CN109888843A - A kind of power regulating method and system of extensive new energy access DC grid - Google Patents
A kind of power regulating method and system of extensive new energy access DC grid Download PDFInfo
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Abstract
The invention discloses the power regulating methods and system of a kind of extensive new energy access DC grid, which comprises the section active power value of acquisition new energy power junction in real time；It calculates to obtain and adjusts key parameter；The key parameter that adjusts includes the threshold interval being made of adjusting upper limit threshold and adjusting lower threshold；Whether section active power value described in real-time judge exceeds the threshold interval；If exceeding the threshold interval, transmitted power control commands according to preset power regulation magnitude to each subfield station, completes section active power regulation；The method and system avoid causing power wholesale to lack and disturb because cutting machine or converter blocking when new energy power is more than the rated capacity of inverter；The method and system improve the utilization rate of new energy power output and inverter, while by dynamic regulation section active power, active power fluctuation rate can be reduced under the premise of guaranteeing inverter safety, improves the safety of the operation of DC grid.
Description
Technical field
The present invention relates to technical field of electric power, more particularly, to a kind of function of extensive new energy access DC grid
Rate adjusting method and system.
Background technique
Traditional fossil energy is gradually exhausted as a kind of non-renewable resources.Caused by a large amount of consumption of fossil energy
The environmental problems such as global warming and air pollution cause huge threat to the existence of the mankind.Exploitation cleaning, can be again
Raw new energy has become the inevitable choice of human kind sustainable development.As new energy most mature and most with prospects at present
Source, wind-power electricity generation and photovoltaic power generation are grown rapidly in recent years.By in 2017, wind-powered electricity generation installation in China's is up to 1.54 hundred million kilowatts, light
Generator installation is lied prostrate up to 1.02 hundred million kilowatts, total to account for the ratio of national generator installation be more than 13%.New energy have fluctuation and
Having a rest property.The consumption of extensive new energy has become current main problem urgently to be resolved.Based on modularization multi-level converter
Flexible DC transmission technology due to, decoupled active and reactive low with harmonic content control, weak grid or passive network can be connected
And the advantages that easily constituting DC grid, the best skill of generally acknowledged in the world extensive new-energy grid-connected and consumption is had become at present
Art scheme.
In view of the fluctuation of new energy, in practical projects, the total installation of generating capacity of usual new energy can be greater than junction
The rated power of inverter.By taking four end ring shape flexible direct current power grid demonstration project of Zhangbei County's renewable energy as an example, Kangbao County and Zhangbei County
Two rated capacities for collecting converter station are respectively 1500MW, 3000MW, new energy planned capacity be respectively 2250MW,
4500MW.The safety and stability of inverter even DC grid can be threatened when new energy power is more than the rated capacity of inverter
Operation.It more prescribes a time limit in addition, contributing in system security controls strategy when new energy, is usually taken and cuts machine strategy, it can be to system
Cause biggish disturbance.Traditional power regulating method sets single power limit.When total generated output of new energy is out-of-limit
When, issue fall power instruction；Then, fall power instruction new energy substation is distributed to according to default execution sequence to execute.When new
Energy source power decline, when traditional control method returns, the output power of new energy station can generate larger near power limit
Fluctuation.
Summary of the invention
For locking inverter when solving section active power existing for background technique more than inverter rated capacity or cut
The output power that the problem of machine causes disturbance to system and traditional control method return to stylish energy station can be in power limit
Larger fluctuation nearby is led to the problem of, the present invention provides a kind of power regulating methods of extensive new energy access DC grid
And system, the method and system acquire extensive new energy junction by the upper and lower limit threshold value of adjusting power regulation in real time
Section active power, adaptively adjust new energy when new energy power output is close to inverter rated capacity and import DC grid
Power is maintained within upper and lower limit threshold value；A kind of power regulating method of extensive new energy access DC grid includes:
The section active power value of each new energy subfield station power junction is acquired in real time；
Measuring device essence is acquired according to the characteristic of the new energy, the parameter of junction inverter and section active power
Degree calculates and obtains adjusting key parameter；The adjusting key parameter includes by adjusting upper limit threshold and adjusting lower threshold structure
At threshold interval；
Whether section active power value described in real-time judge exceeds the threshold interval；
If exceeding the threshold interval, power regulation is sent to each subfield station according to preset power regulation magnitude and is referred to
It enables, completes section active power regulation.
Further, the tuning formulae for adjusting upper limit threshold are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control
The sum of the power longest response time of system delay processed and new energy subfield station, Vup_maxIncrease for new energy station power output is maximum
Speed, εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
The tuning formulae for adjusting lower threshold are as follows:
Pth_down=Pth_up-ΝΔP
Wherein, Pth_downFor power regulation lower threshold, N is pre-set interval constant, and Δ P is preset power regulation
Value.
Further, the preset power regulation magnitude is greater than the maximum growth rate of new energy station processing and power tune
The product in section control period.
Further, the value range in the power regulation control period is two fastest new energy of power response
The time interval that the response time at subfield station is constituted.
Further, if the section active power value, which is higher than, adjusts upper limit threshold, according to preset power regulation
Value sends power decreasing instruction to each subfield station by preset rules；
If the section active power value is lower than lower threshold is adjusted, according to preset power regulation magnitude by default rule
Then power up-regulation instruction is sent to each subfield station.
Further, it is described transmitted power control commands according to preset power regulation magnitude to each subfield station before, institute
State method further include:
Determine the subfield station of one or more implementable power regulations；
Power is sent to the subfield station of one or more of implementable power regulations according to preset power regulation magnitude
Regulating command；
The method at the subfield station of determining one or more implementable power regulations includes at the subfield station of normal operation
In, one or more subfield stations that selection response speed is higher than pre-set velocity value and real hair power is greater than predetermined power value are used as can
Implement the subfield station of power regulation.
Further, setting power regulation puts into flag bit；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, power tune is set
Section investment flag bit is 0.
A kind of power regulating system of extensive new energy access DC grid includes:
Power collecting unit, the power collecting unit for acquiring each new energy subfield station power junction in real time
Section active power value；
Parameter tuning unit, the parameter tuning unit are used for according to the characteristic of the new energy, junction inverter
Parameter and section active power acquire measuring device precision, calculate and obtain adjusting key parameter；The adjusting key parameter packet
Include the threshold interval being made of adjusting upper limit threshold and adjusting lower threshold；
Power monitoring unit, section of the power monitoring unit for the acquisition of power collecting unit described in real-time judge have
Whether function performance number exceeds the threshold interval；
Execution unit is adjusted, the adjusting execution unit is used to whether monitor section active power value in power monitoring unit
When beyond the case where threshold interval, transmitted power control commands according to preset power regulation magnitude to each subfield station,
Complete section active power regulation.
Further, the formula of upper limit threshold adjusting is adjusted in the parameter tuning unit are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control
The sum of the power longest response time of system delay processed and new energy subfield station, Vup_maxIncrease for new energy station power output is maximum
Speed, εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
The formula of lower threshold adjusting is adjusted in the parameter tuning unit are as follows:
Pth_down=Pth_up-ΝΔP
Wherein, Pth_downFor power regulation lower threshold, N is pre-set interval constant, and Δ P is preset power regulation
Value.
Further, the parameter tuning unit is for presetting power regulation magnitude；The preset power regulation
Magnitude is greater than the product that new energy station handles maximum growth rate and power regulation control period.
Further, the value range in the power regulation control period is two fastest new energy of power response
The time interval that the response time at subfield station is constituted.
Further, if the power monitoring unit monitors the section active power value and is higher than adjusting upper limit threshold,
The adjusting execution unit sends power decreasing instruction to each subfield station by preset rules according to preset power regulation magnitude；
It is held if the power monitoring unit monitors the section active power value lower than lower threshold, the adjusting is adjusted
Row unit sends power up-regulation instruction to each subfield station by preset rules according to preset power regulation magnitude.
Further, the execution unit that adjusts is for determining the subfield station of one or more implementable power regulations；And
It is transmitted power control commands according to preset power regulation magnitude to the subfield station of one or more of implementable power regulations；
The adjusting execution unit be used in the subfield station of normal operation, choose response speed be higher than pre-set velocity value and
Real hair power is greater than subfield station of the one or more subfield stations of predetermined power value as implementable power regulation.
Further, the power monitoring unit is for being arranged power regulation investment flag bit；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, power tune is set
Section investment flag bit is 0.
The invention has the benefit that technical solution of the present invention, gives a kind of extensive new energy access direct current
The power regulating method and system of net, the method and system are by the upper and lower limit threshold value of adjusting power regulation, and acquisition is big in real time
The section active power of scale new energy junction adaptively adjusts new energy when new energy power output is close to inverter rated capacity
The power that source imports DC grid is maintained within upper and lower limit threshold value；The method and system are more than the change of current in new energy power
When the rated capacity of device, avoids causing power wholesale to lack because cutting machine or converter blocking, biggish disturbance is caused to system.
The setting method of power regulation upper and lower limit threshold value described in the method and system can be improved new energy power output and inverter
Utilization rate.Meanwhile the method and system pass through dynamic regulation section active power, it can be before guaranteeing inverter safety
Putting reduces active power fluctuation rate, improves the safety of the operation of DC grid.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is that a kind of extensive new energy of the specific embodiment of the invention accesses the power regulating method of DC grid
Flow chart；
Fig. 2 is that a kind of extensive new energy of the specific embodiment of the invention accesses the power regulating system of DC grid
Structure chart.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is that a kind of extensive new energy of the specific embodiment of the invention accesses the power regulating method of DC grid
Flow chart；As shown in Figure 1, the method and system are by the upper and lower limit threshold value of adjusting power regulation, acquisition in real time is extensive new
The section active power of energy junction adaptively adjusts new energy when new energy power output is close to inverter rated capacity and imports
The power of DC grid is maintained within upper and lower limit threshold value；The described method includes:
Step 110, the section active power value of each new energy subfield station power junction is acquired in real time；
The present embodiment has technical effect that section caused by the extensive new energy for solving access DC grid is active
A series of problems caused by when power is beyond inverter rated capacity is necessary by acquiring section active power value and being monitored
Premise measure, there are many acquisition modes of the section active power value, and this will not be repeated here.
Step 120, it is acquired and is surveyed according to the characteristic of the new energy, the parameter of junction inverter and section active power
Device precision is measured, calculates and obtains adjusting key parameter；The adjusting key parameter includes by adjusting upper limit threshold and under adjusting
Limit the threshold interval that threshold value is constituted；
In the present embodiment, by obtaining the power response characteristic of wind-powered electricity generation and photovoltaic in new energy station, control system is transmitted
Delay, the power swing characteristic of new energy and the precision of measuring system, adjust above-mentioned adjusting key parameter.
Further, the adjusting key parameter adjusts upper limit threshold, adjusts lower threshold, power regulation magnitude, and
For calculating the intermediate quantity of above-mentioned key parameter -- power regulation controls the period；
The value range in the power regulation control period is two fastest new energy subfield stations of power response
The time interval that response time is constituted.
The tuning formulae for adjusting upper limit threshold are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control
The sum of the power longest response time of system delay processed and new energy subfield station, Vup_maxIncrease for new energy station power output is maximum
Speed, εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
In the tuning formulae for adjusting upper limit threshold, first half PconN-Vup_maxTdelay_maxIt represents and adjusts the upper limit
Threshold, mainly consider control system delay with guarantee to meet under power longest response time at new energy subfield station it is new
Threshold needed for the maximum growth rate of energy station power output；But it in practice, also needs to consider a certain amount of allowance, that is, includes function
Rate measures generated error PconNεPowerM%, and control allowance；The control allowance is 5 power regulation control weeks
Phase (i.e. 5Tc), interior new energy station was with Vup_maxThe power of rising；
On the basis of Threshold, above-mentioned allowance is comprehensively considered, can be obtained power regulation upper limit threshold as described above
Value.
For example, it is assumed that new energy installed capacity is 2250MW, the rated power P of junction inverterconN=1500MW, control
System delay 100ms processed, the power longest response time 700ms at new energy subfield station, new energy station power output is maximum to increase speed
Spend Vup_maxFor 30% installed capacity/min, then the upper-bound theory threshold value of the power regulation strategy is Pth_theory=
1494.6MW.In engineering, certain margin Δ P is usually consideredth.Allowance includes the allowance for considering to be stayed when power measurement error
PconNεPowerM%, power measurement error are usually 0.5%；Control allowance, i.e., the 5 interior new energy stations of control period (i.e. 5Tc)
With Vup_maxThe power control period T of risingc=300ms.Therefore, the practical upper limit threshold P of power regulationth_up=Pth_theory-
PconNεPowerM%-5TcVup_max=1477.0MW.
Further, the power regulation lower threshold is according to the power regulation upper limit threshold and a preset threshold value
Interval width determines；The preset power regulation magnitude that the preset threshold interval width is N times；
In the present embodiment, N takes 1.5；Therefore the tuning formulae for adjusting lower threshold are as follows:
Pth_down=Pth_up-1.5ΔP。
Further, before calculating power regulation lower threshold, power regulation magnitude need to first be adjusted；The preset power
It adjusts magnitude and is greater than the product that new energy station handles maximum growth rate and power regulation control period.
Step 130, whether section active power value described in real-time judge exceeds the threshold interval；
Pass through the good power regulation upper limit threshold of above-mentioned adjusting and power regulation lower threshold threshold value section；And root
It is compared according to the threshold interval with real-time section active power value, judges whether there is the abnormal conditions beyond threshold interval.
Step 140, if exceeding the threshold interval, function is sent to each subfield station according to preset power regulation magnitude
Section active power regulation is completed in rate regulating command.
Described to exceed the threshold interval, there are two kinds of situations:
If the section active power value, which is higher than, adjusts upper limit threshold, according to preset power regulation magnitude by default rule
Then power decreasing instruction is sent to each subfield station；
If the section active power value is lower than lower threshold is adjusted, according to preset power regulation magnitude by default rule
Then power up-regulation instruction is sent to each subfield station.
Further, it is described transmitted power control commands according to preset power regulation magnitude to each subfield station before, institute
State method further include:
Determine the subfield station of one or more implementable power regulations；
Power is sent to the subfield station of one or more of implementable power regulations according to preset power regulation magnitude
Regulating command；
The method at the subfield station of determining one or more implementable power regulations includes at the subfield station of normal operation
In, one or more subfield stations that selection response speed is higher than pre-set velocity value and real hair power is greater than predetermined power value are used as can
Implement the subfield station of power regulation.
The subfield station of the i.e. described implementable power regulation needs to include three conditions, operates normally, response speed is high, in real time
Power is big；By the way that preset response speed threshold value and power threshold is arranged, the subfield station that can be used for realtime power adjusting is selected；Also
It can be by tightening or relaxing the magnitude of response speed threshold value and power threshold, the size of Lai Peihe power regulation magnitude.
In the present embodiment, the power threshold selects 0.2 times of power regulation magnitude.
Distribution of the power regulation magnitude in the multiple subfield stations for the implementable power regulation picked out can be flat
It distributes, can also be allocated according to default rule and weight；It, can speed and in fact hair power according to response in the present embodiment
Calculate weight.
Further, confirm that current adjustment state, settable power regulation put into flag bit for convenience；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, power tune is set
Section investment flag bit is 0.
The method is using the section active power of extensive new energy junction as by controlled device, when new energy is contributed
When close to inverter rated capacity, by upper and lower limit threshold restriction, dynamic regulation section active power makes it be no more than the change of current
The rated value of device avoids cutting machine or converter blocking to system caused by power is out-of-limit to guarantee the safe operation of inverter
It causes to disturb, improves the safety and reliability of DC grid.
Fig. 2 is that a kind of extensive new energy of the specific embodiment of the invention accesses the power regulating system of DC grid
Structure chart.As shown in Fig. 2, the system comprises:
Power collecting unit 210, the power collecting unit 210 for acquiring the remittance of each new energy subfield station power in real time
The section active power value of Ji Chu；
Parameter tuning unit 220, the parameter tuning unit 220 according to the characteristic of the new energy, junction for changing
The parameter and section active power for flowing device acquire measuring device precision, calculate and obtain adjusting key parameter；The adjusting is crucial
Parameter includes the threshold interval being made of adjusting upper limit threshold and adjusting lower threshold；
Further, the formula of upper limit threshold adjusting is adjusted in the parameter tuning unit 220 are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control
The sum of the power longest response time of system delay processed and new energy subfield station, Vup_maxIncrease for new energy station power output is maximum
Speed, εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
The formula of lower threshold adjusting is adjusted in the parameter tuning unit 220 are as follows:
Pth_down=Pth_up-ΝΔP
Wherein, Pth_downFor power regulation lower threshold, N is pre-set interval constant, and Δ P is preset power regulation
Value.
Further, the parameter tuning unit 220 is for presetting power regulation magnitude；The preset power tune
It saves magnitude and is greater than the product that new energy station handles maximum growth rate and power regulation control period.
Further, the value range in the power regulation control period is two fastest new energy of power response
The time interval that the response time at subfield station is constituted.
Power monitoring unit 230, the power monitoring unit 230 are adopted for power collecting unit 210 described in real-time judge
Whether the section active power value of collection exceeds the threshold interval；
Execution unit 240 is adjusted, the adjusting execution unit 240 is used to monitor section in power monitoring unit 230 active
When the case where whether performance number exceeds the threshold interval, power is sent to each subfield station according to preset power regulation magnitude
Section active power regulation is completed in regulating command.
Further, if the power monitoring unit 230 monitors the section active power value and is higher than adjusting upper limit threshold,
Then the adjusting execution unit 240 sends power decreasing to each subfield station by preset rules according to preset power regulation magnitude and refers to
It enables；
If the power monitoring unit 230 monitors the section active power value lower than adjusting lower threshold, the tune
It saves execution unit 240 and power up-regulation instruction is sent to each subfield station by preset rules according to preset power regulation magnitude.
Further, the execution unit 240 that adjusts is for determining the subfield station of one or more implementable power regulations；
And power regulation is sent to the subfield station of one or more of implementable power regulations according to preset power regulation magnitude and is referred to
It enables；
The adjusting execution unit 240 is used in the subfield station of normal operation, is chosen response speed and is higher than pre-set velocity
Value and the real subfield station for sending out one or more subfield stations of the power greater than predetermined power value as implementable power regulation.
Further, the power monitoring unit 230 is for being arranged power regulation investment flag bit；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, power tune is set
Section investment flag bit is 0.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the disclosure
Example can be practiced without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this specification.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.The step of being related in this specification, which numbers, is only used for distinguishing each step, and the time being not limited between each step
Or the relationship of logic, restriction unless the context clearly, otherwise the relationship between each step includes the case where various possible.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means to be in the disclosure
Within the scope of and form different embodiments.For example, embodiment claimed in detail in the claims is one of any
Can in any combination mode come using.
The various component embodiments of the disclosure can be implemented in hardware, or to run on one or more processors
Software module realize, or be implemented in a combination thereof.The disclosure is also implemented as executing side as described herein
The some or all equipment or system program (for example, computer program and computer program product) of method.It is such
It realizes that the program of the disclosure can store on a computer-readable medium, or can have the shape of one or more signal
Formula.Such signal can be downloaded from an internet website to obtain, and perhaps be provided on the carrier signal or with any other shape
Formula provides.
The disclosure is limited it should be noted that above-described embodiment illustrates rather than the disclosure, and ability
Field technique personnel can be designed alternative embodiment without departing from the scope of the appended claims.Word "comprising" is not arranged
Except there are element or steps not listed in the claims.Word "a" or "an" located in front of the element does not exclude the presence of more
A such element.The disclosure can be by means of including the hardware of several different elements and by means of properly programmed calculating
Machine is realized.If several in these systems can be by same in the unit claim for listing dry systems
Hardware branch embodies.
The above is only the specific embodiment of the disclosure, it is noted that for the ordinary skill people of this field
Member for, do not depart from the disclosure spirit under the premise of, can make several improvements, modify and deform, these improve, modification,
It is regarded as falling within the scope of protection of this application with deformation.
Claims (14)
1. a kind of power regulating method of extensive new energy access DC grid, which comprises
The section active power value of each new energy subfield station power junction is acquired in real time；
Measuring device precision is acquired according to the characteristic of the new energy, the parameter of junction inverter and section active power,
It calculates to obtain and adjusts key parameter；The adjusting key parameter includes being made of adjusting upper limit threshold and adjusting lower threshold
Threshold interval；
Whether section active power value described in real-time judge exceeds the threshold interval；
If exceeding the threshold interval, transmitted power control commands according to preset power regulation magnitude to each subfield station,
Complete section active power regulation.
2. according to the method described in claim 1, it is characterized by: the tuning formulae for adjusting upper limit threshold are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control system
The sum of the power longest response time of system delay and new energy subfield station, Vup_maxIt contributes maximum growth rate for new energy station,
εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
The tuning formulae for adjusting lower threshold are as follows:
Pth_down=Pth_up-ΝΔP
Wherein, Pth_downFor power regulation lower threshold, N is pre-set interval constant, and Δ P is preset power regulation magnitude.
3. according to the method described in claim 1, it is characterized by: the preset power regulation magnitude is greater than new energy station
Handle the product of maximum growth rate and power regulation control period.
4. according to the method in claim 2 or 3, it is characterised in that: the value range in power regulation control period is
The time interval that the response time at two fastest new energy subfield stations of power response is constituted.
5. according to the method described in claim 1, it is characterized by:
If the section active power value be higher than adjust upper limit threshold, according to preset power regulation magnitude by preset rules to
Each subfield station sends power decreasing instruction；
If the section active power value lower than adjust lower threshold, according to preset power regulation magnitude by preset rules to
Each subfield station sends power up-regulation instruction.
6. method according to claim 1 or 5, which is characterized in that it is described according to preset power regulation magnitude to each
Before subfield station transmits power control commands, the method also includes:
Determine the subfield station of one or more implementable power regulations；
Power regulation is sent to the subfield station of one or more of implementable power regulations according to preset power regulation magnitude
Instruction；
The method at the subfield station of determining one or more implementable power regulations includes the choosing in the subfield station of normal operation
Response speed is taken to be higher than pre-set velocity value and real one or more subfield stations of the power greater than predetermined power value of sending out as implementable
The subfield station of power regulation.
7. according to the method described in claim 1, it is characterized by:
Power regulation is set and puts into flag bit；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, setting power regulation is thrown
Entering flag bit is 0.
8. a kind of power regulating system of extensive new energy access DC grid, the system comprises:
Power collecting unit, the power collecting unit are used to acquire the section of each new energy subfield station power junction in real time
Active power value；
Parameter tuning unit, the parameter tuning unit is for characteristic, the parameter of junction inverter according to the new energy
And section active power acquires measuring device precision, calculates and obtains adjusting key parameter；The adjusting key parameter include by
It adjusts upper limit threshold and adjusts the threshold interval that lower threshold is constituted；
Power monitoring unit, section wattful power of the power monitoring unit for the acquisition of power collecting unit described in real-time judge
Whether rate value exceeds the threshold interval；
Execution unit is adjusted, the adjusting execution unit is used to whether exceed in power monitoring unit monitoring section active power value
It when the case where threshold interval, is transmitted power control commands, is completed to each subfield station according to preset power regulation magnitude
Section active power regulation.
9. system according to claim 8, it is characterised in that: upper limit threshold adjusting is adjusted in the parameter tuning unit
Formula are as follows:
Pth_up=PconN-Tdelay_maxVup_max-PconNεPowerM%-5TcVup_max
Wherein, Pth_upFor power regulation upper limit threshold, PconNFor the rated power of junction inverter, Tdelay_maxFor control system
The sum of the power longest response time of system delay and new energy subfield station, Vup_maxIt contributes maximum growth rate for new energy station,
εPowerM% is the percentage error of power-measuring device, TcThe period is controlled for power regulation；
The formula of lower threshold adjusting is adjusted in the parameter tuning unit are as follows:
Pth_down=Pth_up-ΝΔP
Wherein, Pth_downFor power regulation lower threshold, N is pre-set interval constant, and Δ P is preset power regulation magnitude.
10. system according to claim 8, it is characterised in that: the parameter tuning unit is for presetting power tune
Save magnitude；The preset power regulation magnitude is greater than new energy station and handles maximum growth rate and power regulation control period
Product.
11. system according to claim 9 or 10, it is characterised in that: the value range in the power regulation control period
The time interval constituted for the response time at two fastest new energy subfield stations of power response.
12. system according to claim 8, it is characterised in that:
If the power monitoring unit, which monitors the section active power value, is higher than adjusting upper limit threshold, the adjusting executes list
Member sends power decreasing instruction to each subfield station by preset rules according to preset power regulation magnitude；
If the power monitoring unit, which monitors the section active power value, executes list lower than lower threshold, the adjusting is adjusted
Member sends power up-regulation instruction to each subfield station by preset rules according to preset power regulation magnitude.
13. the system according to claim 8 or 12, it is characterised in that:
The execution unit that adjusts is for determining the subfield station of one or more implementable power regulations；And according to preset power
Magnitude is adjusted to transmit power control commands to the subfield station of one or more of implementable power regulations；
The adjusting execution unit is used in the subfield station of normal operation, is chosen response speed and is higher than pre-set velocity value and real hair
Power is greater than subfield station of the one or more subfield stations of predetermined power value as implementable power regulation.
14. system according to claim 8, it is characterised in that: the power monitoring unit is for being arranged power regulation throwing
Enter flag bit；
When transmitting power control commands to each subfield station, while it is 1 that power regulation investment flag bit, which is arranged,；
After section active power regulation, when the section active power value is restored to threshold interval, setting power regulation is thrown
Entering flag bit is 0.
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