Method and device for rapid regulatory capacity of the power plant

 

(57) Abstract:

The invention is intended for use in the field of energy. In the method for fast power control power plant with turbine unit containing steam turbine (2, 4, b) and the generator (8) for the excess power of the generator (PSduring operation of the installation activate the available energy storage. To achieve a particularly effective regulation in addition to the power generator (PSP1attract at least one further characterizing the actual operating state of the process parameter (PWL, RFW, MPDDFD, KL, TV, P) to determine the set of specified values of the position (Y, DFD). A device for implementing the method comprises a regulating device, the input of which is filed with the values of power (PSP1generator (8) and at least one further process parameter (PWL, RFW, MPDDFD, KL, TV, P), and outputs which indicate the set values of the position (Y, DFDfor United with a steam turbine (2, 4, b) of Executive bodies. The invention improves the efficiency of regulation. 2 S. and 9 C. installation of turbine unit, containing steam turbine and generator, and for excess power of the generator during operation of the installation, activate the available energy storage. It relates further to a device for implementing the method.

Along with the development of frequency deviations within the energy supply system, in particular, must be observed given the exchange capacity on the ground due to the partial networks that make up the distribution network (United power grid or stand-alone grid). The requirement is therefore that the rapid increase in capacity of the power unit was available within seconds.

Opportunities for fast power control and support frequency described in the journal "VGB Kraftwerkstechnik", N 1, January 1980, pages 18-23. While for fast power control in the second range (quickly realized reserve) there are many at the same time or alternate produce of intervention options for the remaining changes in the power and energy of the block you want to change the fuel supply. Therefore, at the power plant running on fossil fuel, to overcome the time lag within the first seconds of the opening is essentially without delay activate and discharge drives available steam or energy.

In addition to increasing capacity by eliminating throttling control valves of the steam turbine also switch provided in the water / steam circuit of a steam turbine heaters that are heated by a pair of intermediate selection from the steam turbine. Directed simultaneously through the heater low pressure condensate stream in a few seconds may be terminated or re-raised. This measure for fast power control in power, fossil fuel, by turning off the heater supply condensate as further opportunities to activate held in reserve stores of energy are described, for example, in German patent DE-PS 33 04 292.

To regulate and/or control quickly implemented (second) of reserve, that is, the regulated use steam to flow regenerative heaters and/or capacitors for heating and steam for technological needs and condensate in the water / steam circuit of a steam turbine power block, typically use a regulating device. It calls for fast power control, that is, to enable the drive ski needs and/or throttling of the condensate. Set the position values for the adjustment of the valves in the outlets of the turbine and for the Executive bodies to regulate condensate formed in such a way that achieves the required excess capacity of the generator. The disadvantage, however, is that coordination as Executive links or Executive bodies in the lines of the turbine selection and regulation of condensate and auxiliary condensate is extremely difficult. In addition, are unaccounted priorities using separate activities for fast power control. In addition, due to the typical non-linear objects of regulation so far as regulation is not particularly high.

The basis of the invention therefore have the task of specifying how to quickly provide the power in the power plant, which is achieved particularly effective regulation. This should be achieved in the case of especially suitable for implementing the method of simple means.

On how this task according to the invention is solved due to the fact that in addition to generator power draw or use less is erator power plant thermal power as the future, characterizing the actual operating state of the process parameter to determine the set of values that position. Under power generator see valid or given power setting or the actual value of excess capacity or the maximum capacity of the generator.

This invention proceeds from the consideration that a combination of events and, thus, the strategy used to enable the energy storage should be determined taking into account the actual working condition and should be evaluated in many process variables or parameters of the process in the installation. To do this, the discharging and charging the available energy storage should be adjusted after evaluation of the request, excess capacity, and to enable the individual energy storage can be applied strategy use based on technical and economic aspects.

It is preferable to determine the current operating status of the entire installation or a separate power unit as an optional further process parameters used as cogeneration power installations and selected mass pot is in the surrounding area, associated with a steam turbine-side flow regulating valve in the fresh pair. In addition, it is advisable take into account future values or data about the limitations of energy storage, for example, on the possible load of the installation. Next, it is advisable take into account data on technological readiness or capability AK - cultivated individual energy storage, the content of which depends on flow fresh pair, pair selection, the spent steam and/or condensate in the water / steam circuit of a steam turbine.

Regarding the devices mentioned problem is solved according to the invention due to the regulating device, to the input of which is summarized assigned power (setpoint excess capacity and the actual capacity (actual excess capacity) generator, and at least the value of the heat capacity as a further process parameter, and the output of which is to enable the individual energy storage - issued set of position values for the associated with a steam turbine of the Executive bodies. Executive bodies can be control valves (pilot valves) fresh pair, a pair of selection or otrabotala breznay the form of the regulating device comprises a first regulating module, to the input of which is applied a given power and the actual power of the generator, and further process parameters or operating parameters, and the output of which indicates an equity value combinations of activities for submission to the available spare capacity. Preferably the first regulatory module contains the input for the degree of throttling at least one of the Executive body associated with a steam turbine-side tributary.

Suitable regulating device further includes a second regulatory module, an input connected with an outstanding combination of measures the output of the first regulating module, and the outputs of which give the values specified provisions for the Executive bodies of the pair. Connected on the output side of this regulatory module, acting as a regulator of correction of the third regulating module expediently has at the inputs of the power generator.

The regulating device comprises a further expedient fourth regulating module, the inputs of which are respectively connected to the output of the first and second regulatory module, and the outputs of which are given specified values of provisions for Executive argv is for correction or approval of the actual degree of throttling at least one of the Executive body.

Achieved by the invention advantages are, in particular, that by identifying combinations of events to enable the energy storage in the turbine unit to incorporate many of the essential for the installation process parameters is possible a particularly advantageous solution is often the opposite of the terms and requirements for activation of excess capacity. When applying the appropriate strategy to enable energy storage provides the best overall result. When creating a strategy can take into account constraints that are obtained as from the specified feed available to reserve regulation and guidance on supply current, steam for technological needs and/or cogeneration steam, and also for technological reasons.

An example of carrying out the invention is explained in more detail using the drawings. It is shown:

Fig. 1 block diagram of the turbine as a segment of the process of energy block and

Fig. 2 block diagram of the regulating device for the segment of the process according to Fig. 1.

Fig. 1 shows a principle block diagram of a segment of the process energy block with turboing is Noah the low-pressure turbine 6, and the generator 8. In the operation of the fresh steam turbine unit FD through the control valve fresh pair 10 is introduced into the partial high-pressure turbine 2. Installed through control valve 12 valve KL) partial stream FD1is selected from the partial high-pressure turbine 2 line of heated high-pressure 14. Spent steam FD2of the partial high-pressure turbine 2 flows through the intermediate superheater 16 partial to medium-pressure turbine 4.

Of the partial intermediate pressure turbine 4 there is a further selection of steam. To do this through the control valve 18 (valve KL) select install the first partial stream MD1for capacity feed water 20. Further selection occurs through established through control valve 22 (valve steam for technological needs PDKL) the second partial stream MD2as steam for technological needs. Further selection occurs through established through control valve 24 (valve KL) third partial stream MD3for line heating low pressure 26. Installed through control valve 28 (valve condensate for heating HKKL) first cha is for heating 30. Also installed a second partial quantity of exhaust steam MD5partial intermediate pressure turbine 4 down through the bypass valve 32 (UKL) to partial low pressure turbine 6.

Of the partial low-pressure turbine 6 is also a selection of steam for heating low-pressure 26 and condenser for heating 30. For this first partial flow of ND1directly, and the second partial stream of ND2through control valve 34 (valve KL) down to the line of heated low pressure 26. Similarly to the condenser for heating 30 down the third partial stream of ND3directly, and the fourth partial flow of ND4through control valve 36 (valve condensate for heating HKKL). Spent steam ND5of the partial low-pressure turbine 6 is condensed in the condenser 38.

The main condensate To drain from the space 40 of the capacitor 38 through the condensate pump 42 through line heating low pressure 26 serves in the capacity of the feed water 20. From the tank feed water 20 through the feedwater pump 44 feed water S served through the line of heated high-pressure 14. Auxiliary condensate NK1ispytatelnoy water 20. Similarly, the auxiliary condensate NK2from the heated low-pressure 26 served by auxiliary condensate pump 48 to the condenser 38, that is, his discharge space 40. In addition, the auxiliary condensate NK3from the condenser for heating 30 served by the auxiliary condensate pump 50 in the discharge space 40 of the capacitor 38.

While the flow of the main condensate and feedwater S produced by regulating the levels of LK/LSBWfeeding auxiliary condensate NK1,2,3set through a separate level control NKR1, NKR2or, respectively, NKR3. The last can be fed total setpoint position YNKR.

Device for fast power control is shown in Fig. 2. It contains a regulating device 60 with five regulatory modules 62, 64, 66, 68 and 70. The regulating device 60 receives as input values a and b request power PSand the actual value of capacity or excess capacity1. The actual value of the excess power P1measured by the measuring device 72 on the generator 8 (Fig. 1).values of PWLthat divert not represented in more detail by way of the regulation of the steam generator power block. Further, the regulating device 60 receives as input values d - h information about the operational status of the power block. They are as the input variable d heating power PFWas the input variable e is the number of extracted steam for technological needs or mass flow of steam for technological needs MPDas the input values of f, the degree of throttling DFDregulating valve in the fresh pair of 10, as the input value of g possible load KL of the power unit and an input variable h technological readiness TB available energy storage. Further work values P can be fed to the regulating device 60 via the input i.

Inputs a - i belong to the first regulating module 62 of the regulating device 60. They take into account applied for subject to regulation section of the process parameters of the process PSPIPFW, MPDDFD, KL, TB and P.-based algorithm, based on the technological knowledge of the potential reserve capacity separate Meritage determine actual working condition, characterized by the power generator PSand heat capacity of PFWand the mass flow of steam for technological needs MPDand the degree of throttling DFD. For each actual operating state, determine the optimal combination of events L1...nto cover instantly required reserve capacity. Thus take into account limitations due to possible power KL and technological readiness TB individual activities Ln. In conclusion, for the set of actions Lncalculate the share of power PSRM(1...n)and as the output variable 1 form an enable signal for the participating events Ln. In addition, as a further output value k determines the additional heat capacity of PWLfor (non -) regulation of the steam generator.

The output values of j and 1, as well as cogeneration thermal power PWLform input quantity regulating module 64. In the control module 64 as output values m - r formed the specified position values YFD, YUKL, YPDKLand YKLregulating valve fresh pair 10, for perepusku 12, 18, 24 and 34. The calculated setpoints position Y correct through associated with control module 64 regulatory module 66 to which the input values of the sum specified power value PSand the real value of the excess power PI.

In the control module 68 as output values s and t, depending on the event Lnthe provisions of valves or control valves 10, 12, 18, 22, 24, 28, 30, 32, 34 and/or 36, and their rate of change of position form a proof for a given position YKP, YNKPregulation of condensate or, respectively, the auxiliary condensate NKR1,2,3. To do this, to the control module 63 fail as input values output values of j and r regulatory module 62 or 64, that is, the setpoint position YKLand the combination of events L1...n.

Regulating module 70 includes algorithms for determining the required degree of throttling to control valve fresh pair 10. To do this regulatory module 70 fail as an input value output value j and further describing the current operating status of the energy is Apana fresh pair 10 is compared with a pre-selected degree of throttling u give as output values and automatically consistent degree of throttling DFD.

The throttling control valve or the Executive body fresh pair 10, which sets the mass flow of steam, supplied to the partial high pressure turbine 2, restores thereby adjustable controllable energy storage device that can be charged up running after a certain preset position value YFDand through the degree of throttling DFDor discharged under control for providing backup power. To enable further energy storage partial flows pair selection or spent steam FD1,2MD1...5ND1...5and supplying the condensate To or auxiliary condensate NK separately or together, as well as partially or completely can grossulariata by the respective Executive bodies (control valves, pumps) 12, 18, 22, 24, 28, 32, 34, 36, 42, 46, 48, 50. Thereby partially reduces or stops the power to the heating lines 14, 26. The control is, of course, through the regulating device 60 on the basis of the respective set values of the position y

The underlying regulating device 60 Association of technological knowledge is ω can have a special influence on the choice of activities guarantees as economically the best use of available energy storage and care of the process and power plants.

1. Method for fast power control power plant with turbine unit containing steam turbine and generator, in which excess power of the generator during operation of the installation, activate the available energy storage, and advanced power generator (RSP1attract at least one further characterizing the actual operating state of the process parameter (PSP1PWLPFW, MPDDFD, KL, TV, P) to determine the set of specified values of the position (Y, DFD), characterized in that the first further process parameter (PSP1PWLPFW, MPDDFD, KL, TV, P) for determining the set values of the position (Y, DFDattract allocated from the operation of the heat capacity (PFW).

2. The method according to p. 1, characterized in that as an additional parameter of the process used, the degree of throttling (DFDat least one associated with parodontologie further process parameter draw is taken from the operation of the installation mass steam flow (MPD).

4. The method according to any of paragraphs.1 to 3, characterized in that as an additional further process parameter attract the actual value of heat capacity (PWLprocess plant operations.

5. The method according to any of paragraphs.1 to 4, characterized in that for determining the set values of the position (Y) take into account information about the activation capacity (TV) energy storage.

6. Device for rapid regulatory capacity of the power plant with turbine unit containing steam turbine (2, 4, 6) and the generator, and means for activating existing during operation of the installation of energy storage for excess power of the generator, which contains a regulating device (60), inputs (i) which contain values of power (PSP1generator (8) and at least one further process parameter (PSP1PWLPFW, MPDDFD, KL, TV, P), and outputs (n - u) denote the set position value (Y) for a multitude of connected with a steam turbine (2, 4, 6) Executive bodies(10, 12, 18, 22, 24, 28, 32, 34, 36, 42, 46, 48, 50), characterized in that on one of the inputs (a - i) filed derived from process to operate the e device (60) includes a first regulating module (62), the inputs of which (i) contain the parameters of the process (PSP1PWLPFW, MPDDFD, KL, TV, P) and output (j) which indicates the proportional values of combinations of events (Ln) for making available spare capacity.

8. The device according to p. 7, characterized in that there is a second regulatory module (64), an input connected to the output (j) of the first regulating module (62) and outputs (n - r) which indicate the specified position value (Y) for the Executive bodies of the pair(10, 12, 18, 24, 28, 32, 34, 36).

9. The device under item 8, characterized in that there is connected on the output side with the second regulatory module (64) the third regulating module (66), to the inputs (a, b) which summed power value (PSP1generator (8).

10. The device under item 8 or 9, characterized in that there is a fourth regulating module (68), the inputs of which are connected to at least one output (r) of the second regulatory module (64) and output (j) of the first regulating module (62), o (s, t) which indicate the set values of the position (YKP, YNKRfor the Executive bodies of the condensate(42, 46, 48, 50).

11. Device according to any one of paragraphs.6 - 10, otlichayas is D at least one Executive body (10).

 

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