3;
S3: controller starts electrolyte circulating pump, carries out S4;
S4: state detector is gathered all-vanadium flow battery voltage and capacity status parameter in real time and is exported to controller, carries out S5;
S5: controller judges that all-vanadium flow battery state parameter value whether less than parameter preset threshold value I, is then to carry out S11, otherwise carries out S6;
S6: controller control gate-controlled switch disconnects, and carries out S7;
S7: controller starts photovoltaic charged device, carries out S8;
S8: the electric energy that photovoltaic charged device transmits solar energy photovoltaic panel carries out being transferred to the all-vanadium flow battery charging by dc bus after the conversion, carries out S9;
S9: controller judges whether all-vanadium flow battery state parameter value equals parameter preset threshold value II, is then to carry out S10, otherwise carries out S8;
S10: controller is regulated all-vanadium flow battery by the output current of controlling photovoltaic charged device and is in floating charge state, carries out S5;
S11: controller control gate-controlled switch closure, carry out S12;
S12: solar energy photovoltaic panel is converted to solar energy electric energy and exports dc bus to by mutual diode in series VD1 and gate-controlled switch, carries out S13;
S13: the electric energy that dc bus transmits solar energy photovoltaic panel is given the all-vanadium flow battery charging, carries out S5.
The course of work of the present invention is as follows: at first start UPS, because controller and electrolyte circulating pump power consumption are less, therefore need the power of UPS and capacity all very little, power supply unit is powered to controller and electrolyte circulating pump, when power supply unit adopts as shown in Figure 3 direct current supply structure, rectifier carries out rectification to the alternating current that UPS transmits, if this moment, all-vanadium flow battery was in initial condition or its voltage when very low, and the rectifier output voltage is greater than DC bus-bar voltage, then rectifier is powered to chopper by the diode VD3 of its output plus terminal serial connection, if all-vanadium flow battery had certain voltage and exported dc bus to this moment, and DC bus-bar voltage is higher than the rectifier output voltage, then the dc bus other end is powered to chopper by the diode VD2 of its anodal serial connection, controller and electrolyte circulating pump were given in power supply after chopper was finished the DC-DC conversion, when power supply unit adopts as shown in Figure 4 Alternating Current Power Supply structure, when if DC bus-bar voltage is low, directly power by UPS, then by the DC/AC converter DC bus-bar voltage is carried out the orthogonal conversion and power to controller and electrolyte circulating pump if DC bus-bar voltage is higher, controller starts electrolyte circulating pump, make the circulate electrolyte of all-vanadium flow battery self, state detector is gathered all-vanadium flow battery voltage and capacity status parameter in real time and is transferred to controller, when all-vanadium flow battery state parameter value during more than or equal to parameter preset threshold value I, controller directly starts photovoltaic charged device, and the electric energy that photovoltaic charged device transmits solar energy photovoltaic panel carries out being transferred to the all-vanadium flow battery charging by dc bus after the conversion; When all-vanadium flow battery state parameter value during less than parameter preset threshold value I, controller control gate-controlled switch closure, usually get the work starting resistor that parameter preset threshold value I is photovoltaic charged device, be generally 0.8～1.1 times of all-vanadium flow battery rated voltage, after the gate-controlled switch closure, the direct charge path of solar energy photovoltaic panel is connected, solar energy photovoltaic panel is converted to solar energy electric energy and exports electric energy to dc bus by mutual diode in series VD1 and gate-controlled switch, the electric energy that dc bus transmits solar energy photovoltaic panel is given the all-vanadium flow battery charging, along with the continuous store electrical energy of all-vanadium flow battery, when all-vanadium flow battery voltage during more than or equal to parameter preset threshold value I, and then control the gate-controlled switch disconnection and start photovoltaic charged device, the electric energy that photovoltaic charged device transmits solar energy photovoltaic panel carry out after the conversion being transferred to the all-vanadium flow battery charging by dc bus and when all-vanadium flow battery state parameter value reaches parameter preset threshold value II the adjusting all-vanadium flow battery be in floating charge state, state parameter when usually parameter preset threshold value II is generally got all-vanadium flow battery voltage and is full of, the photovoltaic charged system and method for a kind of all-vanadium flow battery provided by the invention, by integrated solar energy photovoltaic panel, photovoltaic charged device and all-vanadium flow battery, utilize control that controller switches on and off gate-controlled switch and the startup of photovoltaic charged device, realized when all-vanadium flow battery state parameter value is lower than parameter preset threshold value I, utilize solar energy photovoltaic panel that all-vanadium flow battery is directly charged, when all-vanadium flow battery voltage during more than or equal to parameter preset threshold value I, utilize photovoltaic charged device that all-vanadium flow battery is charged, power to electrolyte circulating pump and controller when starting in system in conjunction with the power supply unit that comprises UPS simultaneously, can realize being in initial condition or all-vanadium flow battery voltage when low when all-vanadium flow battery, can utilize UPS temporarily to start electrolyte circulating pump and controller, and directly all-vanadium flow battery is charged by solar energy photovoltaic panel, the working power that has solved photovoltaic charged device control components and parts in the photovoltaic charged system of all-vanadium flow battery of prior art utilizes the direct voltage of all-vanadium flow battery output to provide usually, and photovoltaic charged device utilizes the electric energy of solar energy photovoltaic panel output that all-vanadium flow battery is charged, then when being in initial condition or all-vanadium flow battery voltage, all-vanadium flow battery can not start photovoltaic charged device when low, and then can't realize the problem that solar energy charges to all-vanadium flow battery, the output current that the judged result that equals parameter preset threshold value II according to all-vanadium flow battery voltage by controller is controlled photovoltaic charged device is regulated all-vanadium flow battery and is in floating charge state, and then the charging current of regulating all-vanadium flow battery, can effectively protect all-vanadium flow battery and prolong all-vanadium flow battery useful life, the present invention has improved the efficient of solar energy utilization ratio and all-vanadium flow battery, take full advantage of solar energy resources, do not need to assist the photovoltaic charging system by civil power or additional charge power supply, applicability is strong, easy to use, the efficient height, save cost, switch on and off and then realize solar energy photovoltaic panel switching on and off the direct charge path of all-vanadium flow battery by controller control gate-controlled switch, gate-controlled switch can be selected D.C. contactor according to the size of actual current, relay or switching tube, the control mode simple optimizing, it is convenient to realize, the gate-controlled switch series connection is connected to diode VD1 and can prevents effectively that dc bus is to the solar energy photovoltaic panel reverse charge, described power supply unit comprises direct current supply and two kinds of structures of Alternating Current Power Supply, can satisfy the requirement of different controllers and electrolyte circulating pump working power, when power supply unit adopts the direct current supply structure, dc bus connects chopper by diode VD2, rectifier connects chopper by diode VD3, diode VD2 is connected with diode VD3 negative electrode, reverse charge not only can be prevented and feeder ear according to the ingenious switching chopper of height of DC bus-bar voltage and rectifier output voltage can be realized, the alternating current that UPS is transmitted when rectifier carries out rectification and by diode VD3 direct current is transferred to DC converter during greater than DC bus-bar voltage when the rectifier output voltage, when DC bus-bar voltage during greater than the rectifier output voltage dc bus give DC converter by diode VD2 transmission direct current, simple in structure, control is reliable, reduced hardware cost, as preferably, the present invention can also comprise and being serially connected in by solar energy photovoltaic panel, diode VD1, current sensor in the charge circuit that gate-controlled switch and dc bus constitute; Described current sensor is connected with controller; The current signal that feeds back to controller when current sensor is during less than certain current threshold, common current threshold span is 0.1 times of all-vanadium flow battery rated current, controller control gate-controlled switch disconnects, can realize when overcast and rainy or solar energy hang down, detect photovoltaic electric current that solar energy photovoltaic panel exports hour by current sensor, gate-controlled switch in the controller solar energy photovoltaic panel charge circuit directly disconnects, and stops charging and reduces power consumption; As preferably, the present invention can also comprise a plurality of AC load that connect all-vanadium flow battery by inverter; A plurality of described AC load adopt control strategy step by step, controller changes connection and the disconnection of controlling the AC load of different priorities by inverter according to the all-vanadium flow battery state parameter that state detector feeds back to controller, realize when the all-vanadium flow battery state parameter reduces a numerical value, controller disconnects 1 tunnel minimum load of priority by inverter, when the all-vanadium flow battery state parameter reduces a numerical value again, controller disconnects 1 tunnel lower load of priority again by inverter, and then guaranteeing the load power supply that priority is the highest, control is optimized rationally; Further; state detector comprises voltage sensor and SOC measurement module; can realize changing control and switching charge path according to all-vanadium flow battery voltage parameter and capacity parameter; that photovoltaic charged device has is anti-overcharge, the safety protective circuit of anti-overvoltage, anti-overflow, anti-reverse and anti-short circuit; controller has prevented the safety protective circuit put; safe and reliable, be easy to safeguard.
The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (10)
1. photovoltaic charged system of all-vanadium flow battery is characterized in that comprising:
Be used for that solar energy is converted to electric energy and export the solar energy photovoltaic panel of dc bus to;
Connect solar energy photovoltaic panel, be used for the electric energy that solar energy photovoltaic panel transmits is carried out exporting to after the conversion the photovoltaic charged device of dc bus;
Connect solar energy photovoltaic panel, photovoltaic charged device and all-vanadium flow battery respectively, be used for the electric energy that solar energy photovoltaic panel or photovoltaic charged device transmit is transferred to the dc bus of all-vanadium flow battery charging; Described dc bus one is rectified the utmost point and is connected the solar energy photovoltaic panel output plus terminal with gate-controlled switch by mutual diode in series VD1; Described diode VD1 anode connects solar energy photovoltaic panel, and negative electrode connects gate-controlled switch;
Connect dc bus, be used for storing the electric energy that dc bus transmits and the all-vanadium flow battery that store electrical energy is released into dc bus;
The power supply unit that connects dc bus; Described power supply unit comprises the UPS that gives controller and electrolyte circulating pump power supply when system starts, and this power supply unit connects electrolyte circulating pump and controller respectively;
The electrolyte circulating pump that connects all-vanadium flow battery;
Connect all-vanadium flow battery, be used for gathering in real time the state detector of the current voltage of all-vanadium flow battery and capacity status parameter;
Connect electrolyte circulating pump respectively, state detector, gate-controlled switch, photovoltaic charged device, be used for starting electrolyte circulating pump, control the gate-controlled switch closure according to the all-vanadium flow battery state parameter that state detector is gathered in real time less than the judged result of parameter preset threshold value I, control the gate-controlled switch disconnection and start photovoltaic charged device more than or equal to the judged result of parameter preset threshold value I according to the all-vanadium flow battery state parameter value that state detector is gathered in real time, the judged result that equals parameter preset threshold value II according to the real-time all-vanadium flow battery state parameter value of gathering of state detector is regulated the controller that all-vanadium flow battery is in floating charge state by the output current of controlling photovoltaic charged device.
2. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that described power supply unit also comprises: rectifier, diode VD2, diode VD3 and chopper; Described rectifier input connects UPS; Described diode VD3 anode connects the rectifier output plus terminal; Described diode VD2 anode connects dc bus other end positive pole; Described diode VD2 negative electrode, diode VD3 negative electrode are connected with chopper input anode; Described chopper output connects electrolyte circulating pump and controller respectively.
3. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that described power supply unit also comprises: diode VD4 and DC/AC converter; Described diode VD4 anode connects dc bus other end positive pole; Described diode VD4 negative electrode connects DC/AC converter input anode; Described DC/AC converter output terminal connects electrolyte circulating pump and controller respectively.
4. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that also comprising the current sensor that is serially connected in the charge circuit that is made of solar energy photovoltaic panel, diode VD1, gate-controlled switch and dc bus; Described current sensor is connected with controller; The current signal that feeds back to controller when current sensor is during less than certain current threshold, and controller control gate-controlled switch disconnects.
5. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that also comprising a plurality of AC load that connect all-vanadium flow battery by inverter; A plurality of described AC load adopt control strategy step by step, and controller changes connection and the disconnection of controlling the AC load of different priorities by inverter according to the all-vanadium flow battery state parameter that state detector feeds back to controller.
6. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that described state detector comprises voltage sensor and SOC measurement module.
7. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that described photovoltaic charged device has the safety protective circuit of anti-overcharge, anti-overvoltage, anti-overflow, anti-reverse and anti-short circuit; Described controller has prevented the safety protective circuit put.
8. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that also comprising the power consumption equipment and the DC load that connect dc bus; Described power consumption equipment is connected with dc bus by hand switch.
9. the photovoltaic charged system of a kind of all-vanadium flow battery according to claim 1 is characterized in that described gate-controlled switch is D.C. contactor, relay or switching tube.
10. the photovoltaic charged method of all-vanadium flow battery is characterized in that comprising the steps:
S1: start UPS, carry out S2;
S2: power supply unit is powered to controller and electrolyte circulating pump, carries out S3;
S3: controller starts electrolyte circulating pump, carries out S4;
S4: state detector is gathered all-vanadium flow battery voltage and capacity status parameter in real time and is exported to controller, carries out S5;
S5: controller judges that all-vanadium flow battery state parameter value whether less than parameter preset threshold value I, is then to carry out S11, otherwise carries out S6;
S6: controller control gate-controlled switch disconnects, and carries out S7;
S7: controller starts photovoltaic charged device, carries out S8;
S8: the electric energy that photovoltaic charged device transmits solar energy photovoltaic panel carries out being transferred to the all-vanadium flow battery charging by dc bus after the conversion, carries out S9;
S9: controller judges whether all-vanadium flow battery state parameter value equals parameter preset threshold value II, is then to carry out S10, otherwise carries out S8;
S10: controller is regulated all-vanadium flow battery by the output current of controlling photovoltaic charged device and is in floating charge state, carries out S5;
S11: controller control gate-controlled switch closure, carry out S12;
S12: solar energy photovoltaic panel is converted to solar energy electric energy and exports dc bus to by mutual diode in series VD1 and gate-controlled switch, carries out S13;
S13: the electric energy that dc bus transmits solar energy photovoltaic panel is given the all-vanadium flow battery charging, carries out S5.
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Effective date of registration: 20171206 Address after: Thirty Lingang Industrial Zone, 116103 Li Pu new district, Liaoning, Dalian Patentee after: Dalian Raycom energy storage equipment Co. Ltd. Address before: Hi Tech Park XinDa street Dalian city Liaoning province 116025 No. 22 Patentee before: Dalian Rongke Power Co., Ltd. |