CN108075490A - A kind of energy saver and method for transformer in solar power plant - Google Patents
A kind of energy saver and method for transformer in solar power plant Download PDFInfo
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- CN108075490A CN108075490A CN201711325479.6A CN201711325479A CN108075490A CN 108075490 A CN108075490 A CN 108075490A CN 201711325479 A CN201711325479 A CN 201711325479A CN 108075490 A CN108075490 A CN 108075490A
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- 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
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Abstract
The invention discloses a kind of energy savers and method for transformer in solar power plant, add converter circuit, control unit, transformer circuit, secondary on-off circuit, main switch circuit, converter circuit, it receives given alternating voltage instruction and generates alternating current, the exciting current for providing low pressure carries out excitation to unloaded high-tension transformer；Control unit instructs to converter circuit for exporting given alternating voltage, and controls the opening and closing of time on-off circuit, main switch circuit；Transformer circuit, for the exciting current of the low pressure of converter circuit to be boosted, realize stream to unloaded high-tension transformer excitation, it can be good at meeting photovoltaic generation and exit high-tension transformer at night, it saves energy consumption and reduces electricity charge expense, while high-tension transformer is put into time without reducing reliability and equipment life before power generation, be skillfully constructed, it is convenient to realize, has a good application prospect.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, and in particular to it is a kind of in solar power plant transformer it is energy saving
Device and method.
Background technology
With the fast development of new energy science and technology, solar power generation is used widely and fast development, solar grid-connected
Electricity generation system, major way are to pass through step-up power transformers（Such as box-type substation）By photovoltaic grid-connected inversion in photovoltaic module
The electric energy of device output is sent into power grid（The voltage class of China is typically 10kV or 35kV）, it is currently practical on do not account at night
Stop the energy waste problem of the unloaded energy consumption of these power transformers during power generation.
Solar grid-connected electricity generation system can collect solar radiant energy, generally pass through photovoltaic module using photovoltaic effect
Solar radiant energy is converted into direct current energy, direct current energy is changed into AC energy by photovoltaic combining inverter and inputs liter
The low-pressure side of piezoelectric forces transformer, the high-pressure side of high-tension transformer connect collection electric line by " T " and are sent by it to switchgear, switch
Cabinet accesses the high voltage bus of switchgear house, and in power generation, electric energy is sent into power grid like this.
When stopping generating electricity（Typically night）, step-up power transformers are run under light condition, power grid electric energy
Step-up power transformers are sent by high voltage bus, switchgear, collection electric line, at this moment step-up power transformers are as load consumption electricity
Energy.For example, certain photovoltaic power station uses 5 10kV voltage class Split type dry-type transformers（SCFB10-1000/500/
500kVA）" T " connects the high voltage bus that collection electric line is sent into switchgear house, and the no-load loss power of every transformer is about 1.74kW,
Summer stops length during power generation, and when being about 11 small, the no-load loss 19.14kWh of every transformer often spends electricity with big commercial power
Take 0.64 yuan of calculating, daily to pay 12.25 yuan of the electricity charge, the electricity charge that the night of annual this kind of transformer generates will be more than 4470 yuan.
Transformer is exited at night can save energy consumption and reduce electricity charge expense, and still, transformer is in idle-loaded switching-on, meeting
There is excitation surge current, be actually unable in exiting and put into realization simply by transformer.The excitation surge current of transformer is transformation
The transient current that device full voltage generates when being powered in its winding, the residual flux before transformer is put into iron core are thrown with transformer
When the flow direction that fashionable operating voltage generates is identical, therefore total magnetic flux, can be produced considerably beyond the saturation magnetic flux of iron core
It is raw it is larger shoves, wherein peak-peak can reach 6-8 times of transformer rated current.
The phase angle of system voltage, the residual flux of transformer core and power-supply system hinder when excitation surge current is put into transformer
The factors such as anti-are related, and maximum excitation surge current occurs, moment of the voltage through zero crossing when transformer is put into（This when magnetic flux be peak
Value）, excitation surge current can cause electro-mechanical wave in some cases, if do not taken corresponding measure, may cause transformer overcurrent or
Protective relaying maloperation is made, and causes to power off, and influences other users use.In addition, high-tension transformer does idle-loaded switching-on operation production daily
Raw excitation surge current brings voltage current impact, thermal shock, electromagnetic action, can cause mechanical force and the vibration of inside transformer,
And then shorten its service life.
Transformer can be exited at night to meet photovoltaic generation, to save energy consumption and to reduce electricity charge expense, meanwhile,
The transformer is put into before power generation in time, and does not reduce reliability and equipment life, is the current technical issues that need to address.
The content of the invention
The purpose of the present invention is overcome how to realize that photovoltaic generation exits transformer at night, save energy consumption and reduce the electricity charge
While expense, the problem of not reducing reliability and equipment life.The section for transformer in solar power plant of the present invention
Energy device and method, converter circuit can receive given alternating voltage instruction and generate alternating current, for providing the excitation of low pressure
Electric current carries out excitation to unloaded high-tension transformer；Control unit is instructed for exporting given alternating voltage to converter circuit, and
The opening and closing of control time on-off circuit, main switch circuit；Transformer circuit, for by the exciting current of the low pressure of converter circuit into
Row boosting realizes stream to unloaded high-tension transformer excitation, can be good at meeting photovoltaic generation and exits high-tension transformer at night,
It saves energy consumption and reduces electricity charge expense, while high-tension transformer is put into time without reducing reliability and equipment longevity before power generation
Life, is skillfully constructed, and it is convenient to realize, has a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of energy saver for transformer in solar power plant, including converter circuit, control unit, transformer electricity
Road, secondary on-off circuit, main switch circuit and high-tension transformer,
The high-tension transformer, the low-voltage alternating-current electric boost for gird-connected inverter in solar power plant to be generated are handed over for high pressure
Galvanic electricity, and pass through main switch circuit and send grid-connected high-pressure system, the grid-connected high-pressure system, for it will boost after to
High-voltage alternating be electrically accessed power grid；
The converter circuit receives given alternating voltage instruction and generates alternating current, for providing the exciting current of low pressure to sky
It carries high-tension transformer and carries out excitation；
Described control unit instructs to converter circuit for exporting given alternating voltage, and controls time on-off circuit, main switch
The opening and closing of circuit；
The transformer circuit for the exciting current of the low pressure of converter circuit to be boosted, realizes stream to unloaded high pressure
Static exciter；
The secondary on-off circuit, for controlling the electrical connection between transformer circuit, high-tension transformer；
Described control unit is connected respectively with converter circuit, secondary on-off circuit, main switch circuit, the converter circuit according to
It is secondary to be connected by transformer circuit, secondary on-off circuit with high-tension transformer, the high-tension transformer by main switch circuit with
Grid-connected high-pressure system is connected.
A kind of foregoing energy saver for transformer in solar power plant, further includes power circuit, the power supply
The power input outside electric power network of circuit, for being opened to converter circuit, control unit, transformer circuit, secondary on-off circuit, master
Powered-down road provides working power.
A kind of foregoing energy saver for transformer in solar power plant, the converter circuit include high-power
IGBT module, protection circuit, drive control circuit, for the alternating current for providing transformer circuit, be transformed into frequency, phase and
The controllable three-phase alternating current of amplitude, the output voltage of converter circuit are consistent with the input terminal voltage of transformer circuit.
A kind of foregoing energy saver for transformer in solar power plant, the converter circuit are adjustable voltage
Source, control unit are the industrial computer that microprocessor is core.
A kind of foregoing energy saver for transformer in solar power plant, the transformer circuit are dry type transformation
Device.
A kind of foregoing energy saver for transformer in solar power plant, the secondary on-off circuit for 10kV or
35kV contactors, breaker or electric isolating switch, main switch circuit for 10kV or 35kV electric isolating switch, contactor or
Breaker.
A kind of power-economizing method for transformer in solar power plant comprises the following steps,
Step（A）, in solar power plant normal power generation on daytime, by control unit time on-off circuit is controlled to be closed, control
Main switch circuit maintains off-state, checks whether the energy saver state for being used for transformer in solar power plant is normal, if
Normally, then it is transferred to step B；Otherwise, control module carries out exception or fault alarm；
Step（B）, watt level and the direction of main switch circuit are flowed through by control unit monitoring, is judged whether in power generation fortune
If row state in solar power generation operating status, persistently detects, generator operation state is not at until detecting；If no
In solar power generation operating status, judge whether the sun has landed, if landing, perform step（C）；If not landing, control
Unit carries out exception or fault alarm；
Step（C）, main switch circuit is disconnected by control unit, is cut off between grid-connected high-pressure system and high-tension transformer
Land the moment for the sun at the time of being electrically connected, and record at this time, obtain the sun next time and rise the moment；
Step（D）, when the sun rises the moment and reaches, grid-connected high-pressure system and main switch circuit are gathered by control unit
The voltage signal of junction is sent to converter circuit as control instruction, and converter circuit starts and adjusted according to control instruction
Its output voltage, which is started from scratch, to be stepped up, it is final so that transformer circuit output voltage amplitude and waveform with it is grid-connected
The voltage signal of high-pressure system and main switch circuit junction ensures consistent；
Step（E）, by control unit main switch circuit is controlled to be closed, converter circuit is shut down, secondary on-off circuit disconnects, photovoltaic
Grid-connected high-pressure system is supplied by main switch circuit and high-tension transformer electrically conducting, high-tension transformer by grid-connected high-pressure system
Electricity, the low-voltage AC that solar power plant generates are High Level AC Voltage by high-tension transformer boosting, pass through main switch circuit
Grid-connected high-pressure system access power grid is sent to, repeats step（A）.
It is previously described for the power-economizing method of transformer in solar power plant, step（B）, judge the current sun whether
Landing can be judged by manually observing judgement or lighting apparatus.
The beneficial effects of the invention are as follows：The energy saver and method for transformer in solar power plant of the present invention,
Add converter circuit, control unit, transformer circuit, secondary on-off circuit, main switch circuit, converter circuit, receive to
Determine alternating voltage instruction and generate alternating current, the exciting current for providing low pressure carries out excitation to unloaded high-tension transformer；Control
Unit instructs to converter circuit for exporting given alternating voltage, and controls the opening and closing of time on-off circuit, main switch circuit；
Transformer circuit for the exciting current of the low pressure of converter circuit to be boosted, realizes that stream encourages unloaded high-tension transformer
Magnetic can be good at meeting photovoltaic generation and high-tension transformer exited at night, and saving energy consumption simultaneously reduces electricity charge expense, while is sending out
High-tension transformer is put into before electricity in time without reducing reliability and equipment life, is skillfully constructed, it is convenient to realize, has good answer
Use prospect.
Description of the drawings
Fig. 1 is the system block diagram for the energy saver of transformer in solar power plant of the present invention.
Specific embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, the energy saver for transformer in solar power plant of the present invention, including converter circuit 2,
Control unit 3, transformer circuit 4, secondary on-off circuit 5, main switch circuit 7 and high-tension transformer 8,
The high-tension transformer 8, the low-voltage alternating-current electric boost for gird-connected inverter in solar power plant to be generated are high pressure
Alternating current, and pass through main switch circuit 7 and send grid-connected high-pressure system 6, the grid-connected high-pressure system 6, for inciting somebody to action to
High-voltage alternating after boosting is electrically accessed power grid, and high-tension transformer 8 can be an either more parallel connections；
The converter circuit 2 receives given alternating voltage instruction and generates alternating current, for providing the exciting current of low pressure to sky
It carries high-tension transformer 8 and carries out excitation；
Described control unit 3 is instructed for exporting given alternating voltage to converter circuit 2, and controls time on-off circuit 5, master
The opening and closing of on-off circuit 7；
The transformer circuit 4 for the exciting current of the low pressure of converter circuit 2 to be boosted, realizes stream to unloaded high
8 excitation of pressure transformer；
The secondary on-off circuit 5, for controlling the electrical connection between transformer circuit 4, high-tension transformer 8；
Described control unit 3 is connected respectively with converter circuit 2, secondary on-off circuit 5, main switch circuit 7, the current transformer electricity
Road 2 passes sequentially through transformer circuit 4, secondary on-off circuit 5 is connected with high-tension transformer 8, and the high-tension transformer 8 is opened by master
Powered-down road 7 is connected with grid-connected high-pressure system 6.
Preferably, power circuit 1, the power input outside electric power network of the power circuit 1, for current transformer are further included
Circuit 2, control unit 3, transformer circuit 4, secondary on-off circuit 5, main switch circuit 7 provide working power.
Preferably, the converter circuit 2 includes high-power IGBT module, protection circuit, drive control circuit, for inciting somebody to action
The alternating current that transformer circuit 4 provides, is transformed into the controllable three-phase alternating current of frequency, phase and amplitude, converter circuit 2 it is defeated
It is consistent with the input terminal voltage of transformer circuit 4 to go out voltage, control unit 3 is realized by microprocessor integrated circuit, and acquisition photovoltaic is simultaneously
The voltage signal of 8 switch-side of net high-pressure system 6 and high-tension transformer, while main switch, the status signal of secondary switch are gathered, and root
According to control instruction, pressure regulation and FM signal are sent, progressively to adjust the output voltage of converter circuit 2 and frequency, makes high voltage variable
The voltage and frequency of 8 switch-side of depressor are consistent with the voltage and frequency of grid-connected high-pressure system 6, possess the item of simultaneous interconnecting
Part, and control signal is sent, main switch circuit 7 is closed, realizes simultaneous interconnecting, transformer circuit 4 is made of dry-type transformer,
Input side voltage is consistent with 2 voltage of current transformer, and outlet side voltage is consistent with 8 voltage of high-tension transformer, and capacity meets high pressure transformation
Device 8 is unloaded and leaves allowance, and secondary on-off circuit 5 uses existing high voltage load switch, voltage class and 8 system of high-tension transformer
Voltage is consistent, and main switch circuit 7 uses existing vacuum circuit breaker, and voltage class is consistent with 8 system voltage of high-tension transformer.
Preferably, the converter circuit 2 is variable voltage source, and control unit 3 is the industry calculating that microprocessor is core
Machine, transformer circuit 4 are dry-type transformer, and secondary on-off circuit 5 is 10kV or 35kV contactors（Or breaker or electronic keep apart
It closes）, main switch circuit 7 is 10kV or 35kV electric isolating switch（Or contactor or breaker）.
The power-economizing method for transformer in solar power plant of the present invention, comprises the following steps,
Step（A）, in solar power plant normal power generation on daytime, by control unit 3 time on-off circuit 5 is controlled to be closed, controlled
Main switch circuit 7 processed maintains off-state, checks whether the energy saver state for being used for transformer in solar power plant is normal,
If normal, step B is transferred to；Otherwise, control module 3 carries out exception or fault alarm；
Step（B）, watt level and the direction for flowing through main switch circuit 7 are monitored by control unit 3, is judged whether in power generation
If operating status in solar power generation operating status, persistently detects, generator operation state is not at until detecting；If
Solar power generation operating status is not at, judges whether the sun has landed, if landing, performs step（C）；If not landing, control
Unit 3 processed carries out exception or fault alarm, it is preferred that judge whether the current sun has landed, it can be by manually observing judgement
Or lighting apparatus judges；
Step（C）, main switch circuit 7 is disconnected by control unit 3, cut off grid-connected high-pressure system 6 and high-tension transformer 8 it
Between electrical connection, and record at this time at the time of for the sun land the moment, obtain next time the sun rise the moment；
Step（D）, when the sun rises the moment and reaches, grid-connected high-pressure system 6 and main switch electricity are gathered by control unit 3
The voltage signal of 7 junction of road is sent to converter circuit 2 as control instruction, and converter circuit 2 starts and referred to according to control
Order adjusts its output voltage and starts from scratch and is stepped up, it is final so that 4 output voltage of transformer circuit amplitude and waveform with
The voltage signal of grid-connected high-pressure system 6 and 7 junction of main switch circuit ensure it is consistent, so as to which converter circuit 2 is as can
Power supply is adjusted to provide exciting current, excitation is carried out to unloaded high-tension transformer 8, unloaded high-tension transformer voltage is stepped up, until reaching
Horizontal to rated operational voltage, this step avoids the excitation surge current for directly applying operating voltage in no-load transformer and generating and asks
Topic realizes the safe and reliable long life requirement of the unloaded input of high-tension transformer；
Step（E）, by control unit 3 main switch circuit 7 is controlled to be closed, converter circuit 2 is shut down, secondary on-off circuit 5 disconnects,
Grid-connected high-pressure system 6 is by main switch circuit 7 and 8 electrically conducting of high-tension transformer, and high-tension transformer 8 is by grid-connected height
Pressure system 6 is powered, and the low-voltage AC that solar power plant generates is High Level AC Voltage by the boosting of high-tension transformer 8, is passed through
Main switch circuit 7 is sent to grid-connected high-pressure system 6 and accesses power grid, repeats step（A）.
Basic principle, the main features and advantages of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe the originals of the present invention
Reason, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (8)
1. a kind of energy saver for transformer in solar power plant, it is characterised in that：Including converter circuit（2）, control
Unit processed（3）, transformer circuit（4）, secondary on-off circuit（5）, main switch circuit（7）And high-tension transformer（8）,
The high-tension transformer（8）, the low-voltage alternating-current electric boost for gird-connected inverter in solar power plant to be generated is height
Alternating current is pressed, and passes through main switch circuit（7）Send grid-connected high-pressure system to（6）, the grid-connected high-pressure system
（6）, for the high-voltage alternating after boosting to be electrically accessed power grid；
The converter circuit（2）, receive given alternating voltage instruction and generate alternating current, for providing the exciting current pair of low pressure
Unloaded high-tension transformer（8）Carry out excitation；
Described control unit（3）, instructed for exporting given alternating voltage to converter circuit（2）, and control time on-off circuit
（5）, main switch circuit（7）Opening and closing；
The transformer circuit（4）, for by converter circuit（2）The exciting current of low pressure boost, realize pair and its
The unloaded high-tension transformer of connection（8）Excitation；
The secondary on-off circuit（5）, for controlling transformer circuit（4）, high-tension transformer（8）Between electrical connection；
Described control unit（3）Respectively with converter circuit（2）, secondary on-off circuit（5）, main switch circuit（7）It is connected, it is described
Converter circuit（2）Pass sequentially through transformer circuit（4）, secondary on-off circuit（5）With high-tension transformer（8）It is connected, the height
Pressure transformer（8）Pass through main switch circuit（7）With grid-connected high-pressure system（6）It is connected.
2. a kind of energy saver for transformer in solar power plant according to claim 1, it is characterised in that：Also
Including power circuit（1）, the power circuit（1）Power input outside electric power network, for converter circuit（2）, control
Unit（3）, transformer circuit（4）, secondary on-off circuit（5）, main switch circuit（7）Working power is provided.
3. a kind of energy saver for transformer in solar power plant according to claim 1, it is characterised in that：Institute
State converter circuit（2）Including high-power IGBT module, protection circuit, drive control circuit, for by transformer circuit（4）It carries
The alternating current of confession is transformed into the controllable three-phase alternating current of frequency, phase and amplitude, converter circuit（2）Output voltage and change
Transformer circuits（4）Input terminal voltage it is consistent.
4. a kind of energy saver for transformer in solar power plant according to claim 1, it is characterised in that：Institute
State converter circuit（2）For variable voltage source, control unit（3）For the industrial computer that microprocessor is core.
5. a kind of energy saver for transformer in solar power plant according to claim 1, it is characterised in that：Institute
State transformer circuit（4）For dry-type transformer.
6. a kind of energy saver for transformer in solar power plant according to claim 1, it is characterised in that：Institute
State time on-off circuit（5）For 10kV or 35kV contactors, breaker or electric isolating switch, main switch circuit（7）For 10kV or
35kV electric isolating switch, contactor or breaker.
7. a kind of power-economizing method for transformer in solar power plant, it is characterised in that：Comprise the following steps,
Step（A）, in solar power plant normal power generation on daytime, pass through control unit（3）Control time on-off circuit（5）It closes
It closes, controls main switch circuit（7）Off-state is maintained, checks that the energy saver state for transformer in solar power plant is
It is no normal, if normally, being transferred to step（B）；Otherwise, control module（3）Carry out exception or fault alarm；
Step（B）, pass through control unit（3）Monitoring flows through main switch circuit（7）Watt level and direction, judge whether to be in
If generator operation state in solar power generation operating status, persistently detects, generator operation shape is not at until detecting
State；If being not at solar power generation operating status, judge whether the sun has landed, if landing, perform step（C）；If it does not drop
Fall, control unit（3）Carry out exception or fault alarm；
Step（C）, pass through control unit（3）Disconnect main switch circuit（7）, cut off grid-connected high-pressure system（6）With high voltage variable
Depressor（8）Between electrical connection, and record at this time at the time of for the sun land the moment, obtain next time the sun rise the moment；
Step（D）, when the sun rises the moment and reaches, pass through control unit（3）Gather grid-connected high-pressure system（6）It is opened with master
Powered-down road（7）The voltage signal of junction is sent to converter circuit as control instruction（2）, converter circuit（2）Start simultaneously
Its output voltage is adjusted according to control instruction start from scratch and be stepped up, finally so that transformer circuit（4）Output voltage
Amplitude and waveform and grid-connected high-pressure system（6）With main switch circuit（7）The voltage signal of junction ensures consistent；
Step（E）, pass through control unit（3）Control main switch circuit（7）It is closed, converter circuit（2）It shuts down, secondary on-off circuit
（5）It disconnects, grid-connected high-pressure system（6）Pass through main switch circuit（7）With high-tension transformer（8）Electrically conducting, high pressure transformation
Device（8）By grid-connected high-pressure system（6）Power supply, the low-voltage AC that solar power plant generates pass through high-tension transformer（8）
It boosts as High Level AC Voltage, passes through main switch circuit（7）It is sent to grid-connected high-pressure system（6）Power grid is accessed, repeats step
（A）.
8. the power-economizing method according to claim 7 for transformer in solar power plant, it is characterised in that：Step
（B）, judge whether the current sun has landed, can be judged by manually observing judgement or lighting apparatus.
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| CN106159997A (en) * | 2016-07-13 | 2016-11-23 | 上能电气股份有限公司 | The control method of eliminating transformer open circuit loss in a kind of photovoltaic system |
| CN206471836U (en) * | 2017-02-03 | 2017-09-05 | 河南森源电气股份有限公司 | A kind of photovoltaic case becomes night from disengaging power network energy-saving cabinet and photovoltaic generating system |
| CN207705784U (en) * | 2017-12-13 | 2018-08-07 | 江苏蓝天光伏科技有限公司 | A kind of energy saver for transformer in solar power plant |
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