CN105914745B - Structure of voltage regulation and control method for renewable energy system - Google Patents
Structure of voltage regulation and control method for renewable energy system Download PDFInfo
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The present invention is provided to the structure of voltage regulation of renewable energy system, the structure of voltage regulation is connected in renewable energy system, which includes voltage compensation module, non-critical loads module I, non-critical loads module II, critical loads module and working range adjustment module interconnected.Meanwhile providing a kind of control method of structure of voltage regulation for renewable energy system.The present invention changes the ratio of non-critical loads module resistance value and critical loads module resistance value, and then changes the efficient working range of the structure of voltage regulation, can be by the job enlargement 35% of structure of voltage regulation.Structure of voltage regulation of the invention is not only simple in structure, and it can be embedded into extensively among such as water heater, air-conditioning non-critical loads, provide a kind of distributed voltage compensation strategy, the Stability and dependability for strengthening renewable energy system, may advantageously facilitate the large-scale application of renewable energy.
Description
Technical field
The present invention relates to AC network run control technology field, it is especially a kind of for renewable energy system
The adjustable structure of voltage regulation of working range and control method.
Background technique
With the development of renewable energy (such as wind energy, solar energy) generation technology, grid connection capacity increases year by year.
For large-scale power grid, because its capacity of self-regulation is stronger, and renewable energy power generation amount proportion is also little, electricity
Net stability not will receive too big influence.For isolated micro-capacitance sensor lesser for capacity, renewable energy power generation amount institute accounting
Weight is commonly greater than 15%, if its irregular output power cannot mutually be balanced with network load, will cause power grid electricity
It is pressed with the obvious fluctuation of valid value.The fluctuation of this alternating voltage virtual value can set the electricity consumption of grid stability and access micro-capacitance sensor
It is standby to have an adverse effect.
For the intermittent feature of renewable energy power generation, traditional solution is to utilize energy-storage battery or static same
The devices such as step compensator carry out the difference between offset electricity generation amount and network load, and then reach the effect for maintaining Network Voltage Stability
Fruit, but these methods can be such that cost dramatically increases or due to being difficult to realize in time dependent on complicated centralized compensation policy
Compensation.
Summary of the invention
In view of the above technology the problem of, the object of the present invention is to provide one kind to be used for renewable energy system
Structure of voltage regulation and control method, can not only realize that generated energy is mutually balanced with power load, to critical loads module both ends
The fluctuation of voltage effective value is effectively inhibited, and the range of fluctuation voltage that structure of voltage regulation can effectively inhibit is can to adjust
Section, the reliability of structure of voltage regulation can be improved.
To achieve the above object, the technical solution adopted by the present invention is that providing a kind of for renewable energy system
Structure of voltage regulation, the structure of voltage regulation are connected in renewable energy system, in which: the structure of voltage regulation includes voltage compensation mould
Block, non-critical loads module I, non-critical loads module II, critical loads module, working range adjustment module, operating voltage inspection
It surveys module and line voltage detection module, the critical loads module is connected to the renewable energy system by transfer wire
Generator unit output end, after the non-critical loads module I and the voltage compensation block coupled in series, connect by transfer wire
To the output end of the generator unit of the renewable energy system, single load in the non-critical loads module II with
Switching device is connected in series, can it is in parallel with non-critical loads module I by working range adjustment module control switch device or
With critical loads wired in parallel；The voltage compensation module is inverse comprising DC voltage source, LC low-pass filter, single-phase electricity potential source type
Become device module and line voltage control module, the exchange outlet side of the single-phase electricity potential source type inverter module 7 and the LC low pass
Filter is connected, and the direct current input of the single-phase electricity potential source type inverter module 7 flanks the DC voltage source, and the LC is low
The filter capacitor of bandpass filter is connected with the non-critical loads module I.
A kind of control method of structure of voltage regulation for renewable energy system is provided simultaneously.
Effect of the invention is the structure of voltage regulation for renewable energy system, and efficient working range is adjustable
, the Stability and dependability of renewable energy system can be strengthened, may advantageously facilitate the big rule of renewable energy power generation
Mould application.
(1) structure of voltage regulation of the invention makes the voltage effective value in non-critical loads module with can by voltage compensation module
Renewable source of energy generation unit output voltage changes and changes, and the voltage in critical loads module keeps stablizing.With traditional collection
Chinese style compensation device such as static synchronous compensator compares, and the voltage compensation module can be embedded into extensively non-critical loads (such as
Water heater, refrigerator) in, a kind of simple, distributed voltage compensation strategy is provided, obtains the voltage on critical loads more
Effective compensation.Simultaneously as the voltage that the structure of voltage regulation need to only compensate in critical loads module makes it stable without compensating
Voltage in non-critical loads module, so for maintaining the energy-storage battery of output voltage stabilization in renewable energy system
Capacity can reduce 50%, reduce the cost of renewable energy system.
(2) structure of voltage regulation of the invention is controlled by working range adjustment module and is individually born in non-critical loads module II
The connecting path for the switching device being connected in series is carried, the ratio of non-critical loads module resistance value and critical loads module resistance value is changed,
And then change the efficient working range of structure of voltage regulation, by the job enlargement 35% of structure of voltage regulation.
Detailed description of the invention
Fig. 1 is the topology of the adjustable structure of voltage regulation of the working range for renewable energy system of the invention
Figure；
Fig. 2 is the work flow diagram of structure of voltage regulation of the present invention；
Fig. 3 is that renewable energy power generation unit output voltage Vg virtual value and critical loads both end voltage Vs of the present invention are effective
It is worth waveform diagram；
Fig. 4 is that renewable energy power generation unit output voltage Vg virtual value and critical loads both end voltage Vs of the present invention are effective
It is worth waveform diagram；
Fig. 5 is that renewable energy power generation unit output voltage Vg virtual value and critical loads both end voltage Vs of the present invention are effective
It is worth waveform diagram.
In figure:
1, generator unit 2, non-critical loads module I 3, non-critical loads module II
4, critical loads module 5, voltage compensation module 6, DC voltage source
7, single-phase electricity potential source type inverter 8, filter inductance 9, filter capacitor
10, line voltage control module 11, working range adjustment module 12, switching device
13, transmission line of electricity equivalent inductance 14, transmission line of electricity equivalent resistance 15, operating voltage detection module
16, line voltage detection module
Specific embodiment
Closer one is done to the structure of voltage regulation and control method for renewable energy system of the invention in conjunction with attached drawing
The explanation of step.
Structure of voltage regulation and design of control method thought for renewable energy system of the invention is based on described
Renewable energy system, due to the intermittent feature of renewable energy power generation, the power generation list of renewable energy system
The virtual value of the alternating voltage of 1 output of member is irregular in a certain range.The structure of voltage regulation is in development of renewable energy
For the structure of voltage regulation maintaining alternating-voltage stabilization in critical loads module 4, working range is adjustable in electric system.
Structure of voltage regulation for renewable energy system of the invention is that the structure of voltage regulation is connected to renewable energy
In electricity generation system, the structure of voltage regulation include voltage compensation module 5, non-critical loads module I 2, non-critical loads module II 3,
Critical loads module 4, working range adjustment module 11, operating voltage detection module 15, line voltage detection module 16, the key
Load blocks 4 are connected to the output end of the generator unit 1 of the renewable energy system by transfer wire, described non-key
After load blocks I 2 are connected with the voltage compensation module 5, the renewable energy system is connected to by transfer wire
The output end of generator unit 1, the single load in the non-critical loads module II 3 are connected in series with switching device 12, pass through work
It is in parallel with non-critical loads module I 2 or in parallel with critical loads module 4 to make 11 control switch device 12 of range adjustment module；
The voltage compensation module 5 includes DC voltage source 6, LC low-pass filter, single-phase electricity potential source type inverter module 7 and line voltage
The exchange outlet side of control module 10, the single-phase electricity potential source type inverter module 7 is connected with the LC low-pass filter, institute
The direct current input for stating single-phase electricity potential source type inverter module 7 flanks the DC voltage source 6, the filtering of the LC low-pass filter
Capacitor 9 is connected with the non-critical loads module I 2.
The non-critical loads module I 2, non-critical loads module II 3 are comprising one or more work electricity being in parallel
Press range in the non-critical loads of 150V-280V.
The critical loads module 4 includes key of one or more operating voltage ranges being in parallel in 215V-225V
Load.The line voltage detection module 16 detects the virtual value of 4 both end voltage of critical loads module by voltage sensor, and
Send the line voltage virtual value to the voltage compensation module 5.The DC voltage source 6 is battery group or rectification circuit
Parallel electrolytic capacitance module.The single-phase electricity potential source type inverter module 7 is the single-phase full bridge inverter circuit of 4 switching tubes composition
The single-phase semi-bridge inversion circuit or multistage inverter circuit of either 2 switching tube compositions.The line voltage control module 10
According to the line voltage virtual value that the line voltage detection module 16 transmits, generates pwm signal and control the single-phase electricity potential source type inversion
The output compensation alternating voltage of device module 7.The voltage compensation module 5 make the voltage effective value at 2 both ends of non-critical loads module I with
The output voltage of renewable energy power generation unit 1 changes and changes, and the voltage in the critical loads module 4 keeps stablizing.
The renewable energy power generation that the working range adjustment module 11 is transmitted according to the operating voltage detection module 15
The virtual value of the output voltage of unit 11 selects the working range of the structure of voltage regulation, control and the non-critical loads module
It individually loads the connecting path for the switching device 12 being connected in series in II 3, selects in non-critical loads module II 3 individually load and institute
It is in parallel or in parallel with the critical loads module 4 to state non-critical loads module I 2, adjustment non-critical loads module resistance value and pass
The ratio of key load blocks resistance value, and adjust the efficient working range of the structure of voltage regulation.The operating voltage detection module 15 is logical
Overvoltage sensor detects the virtual value of the output voltage of the generator unit 1 of the renewable energy system, and should
Operating voltage virtual value sends the working range adjustment module 11 to.
The control method step of structure of voltage regulation for renewable energy system of the invention are as follows:
A): irregular variation occurs for the alternating voltage virtual value that the generator unit 1 of renewable energy system exports,
The virtual value of generator unit (1) output voltage Vg of renewable energy system is detected with work voltage detection module 15, and
And send working range adjustment module (11) to；
B): working range adjustment module 11 is according to generator unit (1) output voltage Vg's of renewable energy system
Virtual value judges whether the voltage is in the working range 1 of structure of voltage regulation, if Vg virtual value is higher or lower than working range
1, working range adjustment module 11 just successively controls and individually loads the switching device 12 being connected in series in non-critical loads module II 3
Connecting path, it is in parallel with non-critical loads module I 2 to make non-critical loads module II 3, to expand the work of the structure of voltage regulation
Range 1 makes the virtual value of Vg in working range 2 to working range 2；
C): if working range adjustment module 11 judges Vg virtual value in the working range 1 or working range 2 of structure of voltage regulation
Interior, line voltage detection module 16 just detects the voltage Vs virtual value at 4 both ends of critical loads module, and sends line voltage control to
Module 10；
D): the virtual value of Vs and 4 rated operational voltage Vref of critical loads module are set as by line voltage control module 10
220V compares, if Vs virtual value is equal to Vref, the output of line voltage control module 10 is maintained for constant, voltage compensation module
5 offset voltage Vc is remained unchanged；If Vs virtual value is not equal to Vref, the output of line voltage control module 10 just changes, and controls
The ac output voltage of single-phase electricity potential source type inverter 7 processed changes, and offset voltage Vc amplitude changes, until critical loads mould
The voltage Vs virtual value at 4 both ends of block is equal with Vref.
Structure of voltage regulation and control method for renewable energy system of the invention is achieved in that
As shown in Figure 1, being the structure of voltage regulation topological diagram for renewable energy system of the invention.The system is main
Generator unit 1, non-critical loads module I 2 including renewable energy system, non-critical loads module II 3, critical loads
Module 4, voltage compensation module 5, working range adjustment module 11, operating voltage detection module 15 and line voltage detection module 16.
The non-critical loads module I 2 is in parallel comprising one or more non-key with non-critical loads module II 3
Load.Critical loads module 4 includes one or more critical loads being in parallel.Non-critical loads refer to that operating voltage range reaches
To the load of 150V-280V, common non-critical loads such as water heater, air-conditioning etc..Critical loads refer to that operating voltage range limits
In the load of 215V-225V, common critical loads such as computer, ECG monitor etc..
After the non-critical loads module I 2 is connected with voltage compensation module 5, renewable energy is connected to by transfer wire
The output end of the generator unit 1 of electricity generation system.Critical loads module 4 is connected to renewable energy system also by transmission line of electricity
1 output end of generator unit.Single load in non-critical loads module II 3 is connected in series with switching device 12, by working range
11 control switch device 12 of adjustment module is in parallel with non-critical loads module I 2 or critical loads module 4 is in parallel.
The voltage compensation module 5 includes a DC voltage source 6, one of single-phase electricity potential source type inverter module 7, one
LC low-pass filter and with a line voltage control module 10.The direct current input of Single-Phase Voltage-Source Inverters module 7 flanks direct current
Voltage source 6, exchange output flank LC low-pass filter.Single-Phase Voltage-Source Inverters module 7 can be the list of 4 switching tubes composition
The single-phase semi-bridge inversion circuit or multistage inverter circuit of either 2 switching tube compositions of phase full bridge inverter.DC voltage
Source 6 is battery group or rectification circuit parallel electrolytic capacitance module.The filter capacitor 9C of LC low-pass filterfWith critical loads
Module I 2 is connected to 1 output end of generator unit of renewable energy system by transmission line of electricity after connecting.Line voltage controls mould
10 output pwm signal of block drives the switching tube in single-phase electricity potential source type inverter 7, controls filter capacitor 9CfUpper alternating voltage Vc
Virtual value.
The non-critical loads module II 3 by switching device 12 select it is in parallel with non-critical loads module I 2 or with pass
Key load blocks 4 are in parallel.If non-critical loads module II 3 is in parallel with non-critical loads module I 2, so that it may will be non-key
Load blocks I 2 regard 1 non-critical loads module as with non-critical loads module II 3 together.Similarly, if non-critical loads mould
Block II 3 is in parallel with critical loads module 4, and non-critical loads module II is just regarded as to a non-pass together with critical loads module
Key load blocks.The ratio of change non-critical loads module resistance value and critical loads module resistance value can change the work of structure of voltage regulation
Make range.Therefore working range adjustment module 11 by control in non-critical loads module II 3 individually load be connected in series open
Close the connecting path of device 12, thus it is possible to vary the ratio of non-critical loads module resistance value and critical loads module resistance value, Jin Ergai
Become the working range of structure of voltage regulation.
The 1 output voltage Vg of generator unit that the operating voltage detection module 15 detects renewable energy system is effective
Value, line voltage detection module 16 detect the virtual value of 4 both ends line voltage Vs of critical loads module, and Vg and Vs feed back to work respectively
Range adjustment module 11 and line voltage control module 10.
Since Intensity of the sunlight, wind speed constantly change, the renewable energy system based on solar energy or wind energy
1 output power of generator unit also constantly changes, and it is continually changing that the generator unit 1 of renewable energy system exports virtual value
Single-phase AC voltage Vg causes the line voltage Vs at 4 both ends of critical loads module also can constantly change.Line voltage Vs's is this continuous
Fluctuation not only can bring adverse effect to the reliability service of critical loads, can even cause even more serious consequence sometimes.Such as
The ECG monitor of hospital, the requirement to operating voltage is just relatively stringenter, once voltage fluctuation causes instrument cannot reliable work
Make, it is possible to patient safety can be jeopardized.
The working principle of structure of voltage regulation of the present invention: (1) with voltage compensating module 5 filter capacitor 9C is controlledfAlternating voltage
Vc fluctuates the voltage in non-critical loads module I 2 with the fluctuation of Vg, and the power that non-critical loads module I 2 consumes is with hair
1 output power of electric unit changes and changes, and the power for guaranteeing that critical loads module 4 consumes remains unchanged, to make critical loads
The line voltage Vs at 4 both ends of module maintains to stablize；(2) by control with individually load is connected in series in non-critical loads module II 3
The connecting path of switching device 12 changes the ratio of non-critical loads module resistance value and critical loads module resistance value, and then adjusts
The working range of structure of voltage regulation.
It is the flow chart of structure of voltage regulation work as shown in Figure 2, the work of the structure of voltage regulation is illustrated below with reference to embodiment
Process and effect.
Establish the structure of voltage regulation for renewable energy power generation as shown in Figure 1, wherein renewable energy system
Generator unit 1 is the adjustable single-phase electricity potential source of output, transmission line of electricity and line loss 0.1 Ω resistance 14 and 2.2mH
13 series equivalent of inductance, LC low-pass filter parameter is respectively 3mH and 50uF.Single-phase electricity potential source type inverter module, 7 be four
The single-phase full bridge circuit that MOSFET is constituted, direct current input flank 350V battery pack.Non-critical loads module I 2 has 10 100 Ω
Resistance it is parallel with one another, non-critical loads module II 3 has the resistance of 5 100 Ω parallel with one another, and critical loads module 4 also has 5
100 Ω resistance are parallel with one another.
(a) 5 resistance of non-critical loads module II are made all to be in parallel with critical loads module, then critical loads at this time
The ratio of resistance value and non-critical loads resistance value is
When being that voltage compensation module does not work as shown in Figure 3, filter capacitor 9C in Fig. 1 is made by by-pass switchfShort circuit, can
The 1 output voltage Vg virtual value of generator unit of renewable energy generating system and 4 both end voltage Vs virtual value of critical loads module
Waveform diagram, solid line are Vs virtual value, and dotted line is Vg virtual value.By the variation for setting single-phase electricity potential source output voltage Vg virtual value
Come simulate renewable energy system 1 output voltage of generator unit variation, wherein 0-1.5s Vg be 220V, 1.5s-3s
Vg falls to 217V, and 3s-4.5s Vg rises to 233V, and 4.5s-6s Vg rises to 234.5V, and 6s-7.5s Vg is fallen to
215V.It can be seen that 4 both end voltage Vs virtual value of critical loads module always changes in the variation with Vg from Fig. 3 solid line,
It cannot stablize in its rated operational voltage 220V, the fluctuation of this operating voltage virtual value can be to critical loads, such as precision equipment
Adverse effect is brought with the reliability service of instrument.
When being that voltage compensation module 5 works as shown in Figure 4,1 output voltage of generator unit of renewable energy system
The waveform diagram of Vg virtual value and 4 both end voltage Vs virtual value of critical loads module, solid line are Vs virtual value, and dotted line is that Vg is effective
Value.Equally, the hair of renewable energy system is simulated by the variation of setting single-phase electricity potential source output voltage Vg virtual value
The variation of 1 output voltage of electric unit, wherein 0-1.5s Vg is 220V, and 1.5s-3s Vg falls to 217V, and 3s-4.5s Vg rises
234.5V is risen to for 233V, 4.5s-6s Vg, 6s-7.5s Vg falls to 215V.It can be seen that from Fig. 4 solid line in 0-4.5s
Interior, after Vg changes, the virtual value of 4 both end voltage Vs of critical loads module can be stabilized to 220V quickly.But
4.5s-7.5s, after Vg is more than a certain range, Vs cannot finally converge to 220V.Therefore when critical loads resistance value with it is non-key
When the ratio of load resistance value is fixed, the efficient working range of structure of voltage regulation is conditional.For example, critical loads hinder in Fig. 4 example
The ratio of value and non-critical loads resistance value isThe working range of structure of voltage regulation is working range 1 at this time
(216.3V-233V), when the 1 output voltage Vg virtual value of generator unit of renewable energy system is in working range 1
When, structure of voltage regulation can stablize the voltage effective value in critical loads module 4 in 220V, when renewable energy system
When 1 output voltage Vg virtual value of generator unit exceeds the efficient working range 1 of structure of voltage regulation, the working range of structure of voltage regulation is also answered
This makes corresponding adjustment, can just make the voltage stabilization at 4 both ends of critical loads module in its rated operational voltage.
(b) when 1 output voltage Vg virtual value of the generator unit of renewable energy system is beyond the effective of structure of voltage regulation
When working range 1, the work step for being illustrated in combination with fig. 2 the adjustable structure of voltage regulation of working range of the invention is as follows:
Operating voltage detection module 15 detects that the generator unit 1 of renewable energy system exports with voltage sensor
Voltage Vg virtual value and send working range adjustment module 11 to, working range adjustment module 11 by Vg virtual value, such as
235V has found the generator unit 1 of renewable energy system compared with structure of voltage regulation working range 1 (216.3V-233V)
Output voltage Vg virtual value has exceeded structure of voltage regulation working range 1, just passes through 11 control switch of working range adjustment module at this time
2 resistance in non-critical loads module II 3 are kept being in parallel with critical loads module 4 by the connecting path of device 12, and its
3 resistance of remaininging are in parallel with non-critical loads module I 2, and the ratio of critical loads resistance value and non-critical loads resistance value is at this timeAnd the working range of structure of voltage regulation has been extended to working range 2 (213.2V-235V).
Line voltage detection module 16 just detects the voltage Vs virtual value at 4 both ends of critical loads module at this time, and sends to
Line voltage control module 10；Line voltage control module 10 is by the virtual value of Vs and 4 rated operational voltage Vref of critical loads module
It is set as 220V to compare, if Vs virtual value is equal to Vref, the output of line voltage control module 10 is maintained for constant, voltage benefit
The offset voltage Vc for repaying module 5 is remained unchanged；If Vs virtual value is not equal to Vref, the output of line voltage control module 10 just becomes
Change, the ac output voltage variation of control single-phase electricity potential source type inverter 7, offset voltage Vc amplitude changes, until crucial
The voltage Vs virtual value at 4 both ends of load blocks is equal with Vref.
When being that voltage compensation module 5 works as shown in Figure 5,1 output voltage of generator unit of renewable energy system
The waveform diagram of Vg virtual value and 4 both end voltage Vs virtual value of critical loads module, solid line are Vs virtual value, and dotted line is that Vg is effective
Value.Equally, the hair of renewable energy system is simulated by the variation of setting single-phase electricity potential source output voltage Vg virtual value
The variation of 1 output voltage of electric unit, wherein 0-1.5s Vg is 220V, and 1.5s-3s Vg falls to 217V, and 3s-4.5s Vg rises
234.5V is risen to for 233V, 4.5s-6s Vg, 6s-7.5s Vg falls to 215V.It can be seen that from Fig. 5 solid line in 0-7.5s
In, after Vg changes, the virtual value of 4 both end voltage Vs of critical loads module can be stabilized to 220V quickly, and this is in Fig. 4
In be irrealizable.Therefore, change structure of voltage regulation by changing the ratio of critical loads resistance value and non-critical loads resistance value
Working range be feasible.
Structure of voltage regulation provided by the invention is according to the 1 output voltage Vg virtual value of generator unit of renewable energy system
Fluctuation range automatic adjustment structure of voltage regulation working range, so that 4 both ends of critical loads module will be maintained, to maintain its specified
Operating voltage can strengthen the Stability and dependability of renewable energy system, may advantageously facilitate renewable energy power generation
Large-scale application.
Claims (6)
1. a kind of structure of voltage regulation for renewable energy system, the structure of voltage regulation are connected to renewable energy system
In, it is characterized in that: the structure of voltage regulation includes voltage compensation module (5), non-critical loads module I (2), non-critical loads module
II (3), critical loads module (4), working range adjustment module (11), line voltage detection module (16) and operating voltage detect mould
Block (15), the critical loads module (4) are connected to the generator unit (1) of the renewable energy system by transfer wire
Output end institute is connected to by transfer wire after the non-critical loads module I (2) is connected with the voltage compensation module (5)
State the output end of the generator unit (1) of renewable energy system, the single load in the non-critical loads module II (3)
It is connected in series with switching device (12), passes through working range adjustment module (11) control switch device (12) and non-critical loads module
I (2) is in parallel or in parallel with critical loads module (4)；
The voltage compensation module (5) includes DC voltage source (6), LC low-pass filter, single-phase electricity potential source type inverter module
(7) and line voltage control module (10), the exchange outlet side of the single-phase electricity potential source type inverter module (7) and the LC low pass
Filter is connected, and the direct current input of the single-phase electricity potential source type inverter module (7) flanks the DC voltage source (6), institute
The filter capacitor (9) for stating LC low-pass filter is connected with the non-critical loads module I (2)；
The non-critical loads module I (2), non-critical loads module II (3) are comprising one or more work electricity being in parallel
Press range in the non-critical loads of 150V-280V；
The critical loads module (4) includes that key of one or more operating voltage ranges being in parallel in 215V-225V is negative
It carries；
The DC voltage source (6) is battery group or rectification circuit parallel electrolytic capacitance module；
The single-phase electricity potential source type inverter module (7) is that the single-phase full bridge inverter circuit of 4 switching tubes composition is either opened for 2
Close the single-phase semi-bridge inversion circuit or multistage inverter circuit of pipe composition.
2. the structure of voltage regulation of renewable energy system is used for according to claim 1, it is characterized in that: the line voltage control
The line voltage virtual value that molding block (10) is transmitted according to the line voltage detection module (16) generates pwm signal and controls the list
Phase voltage source type inverter module (7) output compensation alternating voltage.
3. the structure of voltage regulation of renewable energy system is used for according to claim 1, it is characterized in that: the working range
The output electricity for the renewable energy power generation unit (11) that adjustment module (11) is transmitted according to the operating voltage detection module (15)
The virtual value of pressure selects the working range of the structure of voltage regulation, controls and individually loads in the non-critical loads module II (3)
The connecting path for the switching device (12) being connected in series, select non-critical loads module II (3) in individually load with it is described non-key
Load blocks I (2) are in parallel or in parallel with critical loads module (4), and adjustment non-critical loads module resistance value and key are negative
The ratio of module resistance value is carried, and adjusts the efficient working range of the structure of voltage regulation.
4. the structure of voltage regulation of renewable energy system is used for according to claim 1, it is characterized in that: the operating voltage
Detection module (15) has by generator unit (1) output voltage that voltage sensor detects the renewable energy system
Valid value, and send the virtual value of the output voltage to the working range adjustment module (11).
5. the structure of voltage regulation of renewable energy system is used for according to claim 1, it is characterized in that: the line voltage is examined
Module (16) are surveyed by the virtual value of voltage sensor detection critical loads module (4) both end voltage, and by the both end voltage
Virtual value sends the voltage compensation module (5) to.
6. the control method for the structure of voltage regulation of renewable energy system according to claim 1, it is characterized in that: should
Method and step are as follows:
A): irregular variation occurs for the alternating voltage virtual value of generator unit (1) output of renewable energy system, uses
Operating voltage detection module (15) detects generator unit (1) output voltage Vg virtual value of renewable energy system, and
Send working range adjustment module (11) to；
B): working range adjustment module (11) has according to generator unit (1) the output voltage Vg's of renewable energy system
Valid value judges whether the voltage is in the working range 1 of structure of voltage regulation, if Vg virtual value is higher or lower than working range 1,
Working range adjustment module (11) just successively controls and individually loads the switching device being connected in series in non-critical loads module II (3)
(12) it is in parallel with non-critical loads module I (2) to make non-critical loads module II (3) for connecting path, to expand the pressure stabilizing knot
The working range 1 of structure makes the virtual value of Vg in working range 2 to working range 2；
C): if working range adjustment module (11) judges generator unit (1) output voltage Vg of renewable energy system
For virtual value in the working range 1 or working range 2 of structure of voltage regulation, line voltage detection module (16) just detects critical loads module
(4) the voltage Vs virtual value at both ends, and send line voltage control module (10) to；
D): the virtual value of Vs and critical loads module (4) rated operational voltage Vref are set as by line voltage control module (10)
220V compares, if Vs virtual value is equal to Vref, the output of line voltage control module (10) is maintained for constant, voltage compensation mould
The offset voltage Vc of block (5) is remained unchanged；If Vs virtual value is not equal to Vref, the output of line voltage control module (10) just becomes
Change, the ac output voltage variation of control single-phase electricity potential source type inverter (7), offset voltage Vc amplitude changes, until closing
The voltage Vs virtual value at key load blocks (4) both ends is equal with Vref.
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| CN105140921A (en) * | 2015-08-06 | 2015-12-09 | 东南大学 | Electric spring topological structure implemented based on current source type inverter and control method of electric spring topological structure |
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