CN105071353A - Multiple-protection device of secondary synchronous dynamic stabilizer and method - Google Patents
Multiple-protection device of secondary synchronous dynamic stabilizer and method Download PDFInfo
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Abstract
The present invention relates to the technical field of a grid and discloses a multiple-protection device of a secondary synchronous dynamic stabilizer and a method. The multiple-protection device comprises a speed measuring unit which is connected to a generator set and is used for measuring the speed of the generator set and obtaining two paths of rotation speed signals which are backups of each other, a protection unit which is connected to the speed measuring unit and the secondary synchronous dynamic stabilizer and is used for obtaining the rotation speed signals from the speed measuring unit and is used for detecting the current signal and voltage signal of the secondary synchronous dynamic stabilizer and the grid voltage and allows the secondary synchronous dynamic stabilizer to stop running when the two paths of rotation speed signals are abnormal or a condition that the current signal, the voltage signal and grid voltage is larger than or smaller than set thresholds is detected. In addition, the invention also discloses a secondary synchronous oscillation suppression device with the multiple-protection device. According to the device and the method, the generator set, a power system and the secondary synchronous dynamic stabilizer are not interfered by the fault of each other.
Description
Technical field
The present invention relates to electric power network technique field, particularly, relate to a kind of multiplex protective device and method of subsynchronous dynamic stability device.
Background technology
Along with the continuous expansion of network system, super high voltage direct current electricity transmission and heavy-duty generator group demand are also in improve, for reducing line transmission loss, conventional controlled series compensation improves voltage on line side at present, although the great economic benefit brought, but bring new trouble also to the safe and stable operation of generating set, subsynchronous oscillation of electrical power system is one of wherein comparatively serious problem.
From early 1970s; IEEE sub-synchronous oscillation working group has carried out large quantifier elimination to sub-synchronous oscillation problem, proposes the measure of various suppression generator sub-synchronous oscillation: the transformation etc. of filtering and damping, relaying protection and monitoring and protecting, system switching operation and unit excision and generating set and system.Subsynchronous dynamic stability device is the New Reactive Power Compensation Device of latest developments, provides idle by the break-make controlling turn-off device to system.Because STATCOM have employed IEGT self-turn-off device, SPWM control technology can be adopted, have fast, flexibly, control mode easily, to solution China sub-synchronous oscillation problem, there is great engineering practical value.
But it is little that the protection for subsynchronous dynamic stability device is but studied, the multiplex protection therefore studying subsynchronous dynamic stability device has great importance.
Summary of the invention
The object of this invention is to provide a kind of multiplex protective device and method of subsynchronous dynamic stability device; for realizing, the multiplex of subsynchronous dynamic stability device is protected, to protect generating set, between electric power system and subsynchronous dynamic stability device mutually not by the impact of fault interference each other.
To achieve these goals, the invention provides a kind of multiplex protective device of subsynchronous dynamic stability device, described subsynchronous dynamic stability device is arranged between generating set and electrical network, described multiplex protective device comprises: test the speed unit, it connects generating set, for testing the speed to generating set, and obtain two-way tach signal for subsequent use each other; And protected location; test the speed described in its connection unit and described subsynchronous dynamic stability device; for obtaining tach signal from the described unit that tests the speed; also for detecting the current signal of described subsynchronous dynamic stability device, voltage signal and line voltage; and when two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device out of service.
Preferably, described protected location comprises: rotary speed of generator group protection module, for when described two-way tach signal is all abnormal, sends trip signal to described subsynchronous dynamic stability device.
Preferably, described protected location comprises: quick-break overcurrent protection module, when the current instantaneous value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, sends locking order to described subsynchronous dynamic stability device; And 1 section of overcurrent protection module, exceed the threshold value of setting for the current effective value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, send locking order to described subsynchronous dynamic stability device.
Preferably, described protected location comprises: valve group electric voltage over press protection module, exceed the threshold value of setting for the voltage effective value in the valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, send trip signal to described subsynchronous dynamic stability device; And valve group under-voltage protection module, for the threshold value of the voltage effective value in the valve group subsynchronous dynamic stability device being detected lower than setting, and when reaching the time of setting, send trip signal to described subsynchronous dynamic stability device.
Preferably, described protected location comprises: capacitance voltage overvoltage protective module, when the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, sends trip signal to described subsynchronous dynamic stability device; And capacitance voltage under-voltage protective module, for the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected lower than setting threshold value time, send trip signal to described subsynchronous dynamic stability device.
Preferably, described protected location comprises: line voltage overvoltage protective module, for when line voltage instantaneous value exceedes the threshold value of setting, sends trip signal to described subsynchronous dynamic stability device; And line voltage under-voltage protective module, for when line voltage instantaneous value is lower than the threshold value set, send trip signal to described subsynchronous dynamic stability device.
Preferably, described protected location also comprises: synchronous phase sequence protection module, for when detecting that synchronizing signal is negative phase-sequence, sends trip signal to described subsynchronous dynamic stability device.
Technical scheme of the present invention additionally provides a kind of multiplex guard method of subsynchronous dynamic stability device, described subsynchronous dynamic stability device is arranged between generating set and electrical network, comprise the following steps: generating set is tested the speed, and obtain two-way tach signal for subsequent use each other; Detect the current signal of described subsynchronous dynamic stability device, voltage signal and line voltage; And when two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device out of service.
Technical scheme of the present invention additionally provides a kind of sub-synchronous oscillation restraining device, comprising: above-mentioned multiplex protective device; Subsynchronous dynamic stability device, it is arranged between generating set and electrical network, for sending the electric current for suppressing sub-synchronous oscillation to generating set and electrical network; And control unit, it is connected between described protected location and described subsynchronous dynamic stability device, calculates for the tach signal according to generating set the control impuls driving described subsynchronous dynamic stability device to send the electric current for suppressing sub-synchronous oscillation.
Preferably, described protected location is integrated in described control unit.
Pass through technique scheme; the invention has the beneficial effects as follows: the multiplex protective device and the method that the invention provides a kind of subsynchronous dynamic stability device, protection generating set, the impact not disturbed by fault each other.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the structural representation of multiplex protective device and sub-synchronous oscillation restraining device in embodiments of the present invention;
Fig. 2 is the structural representation of the valve group of SVG in embodiments of the present invention;
Fig. 3 is the structural representation of protected location in embodiments of the present invention.
Description of reference numerals
1, multiplex protective device;
10, test the speed unit; 20, protected location; 30, subsynchronous dynamic stability device; 40, control unit;
201, rotary speed of generator group protection module; 202, quick-break overcurrent protection module; 203,1 section of overcurrent protection module; 204, valve group electric voltage over press protection module; 205, valve group under-voltage protection module; 206, capacitance voltage overvoltage protective module; 207, capacitance voltage under-voltage protective module; 208, line voltage overvoltage protective module; 209, line voltage under-voltage protective module; 210, synchronous phase sequence protection module.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 1, in electric power system, generating set to electrical network transmission of electric energy, is the loss reducing transmission line by transformer and transmission line, and normal employing increases the conveying capacity that method that string mends improves transmission line at present.But this method increasing string benefit also may cause sub-synchronous oscillation problem, makes generating set run with the frequency of oscillation lower than synchronizing frequency, has a strong impact on the fail safe of electric power system, and therefore power plant employs a lot of device suppressing sub-synchronous oscillation.
Subsynchronous dynamic stability device is adopted to realize the suppression of sub-synchronous oscillation in present embodiment, as shown in Figure 1, give a kind of multiplex protective device 1 (shown in dotted line frame) of subsynchronous dynamic stability device, comprise: test the speed unit 10, it connects generating set, for testing the speed to generating set, and obtain two-way tach signal for subsequent use each other; And protected location 20; test the speed described in its connection unit 10 and described subsynchronous dynamic stability device 30; for obtaining tach signal from the described unit 10 that tests the speed; also for detecting the current signal of described subsynchronous dynamic stability device 30, voltage signal and line voltage; and when two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device 30 out of service.
Above-mentioned subsynchronous dynamic stability device can adopt SVG general in prior art, is made up of water-cooling system, distribution system, UPS, control system, valve group, reactor etc.Wherein, as shown in Figure 2, described valve group is preferably the chain structure of corresponding three-phase three-wire system electrical network, and be often in series several IEGT phase modules, preferably, often by six IEGT phase module cascade compositions.In Fig. 2, valve group adopts star-like connected mode to be connected with electrical network by reactor, by the various high order characteristic harmonics of reactor filtering subsynchronous dynamic stability device.In addition, each IEGT phase module is parallel with electric capacity, and this electric capacity is the valve group electric capacity hereafter related to, and plays bypass protection function.
In present embodiment, as shown in Figure 3, described protected location mainly comprises any one or the many persons in the protection module of the several aspect of following protection.
One, rotating speed protection
Described protected location comprises rotary speed of generator group protection module 201; for when described two-way tach signal is all abnormal, send trip signal, after subsynchronous dynamic stability device receives trip signal to described subsynchronous dynamic stability device; tripping circuit breaker, thus protection generating set.
Wherein, as shown in Figure 1, n1 is primary input signal, and n2 is tach signal for subsequent use, the tach signal of primary input is compared with rated speed signal, when the error of the two exceedes the threshold value of setting, namely think that n1 tach signal is abnormal, switching n2 is primary input signal, when the two is all abnormal, subsynchronous dynamic stability device receives trip command, produces tripping fault, causes damage to generating set in order to avoid speed measuring device is abnormal.
Two, overcurrent protection
For overcurrent protection, described protected location comprises: quick-break overcurrent protection module 202, when the current instantaneous value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, sends locking order to described subsynchronous dynamic stability device; And 1 section of overcurrent protection module 203, exceed the threshold value of setting for the current effective value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, send locking order to described subsynchronous dynamic stability device.
Known, the object of quick-break overcurrent protection module 202 is that on protective valve group loop, equipment, from the damage caused because of instantaneous overcurrent, meets the requirement of reliability, selectivity, flexibility and quick-action.When the electric current on the arbitrary arm of valve group exceedes set point, send locking order immediately, prevent that subsynchronous dynamic stability device transient current is excessive causes damage to valve group IEGT phase module.In addition, except arranging threshold value, setting is when current signal instantaneous value is greater than the rated current of 4 times usually, sends locking order.
And the object of 1 section of overcurrent protection module 203 is that on protective valve group loop, equipment, from the damage caused because of overcurrent in short-term, that is to say and realizes delay protection, meet the requirement of reliability, selectivity, flexibility and time delay.When the electric current on the arbitrary arm of valve group exceedes set point, and when exceeding setting-up time, protection system sends locking order immediately, prevents that subsynchronous dynamic stability device short time current is excessive causes damage to valve group IEGT phase module.If current effective value is greater than the threshold value of setting, but do not reach the time of setting, then subsynchronous dynamic stability device continues to run.
Three, valve group voltage protection
Described protected location also comprises: valve group electric voltage over press protection module 204, the threshold value of setting is exceeded for the voltage effective value in the valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, send trip signal to described subsynchronous dynamic stability device; And valve group under-voltage protection module 205, for the threshold value of the voltage effective value in the valve group subsynchronous dynamic stability device being detected lower than setting, and when reaching the time of setting, send trip signal to described subsynchronous dynamic stability device.
That is, when voltage effective value is greater than the overvoltage protection value of setting, and exceed the time of setting, send trip signal; When voltage effective value is greater than the overvoltage protection value of setting, but do not exceed the time of setting, subsynchronous dynamic stability device normally runs; If voltage effective value is less than the under-voltage value of setting, and reach the time of setting, then send block signal; If voltage effective value is less than the under-voltage value of setting, but reach the time of setting, then subsynchronous dynamic stability device normally runs.
Four, capacitance voltage protection
Each IEGT phase module is had to be parallel with electric capacity in valve group, this electric capacity plays bypass protection function, for this electric capacity, described protected location also comprises: capacitance voltage overvoltage protective module 206, when the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, send trip signal to described subsynchronous dynamic stability device; And capacitance voltage under-voltage protective module 207, for the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected lower than setting threshold value time, send trip signal to described subsynchronous dynamic stability device.
Namely; the voltage at the multiplex protective device Real-Time Monitoring valve group electric capacity two ends of present embodiment, if when capacitance voltage instantaneous value is greater than the overpressure value of setting, equipment sends trip signal; if when capacitance voltage instantaneous value is less than the under-voltage value of setting, equipment sends trip signal.
Five, line voltage protection
Line voltage also can cause the damage of subsynchronous dynamic stability device, and therefore described protected location comprises: line voltage overvoltage protective module 208, for when line voltage instantaneous value exceedes the threshold value of setting, sends trip signal to described subsynchronous dynamic stability device; And line voltage under-voltage protective module 209, for when line voltage instantaneous value is lower than the threshold value set, send trip signal to described subsynchronous dynamic stability device.
Six, synchronous phase sequence
Sometimes on-the-spot synchronizing signal can be connected into negative phase-sequence, and if now send the controlled range that trigger impulse can exceed subsynchronous dynamic stability device, cause uncertain result.Therefore, described protected location also comprises: synchronous phase sequence protection module 210, for when detecting that synchronizing signal is negative phase-sequence, sends trip signal to described subsynchronous dynamic stability device.
From such scheme; the major function that described protected location completes carries out signal compare and generate corresponding instruction according to signal comparative result; this is the basic function achieved by controller that this area is commonly used; therefore do not need to carry out the improvement on program and Software for Design, can directly adopt DSP common in prior art, single-chip microcomputer etc. as described protected location.
Corresponding above-mentioned multiplex protective device, present embodiment gives a kind of multiplex guard method of subsynchronous dynamic stability device, comprises the following steps: test the speed to generating set, and obtains two-way tach signal for subsequent use each other; Detect the current signal of described subsynchronous dynamic stability device, voltage signal and line voltage; And when two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device out of service.
The method realizes based on above-mentioned multiplex protective device, and much more no longer its concrete implementation detail is consistent with multiplex protective device, to state here.
Same reference diagram 1, present embodiment gives a kind of sub-synchronous oscillation restraining device, comprising: above-mentioned multiplex protective device 1; Subsynchronous dynamic stability device 30, it is arranged between generating set and electrical network, for sending the electric current for suppressing sub-synchronous oscillation to generating set and electrical network; And control unit 40; it is connected between described protected location 20 and described subsynchronous dynamic stability device 30, calculates for the tach signal according to generating set the control impuls driving described subsynchronous dynamic stability device to send the electric current for suppressing sub-synchronous oscillation.
Wherein, described protected location can be integrated in described control unit, and both all can adopt the realizations such as DSP general in prior art, single-chip microcomputer.
In addition, the PWM modulation technology that the method that described control unit produces control impuls can adopt this area general realizes, pass through PWM modulation technology, produce pwm pulse, to drive the IEGT phase module in the valve group of subsynchronous dynamic stability device, thus subsynchronous dynamic stability device is made to carry out the suppression of sub-synchronous oscillation.
In sum; present embodiments provide for a kind of multiplex protective device and method of subsynchronous dynamic stability device; protection generating set, the impact not disturbed by fault each other; wherein relate to the rotating speed abnormal protection of generating set, the quick-break overcurrent protection of subsynchronous dynamic stability device, 1 section of overcurrent protection of subsynchronous dynamic stability device, the overvoltage protection of subsynchronous dynamic stability device, the under-voltage protection of subsynchronous dynamic stability device, the overvoltage of valve group capacitance module and under-voltage protection, synchronous phase sequence etc.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different execution mode of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a multiplex protective device for subsynchronous dynamic stability device, described subsynchronous dynamic stability device is arranged between generating set and electrical network, it is characterized in that, described multiplex protective device comprises:
Test the speed unit, and it connects generating set, for testing the speed to generating set, and obtains two-way tach signal for subsequent use each other; And
Protected location; test the speed described in its connection unit and described subsynchronous dynamic stability device; for obtaining tach signal from the described unit that tests the speed; also for detecting the current signal of described subsynchronous dynamic stability device, voltage signal and line voltage; and when two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device out of service.
2. multiplex protective device according to claim 1, is characterized in that, described protected location comprises:
Rotary speed of generator group protection module, for when described two-way tach signal is all abnormal, sends trip signal to described subsynchronous dynamic stability device.
3. multiplex protective device according to claim 1, is characterized in that, described protected location comprises:
Quick-break overcurrent protection module, when the current instantaneous value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, sends locking order to described subsynchronous dynamic stability device; And
1 section of overcurrent protection module, exceedes the threshold value of setting for the current effective value on the arbitrary arm of valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, sends locking order to described subsynchronous dynamic stability device.
4. multiplex protective device according to claim 1, is characterized in that, described protected location comprises:
Valve group electric voltage over press protection module, exceedes the threshold value of setting for the voltage effective value in the valve group subsynchronous dynamic stability device being detected, and when exceeding the time of setting, sends trip signal to described subsynchronous dynamic stability device; And
Valve group under-voltage protection module, for the threshold value of the voltage effective value in the valve group subsynchronous dynamic stability device being detected lower than setting, and when reaching the time of setting, sends trip signal to described subsynchronous dynamic stability device.
5. multiplex protective device according to claim 1, is characterized in that, described protected location comprises:
Capacitance voltage overvoltage protective module, when the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected exceedes the threshold value of setting, sends trip signal to described subsynchronous dynamic stability device; And
Capacitance voltage under-voltage protective module, for the capacitance voltage instantaneous value in the valve group subsynchronous dynamic stability device being detected lower than setting threshold value time, send trip signal to described subsynchronous dynamic stability device.
6. multiplex protective device according to claim 1, is characterized in that, described protected location comprises:
Line voltage overvoltage protective module, for when line voltage instantaneous value exceedes the threshold value of setting, sends trip signal to described subsynchronous dynamic stability device; And
Line voltage under-voltage protective module, for when line voltage instantaneous value is lower than the threshold value set, sends trip signal to described subsynchronous dynamic stability device.
7., according to described multiplex protective device arbitrary in claim 1 to 6, it is characterized in that, described protected location also comprises:
Synchronous phase sequence protection module, for when detecting that synchronizing signal is negative phase-sequence, sends trip signal to described subsynchronous dynamic stability device.
8. a multiplex guard method for subsynchronous dynamic stability device, described subsynchronous dynamic stability device is arranged between generating set and electrical network, it is characterized in that, comprises the following steps:
Generating set is tested the speed, and obtains two-way tach signal for subsequent use each other;
Detect the current signal of described subsynchronous dynamic stability device, voltage signal and line voltage; And
When two-way tach signal is all abnormal or detect current signal, voltage signal and line voltage exceed or threshold value lower than setting time, make described subsynchronous dynamic stability device out of service.
9. a sub-synchronous oscillation restraining device, is characterized in that, comprising:
Arbitrary described multiplex protective device in claim 1 to 7;
Subsynchronous dynamic stability device, it is arranged between generating set and electrical network, for sending the electric current for suppressing sub-synchronous oscillation to generating set and electrical network; And
Control unit, it is connected between described protected location and described subsynchronous dynamic stability device, calculates for the tach signal according to generating set the control impuls driving described subsynchronous dynamic stability device to send the electric current for suppressing sub-synchronous oscillation.
10. sub-synchronous oscillation restraining device according to claim 9, is characterized in that, described protected location is integrated in described control unit.
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| CN105576688A (en) * | 2015-12-28 | 2016-05-11 | 国网辽宁省电力有限公司电力科学研究院 | Control protection method for flexible direct current power transmission system |
| CN107623336A (en) * | 2017-09-22 | 2018-01-23 | 中国南方电网有限责任公司 | Method and apparatus based on HVDC rectification side converter optimized synchronization machine sub-synchronous oscillations |
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Address after: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Co-patentee after: BEIJING GUOHUA POWER Co.,Ltd. Patentee after: China Shenhua Energy Co.,Ltd. Co-patentee after: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Co-patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Co-patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Co-patentee before: BEIJING GUOHUA POWER Co.,Ltd. Patentee before: China Shenhua Energy Co.,Ltd. Co-patentee before: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Co-patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. Co-patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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Effective date of registration: 20190411 Address after: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Co-patentee after: BEIJING GUOHUA POWER Co.,Ltd. Patentee after: China Shenhua Energy Co.,Ltd. Co-patentee after: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Co-patentee after: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Co-patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Co-patentee before: BEIJING GUOHUA POWER Co.,Ltd. Patentee before: China Shenhua Energy Co.,Ltd. Co-patentee before: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Co-patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Co-patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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Address after: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee after: China Shenhua Energy Co.,Ltd. Patentee after: BEIJING GUOHUA POWER Co.,Ltd. Patentee after: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Patentee after: Rongxin Huike Electric Co.,Ltd. Patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 100011 Shenhua building, 22 West Binhe Road, Dongcheng District, Beijing Patentee before: China Shenhua Energy Co.,Ltd. Patentee before: BEIJING GUOHUA POWER Co.,Ltd. Patentee before: INNER MONGOLIA GUOHUA HULUN BUIR POWER GENERATION Co.,Ltd. Patentee before: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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