能源 & Renewables

Wind farms, solar PV, oil & gas, 管道, 发电机

间谐波 - 标准谐波分析仪上不会显示的电能质量干扰

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Interharmonics — frequency components that are not integer multiples of the fundamental (例如，. 75 赫兹, 130 赫兹上 50 赫兹系统) — are produced by PV inverters, 风力涡轮机, 电动车充电器, cycloconverters, and HVDC links. Their most dangerous effect: 间谐波在 58 Hz creates an 8 Hz beat frequency — squarely in the range of peak human visual sensitivity. 现场案例: simultaneous PV + 电动车充电器 + microwave on one LV circuit produces stochastic interharmonics causing light flicker. Standard IEC 61000-4-7 analysers cannot correctly characterise them.

富含 DER 的网络中的电压不平衡 — 太阳能光伏何时有帮助，何时无帮助

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Single-phase PV panels can either worsen or improve voltage unbalance on LV feeders — depending entirely on the existing load phase distribution. UPM Madrid analysis on the IEEE European LV Test Feeder shows PV reduced mean VUF from 1.255% 至 0.702% in a medium-unbalance scenario, but increased it from 0.787% 至 0.963% in a low-unbalance scenario. Equally important: IEEE PVUR1 and PVUR2 indices can overestimate the true VUF by a factor of 10–16× in DER-rich networks — the CIGRE index is the only reliable alternative that requires only line voltage magnitudes.

光伏逆变器的次谐波发射——新兴的电能质量挑战

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Supraharmonic emissions (2–150kHz) from grid-connected PV inverters. Three emission types: narrowband at switching frequency, broadband from switching transients, time-varying with MPPT. Intermodulation between PV inverters and EV chargers creates new frequencies. No regulatory limits currently exist in this range.

惊人国际 – 发电机和非线性负载: 谐波抑制如何消除超大尺寸要求

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Mirus International demonstrates that generators feeding non-linear loads must be derated or oversized to prevent excessive voltage distortion — standard practice adds 20–25% generator capacity. The Wide Spectrum Filter (直线器) eliminates the oversizing requirement by reducing harmonic current drawn from the generator, enabling right-sized generator selection and significant capital and fuel savings.

惊人国际 – 正弦波滤波器与. 适用于长电缆 VFD 应用的 dV/dT 滤波器: 现场对比

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Long cable VFD applications produce cable resonance that amplifies dV/dt at the motor terminals — causing insulation stress and premature motor failure. A dV/dt filter limits the voltage rise rate but does not produce a true sine wave. A sinewave filter eliminates both the resonance and the harmonic content. Field comparison at San Antonio Water Authority shows measured motor terminal voltage for both filter types.

惊人国际 – 远程油井谐波控制: 以 12 脉冲成本实现优于 18 脉冲的性能

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Remote oil well site with a single-drive VFD application: multi-pulse transformer approaches were impractical at this location. Mirus Lineator passive filter achieved better than 18-pulse harmonic performance at 12-pulse cost — measured THID below 5% at the drive input. The case demonstrates that passive harmonic filters can outperform multi-pulse transformers in single-drive, isolated applications.

惊人国际 – Harmonic Mitigation for a Generator-Fed Motor Control Centre: Natural Gas Sweetening Plant

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Natural gas sweetening plant with a generator-fed motor control centre: the generator’s high source impedance amplified harmonic voltage distortion from VFD loads to levels that caused control system malfunctions. Mirus filter selection had to account for the generator impedance characteristics rather than infinite bus assumptions — a common oversight in generator-fed harmonic filter design.

惊人国际 – 谐波抑制和发电机调整 – 管道泵站案例研究

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Pipeline pumping station with generator-fed VFDs: harmonic current from the drives caused the generator to be significantly oversized — adding capital cost and reducing fuel efficiency. Mirus sinewave filter reduced harmonic current to allow generator rightsizing, improving fuel efficiency and reducing the generator procurement cost. Field results show measured harmonic distortion and generator loading before and after.

惊人国际 – 用于 ESP 电机保护的正弦波滤波器: 滤波器设计和电机热响应的现场案例研究

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Submersible ESP (Electric Submersible Pump) motors fed via VFDs through long cables: sinewave filter design must account for the cable capacitance, motor inductance, and the filter’s own resonant frequency. Incorrect filter design can produce resonance at a harmonic frequency, amplifying distortion rather than reducing it. Case documents the filter design process and measured thermal response of the motor under harmonic loading.

风力发电更可靠 (可靠的电力公司)

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一 27 MW wind farm in Newfoundland — nine 3 MW turbines — requires reliable substation control and protection power to safely detect faults and isolate them. A UPS was installed in the substation to maintain protection system availability during grid disturbances, preventing loss of the entire wind farm on a grid fault.

静止式变流器和电能质量

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Laboratory measurements on a 2.2 kW adjustable speed drive subjected to controlled voltage dips of varying magnitude and duration. The ASD’s DC bus capacitors and ride-through capability are characterised — showing the boundary between ride-through and trip as a function of sag depth and duration. Provides the experimental basis for ASD immunity specification in sensitive industrial applications.

分布式发电和电能质量

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Belgian MV distribution network segment used to study the impact of distributed generation technologies (风, 光伏, CHP) on power quality and voltage stability. Four cable feeders from a 14 MVA 70/10 kV transformer. Analysis shows how DG penetration affects voltage profiles, harmonic injection, and voltage stability — with practical implications for network planning with high DG penetration.

风力发电 (HIOKI)

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Wind power generation creates unique PQ challenges: output voltage fluctuates with wind speed, frequency deviates from nominal, transient overvoltages occur from lightning and grid switching, and inrush current and harmonics accompany inverter operation. Simultaneous measurement of all parameters is essential for grid interconnection compliance assessment.

太阳能发电 (HIOKI)

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Solar PV power conditioners maintain output by monitoring grid voltage and frequency — but malfunction when grid voltage rises above threshold or frequency deviates. Problems include inverter trips, inability to sell back power due to overvoltage, and high-order harmonic injection from neighbouring PV systems. Field measurement identifies the dominant disturbance type.

风力发电的电能质量 & 互连问题 (Dranetz)

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Wind generation plant interconnection requires assessment of harmonics, 闪烁, 电压波动, frequency deviation, and fault ride-through capability. Dranetz monitoring solutions cover both temporary commissioning assessment and permanent 24/7 monitoring for continuous interconnection compliance verification on wind farms of any size.

液体和气体泵/管道应用 (美国超导公司)

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Pipeline pump stations are moving to larger motors — 4160V in the 2,000–4,000 HP range, 15kV-class at 8,000–15,000 HP — creating significant flicker, 谐波, and reactive power management challenges. American Superconductor’s PQ-SVC system provides dynamic reactive compensation enabling larger motor sizes at existing substations without requiring substation upgrades.

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