CN111628507A - Novel phase modulator and SVG coordinated control method for suppressing transient overvoltage - Google Patents
Novel phase modulator and SVG coordinated control method for suppressing transient overvoltage Download PDFInfo
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- CN111628507A CN111628507A CN202010237665.XA CN202010237665A CN111628507A CN 111628507 A CN111628507 A CN 111628507A CN 202010237665 A CN202010237665 A CN 202010237665A CN 111628507 A CN111628507 A CN 111628507A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a novel phase modulator and SVG coordinated control method for suppressing transient overvoltage. Aiming at the condition of transient overvoltage of a sending end caused by direct current commutation failure and locking fault, the following method is provided: during steady-state operation, dynamic reactive power reserves of the novel phase modulator and the SVG are optimized, the working modes of the phase modulator and the SVG are switched according to different conditions of phase change failure and locking temporarily when faults occur, switching control of a filter is assisted, the SVG control link introducing voltage-current slope control is particularly used, transient overvoltage suppression capability is perfected on the basis of voltage regulation of the novel phase modulator by controlling two operation parameters of the SVG, and an ideal coordination control effect is achieved. The method effectively inhibits transient overvoltage of the direct-current transmission transmitting end under the working condition of direct-current transmission commutation failure/locking, achieves good voltage coordination control capability, and reduces the grid disconnection phenomenon of the wind turbine of the direct-current transmitting end due to the transient overvoltage.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a novel phase modulator and SVG (static var generator) coordinated control method for suppressing transient overvoltage
Background
The ultrahigh voltage direct current transmission end in China is mostly a weak transmission end system developed in a large-scale new energy such as wind power and the like in a centralized manner, the direct current transmission end transient state voltage rise problem caused by two major faults of direct current transmission commutation failure and direct current blocking is more obvious, and the new energy is caused to be disconnected in a large area under severe conditions.
The novel phase modulator is used as rotary equipment, can provide short-circuit capacity for a system, is not influenced by the system in regulating capacity, and has unique advantages in aspects of providing high-capacity dynamic reactive support and the like. The new generation of novel phase modulators is optimized in transient response and overload capacity, and has the fastest instantaneous reactive support speed at present. However, the current model of the novel phase modulator is single, the supporting equipment is various, the occupied area is huge, the phase advance capability is poor relative to the phase delay capability, the response speed of the self excitation control system is slow, the voltage fluctuation adjusting effect is not ideal in the face of continuous phase commutation failure, and the problem of new energy off-line under the working condition of the fault cannot be completely solved only by the novel phase modulator. And the current research mostly installs novel phase modifier in direct current receiving end, lacks research and practical application to direct current sending end.
The SVG is used as the power electronic reactive power compensation equipment with the highest response speed at present, and overcomes the defects of low response speed, large volume, large harmonic wave and loss and the like of the traditional passive compensation device. However, the reactive power regulation capability is still affected by the system, and the high-voltage resistance of the power electronic element is poor. But has the advantages of flexible configuration capacity and small occupied area compared with the novel phase modulator. And can quickly reach full power reactive power absorption after transient voltage rises, and particularly has better overvoltage suppression effect after direct current locking.
Because the power electronic equipment of the rectifier station is various, SVG has potential disturbance risk, and the novel phase modulator is only 300Mvar at present, is suitable for high voltage grade, and the volume of the novel phase modulator is not suitable for a wind power plant. Therefore, the novel phase modulator can only be arranged on the side of the rectifier station, and the SVG is put into each wind power plant for local compensation. However, how to coordinate the whole reactive power regulation mode of the novel phase modulator and the SVG to the direct current terminal so as to achieve a good transient overvoltage suppression effect is a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a novel phase modulator and SVG (static var generator) coordination control method for inhibiting transient overvoltage of a direct current sending end, which mainly comprises the steps of providing a novel phase modulator and SVG coordination control method for inhibiting transient voltage rise effect of the direct current sending end, and optimizing and adjusting specific parameters of the method. The result shows that the coordination control method improves the reactive support effect of the novel phase modulator and the SVG, reduces the transient overvoltage of a bus of a wind power plant in the near area of a direct-current transmission end, reduces the low-voltage network disconnection and high-voltage network disconnection probability of a fan, and improves the safety and stability level of the extra-high voltage direct-current transmission. In order to achieve the purpose, the technical method adopted by the invention is as follows:
step 1: on the side of the rectifier station, under the steady state operation condition, the novel phase modulator adopts a constant reactive power operation mode. The novel phase modulator is made to bear the reactive power required by normal operation of a part of the rectification station. In order to ensure that the voltage fluctuation of the switching bus of the filter is not more than 1%, the novel phase modulator needs to reserve certain static reactive power.
Step 2: wind farm side: under the steady-state operation condition, the SVG adopts a constant reactive power operation mode. Monitoring wind farm bus voltage Us in real time, comparing the system requirement wind farm bus voltage UNWhen Us<0.95UNOr Us>1.01UNMeanwhile, the SVG at the wind power plant side is switched to 1.0UNConstant voltage control for constant values, otherwise voltage fluctuations deemed acceptable are still subject to constant reactive power control. The SVG constant voltage control mode adopts a voltage regulation mode introducing slope characteristics. Setting SVG voltage-current control slope parameter regulator to regulate slope parameter KD。
And step 3: when the direct current transmission has phase change failure, the novel phase modulator on the rectifier station side is switched to a constant voltage control mode, and the novel phase modulator utilizes the quick transient response capability to adjust the bus voltage of the rectifier station. And if continuous commutation fails, the filter on the side of the rectifier station starts to cut off when the commutation fails for the second time, otherwise, the filter of the rectifier station does not act.
And 4, step 4: when the phase change failure occurs in the direct current power transmission, the SVG at the wind power plant side enters a constant voltage control mode, simultaneously adjusts the voltage-current control slope parameter of the SVG, and increases the voltage-current control slope parameter K of the SVGD. When the voltage is lower than the reference value, properly increasing the power grid voltage reference value parameter U of the SVG control systemref(ii) a When the voltage is higher than the reference value, the power grid voltage of the SVG control system is properly reducedReference value parameter Uref。
And 5: when direct current blocking occurs or phase commutation failure finally causes direct current blocking, the voltage of a direct current sending end near region presents a characteristic of sharp rise. The novel phase modulator on the rectifier station side maintains a constant voltage control mode, absorbs redundant reactive power, and meanwhile, the rectifier station cuts off a filter instruction.
Step 6: when direct current blocking occurs or phase commutation failure finally causes direct current blocking, the wind farm bus voltage also presents a characteristic of 'sharp rise'. And the SVG is maintained in a constant reactive power mode, and the SVG is controlled to work in a full-perception saturated working state to absorb redundant reactive power.
The control effect is as follows: the novel phase modulator and SVG coordinated control method for suppressing transient overvoltage provided by the invention has the following remarkable advantages:
(1) aiming at the whole direct current transmission end, a novel phase modulator is installed at a rectification station, and SVG is installed at the side of a wind power plant bus, so that a space coordination optimal solution scheme of the whole direct current transmission end reactive power compensation device is realized. And parameters of the novel phase modulator and the SVG during steady-state operation are adjusted, and the standby dynamic reactive capacity is effectively improved, so that the optimal effect of coping with transient voltage rise of a direct current transmission end is achieved.
(2) To novel phase modifier incoming phase ability weak relatively, utilize SVG to carry out voltage regulation control to wind-powered electricity generation field terminal generating line, the novel phase modifier of cooperation has further alleviated wind-powered electricity generation field terminal generating line transient state voltage sudden change amplitude under the direct current transmission commutation failure/direct current shutting condition, has complemented the unfavorable effect that novel phase modifier excitation control delay brought through SVG. And the detail adjustment of control parameters is carried out according to the actual operation condition of the wind power plant, so that the off-grid rate of the direct current sending end fan under the working condition of commutation failure can be effectively reduced.
(3) When accomplishing novel phase modulation machine to the rectification station respectively, SVG compensates in the spot to wind-powered electricity generation field, reply direct current send end transient state pressure rise, adjust novel phase modulation machine and SVG reply direct current commutation failure and the mode of operation under the two kinds of common fault working conditions of direct current shutting, reach good harmonious step-down effect to the coordinated control of novel phase modulation machine and rectification station wave filter, SVG and other reactive sources in the wind-powered electricity generation field has been considered.
Drawings
The technical solution of the present invention is further described in detail by the accompanying drawings.
FIG. 1 is a diagram of SVG control model with slope control introduced
FIG. 2 is a SVG voltage-current characteristic curve diagram
FIG. 3 is a diagram showing the variation of the wind turbine bus voltage under the condition of continuous commutation failure of simulation results
FIG. 4 is a diagram showing the variation of the voltage of the wind turbine bus under the DC blocking condition of the simulation result
FIG. 5 is a reactive force diagram of SVG and novel phase modulator under the condition of direct current blocking of simulation result
Detailed Description
For better understanding of the present invention, the following detailed description of the present invention is made with reference to the accompanying drawings, and simulation examples are provided to verify the effect of the present invention.
The method specifically comprises the following steps:
step 1: on the side of the rectifier station, under the steady state operation condition, the novel phase modulator adopts a constant reactive power operation mode. The novel phase modulator is made to bear the reactive power required by normal operation of a part of the rectification station. In order to ensure that the voltage fluctuation of the switching bus of the filter is not more than 1%, the novel phase modulator needs to reserve certain static reactive power.
ΔQ＝Qf-(Un×1％)/k
In the formula: qfA single filter capacity; k is the ratio of voltage to reactive power of the injection system, namely the reactive voltage sensitivity coefficient; u shapenIs the converter station ac bus voltage rating. Therefore, the maximum value and the minimum value of the reactive power of the novel phase modulator are respectively Qmax＝Sn-ΔQ
Qmin＝Sj-ΔQ
In the formula SnThe phase-delay reactive power is the maximum delay reactive power of the novel phase modulator; sjThe phase-advance reactive power is the maximum phase-advance reactive power of the novel phase modulator.
The input quantity of a filter of the rectification station is adjusted according to the reactive compensation quantity of the novel phase modulator:
Qf＝QR-Sn
in the formula: qfThe filter needs to generate reactive power; qRAbsorbing reactive power for the converter valve. The filter input is the setting output of the novel phase modulator subtracted from the converter valve absorption reactive power. The converter station and the novel phase modulator as a whole exchange reactive power to the system is close to 0. Therefore, the input amount of the direct current filter is reduced, the reactive power of direct current commutation failure/latch excess is reduced, the instantaneous reactive power absorption of the novel phase modulator is guaranteed, and the transient overvoltage value is further restrained under the condition of direct current commutation failure/latch. The problem that the dynamic fallback reserve of the novel phase modulator is insufficient due to the fact that the filter and the novel phase modulator are independently controlled is solved.
Step 2: wind farm side: under the steady-state operation condition, the SVG adopts a constant reactive power operation mode to reduce the probability of abnormal oscillation of the voltage of the wind power collection system. It should be noted that: when the SVG and the fan are adjusted by the wind power plant system in a steady state, the SVG is selected to be preferentially adjusted because of quick response of the SVG, and the fan is adjusted after the SVG has insufficient adjusting capability; however, considering the risks of direct current commutation failure and blocking, the SVG is required to provide reactive power to support the voltage of a grid-connected point, so that the SVG needs to leave a certain reactive power margin in the adjusting process, is set to be 50% of the total reactive power capacity, and is determined as an optimal dynamic reactive power reserve point of the SVG. SVG grid-connected point voltage U is monitored in real timesComparing the system requirements for wind farm bus voltage UNWhen U is formeds＜0.95UNOr Us＞1.01UNIn time, no matter whether the direct current side has commutation failure/blocking fault, the SVG on the wind power plant side is uniformly converted into the SVG with 1.0UNConstant voltage control mode, which is a constant value, otherwise the voltage fluctuations deemed acceptable are still subject to constant reactive power control. The SVG constant voltage control mode adopts a voltage regulation mode introducing slope characteristics. Setting SVG voltage-current control slope parameter regulator, if the failure of DC commutation/blocking fault is only voltage fluctuation, SVG voltage-current control slope parameter KD2 percent of the total weight is taken. The control model is shown in figure 1.
And step 3: when the phase change failure occurs in the direct current transmission, the voltage of the direct current transmission end in the near area presents the characteristic of 'firstly reducing and then increasing'. The novel phase modifier of rectifier station side switches into the constant voltage control mode, and novel phase modifier utilizes its quick transient response ability to adjust rectifier station busbar voltage, and the concrete expression does: when the voltage drops, the novel phase modulator rapidly sends out a large amount of bus voltage of the reactive support rectifier station according to the forced excitation characteristic; when the voltage rises, the novel phase modulator reduces the bus voltage of the rectifier station according to the large reactive power of the instantaneous absorption system. And if continuous commutation fails, the filter on the side of the rectifier station starts to cut off when the commutation fails for the second time, otherwise, the filter of the rectifier station does not act.
And 4, step 4: when the direct current transmission has phase commutation failure, the bus voltage of the wind power plant also has the characteristic of being firstly reduced and then increased. The SVG enters a constant voltage control mode, and simultaneously adjusts a SVG voltage-current control slope parameter adjuster to increase a SVG voltage-current control slope parameter KDThe content was 5%. When the voltage is lower than the reference value, properly increasing the power grid voltage reference value parameter U of the SVG control systemrefThe voltage-current characteristic of the SVG is improved, so that the SVG can rapidly provide maximum capacitive reactive current; when the voltage is higher than the reference value, the power grid voltage reference value parameter U of the SVG control system is properly reducedrefThe voltage-current characteristic of the SVG is reduced, so that the SVG can rapidly provide the maximum inductive reactive current. The SVG voltage-current characteristic curve is shown in the attached figure 2 of the specification. The patent introduces the SVG superiority description of slope control with the accompanying figure 2 of the specification:
(1) adjusting the same target, greatly reducing the required amount constant reactive capacity of the SVG
(2) Prevent SVG from reaching its output reactive maximum limit too frequently
(3) Under the condition that a plurality of SVGs operate in parallel, the method is favorable for reasonably distributing respective output reactive power
And 5: when direct current blocking occurs or phase commutation failure finally causes direct current blocking, the voltage of a direct current sending end near region presents a characteristic of sharp rise. The novel phase modulator on the rectifier station side maintains a constant voltage control mode, absorbs redundant reactive power, and meanwhile, the rectifier station cuts off a filter instruction.
Step 6: when direct current blocking occurs or phase commutation failure finally causes direct current blocking, the wind farm bus voltage also presents a characteristic of 'sharp rise'. And detecting whether a filtering branch in the wind power plant is put into use. If the filtering branch is in the input state, the filtering branch is firstly exited. And the SVG is maintained in a constant reactive power mode, and the SVG is controlled to work in a full-perception saturated working state to absorb redundant reactive power.
According to the above embodiments, the present invention provides the following simulation verification:
simulation verification 1:
the invention utilizes the fact that a novel phase modulator is additionally arranged on an alternating current side bus of a rectification station, and SVG is additionally arranged on a near-region part of a wind power plant for coordination control. The bus voltage comparison graph is shown in the attached figure 3 in the specification, wherein a novel phase modulator is not added in the comparison analysis, a novel phase modulator is added in the rectifying station, and SVG is added in the near-area wind power plant, and three times of phase change failures continuously occur on the direct-current transmission inversion side. The simulation system takes a wine lake direct current system and a qilian converter station near-region wind power plant to perform simulation experiments.
Taking qilian converter stations and gan' an wind power plant in the near region thereof as an example, 2 novel phase modulators are additionally arranged in qilian converter stations, and the capacity of each phase modulator is 300 MVA. SVG with the capacity of 60MVA is additionally arranged on one wind farm outlet bus gan' an 62S 3. Simulating Keemuo direct current to generate continuous 3 times of phase change failures, comparing and observing the voltage fluctuation condition of a bus GanAN 62S3 in the original condition, namely, only additionally arranging a novel phase modulator in a Keemuo converter station and a novel phase modulator in a rectifier station and simultaneously adding SVG in a wind power plant.
As shown in fig. 3 of the specification, it can be seen from simulation results that when a first commutation failure occurs in 0.2 seconds, and a new phase modulator is installed in a rectifier station, the lowest voltage of the first voltage fluctuation is raised by 0.0108p.u., and the highest voltage is lowered by 0.0024p.u., but because a certain delay and low excitation protection exist in an excitation control system of the new phase modulator, when a second commutation failure occurs in 0.6 seconds and a 3 rd commutation failure occurs in 1.0 seconds, the new phase modulator can still well raise the transient low voltage, but the bus voltage peak value is increased by 0.0026p.u.
After the SVG is additionally installed on a bus of a wind power plant, under the coordination control of the novel phase modulation machine and the SVG, the lowest voltage is increased by 0.0224p.u. when the phase commutation fails for the first time, the highest voltage is reduced by 0.0124p.u., and during the subsequent phase commutation failure, because the SVG can rapidly reach the full-capacity regulation, the voltage regulation effect is far better than the condition of only the novel phase modulation machine.
Simulation verification 2:
and taking a Qilian converter station and a local Gan' an wind power station bus as an example, carrying out QiShao direct current locking simulation. Setting the time of 2s to generate direct current blocking. The simulation result is shown in an attached figure 4 of the specification, the blocking instantaneous voltage peak of a Gansu 62S3 bus is reduced by 0.0052p.u. under the condition that a novel phase modulator is additionally arranged on a rectifier station, meanwhile, the peak value is further reduced by 0.0020p.u. after SVG is additionally arranged on a bus of a wind power plant, and the voltage of a subsequent steady state is reduced by 0.0164p.u., so that the control capability of the novel phase modulator combined with the SVG for coping with the large transient pressure rise is embodied.
The novel phase modulator and the SVG reactive power output after the locking are shown in the attached figure 5 of the specification, and it can be seen that because the novel phase modulator of 300MVA is under the low excitation control, the reactive power is further controlled at 165Mvar, and the reactive power absorbing capacity in the SVG overvoltage process exceeds 60Mvar, although the response speed is slightly slower than that of the novel phase modulator, the full power reactive power absorbing capacity can be rapidly achieved, and the novel phase modulator and the SVG reactive power absorbing capacity have a good inhibiting effect on the steady-state overvoltage after the direct current locking.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (4)
1. A novel phase modulator and SVG coordinated control method for suppressing transient overvoltage is characterized in that: the method comprises a novel coordination control method for improving and suppressing the transient voltage rise effect of a direct current transmission end by using a phase modulator and an SVG (static var generator), and a parameter regulation scheme of the coordination control method.
2. The novel phase modulator and SVG coordinated operation control method of claim 1 for improving and suppressing transient voltage rise effect of DC transmitting end, comprising the steps of:
(1) on the side of the rectifier station, under the steady state operation condition, the novel phase modulator adopts a constant reactive power operation mode. Meanwhile, the novel phase modulator needs to keep certain static reactive power reserve.
(2) Wind farm side: under the steady-state operation condition, the SVG adopts a constant reactive power operation mode. Monitoring wind farm bus voltage Us in real time, comparing the system requirement wind farm bus voltage UNWhen Us<0.95UNOr Us>1.01UNMeanwhile, the SVG at the wind power plant side is switched to 1.0UNConstant voltage control for constant values, otherwise voltage fluctuations deemed acceptable are still subject to constant reactive power control. The SVG constant voltage control mode adopts a voltage regulation mode introducing slope characteristics.
(3) When the direct current transmission has phase commutation failure, the novel phase modulator at the rectifier station side is switched to a constant voltage control mode. And if continuous commutation fails, the filter on the side of the rectifier station starts to cut off when the commutation fails for the second time, otherwise, the filter of the rectifier station does not act.
(4) When the phase change failure occurs in the direct current power transmission, the SVG at the wind power plant side enters a constant voltage control mode, and simultaneously adjusts the SVG voltage-current control slope parameter adjuster to increase the SVG voltage-current control slope parameter KD. And adjusting the power grid voltage reference value parameter U of the SVG control system according to the voltageref。
(5) When direct current blocking occurs, the novel phase modulator on the rectifier station side maintains a constant voltage control mode, and meanwhile, the rectifier station cuts off a filter instruction.
(6) When direct current blocking occurs, the SVG at the wind power plant side is maintained in a constant reactive power mode, and the SVG is controlled to work in a full-sensitivity saturated working state.
3. The parametric modulation scheme of claim 1: the method is characterized in that: the method comprises the following steps:
in the step (2), the SVG voltage-current control slope parameter regulator is set to regulate the slope parameter KDThe content was 2%.
4. The parametric modulation scheme of claim 1: the method is characterized in that: the method comprises the following steps: in the step (4), the SVG voltage-current control slope parameter K is increasedDThe content was 5%.
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| CN112865117A (en) * | 2021-01-13 | 2021-05-28 | 国电南瑞科技股份有限公司 | Reactive emergency control method, device and system after new energy collection direct current blocking |
| CN113489017A (en) * | 2021-05-26 | 2021-10-08 | 国电南瑞科技股份有限公司 | Emergency control method and system for phase modulator, storage medium and computing equipment |
| CN113497462A (en) * | 2021-01-29 | 2021-10-12 | 国网冀北电力有限公司电力科学研究院 | Reactive voltage control method and system for rapidly restraining transient voltage |
| CN113765159A (en) * | 2021-07-27 | 2021-12-07 | 中国电力科学研究院有限公司 | Method and system for improving voltage control capability of new energy station based on coordination control |
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| CN113497462A (en) * | 2021-01-29 | 2021-10-12 | 国网冀北电力有限公司电力科学研究院 | Reactive voltage control method and system for rapidly restraining transient voltage |
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| CN113765159A (en) * | 2021-07-27 | 2021-12-07 | 中国电力科学研究院有限公司 | Method and system for improving voltage control capability of new energy station based on coordination control |
| CN113765148B (en) * | 2021-07-27 | 2023-08-18 | 中国电力科学研究院有限公司 | Method and system for improving voltage control capability of wind power station based on coordination control |
| CN113765159B (en) * | 2021-07-27 | 2023-10-24 | 中国电力科学研究院有限公司 | Method and system for improving voltage control capability of new energy station based on coordination control |
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