In the state of the SM failure, the capacitor of the semi-hot standby SM needs to be recharged to the rated value to replace the faulty SM and the capacitor of the cold standby needs to be charged to replace the used semi-hot standby SM.
In the normal working state, the control signals of SMs need to comprehensively consider the influence of SM capacitor voltage balance, system DC side voltage, system AC output voltage, and system circulating current. When the SM fails, the faulty SM needs to be bypassed from the main circuit.
Only the semi-hot standby SM inserts the MMC system, so the troubleshooting is faster and the impact on the system is also smaller. Compared with the semi-hot standby control strategy, half of the redundant SMs are in cold standby mode, so the loss of redundant SM is lower.
Compared with the semi-hot standby control strategy, half of the redundant SMs are in cold standby mode, so the loss of redundant SM is lower. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Compared with cold standby SM, the insertion time of the hybrid control strategy is shorter. The shorter the insertion time, the better the stability of the system. There are 10% to 20% of redundant SMs in the MMC-HVDC system. If the hybrid control strategy is adopted, the loss of redundant SMs will be reduced a lot. 5. Conclusion
The results prove the feasibility of this strategy. Compared with the cold standby control strategy, the hybrid control strategy of SM is easier to implement and does not need an external power supply. Only the semi-hot standby SM inserts the MMC system, so the troubleshooting is faster and the impact on the system is also smaller.
fault by indirectly reserving a capacitor pre-charged H-bridge module. The main contributions and advantages of the proposed quasi-hot standby fault-tolerant control strategy compared to the …
Fig. 2 shows the capacitor voltage of the SMs under the normal working condition. In the normal working state, the general SMs and semi-hot standby SMs are in an …
Based on the traditional strategy, this paper proposed a quasi-hot standby fault-tolerant control strategy. The redundant H-bridge module is charged in advance to reduce the …
The main purpose of the capacitors is to keep the voltage from changing during changes in the load or supply conditions. If you start drawing twice as much load …
In general, there are three types in standby, i.e., cold, hot, and warm standby. Cold standby implies that the inactive component has a zero failure rate and cannot fail while …
• Healthcare: DEIF offers state of the art critical power management solutions, in line with global standards, that demands restoration of emergency power supplies in less than …
Based on the traditional strategy, this paper proposed a quasi-hot standby fault-tolerant control strategy. The redundant H-bridge module is charged in advance to reduce the impact of fault on CHBR. So the charging time t 2c of …
The answer is yes, capacitors can get hot during operation, particularly when subjected to high currents, high frequencies, or excessive voltage stress. Heat generation in capacitors can occur due to factors such as …
In the normal working state, the capacitor voltages of the semi-hot standby SMs need to be controlled within a certain range. In the state of the SM failure, the capacitor of the …
In general, there are three types in standby, i.e., cold, hot, and warm standby. Cold standby implies that the inactive component has a zero failure rate and cannot fail while …
In the normal working state, the capacitor voltages of the semi-hot standby SMs need to be controlled within a certain range. In the state of the SM failure, the capacitor of the …
Switched-Capacitor-Assisted Power Gating for Ultra-Low Standby Power in CMOS Digital ICs August 2020 Circuits and Systems I: Regular Papers, IEEE Transactions on …
@baretta, it really depends on many variables, the age of the caps, the conditions they were stored in, the brand and type of cap the OEM manufacturer used, etc.If the original …
Our Phase Perfect systems utilize LC filtering (inductors and capacitors) to reduce noise from the switching technology. Capacitors and inductors do not dissipate or consume power. …
Capacitors are physical objects typically composed of two electrical conductors that store energy in the electric field between the conductors. Capacitors are characterized by how much charge …
Owing to the hot-standby state of the circuit breaker, the flashover accident is more likely to happen when lightning surge invades the substation or convertor station again. Measures to …
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Electrolytic Capacitors • R ESR determined by volume of electrolyte. – Dependent on …
This paper proposes a hotspot temperature estimation method based on the linear dependence between capacitance and temperature of electrolytic capacitors. For this, a set of nine samples …
This paper proposes a hotspot temperature estimation method based on the linear dependence between capacitance and temperature of electrolytic capacitors. For this, a set of nine samples …
When the hot_standby parameter is set to true on a standby server, it will begin accepting connections once the recovery has brought the system to a consistent state. …
On-chip decoupling capacitors (decaps) are widely used to reduce power supply noise by placing them at the appropriate locations on the chip between blocks. While passive …
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Electrolytic Capacitors • R ESR determined by volume of electrolyte. – Dependent on …
coupling capacitors (decaps) are typically used to reduce IR drop and Ldi/dt effects, and hence keep the power supply within a certain percentage (e.g., 10%) of the nominal supply voltage
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