Systems and methods for improved transient response of turbine generators

Abstract

To provide systems and methods for improved transient response of turbine generators.SOLUTION: A system includes a control system. The control system includes a memory that stores a mechanical power system stabilizer (MPSS) system configured to dynamically stabilize an operation of a generator system by adjusting a gas turbine system, where the generator system is mechanically coupled to the gas turbine system. The control system includes a processor connected to the memory and configured to execute the MPSS so that the MPSS detects a transient event caused by a power grid that is electrically coupled to the generator system. The MPSS also mechanically deloads the gas turbine system, waits until a clearing time has elapsed, and mechanically loads the gas turbine system.SELECTED DRAWING: Figure 1

Description

[Background technology]

[0001] The present disclosure relates to turbine systems and, more particularly, to improving the transient response of turbogenerators.

[0002] Some power generation systems include electrical generators and distributed generators that may be driven by a turbine system, such as a gas turbine system. The gas turbine system may provide power suitable for rotating a generator to generate electrical power, for example. The turbine system and the generator system include one or more controllers suitable for providing various control functions, such as control of gas turbine speed, load, generator voltage, reactive power flow, and stability of the overall power generation system. During operation, the power generation system is electrically coupled to an electrical power system, such as a city or regional electrical power system. However, under certain operating conditions of the electrical power system, transient conditions may occur. It would be beneficial to improve the handling of the transient conditions. Summary of the Invention

[0003] The following summarizes certain embodiments of the invention as originally claimed. These embodiments are not intended to limit the scope of the claimed invention, but rather to provide a simplified summary of possible forms of the invention. Indeed, the invention encompasses a variety of embodiments that are similar to, but different from, the embodiments set forth below.

[0004] The system includes a control system including a memory storing a mechanical power system stabilizer (MPSS) system configured to dynamically stabilize operation of a generator system by regulating a gas turbine system, the generator system being mechanically coupled to the gas turbine system. The control system includes a processor coupled to the memory and configured to execute the MPSS system such that the MPSS system detects a transient event due to a power system electrically coupled to the generator system. The MPSS system further mechanically deloads the gas turbine system, waits for a resolution time to elapse, and mechanically loads the gas turbine system.

[0005] A non-transitory computer-readable medium has computer-executable code stored thereon, the code including instructions for executing a Mechanical Power System Stabilizer (MPSS) system configured to dynamically stabilize operation of a generator system by regulating a gas turbine system, the generator system being mechanically coupled to the gas turbine system. The MPSS system detects a transient event due to a power system electrically coupled to the generator system. The MPSS system further mechanically unloads the gas turbine system, waits until a resolution time has elapsed, and mechanically loads the gas turbine system.

[0006] The system includes a gas turbine system configured to convert fuel into rotational power, and a generator system mechanically coupled to the gas turbine system and configured to generate electrical power based on the rotational power. The system further includes a gas turbine controller configured to detect a transient event due to an electrical utility grid electrically coupled to the generator system and to mechanically unload the gas turbine system. The gas turbine controller is further configured to wait until a resolution time has elapsed and to mechanically load the gas turbine system. [Brief description of the drawings]

[0007] These and other features, aspects and advantages of the present invention will become better understood by reference to the following detailed description taken in conjunction with the accompanying drawings. [Figure 1] 1 is a block diagram of an embodiment of a power generation system having a gas turbine system mechanically coupled to a generator system. [Diagram 2] 2 is a schematic diagram of an embodiment of a control system included in the system of FIG. 1 including a mechanical power system stabilizer (MPSS) according to one embodiment. [Diagram 3] 3 is a graph showing load angle oscillation of the power generation system of FIG. 2 according to one embodiment. [Figure 4] 3 is a flow chart illustrating an embodiment of a process suitable for application in the MPSS system of FIG. 2 according to one embodiment. [Diagram 5] 3 is a flow chart illustrating further details of a process suitable for application of the MPSS system of FIG. 2 according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] One or more specific embodiments of the present invention are described below. In order to provide a concise description of these embodiments, not all features of an actual implementation may be described herein. It will be apparent that the development of an implementation, as with any engineering or design project, will require many implementation-specific decisions to be made to achieve the developer's particular goals (e.g., complying with system and business related constraints), which may vary from implementation to implementation. Moreover, such a development effort may be complex and time-consuming, but will be apparent to those skilled in the art having access to the disclosure herein, by way of routine design, fabrication and manufacture.

[0009] When introducing elements of various embodiments of the invention, the singular articles "a," "an," and "they" mean that there are one or more of the elements. The terms "comprising," "including," and "having" are inclusive and mean that there may be additional elements other than the listed elements.

[0010] The present embodiment relates to a system and method for dynamic mechanical control of generator load angle oscillation damping that may occur, for example, during a power system transient. In particular, a mechanical power system stabilizer (MPSS) system is provided to continuously and adaptively determine whether to apply specific mechanical control to a gas turbine system during a transient that may be experienced by the power system. For example, a three-phase short circuit may occur in the power system, resulting in a transient. Similarly, electricity generation from renewable energy sources (wind, solar, etc.) may affect the power system frequency changes (e.g., transient events) resulting in loss of inertia in the power generation system. Thus, when the source of the transient causes a specific transient change (e.g., above or below a threshold), the synchronous inertia may decrease, resulting in an increased rate of change in frequency conditions.

[0011] In some cases, a transient event (transient condition) exceeding one or more parameters (e.g., a threshold value, such as a certain amount of frequency change and / or a certain amount of frequency change in a given time period) may activate the MPSS system to actively dampen certain types of transient events (e.g., initial upset transients) by mechanically controlling the gas turbine system (e.g., controlling the rotation of the gas turbine to control the rotation of a generator mechanically coupled to the gas turbine). By mechanically controlling the power generation system, the MPSS system may reduce voltage instability / overshoot / undershoot at the generator terminals and prevent trip levels that could have caused adverse issues to the power system and / or grid voltage.

[0012] Thus, a power generation system including an MPSS system may be operable to dynamically detect a transient event quickly (e.g., in less than 50 ms), determine whether the transient event exceeds one or more thresholds, and mechanically provide an appropriate transient response (e.g., for 1, 5, 10, 15 seconds or more until the transient event has passed) to clear the transient condition, thereby enhancing voltage stability of the power system to which it is connected. Thus, an MPSS system operating with the dynamic capability to perform specific control actions to mechanically adjust the gas turbine (and connected generator) based on a detected transient event enhances voltage stability of the power system to which it is connected, for example, by bringing the generator terminal voltage closer to its nominal operating value. Thus, voltage instability / overshoot or undershoot at the generator terminals of the power system may be avoided, for example, to avoid tripping of the gas turbine (and associated problems) due to sudden transient conditions.

[0013] As used herein, the term "mechanical power system stability" refers to at least the ability of the power systems and associated components (e.g., power systems, generators, turbines, etc.) described herein to transition from, for example, a steady-state operating point (e.g., a nominal operating point) to, for example, one or more other mechanical operating points (e.g., valve settings, throttle settings, guide vane settings, pump settings) following a perturbation, disturbance, or other undesirable effect on the power system.

[0014] With the above in mind, it may be useful to describe an embodiment of a power generation system, such as the exemplary power generation system 10 shown in FIG. 1. The power generation system 10 includes various subsystems, such as a turbine 12, a generator 14, and an exciter 16. The turbine 12 (e.g., a gas turbine, a steam turbine, a hydro turbine, etc.) may be coupled to the generator 14 via a shaft 13. In some embodiments, the gas turbine 12 is an aeroderivative gas turbine, which is lighter and has a smaller inertial mass than non-aeronautical gas turbines. The generator 14 may be communicatively coupled to a generator exciter 16. The exciter 16 may provide direct current (DC) to a field winding 22 of the generator 14. In particular, the exciter 16 may provide a DC field current (e.g., a current utilized by the field winding 22 of the generator 14 and / or other synchronous machines to establish a magnetic field for operation) to excite the magnetic field of the generator 14. For example, the exciter 16 may be a static (e.g., power electronic) or rotary (e.g., brush and / or brushless) type exciter. In other embodiments, the exciter 16 may be bypassed and the power output may be energized directly to a field winding 22 of the generator 14. As also shown, the output terminals of the generator 14 may be coupled to a larger utility power system 26 via alternating current (AC) lines 28. Alternatively, the output terminals of the generator 14 may be coupled to a smaller industrial power plant.

[0015] The power generation system 10 may include an excitation system 24 that may provide various control parameters to each of the generator 14 and / or exciter 16 based, for example, on measured parameters and / or indications of measured parameters received at one or more inputs to the excitation system 24. In some embodiments, the excitation system 24 may function as an excitation control for the generator 14 and the exciter 16. The excitation system 24 may also function as an automatic voltage regulator (AVR) to automatically maintain the output terminal voltage of the generator 14 at a set value under varying load and operating temperature conditions. The excitation system 24 may include one or more controllers 32 and one or more power converters 34. The power converters 34 may include a subsystem of integrated power electronic switching devices, such as silicon controlled rectifiers (SCRs), thyristors, insulated gate bipolar transistors (IGBTs), etc., that receive alternating current (AC) power, direct current power, or a combination thereof, from a source, such as the utility grid 26. The excitation system 24 may receive this power via a bus 29 and may provide power, control and monitoring based thereon to a field winding 30 of the exciter 16. Thus, the excitation system 24 and the exciter 16 may collectively operate to drive the generator 14 in accordance with a desired output (e.g., grid voltage, power factor, load frequency, torque, speed, acceleration, etc.). By way of example, in one embodiment, the excitation system 24 may be an excitation control system such as an EX2100e® regulator available from General Electric Corporation (Schenectady, NY, USA).

[0016] In certain embodiments, the power system 26, the turbine 12, and the generator 14 are susceptible to certain disturbances, such as, for example, a transient loss of power generation by the generator 14, a switching of the power line 28, a load change on the power system 26, an electrical fault on the power system 26, etc. Such disturbances may cause the operating frequency of the turbine 12 and / or the generator 14 (e.g., about 50 Hz in most European and Asian countries, and about 60 Hz in North American countries) to undergo undesirable oscillations that may result in transient and / or dynamic instability of the system 10. Such transient and / or dynamic instability may cause the generator 14, as well as the turbine 12 and the exciter 16, to move from a steady-state operating point to a transient and / or dynamic operating point. Specifically, frequency deviations on the power system 26 may cause rotor angle oscillations (e.g., load angle oscillations) of the generator 14 throughout the power system 10. Furthermore, unlike the mechanical power system stabilizer (MPSS) technology described herein, conventional power system stabilizer (CPSS) systems (e.g., systems used to damp rotor angular oscillations of the generator 14) may be configured according to generally linear constant parameters, and therefore the CPSS system mechanically alters the behavior of the turbine system 12 to handle transient events and prevent continuous operation of the power generation system 10 without tripping.

[0017] As described in more detail below, in certain embodiments, the controller 32 may include a mechanical power system stabilizer (MPSS) system 40 (shown in FIG. 2 ) that may be implemented to dynamically and adaptively tune the gas turbine system 12, such as to dynamically and adaptively regulate power frequency oscillations of the rotor of the generator 14. The MPSS may enhance the ability of the system 10 to continue operating through transient conditions without tripping.

[0018] Turning now to Figure 2, Figure 2 illustrates a detailed block diagram of an embodiment of a controller 32 included in power generation system 10 (shown in Figure 1). As illustrated generally in the figure, controller 32 may include one or more processors 36 and memory 38, which may collectively be used to support operating systems, software applications, systems, and the like useful for implementing the techniques described herein. In particular, controller 32 may include code or instructions stored in a non-transitory machine-readable medium (e.g., memory 38 and / or other storage) for execution by one or more processors 36 included in controller 32, for example. The processor 36 receives various generator 14 operating state parameters (e.g., terminal voltage, real power (P), reactive power (Q), power factor, frequency, etc.) and / or turbine system 12 operating parameters (e.g., turbine speed, load (e.g., in megawatts), combustion temperature, pressure, clearances (e.g., between rotating and stationary components), fuel flow (e.g., flow of fuel and / or oxidizer such as air), valve positions, etc.) which may be used to control the operating parameters by the MPSS system 40 (e.g., via one or more processors 36), such as to control a throttle valve 42, inlet guide vanes 44, blowout valve 46, and other actuators 48 of the turbine system 12.

[0019] 1, under certain load conditions (e.g., due to changes in load demand on the power system 26), the turbine 12, generator 14, and other components included in the power generation system 10 are susceptible to transient and dynamic instabilities. In particular, transient conditions on the power system 26 may result in rotor swings (e.g., vibrations) and other transient-related problems in the generator 14. As such, the MPSS system 40 (e.g., executed via one or more processors 36) may be used to provide mechanical regulation through the control of the operation of the turbine system 12.

[0020] In some embodiments, the MPSS system 40 may be a software system or, in other embodiments, a combination of software and hardware that may be used to effect appropriate operating parameters of the turbine system 12 based on, for example, real power (P) (e.g., MW), reactive power (Q) (e.g., kVar), power factor, frequency, terminal voltage, turbine speed, turbine load, turbine pressure (compressor pressure, exhaust pressure, etc.), liquid flow (flow of air as oxidant, diesel, syngas, gasoline, methane gas, hydrocarbon fuel, etc.), etc. The MPSS system 40 thus enables the power system 10 to make appropriate mechanical adjustments for transient operation.

[0021] 3 shows a graph 100 with an X-axis 102 showing time progression and a Y-axis 104 showing the rotor angle in degrees of the generator 14. During a transient event, the generator 14 may experience a loss of synchronicity. For example, as the rotor angle changes, the output frequency changes. The illustrated embodiment shows the rotor angle having a peak at location 106. This first peak is included in the example of the first transient perturbation (e.g., swing-up).

[0022] In some cases, the first transient disturbance may result in a trip; that is, a change in rotor angle and / or associated problems may cause a system, such as the excitation system 24 and / or the controller 32, to initiate a shutdown of the power system 10 and the systems contained therein. The techniques described herein may quickly detect the first transient disturbance 126. For example, the excitation system 24 may be an excitation control system, such as an EX2100e® regulator available from General Electric Co., Schenectady, NY, that includes transient detection logic capable of detecting a first transient amplitude in 50 milliseconds (ms) or less. The techniques described herein may use fast transient detection to mechanically adjust the power generation system 10 or specific systems of the power generation system 10 (e.g., the gas turbine system 12) to minimize or prevent loss of synchronism.

[0023] 4 is a flow chart of an embodiment of a process 150 suitable for mechanical tuning of the gas turbine system 12, for example, during a transient condition in the power system 26. The process 150 may be stored as computer instructions in the memory 38 and executed by the processor 36. In the illustrated embodiment, the process 150 may detect a transient event (block 152). For example, the excitation system 34 may include one or more sensors, such as a voltage sensor, a current sensor, an inductance sensor, a capacitance sensor, etc., that detect the initial transient amplitude shown in FIG. 3. In some cases, the detection takes less than 50 milliseconds, for example, averaging 30-40 milliseconds.

[0024] The process 150 may then mechanically unload (block 154) the gas turbine system 12. For example, the process 150 may adjust the throttle valve 42 to reduce the fuel intake to the gas turbine 12. Other adjustments may include adjusting the inlet guide vanes 44 or similar compressor section vanes, blowout valves 46, and / or other actuators 48 (e.g., pumps, solenoids, switches) to rapidly reduce the power generation by the gas turbine 12. In some cases, the power generation may drop to between 150 MW per second and 250 MW per second.

[0025] In some embodiments, if the controller 32 is a Mark series controller available from General Electric Company (Schenectady, NY), then "Zonker" logic may be used as part of the unloading of the gas turbine system 12. Other controllers may use similar trip logic. For example, Zonker logic may be used to trip the gas turbine system 12 during gas turbine operation. However, the process 150 may use Zonker logic (or other trip logic) without tripping or shutting down the gas turbine system 12. For example, the fuel throttle valve 42 may be set to a minimum operating value (per manufacturer's recommendations), a fast vent empties the fuel in the manifold via the actuator 48, and a high pressure bleed and / or frozen compressor guide vanes may increase the compressor load in the compressor section of the gas turbine system 12 to reduce shaft power without causing a "flameout" or other cessation of fuel combustion in the gas turbine system 12. Thus, the gas turbine system 12 may be rapidly unloaded (block 154) (eg, 150 MW to 250 MW or more per second) without misfire.

[0026] The unloaded gas turbine system 12 may continue to operate during the transient, and the transient is then resolved (block 156). In some embodiments, the transient may be resolved in accordance with regulations. That is, certain regulatory rules may dictate that the power generation system 10 continue to operate for a predetermined period of time (e.g., 1-30 seconds) during a transient due to, for example, a three-phase short circuit in the power grid 26. It is noted that the power generation system 10 may be one of many power generation systems in a power plant. For example, one, two, three, four, five, or more power generation systems 10 may be electrically coupled to the power grid 26 and used to provide power to the power grid 26.

[0027] Once the transient event is resolved, the process 150 may then mechanically load the gas turbine system 12 (block 158). For example, the process 150 may reverse the unloading (block 154) by opening one or more throttle valves 42, adding oxidizer via the vanes 44, closing one or more blowout valves 46, and / or manipulating the actuators 48 to increase power to the gas turbine system 12 to increase power generation of the power generation system 10. Thus, the techniques described herein may provide mechanical adjustments suitable for resolving a particular transient condition.

[0028] 5 is a flow chart of further details of process 150 illustrating a process 200 that may be used to unload and reload the gas turbine system 10. Process 200 may be stored as computer instructions in memory 38 and executed by processor 36. In the illustrated embodiment, process 200 may begin by setting a mechanical power reference value (P_ref) (block 202). For example, P_ref may be set to 1.0 per unit. Once a transient event (e.g., an initial transient upset) is detected, a detection wait time T D (Block 204) may occur. D may be between 20-50 ms, or an average of about 30-40 ms. Next, the process 200 may ramp down the power generation of the gas turbine system 12 (block 206).

[0029] In some embodiments, a ramp-down rate may be used, such as a ramp-down rate of -5.0 per unit. As described above, the ramp-down block (206) may include setting the fuel throttle valve 42 to a minimum operating value (per manufacturer's recommendations), emptying the fuel in the manifold via a high speed vent using the actuator 48, and using a high pressure bleed and / or compressor guide vane freeze to increase the compressor load in the compressor section of the gas turbine system 12 to reduce shaft power without causing a "misfire" or other cessation of fuel combustion in the gas turbine system 12. Thus, the gas turbine system 12 may be ramped down (block 206).

[0030] Therefore, the mechanical power (P mech ) 208. When the fault condition is cleared, the final mechanical power (P final )210. final may represent the power when the gas turbine system is ready to load or ramp up. The process 200 may then ramp up the gas turbine system (block 212). For example, a ramp-up rate of 5.0 per unit may be used to ramp up the gas turbine system 12. The process may then return to block 202. By quickly unloading the gas turbine system 12 during a transient (e.g., an initial upset transient), the techniques described herein facilitate continued operation of the power generation system 10 in compliance with regulations during certain power system undesirable events (e.g., a three-phase short circuit).

[0031] A technical effect of an embodiment of the disclosed technology includes a power generation system having a gas turbine system connected to a generator. The generator supplies power to a power grid. When a transient occurs due to certain grid conditions, a controller may unload the gas turbine to address the transient and reload the gas turbine after the transient ends. Thus, mechanical tuning may provide mechanical power derating while improving synchronicity maintenance.

[0032] Additional aspects of the disclosed technology are set forth in the following embodiments section. [Embodiment 1] The system includes a control system including a memory storing a mechanical power system stabilizer (MPSS) system configured to dynamically stabilize operation of a generator system by regulating a gas turbine system, the generator system being mechanically coupled to the gas turbine system. The control system includes a processor coupled to the memory and configured to execute the MPSS system such that the MPSS system detects a transient event due to a power system electrically coupled to the generator system. The MPSS system further mechanically unloads the gas turbine system, waits until a resolution time has elapsed, and mechanically loads the gas turbine system. [Embodiment 2] The system of embodiment 1, wherein the processor is configured to execute the MPSS to damp load angle oscillations of the power generation system by mechanical unloading of the gas turbine system. [Embodiment 3] The system of embodiment 1 or 2, wherein the processor is configured to detect a transient event using an excitation system electrically coupled to the generator system. [Embodiment 4] The system of any one of embodiments 1 to 3, wherein the excitation system is equipped with an automatic voltage regulator (AVR) that automatically maintains the output terminal voltage of the generator system at a set value under variations in load and operating temperature. [Embodiment 5] The system of any one of embodiment clauses 1 to 4, wherein the transient event includes an initial perturbation transient event representing an initial change in load angle of the power generation system. [Embodiment 6] The system of any one of embodiments 1 through 5, wherein the processor is configured to unload the gas turbine system by modulating a blowout valve. [Embodiment 7] The system of any one of embodiments 1 to 6, wherein the processor is configured to unload the gas turbine system using trip logic to rapidly reduce power generation of the gas turbine system. [Embodiment 8] The system of any one of embodiments 1 through 7, wherein the processor is configured to unload the gas turbine system while preventing misfire in the gas turbine system. [Embodiment 9] The system of any one of embodiments 1 to 8, wherein the resolution time includes a time set by a regulatory authority. [Embodiment 10] The system of any one of embodiments 1 through 9, wherein the gas turbine system includes an aeroderivative gas turbine. [Embodiment 11] A non-transitory computer-readable medium has computer-executable code stored thereon, the code including instructions for executing a Mechanical Power System Stabilizer (MPSS) system configured to dynamically stabilize operation of a generator system by regulating a gas turbine system, the generator system being mechanically coupled to the gas turbine system. The MPSS system detects a transient event due to a power system electrically coupled to the generator system. The MPSS system further mechanically unloads the gas turbine system, waits until a resolution time has elapsed, and mechanically loads the gas turbine system. [Embodiment 12] The non-transitory computer-readable medium of embodiment 11, wherein the MPSS system is configured to damp load angle oscillations of the generator system through mechanical unloading of the gas turbine system. [Embodiment 13] The non-transitory computer readable medium of embodiment 11 or embodiment 12, wherein the MPSS system is configured to detect a transient event using an excitation system electrically coupled to the generator system. [Embodiment 14] The non-transient computer readable medium of any one of embodiments 1 to 13, wherein the transient event includes an initial perturbation transient event representing an initial change in load angle of the power generation system. [Embodiment 15] The non-transitory computer readable medium of any one of embodiments 11 to 14, wherein the MPSS system is configured to unload the gas turbine system by modulating a blowout valve, using trip logic to rapidly reduce power output of the gas turbine system, or a combination thereof. [Embodiment 16] The system includes a gas turbine system configured to convert fuel into rotational power, and a generator system mechanically coupled to the gas turbine system and configured to generate electrical power based on the rotational power. The system further includes a gas turbine controller. The gas turbine controller is configured to detect a transient event due to an electrical utility grid electrically coupled to the generator system and to mechanically unload the gas turbine system. The gas turbine controller is further configured to wait until a resolution time has elapsed and to mechanically load the gas turbine system. [Embodiment 17] The system of embodiment 16, wherein the controller is configured to damp load angle oscillations of the generator system by mechanical unloading of the gas turbine system. [Embodiment 18] The system of embodiment 16 or embodiment 17, wherein the controller is configured to detect a transient event using an excitation system electrically coupled to the generator system. [Embodiment 19] The system of any one of embodiment clauses 16 to 18, wherein the transient event includes an initial perturbation transient event representing an initial change in load angle of the power generation system. [Embodiment 20] The system of any one of embodiments 16 to 19, wherein the controller is configured to unload the gas turbine system by modulating a blowout valve, using trip logic to rapidly reduce power generation of the gas turbine system, or a combination thereof.

[0033] The present specification has been described by way of examples to disclose the invention, including the best mode thereof, and to enable those skilled in the art to practice the invention, including making and using the apparatus or system and practicing the method. The patentable scope of the invention is defined by the claims, and may include other examples that are obvious to those skilled in the art. Such other examples are within the scope of the claims if they have elements that are not literally different from the claims, or have equivalent elements that are only insubstantial different from the claims.

[0034] The technology described in this specification and claims refers to and is applied to physical objects and practical embodiments that demonstrably improve the state of the art, and as such is not abstract, intangible, or purely theoretical. However, where a claim includes an element recited in any other manner, the interpretation of that element is not subject to 35 U.S.C. 112(f). Moreover, if any claim includes one or more elements recited as "means for [performing] [a function]" or "steps for [performing] [a function]," such elements are to be interpreted under 35 U.S.C. 112(f). [Explanation of symbols]

[0035] 10 Power generation is not considered 12 Turbine 13 Shaft 14. Generator 16 Exciter 22 Field winding 24 Excitation System 32 Controller 34 Power Converter 36 processors 38 Memory 40 MPSS System 42 Throttle valve 44 Inlet guide vane 46 Blowout valve 48 Actuator

Claims

1. A system comprising a control system, the control system comprising: a memory storing a mechanical power system stabilizer (MPSS) system configured to dynamically stabilize operation of a generator system by regulating a gas turbine system, the generator system being mechanically coupled to the gas turbine system; A processor communicatively coupled to the memory, the MPSS comprising: detecting a transient event caused by an electrical grid electrically coupled to the generator system; mechanically unloading the gas turbine system; waiting until a resolution time has elapsed; mechanically loading the gas turbine system; a processor configured to execute A system comprising:

2. The system of claim 1 , wherein the processor is configured to execute an MPSS that damps generator system output angular oscillations through mechanical unloading of the gas turbine system.

3. The system of claim 1 , wherein the processor is configured to detect the transient event using an excitation system electrically coupled to a generator system.

4. 10. The system of claim 1, wherein the excitation system is an automatic voltage regulator (AVR) that automatically maintains the generator system output terminal voltage at a set value under load and operating temperature variations.

5. The system of claim 1 , wherein the transient event comprises an initial perturbation transient event representing an initial change in load angle of the power generation system.

6. The system of claim 1 , wherein the processor is configured to unload the gas turbine system by modulating a blowout valve.

7. The system of claim 6 , wherein the processor is configured to unload the gas turbine system using trip logic to rapidly reduce power generation of the gas turbine system.

8. The system of claim 1 , wherein the processor is configured to unload the gas turbine system while preventing a misfire in the gas turbine system.

9. The system of claim 1 , wherein the time to resolution comprises a time set by a regulatory agency.

10. The system of claim 1 , wherein the gas turbine system comprises an aeroderivative gas turbine.

11. 1. A system comprising: a gas turbine system configured to convert a fuel into rotational power; a generator system mechanically coupled to the gas turbine system and configured to generate electrical power based on the rotational power; 1. A gas turbine controller comprising: Detecting a transient event caused by an electrical power system electrically coupled to the generator system; mechanically unloading the gas turbine system; Wait until the resolution time has elapsed, and Mechanically loading the gas turbine system A custom controller configured as follows: A system comprising:

12. The system of claim 11 , wherein the controller is configured to damp load angle oscillations of the power generation system through mechanical unloading of the gas turbine system.

13. The system of claim 11 , wherein the controller is configured to detect a transient event using an excitation system electrically coupled to the generator system.

14. The system of claim 11 , wherein the transient event includes an initial perturbation transient event representing an initial change in load angle of the power generation system.

15. 12. The system of claim 11, wherein the controller is configured to unload the gas turbine system by modulating a blowout valve, using trip logic to rapidly reduce power generation of the gas turbine system, or a combination thereof.

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