CN110067603B - Control and stability method for waste heat steam turbine generator in offshore power grid-connected operation - Google Patents
Control and stability method for waste heat steam turbine generator in offshore power grid-connected operation Download PDFInfo
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- CN110067603B CN110067603B CN201910273311.8A CN201910273311A CN110067603B CN 110067603 B CN110067603 B CN 110067603B CN 201910273311 A CN201910273311 A CN 201910273311A CN 110067603 B CN110067603 B CN 110067603B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/60—Application making use of surplus or waste energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/76—Application in combination with an electrical generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/01—Purpose of the control system
- F05D2270/06—Purpose of the control system to match engine to driven device
- F05D2270/061—Purpose of the control system to match engine to driven device in particular the electrical frequency of driven generator
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Abstract
A control and stability method for the grid-connected operation of a waste heat steam turbine generator on an offshore power grid relates to a control technology for the grid-connected operation of the waste heat steam turbine generator on the offshore power grid. The method comprises the following steps: s1, the waste heat generator performs grid-connected power generation according to the maximum output power capacity of the waste heat generator, the gas turbine generators in the same power station with the waste heat generator perform grid-connected operation in a constant active power output mode, and the gas turbine generators in the other power stations perform grid-connected power generation in an active power equal proportion operation mode; and S2, determining a grid reference frequency sampling point, and realizing the frequency stability of the whole grid through the frequency increasing and frequency reducing adjustment of the gas turbine generator. The invention can smoothly bring the waste heat turbine generator of the power station into the power grid and stably and safely operate, and obtains good energy-saving and emission-reducing effects and economic benefits.
Description
Technical Field
The invention relates to a control technology for the grid-connected operation of a waste heat turbine generator on an offshore power grid.
Background
The existing control strategy for the grid-connected operation of the offshore power grid generator is generally that the balance between the total output of the power grid generator and the total load of a power grid is achieved by controlling the active output and the reactive output of each generator, and the control strategy is specific to a gas or fuel generator. The new energy generator, especially the afterheat turbine generator, is used in sea power network for the first time, and is powered with the afterheat of other gas turbine to produce electricity. From the perspective of improving the energy utilization rate, the power grid stability should not be achieved by controlling or limiting the output of the waste heat turbine generator. In addition, the installed capacity of the waste heat turbine generator is generally several times of that of the gas turbine generator, and the adjustment response of the waste heat turbine generator is slow, and the adjustment response speed is not as fast as that of the gas turbine generator. Finally, at present, no power grid stability strategy for a generator which utilizes energy sources such as a waste heat generator in a circulating manner exists in an offshore power grid, and the current preferential tripping calculation mode cannot be applied to a waste heat turbine and a gas turbine generator which generates waste heat. Therefore, the current offshore power grid control strategy and the current stabilization strategy cannot be used in the power grid with the waste heat turbine generator.
Disclosure of Invention
The invention aims to provide a method for controlling and stabilizing the grid-connected operation of a waste heat turbine generator capable of stably and safely operating on an offshore power grid.
The purpose of the invention can be realized by designing a method for controlling and stabilizing the grid-connected operation of the waste heat steam turbine generator on the offshore power grid, which comprises the following steps:
s1, the waste heat generator performs grid-connected power generation according to the maximum output power capacity of the waste heat generator, the gas turbine generators in the same power station with the waste heat generator perform grid-connected operation in a constant active power output mode, and the gas turbine generators in the other power stations perform grid-connected power generation in an active power equal proportion operation mode;
and S2, determining a grid reference frequency sampling point, and realizing the frequency stability of the whole grid through the frequency increasing and frequency reducing adjustment of the gas turbine generator.
Further, the sampling point of the grid reference frequency is 50 Hz.
Further, the method for calculating the active hot standby after the generator trips when the waste heat turbine is on line comprises the following steps:
active hot standby after the residual heat turbine trips: the hot standby value of the waste heat generator trip is the corrected value of the total maximum output-total load-delta of other on-grid units;
the active heat after the trip of the gas turbine generator of the same power station with the waste heat turbine is prepared: hot standby is the total maximum output of the on-grid generator-the maximum output of the trip generator-the total load-delta corrected value-the residual heat contribution value;
in the formula, the delta correction value is a calculation error estimation value, and is usually within the range of 0-1500 kW; the waste heat contribution value is the active power promoted by a waste heat turbine which is converted into the corresponding waste heat generated when the gas turbine operates with load;
and (3) the gas turbine generators of other power stations are in trip hot standby:
and hot standby is a corrected value of total maximum output of the on-grid generator-maximum output of the trip generator-total load-delta.
Furthermore, the residual heat contribution value of a single gas turbine generator is x + k.P,
in the formula, y: the residual heat contribution value of the turbine unit, x: the residual heat contribution value when the turbine set is in no load, k: the active power output ratio of the turbine set in loading is P: the real-time active power output of the turbine set under load
The invention can smoothly bring the waste heat turbine generator of the power station into the power grid and stably and safely operate, and obtains good energy-saving and emission-reducing effects and economic benefits.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a first power station in accordance with a preferred embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
A method for controlling and stabilizing the grid-connected operation of a waste heat steam turbine generator on an offshore power grid comprises the following steps:
s1, the waste heat generator performs grid-connected power generation according to the maximum output power capacity of the waste heat generator, the gas turbine generators in the same power station with the waste heat generator perform grid-connected operation in a constant active power output mode, and the gas turbine generators in the other power stations perform grid-connected power generation in an active power equal proportion operation mode;
and S2, determining a grid reference frequency sampling point, and realizing the frequency stability of the whole grid through the frequency increasing and frequency reducing adjustment of the gas turbine generator. In this embodiment, the sampling point of the grid reference frequency is 50 Hz.
As shown in figure 1, when the waste heat turbine generators exist in the offshore power grid and are operated in a grid-connected mode to generate power, the control strategy of the generators in the first power station to the fourth power station is adopted. Because the installed capacity of the waste heat turbine generator is large, and the adjusting response speed is slow, the waste heat turbine generator is subjected to the non-adjusting principle, namely, grid-connected power generation is carried out according to the maximum output power capacity of the waste heat generator. And for the gas turbine generators belonging to the same power station as the waste heat turbine generator, the gas turbine generators not only need to supply power to an offshore power grid, but also undertake the task of providing waste heat for the waste heat turbine. Therefore, in order to ensure the stability of the delivered residual heat capacity, the six gas turbine generators of the first power station are subjected to grid-connected operation in a constant active power output mode, so that the output active power of the residual heat turbine generators is indirectly ensured not to have large fluctuation.
The waste heat turbine generator has large installed capacity and bears the main load of power utilization of a power grid. Therefore, the gas turbine generators in the rest two power stations, the rest three power stations and the rest four power stations can adopt an active power equal proportion operation mode to carry out grid-connected power generation. Meanwhile, 50Hz is taken as a sampling point of the power grid reference frequency, and the frequency stability of the whole power grid is realized through the frequency increasing and reducing regulation functions of the gas turbine generator.
The method reforms an offshore power grid electric power management strategy and a power grid stability strategy according to the difference between the control characteristics and the electrical characteristics of the waste heat steam turbine generator and the original gas turbine generator, stabilizes the frequency of the whole power grid by controlling the frequency of the offshore power grid gas turbine generator, and does not maintain the stability of the power grid by controlling the frequency and the voltage of the waste heat steam turbine generator. And the influence of the gas turbine generator on the offshore power grid when tripping is generated is accurately obtained by calculating the residual heat contribution value of the gas turbine generator, so that the balance of the output of the offshore power grid generator set and the power load is ensured by correspondingly unloading part of the power load. The invention provides a good solution for how a new energy generator, particularly a waste heat turbine generator, and an original gas turbine generator are operated in a grid-connected mode, provides a new idea for guaranteeing stable operation of an offshore power grid, and has great popularization significance.
As shown in fig. 2, the existence of the waste heat turbine generator changes the stability strategy of the offshore power grid. The waste heat of the waste heat turbine generator is derived from six gas turbine generators of the first power station, and the waste heat generated by combustion of the gas turbine generator is conveyed to a waste heat boiler through a pipeline so as to drive the waste heat turbine to generate power. Therefore, the turbine generator in each operation of the first power station is crucial to the waste heat turbine generator. Once one gas turbine generator is reduced, the active power output of the waste heat turbine generator is reduced, so that it is necessary to analyze the contribution value of each gas turbine generator of the first power station to the active power output of the waste heat turbine generator. Meanwhile, once the waste heat turbine generator runs in the network, the stability strategy of the whole offshore power grid cannot simply calculate the hot standby of a single gas turbine jump machine like the previous stability strategy.
The active thermal standby calculation method after the tripping of the generator when the waste heat turbine is on line comprises the following steps:
active hot standby after the residual heat turbine trips: the hot standby value of the waste heat generator trip is the corrected value of the total maximum output-total load-delta of other on-grid units;
active hot standby after the trip of a gas turbine generator in a power station: hot standby is the total maximum output of the on-grid generator-the maximum output of the trip generator-the total load-delta corrected value-the residual heat contribution value;
in the formula, the delta correction value is a calculation error estimation value, and is usually within the range of 0-1500 kW; the waste heat contribution value is the active power promoted by a waste heat turbine which is converted into the corresponding waste heat generated when the gas turbine operates with load;
and the second, third and fourth gas turbine generators of the power station jump and are hot-standby:
hot standby is the corrected value of total maximum output of on-grid generator-maximum output of trip generator-total load-delta
Since the residual heat of the gas turbine generator in the first power station is lost after tripping, and the active power output of the residual heat turbine generator is reduced, the residual heat contribution value of a single gas turbine generator needs to be calculated by the following method.
The residual heat contribution value of a single gas turbine generator is x + k.P,
in the formula, y: the residual heat contribution value of the turbine unit, x: the residual heat contribution value when the turbine set is in no load, k: the active power output ratio of the turbine set in loading is P: the turbine set has real-time active power output when loaded.
Because k and P are known during actual operation, and the residual heat contribution value x of the gas turbine generator under no load can be measured through an actual load test. Therefore, the residual heat contribution values of the six gas turbine generators of the first power station to the active power output of the residual heat turbine are respectively as follows:
residual heat contribution of the power station-gas turbine generator 1: y1 ═ x1+ k 1. P1
Residual heat contribution of the power station-gas turbine generator 2: y2 ═ x2+ k 2. P2
Residual heat contribution of the power station-gas turbine generator 3: y3 ═ x3+ k 3. P3
Residual heat contribution of the power station-gas turbine generator 4: y4 ═ x4+ k 4. P4
Residual heat contribution of the power station-gas turbine generator 5: y5 ═ x5+ k 5. P5
Residual heat contribution of the power station-gas turbine generator 6: y6 ═ x6+ k 6. P6
Example (b): a certain power grid is positioned in the sea area of south China sea and consists of a terminal power station, a 12-1PUQB power station and a 11-1 power station, wherein 15 gas turbine generators and 1 waste heat turbine generator are used for supplying power to each power station and the rest 15 offshore platforms, and the total installed capacity is 88 MW.
The terminal power station has 6 gas turbine generators and 1 waste heat turbine generator, wherein the maximum active power output of each of the 4 Siemens gas turbine generators is 3200 kW; 2 Ukrainian gas turbine generators, and 3500kW of maximum active power output of a single generator. The waste heat generated when the 6 gas turbine generators operate provides a waste heat source for the waste heat turbine generator, and the maximum active power output of the waste heat turbine generator is 10000 kW. The 12-1 power station has 3 Siemens gas turbine generators in total, and the maximum active power output of a single generator is 3500 kW. The 12-1PUQB power station has 4 cable-stayed gas turbine generators, and the maximum active power output of a single generator is 6400 kW. 28064The Zhou 11-1 power station has 2 cable gas turbine generators, and the maximum active power output of a single generator is 2300 kW.
By utilizing the construction method, the waste heat turbine generator of the terminal power station is smoothly brought into a power grid, and the waste heat turbine generator stably and safely operates, so that good energy-saving and emission-reducing effects and economic benefits are obtained.
The invention optimizes the new energy generator, particularly the waste heat turbine generator, on the basis of the control mode of the former generator when the new energy generator, particularly the waste heat turbine generator, is applied to the offshore power grid, so as to achieve the stable frequency of the power grid on the premise of enabling the waste heat generator to achieve the maximum output effect and ensure the stable operation of each gas turbine unit and each waste heat turbine generator unit of the power grid. Meanwhile, by providing the concept of the waste heat contribution value of the gas turbine generator, the algorithm of the active thermal standby of the power grid is optimized on the basis of the past, and a reliable means is provided for guaranteeing the stability of the operation of the power grid.
Claims (4)
1. A control and stability method for the grid-connected operation of a waste heat steam turbine generator on an offshore power grid is characterized by comprising the following steps:
s1, the waste heat generator performs grid-connected power generation according to the maximum output power capacity of the waste heat generator, the gas turbine generators in the same power station with the waste heat generator perform grid-connected operation in a constant active power output mode, and the gas turbine generators in the other power stations perform grid-connected power generation in an active power equal proportion operation mode;
and S2, determining a grid reference frequency sampling point, and realizing the frequency stability of the whole grid through the frequency increasing and frequency reducing adjustment of the gas turbine generator.
2. The method for controlling and stabilizing the grid-connected operation of the waste heat turbine generator on the offshore power grid according to claim 1, characterized by comprising the following steps of: the sampling point of the grid reference frequency is 50 Hz.
3. The control and stability method for the grid-connected operation of the waste heat turbine generator on the offshore power grid according to claim 1, wherein the active thermal standby calculation method after the generator tripping is performed when the waste heat turbine is on line is as follows:
active hot standby after the residual heat turbine trips: the hot standby value of the waste heat generator trip is the corrected value of the total maximum output-total load-delta of other on-grid units;
the active heat after the trip of the gas turbine generator of the same power station with the waste heat turbine is prepared: hot standby is the total maximum output of the on-grid generator-the maximum output of the trip generator-the total load-delta corrected value-the residual heat contribution value;
in the formula, the delta correction value is a calculation error estimation value, and is usually within the range of 0-1500 kW; the waste heat contribution value is the active power promoted by a waste heat turbine which is converted into the corresponding waste heat generated when the gas turbine operates with load;
and (3) the gas turbine generators of other power stations are in trip hot standby:
and hot standby is a corrected value of total maximum output of the on-grid generator-maximum output of the trip generator-total load-delta.
4. The method for controlling and stabilizing the grid-connected operation of the waste heat turbine generator on the offshore power grid according to claim 1, characterized by comprising the following steps of: the residual heat contribution value of a single gas turbine generator is x + k.P,
in the formula, y: the residual heat contribution value of the turbine unit, x: the residual heat contribution value when the turbine set is in no load, k: the active power output ratio of the turbine set in loading is P: the turbine set has real-time active power output when loaded.
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