Due to system failures and the limited overcurrent capability of semiconductor devices, in modular multilevel converters (MMC) is a key factor affecting safe stable operation offshore wind power MMC-HVDC (modular converter high-voltage direct current) transmission systems. This paper proposes field-circuit coupling analysis method for research MMC valve. The integrates electric field characteristics valves with Firstly, development process influencing factors systems are analyzed. A model an...

Due to system failures and the limited overcurrent capability of semiconductor devices, in modular multilevel converters (MMC) is a key factor affecting safe stable operation offshore wind power MMC-HVDC (modular converter high-voltage direct current) transmission systems. This paper proposes field–circuit coupling analysis method for research MMC valve. The integrates electric field characteristics valves with Firstly, development process influencing factors systems are analyzed. A model an...

Due to the highly demanding operating conditions of Modular Multilevel Converter (MMC), as well its inherently complex structure, electric field analysis MMC valve is crucial for safe and stable operation MMC-HVDC (MMC high voltage direct current) transmission systems. In this paper, a high-speed modeling method based on data derivation proposed. Firstly, relationship between calculation model parameters system was studied. Based this, all components established. Modeling database empirical...

In this paper, we propose to monitor the thermal parameters of insulated gate bipolar transistor (IGBT) module using case temperature. This method works during shutoff period IGBT where temperature is in cooling phase By establishing relationship between Cauer-type RC and time constants curves, can be identified. The proposed able eliminate influence interface material (TIM) degradation on monitored results, which quite challenging for current monitoring methods. Moreover, it enables...

This paper proposes a thermal network parameter estimation method for insulated-gate bipolar transistor (IGBT) modules using the junction temperature cooling curve. The proposed finds RC parameters of fourth-order Cauer by establishing relationship between and time constants response curves. Experimental tests are performed to validate accuracy developed method. Results show that difference total resistance IEC standard is below 2%. Advantages over existing methods does not need 1) know...

In this paper, we propose a method to monitor the thermal parameters of insulated gate bipolar transistor (IGBT) module using junction temperature cooling curves. Relationship between time constants curves and Cauer model is established for condition monitoring. Advantages proposed approach include no need measure power loss heat equilibrium. Simulation experimental tests are performed verify accuracy effectiveness method. Results show that can not only parameter single layer, but also...

Insulated gate bipolar transistor (IGBT) module is one of the most prone-to-fail components in wind power converter (WPC). The reduction junction temperature swing by thermal management can improve reliability a WPC. Due to lack an applicable selection criterion, not many studies on control target were reported. This article proposes strategy find swing. proposed considers return investment (ROI) as quantitative indicator guide selection. selected enables optimal benefit management. Results...

The thermal network parameters of IGBT module are wildly used for reliability evaluation, lifetime calculation, health monitoring, and predictive maintenance. Commonly parameter identification methods include the finite element method (FEM) curve fitting impedance (Zth) method. former calculates directly using geometric structure material properties, but it is difficult to consider aging procedure IGBT. mainly depends on constant loss constraints, which guarantee in practical application. In...

SiC-based wide bandgap semiconductor devices such as metal-oxide-semiconductor field-effect transistors (MOSFETs) are gradually replacing Si in industrial applications because of their excellent electrothermal properties. However, the reliability these and problem junction temperature estimation concerns that yet to be resolved for applications. This article proposes a method measure Cauer-type RC thermal network parameters consider influence degradation external cooling system using either...

The cooling system, including the thermal grease, heatsinks, plays an important role in power converters for its reliable operation. While long-term operation situation, system will degrade with different kinds of failure mechanism components and finally result damage to converters. In this paper, method was proposed monitor network parameters using curves junction temperature. By establishing relationship between RC Cauer time constants curves, about can be obtained. Experimental tests are...

This paper proposes a new method that uses the time constant of heat sink temperature cooling curve as an indicator to monitor solder fatigue insulated gate bipolar transistor (IGBT) module well deterioration system. approach is based on direct correspondence between certain and thermal parameters given part cascaded The aging IGBT system can be monitored by detecting variations corresponding constants. Experimental tests were conducted demonstrate effectiveness accuracy this technique.

Recently wind energy has developed at a fast pace, and it is necessary to develop equivalent models represent dynamic behaviors of farms on power system. The method been investigated for the aggregation DFIG turbines. detailed procedure calculation analyzed. necessity classifying incoming winds shown. In order improve performance method, this paper proposes classify according mean speeds variances speeds, group turbines with similar are aggregated together. Simulations in practical system...

In this paper, we propose a new method to monitor the thermal path degradation of IGBT module using time constants junction temperature cooling curve. The correlation between and Cauer-type parameters is investigated. Results show that can be monitored by detecting variation constants. Simulation experimental tests are performed verify effectiveness proposed method.

Abstract The accurate positioning of the voltage sag disturbance source relative to monitoring point helps clarify responsibilities both parties. This paper proposes a brand-new single-frequency cross S-transform perturbation power method for locating sources. First, and current signals collected at are transformed into single fundamental frequency S obtain complex vector current; then, is subjected transformation. module extracts instantaneous apparent power, then obtains power; finally,...

Thermal grease gets generally application in power device, for its high-efficient thermal conducting performance. While the long-term operating situation, will degrade with pump-out and dry-out phenomenon do harm to heat dissipation of devices, so it is necessary monitor states grease. In this paper, we propose a method resistance using cooling curves junction temperature. By establishing relationship between RC parameters Cauer network time constants curves, about can be obtained....

Correct calculation of sediment carrying capacity in natural rivers is great significance to the simulation movement and river-bed deformation by mathematical model. Peak recognition support vector machines, an improved was proposed considering complication nonlinearity between its impact factors; peak least square machines prediction model, which based on chaos optimization, built combining with accelerating optimization against questions regression such as parameter training test speed....

Parallel operation of IGBT module is an attractive solution to achieve high power capacity converters due the physically limited current rating available modules. Due stable parallel-connected modules, thermal coupling effects among modules exist. However, resistance monitoring under electro-thermal condition considering effect are still not specific fully investigated, which may lack confidence in results. This paper presents a study for determination condition. The experimental results...

For the inductosyn angle measuring system axial digital converter integral loop and VCO linear range restricted problem of tracking speed control voltage, measurement has been developed, based on time subdivision method. The mainly consists rotary table, excitation power, signal pick-up circuit, FPGA module, display serial communications modules host computer. is used as core in system, high-speed processing satisfied requirements. Induction subdivided by high-frequency clock pulse. Angle...