CN111162544B - New energy power generation control system - Google Patents
New energy power generation control system Download PDFInfo
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- CN111162544B CN111162544B CN202010009919.2A CN202010009919A CN111162544B CN 111162544 B CN111162544 B CN 111162544B CN 202010009919 A CN202010009919 A CN 202010009919A CN 111162544 B CN111162544 B CN 111162544B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous 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
- 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
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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
- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a new energy power generation control system, which comprises: the amplitude limiting module is used for carrying out power limitation and releasing power limitation; an amplification module for performing power increase; the power observation module is used for observing the output power of a generator in the generator set; the voltage division module divides voltage corresponding to the power of the amplification part; the voltage phase modulation module is used for carrying out phase modulation on the amplified voltage; the current phase modulation module is used for phase modulating the current; the generator phase modulation module is used for configuring the amplified voltage to a rectifier of a fault generator; the bus adjusting module is matched with the generator phase adjusting module to output the adjusted voltage output by the rectifier of the fault motor to the direct current collector of the motor set; the invention compensates the voltage and the power of the fault generator through the amplified voltage brought by the amplified power, so that the fault generator can be self-adjusted when the fault occurs, and the amplification state of the non-fault generator can be adjusted according to the fault condition of the fault generator in the self-adjustment process.
Description
Technical Field
The invention relates to the field of new energy power generation, in particular to a new energy power generation control system.
Background
Based on the national conditions of reverse distribution of energy resources and load demands, the national grid company puts forward a strategic goal of building 'development of extra-high voltage alternating current transmission and construction of a strong national grid', the extra-high voltage grid has the characteristics of long distance, large scale, high efficiency and the like, the development of large coal power, large hydropower, large nuclear power and large renewable energy bases is promoted, and the method has important significance for realizing resource optimization configuration in the national range. The voltage level of the ultra-high voltage alternating current transmission line is high, capacitive charging power generated by a line capacitor of unit length is remarkably increased, and when the tail end of the line is in no load or light load, the tail end of the line can generate a voltage rising phenomenon. Overvoltage will be generated after the line fault, which also brings harm to the safety and stability of the equipment or the system. With the increasing construction of extra-high voltage transmission projects, the electric energy transmitted by the power grid is greatly improved, and meanwhile, the electric quantity transmitted by the power grid can possibly change at any time, so that higher requirements are provided for the reactive power balance and the effective control of voltage of the line.
Generally speaking, the voltage stability problem generally exists in a regional power grid with a large load, but with large-scale grid connection of new energy such as photovoltaic and wind power in a sending-end power grid, a large amount of conventional power sources are replaced by extrusion, so that the dynamic reactive power supporting capability of the power grid is greatly reduced, for example, in the northwest region of China, a million kilowatt photovoltaic base exists, and only a small amount of synchronous machine power sources exist in the power grid, so that the voltage stability problem in a local region is prominent, and the load node voltage is difficult to recover in the transient process under the large disturbance impact such as extra-high voltage direct current continuous commutation failure, and the like, and adverse effects are brought to the safe and stable operation of a system.
The phase modulator is used as a large-capacity, rapid and dynamic reactive compensation device, is applied to a multi-feed-in ultra-high voltage direct current receiving end power grid in China, and has good effects of inhibiting direct current commutation failure and improving the voltage stability level of the receiving end power grid. At present, most of dynamic reactive power optimization configuration researches for improving the transient voltage stability level focus on installation site optimization based on post-fault limit cutting time, transient voltage drop, acceptability index and trajectory sensitivity, and a certain phase difference is generated between the phase of a fault generator and an original generator set due to the difference of the numerical values of the generator body between the phase modifier and the generator set, so that the fluctuation of the power generated by the whole generator set is generated when the power generated by the generator is compensated.
Disclosure of Invention
The purpose of the invention is as follows:
the invention provides a new energy power generation control system, aiming at the problems that dynamic reactive power optimization configuration research for improving the transient voltage stability level mostly focuses on installation site optimization based on post-fault limit cutting time, transient voltage drop, acceptability index and trajectory sensitivity, and a certain phase difference is generated between a phase modifier and an original motor set when the phase modifier is subjected to phase modification of a fault generator and the original motor set due to the difference of numerical values of the motor body between the phase modifier and the generator set, so that power fluctuation is generated in the whole motor set when the generated power of the generator is compensated.
The technical scheme is as follows:
a new energy power generation control system for controlling a new energy power grid to stably generate power and return to stability in the event of a fault, comprising:
the amplitude limiting module is used for limiting the power of a generator in the generator set and releasing the power limitation;
the amplitude limiting module is used for increasing the power after the power limit of the generator is removed;
the power observation module is used for observing the output power of a generator in the generator set and uploading the output power to a fault motor;
the voltage division module is used for dividing the voltage corresponding to the power of the amplified part after the amplification module amplifies the generator without the fault;
the voltage phase modulation module is used for carrying out phase modulation of the amplified voltage according to the voltage phase difference between the fault generator and the non-fault generator;
the first current phase modulation module is used for modulating the phase of the amplified current of the non-fault motor;
the second current phase modulation module is used for modulating the phase of the current of the non-fault motor after the voltage division by the voltage division module;
a generator phase modulation module for configuring the amplified voltage adjusted by the voltage phase modulation module to a rectifier of a fault generator;
and the bus adjusting module is used for being matched with the generator phase adjusting module to output the adjusted voltage output by the rectifier of the fault motor to the direct current collector of the motor set.
As a preferred mode of the present invention, the amplitude limiting module and the amplitude increasing module correspond to permanent magnet poles of each generator, the amplitude limiting module limits the magnetic field size of the permanent magnet poles, the amplitude increasing module increases the magnetic field of a non-fault generator magnetic pole of which the amplitude limiting module removes the magnetic field amplitude limitation, the magnetic field of the non-fault generator increases, and the power generation power of the non-fault generator increases;
after the amplification module increases the magnetic field, the amplitude limiting module locks the magnetic field of the amplified non-fault generator;
when the fault motor returns to be stable, the amplitude limiting module carries out amplitude limiting on the magnetic field of the non-fault generator, and the magnetic field after amplitude is reduced to the size of the initial magnetic field.
As a preferred mode of the present invention, the amplification module additionally adds an electromagnetic pole to the permanent magnet pole, the amplification module is configured as an electromagnetic induction loop, and when the non-fault motor needs to be amplified, the amplification module increases a current in the electromagnetic induction loop.
As a preferred mode of the present invention, when the amplification module amplifies a non-fault generator, the current phase modulation module records as a current phase angle phase modulation a degree that a phase angle of a current of the generator amplified by the amplification module and a phase angle of a voltage have a certain phase difference;
when the voltage division module divides the voltage of the amplified non-fault generator, the current phase modulation module adjusts the phase angle of the current of the non-fault generator divided by the voltage division module into an initial state, and the phase angle is recorded as current phase angle compensation, and the initial state is the state of the initial phase angle of the current before the current amplification.
As a preferable aspect of the present invention, when the current phase modulation module performs phase modulation, the phase angle of the current is adjusted to a position corresponding to a predetermined power of the non-faulty generator based on a voltage amplification obtained by amplifying the power of the non-faulty generator by the amplification module.
As a preferred mode of the present invention, the amplification of the non-fault generator by the amplification module is a continuous process, and the phase modulation of the amplified current of the non-fault generator by the current phase modulation module is a phase modulation process corresponding to the amplification process of the amplification module.
As a preferred mode of the present invention, the generator phasing module, after acquiring the voltage divided by the voltage dividing module of the non-faulty motor of the motor group, performs phasing on each of the amplified voltages from the generators, and adjusts the phase angle of each of the amplified voltages to an angle after one cycle of the initial phase angle of the corresponding generator generated voltage.
As a preferred mode of the present invention, when the phase modulation module of the generator modulates the phase of the amplified voltage, the phase modulation module performs corresponding phase modulation on the current generated by the amplified voltage;
after the amplified voltage of each non-fault generator and the current phase modulation generated by the amplified voltage are completed, the generator phase modulation module configures the amplified voltage in a rectifier of the fault generator.
As a preferred mode of the present invention, the bus adjusting module outputs power of the amplified power of the fault motor to the amplifying module, and the bus adjusting module starts the dc bus after the generator phase adjusting module configures the amplified voltage to the fault generator.
As a preferable mode of the present invention, for the power observation module, when it is determined that the output power of the faulty generator gradually exceeds the power value when no fault occurs, it is determined that the fault of the generator set is eliminated at that time, and the amplitude limiting module limits the power output of the generator.
The invention realizes the following beneficial effects:
1. according to the invention, the power amplification is directly carried out by using the non-fault generator in the generator set, the voltage and power compensation is carried out on the fault generator through the amplified voltage brought by the amplified power, so that the fault generator can be self-adjusted when a fault occurs, and the power loss value can be evenly distributed to the non-fault generator in the generator set according to the power loss value of the fault generator in the self-adjusting process, thereby adjusting the amplification state of the non-fault generator.
2. According to the invention, through internal adjustment of a motor set in a power grid system, namely, through accessing the amplified power of a non-fault generator to a fault motor, the frequencies of compensation power and compensation voltage obtained by the fault generator are consistent with those before the fault, so that the compensation result is stable.
3. When the non-fault generator is amplified, the phase of the current is changed to enable the power transmitted in the lead after the non-fault generator is amplified to be consistent with the power before the non-fault generator is amplified, so that the power transmitted in a power generation system cannot break through rated power after the non-fault generator is amplified, the power grid is prevented from being broken down, the voltage after the non-fault generator is amplified is guaranteed to be greater than the voltage before the non-fault generator is amplified, and the voltage compensation of the fault generator can be continued.
4. The phase of the voltage and the current entering the fault generator is adjusted, so that the phase between the compensation voltage and the compensation current in the fault generator is kept absolutely consistent, the fault generator is ensured to generate power by the voltage and the current with the same phase as the non-fault motor, and the stability of a power generation system during compensation is ensured.
5. Through the internal compensation of the power generation system and the arrangement of idle generators in the generator set, namely generators which do not participate in power generation work in a normal state, when one generator in the generator set fails, the rest of non-failure generators can transmit the amplified voltage to the idle generator, so that the idle generator replaces the failure generator to generate power, the failure generator can be withdrawn from the power generation system, the maintenance of the failure generator is facilitated, and the power generation does not need to be stopped; when the generator needs to be overhauled, the method can be used for overhauling, so that the condition that the generator can be overhauled only by pausing power generation is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a diagram of the working steps of a new energy power generation control system provided by the invention;
FIG. 2 is a system framework diagram of a new energy power generation control system provided by the invention;
fig. 3 is a schematic phase difference diagram of a voltage waveform diagram and a current waveform diagram of a non-fault motor of the new energy power generation control system after passing through a current phase modulation module to phase-modulate a current according to the present invention;
FIG. 4 is a schematic view of current waveforms before and after phase modulation of a generator phase modulation module of the new energy power generation control system provided by the present invention;
fig. 5 is a schematic diagram of voltage waveforms before and after phase modulation of a generator phase modulation module of the new energy power generation control system provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Refer to fig. 1-5. The embodiment provides a new forms of energy power generation control system for control new forms of energy electric wire netting is stabilized and is generated and go back steady when the trouble, include:
the amplitude limiting module 1 is used for limiting the power of a generator in a generator set and limiting the released power;
the amplitude limiting module 1 is used for limiting the power of the generator and then increasing the power of the generator;
the power observation module 3 is used for observing the output power of a generator in the generator set and uploading the output power to a fault motor;
the voltage division module 4 is used for dividing the voltage corresponding to the power of the amplified part after the amplification module 2 amplifies the generator without the fault;
the voltage phase modulation module 5 is used for carrying out phase modulation of amplified voltage according to the voltage phase difference between the fault generator and the non-fault generator;
the first current phase modulation module 61 is used for modulating the phase of the amplified current of the non-fault motor;
the second current phase modulation module 62 is used for phase modulating the current of the non-fault motor after voltage division by the voltage division module 4;
a generator phasing module 7 configured to arrange the amplified voltage adjusted by the voltage phasing module 5 to a rectifier of a faulty generator;
and the bus adjusting module 8 is used for being matched with the generator phase adjusting module 7 to output the adjusted voltage output by the rectifier of the fault motor to a direct current collector of the motor set.
As a preferred mode of the present invention, the amplitude limiting module 1 and the amplification module 2 correspond to permanent magnet poles of each generator, the amplitude limiting module 1 limits the magnetic field size of the permanent magnet poles, and the amplification module 2 increases the magnetic field of a non-fault generator magnetic pole of which the amplitude limiting module 1 removes the magnetic field amplitude limitation, so that the magnetic field of the non-fault generator is increased, and the power generation power of the non-fault generator is increased;
after the amplification module 2 increases the magnetic field, the amplitude limiting module 1 locks the magnetic field of the amplified non-fault generator;
when the fault motor returns to be stable, the amplitude limiting module 1 carries out amplitude limiting on the magnetic field of the non-fault generator, and the magnetic field after amplitude increasing is reduced to the size of the initial magnetic field.
As a preferred mode of the present invention, the amplification module 2 additionally adds an electromagnetic pole to the permanent magnet pole, the amplification module 2 is configured as an electromagnetic induction loop, and when the non-fault motor needs to be amplified, the amplification module 2 increases the current in the electromagnetic induction loop.
As a preferred aspect of the present invention, when the amplification module 2 amplifies a non-fault generator, the current phasing module 6 refers to a current phase angle phasing in which a phase angle of a current of the generator amplified by the amplification module 2 is adjusted to have a certain phase difference with a phase angle of a voltage.
After the voltage division module 4 divides the voltage of the amplified non-fault generator, the current phase modulation module 6 adjusts the phase angle of the current of the non-fault generator divided by the voltage division module 4 to an initial state, and records the phase angle as current phase angle compensation, wherein the initial state is the state of the initial phase angle of the current before the current amplification.
As a preferred aspect of the present invention, when the phase modulation module 6 performs phase modulation, the phase angle of the current is adjusted to a position corresponding to a predetermined power of the non-faulty generator based on the voltage amplification obtained by amplifying the power of the non-faulty generator by the amplification module 2.
As a preferred mode of the present invention, the amplification of the non-fault generator by the amplification module 2 is a continuous process, and the phase modulation of the amplified current of the non-fault generator by the current phase modulation module 6 is a phase modulation process corresponding to the amplification process of the amplification module 2.
As a preferred mode of the present invention, the generator phasing module 7, after acquiring the voltage divided by the voltage dividing module 4 of the non-faulty motor of the motor group, performs phasing on each amplified voltage from each generator, and adjusts the phase angle of each amplified voltage to an angle after one cycle of the initial phase angle of the corresponding generator generated voltage.
As a preferred mode of the present invention, the generator phasing module 7 performs corresponding phasing on the current generated by the amplified voltage when performing phasing on the amplified voltage.
After the amplified voltage of each non-fault generator and the current phase modulation generated by the amplified voltage are completed, the generator phase modulation module 7 configures the amplified voltage in the rectifier of the fault generator.
As a preferred mode of the present invention, the bus adjusting module 8 outputs power of the amplified power of the fault motor to the amplifying module 2, and after the generator phase adjusting module 7 configures the amplified voltage to the fault generator, the bus adjusting module 8 starts the dc bus.
As a preferable mode of the present invention, when the power observation module 3 determines that the output power of the faulty generator gradually exceeds the power value when no fault occurs, it determines that the fault of the generator set is eliminated at this time, and the limiter module 1 limits the power output of the generator.
In the specific implementation process, when power generation is carried out, the power grid system generates power through the generator set, when the generator set generates certain oscillation, one or more corresponding generators in the generator set can generate certain oscillation, and the generators generating the oscillation can generate decline of electric power, so that power generation loss is caused. When a problem occurs in the generators in the generator set, for example, the generator A, the generator B and the generator C are shared in the generator set, when the generator A is supposed to generate oscillation, the generation voltage of the generator A is declined; at this time, the power observation module 3 observes that the generated power of the generator a decreases, and when the generated power decreases, the power observation module 3 transmits information of the generator a to the control system with the generator a as a faulty motor, and after confirming that the generator a is a faulty motor, the power observation module 3 transmits a waveform diagram of the generated voltage and a waveform diagram of the current corresponding to the generator a to the control system.
After the control system obtains the information of the generator A, according to the power of the generator A observed by the power observation module 3, the corresponding waveform diagram of the generated voltage and the waveform diagram of the current, the control system calculates the difference between the actual generated power of the generator A and the rated generated power according to the actual generated power of the generator A, and the power difference is the value of the power which needs to be compensated to the generator A by the generator B and the generator C, so that the amount of the power difference is evenly distributed to the generator B and the generator C.
For the generator B and the generator C, under the condition that the coil and the rotation speed are not changed, the period and the frequency are not changed, but only the amplitude, namely the maximum value of the power generation is changed, when the maximum value of the power generation is changed, the power generation power corresponding to the generator is simultaneously changed, therefore, the amplitude limiting module 1B corresponding to the generator B and the amplitude limiting module 1C corresponding to the generator C remove the power limitation of the generator B and the generator C, and further, the amplification module 2B corresponding to the generator B and the amplification module 2C corresponding to the generator C increase the power of the generator B and the generator C.
Taking the generator B as an example, the coil and the rotor corresponding to the generator B do not change, so the frequency of the power generation oscillogram corresponding to the generator B does not change, and further the amplification module 2B corresponding to the generator B increases the excitation current in the electromagnetic induction loop in the generator B, and when the excitation current increases, the electromagnetic field generated by the electromagnetic induction loop increases, and the direction of the electromagnetic field generated by the electromagnetic induction loop coincides with the direction of the permanent magnet poles, so the effective total magnetic field in the generator B is increased by the electromagnetic field increase matching with the permanent magnet poles in the generator B, and according to the formula E ═ NBS ω sin ω t, when the total magnetic field B increases, the maximum value of the electromotive force E increases, so the power generation voltage value of the generator B increases.
When the generated voltage of the generator B is increased, the current caused by the generated voltage is increased, so that the power corresponding to the generator B is increased, and the power on the wire corresponding to the generator B is increased to exceed the maximum load of the wire, and therefore, the power on the wire needs to be reduced.
Therefore, while the voltage generated by the generator B is increased, the first current phasing module 61 adjusts the current generated by the voltage generated by the generator B backward by a certain phase angle so that a corresponding phase difference relationship is generated between the voltage and the current, which is denoted as Φ, and therefore, the power of the generator B is Po ═ UIcos Φ, U is the generated voltage of the generator B amplified by the amplification module 2, I is the corresponding current, and Φ is the phase angle between the voltage and the current.
After the phase angle phi is adjusted, the power Po of the generator B is consistent with the respective generated power of all the generators when the generator A is not in fault, so that the safety of a line can be ensured when the power of the generator B is transmitted to the voltage division module 4. For phi, the control system calculates the ratio between the original power P and UI when no phase difference is provided, i.e. the cosine of the phase difference, i.e. the cos phi, and then calculates phi, i.e. the phase angle that should exist between the voltage U and the current I at that time, from the cos phi.
When power is transmitted to the voltage division module 4, the voltage division module 4 reacts to the voltage at this time, the voltage division module 4 limits backward transmission of the original voltage, and the voltage generated by the generator B at this time is obviously higher than the original voltage value, so that the voltage division module 4 distributes the current voltage value generated by the generator B, the value of the current voltage and the original voltage are continuously transmitted backward, and the surplus part, namely the part of the amplified voltage amplified by the amplification module 2B for the generator B, can be used as a compensation voltage to perform voltage compensation on the fault generator a.
At this time, the voltage phase modulation module 5 performs primary phase modulation on the amplified voltage, and adjusts the amplified voltage backward to a phase position which is an integral multiple of the initial phase angle period, that is, if the initial phase is α, the position of 2n pi- α is adjusted backward, and is generally adjusted to the position of 2 pi- α, so that the phase of the amplified voltage is consistent with the initial phase angle of the generator B under normal conditions, and the phase difference is 0.
When the voltage dividing module 4 divides the current generating voltage of the generator B, the voltage corresponding to the original voltage value is continuously transmitted backward, at this time, due to the voltage dividing function, the two divided voltages correspond to respective currents, and the currents are also naturally divided when the voltage dividing module 4 divides the current voltage, so that the currents and the voltages corresponding to the two voltages are still in a phase difference state. At this time, the second current phase modulation module 62 adjusts the current again according to the adjusted phi, provides a phase difference of 2 pi-phi for the current transmitted backward by the generator B, and compensates the phase difference to 2 pi, so that the phase difference can be ignored, and the process of current phase angle compensation is achieved. After the compensation is completed, the power actually transmitted to the frequency converter at this time is consistent with the initial power P.
The above example is the process of generator B, and the process of generator C is identical to the process of generator B.
For the voltage and the corresponding current divided by the voltage dividing module 4, the generator phase modulation module 7 adjusts, the generator phase modulation module 7 obtains the voltage and the corresponding current divided by the generator B and the generator C at the voltage dividing module 4, for the voltage, the phase modulation of the voltage is performed by the voltage phase modulation module 5, at this time, the phase of the voltage is consistent with the phase of the initial voltage, but in order to avoid an error in configuring the voltage, the generator phase modulation module 7 performs phase modulation on the part of the amplified voltage again, and the phase of one period is continuously adjusted backwards; correspondingly, for the corresponding current, the phase of the current corresponding to the amplified voltage can be simply and directly adjusted to be consistent with the phase of the amplified voltage at the moment, and the current can also be adjusted again according to the adjusted phi, the current corresponding to the amplified voltage provides a phase difference of 2 pi-phi, and the phase difference is compensated to 2 pi, so that the current and the voltage are in the same phase.
Furthermore, the generator phasing module 7 configures the amplified voltages provided by the generator B and the generator C on the generator a with a fault, and further, regardless of whether the generator a has any phase problem, the voltage phasing module 5 of the generator a adjusts the phase of the voltage of the generator a backwards to a corresponding position of one period, so that the phase of the voltage of the generator a is consistent with the phase of the compensation voltage provided by the generator phasing module 7, and the compensation voltage provided by the generator phasing module 7 can be perfectly adapted to the voltage of the generator a.
After perfect adaptation, generate electricity continuously, and the staff overhauls, in the maintenance process, generator A can appear power fluctuation, according to power fluctuation, control system carries out corresponding adjustment according to foretell method, the process of overhauing makes generator A resume gradually, because the factor of instantaneous value, in prosthetic in-process, when power fluctuation appears, holistic power value has the condition of the instantaneous power value that surpasses when not breaking down originally, control system can carry out the item adjustment this moment, take place the instantaneous value and surpass gradually many times, and do not have the instantaneous value and be less than the power originally after, judge that generator A returns steadily gradually this moment, power generation system returns steadily gradually.
When the system gradually stabilizes, the amplitude limiting module 1 gradually limits the generator B and the generator C, so that the power of the generator B and the power of the generator C are reduced, correspondingly, the power on the corresponding lead is reduced, and the power is adjusted to meet the rated power by the voltage phase adjusting module 5 and the current phase adjusting module 6, so that the power at the lead is reduced when the power of the generator B and the power of the generator C is reduced, and therefore, for the current at this moment, the phase of the current is adjusted forwards by the first current phase adjusting module 61, so that the power obtained by calculating the voltage and the current at this moment is in a state of being consistent with the initial power P.
Particularly, idle generators, namely generators which do not participate in power generation in a normal state, can be arranged in the generator set, when one generator in the generator set fails, the other non-failure generators can transmit the amplified voltage to the idle generator, so that the idle generator replaces the failure generator to generate power, the failure generator can be withdrawn from the power generation system, the maintenance of the failure generator is facilitated, and the power generation does not need to be stopped; when the generator needs to be overhauled, the method can be used for overhauling, so that the condition that the generator can be overhauled only by pausing power generation is avoided.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A new energy power generation control system is used for controlling a new energy power grid to stably generate power and return to stability when a fault occurs, and is characterized by comprising:
the amplitude limiting module is used for limiting the power of a generator in the generator set and releasing the power limitation;
the amplitude limiting module is used for increasing the power after the power limit of the generator is removed;
the power observation module is used for observing the output power of a generator in the generator set and uploading the output power to a fault motor;
the voltage division module is used for dividing the voltage corresponding to the power of the amplified part after the amplification module amplifies the generator without the fault;
the voltage phase modulation module is used for carrying out phase modulation of the amplified voltage according to the voltage phase difference between the fault generator and the non-fault generator;
the first current phase modulation module is used for modulating the phase of the amplified current of the non-fault motor;
the second current phase modulation module is used for modulating the phase of the current of the non-fault motor after the voltage division by the voltage division module;
a generator phase modulation module for configuring the amplified voltage adjusted by the voltage phase modulation module to a rectifier of a fault generator;
and the bus adjusting module is used for being matched with the generator phase adjusting module to output the adjusted voltage output by the rectifier of the fault motor to the direct current collector of the motor set.
2. The new energy power generation control system according to claim 1, characterized in that: the amplitude limiting module and the amplification module correspond to permanent magnet poles of all the generators, the amplitude limiting module limits the magnetic field size of the permanent magnet poles, the amplification module increases the magnetic field of a magnetic pole of a non-fault generator with the amplitude limiting module removing the magnetic field amplitude limiting, the magnetic field of the non-fault generator is increased, and the power generation power of the non-fault generator is increased;
after the amplification module increases the magnetic field, the amplitude limiting module locks the magnetic field of the amplified non-fault generator;
when the fault motor returns to be stable, the amplitude limiting module carries out amplitude limiting on the magnetic field of the non-fault generator, and the magnetic field after amplitude is reduced to the size of the initial magnetic field.
3. The new energy power generation control system according to claim 2, characterized in that: the amplification module is additionally provided with an electromagnetic pole for the permanent magnet pole, the amplification module is arranged into an electromagnetic induction loop, and when the non-fault motor needs to be amplified, the amplification module increases the current in the electromagnetic induction loop.
4. The new energy power generation control system according to claim 1, characterized in that: when the amplification module amplifies a non-fault generator, the first current phase modulation module adjusts the phase angle of the current of the generator amplified by the amplification module to have a certain phase difference with the phase angle of the voltage, and the phase angle is recorded as current phase angle phase modulation;
when the voltage division module divides the voltage of the amplified non-fault generator, the second current phase modulation module adjusts the phase angle of the current of the non-fault generator divided by the voltage division module into an initial state, and the phase angle is recorded as current phase angle compensation, and the initial state is the state of the initial phase angle of the current before the current amplification.
5. The new energy power generation control system according to claim 4, characterized in that: when the first current phase modulation module carries out phase modulation, the phase angle of the current is adjusted to a position which accords with the set power of the non-fault generator according to the voltage amplification obtained after the amplification module amplifies the power of the non-fault generator.
6. The new energy power generation control system according to claim 5, characterized in that: the amplification module continuously amplifies the non-fault generator, and the first current phase modulation module phase-modulates the amplified current of the non-fault generator into a phase modulation process corresponding to the amplification process of the amplification module.
7. The new energy power generation control system according to claim 1, characterized in that: the voltage phase modulation module is used for phase modulating the amplified voltage from each generator after acquiring the voltage divided by the voltage division module of the non-fault motor of the motor group, and adjusting the phase angle of each amplified voltage to an angle after one period of the initial phase angle of the corresponding generator generating voltage.
8. The new energy generation control system according to claim 7, characterized in that: the voltage phase modulation module performs corresponding phase modulation on the current generated by the amplified voltage when modulating the phase of the amplified voltage;
after the amplified voltage of each non-fault generator and the current phase modulation generated by the amplified voltage are completed, the generator phase modulation module configures the amplified voltage in a rectifier of the fault generator.
9. The new energy generation control system according to claim 8, characterized in that: the bus adjusting module outputs power of the amplified power of the fault motor aiming at the amplifying module, and the bus adjusting module starts a direct current bus after the phase modulating module of the generator configures the amplified voltage to the fault generator.
10. The new energy power generation control system according to claim 1, characterized in that: and for the power observation module, when the output power of the fault generator is judged to gradually exceed the power value when no fault occurs, the fault of the generator set is judged to be eliminated at the moment, and the amplitude limiting module limits the power output of the fault generator.
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