CN108879791B - Isolated grid steam-electricity balancing method - Google Patents
Isolated grid steam-electricity balancing method Download PDFInfo
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- CN108879791B CN108879791B CN201710333823.XA CN201710333823A CN108879791B CN 108879791 B CN108879791 B CN 108879791B CN 201710333823 A CN201710333823 A CN 201710333823A CN 108879791 B CN108879791 B CN 108879791B
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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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- 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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention provides an isolated grid steam-electricity balancing method, which comprises the following steps: s1, setting a difference adjustment coefficient of a steam turbine in the thermoelectric system; s2, cutting off corresponding loads according to the power supply incoming quantity of a power supply connecting line after isolated network occurs, and simultaneously ensuring that the total steam demand of the residual loads is less than the maximum supply of the machine furnace; s3, switching a steam turbine in a power control mode into primary frequency modulation, simultaneously automatically or manually improving the output of the thermoelectric generator set, and switching into secondary frequency modulation according to the capacity of a thermoelectric system after the frequency is stabilized; and S4, switching the thermoelectric system from the operation mode of fixing the steam and the electricity to the operation mode of fixing the steam and the electricity so as to preferentially ensure the electric load balance, and switching back to the operation mode of fixing the steam and the electricity after the electric load balance. The invention can quickly and effectively carry out steam-electricity balance when an enterprise generates an isolated network, thereby improving the continuity and stability of enterprise production.
Description
Technical Field
The invention relates to the technical field of power system stability control, in particular to a steam-electricity balance method for an isolated grid.
Background
Large-scale industrial enterprises mainly refer to petroleum, chemical industry, steel, nonferrous metal, cement and the like, and the enterprises have high energy consumption and high requirement on energy supply reliability. The enterprises have cogeneration units for providing heat energy and electric energy, the cogeneration units generally adopt a steam-fixed-power operation mode to preferentially ensure steam supply, and the shortage of the electric energy is provided by an external power grid. After the connecting line fails, the isolated network reliability of the enterprise is reduced, and the power failure accident of the whole plant is easily caused and a secondary accident is caused.
The thermoelectric system comprises a boiler, a steam turbine, a generator system and an auxiliary system, and when the electric load and the thermal load change, the three coordinate to maintain the stable operation of the unit. The main steam pressure reflects the balance state of the steam system, the pressure is constant when the steam system operates normally, the pressure is reduced when the steam load is increased suddenly, the pressure is increased when the steam load is reduced suddenly, and the pressure is recovered to be stable by increasing and decreasing the output of the boiler. The frequency reflects the power balance state of the power system, the power supply is balanced during normal operation, the frequency is kept stable, the power balance is damaged after isolated network, the frequency fluctuates, and the premise that the enterprise power grid is stable is that a rapid power control means is provided.
The isolated power grid stability control problem of the enterprise needs to consider not only electric power balance but also thermal power balance, which is different from the maximum stability control problem of the public power grid. The stability control of the public power grid only considers the balance of electricity generally, and in order to keep the normal operation of the device, the enterprise power grid needs to ensure the balance of electricity and steam at the same time, and the coupling of the electricity and the steam increases the difficulty for the control.
The enterprise power grid usually operates in a steam-fixed power mode, a self-contained thermoelectric power unit ensures steam balance, and the insufficient power part is provided by an external power grid. The self-contained power plant does not bear the frequency modulation task, so that part of thermal power plants set the power generation control as power control, and the power control cannot maintain the frequency stability of the power grid after the isolated power grid. When the thermal power plant is connected to the grid, the output change of the generator is mainly controlled by a dispatcher, the requirement on the difference adjustment coefficient is low, and the output distribution of the generator set after the isolated grid is determined by the difference adjustment coefficient, so that the power generation distribution after the isolated grid is unreasonable, the continuity of enterprise production is influenced, and the stability of enterprise production is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a steam-electricity balancing method for an isolated network, which can quickly and effectively carry out steam-electricity balancing when an enterprise is isolated, thereby improving the continuity and stability of enterprise production.
The invention provides a steam-electricity balancing method for an isolated grid, which comprises the following steps:
s1, setting a difference adjustment coefficient of a steam turbine in the thermoelectric system, wherein the setting principle is as follows: setting a first difference adjusting coefficient for the unit of which the adjusting speed is greater than or equal to a first preset speed threshold and the system capacity is greater than or equal to a first preset capacity threshold; setting a second difference adjusting coefficient for the unit of which the adjusting speed is less than a first preset speed threshold and the system capacity is less than a first preset capacity threshold, wherein the first difference adjusting coefficient is less than the second difference adjusting coefficient;
s2, cutting off corresponding loads according to the power supply incoming quantity of a power supply connecting line after isolated network occurs, and simultaneously ensuring that the total steam demand of the residual loads is less than the maximum supply of the machine furnace; when load shedding is carried out, loads with the generating capacity smaller than the power consumption are shed, meanwhile, emergency loads, security loads and preset important process loads in the primary loads are eliminated, and a shedding sequence is determined for the secondary loads according to power shortage;
s3, switching a steam turbine in a power control mode into primary frequency modulation, simultaneously automatically or manually improving the output of the thermoelectric generator set, and switching into secondary frequency modulation according to the capacity of a thermoelectric system after the frequency is stabilized;
and S4, switching the thermoelectric system from the operation mode of fixing the steam and the electricity to the operation mode of fixing the steam and the electricity so as to preferentially ensure the electric load balance, and switching back to the operation mode of fixing the steam and the electricity after the electric load balance.
Further, the method further comprises:
and S5, after the working mode of steam power fixation is switched back, steam balance is carried out, the pressure of the steam extraction pipeline is recovered to be the rated pressure, and the output of the generator is finely adjusted, so that the output rationality of the unit is improved.
Further, when the load is cut off, the under-cut proportion is ensured to be 5-10%.
Further, when load shedding is carried out, if the thermoelectric system is in a state of sufficient steam, the load with the gas production amount larger than the gas consumption amount and the power generation amount smaller than the gas consumption amount can be shed; otherwise, cutting off the load with the gas production amount less than the gas consumption amount and the power generation amount less than the gas consumption amount.
Further, when the thermoelectric system is switched from the working mode of fixing the electricity by steam to the working mode of fixing the steam by electricity, if the load of which the gas production is greater than the gas consumption and the power generation is less than the power consumption is cut off in S2, the closing amplitude of the steam extraction valve is minimum; if the load that the gas production is smaller than the gas consumption and the load that the power generation is smaller than the power consumption are cut off in the step S2, if the total amount of steam is increased, the closing amplitude of the steam extraction valve is medium, and if the total amount of steam is decreased, the closing amplitude of the steam extraction valve is maximum.
According to the technical scheme, the difference adjustment coefficient of each steam turbine is preset before enterprise isolated network, so that all units participate in frequency adjustment at the same time, the system frequency adjustment capacity is enhanced, and after enterprise isolated network occurs, corresponding loads are cut according to the power supply connecting line power input quantity, and the working load of the thermoelectric system is reduced. In addition, the frequency modulation of the power control turbine is switched to primary frequency modulation so as to improve the stability of the system. More importantly, when an enterprise is isolated from a network, the method switches the working mode of the thermoelectric system for determining the power by steam into the working mode for determining the steam by electricity, and makes full use of the characteristic of large inertia of the steam system to preferentially ensure the balance of electric loads and then ensure the balance of the steam, so that the method can effectively avoid the frequency fluctuation or power failure accidents of the power system. In conclusion, the isolated grid steam-electricity balancing method provided by the invention can be used for quickly and effectively balancing steam and electricity when an enterprise is isolated, so that the continuity and stability of enterprise production can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of an isolated grid steam-electricity balancing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the setting of the adjustment coefficient according to an embodiment of the present invention;
FIG. 3 is a diagram of a primary frequency adjustment setting provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electrical constant load arrangement provided in accordance with an embodiment of the present invention;
fig. 5 is another flow chart of a method for isolated grid steam-electricity balance provided by an embodiment of the present invention;
fig. 6 is a diagram of a chirp setup provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides an isolated grid steam-electricity balancing method, and referring to fig. 1, the method includes the following steps:
step 101: setting the difference adjustment coefficient of a steam turbine in a thermoelectric system, wherein the setting principle is as follows: setting a first difference adjusting coefficient for the unit of which the adjusting speed is greater than or equal to a first preset speed threshold and the system capacity is greater than or equal to a first preset capacity threshold; and setting a second difference adjusting coefficient for the unit with the adjusting speed smaller than the first preset speed threshold and the system capacity smaller than the first preset capacity threshold, wherein the first difference adjusting coefficient is smaller than the second difference adjusting coefficient.
In the step, corresponding difference adjustment coefficients are respectively set for each steam turbine, so that all units bear the variation of the electric load together, the setting principle is that a smaller difference adjustment coefficient is selected for a unit with high adjusting speed and large system capacity, and a larger difference adjustment coefficient is selected for a unit with insufficient adjusting capacity and small system capacity. Meanwhile, the difference adjustment coefficient cannot be set to be too small or too large, the too small system is aggravated in vibration, the stabilization time is long, the too large system is insufficient in adjustment capacity, and the frequency deviation is large. Generally, the setting range of the adjustment coefficient is 0.03-0.06.
Taking the dual-machine system shown in fig. 2 as an example, when both machines have the adjusting capability,
1 machineWhen having the adjusting capability
2 when the machine has the adjusting capacity
Wherein Q is1、Q2For rated power of the unit, sigma1％、σ2% is the coefficient of variation, KG、KG1、KG2The power is regulated in units.
Therefore, when the two units have the adjusting capacity, the unit adjusting power is maximum, the frequency change is minimum, and the adjusting capacity is strongest. Referring to fig. 2, in order to enable 2 units to have the adjustment capability at the same time, the setting principle is that the unit 2 with high adjustment speed and large system capacity selects a small adjustment coefficient, and the unit 1 with insufficient adjustment capability and small system capacity selects a large adjustment coefficient, so that the 2 units can be ensured to have the adjustment capability at the same time in the adjustment process.
If the unit 2 reaches the output limit first during the frequency reduction and only the unit 1 is involved in the frequency regulation, the unit regulation power will become small, resulting in large frequency fluctuations and thus poor regulation capacity. Therefore, in this step, it is necessary to set reasonable difference adjustment coefficients for different turbines, so that all units can bear the electrical load variation in the whole process, thereby improving the adjustment capability.
Step 102: after the isolated network occurs, cutting off corresponding loads according to the power supply incoming quantity of a power supply connecting line, and simultaneously ensuring that the total steam demand of the residual loads is less than the maximum supply of the machine furnace; when the load is cut off, the load with the generating capacity smaller than the power consumption is cut off, meanwhile, the emergency load, the security load and the preset important process load in the first-level load are removed, and the cutting-off sequence of the second-level load is determined according to the power shortage.
In this step, taking a large petrochemical enterprise as an example, the load types of the enterprise are first sorted, and the loads that can be cut off are determined. The cutting principle is that according to the power supply connecting line power input quantity, the corresponding load is cut off. And cutting off the load with the load power lower than the preset value of the power input power, for example, cutting off the load with the power slightly lower than the power input power, preferably, the under-cut proportion is 5-10%, and simultaneously ensuring that the total steam demand of the residual load is less than the maximum supply of the machine furnace. Wherein, emergency load, security load, preset important process load in the first-level load are isolated network uninterrupted power load, and the second-level load determines the cutting sequence according to the power shortage. Specifically, when determining to cut off the load, the steam consumption and the electricity consumption of the load are considered at the same time, as shown in table 1. The cutting mode 2 is suitable for being applied to the conditions of sufficient steam and limited power generation, the cutting mode 4 is wide in application range, the steam variation is small after cutting, and the isolated network is easy to transition to a balanced state.
TABLE 1
Note: the produced steam is load self-produced steam, and the power generation is load matched backpressure unit power generation;
step 103: and switching the steam turbine in a power control mode into primary frequency modulation, simultaneously automatically or manually improving the output of the thermoelectric unit, and switching into secondary frequency modulation according to the capacity of the thermoelectric system after the frequency is stabilized.
In the step, a frequency modulation mode is set, and as many units as possible work in a primary frequency modulation state after isolated network. The more the primary frequency modulation units in the isolated network are, the stronger the stability is, the less the primary frequency modulation units are, the worse the stability is, all the units are power controlled and do not have stability, and the system can be out of stability due to smaller power deviation. The unit regulation power of all the units is KG＝KG1+KG2+......KGnIf the unit regulating power K of a certain unit appearsGPAt 0, the system's capability to adjust is obviously reduced. The primary frequency modulation setting mode is shown in fig. 3.
Step 104: the method comprises the steps of switching a thermoelectric system from a steam-fixed working mode to an electric steam-fixed working mode to preferentially ensure electric load balance, and switching back to the steam-fixed working mode after the electric load balance.
In this step, when the isolated grid occurs, if the boiler capacity is small, the steam extraction amount is insufficient, and the steam extraction and power generation capacity cannot be improved at the same time. Therefore, under the isolated grid condition, the working mode of the thermoelectric system is changed from the mode of fixing the power by steam to the mode of fixing the steam by electricity, the characteristic of large inertia of the steam system is utilized, the balance of electric load is preferentially ensured, and then the steam extraction pressure is gradually increased to a normal value.
For example, in the case of the cut-off mode 2 in table 1, the closing amplitude of the steam extraction valve is the smallest, and in the case of the cut-off mode 4, the closing amplitude of the steam extraction valve is medium, for example, the closing amplitude of the steam extraction valve is the largest, for example, the total amount of steam is reduced.
In the initial stage after the isolated network, the valve opening is controlled by a stability control system, specifically, pressure reduction setting control or valve position control can be adopted, as shown in fig. 4. The pressure reduction given control is indirect control, after the pressure given set value is reduced, the set value is smaller than the pressure of a steam transmission pipeline, the steam extraction regulating valve is closed, more steam flows to the condenser, and power generation is increased. The valve position control is direct control, the stable control system directly closes the opening of the steam extraction valve, the action speed is high, and the effect is obvious.
According to the isolated network steam-electricity balancing method provided by the embodiment of the invention, a proper difference adjustment coefficient is preset for each steam turbine before isolated network of an enterprise occurs, so that all units can simultaneously participate in frequency adjustment, the frequency adjustment capability of a system is enhanced, and after isolated network of the enterprise occurs, corresponding loads are cut off according to the power supply connecting line electricity intake quantity, so that the working load of a thermoelectric system is reduced. In addition, the turbine of the power control mode is switched to primary frequency modulation so as to improve the stability of the system. More importantly, when an enterprise is isolated from a network, the method switches the working mode of the thermoelectric system for determining the power by steam into the working mode for determining the steam by electricity, and makes full use of the characteristic of large inertia of the steam system to preferentially ensure the balance of electric loads and then ensure the balance of the steam, so that the embodiment of the invention can effectively avoid the frequency fluctuation or power failure accidents of the power system. In conclusion, the isolated grid steam-electricity balancing method provided by the embodiment of the invention can quickly and effectively carry out steam-electricity balancing when an enterprise is isolated, so that the continuity and stability of enterprise production can be improved.
In an alternative embodiment, referring to fig. 5, the method further comprises:
step 105: and after the working mode of steam power fixation is switched back, steam balance is carried out, so that the pressure of the steam extraction pipeline is recovered to be the rated pressure, and the output of the generator is finely adjusted, so that the output rationality of the unit is improved.
In the step, after the isolated grid power load is balanced, steam balance is carried out, and finally the output of the generator is finely adjusted. The steam balance can be manually intervened, and can also be restored to pressure control, and the system is automatically adjusted. The set value of the output of the generator is manually set, so that the output of each generator tends to be reasonable. If the system capacity is sufficient or grid connection needs exist, secondary frequency modulation is put into use, and as shown in fig. 6, the system frequency is restored to the rated frequency.
In an alternative embodiment, an under-cut ratio of 5% to 10% is ensured when load shedding is performed.
In an optional embodiment, when the load is removed, if the steam of the thermoelectric system is sufficient, the load with the gas production amount larger than the gas consumption amount and the power generation amount smaller than the gas consumption amount is removed; otherwise, cutting off the load with the gas production amount less than the gas consumption amount and the power generation amount less than the gas consumption amount.
In an alternative embodiment, when the thermoelectric system is switched from the operation mode of fixing the electricity by steam to the operation mode of fixing the steam by electricity, if the load that the gas production is greater than the gas consumption and the power generation is less than the gas consumption is cut off by S2, the closing amplitude of the steam extraction valve is minimum; if the load that the gas production is smaller than the gas consumption and the load that the power generation is smaller than the power consumption are cut off in the step S2, if the total amount of steam is increased, the closing amplitude of the steam extraction valve is medium, and if the total amount of steam is decreased, the closing amplitude of the steam extraction valve is maximum.
According to the description, the isolated grid steam-electricity balance method provided by the embodiment of the invention can effectively realize isolated grid electricity and heat load balance by reasonably setting the load to be cut off, changing the frequency modulation mode of the unit and changing the thermoelectric control mode.
In the description of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A isolated grid steam-electricity balancing method is characterized by comprising the following steps:
s1, setting a difference adjustment coefficient of each turbine in the thermoelectric system, wherein the setting principle is as follows: setting a first difference adjusting coefficient for the unit of which the adjusting speed is greater than or equal to a first preset speed threshold and the system capacity is greater than or equal to a first preset capacity threshold; setting a second difference adjusting coefficient for the unit of which the adjusting speed is less than a first preset speed threshold and the system capacity is less than a first preset capacity threshold, wherein the first difference adjusting coefficient is less than the second difference adjusting coefficient;
s2, cutting off corresponding loads according to the power supply incoming quantity of a power supply connecting line after isolated network occurs, and simultaneously ensuring that the total steam demand of the residual loads is less than the maximum supply of the machine furnace; when load shedding is carried out, loads with the generating capacity smaller than the power consumption are shed, meanwhile, emergency loads, security loads and preset important process loads in the primary loads are eliminated, and a shedding sequence is determined for the secondary loads according to power shortage;
s3, switching a steam turbine in a power control mode into primary frequency modulation, simultaneously automatically or manually improving the output of the thermoelectric generator set, and switching into secondary frequency modulation according to the capacity of a thermoelectric system after the frequency is stabilized;
s4, switching the thermoelectric system from the working mode of fixing the power by steam to the working mode of fixing the steam by electricity to preferentially ensure the electric load balance, and switching back to the working mode of fixing the power by steam after the electric load balance;
when load shedding is carried out, if the thermoelectric system is in a state of sufficient steam, the load with the gas production amount larger than the gas consumption amount and the power generation amount smaller than the gas consumption amount can be shed; otherwise, cutting off the load with the gas production amount smaller than the gas consumption amount and the power generation amount smaller than the power consumption amount;
when the working mode of the thermoelectric system is switched from the working mode of fixing the electricity by using steam to the working mode of fixing the steam by using electricity, if the load of which the gas production is greater than the gas consumption and the power generation is less than the power consumption is cut off in S2, the closing amplitude of the steam extraction valve is minimum; if the load that the gas production is smaller than the gas consumption and the load that the power generation is smaller than the power consumption are cut off in the step S2, if the total amount of steam is increased, the closing amplitude of the steam extraction valve is medium, and if the total amount of steam is decreased, the closing amplitude of the steam extraction valve is maximum.
2. The method of claim 1, further comprising:
and S5, after the working mode of steam power fixation is switched back, steam balance is carried out, the pressure of the steam extraction pipeline is recovered to be the rated pressure, and the output of the generator is finely adjusted, so that the output rationality of the unit is improved.
3. The method according to claim 1, characterized in that in the load shedding, an under-cut proportion of 5% to 10% is guaranteed.
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| CN103501145B (en) * | 2013-09-16 | 2016-05-11 | 贵州电网公司电网规划研究中心 | Power grid high-frequency stability forecast control method based on lonely net trend principle of transfer |
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| CN102510078A (en) * | 2011-10-23 | 2012-06-20 | 重庆市电力公司电力科学研究院 | Combined heat and power scheduling system and scheduling method for extraction and condensing unit |
| CN104104078A (en) * | 2014-01-27 | 2014-10-15 | 上海方能自动化系统科技有限公司 | Safety and stability control system control strategy for refinery enterprise electrical power system |
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