CN110445195A - The method, apparatus and system that primary frequency regulation of power network and power distribution station imbalance are administered - Google Patents
The method, apparatus and system that primary frequency regulation of power network and power distribution station imbalance are administered Download PDFInfo
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- CN110445195A CN110445195A CN201910693025.7A CN201910693025A CN110445195A CN 110445195 A CN110445195 A CN 110445195A CN 201910693025 A CN201910693025 A CN 201910693025A CN 110445195 A CN110445195 A CN 110445195A
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses method, apparatus and system that a kind of primary frequency regulation of power network and power distribution station imbalance are administered, including obtain positive sequence network voltage frequency；The instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency；Processing is modulated to the instruction of positive sequence watt current, generates the control signal for the inverter power switch that control is connected with power grid.The present invention by acquiring grid side information of voltage in real time, calculate corresponding frequency information, the calculation formula for being then based on the positive sequence watt current instruction of setting obtains the instruction of positive sequence watt current, the control signal for the inverter power switch that control is connected with power grid is ultimately generated, control inverter participates in the primary frequency modulation of power grid.In addition, acquiring user side load current information and carrying out negative-sequence current compensation, improve the three-phase symmetrical degree of networking electric current, realizes that the uneven of power distribution station is administered.
Description
Technical field
The invention belongs to power grid regulation technical fields, and in particular to a kind of primary frequency regulation of power network is controlled with power distribution station imbalance
The method, apparatus and system of reason.
Background technique
China's low-voltage power distribution station area power consumer is numerous and distribution disperses, and it is unbalanced single-phase that there are a large amount of spatial and temporal distributions
Load causes most power distribution stations to there are problems that different degrees of three-phase load unbalance.Three-phase load unbalance bring master
Endangering has: 1) three-phase current unbalance seriously affects load supplying quality；2) out-of-balance current makes distribution transformer temperature liter
Height jeopardizes its service life；3) unbalanced three phase current reduces the power output of distribution transformer, energy conversion efficiency decline.
Summary of the invention
In view of the above-mentioned problems, proposing a kind of primary frequency regulation of power network the present invention is based on phase three-wire three NPC three-level topology structure
The method, apparatus and system administered with power distribution station imbalance are improved for reducing power distribution station three-phase load unbalance degree
Power distribution station economic operation level and supply voltage quality have important theory significance and practical value.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the invention is realized by the following technical scheme:
In a first aspect, the present invention provides a kind of primary frequency regulation of power network methods, comprising:
Obtain positive sequence network voltage frequency；
The instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency；
Processing is modulated to positive sequence watt current instruction, generates the inverter power switch that control is connected with power grid
Control signal.
Optionally, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
Optionally, the positive sequence network voltage frequency is obtained by following steps:
Obtain the positive and negative order components of network voltage；
The positive and negative order components for the network voltage that will acquire are sent into locking phase/frequency module, generate positive sequence network voltage frequency.
Optionally, described to be modulated processing to positive sequence watt current instruction, generation control is connected inverse with power grid
Become the control signal of device power switch, specifically:
The positive sequence watt current is instructed and is sent into modulating wave generation and pulse width modulation module, control is generated and is connected with power grid
Inverter power switch control signal.
Optionally, the positive sequence watt current instruction refers to for the inductive current positive sequence for the inductance that is connected with inverter output end
Signal.
Second aspect, the present invention provides a kind of power grids and power distribution station imbalance administering method, comprising:
To the negative phase-sequence inductive current of the inductance of the negative phase-sequence load current and the inverter output end being connected with power grid that get
PI control is carried out, negative-sequence current modulated signal is generated；
The instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency got；
Positive sequence inductive current, preset inductive current to the inductance of the inverter output end being connected with power grid got
Reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
The forward-order current modulated signal and negative-sequence current modulated signal are overlapped, and converted by anti-CLARK, is obtained
To reference voltage；
The inductive current of the inductance of DC capacitor voltage, inverter output end based on inverter input terminal and reference
Voltage generates residual voltage；
Modulated voltage signal is generated based on the reference voltage and residual voltage；
The control signal of control inverter power switch is generated based on the modulated voltage signal.
Optionally, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
Optionally, the DC capacitor voltage based on inverter input terminal, inverter output end inductance inductance electricity
Stream and reference voltage generate residual voltage, specifically:
Obtain the inductive current of the DC capacitor voltage of inverter input terminal, the inductance of inverter output end；
It brings the DC capacitor voltage, inductive current, reference voltage into following formula and calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsFor control week
Phase, vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCFor the inductive current of three-phase inverter output end, ssgna,ssgnc,
ssgncFor the sign function of reference voltage.
It is optionally, described that modulated voltage signal is generated based on the reference voltage and residual voltage, specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
Optionally, the positive sequence network voltage frequency is obtained by following steps:
The network voltage that will acquire sequentially carries out positive-negative sequence separation and locking phase/frequency processing, obtains positive-negative sequence network voltage
Phase and positive sequence network voltage frequency.
Optionally, the negative phase-sequence inductive current and positive sequence inductive current of the inductance of the inverter output end being connected with power grid
It is obtained by following steps:
Obtain the inductive current of inductance at the inverter output end being connected with power grid；
Park Transformation is carried out after inductive current progress positive-negative sequence separation, then with positive-negative sequence electric network voltage phase, is obtained
Obtain the negative phase-sequence inductive current and positive sequence inductive current of the inductance for the inverter output end being connected with power grid.
Optionally, the negative phase-sequence load current is obtained by following steps:
After the load current that will acquire carries out positive-negative sequence separation, then with negative phase-sequence electric network voltage phase Park Transformation is carried out,
Obtain the negative phase-sequence load current.
The third aspect, the present invention provides a kind of primary frequency regulation of power network devices, comprising:
First obtains module, for obtaining positive sequence network voltage frequency；
First computing module obtains the instruction of positive sequence watt current for the positive sequence network voltage frequency；
First modulation module generates control and power grid phase for being modulated processing to positive sequence watt current instruction
The control signal of inverter power switch even.
Fourth aspect, the present invention provides a kind of power grids and power distribution station imbalance controlling device, comprising:
First generation module, for the electricity to the negative phase-sequence load current and the inverter output end being connected with power grid that get
The negative phase-sequence inductive current of sense carries out PI control, generates negative-sequence current modulated signal；
Second computing module, for obtaining the instruction of positive sequence watt current according to the positive sequence network voltage frequency got；
Second generation module, the positive sequence inductance electricity for the inductance to the inverter output end being connected with power grid got
Stream, preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Third generation module, for being overlapped to the forward-order current modulated signal and negative-sequence current modulated signal, and
It is converted by anti-CLARK, generates reference voltage；
4th generation module, inductance for DC capacitor voltage, inverter output end based on inverter input terminal
Inductive current and reference voltage generate residual voltage；
5th generation module generates modulated voltage signal based on the reference voltage and residual voltage；
6th generation module generates the control signal of control inverter power switch based on the modulated voltage signal.
5th aspect, the present invention provides a kind of primary frequency regulation of power network systems, comprising:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed in first aspect and appoint
Step described in one.
6th aspect, the present invention provides a kind of primary frequency regulation of power network systems, comprising:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed in second aspect and appoint
Step described in one.
7th aspect, the present invention provides a kind of primary frequency regulation of power network system, including be sequentially connected voltage acquisition module,
Positive-negative sequence separation module, locking phase/frequency module and positive sequence watt current computing module；
The voltage acquisition module acquires network voltage in real time, and the positive-negative sequence separation module and locking phase/frequency module are to institute
It states network voltage and sequentially carries out positive-negative sequence separation and locking phase/frequency processing, generate positive-negative sequence electric network voltage phase and positive sequence power grid electricity
Voltage-frequency rate；The positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency.
Eighth aspect, the present invention provides a kind of power grids and power distribution station imbalance governing system, comprising:
Signal acquisition unit, the signal acquisition unit is for obtaining positive sequence network voltage frequency, DC capacitor voltage, bearing
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of sequence load current and the inverter output end being connected with power grid；
Positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency；
Forward-order current control module, to the positive sequence inductance electricity of the inductance of the inverter output end being connected with power grid got
Stream, preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Negative-sequence current control module, to the electricity of the negative phase-sequence load current and the inverter output end being connected with power grid that get
The negative phase-sequence inductive current of sense carries out PI control, generates negative-sequence current modulated signal；
Reference voltage generation module is overlapped the forward-order current modulated signal and negative-sequence current modulated signal, and
It is converted by anti-CLARK, obtains reference voltage；
Zero sequence modulation voltage computing module, DC capacitor voltage based on inverter input terminal, the inversion being connected with power grid
The inductive current and reference voltage of the inductance of device output end generate residual voltage；
Modulation voltage synthesis module generates modulated voltage signal based on the reference voltage and residual voltage；
Modulating wave generates and pulse width modulation module, generates control inverter power switch based on the modulated voltage signal
Control signal.
Optionally, described that residual voltage, tool are generated based on DC capacitor voltage, inverter output current and reference voltage
Body are as follows:
Obtain DC capacitor voltage, inverter output current；
Based on the DC capacitor voltage, inverter output current, reference voltage is raw and following formula calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsFor control week
Phase, vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCFor the inductive current of three-phase inverter output end, ssgna,ssgnc,
ssgncFor the sign function of reference voltage.
It is optionally, described that modulated voltage signal is generated based on the reference voltage and residual voltage, specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
Optionally, the signal acquisition unit includes load current acquisition module, the first positive-negative sequence separation module, the first group
Gram conversion module, voltage acquisition module, the second positive-negative sequence separation module, locking phase/frequency module, output current acquisition module, second
Park Transformation module, third positive-negative sequence separation module and capacitance voltage acquisition module；
The load current acquisition module acquires load current, and the load current is carried out through the first positive-negative sequence separation module
After positive-negative sequence separating treatment, negative phase-sequence electric network voltage phase is based on by the first Park Transformation module, Park Transformation is carried out to it, generated
Negative phase-sequence load current；
The voltage acquisition module acquires network voltage, and the second positive-negative sequence separation module carries out the network voltage
It is sent into locking phase/frequency module after positive-negative sequence separating treatment, obtains positive-negative sequence electric network voltage phase and positive-negative sequence network voltage frequency；
The inductive current of inductance, the third positive-negative sequence point at the output current acquisition module acquisition inverter output end
After carrying out positive-negative sequence separating treatment to the inductive current from module, positive-negative sequence power grid electricity is based on by the second Park Transformation module
Pressure phase carries out Park Transformation to it, generates positive-negative sequence inductive current；
The capacitance voltage acquisition module acquires DC capacitor voltage, and is sent to zero sequence modulation voltage computing module.
Compared with prior art, beneficial effects of the present invention:
The present invention calculates corresponding frequency information, is then based on setting by acquiring grid side information of voltage in real time
The calculation formula of positive sequence watt current instruction obtains the instruction of positive sequence watt current, ultimately generates the inversion that control is connected with power grid
The control signal of device power switch, control inverter participate in the primary frequency modulation of power grid, provide strong support to power grid, promoted simultaneously
Net friendly.
On the other hand, the present invention by accessing phase three-wire three NPC three-level topology knot in distribution transformer user side on the spot
The uneven controlling device (i.e. inverter) of structure acquires user side load current information and carries out negative-sequence current compensation, reduces
Power distribution station three-phase load unbalance degree improves the three-phase symmetrical degree of networking electric current, realizes that the uneven of power distribution station is administered.
Detailed description of the invention
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail, in which:
Fig. 1 is the power grid of an embodiment of the present invention and the structural schematic diagram of power distribution station imbalance governing system；
Fig. 2 is uneven one of the simulation result diagram administered in an embodiment of the present invention；
Fig. 3 is two of the uneven simulation result diagram administered in an embodiment of the present invention；
Fig. 4 is one of primary frequency modulation simulation result diagram in an embodiment of the present invention；
Fig. 5 is two of primary frequency modulation simulation result diagram in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
In limiting the scope of protection of the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, being connected with inverter on power grid, the input terminal of the inverter is equipped with input capacitance, output
End is equipped with inductance, and inverter input terminal is direct current signal, and it is pressure stabilization function that input power-up, which is held, and output end is AC signal, output
Coilloading is filter action, filters out the harmonic components of ac current signal.
Embodiment 1
A kind of primary frequency regulation of power network method is provided in the embodiment of the present invention, comprising:
(1) positive sequence network voltage frequency is obtained；
In a kind of specific embodiment of the embodiment of the present invention, the positive sequence network voltage frequency is obtained by following steps
:
Obtain network voltage ugABC, and carry out positive-negative sequence separation and calculate the corresponding positive and negative order components of network voltage of acquisition
ugABC+/ugABC-；
By the positive and negative order components u of network voltagegABC+/ugABC-It is sent into locking phase/frequency module and obtains positive-negative sequence electric network voltage phase
θg+/θg-And positive sequence network voltage frequency fg+；
(2) instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency；
In a kind of specific embodiment of the embodiment of the present invention, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
(3) processing is modulated to positive sequence watt current instruction, generates the inverter power that control is connected with power grid
The control signal of switch；
It is described that positive sequence watt current instruction is modulated in a kind of specific embodiment of the embodiment of the present invention
Processing generates the control signal for the inverter power switch that control is connected with power grid, specifically:
The positive sequence watt current is instructed and is sent into modulating wave generation and pulse width modulation module, wherein the positive sequence is active
Current-order is the inductive current positive sequence reference signal of inductance of being connected with inverter output end；
The modulating wave generates and pulse width modulation module generates the control that the inverter power that control is connected with power grid switchs
Signal.
Embodiment 2
A kind of power grid and power distribution station imbalance administering method are provided in the embodiment of the present invention, the power distribution station refers to
The supply district of (one) transformer or region, comprising:
(1) electric to the negative phase-sequence inductance of the inductance of the negative phase-sequence load current and the inverter output end being connected with power grid that get
Stream carries out PI control, generates negative-sequence current modulated signal；
In a kind of specific embodiment of the embodiment of the present invention, the negative phase-sequence load current is obtained by following steps:
Obtain load current ioABC, it is based on the load current ioABCIt carries out positive-negative sequence separation and calculates the corresponding load of acquisition
The positive and negative order components i of electric currentoABC+/ioABC-；
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of the inverter output end being connected with power grid by with
Lower step obtains:
Obtain the inductive current i of inductance at the inverter output end being connected with power gridLABC；
By the inductive current iLABCThe corresponding positive and negative order components of inductive current of acquisition are calculated after carrying out positive-negative sequence separation
iLABC+/iLABC-,
By positive-negative sequence electric network voltage phase θg+/θg-And iLABC+/iLABC-It is sent into the acquisition of the first Park Transformation module and power grid
The negative phase-sequence inductive current and positive sequence inductive current i of the inductance of connected inverter output endLdq+/iLdq-。
By negative phase-sequence electric network voltage phase θg-And ioABC-It is sent into the second Park Transformation module and obtains the negative phase-sequence load current
iodq-；
By the iodq-、iLdq-It is sent into negative-sequence current control module and obtains negative-sequence current modulated signal M-；In particular d,
PI control is carried out to the d axis of negative phase-sequence inductive current and q axis component under q axial coordinate, obtains negative-sequence current modulated signal M-；
(2) instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency got；
In a kind of specific embodiment of the embodiment of the present invention, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency；
In a kind of specific embodiment of the embodiment of the present invention, the positive sequence network voltage frequency is obtained by following steps
:
Obtain network voltage ugABC, and carry out positive-negative sequence separation and calculate the corresponding positive and negative order components of network voltage of acquisition
ugABC+/ugABC-；
By the positive and negative order components u of network voltagegABC+/ugABC-It is sent into locking phase/frequency module and obtains positive-negative sequence electric network voltage phase
θg+/θg-And positive sequence network voltage frequency fg+。
(3) the positive sequence inductive current to the inductance of the inverter output end being connected with power grid got, preset inductance
Current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
In a kind of specific embodiment of the embodiment of the present invention, the step (3) specifically:
By the positive sequence inductive current iLdq+, preset inductive current reference value iLqref+, positive sequence watt current instruction
iLdref+It is sent into forward-order current control module and obtains forward-order current modulated signal M+；The q axis component i of the inductive currentLqref+=
0
Specifically, the forward-order current control module is under d, q axial coordinate to positive sequence inductive current iLdq+D axis and q axis
Component carries out PI control, obtains forward-order current modulated signal；
(4) the forward-order current modulated signal and negative-sequence current modulated signal are overlapped, and become by anti-CLARK
It changes, obtains reference voltage；
In a kind of specific embodiment of the embodiment of the present invention, the step (4) specifically:
By forward-order current modulated signal M+With negative-sequence current modulated signal M-Reference voltage generation module is sent into obtain with reference to electricity
Press vra,vrb,vrc；Specifically, the reference voltage generation module is by forward-order current modulated signal M+With negative-sequence current modulated signal
M-It is overlapped, and is converted by anti-CLARK, obtain reference voltage；
(5) DC capacitor voltage based on inverter input terminal, the inductive current of the inductance of inverter output end, Yi Jican
It examines voltage and generates residual voltage；
In a kind of specific embodiment of the embodiment of the present invention, the step (5) specifically:
Obtain the inductive current of the DC capacitor voltage of inverter input terminal, the inductance of inverter output end；
It brings the DC capacitor voltage, inductive current, reference voltage into following formula and calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsFor control week
Phase, vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCFor the inductive current of three-phase inverter output end, ssgna,ssgnc,
ssgncFor the sign function of reference voltage.
(6) modulated voltage signal is generated based on the reference voltage and residual voltage；
In a kind of specific embodiment of the embodiment of the present invention, the step (6) specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
(7) the control signal of control inverter power switch is generated based on the modulated voltage signal.
In a kind of specific embodiment of the embodiment of the present invention, the step (7) specifically:
By three-phase modulations voltage signal vma,vmb,vmcIt is sent into modulating wave generation and pulse width modulation module acquisition generation control is inverse
The control signal D for becoming device power switch allows inverter to carry out hair function or inhales function.Specifically: the modulating wave generates and pulsewidth
Modulation module is PD-PWM/POD-PWM modulator (carrier wave is with phase pulsewidth modulation/carrier wave reverse phase pulse width modulation module).
Embodiment 3
Based on inventive concept same as Example 1, a kind of primary frequency regulation of power network device is provided in the embodiment of the present invention,
Include:
First obtains module, for obtaining positive sequence network voltage frequency；
First computing module, for obtaining the instruction of positive sequence watt current according to the positive sequence network voltage frequency；
First modulation module generates control and power grid phase for being modulated processing to positive sequence watt current instruction
The control signal of inverter power switch even.
Rest part is same as Example 1.
In a kind of specific embodiment of the embodiment of the present invention, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
Embodiment 4
Based on inventive concept same as Example 2, a kind of power grid and power distribution station are provided in the embodiment of the present invention not
Balance controlling device, comprising:
First generation module, for the electricity to the negative phase-sequence load current and the inverter output end being connected with power grid that get
The negative phase-sequence inductive current of sense carries out PI control, generates negative-sequence current modulated signal；
Second computing module, for obtaining the instruction of positive sequence watt current according to the positive sequence network voltage frequency got；
Second generation module, the positive sequence inductance electricity for the inductance to the inverter output end being connected with power grid got
Stream, preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Third generation module, for being overlapped to the forward-order current modulated signal and negative-sequence current modulated signal, and
It is converted by anti-CLARK, generates reference voltage；
4th generation module, inductance for DC capacitor voltage, inverter output end based on inverter input terminal
Inductive current and reference voltage generate residual voltage；
5th generation module generates modulated voltage signal based on the reference voltage and residual voltage；
6th generation module generates the control signal of control inverter power switch based on the modulated voltage signal.
In a kind of specific embodiment of the embodiment of the present invention, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
Rest part is same as Example 2.
Embodiment 5
Based on inventive concept same as Example 1, a kind of primary frequency regulation of power network system is provided in the embodiment of the present invention,
Include:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed any one of embodiment 1
The step.
Embodiment 6
Based on inventive concept same as Example 2, a kind of primary frequency regulation of power network system is provided in the embodiment of the present invention,
Include:
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for being loaded by processor and being executed embodiment 5-10 and appoints
Step described in one.
Embodiment 7
Based on inventive concept same as Example 1, a kind of primary frequency regulation of power network system is provided in the embodiment of the present invention,
Including voltage acquisition module, positive-negative sequence separation module, locking phase/frequency module and the positive sequence watt current computing module being sequentially connected；
The voltage acquisition module acquires network voltage in real time, and the positive-negative sequence separation module and locking phase/frequency module are to institute
It states network voltage and sequentially carries out positive-negative sequence separation and locking phase/frequency processing, generate positive-negative sequence electric network voltage phase and positive sequence power grid electricity
Voltage-frequency rate；The positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency.
Rest part is same as Example 1.
Embodiment 8
A kind of power grid and power distribution station imbalance governing system are provided in the embodiment of the present invention, comprising:
Signal acquisition unit, the signal acquisition unit is for obtaining positive sequence network voltage frequency, DC capacitor voltage, bearing
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of sequence load current and the inverter output end being connected with power grid；
Positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency；
Forward-order current control module, to the positive sequence inductance electricity of the inductance of the inverter output end being connected with power grid got
Stream, preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Negative-sequence current control module, to the electricity of the negative phase-sequence load current and the inverter output end being connected with power grid that get
The negative phase-sequence inductive current of sense carries out PI control, generates negative-sequence current modulated signal；
Reference voltage generation module is overlapped the forward-order current modulated signal and negative-sequence current modulated signal, and
It is converted by anti-CLARK, obtains reference voltage；
Zero sequence modulation voltage computing module, DC capacitor voltage based on inverter input terminal, the inversion being connected with power grid
The inductive current and reference voltage of the inductance of device output end generate residual voltage；
Modulation voltage synthesis module generates modulated voltage signal based on the reference voltage and residual voltage；
Modulating wave generates and pulse width modulation module, generates control inverter power switch based on the modulated voltage signal
Control signal.
Optionally, the calculation formula of the positive sequence watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
Optionally, described that residual voltage, tool are generated based on DC capacitor voltage, inverter output current and reference voltage
Body are as follows:
Obtain DC capacitor voltage, inverter output current；
Based on the DC capacitor voltage, inverter output current, reference voltage is raw and following formula calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsFor control week
Phase, vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCElectric current, s are exported for three-phase invertersgna,ssgnc,ssgncFor reference
The sign function of voltage.
It is optionally, described that modulated voltage signal is generated based on the reference voltage and residual voltage, specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
Optionally, the signal acquisition unit includes load current acquisition module, the first positive-negative sequence separation module, the first group
Gram conversion module, voltage acquisition module, the second positive-negative sequence separation module, locking phase/frequency module, output current acquisition module, second
Park Transformation module, third positive-negative sequence separation module and capacitance voltage acquisition module；
The load current acquisition module acquires load current, and the load current is carried out through the first positive-negative sequence separation module
After positive-negative sequence separating treatment, negative phase-sequence electric network voltage phase is based on by the first Park Transformation module, Park Transformation is carried out to it, generated
Negative phase-sequence load current；
The voltage acquisition module acquires network voltage, and the second positive-negative sequence separation module carries out the network voltage
It is sent into locking phase/frequency module after positive-negative sequence separating treatment, obtains positive-negative sequence electric network voltage phase and positive-negative sequence network voltage frequency；
The inductive current of inductance, the third positive-negative sequence point at the output current acquisition module acquisition inverter output end
After carrying out positive-negative sequence separating treatment to the inductive current from module, positive-negative sequence power grid electricity is based on by the second Park Transformation module
Pressure phase carries out Park Transformation to it, generates positive-negative sequence inductive current；
The capacitance voltage acquisition module acquires DC capacitor voltage, and is sent to zero sequence modulation voltage computing module.
Correctness and feasibility to illustrate the invention control the primary frequency regulation of power network and power distribution station imbalance that are proposed
Reason method, apparatus and system have carried out emulation experiment verifying.Emulate operating condition one: the three-phase of initial time power distribution station access is negative
Lotus be respectively it is fully loaded, unloaded and unloaded, 0.2s Shi Youyi phase zero load is cut to fully loaded, and each signal waveform is as follows.Fig. 2 is provided
Under above-mentioned simulated conditions, three-phase grid current waveform (on) and three-phase load electric current (under) waveform；Fig. 3 gives above-mentioned imitative
Under the conditions of true, out-of-balance load negative-sequence current (on) and networking electric current negative sequence component waveform (under), waveform is shown: working as imbalance
When controlling device main circuit is the NPC three-level inverter of phase three-wire three structure, when being controlled respectively using positive-negative sequence current, energy
Enough negative sequence components for effectively inhibiting networking electric current, so that networking current three-phase is symmetrical.
Emulate operating condition two: initial time mains frequency is 50Hz, and mains frequency sports 49.5Hz, Fig. 4 by 50Hz when 2s
Provide mains frequency waveform, Fig. 5 provides system output power waveform, and waveform is shown: when mains frequency reduces, power grid is primary
Frequency modulation and power distribution station imbalance controlling device can automated to respond to mains frequency variation, increase active power output.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions each in flowchart and/or the block diagram
The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computers
Processor of the program instruction to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
To generate a machine, so that generating use by the instruction that computer or the processor of other programmable data processing devices execute
In the function that realization is specified in one or more flows of the flowchart and/or one or more blocks of the block diagram
Device.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that instruction stored in the computer readable memory generation includes
The manufacture of command device, the command device are realized in one box of one or more flows of the flowchart and/or block diagram
Or the function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer
Or the instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or box
The step of function of being specified in figure one box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
Can with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from spirit and scope of the invention appoint
What modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (22)
1. a kind of primary frequency regulation of power network method characterized by comprising
Obtain positive sequence network voltage frequency；
The instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency；
Processing is modulated to positive sequence watt current instruction, generates the control for the inverter power switch that control is connected with power grid
Signal processed.
2. a kind of primary frequency regulation of power network method according to claim 1, it is characterised in that: the positive sequence watt current instruction
Calculation formula are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
3. a kind of primary frequency regulation of power network method according to claim 1, it is characterised in that: the positive sequence network voltage frequency
It is obtained by following steps:
Obtain the positive and negative order components of network voltage；
The positive and negative order components for the network voltage that will acquire are sent into locking phase/frequency module, generate positive sequence network voltage frequency.
4. a kind of primary frequency regulation of power network method according to claim 1, it is characterised in that: described to the active electricity of the positive sequence
Stream instruction is modulated processing, generates the control signal for the inverter power switch that control is connected with power grid, specifically:
The positive sequence watt current is instructed and is sent into modulating wave generation and pulse width modulation module, generation control is connected inverse with power grid
Become the control signal of device power switch.
5. a kind of primary frequency regulation of power network method according to claim 1, it is characterised in that: the positive sequence watt current instruction
For the inductive current positive sequence reference signal for the inductance that is connected with inverter output end.
6. a kind of power grid and power distribution station imbalance administering method characterized by comprising
The negative phase-sequence inductive current of the inductance of the negative phase-sequence load current and the inverter output end being connected with power grid that get is carried out
PI control, generates negative-sequence current modulated signal；
The instruction of positive sequence watt current is obtained according to the positive sequence network voltage frequency got；
Positive sequence inductive current, the preset inductive current of the inductance of the inverter output end being connected with power grid got are referred to
Value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
The forward-order current modulated signal and negative-sequence current modulated signal are overlapped, and converted by anti-CLARK, is joined
Examine voltage；
The inductive current and reference voltage of the inductance of DC capacitor voltage, inverter output end based on inverter input terminal
Generate residual voltage；
Modulated voltage signal is generated based on the reference voltage and residual voltage；
The control signal of control inverter power switch is generated based on the modulated voltage signal.
7. a kind of power grid according to claim 6 and power distribution station imbalance administering method, it is characterised in that: the positive sequence
The calculation formula of watt current instruction are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
8. a kind of power grid according to claim 6 and power distribution station imbalance administering method, it is characterised in that: described to be based on
The DC capacitor voltage of inverter input terminal, the inductive current of the inductance of inverter output end and reference voltage generate zero sequence
Voltage, specifically:
Obtain the inductive current of the DC capacitor voltage of inverter input terminal, the inductance of inverter output end；
It brings the DC capacitor voltage, inductive current, reference voltage into following formula and calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsTo control the period,
vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCFor the inductive current of three-phase inverter output end, ssgna,ssgnc,ssgncFor
The sign function of reference voltage.
9. a kind of power grid according to claim 5 and power distribution station imbalance administering method, it is characterised in that: described to be based on
The reference voltage and residual voltage generate modulated voltage signal, specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
10. a kind of power grid according to claim 5 and power distribution station imbalance administering method, the positive sequence network voltage frequency
Rate is obtained by following steps:
The network voltage that will acquire sequentially carries out positive-negative sequence separation and locking phase/frequency processing, obtains positive-negative sequence electric network voltage phase
And positive sequence network voltage frequency.
11. a kind of power grid according to claim 8 and power distribution station imbalance administering method, it is characterised in that: it is described with
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of the connected inverter output end of power grid are obtained by following steps:
Obtain the inductive current of inductance at the inverter output end being connected with power grid；
By the inductive current carry out positive-negative sequence separation after, then with positive-negative sequence electric network voltage phase carry out Park Transformation, obtain with
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of the connected inverter output end of power grid.
12. a kind of power grid according to claim 5 and power distribution station imbalance administering method, it is characterised in that: described negative
Sequence load current is obtained by following steps:
After the load current that will acquire carries out positive-negative sequence separation, then with negative phase-sequence electric network voltage phase Park Transformation is carried out, obtained
The negative phase-sequence load current.
13. a kind of primary frequency regulation of power network device characterized by comprising
First obtains module, for obtaining positive sequence network voltage frequency；
First computing module, for obtaining the instruction of positive sequence watt current according to the positive sequence network voltage frequency；
First modulation module generates what control was connected with power grid for being modulated processing to positive sequence watt current instruction
The control signal of inverter power switch.
14. a kind of power grid and power distribution station imbalance controlling device characterized by comprising
First generation module, for the inductance to the negative phase-sequence load current and the inverter output end being connected with power grid that get
Negative phase-sequence inductive current carries out PI control, generates negative-sequence current modulated signal；
Second computing module, for obtaining the instruction of positive sequence watt current according to the positive sequence network voltage frequency got；
Second generation module, for the inductance to the inverter output end being connected with power grid got positive sequence inductive current,
Preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Third generation module for being overlapped to the forward-order current modulated signal and negative-sequence current modulated signal, and passes through
Anti- CLARK transformation, generates reference voltage；
4th generation module, the inductance of the inductance for DC capacitor voltage, inverter output end based on inverter input terminal
Electric current and reference voltage generate residual voltage；
5th generation module generates modulated voltage signal based on the reference voltage and residual voltage；
6th generation module generates the control signal of control inverter power switch based on the modulated voltage signal.
15. a kind of primary frequency regulation of power network system characterized by comprising
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for by processor load and perform claim requires any one of 1-4
The step.
16. a kind of primary frequency regulation of power network system characterized by comprising
Processor is adapted for carrying out each instruction；And
Equipment is stored, is suitable for storing a plurality of instruction, described instruction is suitable for by processor load and perform claim requires 5-10 any
Step described in.
17. a kind of primary frequency regulation of power network system, it is characterised in that: including be sequentially connected voltage acquisition module, positive-negative sequence separation
Module, locking phase/frequency module and positive sequence watt current computing module；
The voltage acquisition module acquires network voltage in real time；
The positive-negative sequence separation module and locking phase/frequency module sequentially carry out positive-negative sequence separation and locking phase/frequency to the network voltage
Processing generates positive-negative sequence electric network voltage phase and positive sequence network voltage frequency；
The positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency.
18. a kind of power grid and power distribution station imbalance governing system characterized by comprising
Signal acquisition unit, the signal acquisition unit are negative for obtaining positive sequence network voltage frequency, DC capacitor voltage, negative phase-sequence
The negative phase-sequence inductive current and positive sequence inductive current of the inductance of charged current and the inverter output end being connected with power grid；
Positive sequence watt current computing module obtains the instruction of positive sequence watt current according to the positive sequence network voltage frequency；
Forward-order current control module, to the positive sequence inductive current of the inductance of the inverter output end being connected with power grid got,
Preset inductive current reference value and the instruction of positive sequence watt current carry out PI control, generate forward-order current modulated signal；
Negative-sequence current control module, to the inductance of the negative phase-sequence load current and the inverter output end being connected with power grid that get
Negative phase-sequence inductive current carries out PI control, generates negative-sequence current modulated signal；
Reference voltage generation module is overlapped the forward-order current modulated signal and negative-sequence current modulated signal, and passes through
Anti- CLARK transformation, obtains reference voltage；
Zero sequence modulation voltage computing module, DC capacitor voltage based on inverter input terminal, the inverter being connected with power grid are defeated
The inductive current and reference voltage of the inductance of outlet generate residual voltage；
Modulation voltage synthesis module generates modulated voltage signal based on the reference voltage and residual voltage；
Modulating wave generates and pulse width modulation module, and the control of control inverter power switch is generated based on the modulated voltage signal
Signal.
19. power grid according to claim 18 and power distribution station imbalance governing system, it is characterised in that: the positive sequence has
The calculation formula of function current-order are as follows:
iLdref+=[fn-fg+]·Dp
Wherein, fnFor specified mains frequency, DqFor the sagging coefficient of positive sequence watt current, fg+For positive sequence network voltage frequency.
20. power grid according to claim 18 and power distribution station imbalance governing system, it is characterised in that: described based on straight
It flows capacitance voltage, inverter output current and reference voltage and generates residual voltage, specifically:
Obtain DC capacitor voltage, inverter output current；
Based on the DC capacitor voltage, inverter output current, reference voltage is raw and following formula calculates residual voltage:
In formula: v0For residual voltage, CdcFor direct current capacitance, Udc1And Udc2For DC capacitor voltage value, TsTo control the period,
vra,vrb,vrcFor three-phase reference voltage, iLA,iLB,iLCFor the inductive current of three-phase inverter output end, ssgna,ssgnc,ssgncFor
The sign function of reference voltage.
21. power grid according to claim 18 and power distribution station imbalance governing system, it is characterised in that: described to be based on institute
It states reference voltage and residual voltage generates modulated voltage signal, specifically:
Modulated voltage signal is calculated based on the reference voltage, residual voltage and following formula:
In formula, vra,vrb,vrcFor three-phase reference voltage, vma,vmb,vmcFor three-phase modulations voltage, v0For residual voltage.
22. a kind of power grid according to claim 18 and power distribution station imbalance governing system, it is characterised in that: the letter
Number acquisition unit includes load current acquisition module, the first positive-negative sequence separation module, the first Park Transformation module, voltage acquisition mould
Block, the second positive-negative sequence separation module, locking phase/frequency module, output current acquisition module, the second Park Transformation module, third are positive and negative
Sequence separation module and capacitance voltage acquisition module；
The load current acquisition module acquires load current, and the load current carries out positive and negative through the first positive-negative sequence separation module
After sequence separating treatment, negative phase-sequence electric network voltage phase is based on by the first Park Transformation module and carries out Park Transformation to it, generates negative phase-sequence
Load current；
The voltage acquisition module acquires network voltage, and the second positive-negative sequence separation module carries out the network voltage positive and negative
It is sent into locking phase/frequency module after sequence separating treatment, obtains positive-negative sequence electric network voltage phase and positive-negative sequence network voltage frequency；
The inductive current of inductance, the third positive-negative sequence splitting die at the output current acquisition module acquisition inverter output end
After block carries out positive-negative sequence separating treatment to the inductive current, positive-negative sequence electric network voltage phase is based on by the second Park Transformation module
Park Transformation is carried out to it, generates positive-negative sequence inductive current；
The capacitance voltage acquisition module acquires DC capacitor voltage, and is sent to zero sequence modulation voltage computing module.
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