1.5 governance effect
After using two sets of active power filter devices for treatment in the 4th and 5th segments of the 10kV bus , the system harmonics are well suppressed, and the 11th and 13th harmonics are completely limited to the national standard. The reliability of the system's power supply eliminates the hidden dangers of system harmonics on the power grid system, and has received good results to improve the power quality of the grid.
Wiring | Three-phase three-wire or three-phase four-wire | |||
Access voltage | 3 × 380V ± 10% | |||
Access frequency | 50Hz ± 2% | |||
Dynamic compensation response time | Dynamic response < 4ms , full response time < 20ms ; | |||
On-off level | 10kHz | |||
Function setting | Only compensate harmonics, only compensate for reactive power, compensate for harmonics and compensate for reactive power; manual and automatic switching. | |||
Harmonic compensation times | 2-21 times | |||
Type of protection | DC overvoltage IGBT overcurrent device temperature protection | |||
Overload protection | Automatic current limit at set value, no overload occurs | |||
cooling method | Intelligent air cooling | |||
noise | < 65db ( in the cabinet and operating in rated state ) | |||
Working temperature | -10 °C ~ +45 °C | |||
Working environment humidity | < 85% RH does not condense | |||
Installation occasion | Indoor installation | |||
Altitude | ≤ 1000m (higher altitude needs derating) | |||
In and out line | Down and down | |||
Protection level | IP21 | |||
Intelligent communication interface | RS485/MODBUS-RTU | |||
Remote monitoring | Optional | |||
Dimensions (mm) (W × D × H) | 30A | 50A | 75A | 100A |
600 × 500 × 1500 | 600 × 500 × 1500 | 600 × 500 × 1800 | 800 × 600 × 2200 | |
Weight (kg) | Three-phase four-wire | Three-phase three-wire | ||
30A , 50A | 75A , 100A | 30A , 50A | 75A , 100A | |
280 | 360 | 240 | 290 | |
Description: 1. The compensation current can be determined by the measured data, or the compensation current can be calculated through detailed information of the power system (single line diagram, transformer, load condition, etc.); 2 , three-wire system needs to configure 2 or 3 CT (for phase A and phase C ), four-wire system needs to configure 3 CT (for phase A, phase B and phase C ). | ||||
2.2 ANAPF active filter quotation and component list
3 Parallel ANAPF application advantages 1) Filtering harmonics ANAPF has wide filtering range, high filtering efficiency and filtering rate of over 92%: passive filtering equipment uses compensation capacity to set LC filtering branch for fixed subharmonics. The subharmonic filtering effect is poor; the harmonic components of the system are very complicated, and the system power factor is already high. The fundamental compensation capacity is too small, and it is impossible to set a specific LC filter branch to ensure that each filter rate meets the requirements. In particular, the second harmonic content of the system is large, and according to the principle of the LC filter branch, the second harmonic impedance is almost the same as the fundamental wave, and the filtering rate is extremely low.
2) Prevent harmonic amplification, suppress resonance function ANAPF has no energy storage original, is not affected by system parameters and design parameters, and will not resonate with the system; passive filtering equipment, setting high-order filter branch will be Low-order harmonic amplification, and the 2~13th harmonic content of the system is large. The set filter branch is easy to amplify other sub-harmonics; the system parameters and design parameters are inconsistent or changeable, and the system exists. The risk of resonance.
3) Other ANAPF response time is less than 10ms, delay time is less than 100us; reactive power compensation is programmable, it can be compensatory reactive power, and can also compensate for inductive reactive power; strong load capacity, automatic current limiting, no overload, use High life; small size, easy to install; passive filter device with slow dynamic response; only compensable reactive; limited to LC device characteristics, LC parameters may change after long-term operation; large volume, debugging is more complicated.
4 Conclusions 1) The modular parallel active filter device designed in this paper is a new type of filter compensation device that can be used in low-voltage power distribution systems. The device itself can compensate the high-order harmonics and the fundamental reactive power of the system at the same time, has high adaptability, high filtering precision and good compensation effect.
2) The device has various protection functions, which can suppress parallel or series resonance caused by system parameter changes, and can also prevent reactive over-compensation.
3) Based on the original capacitor reactive power compensation device of the enterprise, the filter and reactive power hybrid compensation system composed of capacitor and active filter device is designed to save the user's investment cost and shorten the construction period. The harmonic control project of the distribution network provides an efficient compensation device with good application value and application prospects.
4) The expansion of the unit capacity of the active filter device module and the further improvement of the voltage level can be used as the direction of future research.
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