CN113595154A - Wind turbine generator system power grid inertia frequency modulation method and system - Google Patents
Wind turbine generator system power grid inertia frequency modulation method and system Download PDFInfo
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- CN113595154A CN113595154A CN202110828911.3A CN202110828911A CN113595154A CN 113595154 A CN113595154 A CN 113595154A CN 202110828911 A CN202110828911 A CN 202110828911A CN 113595154 A CN113595154 A CN 113595154A
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- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 40
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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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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- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a method and a system for adjusting frequency of power grid inertia of a wind turbine generator, which change electromagnetic torque of the wind turbine generator and simultaneously increase the charging and discharging of bus capacitance of a frequency converter of the wind turbine generator to better and quickly respond to power grid frequency fluctuation.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method and a system for adjusting frequency of power grid inertia of a wind turbine generator.
Background
The adaptability of the wind turbine generator to the power grid is an important index for evaluating the performance of the wind turbine generator. When the power grid frequency fluctuates, the wind turbine generator needs to be adjusted to adapt to the power grid frequency fluctuation and assist the power grid frequency to recover to a rated stable value.
The power grid frequency fluctuation is divided into two cases of the power grid frequency being higher than the rated frequency and lower than the rated frequency. When the power grid frequency is higher than the rated frequency, the wind turbine generator is required to absorb energy from the power grid, so that the power grid frequency is reduced and recovered to the rated frequency; when the frequency of the power grid is lower than the rated frequency, the wind turbine generator is required to additionally output certain power to the power grid, the power grid is compensated, and the frequency of the power grid is improved and recovered to the rated frequency. At present, for two situations, the mode of changing the electromagnetic torque is adopted during inertia frequency modulation, and the size of the electromagnetic torque is correspondingly increased or reduced according to the increasing or decreasing degree of the power grid frequency, so that the requirement of adapting to the power grid frequency change is met. At present, the mode of adjusting the electromagnetic torque is realized by changing the output voltage of the frequency converter, the response speed and the response capability of the frequency converter are limited by the output capability of the frequency converter, the frequency change of a power grid cannot be quickly and accurately responded, and the defect needs to be compensated by an additional mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wind turbine generator power grid inertia frequency modulation method, which can respond to the change of the power grid frequency more quickly during inertia frequency modulation by charging and discharging a bus capacitor of a wind turbine generator frequency converter on the basis of changing the electromagnetic torque of the wind turbine generator, assist the power grid frequency to recover to the rated frequency more quickly and realize that the wind turbine generator smoothly passes through the power grid inertia frequency modulation.
The invention also provides a wind turbine generator system power grid inertia frequency modulation system.
The first purpose of the invention is realized by the following technical scheme: a wind turbine generator system power grid inertia frequency modulation method is characterized in that when inertia frequency modulation is carried out, electromagnetic torque of a wind turbine generator system is changed, and bus capacitance charging and discharging of a wind turbine generator system frequency converter are increased to better and quickly respond to power grid frequency fluctuation; firstly, energy fluctuation of the wind turbine generator during power grid inertia frequency modulation is counted and calculated and analyzed to increase the bus capacitance of the frequency converter, so that the wind turbine generator can store enough energy at a non-power grid inertia frequency modulation stage, then the electromagnetic torque of the wind turbine generator is changed, and the bus capacitance is buffered, namely, the charging and discharging are carried out to rapidly respond to the power grid frequency fluctuation, and the specific operation is as follows: when the frequency of the power grid is reduced, the electromagnetic torque and the bus capacitor are increased to release energy, and when the frequency of the power grid is increased, the electromagnetic torque and the bus capacitor are reduced to absorb redundant energy, so that the change of the frequency of the power grid can be responded to more quickly during inertia frequency modulation, the frequency of the power grid is assisted to be recovered to the rated frequency more quickly, and the wind turbine generator smoothly passes through the inertia frequency modulation of the power grid.
Further, the wind turbine generator system power grid inertia frequency modulation method comprises the following steps:
1) obtaining real-time frequency of power grid side of wind turbine generator
Acquiring real-time frequency of a power grid through a frequency converter, if the current power grid frequency deviates from a rated frequency, enabling the wind turbine generator to enter an inertia frequency modulation stage, and calculating power which needs to be additionally provided or received by the wind turbine generator according to the positive and negative values and the magnitude of the frequency deviation;
2) bus capacitor provided energy cache of frequency converter and wind turbine generator power compensation power grid
According to the frequency change of the power grid side, the power change of charging and discharging of the capacitor can be obtained according to the size of the bus capacitor, the power fluctuation caused by the power grid frequency change is compensated by changing the electromagnetic torque of the wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, the requirement of the wind turbine generator side on power change is compensated, the compensation power is generated more quickly, and the power grid frequency change is responded.
Further, in the step 1), power grid data are periodically acquired through a frequency converter, data are acquired once in each control period, the acquired data comprise the voltage frequency and the frequency change rate of the power grid side, and when the frequency change rate of the power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
Further, in step 2), when the power grid frequency is lower than the rated frequency, the wind turbine needs to additionally output preset power to the power grid, so that the power grid frequency is increased and restored to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
The second purpose of the invention is realized by the following technical scheme: a wind turbine generator system power grid inertia frequency modulation system comprises:
the wind turbine generator system comprises a frequency converter, a power grid real-time frequency acquisition module, an inertia frequency modulation stage and a power output module, wherein the frequency converter is used for acquiring the real-time frequency of a power grid;
the power compensation power grid module can obtain the power change of charging and discharging of the capacitor according to the frequency change of the power grid side and the size of the bus capacitor, compensates power fluctuation caused by the power grid frequency change by changing the electromagnetic torque of the wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, compensates the requirement of the power change of the power grid side of the wind turbine generator, generates compensation power more quickly and responds to the power grid frequency change.
Further, in the power grid real-time frequency acquisition module, power grid data are periodically acquired through a frequency converter, data are acquired once in each control period, the acquired data comprise power grid side voltage frequency and frequency change rate, and when the frequency change rate of the power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
Further, in the power compensation grid module, when the grid frequency is lower than the rated frequency, the wind turbine needs to additionally output a preset power to the grid, so as to increase the grid frequency and restore the grid frequency to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, on the basis of changing the electromagnetic torque of the wind turbine generator, the extra power required by restoring to the rated power when the power grid frequency fluctuates is provided in time through capacitance charging and discharging, and compared with the traditional scheme of simply changing the electromagnetic torque of the wind turbine generator, the method can respond to the change of the power grid frequency more quickly when the inertia frequency is modulated, and assists the power grid frequency to restore to the rated frequency more quickly.
2. The invention uses the bus capacitor of the frequency converter to provide power, and can reduce the change of the electromagnetic torque of the wind turbine generator, thereby reducing the load of the wind turbine generator and increasing the life cycle of the wind turbine generator.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is an architecture diagram of the system of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The embodiment provides a wind turbine generator power grid inertia frequency modulation method, and as shown in fig. 1, the method changes the electromagnetic torque of a wind turbine generator during inertia frequency modulation, and increases the charging and discharging of a bus capacitor of a wind turbine generator frequency converter to better and quickly respond to the power grid frequency fluctuation; firstly, energy fluctuation of the wind turbine generator during power grid inertia frequency modulation is counted and calculated and analyzed to increase the bus capacitance of the frequency converter, so that the wind turbine generator can store enough energy at a non-power grid inertia frequency modulation stage, then the electromagnetic torque of the wind turbine generator is changed, and the bus capacitance is buffered, namely, the charging and discharging are carried out to rapidly respond to the power grid frequency fluctuation, and the specific operation is as follows: when the frequency of the power grid is reduced, the electromagnetic torque and the bus capacitance are increased to release energy, and when the frequency of the power grid is increased, the electromagnetic torque and the bus capacitance are reduced to absorb redundant energy, so that the change of the frequency of the power grid can be responded to more quickly during inertia frequency modulation, the frequency of the power grid is assisted to be recovered to the rated frequency more quickly, and the wind turbine generator can smoothly pass through the inertia frequency modulation of the power grid; which comprises the following steps:
1) obtaining real-time frequency of power grid side of wind turbine generator
Acquiring real-time frequency of a power grid through a frequency converter, if the current power grid frequency deviates from a rated frequency, enabling the wind turbine generator to enter an inertia frequency modulation stage, and calculating power which needs to be additionally provided or received by the wind turbine generator according to the positive and negative values and the magnitude of the frequency deviation; the method comprises the steps that power grid data are collected periodically through a frequency converter, data are collected once in each control period, the collected data comprise the voltage frequency and the frequency change rate of a power grid side, and when the frequency change rate of the power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
2) Bus capacitor provided energy cache of frequency converter and wind turbine generator power compensation power grid
According to the frequency change of the power grid side, the power change of charging and discharging of the capacitor can be obtained according to the size of the bus capacitor, the power fluctuation caused by the power grid frequency change is compensated by changing the electromagnetic torque of the wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, the requirement of the side power change of the wind turbine generator is compensated, the compensation power is generated more quickly, the power grid frequency change is responded, and the specific conditions are as follows:
when the power grid frequency is lower than the rated frequency, the wind turbine generator is required to additionally output preset power to the power grid, the power grid frequency is improved, and the power grid frequency is recovered to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
Example 2
The embodiment provides a wind turbine generator system power grid inertia frequency modulation system, and as shown in fig. 2, the system includes the following two functional modules:
the wind turbine generator system comprises a frequency converter, a power grid real-time frequency acquisition module, an inertia frequency modulation stage and a power output module, wherein the frequency converter is used for acquiring the real-time frequency of a power grid; the module periodically collects power grid data through a frequency converter, data are collected once in each control period, the collected data comprise power grid side voltage frequency and frequency change rate, and when the frequency change rate of a power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
The power compensation power grid module can obtain the power change of charging and discharging with a capacitor according to the frequency change of the power grid side and the size of a bus capacitor, compensates power fluctuation caused by power grid frequency change by changing the electromagnetic torque of a wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, compensates the requirement of the power change of the power grid side of the wind turbine generator, generates compensation power more quickly, responds to the power grid frequency change, and has the following specific conditions:
when the power grid frequency is lower than the rated frequency, the wind turbine generator is required to additionally output preset power to the power grid, the power grid frequency is improved, and the power grid frequency is recovered to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A wind turbine generator system power grid inertia frequency modulation method is characterized in that when inertia frequency modulation is carried out, the method changes the electromagnetic torque of a wind turbine generator system, and meanwhile, bus capacitance charging and discharging of a wind turbine generator system frequency converter are increased to better carry out quick response on power grid frequency fluctuation; firstly, energy fluctuation of the wind turbine generator during power grid inertia frequency modulation is counted and calculated and analyzed to increase the bus capacitance of the frequency converter, so that the wind turbine generator can store enough energy at a non-power grid inertia frequency modulation stage, then the electromagnetic torque of the wind turbine generator is changed, and the bus capacitance is buffered, namely, the charging and discharging are carried out to rapidly respond to the power grid frequency fluctuation, and the specific operation is as follows: when the frequency of the power grid is reduced, the electromagnetic torque and the bus capacitor are increased to release energy, and when the frequency of the power grid is increased, the electromagnetic torque and the bus capacitor are reduced to absorb redundant energy, so that the change of the frequency of the power grid can be responded to more quickly during inertia frequency modulation, the frequency of the power grid is assisted to be recovered to the rated frequency more quickly, and the wind turbine generator smoothly passes through the inertia frequency modulation of the power grid.
2. The frequency modulation method for the power grid inertia of the wind turbine generator according to claim 1, characterized by comprising the following steps:
1) obtaining real-time frequency of power grid side of wind turbine generator
Acquiring real-time frequency of a power grid through a frequency converter, if the current power grid frequency deviates from a rated frequency, enabling the wind turbine generator to enter an inertia frequency modulation stage, and calculating power which needs to be additionally provided or received by the wind turbine generator according to the positive and negative values and the magnitude of the frequency deviation;
2) bus capacitor provided energy cache of frequency converter and wind turbine generator power compensation power grid
According to the frequency change of the power grid side, the power change of charging and discharging of the capacitor can be obtained according to the size of the bus capacitor, the power fluctuation caused by the power grid frequency change is compensated by changing the electromagnetic torque of the wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, the requirement of the wind turbine generator side on power change is compensated, the compensation power is generated more quickly, and the power grid frequency change is responded.
3. The frequency modulation method for the power grid inertia of the wind turbine generator according to claim 2, characterized in that: in the step 1), power grid data are periodically acquired through a frequency converter, data are acquired once in each control period, the acquired data comprise the voltage frequency and the frequency change rate of the power grid side, and when the frequency change rate of the power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
4. The frequency modulation method for the power grid inertia of the wind turbine generator according to claim 2, characterized in that: in step 2), when the power grid frequency is lower than the rated frequency, the wind turbine generator is required to additionally output preset power to the power grid, so that the power grid frequency is improved and restored to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
5. The utility model provides a wind turbine generator system electric wire netting inertia frequency modulation system which characterized in that includes:
the wind turbine generator system comprises a frequency converter, a power grid real-time frequency acquisition module, an inertia frequency modulation stage and a power output module, wherein the frequency converter is used for acquiring the real-time frequency of a power grid;
the power compensation power grid module can obtain the power change of charging and discharging of the capacitor according to the frequency change of the power grid side and the size of the bus capacitor, compensates power fluctuation caused by the power grid frequency change by changing the electromagnetic torque of the wind turbine generator and the power absorbed or released during the charging and discharging of the capacitor, compensates the requirement of the power change of the power grid side of the wind turbine generator, generates compensation power more quickly and responds to the power grid frequency change.
6. The wind turbine generator system power grid inertia frequency modulation system according to claim 5, wherein: in the power grid real-time frequency acquisition module, power grid data are periodically acquired through a frequency converter, data are acquired once in each control period, the acquired data comprise the voltage frequency and the frequency change rate of a power grid side, and when the frequency change rate of the power grid is detected to be larger than a preset threshold value, an inertia frequency modulation stage is started.
7. The wind turbine generator system power grid inertia frequency modulation system according to claim 5, wherein: in the power compensation power grid module, when the power grid frequency is lower than the rated frequency, the wind turbine generator is required to additionally output preset power to the power grid, so that the power grid frequency is improved and restored to the rated frequency: according to the reduction rate of the power grid frequency, the electromagnetic torque of the wind turbine generator is correspondingly increased, the output power of the generator is improved, and in addition, the bus capacitor of the frequency converter releases power, the extra power required by the power grid is rapidly output, so that the power grid frequency is improved to the rated frequency; when the frequency of the power grid is higher than the rated frequency, the wind turbine generator is required to additionally absorb preset power from the power grid, the frequency of the power grid is reduced, the frequency of the power grid is recovered to the rated frequency, the electromagnetic torque of the wind turbine generator is correspondingly reduced according to the increasing rate of the frequency of the power grid, the output power of the wind turbine generator is reduced, in addition, the bus capacitor of the frequency converter absorbs power, the additional power required to be released by the power grid is quickly absorbed, the frequency of the power grid is reduced to the rated frequency, and the requirement of quickly responding to the change of the frequency of the power grid is met.
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